CN103511410B

CN103511410B - Fastener and manufacture method thereof

Info

Publication number: CN103511410B
Application number: CN201310049742.9A
Authority: CN
Inventors: 周立新
Original assignee: Individual
Current assignee: Hebei Lixin Technology Co Ltd
Priority date: 2012-11-22
Filing date: 2013-02-07
Publication date: 2015-12-30
Anticipated expiration: 2033-02-07
Also published as: CN203285043U; CN103511410A

Abstract

The present invention discloses a kind of fastener for gripping objects, comprise the first jig arm and the second jig arm, the first end of the first jig arm and the first end of the second jig arm are rotatably connected each other by rotatable connection, the cavity being used for holding this object when gripping objects is formed between the first and second jig arm, wherein, this rotatable connection comprises bearing pin and this bearing pin and around the rotatable winder of this bearing pin of reeling, this winder to be connected with one of first and second jig arm or as its part using its first end, this bearing pin is connected with another in described first and second jig arm or as its part, and the second end of this winder is arranged in described cavity and when this fastener gripping objects and this object rubbing contact.The invention also discloses the manufacture method of fastener.In addition, the invention also discloses a kind of self-locking device, this self-locking device can be used in fastener of the present invention.

Description

Fastener and method of manufacturing the same

Technical Field

The invention relates to the technical field of fastening devices, in particular to a fastener for clamping an object and a manufacturing method of the fastener. Such as a construction fastener for building a scaffold.

Background

Fasteners are used as a fastening device for fastening in a wide variety of applications, such as in the construction field for building scaffolding. In the prior art, the fastener generally comprises a cover and a base (hereinafter also referred to collectively as "clip arms") between which a rotatable connection is formed by a pin.

Existing fasteners typically include cast fasteners as well as hot forged fasteners.

In the fastener made by casting, the through hole for the pin shaft to pass through on the cover plate and the through hole for the pin shaft to pass through on the base are both formed by a perforation process. Such fasteners are generally made by casting malleable steel, the cover and base being cast one by means of a mould and perforated after annealing of the cover and base to form a through hole for the pin to pass through, as shown in chinese patent application CN 1629420A. However, because the fastener adopts a casting process, the raw materials need to be subjected to various processes such as heating, injection molding, annealing and the like, so that the energy consumption is high, the requirement on processing equipment is high, the processing period is long, the overall production cost is high, and the environmental pollution is easily caused. In addition, because the fastener is mainly made of malleable iron or cast iron which has high carbon content, the toughness is poor, the compressive strength is not high enough, and safety accidents are easily caused; in order to further increase the compressive strength, the sizes of the cover plate, the base and the edge of the through hole have to be increased, so that the material consumption of the fastener is increased and the weight is heavy.

In a steel fastener formed by hot forging, a steel plate is generally used as a raw material. In order to form the through holes for the pin shafts to pass through to form the rotatable connection, the cover plate and the base must be hot forged at high temperature to form large flat portions for the through holes, and the edges of the through holes formed after the through holes are wide enough to achieve sufficient connection strength. In such a fastener, the cost of the hot forging process is higher than that of a cast fastener because of the high requirements on processing equipment (for example, the processing equipment such as a die is required to have high temperature resistance), and the material consumption of the fastener is high.

Steel plate fasteners have also been proposed in the prior art as shown in chinese patent application CN 102322464A. However, the existing steel plate fastener is complex to process, heavy in weight, and many in production links, so that the production speed is low, and particularly the strength is not high. Because the fastener uses the triangular flat central plate, the binding surface of the fastener and the clamped object is not large enough, so that the friction force between the fastener and the clamped object is limited, and the antiskid effect is general; and the rotary connection part between the cover plate and the base is easy to loosen in use.

A common disadvantage of prior art fasteners, including the above fasteners, is their low fastening strength, which is mainly caused by the insufficient strength of the pin connection between the cover and the base, which only relies on its own structural strength and force to provide the required fastening strength. In order to further improve the strength of the fastener, the thicknesses of the cover plate, the base and the pin shaft connecting part need to be increased, so that the material usage amount of the fastener is increased, and the cost and the weight of the fastener are increased.

The safety performance of the traditional steel fastener is slightly good, but the production cost is overhigh due to the adoption of the processes of hot forging, hollowing, assembling and the like, the manufacturing cost is 1-2 times higher than that of the traditional casting fastener (such as a malleable steel fastener), and the traditional steel fastener is hardly used in the Chinese market.

Furthermore, in conventional fasteners, the live (or swivel) connection between the clip arms is a weak link, which is often unrecoverable once deformed or damaged, and the fastener is immediately damaged, resulting in reduced fastener safety.

Disclosure of Invention

To solve the above technical problems, according to a first aspect of the present invention, there is provided a clip for clamping an object, the clip comprising a first clip arm and a second clip arm, a first end of the first clip arm and a first end of the second clip arm being rotatably connected to each other by a rotatable connection mechanism, a cavity for receiving the object when clamping the object being formed between the first and second clip arms, wherein the rotatable connection mechanism comprises a pin and a winding portion which is rotatable around the pin by winding the pin, the winding portion being connected at its first end to or being a part of one of the first and second clip arms, the pin being connected to or being a part of the other of the first and second clip arms, and a second end of the winding portion being located in the cavity and being in frictional contact with the object when the clip clamps the object.

Preferably, in order to increase the rotational flexibility and the security of the rotatable connection, a cylindrical bushing is provided between the pin and the winding, i.e. a cylindrical bushing is provided around the pin and the winding is wound around the bushing. More preferably, the bushing has a longitudinal slit so that the bushing can contract when compressed to grip an object located within it.

The second end of the winding part can be welded with the winding part after the pin shaft is wound so as to increase firmness; but it may also be left unwelded so that there is sufficient clearance between the second end of the wrap and the wrap itself to enable the second end to elastically deform and grip the pin when squeezed by a gripped object, making the second end difficult to slip, and this may also reduce machining complexity and cost.

It should be noted that two objects "connected" in the present invention may mean that the two objects are directly connected or indirectly connected through a third party.

According to a second aspect of the invention, in the fastener of the first aspect of the invention, the first end of the first clamping arm is provided with at least one through hole communicated with the cavity, and the edge of the through hole forms the pin shaft; the first end of the second clip arm has at least one extension portion which constitutes the winding portion and which is wound around the edge of the through hole through the through hole towards the cavity so as to form the rotatable connection, wherein the distal end of the extension portion (i.e. the second end of the winding portion) is located within the cavity and is in frictional contact with the object when the fastener is gripping the object. Preferably, the rim is a thickened portion, preferably cylindrical; and/or the tail end of the extension part is matched with the clamped object in shape.

According to a third aspect of the present invention, the fastener of the first aspect of the present invention further comprises a connecting buckle, the connecting buckle constitutes the winding portion, the first end of the first clamping arm and the first end of the second clamping arm respectively have at least one first through hole communicating with the cavity and at least one second through hole communicating with the cavity, the edge of the first through hole constitutes the pin, one end of the connecting buckle passes through the first through hole towards the cavity direction and winds around the edge of the first through hole, so as to form the rotatable connection, and the other end of the connecting buckle passes through the second through hole towards the cavity direction and winds around the edge of the second through hole, wherein the ends of the two ends of the connecting buckle are located in the cavity and are in frictional contact with the object when the fastener clamps the object.

Preferably, the rim of the first and/or second through hole is cylindrical; more preferably, the rim of the first through-hole or the second through-hole is flat.

According to a fourth aspect of the present invention, the fastener of the first aspect of the present invention further includes a connecting buckle, the connecting buckle constitutes the winding portion, the first end of the first clamping arm and the first end of the second clamping arm respectively have at least one first through hole communicated with the cavity and at least one second through hole communicated with the cavity, the edge of the first through hole constitutes the pin, one end of the connecting buckle penetrates the first through hole towards the cavity direction and winds the edge of the first through hole, so as to form the rotatable connection, and the other end of the connecting buckle penetrates the second through hole along the direction departing from the cavity and is attached to the edge of the second through hole, and preferably, the attached portion is welded, so as to form the non-rotatable movable connecting structure.

In the above fastener, it is preferable that the edge is of a thickened design, such as a cylindrical shape, a hexagonal prism shape, or the like, so that the tensile strength of the edge can be increased.

According to a fifth aspect of the present invention, in the clip of the first aspect of the present invention, the first end of the first clip arm has at least one first extension portion which constitutes the winding portion and which winds around the pin toward the cavity so as to form the rotatable connection, and the first end of the second clip arm has at least one second extension portion which winds around the pin toward the cavity, wherein the ends of the first and second extension portions are located in the cavity and are in frictional contact with the object when the clip grips the object.

According to a sixth aspect of the invention, in the fastener of the first aspect of the invention, comprising a clasp, the side edge of which constitutes the pin, the first end of the first clip arm having at least one first extension part, which constitutes the winding part and which, towards the cavity direction, penetrates through the central hole of the clasp to wind the side edge of the clasp, thereby forming a rotatable connection; the first end of the second clamping arm is provided with at least one second extension part, and the second extension part penetrates through the central hole of the buckle towards the cavity direction and winds the other part of the side edge of the buckle; wherein the ends of the first and second extensions are located in the cavity and frictionally contact the object when the fastener clamps the object. Preferably, the buckle is a closed or non-closed square ring formed by connecting the strips end to end, and the end to end part of the buckle is wound by the first or second extension part.

Preferably, the clamping arm with the winding part is formed by bending a strip, and two ends of the strip wind the pin shaft side by side to jointly form the extension part.

Preferably, the clamping arm with the through hole is formed by a closed or non-closed ring formed by connecting the strip-shaped objects end to end, and the connecting position of the end to end is located at the first end of the clamping arm where the clamping arm is located or the opposite end of the first end.

In the above fastener, preferably, the second end of the winding portion (e.g., the end of the extension portion) is form-fitted to the clamped object. For example, if the clamped object is cylindrical, the surface of the end of the extension part facing the clamped object is cylindrical and completely fits the cylindrical clamped object, so that the contact area is increased, and the friction force is increased, and the tensile strength and the safety are improved.

In the above fastener, preferably, the second end of the first clip arm and the second end of the second clip arm each have a slit or a seamless notch for a bolt (e.g., a t-bolt) to pass through to fix the second ends of the first clip arm and the second clip arm to each other. The clamping arms preferably have a shape and configuration that closely conforms to the object being clamped.

In the above fastener, the second end of the first clamping arm may have a first buckle and a through hole communicating with the cavity, one end of the first buckle has a notch or a seamless notch for allowing a bolt to pass through for engagement, and an opposite end of the first buckle passes through the through hole of the second end of the first clamping arm towards the cavity and is wound around the edge of the through hole to form a rotatable connection, and a distal end of the opposite end is located in the cavity and is in frictional contact with an object when the fastener clamps the object; and/or the second end of the second clamping arm is provided with a second buckle and a through hole communicated with the cavity, one end of the second buckle is provided with a notch or a seamless notch for a bolt to pass through for clamping, the opposite end of the second buckle passes through the through hole of the second end of the second clamping arm towards the cavity direction and is wound around the edge of the through hole to form a rotatable connection, and the tail end of the opposite end of the second buckle is positioned in the cavity and is in frictional contact with an object when the fastener clamps the object.

In the above fastener, the second end of one of the first and second clip arms may have a notch or a seamless notch for allowing one end of a bolt to pass therethrough for engagement, or a first buckle having a notch or a seamless notch at one end for allowing a bolt to pass therethrough for engagement, and a through hole communicating with the cavity, and an opposite end of the first buckle passing through the through hole of the second end of one of the first and second clip arms toward the cavity and being wound around an edge of the through hole to form a rotatable connection, the opposite end being located in the cavity and being in frictional contact with an object when the fastener clamps the object; the second end of the other one of the first clamping arm and the second clamping arm is provided with a through hole communicated with the cavity, the tail end of the other end of the bolt penetrates through the through hole of the second end of the other one towards the cavity and is wound around the edge of the through hole to form rotatable connection, and the tail end of the other end of the bolt is located in the cavity and is in frictional contact with an object when the fastener clamps the object.

