CN210539949U - Rotary check structure and chair backrest table - Google Patents

Abstract

The utility model discloses a rotate and end contrary structure and table chair back table, rotate and end contrary structure and include: the mounting seat is internally provided with a rotating groove and a sliding groove communicated with the rotating groove; the rotating shaft is rotatably arranged in the rotating groove, at least two groups of ratchet parts are arranged on the outer wall of the rotating shaft along the circumferential direction, each group of ratchet parts comprises at least one ratchet, and the ratchet directions of the ratchet parts are consistent; the limiting shaft can be arranged in the sliding groove in an axial sliding manner, one end of the limiting shaft is abutted against the outer wall of the rotating shaft and is provided with a convex tooth matched with the ratchet for stopping and limiting the rotation; one end of the strong spring is connected with the limit shaft in a butting mode, and the other end of the strong spring is connected with the bottom of the sliding groove in a butting mode. The chair backrest table is rotatably arranged at the back side of the chair backrest and is of an upturning opening type structure; which comprises a desk plate and two rotation non-return structures. By adopting the technical scheme, the upturning opening type small table plate can be obtained, the table plate is pressed to the lowest position when being folded, the applicable backrest type is wider, and the non-return function is reliable when the table plate is used.

Description

Rotary check structure and chair backrest table

Technical Field

The utility model relates to a technical field of little table behind the seat back, concretely relates to rotate and end contrary structure and seat back table.

Background

Most of the existing small table plate of the seat backrest is of a downward-turning open type structure, namely when the small table plate needs to be used, the small table plate needs to be rotated downwards to be in a horizontal position for use; however, the small table board with the structure is not suitable for the backrest with a short height, and the probability of the condition of limited use is high, so that the requirement is not easy to meet.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned defect or the problem that exist among the background art, provide a rotate and end contrary structure and seat back seat, can obtain a section and turn over open-type little table through adopting above-mentioned technical scheme, it pushes down to the extreme low position when packing up, and the back type that is suitable for is wider, and end contrary function during the use is reliable.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a rotary backstop structure comprising: the mounting seat is internally provided with a rotating groove and a sliding groove communicated with the rotating groove; the rotating shaft is rotatably arranged in the rotating groove, at least two groups of ratchet parts are arranged on the outer wall of the rotating shaft along the circumferential direction, each group of ratchet parts comprises at least one ratchet, and the ratchet directions of the ratchet parts are consistent; the limiting shaft can be arranged in the sliding groove in an axial sliding manner, one end of the limiting shaft is abutted against the outer wall of the rotating shaft and is provided with a convex tooth matched with the ratchet for stopping and limiting the rotation; one end of the strong spring is connected with the limit shaft in a butting mode, and the other end of the strong spring is connected with the bottom of the sliding groove in a butting mode.

Furthermore, the angle of rotation between each ratchet part of the outer wall of the rotating shaft relative to the circle center is 90-180 degrees.

Furthermore, one side of the limiting shaft, which is used for being abutted against the strong spring, is provided with a positioning hole for placing the end part of the strong spring.

A chair backrest table is rotatably arranged at the back side of a chair backrest and is of an upturned opening type structure; comprises a desk plate and two rotation non-return structures; horizontal hinged shafts are symmetrically arranged on two sides of the table plate; the hinged shaft is in rotation stopping connection with the rotating shaft; the mounting seat is fixedly connected to the back side of the seat back; two groups of ratchet parts are arranged on the outer wall of the rotating shaft; the ratchet part and the convex teeth are matched and abutted when the table plate rotates downwards to the retracted position; the ratchet part and the convex teeth are matched and abutted when the table plate rotates upwards to the horizontal position, and the ratchet limiting surface of the ratchet part is abutted with the convex teeth in a limiting manner so as to limit the downward rotation of the table plate relative to the mounting seat.

Further, the angle of rotation of the table from the stowed position upwards to the horizontal position is 90-130 °.

Further, the mounting seat comprises a shell and a bottom cover detachably and fixedly connected with the shell; the shell is provided with an inner cavity; the inner cavity and one side of the bottom cover facing the inner cavity are matched to form the rotating groove and the sliding groove.