In the above fastenerPreferably, the second end of one of the first clamping arm and the second clamping arm is provided with a self-locking device, the self-locking device comprises a self-locking base, a self-locking rod, a first locking block and a second locking block, the self-locking base is provided with a cavity, and the side wall of the cavity comprises a first friction contact surface and a fourth friction contact surface; the self-locking rod is provided with a second friction contact surface and a third friction contact surface, and can extend into the cavity of the self-locking base so that the second friction contact surface faces the first friction contact surface, the third friction contact surface faces the fourth friction contact surface, the first locking block is positioned between the first friction contact surface and the second friction contact surface and is in contact with the first friction contact surface and the second friction contact surface, and the second locking block is positioned between the third friction contact surface and the fourth friction contact surface and is in contact with the third friction contact surface and the fourth friction contact surface; the included angle between the first friction contact surface and the second friction contact surface is alpha, the included angle between the third friction contact surface and the fourth friction contact surface is alpha', and the friction angles of the first lock block relative to the first friction contact surface and the second friction contact surface are respectively alphaAndthe friction angles of the second locking block relative to the third and fourth friction contact surfaces are respectivelyAndwherein,and isOne end of the self-locking rod can be occluded with the second end of the other one of the first clamping arm and the second clamping arm, and preferably, the second end of the other one is provided with a lapThe buckle is provided with a notch at one end for being occluded with one end of the self-locking rod, the opposite end of the buckle penetrates through the through hole of the second end of the other end towards the direction of the cavity for accommodating the clamped object and is wound around the edge of the through hole to form rotatable connection, and the tail end of the opposite end is positioned in the cavity for accommodating the clamped object and is in frictional contact with the object when the fastener clamps the object.

Preferably, the second end of said one of the first and second clip arms is integrally formed with the self-locking base; or, the second end of the one of the first clamping arm and the second clamping arm is provided with a through hole communicated with the cavity for accommodating the clamped object, the side surface of the self-locking base is provided with a protruding lug part, the tail end of the lug part penetrates through the through hole of the second end of the one towards the cavity for accommodating the clamped object and is wound around the edge of the through hole to form a rotatable connection, and the tail end of the lug part is positioned in the cavity for accommodating the clamped object and is in frictional contact with the object when the fastener clamps the object.

Preferably, the end of at least one of the first and second locking pieces is outside the cavity and has a flange.

Preferably, 0 < α ≦ 17 ° and/or 0 < α' ≦ 17 °.

Preferably, the first friction contact surface and the fourth friction contact surface are symmetrically arranged relative to the longitudinal axis of the self-locking base, and the second friction contact surface and the third friction contact surface are symmetrically arranged relative to the longitudinal axis of the self-locking rod, so that α ═ α'.

Preferably, the first and second locking pieces are slidable along the first and fourth frictional contact surfaces, respectively; more preferably, the inner wall of the self-locking base is provided with at least one first sliding groove or rib for the first locking piece and at least one second sliding groove or rib for the second locking piece, the first locking piece is provided with a protrusion or sliding groove matched with the first sliding groove or rib in shape, and the second locking piece is provided with a protrusion or sliding groove matched with the second sliding groove or rib in shape.

The fastener of the invention can also comprise at least one elastic component, one end of the elastic component is positioned on the self-locking base, and the other end of the elastic component is positioned on the locking block and is used for keeping the locking block in contact with the self-locking rod; or, at least one first elastic part and at least one second elastic part are arranged in the cavity of the self-locking base, one end of the first elastic part is positioned on the inner wall of the self-locking base, the other end of the first elastic part is positioned on the first locking block and used for keeping the first locking block and not enabling the first locking block to be separated from the cavity, one end of the second elastic part is positioned on the inner wall of the self-locking base, and the other end of the second elastic part is positioned on the second locking block and used for keeping the second locking block and not enabling the second locking block to be separated from the cavity.

Preferably, an intermediate portion between the first and second ends of the first and/or second clip arms has at least one opening communicating with the fastener cavity; preferably, the opening of the intermediate portion is in communication with the through-hole and/or the slit or notch.

The fastener can be a fastener for a building, the first clamping arm is a cover plate, and the second clamping arm is a base; or, the fastener is for the building fastener, first arm lock is the base and the second arm lock is the apron.

According to another aspect of the present invention, there is also provided a rotational fastener including: the fastener comprises a first fastener and a second fastener, wherein a first clamping arm or a second clamping arm of the first fastener and a first clamping arm or a second clamping arm of the second fastener are rotatably connected to form a rotating seat of the rotating fastener. Preferably, the two arms constituting the rotary base are rotatable in a plane perpendicular to the plane of rotation of the first and second arms of the first clip.

According to another aspect of the present invention, there is also provided a right-angle fastener including: the first clip arm or the second clip arm of the first clip is fixedly connected with the first clip arm or the second clip arm of the second clip to form a right-angle seat of the right-angle clip, and the respective rotation planes of the two clip arms forming the right-angle seat are perpendicular to each other. Preferably, each of the clamping arms constituting the right-angle seat is constituted by a pair of halves arranged opposite each other to constitute a non-closed loop, the two pairs of halves crossing each other and being fixed at the crossing, preferably by welding.

According to another aspect of the present invention there is also provided a method for manufacturing a fastener, comprising:

rolling the steel blank into a first clamp arm profile having a plurality of said fastener first clamp arm preforms;

cutting the first clamping arm section bar to form a plurality of first clamping arm prefabricated parts;

forming a through hole at a first end of the first clamping arm prefabricated part through punching, and forming a notch or a seamless notch at a second end of the first clamping arm prefabricated part so as to form a first clamping arm;

rolling the steel blank into a second clamping arm profile with a plurality of fastener second clamping arm prefabricated parts;

cutting the second clamping arm section bar to form a plurality of second clamping arm prefabricated parts;

forming a second clamp arm by forming a gap or seamless notch in a second end of the second clamp arm preform through a perforation;

and the extending part of the second clamping arm penetrates through the through hole of the first clamping arm towards the direction of the fastener cavity and is wound on the edge of the through hole.

forming a through hole at a first end of the second clamping arm prefabricated part through punching, and forming a notch or a seamless notch at a second end of the second clamping arm prefabricated part so as to form a second clamping arm;

cutting the steel plate to form a connecting buckle;

and respectively enabling two ends of the connecting buckle to penetrate through the first through hole and the second through hole on the first clamping arm and the second clamping arm towards the cavity direction of the fastener so as to wind the edges of the first through hole and the second through hole.

forming a first clip arm by forming a gap or seamless notch in the second end of the first clip arm preform through a perforation;

preparing a pin shaft;

and winding the extension part of the first clamping arm of the fastener towards the cavity direction of the fastener to form the pin shaft, and winding the extension part of the second clamping arm of the fastener towards the cavity direction of the fastener to form the pin shaft.

a) bending a steel bar into a U shape, shaping and stamping to form a first clamping arm and a second clamping arm which respectively comprise two symmetrical supporting legs and a connecting part for connecting the two supporting legs; step b) manufacturing a strip-shaped steel bar as a first connecting buckle; and c) winding the two ends of the connecting buckle around the connecting part of the first clamping arm and the connecting part of the second clamping arm, so that the two ends of the connecting buckle are positioned in the cavity formed by the first clamping arm and the second clamping arm and are contacted with the clamped object when the fastener clamps the object.

In the rotatable connection structure of the fastener of the invention, the tail end of the clamping arm extension part is arranged in the cavity of the fastener and is in friction contact with the clamped object. By the structure, steel materials (such as Q195 steel, Q235 steel, ML08 steel, ML15 steel, 35K steel, 45#.20MnTiB.40Cr and the like) can be adopted as the material for forming the clamping arms, and the toughness and the rigidity of the material are stronger than those of the traditional malleable steel material; the process of forming the rotatable connection by winding the extension part is convenient, and the process of forming the hinge joint by the traditional malleable steel fastener through casting, annealing and perforation is omitted; in addition, the tail end of the extension part is arranged in the cavity, when the first clamping arm and the second clamping arm clamp an object, the tail end of the extension part is in friction contact with the clamped object, so that the tail end does not move relative to the clamped object due to the increase of clamping force, the clamping effect of the fastener is enhanced by skillfully utilizing the acting force between the fastener and the clamped object, the technical characteristics which are not thought in the traditional fastener are not provided, the tail end of the extension part and the second clamping arm do not need to be welded to form a closed ring structure, and the fastener processing technology is simplified while the connection strength between the clamping arms is improved. Compare with traditional steel sheet fastener, intensity has obtained very big promotion.

Because the structure enables the adoption of steel with higher strength and better toughness, the limit of the traditional malleable steel is broken away, and redundant parts in the structure of the traditional fastener are eliminated, so that the material of the fastener is saved, the weight is lighter, and the cost is lower. Moreover, the dead weight of the fastener is lighter, so that the load of the fastener on application occasions in use is lighter, for example, when a scaffold is built, the dead weight of the formed scaffold is lighter, the bearing capacity of the scaffold is further improved, and the safety is improved.

In addition, the fastener adopts steel suitable for cutting, the overall shape of the clamping arm can be a belt shape, and a billet is cold-pressed (rolled) to form a strip-shaped clamping arm section, and the section is subjected to processes of cutting, punching and the like, so that the processing of each part of the formed fastener is simpler and more economical.

Because the steel plate is adopted for cold press molding, the energy consumption is low and no pollution is caused in the production process.

Under the condition of forming the fastener clamping arm by cold pressing the reinforcing steel bar, the clamping arm can be formed only by bending the reinforcing steel bar into an approximate U shape for cold pressing, so that the processing process is further greatly simplified, and the processing cost is reduced.

The invention also provides a self-locking device, which comprises a self-locking base, a self-locking rod, a first locking block and a second locking block, wherein the self-locking base is provided with a cavity, and the side wall of the cavity comprises a first friction contact surface and a fourth friction contact surface; the self-locking rod is provided with a second friction contact surface and a third friction contact surface, and can extend into the cavity of the self-locking base so that the second friction contact surface faces the first friction contact surface, the third friction contact surface faces the fourth friction contact surface, the first locking block can be movably arranged between the first friction contact surface and the second friction contact surface and is contacted with the first friction contact surface and the second friction contact surface, and the second locking block can be movably arranged between the third friction contact surface and the fourth friction contact surface and is contacted with the third friction contact surface and the fourth friction contact surface; and the first and second frictional contactsThe included angle between the surfaces is alpha, the included angle between the third friction contact surface and the fourth friction contact surface is alpha', and the friction angles of the first lock block relative to the first friction contact surface and the second friction contact surface are respectively alphaAndthe friction angles of the second locking block relative to the third and fourth friction contact surfaces are respectivelyAndwherein,and isPreferably, the end of at least one of the first and second locking pieces is outside the cavity and has a flange; more preferably, 0 < α ≦ 17 °, and/or 0 < α' ≦ 17 °; more preferably, the first friction contact surface and the fourth friction contact surface are symmetrically arranged relative to the longitudinal axis of the self-locking base, and the second friction contact surface and the third friction contact surface are symmetrically arranged relative to the longitudinal axis of the self-locking rod, so that α ═ α'.

The invention also provides a right-angled seat for a right-angled fastener, comprising two clip arms fixed perpendicularly to each other, each clip arm being formed by a pair of halves (i.e. two halves) arranged opposite each other to form a non-closed loop. The two halves cross each other and are fixed at the crossing, in particular by welding. Preferably, the two halves are formed by stamping to a desired shape that matches the shape of the intended clamped object. The halves may have various shapes as desired, such as round brackets, middle brackets, and the like.

Compared with the prior art, the invention has remarkable advantages, for example, the fastener does not need hot forging in the manufacturing process, and can effectively reduce energy consumption; the fastener can adopt various steels with higher strength, and the strength of the fastener is increased by several times compared with the strength of the traditional casting fastener; the rotatable connecting mechanism and the hasp of the fastener of the invention fully utilize the frictional contact with the clamped object, the strength of the rotatable connecting mechanism and the hasp is obviously improved, and the processing cost of the fastener is greatly simplified by decomposing the fastener into simple and easily processed components.

Drawings

The invention is further described below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention and not to limit the present invention. In the drawings:

FIGS. 1A-1B are schematic perspective views of a fastener according to a first embodiment of the invention;

FIG. 1C is a front view of a fastener according to a first embodiment of the invention;

FIGS. 2A-2B are schematic perspective views of a fastener according to a second embodiment of the invention;

FIG. 2C is a front view of a fastener according to a second embodiment of the invention;

FIGS. 2D and 2E show a schematic perspective view and a front view, respectively, of a fastener according to a third embodiment of the invention;

FIGS. 2F, 2G, 2H show a schematic front view, a left side view and a cross-sectional view A-A of FIG. 2G, respectively, of a fastener according to a fourth embodiment of the invention;

3A-3B are schematic perspective views of a fastener according to a fifth embodiment of the invention;

FIG. 3C is a front view of a fastener according to a fifth embodiment of the invention;

3D-3E show a schematic perspective view and a front view, respectively, of a fastener according to a sixth embodiment of the invention;

FIGS. 3F-3G show a perspective view and a front view, respectively, of a rotational fastener constructed using the fastener of FIG. 3D as a sub-fastener;

FIG. 4A is a self-locking schematic view of a first embodiment of the self-locking device for use in the fastener of the present invention;

FIG. 4B is a force triangle diagram according to the self-locking principle of the first embodiment of the self-locking device used in the fastener of the present invention;

FIGS. 4C and 4D are the structural and self-locking schematic views of the second and third embodiments of the self-locking device in the fastener of the present invention, respectively;

FIG. 5A is a schematic perspective view of a fastener according to a seventh embodiment of the invention;

FIG. 5B is a schematic front view of a fastener according to a seventh embodiment of the invention;

FIG. 5C is a cross-sectional view B-B of FIG. 5D; FIG. 5D is a cross-sectional view A-A of FIG. 5C;

FIGS. 5E-5G are perspective, front and side views, respectively, of a fastener according to an eighth embodiment of the invention;

FIGS. 5H-5I illustrate a right-angle fastener and a rotational fastener, respectively, constructed using the fastener of FIGS. 5E-5G as a sub-fastener;

FIGS. 6A-6B are perspective views of a self-locking device according to a ninth embodiment of the present invention;

FIG. 6C is a side view of a self-locking device according to a ninth embodiment of the present invention;

FIGS. 6D-6E are a sectional view A-A and a sectional view B-B of a self-locking device according to a ninth embodiment of the present invention;

fig. 6F is a schematic view illustrating a modification of the self-locking device according to the ninth embodiment of the present invention;

7A-7B illustrate one example of a rotational fastener of the present invention;

FIG. 8A shows a schematic perspective view of one example of a right angle fastener of the present invention;

8B-8C show schematic side views of one example of a right angle fastener of the present invention;

figures 9A-9B illustrate the rolling of a steel blank into a clip arm profile comprising a plurality of clip arm preforms;

9C-9D show a schematic illustration of a cutting line for a clip arm profile comprising two columns of clip arm preforms arranged side by side, the two columns being staggered so that the extensions of the two columns of clip arm preforms for forming the coil holes (and further for forming the rotatable connection) are arranged next to each other;

9E-9G illustrate a single clip arm preform being cut;

9H, 9I, 9J show clip arms formed with notches by a piercing process and extensions of the clip arms extruded to form coil holes;

10A-10C show schematic perspective views of another example of a right angle fastener according to an embodiment of the invention;

FIGS. 10D-10E illustrate a side view and a cross-sectional A-A view, respectively, of another example of a right angle fastener in accordance with an embodiment of the present invention;

FIG. 11A shows a schematic perspective view of yet another example of a right angle fastener in accordance with an embodiment of the invention;

11B-11C illustrate side views of yet another example of a right angle fastener according to an embodiment of the present invention;

12A-12B show schematic perspective views of yet another example of a right angle fastener in accordance with an embodiment of the invention;

FIG. 12C shows a top view of yet another example of a right angle fastener in accordance with an embodiment of the present invention;

12D-12E illustrate side views of yet another example of a right angle fastener according to an embodiment of the present invention;

13A-13C show perspective, front and side views of a fastener according to a tenth embodiment of the invention;

FIG. 13D shows a perspective view of a fastener according to an eleventh embodiment of the invention;

13E-13G illustrate a top view, A-A cross-sectional view, and a perspective view of yet another example of a right angle fastener in accordance with an embodiment of the present invention;

FIGS. 13H-13I show a perspective view and a front view of a fastener used in the fastener of the invention, and FIG. 13J shows a front view of the fastener profile before bending;

14A-14B show top and front views of a right angle block used in the fastener of the present invention, the two clamping arms of which may be further stamped into different shapes as desired;

14C-14D show top and front views of another example of a right angle receptacle for use in the fastener of the present invention;

14E-14F show perspective and top views of another example of a right angle mount;

14G-14I illustrate right angle seats that have been further stamped to facilitate gripping of cylindrical objects;

15A-15B show perspective and front views of a fastener according to a twelfth embodiment of the invention; and is

FIG. 15C shows another example of a right angle fastener of an embodiment of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the case of conflict, the features in the embodiments of the present application may be combined with or replaced by each other.

The present invention provides a clip for gripping an object, the clip comprising a first clip arm and a second clip arm, a first end of the first clip arm and a first end of the second clip arm being rotatably connected to one another by a rotatable connection, a cavity being formed between the first and second clip arms for receiving the object when gripping the object, wherein the rotatable connection comprises a pin and a winding portion wound around the pin so as to be rotatable about the pin, the winding portion being connected at its first end to or being part of one of the first and second clip arms, the pin being connected to or being part of the other of the first and second clip arms, and a second end of the winding portion being located in the cavity and being in frictional contact with the object when the clip is gripping the object.

The second end of the winding part can be welded with the winding part after the pin shaft is wound so as to increase firmness; but welding may be eliminated to reduce processing complexity and cost.

A fastener according to a first embodiment of the present invention will now be described with reference to figures 1A-1C. As shown in fig. 1A-1C, the fastener 104 for clamping an object of the present embodiment includes a clamping arm 105 and a clamping arm 106, a first end 107 of the clamping arm 105 is rotatably connected to a first end 108 of the clamping arm 106, and a cavity 111 for accommodating the object when clamping the object is formed between the clamping arms 105 and 106. The first end 107 of the clamping arm 105 has at least one through-opening communicating with the cavity 111, the first end 108 of the clamping arm 106 has at least one extension 110, the extension 110 constitutes said winding and is wound around a rim 109 of the through-opening towards the cavity 111, the rim 109 constitutes said pin, thereby forming said rotatable connection, the end of the extension 110 being located in the cavity 111 and being in frictional contact with the object when the clamp 104 is clamping the object.

Preferably, the rim 109 is a thickened portion to increase the strength of the rotatable connection of the fastener, and is preferably cylindrical to facilitate mobility of the rotatable connection formed. This edge 109 is adjacent to the clip arm 106.

In addition, the extension tip can be made larger in size as needed to increase the friction area with the clamped object, strength and safety.

The second ends 112, 113 of the clamp arms 105 and 106 may each have a slit or seamless slot for a bolt or other locking device to pass through to secure the second ends 112, 113 of the clamp arms 105, 106 to one another. However, where a loop fastener is used to lock the second ends 112, 113 of the clamping arms 105, 106, a gap or seamless notch may not be required, as may be the case with the fasteners of the embodiments described below.

The clip arm extensions and clip arm bodies in this embodiment may also be separate components that are joined to one another by overlapping, welding, snapping, rotatable connection, or the like.

In the case of the clip of this embodiment being a swivel clip with another clip, the intermediate portion between the first end 108 and the second end 113 of the clip arm 106 is provided with a perforated recess for forming a clinch connection with another clip, as shown in figures 1A-1C. However, the recess is not an essential part, and is not required, for example, when the fastener is used as a sub-fastener of a right-angle fastener; also, for example, the recess is not required when the fastener is used alone as a connecting fastener. This is also true in the following examples.

A clip according to a second embodiment of the invention will now be described with reference to figures 2A to 2C, which differs from the clip of the first embodiment in the rotatable connection between the arms. As shown in fig. 2A-2C, the fastener for clamping an object of the present embodiment includes a clamping arm 201, a clamping arm 202 and a connecting buckle 203. The connection button 203 may constitute the winding portion. The first end of the clamping arm 201 and the first end of the clamping arm 202 are rotatably connected through a connecting buckle 203, a cavity for accommodating an object when the object is clamped is formed between the clamping arms 201 and 202, the first end of the clamping arm 201 is provided with at least one first through hole communicated with the cavity, the edge of the first through hole forms the pin shaft, the first end of the clamping arm 202 is provided with at least one second through hole communicated with the cavity, and the two ends of the connecting buckle 203 respectively penetrate through the first through hole and the second through hole towards the cavity direction and wind the edges of the first through hole and the second through hole so as to form rotatable connection, wherein the tail ends of the two ends of the connecting buckle 203 are positioned in the cavity and are in frictional contact with the object when the fastener clamps the object.

Preferably, the connecting fastener is a strip-shaped connecting fastener formed by bending a strip-shaped steel plate, a steel strip or a steel bar. However, the connecting fastener may have other shapes as long as the end portion of the connecting fastener can extend into the through hole of the clamping arm to hook the edge of the through hole.

The rim of the first and/or second through hole may be a thickened portion to increase the strength of the rotatable connection of the fastener, and is preferably cylindrical to facilitate mobility of the formed rotatable connection.

The second ends of the clamping arms 201 and 202 may each have a gap or seamless slot for a bolt or other locking device to pass through to secure the second ends of the clamping arms 201, 202 to one another.

A fastener according to a third embodiment of the present invention will now be described with reference to figures 2D-2E. As shown in fig. 2D-2E, the difference between the fastener for clamping objects of this embodiment and the fastener of the second embodiment is that the clamping arm 205 of the fastener of the third embodiment is rotatably connected to one end 209 of the connecting buckle 207, while the edge of the through hole in the other clamping arm 206 for connecting with the connecting buckle 207 is flat, and is connected to the other end 208 of the connecting buckle 207 to form a non-rotatable and movable connecting structure.

A fastener according to a fourth embodiment of the present invention will now be described with reference to figures 2F-2H. As shown in fig. 2F-2H, the difference between the fastener for clamping an object of the present embodiment and the fastener of the second embodiment is that one end 213 of the connecting buckle 212 of the fastener of the fourth embodiment is rotatably connected to the clamping arm 210, and the other end 214 of the connecting buckle passes through the through hole of the clamping arm 211 in a direction away from the cavity between the clamping arms 210 and 211 to be attached to the edge of the through hole, and the attached portion is preferably welded to form a non-rotatable and movable connecting structure.

A fastener according to a fifth embodiment of the invention will now be described with reference to figures 3A-3C. As shown in fig. 3A-3C, the clip for clamping an object in this embodiment comprises a clamping arm 301, a clamping arm 302 and a pin 304, wherein a first end of the clamping arm 301 and a first end of the clamping arm 302 are rotatably connected by the pin 304, and a cavity for accommodating the object when clamping the object is formed between the clamping arms 301 and 302, wherein the first end of the clamping arm 301 has at least one first extension 303, the first extension 303 constitutes the winding portion and winds the pin 304 toward the cavity to form the rotatable connection, the first end of the clamping arm 302 has at least one second extension 305, the second extension 305 winds the same pin 304 toward the cavity, and ends of the first and second extensions 303 and 305 are located in the cavity and frictionally contact with the object when the clip clamps the object.