Furthermore, a slide way extending along the sliding direction of the limiting shaft is arranged on the groove wall of the sliding groove of the shell; the limiting shaft is provided with a strip-shaped bulge in sliding connection with the slide way.

Furthermore, the side walls of two sides of the shell are provided with limiting bulges so as to limit the bottom cover from falling out of the shell; one end of the bottom cover is provided with a hook-shaped limiting part, and the limiting part is abutted against the limiting bulge so as to limit the sliding of the bottom cover relative to the shell; the other end of the bottom cover is fixedly connected with the shell through screws.

Further, when the bottom cover is fixedly connected to the shell in place, the outer surface of the bottom cover is flush with the outer surface of the shell.

As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:

1. among this technical scheme, can overcome powerful spring axial displacement under pivoted butt when the axis of rotation is rotatory to the spacing axle of in-process of another ratchet part along the direction of orientation of ratchet, when the next ratchet part on the axis of rotation and spacing epaxial dogtooth cooperation target in place, spacing axle reliably resets under powerful spring's butt, at this moment, if apply a reverse rotation's effort to the axis of rotation, epaxial ratchet can form spacing cooperation with the dogtooth, and powerful spring's butt effect, can guarantee that the pivot can bear great reverse rotation's effort, the contrary effect of pivot is reliable, consequently, this rotation is prevented contrary structure and is applicable to the switching that has two or more rotation states and wherein at least one state need possess the product of rotatory contrary function of stopping.

2. The angle of rotation between each ratchet part on the outer wall of the rotating shaft relative to the circle center is 90-180 degrees, the adjustable range is large, and the use requirements of different products can be met.

3. Through setting up the locating hole to the tip that supplies powerful spring is put into, can improve powerful spring's stability correspondingly, avoids it to take place the skew and function failure.

4. The rotation connecting structure between the table plate and the backrest in the seat backrest table in the technical scheme adopts the rotation non-return structure, and can meet the requirement that the table plate is rotatably arranged at the back side of the backrest downwards in a folded state, so that the table plate can be suitable for the backrest with a short height, and the condition that the use experience of a user is influenced because the upper end of the table plate extends out of the upper end of the backrest when the table plate is folded is avoided; when the table plate rotates upwards from a folded state to a horizontal state, the rotating shaft has a larger rotation non-return function due to the limiting action of the ratchets on the rotating shaft and the convex teeth on the limiting shaft and the elastic abutting action of the strong spring, so that the table plate in the technical scheme has stronger bearing capacity, simple structure and reliable function; when the table among this technical scheme was applied to rotatory upwards for the state of packing up, then, when the table down rotates to the horizontality from the top, it did not possess contrary function, and the table then can't bear the weight of.

5. The angle of the rotation of the table plate from the folding position to the horizontal position is 90-130 degrees, so that the angle of the rotation of the two ratchet parts on the corresponding rotating shafts relative to the circle center is also 90-130 degrees, so as to meet the requirement that the lower part of the back side of some backrests is inclined and arranged obliquely.

6. The mounting seat comprises a shell and a bottom cover detachably fixedly connected with the shell, and is simple in structure and convenient to assemble and disassemble.

7. Through the arrangement of the slide way and the strip-shaped bulges matched with the slide way, the limiting shaft can be reliably positioned and slide into the inner cavity of the shell during installation, and the installation is simpler and more convenient.

8. The bottom cover is simple in mounting structure on the shell and good in stability.

9. When the bottom cover is fixedly connected to the shell in place, the outer surface of the bottom cover is flush with the outer surface of the shell, so that the attractiveness of the structure is guaranteed, and the fitting degree of the shell and the seat backrest is better.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic perspective exploded view of a seat back table according to an embodiment of the present invention;

fig. 2 is a schematic perspective exploded view of a rotary non-return structure according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a housing in an embodiment of the present invention;

fig. 4 is a schematic structural view of the table in the retracted state according to the embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view taken along line D-D of FIG. 4;

fig. 6 is a schematic structural view of the table in the embodiment of the present invention in an opened state;

fig. 7 is a schematic cross-sectional view taken along the direction D-D in fig. 6.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are preferred embodiments of the invention and should not be considered as excluding other embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.

In the claims, the specification and the drawings, unless otherwise expressly limited, the terms "first," "second," or "third," etc. are used for distinguishing between different elements and not for describing a particular sequence.

In the claims, the specification and the drawings, unless otherwise expressly limited, to the extent that directional terms such as "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise" and the like are used, the positional or orientational relationships illustrated in the drawings are based on the positional and orientational relationships illustrated in the drawings and are merely for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the present invention in any way.

In the claims, the description and the drawings of the present application, unless otherwise expressly limited, the term "fixedly connected" or "fixedly connected" is used, which is to be understood broadly, that is, any connection mode without displacement relation or relative rotation relation between the two, that is, including non-detachably fixed connection, integrated connection and fixed connection through other devices or elements.

In the claims, the specification and the drawings, the terms "including", "comprising" and variations thereof, if used, are intended to be inclusive and not limiting.

In the claims, the description and the drawings of the present application, the term "rotation reversal stop" is used, which is defined to provide a resistance to a reverse rotation relative to a normal direction.

Referring to fig. 1 to 7, fig. 1 to 7 show a rotary non-return structure and a schematic structural view of the rotary non-return structure applied to a seat back table according to an embodiment of the present invention. As shown in fig. 1 to 7, an embodiment of the present invention provides a rotation check structure, which includes a mounting base 1, a rotating shaft 2, a limiting shaft 3 and a strong spring 4.

Wherein, the mounting seat 1 is provided with a rotating groove 101 and a sliding groove 102 communicated with the rotating groove 101.

The rotating shaft 2 is rotatably installed in the rotating groove 101, at least two sets of ratchet portions 21 are arranged on the outer wall of the rotating shaft in the circumferential direction, each set of ratchet portions 21 includes at least one ratchet 211, and the directions of the ratchets 211 of the ratchet portions 21 are consistent. Preferably, the rotation angle between each ratchet part 21 on the outer wall of the rotating shaft 2 relative to the circle center is 90-180 degrees, and the adjustable range is large, so that the use requirements of different products can be met.

The limit shaft 3 is installed in the sliding groove 102 in an axially sliding manner, and one end of the limit shaft abuts against the outer wall of the rotating shaft 2 and is provided with a convex tooth 31 which is matched with the ratchet 211 to limit the limit by non-return. Therefore, it should be understood that the convex tooth 31 does not generate a limit abutting action with the ratchet 211 on the rotating shaft 2 when the rotating shaft 2 rotates in the normal direction, and the convex tooth 31 can perform a limit abutting action with the limit surface side of the ratchet 211 on the rotating shaft 2 during the rotation of the rotating shaft 2 in the reverse direction to limit the rotation of the rotating shaft 2 in the reverse direction.

One end of the strong spring 4 is connected with the limit shaft 3, and the other end is connected with the bottom of the sliding groove 102; that is, the strong spring 4 is used to abut against the limiting shaft 3, so that the end of the limiting shaft provided with the convex teeth 31 abuts against the outer surface of the rotating shaft 2, thereby improving the acting force of non-return. Preferably, in the present embodiment, a positioning hole 32 is provided on a side of the limiting shaft 3 for abutting against the strong spring 4, and the positioning hole 32 is used for inserting an end of the strong spring 4, so as to improve the stability of the strong spring 4 and avoid deflection and functional failure thereof.

In the technical scheme, when the rotating shaft rotates from one ratchet part 21 to another ratchet part 21 along the guide direction of the ratchet 211, the axial movement of the strong spring 4 can be overcome by the limiting shaft 3 under the rotating butting until the next ratchet part 21 on the rotating shaft is matched with the convex teeth 31 on the limiting shaft 3 in place, the limiting shaft 3 can reliably reset under the butting of the strong spring 4, at the moment, if a reverse rotation acting force is applied to the rotating shaft, the ratchet 211 on the rotating shaft 2 can form the limiting matching with the convex teeth 31, and the butting action of the strong spring 4 can ensure that the rotating shaft 2 can bear a larger reverse rotation acting force, and the non-return effect of the rotating shaft 2 is reliable, so that the rotating non-return structure is suitable for a product which has two or more rotation states and at least one state of which needs to have the rotating non-return function.