The pin 304 may have a variety of shapes, such as a cylindrical shape, an elliptic cylindrical shape, a polygonal prism shape, etc., but is convenient for forming a rotatable connection and has sufficient strength.

The second ends of the clamp arms 301 and 302 may each have a notch or seamless slot for a bolt or other locking device to pass through to secure the second ends of the clamp arms 301, 302 to one another.

Preferably, the body of the gap is larger and the opening is smaller so that the bolt can pass longitudinally through the gap without moving transversely out of the gap, thereby facilitating retention of the bolt in the gap. The bolt is preferably a t-bolt.

Fig. 3D-3E show a fastener of a sixth embodiment. The difference between this fastener and the fifth embodiment is that a loop fastener is used, with the side edge (i.e., the periphery) of the loop fastener acting as the pin. Specifically, the fastener comprises a first clamping arm 316, a second clamping arm 320 and a ring fastener 319, wherein the side edge of the ring fastener 319 forms the pin, the first end of the first clamping arm 316 and the first end of the second clamping arm 320 are respectively connected with the ring fastener 319 in a rotatable manner, a cavity 325 used for accommodating an object when clamping the object is formed between the first clamping arm and the second clamping arm, the first end of the first clamping arm 316 is provided with at least one first extension 317 (used as the winding part), and the first extension 317 penetrates through a central hole of the ring fastener 319 towards the cavity 325 to wind the side edge of the ring fastener 319, so that the rotatable connection is formed; the first end of the second clamping arm 320 has at least one second extension 321 (which may also be used as the winding part), and the second extension 321 penetrates the central hole of the ring buckle 319 towards the cavity 325 to wind the lateral edge of the ring buckle 319, so as to form a rotatable connection; wherein the ends of the first and second extensions 317, 321 are located in the cavity 325 and are in frictional contact with an object when the fastener is gripping the object.

A slit or seamless slot is provided at the second end 318, 322 of the clip arm 316, 320 for passage of a bolt 324, which bolt 324 is secured by a nut 323.

The loop 319 may be a closed or non-closed loop formed by a strip of material joined end to end, such as a square loop, which is wrapped around the first or second extension 317, 321 at the end to end. When the fastener is used for clamping an object, the free end of the extension part is fixed between the clamped object and the buckle in a friction mode, certain elastic deformation can be generated due to pressure, the buckle is further extruded, and when the head-tail connection position of the buckle is located in the extension part, the buckle can be firmly fixed due to the pressure and the friction between the buckle and the extension part, and is not easy to loosen.

The loop 319 is very simple to manufacture and may be formed by simply bending the reinforcement ends to ends, and the ends to ends need not be welded but may be secured by frictional contact with the clip arm extensions around which they are wound.

The swivel clip can be constructed by clinching two sixth embodiment clips one clip arm to each other as shown in figures 3F-3G, wherein the two sub clips are rotatably connected by clinch connection 326.

Figures 15A-15B show a fastener of a twelfth embodiment which differs from the fastener of the sixth embodiment in that the second clip arms 320 'differ from the second clip arms 320 in that the clip arms 320' of the twelfth embodiment are formed by stamping a steel plate to form apertures for the eye and the bolt to pass through. A right angle clip may be formed by securing the second clip arms of two clips as shown in figures 15A-15B to each other, and the right angle socket of the right angle clip may be stamped from a single sheet of steel as shown in figure 15C.

In the above various fasteners of the present invention, in order to further increase the friction force with the clamped object, the end of the extension portion is matched with the shape of the clamped object to increase the contact area and increase the safety. For example, if the clamped object is tubular, the surface of the distal end of the extension portion contacting the clamped object is cylindrical, so that the extension portion completely fits the clamped object. Of course, it will be understood by those skilled in the art that the extension tip may have a different matching shape depending on the shape of the object to be clamped, and that the size of the extension tip may be intentionally increased to provide better contact with the object and increase the strength of the extension tip.

The through holes in the clamping arms can have different shapes, such as circular, rectangular, square, triangular, polygonal, etc., and it will be understood by those skilled in the art that they can be selected according to actual needs.

To further reduce the weight of the clip and simplify the process of making the clip, the intermediate portion between the first and second ends of the clip arms of the present invention may have at least one opening communicating with the clip cavity. More preferably, the opening in the middle part of the clamping arm is in communication with the through hole and/or the slit or notch in the clamping arm. More preferably, the clamp arms are formed by reshaping and punching U-shaped steel bars (or round steel bars), as shown by clamp arms 1101-1104 in FIG. 11A, clamp arms 501 'and 502' in FIG. 5E, and clamp arms 1301 and 1305 in FIG. 13A.

In the fastener of the invention, a winding portion (e.g. the said extension of one end of the clip arms, or the end of the connector clip) forming a winding aperture, around which the pin, or the edge of a through hole forming the pin, the side edge of a clasp or other component, is wound, the free end of which is located in the cavity between the clip arms of the fastener and is in frictional contact with an object when the fastener is gripping the object. Through this kind of unique design, ingenious utilized the fastener itself and by the pressure between the centre gripping object, formed frictional force between winding part (especially winding part free end) and by the centre gripping object, this frictional force increases along with the increase of the pressure between fastener and by the centre gripping object moreover, has strengthened the centre gripping effect of fastener greatly, and need not to weld winding part free end and arm lock body in order to form sealed ring structure, simplified the fastener processing technology. For example, a conventional clip that does not adopt such a design can only independently achieve its own clamping strength by using the structure of the clip itself, and does not enhance the firmness of the clip by using any force between the clip and the object to be clamped, and can only achieve a clamping force of 1-2 tons due to the limitation of the connection part (e.g., rotatable connection) between the clip arms. The special structure is adopted for connection between the clamping arms of the fastener, so that the friction force is fully utilized, and when the load is larger, the friction force is correspondingly increased, and the clamping effect of the fastener is greatly enhanced, for example, the fastener can realize the clamping force of 3 tons, 4 tons, 5 tons or even higher, and the clamping effect is improved by several times compared with the traditional fastener.

As can be seen from the above description, the first and second clip arms of the clip of the present invention are rotatably connected to each other by a rotatable connection mechanism comprising a pin and a winding portion rotatable about the pin by winding the pin, the free end of the winding portion (e.g., the end of extension 110) being located in the cavity formed between the first and second clip arms and being in frictional contact with an object when the clip grips the object. By this frictional contact, the free end is firmly fixed by the frictional force generated when the fastener grips the object. The winding part can be an extension part at the tail end of the first clamping arm and/or the second clamping arm, or a connecting buckle connected with the first clamping arm and the second clamping arm, and the pin can be the edge of a through hole at one end of the first clamping arm and/or the second clamping arm, or a pin or a ring buckle connected with the first clamping arm and the second clamping arm.

Moreover, the resistance to deformation of the fastener of the invention is greatly improved. For example, when a conventional fastener deforms under a heavy load condition, particularly when a movable connecting portion between the clip arms deforms, the connection between the clip arms of the fastener is often damaged, so that the clip arms are separated from each other and cannot be used, potential safety hazards exist, and the safety of the fastener is reduced. However, for the fastener of the present invention, if the winding portion (e.g., the extension portion of the clip arm) is deformed due to a large load, for example, the end of the extension portion is further pressed to clamp the pin shaft or to serve as the edge of the through hole of the pin shaft, the side edge of the buckle, or the like, the friction between the end of the extension portion and the edge, the side edge of the buckle, or the pin shaft is further increased, so that the degree of wrapping the edge, the side edge, or the pin shaft by the extension portion and the friction are increased, the strength of the connection portion between the clip arms is further increased, the clip arms are prevented from being loosened.

In the fastener of the above embodiment, the clamping arm having the extension portion may be formed by bending a strip, and two ends of the strip are arranged side by side to form the extension portion together for winding the pin. The clamping arm with the through hole is formed by a closed or non-closed ring formed by connecting the strip-shaped objects end to end, and the end to end position is positioned at the first end of the clamping arm or the opposite end of the first end. For example, in the fastener of the tenth embodiment shown in fig. 13A-13C, the clamping arms 1301 are formed by bending a strip, the ends of the bent strips are arranged side by side and together form an extension 1303 of the clamping arms 1301, and the free end 1304 of the extension 1303 is located in the cavity between the clamping arms and is in contact with the clamped object; at the other end 1302 of the clamp arm 1301 there is a through hole communicating with the cavity. The clamp arm 1305 is formed of a closed or non-closed loop formed by connecting the strips end to end, and the end to end is located at the first end 1306 or the second end 1307 of the clamp arm 1305. Extension 1303 is wrapped around its first end 1306 through a central aperture in clamp arm 1305 to form a rotatable connection between the two clamp arms. A cylindrical bushing 1316 may be provided between the first end 1306 and the extension 1303, and the bushing 1316 may have a longitudinal gap such that the bushing 1316 can grip the first end 1306 when compressed. The bushing may be used in each rotatable connection.

In the tenth embodiment of the fastener, the second end 1302 of the clip arm 1301 is provided with a buckle 1310, one end 1311 of the buckle 1310 is provided with a notch or a seamless notch for allowing one end of the hook bolt 1308 to pass through for engagement, the opposite end 1312 of the buckle 1310 is passed through the through hole of the second end of the clip arm 1301 towards the cavity of the fastener and is wound around the edge of the through hole to form a rotatable connection, and the end of the opposite end 1312 is located in the cavity of the fastener and is in frictional contact with an object when the fastener clamps the object; the other end 1313 of the back hook bolt 1308 hooks over the second end 1307 of the clip arm 1305 to form a rotatable connection, and the end 1314 of the other end is located in the cavity of the clip and is in frictional contact with the object when the clip grips the object. The barbed bolt 1308 secures the second ends 1302 and 1307 of the two clip arms to each other by means of a washer 1315 and a nut 1309.

Figure 13D shows a clip of the eleventh embodiment which differs from the tenth embodiment in that the second end 1307 of the clip arm 1305 has a second catch 1320 (such as the catch 519 shown in figure 5E, which is equally applicable to this embodiment) which has one end 1321 with a break or seamless notch for engagement with the bolt 1308', and the opposite end 1322 of the second catch is passed through the central aperture of the clip arm 1305 towards the clip cavity and wrapped around the second end 1307 to form a rotatable connection, with the ends of the opposite end 1322 located within the clip cavity and in frictional contact with an object when the clip grips the object. The hasp is easy to manufacture and can flexibly rotate on the clamping arm, so that the flexibility of the clamping arm in opening and locking is improved, and the usability of the fastener is improved.

Fig. 13H-13I show the buckle 1310 alone, and fig. 13I shows the buckle 1310 in a state before bending. In use, a gap 1317 is formed between both ends of the buckle 1310, and when the buckle is bolted, one end 1312 of the buckle abuts against the clamped object, and the other end 1311 may abut against the end 1312 due to elastic deformation of the buckle itself, so that the pressure and friction of the end 1312 against the clamped object are further enhanced, and the gap 1317 disappears. The specific position of the slit 1317 is not limited. Preferably, the location of the gap is desired to facilitate the size balance of the two ends 1311, 1312 of the buckle 1310, thereby facilitating the manufacture of the buckle 1310.

In order to increase the rotational flexibility of the rotatable connection and to increase its robustness, a cylindrical bushing can be placed around the pin forming the rotatable connection, around which bushing the winding is wound. For example, there may be a cylindrical bushing between the extension forming the rotatable connection and the rim of the through hole or the side edge of the buckle, or between the connection buckle forming the rotatable connection and the rim of the through hole, or between the extension forming the rotatable connection and the pin. Preferably the bushing is provided with a longitudinal slit so that the bushing can contract when compressed into frictional contact with an object located within the bushing.

In the various fasteners of the present invention, the free ends of the clip arms (i.e., the second ends described above) may also be locked using bolts as in the prior art.

However, in the various fasteners of the present invention, the clip arms of the fastener may be locked by a self-locking device as described below. That is, the rotatable movable connection mechanism between the clip arms in the fastener of the first, second, third, fourth, fifth, sixth, tenth, eleventh, twelfth embodiments of the present invention can be used in any combination with the self-locking device described below, and the clip arms can also be used in any combination with the self-locking device directly or after small modification, as long as there is no structural conflict. In fact, the fastener of the embodiments of the present invention is divided into a plurality of parts, and the parts can be combined and matched as required, as long as there is no structural conflict. For convenience of description, the fasteners of the seventh and eighth embodiments are only used as examples in this specification to illustrate the fasteners of the self-locking device of the present invention.

In a preferred embodiment, one of the clip arms of the clip may have a self-locking means thereon for locking the free end of the clip arm.

The self-locking device will be described first. According to a first embodiment of the self-locking device, as shown in fig. 4A, the self-locking device comprises a self-locking base 101 having a cavity, a self-locking lever 102 at least partially located in the cavity, and a locking block 103, wherein a sidewall of the cavity comprises a first frictional contact surface (i.e., a locking surface) W, the self-locking lever 102 is extendable into the self-locking base 101 and has a second frictional contact surface M facing the frictional contact surface W and making an angle α with the frictional contact surface W. The locking piece 103 is movable and can be arranged between and in contact with the friction contact surfaces W and M, and the locking piece 103 can have different shapes according to the needs, for example, can be spherical, cylindrical, polyhedral, etc. The self-locking device may further comprise a retaining member (not shown in fig. 4A), which may be a spring, one end of which is fixed to the self-locking base 101, and the other end of which exerts an elastic pre-load force on the locking piece 103 in the direction indicated by the vertex of angle α. Here, the self-locking lever 102 may contact the self-locking seat, but the contact surface is a smooth contact surface or a substantially smooth contact surface.

In the first embodiment of the self-locking device, self-locking of the self-locking lever 102 can be achieved by contact friction of the locking block 103 with the two friction contact surfaces W, M in the self-locking base cavity, i.e. the self-locking lever 102 is movable in a first direction F1 relative to the self-locking base and locked in a second direction F2 opposite to the first direction, so that the self-locking lever 102 can be locked in any continuous locking position. Here, the first direction F1 is substantially the direction indicated by the vertex of the angle α. When the lock piece 103 is brought out of contact with the at least one frictional contact surface W, M by applying a force to the lock piece 103 in a direction opposite to the direction indicated by the vertex of the angle α (in the case where the holding member is present, the force applied to the lock piece 103 by the holding member is overcome), the lock of the lock piece 103 is released, and at the same time, the lock of the self-locking lever 102 is released, and the self-locking lever 102 is movable in the second direction F2. Therefore, as long as the lock piece remains in contact with the frictional contact surface W, M without being released, the lock is maintained from the lock lever 102 in the second direction F2.

The self-locking theory of the first embodiment of the self-locking device is as follows:

according to the principle of self-locking, as shown in fig. 4A, the acting force of the first frictional contact surface W on the lock block 103 is R₁₃The acting force of the second friction contact surface M on the locking block 103 is R₂₃Let the elastic force of the spring on the lock block 102 be P, the included angle between P and the second friction contact surface M be beta, alpha be the included angle between the first friction contact surface W and the second friction contact surface M,andthe friction angles of the locking piece 103 relative to the first frictional contact surface W and the second frictional contact surface M, respectively, wherein the friction anglesAndcoefficient of friction mu corresponding thereto₁And mu₂Is in the relationship ofIt should be noted that, depending on the application, the friction coefficient of the locking piece 103 with respect to the first and second frictional contact surfaces W and M may be the same or different, and therefore,andmay be the same or different. In the figure, Y₁And Y₂Indicating a normal.

Referring to fig. 4B, the self-locking condition is determined according to a condition that the resistance generated during the reverse stroke is less than or equal to zero.

Finishing to obtain:

if the locking block is required not to be automatically released, P is less than or equal to 0 becauseTherefore, it is not only easy to useNamely the self-locking condition is that

That is, at an angle α less than or equal to the friction angle of the lock piece 103 with respect to the first and second frictional contact surfaces W and M, respectivelyAndwhen is at timeThe self-locking lever 102 is movable in a first direction F1 with respect to the self-locking base 101 and is locked and held immovably in a second direction F2 opposite to the first direction, so that the self-locking lever can be locked in any one of the continuous locking positions.

For example, in the case that the self-locking base, the self-locking lever and the locking block are all made of steel, the friction coefficient of the steel and the steel is about 0.15Angle of friction thereofAndare each about 8.5 deg., and therefore, the angle alpha should be less than or equal to about 17 deg.. Each component of the self-locking device may be made of different materials (e.g., metal, plastic, ceramic, etc.) as desired, the materials may be different between the various components, and even each component itself may be made of different materials.

According to the principle of the first embodiment of the self-locking device, a plurality of first embodiments of the self-locking device can be arranged on a required device, and two first embodiments of the self-locking device can be arranged symmetrically.

For example, fig. 4C and 4D are used to illustrate the structure and principle of the second embodiment of the self-locking device in the fastener according to the present invention.

As shown in fig. 4C, the second embodiment of the self-locking device is a combination of the first embodiments of the two self-locking devices. Specifically, the self-locking device of the present embodiment includes a self-locking base 111 having a cavity, a self-locking lever 112 at least partially extending into the cavity, and a first locking block 113 and a second locking block 113a, wherein a sidewall of the cavity includes first and fourth frictional contact surfaces 111W, 111M, the self-locking lever 112 has second and third frictional contact surfaces 112M, 112W, the first frictional contact surface 111W faces the second frictional contact surface 112M and forms an angle α therewith, and the fourth frictional contact surface 111M faces the third frictional contact surface 112W and forms an angle α' therewith. The first locking piece 113 is movable and can be placed between and in contact with the first and second frictional contact surfaces; the second locking piece 113a is movable and can be placed between and in contact with the third and fourth frictional contact surfaces. Similar to the first embodiment of the self-locking device, the self-locking device of this embodiment may also include a retaining member for applying elastic pre-load to the first and second locking blocks 113 and 113a in the directions indicated by the vertices of the angle α and the angle α', respectively.

As can be seen from the above description in connection with the first embodiment of the self-locking device, if the angle α between the first friction surface 111W and the second friction surface 112M, the friction angle of the first lock piece 113 with respect to the first and second friction contact surfacesAndsatisfy the requirement ofThe angle α' between the third friction surface 112W and the fourth friction surface 111M, the angle of friction of the second locking piece 113a with respect to the third and fourth friction contact surfacesAndsatisfy the requirement ofThe self-locking lever 112 can be made movable in a first direction F1 with respect to the self-locking base 111 and locked and held immovably in a second direction F2 opposite to the first direction, so that the self-locking lever can be locked in any one of the continuous locking positions. In addition, if the angle between the second and third frictional contact surfaces 112M, 112W is γ, the angle between the first frictional contact surface 111W and the fourth frictional contact surface 111M is γThrough the principle, the included angle of the cavity of the self-locking base can be designed, and the self-locking rod can be locked at any continuous locking position under the action of the locking block.

For example, in the case where the self-locking base, the self-locking lever and the locking piece are made of steel, the friction angle is about 0.15 because the friction coefficient between steel and steel is aboutAre each about 8.5 deg., and thus, angles alpha and alpha' should be equal to or less than about 17 deg.. Each component of the self-locking device may be made of different materials (e.g., metal, plastic, ceramic, etc.) as desired, the materials may be different between the various components, and even each component itself may be made of different materials.

5A, 5B, 5C and 5D, a seventh embodiment fastener is obtained by adding the self-locking device described above with a slight modification to the fifth embodiment fastener. Specifically, the self-locking device comprises a self-locking base 504, a self-locking rod 505, a first locking block 508 and a second locking block 509, wherein the self-locking base 504 is provided with a cavity, and the side wall of the cavity comprises a first friction contact surface 511 and a fourth friction contact surface 514; the self-locking lever 505 has a second friction contact surface 512 and a third friction contact surface 513, and can extend into the cavity of the self-locking base 504 such that the second friction contact surface 512 faces the first friction contact surface 511, the third friction contact surface 513 faces the fourth friction contact surface 514, and the first locking piece 508 is movable and can be placed between the first friction contact surface 512 and the second friction contact surface 512 and in contact with the first and second friction contact surfaces, and the second locking piece 509 is movable and can be placed between the third friction contact surface 513 and the fourth friction contact surface 514 and in contact with the third and fourth friction contact surfaces; the angle between the first and second frictional contact surfaces 511, 512 is α, the angle between the third and fourth frictional contact surfaces 513, 514 is α ', and the friction angles of the first lock piece 508 with respect to the first and second frictional contact surfaces are α', respectivelyAndthe friction angles of the second locking piece 509 with respect to the third and fourth frictional contact surfaces areAndwherein,and is

As shown in fig. 5C, the included angle α and α' apex angle orientations may be substantially the same.

One end of self-locking rod 505 has a flange which can be engaged with the second end (i.e. free end) of clip arm 502 through a notch 506 at the second end of clip arm 502; the other end also has at least one flange to facilitate pulling or squeezing the self-locking bar 505.

Self-locking base 504 and clip arm 501 may be integrally formed or may be movably connected (as shown in the eighth embodiment).

The lock block 508 and/or the lock block 509 may be terminated outside the cavity of the self-locking base and have a flange to apply a force thereto.

Preferably, 0 < α ≦ 17 ° and/or 0 < α' ≦ 17 °.

Preferably, the first frictional contact surface 511 and the fourth frictional contact surface 514 are symmetrically disposed with respect to a longitudinal axis of the self-locking base 504, and the second frictional contact surface 512 and the third frictional contact surface 513 are symmetrically disposed with respect to a longitudinal axis of the self-locking bar 505 such that α ═ α'.

The locking pieces 508, 509 may be slidable along the first and fourth frictional contact surfaces 511, 514, respectively. In particular, the inner wall of the self-locking base 504 is provided with at least one first sliding groove or rib for the locking block 508 and at least one second sliding groove or rib for the locking block 509, the locking block 508 is provided with a protrusion or sliding groove matching with the first sliding groove or rib in shape, and the locking block 509 is provided with a protrusion or sliding groove matching with the second sliding groove or rib in shape.

The self-locking device may further comprise at least one elastic member 507, one end of the elastic member 507 is located on the self-locking base 504, and the other end is located on the locking block 508 and/or 509 for keeping the locking blocks 508, 509 in contact with the self-locking bar 505. As shown in fig. 5A-5D, the retaining member 507 is a spring disposed between the bottom surface of the self-locking base 504 facing the opposite clamp arm (i.e., clamp arm 502) and the flanges of the lock blocks 508, 509.

When the fastener of this embodiment is used, as shown in fig. 5A, the clip arms 501 and 502 are clipped on the object to be clamped, one end of the self-locking lever 505 is inserted into the second end notch 506 of the clip arm 502 to engage with the second arm, and the other end of the self-locking lever 505 is moved in a direction (hereinafter referred to as a locking direction) away from the clip arm 502, and the locking blocks 508 and 509 (for example, under the action of the holding member 507) are moved in the vertex angle directions of the included angles α and α' to maintain contact with the base 504 and the self-locking lever 505, and due to the self-locking principle of the self-locking device, the self-locking lever 505 can be moved in the locking direction and locked in the direction (hereinafter referred to as an unlocking direction) opposite to the locking direction, so that the two clip arms 501 and 502 of the fastener are locked, thereby clamping. When the fastener is to be detached from the object, the lock block 508 and/or the lock block 509 is moved in the locking direction, and the self-locking lever 505 is released and can be moved in the unlocking direction, so that the self-locking device is unlocked.

The self-locking device has continuous locking positions, and locking can be realized as long as the locking block is simultaneously contacted with the friction contact surfaces of the self-locking rod and the self-locking base.

5E-5G show a clip of an eighth embodiment of the invention in which both arms and their connection are the same as in the tenth embodiment, and in which one end of arm 501 ' hooks over one end of arm 502 ' to form a rotatable connection such that the end 517 of arm 501 ' is located in the cavity between the arms and contacts the object being clipped when the clip clips the object, and preferably there is also a cylindrical hub 515 in the rotatable connection, which hub 515 may have a longitudinal slot; moreover, the self-locking mechanism of the eighth embodiment fastener is substantially the same as the seventh embodiment fastener, but differs from the seventh embodiment in that the self-locking base 504 ' is rotatably connected to the clip arms 501 ' by lateral ears 518, the ears 518 engaging the clip arms 501 ' and having free ends located in the fastener cavities and frictionally engaging an object when the fastener is engaged with the object. The other end of the clip arm 502' is wrapped with a buckle 519, one end 521 of the buckle 519 has a cutout for engagement with one end of a self locking bar 505 of a self locking device, and the other end 510 of the buckle 519 is located within the cavity of the fastener and is in frictional contact with an object when the fastener is gripping the object. The self-locking base 504 and the clamping arm 501 are integrally formed and can only rotate together with the integrally formed clamping arm; but the self-locking base 504 'can rotate relative to the connected clamping arm 501' and the rotation center is closer to the buckle 519, so that the self-locking rod 505 is more flexible and convenient in practical use and is beneficial to shortening the length of the self-locking rod 505.

Fig. 6A-6F show a schematic view and a cross-sectional view of a self-locking device according to a ninth embodiment of the invention. The self-locking device is substantially the same as the self-locking device in the seventh and eighth embodiments. The self-locking device comprises a self-locking base 604, a self-locking rod 605, a first locking block 608 and a second locking block 609, wherein the self-locking base 604 is provided with a cavity, and the side wall of the cavity comprises a first friction contact surface 611 and a fourth friction contact surface 614; the self-locking lever 605 has a second friction contact surface 612 and a third friction contact surface 613, and can extend into the cavity of the self-locking base 604, so that the second friction contact surface 612 faces the first friction contact surface 611, the third friction contact surface 613 faces the fourth friction contact surface 614, the first locking piece 608 can be moved and is arranged between the first friction contact surface 612 and the second friction contact surface 612 and is contacted with the first friction contact surface and the second friction contact surface, and the second locking piece 609 can be moved and is arranged between the third friction contact surface 613 and the fourth friction contact surface 614 and is contacted with the third friction contact surface and the fourth friction contact surface; the first and second frictional contact surfaces 611 and 612 have an angle α therebetween, the third and fourth frictional contact surfaces 613 and 614 have an angle α' therebetween, and the first lock piece 608 has a friction angle with respect to the first and second frictional contact surfaces, respectivelyAndthe friction angles of the second locking piece 609 relative to the third and fourth frictional contact surfaces are respectivelyAndwherein,and is

As shown in fig. 6D, the included angle α and α' apex angle orientations may be substantially the same.

Preferably, 0 < α ≦ 17 ° and/or 0 < α' ≦ 17 °.

Preferably, the first and fourth frictional contact surfaces 611, 614 are arranged symmetrically with respect to the longitudinal axis of the latching base, and the second and third frictional contact surfaces 612, 613 are arranged symmetrically with respect to the longitudinal axis of the self-locking lever 605, so that α ═ α'.

The locking pieces 608 and 609 may be slidable along the first and fourth frictional contact surfaces 611 and 614. In particular, the inner wall of the self-locking base 604 is provided with at least one first sliding groove or protruding rib for the locking block 608 and at least one second sliding groove or protruding rib for the locking block 609, the locking block 608 is provided with a protrusion or sliding groove matching with the first sliding groove or protruding rib in shape, and the locking block 609 is provided with a protrusion or sliding groove matching with the second sliding groove or protruding rib in shape.

The self-locking device may further include at least one elastic member 617, 818 for each locking piece, where the elastic member 617, 618 is located inside the self-locking base 604, and one end of the elastic member abuts against the inner wall of the self-locking base 604 or against the upper cover 607 of the self-locking base 604, and the other end abuts against the locking piece 608 and/or 609, so as to keep the locking piece in contact with the self-locking lever 605 and not make the locking piece separate from the cavity in the self-locking base 604. The retention features 617, 618 may be springs and are symmetrically disposed on either side of the locking blocks 608 and 609 in the grooves 624, 625. Preferably, spherical balls 616, 615 are provided at both ends of the elastic members 617, 618 to facilitate stable fixation of the respective elastic members. Preferably, the cover 607 hooks the self-locking base 604 with the flange 610.

The ends of lock block 608 and/or lock block 609 may be outside the cavity of self-locking base 604 and have flanges 620 and 621 for applying force to pull them up and may have platforms 606 and 615 for applying pressure to them.

When the self-locking device of the present embodiment is used, as shown in fig. 6E, the self-locking lever 605 is inserted between the lock blocks 508 and 509 in the direction F6, and a force is applied to the self-locking lever 605 and the lock blocks 608 and 609 together, so that the self-locking lever 605 moves in the direction F6, and the lock blocks 608 and 609 move in the direction F7 and keep in contact with the base 604 and the self-locking lever 605. Specifically, this is accomplished by a tool that applies pressure to platforms 615, 616 while lifting self-locking lever 605 against protrusion 617 or 618 that facilitates an end of self-locking lever 605. Due to the self-locking principle of the self-locking device, the self-locking lever 605 can move along the direction F6 and is locked in the direction F7, so that the self-locking lever 605 is locked. When the self-locking device is to be unlocked, the lock block 508 and/or the groove 622 and/or 623 on the lock block 509 are/is utilized to pry the lock block along the direction F6, and then the pried lock block is separated from the self-locking rod 605, so that the self-locking rod 605 is released and can move along the direction F7, and the self-locking device is unlocked.

Preferably, the other end of self-locking lever 605 has a cap 619 that can be used to apply a force to it to facilitate pushing self-locking lever 605 into the cavity of self-locking base 604, but keep self-locking lever 605 from falling completely through the cavity.

As shown in fig. 6F, the self-locking lever may be sized as desired, for example, shorter to suit the needs of a particular application. In the situation shown in fig. 6F, self-locking rod 605 can be pushed into the cavity of self-locking base 604 and locked by a tool acting on cap 619 and platforms 615, 615 simultaneously.

To further reduce the weight of the clip, the intermediate portion between the first and second ends of the clip arms has an opening communicating with the clip cavity. Preferably, the opening of the middle part of the fastener is communicated with the through hole and/or the notch or notch on the clamping arm. That is, the clamping arm of the fastener can be formed by bending, shaping and stamping the steel bar.

The fasteners can be used independently, or can be combined to form a rotary fastener or a right-angle fastener for use.

The invention also discloses a rotating fastener, which comprises two fasteners as described in the first to eighth, tenth to twelfth embodiments or any combination thereof, wherein one clamping arm of one of the two fasteners is rotatably connected with one clamping arm of the other fastener to form a rotating seat of the rotating fastener, and the rotatable connection is, for example, a rivet connection. Preferably, the two arms constituting the swivel base are rotatable with respect to each other in a plane perpendicular to the plane of rotation of the respective arms of the two clasps. The plane of rotation of the clip arms herein refers to the plane formed by the rotation of the arms about the rotatable connection between the arms of the clip.

The invention also discloses a right-angle fastener, which comprises two fasteners as described in the first to eighth and tenth to twelfth embodiments or any combination thereof, wherein one clamping arm of one of the two fasteners is fixedly connected with one clamping arm of the other fastener to form a right-angle seat of the right-angle fastener, and the fixed connection is realized by welding the two clamping arms together or integrally forming the two clamping arms. Preferably, the respective planes of rotation of the two arms constituting the right-angled seat are perpendicular to each other.

One example of a rotational fastener of the present invention is shown in fig. 7A-7B. Such a rotating fastener typically comprises two sub-fasteners which are connected together by a rotatable connection, such as a rivet-roll connection, and which can be rotated at any angle. The clip arms of each sub-clip and the connection structure between the clip arms are similar to those of the second embodiment, but the self-locking device is similar to that of the seventh embodiment. As shown in fig. 7A-7B, the rotating fastener comprises a first fastening member and a second fastening member, the first fastening member comprises clamping arms 701 and 702, a pin 705 and a self-locking device on the clamping arm 701, the self-locking device comprises a self-locking base integrally formed with the clamping arm 701, a self-locking rod 706, a locking block 708 and an elastic component 709; the second clamping part comprises clamping arms 703 and 704, a pin 710 and a self-locking device on the clamping arm 704, wherein the self-locking device comprises a self-locking base, a self-locking rod 711, a locking block 712 and an elastic part 713, and the self-locking base and the self-locking rod are integrally formed with the clamping arm 704.

Fig. 5I shows a rotational fastener in which two sub-fasteners of the eighth embodiment shown in fig. 5E are combined. As shown, the arms 502' of the two sub-clips are connected together by a rotatable connection, such as a clinch connection, and can be rotated at any angle; the rivet joint includes rivet seats 523 and 531 and a rivet 532 for connecting the two rivet seats, wherein the rivet seat 523 is fixed on one arm of the rotating seat of the rotating fastener, and the rivet seat 531 is fixed on the other arm of the rotating seat. Similarly, FIGS. 3F-3G illustrate a rotational fastener in which two fasteners according to the sixth embodiment of FIG. 3D are combined as a separate fastener, the rotational fasteners being rotatably connected by a rivet 623.

However, it should be understood that the rotating fastener is only formed by taking the fastener of a specific embodiment as an example of the sub-fastener, and the rotating fastener may also be formed by using the fasteners of other embodiments, which is not described herein again.

A schematic perspective view of one example of a right angle fastener of the present invention is shown in fig. 8A, and schematic side views of one example of a right angle fastener of the present invention are shown in fig. 8B-8C. The right-angle fastener generally comprises two sub-fasteners, and the right-angle seat of the right-angle fastener is formed by fixedly connecting one clamping arm of each of the two sub-fasteners with each other, preferably perpendicularly connecting each other. As shown, the first fastening member includes clamping arms 801 and 802, and a self-locking device composed of a self-locking base 807, a self-locking rod 805, a locking block 808 and an elastic member 816; the second fastening member includes clamping arms 803 and 804, and a self-locking device composed of a self-locking base 817, a self-locking rod 815, a locking block 813 and 814, and an elastic component (not shown). The two clamping arms 802, 803 that make up the right angle seat may be welded to each other or integrally formed. Clamp arms 801 and 802 are rotatably connected by extension 806 wrapping around the edge of the through hole in clamp arm 802; the arms 803 and 804 are rotatably connected by an extension 812 wrapped around the edge of the through hole in arm 803. Fig. 8A-8B show a state in which one of the two partial fastening members is locked and the other is opened, and fig. 8C shows a state in which both the two partial fastening members are locked.

In this example, each of the clamping arms 802 and 803 is stamped from a U-shaped steel bar, that is, the through-hole on the first end of each (for forming a rotatable connection with the extension of the mating clamping arm), the notch of the second end, and the opening in the middle portion between the first and second ends all communicate, and the longitudinal direction of the clamping arm 802 (i.e., the direction from the first end to the second end) is perpendicular to the longitudinal direction of the clamping arm 803 (i.e., the direction from the first end to the second end). Because the clamping arm 802 is fixed on the clamping arm 803 along the longitudinal direction of the clamping arm 803 or is integrally formed with the clamping arm 803, the clamping arm 802 is firmer, and the gap at the second end is not easy to deform in practical use, for example, the opening is not easy to enlarge or reduce. As are the clamp arms 803.

Fig. 5H shows another example of the right-angle fastener of the invention, in which two sub-fasteners are formed as in the eighth embodiment, and the clamping arms 502' of the two sub-fasteners are welded and fixed together by being turned 90 degrees from each other to form a right-angle seat. The right angle receptacle of the right angle fastener may be as described below in connection with fig. 14A-14I.

Fig. 13E-13G show another example of a right-angle fastener of the invention, two sub-fasteners constituting the right-angle fastener being as described in example eleven. The clamp arms 1305 of the two sub-clips are welded together by being offset by 90 degrees to each other to form a right angle seat. Wherein fig. 13F shows a cross section of the right angle fastener along line a-a in fig. 13E.

The two clamping arms forming the right-angle seat are all of hollow structures, in other words, the two clamping arms are formed by shaping and stamping U-shaped round steel and are welded together to form the right-angle seat. Under the condition that the free ends of the fasteners are locked to the same extent, the clamping arms have smaller contact areas with the clamped object, and have larger pressure on the unit area of the clamped object, so that the friction force is larger, and the anti-sliding capacity is stronger. Experiments prove that the anti-skid capacity of the fastener is 2 times or even higher than that of the traditional fastener.

It should be understood that the square socket of the square fastener of the invention can also be made as shown in fig. 14A-14I. As shown in FIGS. 14A-14B, two semi-bracket-shaped preforms 1401 and 1403 and 1404 are arranged opposite to each other to form slotted rings, and the two formed rings are vertically crossed and stacked together. Here, preforms 1401-1404 may be formed by bending both ends of a strip (e.g., a steel bar) in the same direction. Preferably, for the welded fastening between the intersection between the two rings formed, and for the rotational flexibility of the rotatable connection on the later clip arms, a cylindrical bush can be added at the gap of the ring formed to surround it, as shown in fig. 14C-14F. And then welding and fixing the two annular parts which are overlapped with each other. The cylindrical liner is preferably a thin steel tube with a longitudinal slit. The two loops secured by welding are then stamped to form a right angle seat for a right angle fastener suitable for holding an object to be clamped, as shown in fig. 14G-14I.

It will be appreciated by those skilled in the art that the fasteners of the first through eighth and tenth through twelfth embodiments may be used to construct the right angle fastener.

For example, fig. 12A-12E show another example of a right-angle fastener according to an embodiment of the present invention, which is different from the right-angle fastener shown in fig. 8A-8C in that the clip arms do not have a self-locking device, and the free ends of the clip arms are locked by a fastening device such as a bolt to achieve the fastening of the fastener. In brief, the right-angle fastener generally comprises two sub-fasteners, and the right-angle seat of the right-angle fastener is formed by fixedly connecting one clamping arm of each of the two sub-fasteners with each other, preferably perpendicularly connecting each other. As shown, the first clutch member includes clamp arms 1201 and 1202; the second clip member includes clip arms 1203 and 1204. The two clamp arms 1202, 1203 forming the right angle seat may be welded to each other or formed integrally. Clamp arms 1201 and 1202 are rotatably connected by extension 1205 wrapping around the edge of the through hole in clamp arm 1202; clamp arms 1203 and 1204 are rotatably connected by extension 1208 wrapping around the edge of the through hole in clamp arm 1203. The free end of the arm 1201 (i.e., the end opposite the extension 1205) includes a notch 1206, the free end of the arm 1204 includes a notch 1209 (i.e., the end opposite the extension 1208), the free end of the arm 1202 (i.e., the end opposite the edge of the arm wrapped around by the extension 1206) includes a notch 1207, the free end of the arm 1203 (i.e., the end opposite the edge of the arm wrapped around by the extension 1208) includes a notch 1210, and the openings of the notches 1207 and 1210 are relatively small so that a bolt cannot be removed from the notch along the notch opening (i.e., in the longitudinal direction of the respective arm 1202 and 1203).

10A-10E illustrate yet another example of a right angle fastener in accordance with an embodiment of the present invention. The two sub-fasteners forming the right-angle fastener are the fasteners shown in FIGS. 2F-2H, the first sub-fastener is composed of clamping arms 1001 and 1002 and a connecting fastener 1005, and the second sub-fastener is composed of clamping arms 1003 and 1004 and a connecting fastener 1006. The two clamp arms 1002 and 1003 forming the right-angle seat may be welded together or may be integrally formed. Preferably, a connection can be further added between the two ends of the clamping arm 1002 and the two ends of the clamping arm 1003, so as to further strengthen the strength of the rigid angle seat. In the right-angle fastener, the object clamped in the first sub-fastener is attached to the end 1009 of the connecting link 1006 of the second sub-fastener and generates friction force, further strengthening the combination of the end 1009 and the clamping arm 1003. Similarly, the object clamped in the second sub-fastening member engages the terminal 1007 of the connecting link 1005 of the first sub-fastening member and generates a frictional force, further strengthening the joint between the terminal 1007 and the clamping arm 1002.

As another example, FIGS. 11A-11C illustrate yet another example of a right angle fastener in accordance with an embodiment of the present invention. The right-angle fastener generally comprises two sub-fasteners, and the right-angle seat of the right-angle fastener is formed by fixedly connecting one clamping arm of each of the two sub-fasteners with each other, preferably perpendicularly connecting each other. As shown, the first dividing clip comprises clamping arms 1101 and 1102 and a connecting buckle 1105, wherein each of the clamping arms 1101 and 1102 is U-shaped and is composed of two symmetrical legs and a connecting part for connecting the two legs, two ends of the connecting buckle 1105 are wound around the connecting parts of the clamping arms 1101 and 1102 so as to form a rotatable connection between the clamping arms 1101 and 1102, and the two ends of the connecting buckle 1105 are located in a cavity between the clamping arms 1101 and 1102 and are in frictional contact with an object when the clip clamps the object; the second sub-fastener comprises two clamping arms 1103 and 1104 and a connecting buckle 1106, the clamping arms 1103 and 1104 are respectively in a U shape and are composed of two symmetrical legs and a connecting part for connecting the two legs, two ends of the connecting buckle 1106 are wound around the connecting parts of the clamping arms 1103 and 1104 so as to form rotatable connection between the clamping arms 1103 and 1104, and the two ends of the connecting buckle 1106 are positioned in a cavity between the clamping arms 1103 and 1104 and are in frictional contact with an object when the fastener clamps the object. The two clamp arms 1202, 1203 forming the right angle seat may be welded to each other or formed integrally.

Preferably, the first and second fastening members may further include spacers 1108 and 1112, respectively, each having a hole in the middle for passing the bolt therethrough, and a limiting protrusion for being snapped outside the free ends of the two legs of the clamping arms 1101 or 1102 to prevent the two legs from being opened apart from each other. The anti-skid capability of the fastener when fastening an object is stronger, and the fastening effect is better.

Preferably, the first and second clamping parts respectively comprise bolts, and the cap of each bolt is provided with a limiting projection for limiting the free ends of the two legs of each clamping arm to be expanded and deformed when the two clamping arms are locked by the bolts passing through the openings of the clamping arms.

In a variation, the swivel fastener can be constructed by attaching the clip arms 1102 and 1103 to a base plate, respectively, without directly attaching them to each other, and clinching the base plates to each other.

The fastener shown in fig. 11A-11C is convenient to process abnormally, and the processing method comprises the following steps: step a) bending a steel bar into a U shape, shaping and stamping to form a clamping arm comprising two symmetrical supporting legs and a connecting part for connecting the two supporting legs; step b), vertically welding the formed second clamping arm and the third clamping arm together to form a right-angle seat; step c) manufacturing strip-shaped steel bars as a first connecting buckle and a second connecting buckle respectively; step d) winding the two ends of the first connecting fastener around the connecting part of the first clamping arm and the connecting part of the second clamping arm, so that the two ends of the first connecting fastener are positioned in a cavity formed by the first clamping arm and the second clamping arm and are contacted with the clamped object when the fastener clamps the object; and e) winding the two ends of the second connecting buckle around the connecting part of the third clamping arm and the connecting part of the fourth clamping arm, so that the two ends of the second connecting buckle are positioned in the cavity formed by the third clamping arm and the fourth clamping arm and are contacted with the clamped object when the fastener clamps the object.

The existing fastener is produced by adopting a casting or hot forging stamping process, the used materials are all common cast iron, plates or round steel, and no precedent of processing by using sectional materials is used, namely, no precedent of directly rolling the steel billet into the sectional materials required by each part of the fastener in the steel rolling process is used, so that the processing cost is high and the process is complex.

The invention also provides a manufacturing method of the fastener, which can be used for manufacturing various fasteners provided in the embodiments, so that the processing technology is greatly simplified, and the cost is greatly reduced.

Figures 9A-9B illustrate rolling a steel blank into a clip arm profile comprising a plurality of clip arm preforms. Fig. 9C-9D show a schematic illustration of a cutting line for a clip arm profile, wherein the clip arm profile comprises two columns of clip arm preforms arranged side by side, which are staggered such that the extensions of the two columns of clip arm preforms for forming the coil holes (further for forming the rotatable connection) are arranged next to each other. Figures 9E-9G show a single clip arm preform cut. Fig. 9H, 9I, 9J show clip arms formed with notches through a piercing process, and extensions of the clip arms extruded to form coil holes.

In the present invention, a first method for making a fastener comprises:

rolling the steel blank into a first clip arm profile having a plurality of first clip arm preforms for forming clip arms 105;

-cutting the first clip arm profile to form a plurality of first clip arm preforms;

-forming a first clip arm by perforating a through-hole in a first end of the first clip arm preform and forming a gap or seamless notch in a second end thereof;

-rolling the steel blank into a second clip arm profile having a plurality of second clip arm preforms for forming clip arms 106;

-cutting the second clip arm profile to form a plurality of second clip arm preforms;

-forming a second clip arm by forming a gap or seamless notch in the second end of the second clip arm preform through a perforation;

-winding the extension of the second clip arm around the edge of the through hole of the first clip arm towards the fastener cavity, so that the end of the extension is located within the cavity and in contact with the object when the fastener grips the object.

In the present invention, a second method for manufacturing a fastener comprises:

-rolling the steel blank into a first clip arm profile having a plurality of fasteners for forming clip arms 201 or 205, a first clip arm preform;

-forming a first clip arm by forming a through-hole in a first end of the first clip arm preform by punching and forming a gap or seamless notch in a second end thereof;

-rolling the steel blank into a second clip arm profile having a plurality of fasteners for forming clip arms 202 or 206 and a second clip arm preform;

-forming a second clip arm by forming a through-hole in a first end of the second clip arm preform by punching and forming a gap or seamless notch in a second end thereof;

-cutting the steel plate to form the connector links 203 or 207;

-passing the two ends of the connector link through the first and second through holes in the first and second clip arms, respectively, towards the cavity of the fastener, and around the edges of the first and second through holes, such that the ends of the connector link are located in the cavity and contact the object when the fastener is holding the object.

In the present invention, a third method for making a fastener comprises:

-rolling the steel blank into a first clip arm profile having a plurality of first clip arm preforms for forming clip arms 301;

-forming a first clip arm by forming a gap or seamless notch in the second end of the first clip arm preform by punching;

-rolling the steel blank into a second clip arm profile having a plurality of second clip arm preforms for forming clip arms 302;

-preparing a pin 303;

-winding an extension of a first clip arm of the clip around the pin towards the cavity of the clip and an extension of a second clip arm of the clip around the pin towards the cavity of the clip such that the end of the extension is located within the cavity and in contact with an object when the clip grips the object.

The execution sequence of each step in the above method is not necessarily executed according to the sequence of the step description. For example, the manufacturing sequence of the first clamping arm, the second clamping arm, the connecting buckle and the pin shaft can be adjusted at will according to the needs. For example, in the fastener manufacturing method, the cutting step may be before or after the perforating step. In addition, in the fastener processing method, the clamp arm type requirements which are actually adopted can be replaced by a processing method of the corresponding type of clamp arm. For example, the step a) may be used instead of the step of processing the clip arms in the first, second, and third methods.

In the first and second clip arm profiles, the first and second clip arm preforms may be arranged side by side in the longitudinal direction of the profiles. Furthermore, a plurality of rows of longitudinally arranged clamping arm preforms can be provided in the same profile. Each row of clip arm preforms may be mirror symmetrical about the longitudinal axis of the profile. Alternatively, two columns of side-by-side clip arm preforms can be staggered with respect to one another, as shown in fig. 9C-9D, such that the extensions of the two columns of clip arm preforms that are used to form the coil holes (and further to form the rotatable connection) are disposed adjacent to one another.

The foregoing detailed description of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. Many modifications and variations are possible in light of the above teaching. The described embodiments are intended to better explain the principles of the invention and its practical application to thereby enable others skilled in the art to best utilize the invention. The scope of the invention is to be defined by the appended claims.

Claims

1. A fastener for gripping an object, the fastener comprising a first clip arm and a second clip arm, a first end of the first clip arm and a first end of the second clip arm being rotatably connected to one another by a rotatable connection, a cavity being formed between the first and second clip arms for receiving the object when gripping the object, characterised in that the rotatable connection comprises a pin and a winding portion wound around the pin so as to be rotatable about the pin, the winding portion being connected at its first end to or being part of one of the first and second clip arms, the pin being connected to or being part of the other of the first and second clip arms, and a second end of the winding portion being located in the cavity and being in frictional contact with the object when the fastener is gripping the object.

2. A fastener for retaining an object according to claim 1, wherein a cylindrical sleeve is provided around the pin and the coil is wound around the sleeve.

3. A fastener for retaining an object according to claim 2, wherein the sleeve has a longitudinal slit.

4. A clip according to claim 1, wherein the first clip arm has a through-hole at its first end communicating with the cavity, the edge of the through-hole forming the pin, and the second clip arm has an extension at its first end forming the winding portion and extending through the through-hole towards the cavity to wind the edge of the through-hole to form the rotatable connection, wherein the extension terminates at a point within the cavity and is in frictional contact with the object when the clip grips the object.

5. The fastener for gripping an object according to claim 4, wherein the rim is a thickened portion; and/or the tail end of the extension part is matched with the shape of the clamped object.

6. A fastener for retaining an object according to claim 5, wherein the rim is a thickened portion, cylindrical in shape.

7. A fastener for clamping objects according to claim 4, wherein the arms having said through-holes are formed by closed or non-closed loops formed by joining the strips end to end, and the joining points are located at a first end of the arm or at the other end opposite to the first end.

8. The fastener of claim 1, further comprising a connecting buckle, the connecting buckle forms the winding portion, the first end of the first clamping arm and the first end of the second clamping arm respectively have a first through hole communicated with the cavity and a second through hole communicated with the cavity, the edge of the first through hole forms the pin, one end of the connecting buckle passes through the first through hole towards the cavity and winds around the edge of the first through hole, so as to form the rotatable connection, and the other end of the connecting buckle passes through the second through hole towards the cavity and winds around the edge of the second through hole, wherein the ends of the two ends of the connecting buckle are located in the cavity and are in frictional contact with the object when the fastener clamps the object.

9. A fastener for clamping objects according to claim 8, wherein said edge of said first and/or second through hole is cylindrical.

10. The fastener for clamping an object according to claim 8, wherein said edge of said first through hole or said second through hole is flat.

11. A fastener for clamping objects according to claim 8, wherein the arms having said through-holes are formed by closed or non-closed loops formed by joining the strips end to end, and the joining points are located at a first end of the arm or at the other end opposite to the first end.

12. The fastener of claim 1, wherein the first end of the first clip arm has a first extension portion that forms the winding portion and winds around the pin toward the cavity to form the rotatable connection, and the first end of the second clip arm has a second extension portion that winds around the pin toward the cavity, wherein the ends of the first and second extension portions are located within the cavity and frictionally contact the object when the fastener grips the object.

13. A fastener for holding an object as claimed in claim 1, further comprising a clasp having a side edge constituting said pin, said first clip arm having a first end with a first extension constituting said coil and coiled around the side edge of the clasp toward the cavity through a central aperture of the clasp to form a rotatable connection; the first end of the second clamping arm is provided with a second extending part which penetrates through the central hole of the buckle towards the cavity direction and winds the other part of the side edge of the buckle; wherein the ends of the first and second extensions are located within the cavity and are in frictional contact with the object when the fastener grips the object.

14. The fastener of claim 13, wherein the loop is a closed or non-closed square loop formed by a strip of material joined end to end and wound with the first or second extension.

15. A fastener for clamping objects according to any one of claims 1 to 14, wherein the clip arm having the winding portion is formed by bending a strip, and the two ends of the strip are wound around the pin side by side to form the winding portion together.

16. A fastener for clamping an object according to any one of claims 1 to 14, wherein the second end of the first clamp arm and the second end of the second clamp arm each have a gap or a seamless slot for the passage of a bolt to secure the second ends of the first and second clamp arms to one another; or,

the second end of the first clamping arm is provided with a first buckle and a through hole communicated with the cavity, one end of the first buckle is provided with a notch or a seamless notch for a bolt to pass through for occlusion, the other end opposite to the first buckle passes through the through hole of the second end of the first clamping arm towards the cavity direction and is wound around the edge of the through hole to form rotatable connection, and the tail end of the other end opposite to the first buckle is positioned in the cavity and is in frictional contact with an object when the fastener clamps the object; and/or the second end of the second clamping arm is provided with a second buckle and a through hole communicated with the cavity, one end of the second buckle is provided with a notch or a seamless notch for a bolt to pass through for clamping, the other end opposite to the second buckle passes through the through hole of the second end of the second clamping arm towards the cavity direction and is wound around the edge of the through hole to form a rotatable connection, and the tail end of the other end opposite to the second buckle is positioned in the cavity and is in frictional contact with an object when the fastener clamps the object; or,

the second end of one of the first clamping arm and the second clamping arm is provided with a notch or a seamless notch for allowing one end of a bolt to pass through for occlusion, or is provided with a first buckle and a through hole communicated with the cavity, one end of the first buckle is provided with a notch or a seamless notch for allowing the bolt to pass through for occlusion, the other end opposite to the first buckle passes through the through hole of the second end of one of the first clamping arm and the second clamping arm towards the cavity direction and is wound around the edge of the through hole to form rotatable connection, and the tail end of the other end opposite to the first buckle is positioned in the cavity and is in frictional contact with an object when the fastener clamps the object; the second end of the other one of the first clamping arm and the second clamping arm is provided with a through hole communicated with the cavity, the tail end of the other end of the bolt penetrates through the through hole of the second end of the other one towards the cavity and is wound around the edge of the through hole to form a rotatable connection, and the tail end of the other end of the bolt is positioned in the cavity and is in frictional contact with an object when the fastener clamps the object; or,

the second end of one of the first clamping arm and the second clamping arm is provided with a self-locking device which comprises a self-locking base, a self-locking rod, a first locking block and a second locking block,

the self-locking base is provided with a cavity, and the side wall of the cavity comprises a first friction contact surface and a fourth friction contact surface;

the self-locking rod is provided with a second friction contact surface and a third friction contact surface, and can extend into the cavity of the self-locking base so that the second friction contact surface faces the first friction contact surface, the third friction contact surface faces the fourth friction contact surface, the first locking block can be movably arranged between the first friction contact surface and the second friction contact surface and is contacted with the first friction contact surface and the second friction contact surface, and the second locking block can be movably arranged between the third friction contact surface and the fourth friction contact surface and is contacted with the third friction contact surface and the fourth friction contact surface; and the number of the first and second groups,

the included angle between the first friction contact surface and the second friction contact surface is alpha, the included angle between the third friction contact surface and the fourth friction contact surface is alpha', and the friction angles of the first lock block relative to the first friction contact surface and the second friction contact surface are respectively alphaAndthe friction angles of the second locking block relative to the third and fourth friction contact surfaces are respectivelyAndwherein,and is

One end of the self-locking rod can be meshed with the second end of the other one of the first clamping arm and the second clamping arm.

17. A fastener for gripping an object according to claim 16, wherein the second end of the other has a hook and a through hole communicating with the object-receiving cavity, one end of the hook has a notch for engaging with one end of the self-locking lever, and the other end opposite to the hook is passed through the through hole of the second end of the other in a direction toward the object-receiving cavity to wrap around the edge of the through hole to form a rotatable connection, and the other end opposite to the hook has a tip end located in the object-receiving cavity and frictionally contacting the object when the fastener grips the object.

18. A fastener for clamping an object according to claim 16, wherein said second end of said one of said first and second clip arms is integrally formed with said self-locking base; or, the second end of the one of the first clamping arm and the second clamping arm is provided with a through hole communicated with the cavity for accommodating the clamped object, the side surface of the self-locking base is provided with a protruding lug part, the tail end of the lug part penetrates through the through hole of the second end of the one towards the cavity for accommodating the clamped object and is wound around the edge of the through hole to form a rotatable connection, and the tail end of the lug part is positioned in the cavity for accommodating the clamped object and is in frictional contact with the object when the fastener clamps the object.

19. The fastener for clamping an object according to claim 16, wherein at least one of said first and second locking pieces terminates outside said cavity and has a flange.

20. A fastener for retaining an object according to claim 16, wherein 0 < α ≦ 17 ° and/or 0 < α' ≦ 17 °.

21. The fastener for clamping objects according to claim 16, wherein said first and fourth frictional contact surfaces are symmetrically disposed with respect to the longitudinal axis of said self-locking base, and said second and third frictional contact surfaces are symmetrically disposed with respect to the longitudinal axis of said self-locking bar such that α ═ α'.

22. A fastener for gripping an object according to claim 16, wherein said first and second locking pieces are slidable along said first and fourth frictional contact surfaces, respectively.

23. The fastener of claim 22, wherein the inner wall of the self-locking base has a first sliding groove or rib for the first locking piece and a second sliding groove or rib for the second locking piece, the first locking piece has a protrusion or sliding groove matching with the first sliding groove or rib, and the second locking piece has a protrusion or sliding groove matching with the second sliding groove or rib.

24. The fastener of claim 16, further comprising an elastic member having one end on the self-locking base and the other end on the locking piece for keeping the locking piece in contact with the self-locking lever;

or, a first elastic part and a second elastic part are arranged in the cavity of the self-locking base, one end of the first elastic part is positioned on the inner wall of the self-locking base, the other end of the first elastic part is positioned on the first locking block and used for keeping the first locking block without separating from the cavity, one end of the second elastic part is positioned on the inner wall of the self-locking base, and the other end of the second elastic part is positioned on the second locking block and used for keeping the second locking block without separating from the cavity.

25. A fastener according to any one of claims 1 to 14, wherein the intermediate portion between the first and second ends of the first clip arm has an opening in communication with the cavity and/or the intermediate portion between the first and second ends of the second clip arm has an opening in communication with the cavity.

26. A fastener for retaining an object according to claim 25, wherein the opening of the intermediate portion is in communication with the through-hole and/or the slit or notch.

27. The fastener of claim 25, wherein the fastener is a construction fastener, the first clip arm is a cover plate and the second clip arm is a base;

or, the fastener is for the building fastener, first arm lock is the base and the second arm lock is the apron.

28. A rotational fastener comprising: a first fastener and a second fastener, the first fastener being the fastener according to any one of claims 1 to 27, the second fastener being the fastener according to any one of claims 1 to 27, wherein the first clamping arm or the second clamping arm of the first fastener and the first clamping arm or the second clamping arm of the second fastener are rotatably connected to form a rotating seat of the rotating fastener.

29. A rotary fastener according to claim 28, wherein the two arms forming the rotary mount are rotatable in a plane perpendicular to the plane of rotation of the first and second arms of said first fastener.

30. A right angle fastener comprising: a first clip according to any one of claims 1 to 27 and a second clip according to any one of claims 1 to 27, wherein the first or second clip arm of the first clip is fixedly connected with the first or second clip arm of the second clip to form a right-angled seat of the right-angled clip, and the rotation planes of the two clip arms forming the right-angled seat are perpendicular to each other.

31. The right angle fastener according to claim 30, wherein each of the clip arms constituting the right angle seat is constituted by a pair of halves disposed opposite each other to constitute a non-closed loop, the two pairs of halves crossing each other and being fixed at the crossing.

32. The right angle fastener of claim 31, wherein the two pairs of halves are secured by welding.