The embodiment of the present invention provides a seat back table, which can be rotatably installed at the back side of the seat back and is of an upturning open type structure, that is, the seat back table is folded up by rotating the free end downwards, and opened by rotating the table plate 100 upwards from the lower part; the seat back table includes a table plate 100 and two of the above-described rotary backstop structures.

Specifically, horizontal hinge shafts 1001 are symmetrically arranged on two sides of the table board 100, and the hinge shafts 1001 are in rotation stopping connection with the rotating shaft 2; in this embodiment, the outer wall of the hinge shaft 1001 extending from both sides of the table 100 is provided with a plane parallel to the axis, the inside of the rotating shaft 2 is coaxially provided with an insertion hole for inserting the hinge shaft 1001, and the inner wall of the insertion hole is provided with a corresponding plane matched with the plane on the outer wall of the hinge shaft 1001 for rotation stopping; preferably, the hinge shaft 1001 in this embodiment is detachably mounted on the table 100, and has a flat structure with a square cross section.

The mounting seat 1 is disposed at the back side of the seat back, and two ratchet portions 21 are disposed on the outer wall of the rotating shaft 2 in this embodiment.

Specifically, the ratchets 211 in the two ratchet parts 21 are respectively used for matching with the convex teeth 31 on the limiting shaft 3 in the table board 100 folding state and the table board 100 opening state; specifically, the engagement of the ratchet portion 21 and the protruding tooth 31 is configured to be in mating abutment when the table 100 is rotated downward to the stowed position; the ratchet part 21 and the convex teeth 31 are matched and abutted when the table plate 100 rotates upwards to the horizontal position, and the ratchet 211 limiting surface of the ratchet part 21 is in limiting and abutting contact with the convex teeth 31 to limit the downward rotation of the table plate 100 relative to the mounting seat 1.

Preferably, in order to meet the requirement of the shape of the backrest rear side inclination, in the present embodiment, the angle of rotation of the table board 100 from the stowed position to the horizontal position is 90 to 130 °, and therefore, the angle of rotation of the two ratchet parts 21 on the corresponding rotating shaft 2 relative to the center of the circle is also 90 to 130 °, so as to meet the requirement that some backrest rear side lower parts are inclined and arranged in an inclined manner.

Specifically, in the present embodiment, the mounting base 1 includes a housing 11 and a bottom cover 12 detachably and fixedly connected to the housing 11; an inner cavity is formed in the shell 11, the inner cavity and one side, facing the inner cavity, of the bottom cover 12 are matched to form the rotating groove 101 and the sliding groove 102, namely, the rotating groove 101 and the sliding groove 102 are formed by matching the bottom cover 12 and the shell 11 after being fixedly connected, the rotating shaft 2 and the limiting shaft 3 are convenient to assemble and disassemble; in this embodiment, the side walls of the two sides of the housing 11 are provided with limiting protrusions 112 to limit the bottom cover 12 from coming off the housing 11; one end of the bottom cover 12 is provided with a hook-shaped limiting part 121, and the limiting part 121 is abutted against the limiting bulge 112 to limit the sliding of the bottom cover 12 relative to the shell 11; the other end of the bottom cover 12 is fixedly connected to the housing by screws, specifically, the bottom cover 12 is provided with the above-mentioned limiting portion 121 at an end close to the sliding slot 102 matched with the inner cavity, the limiting portion 121 is limited in the housing 11 by the limiting protrusion 112, and can neither be pulled out of the outer box nor slide relative to the housing 11, and then the other end of the bottom cover 12 is fixedly connected to the housing 11 by screws, thereby completing the assembly of the housing 11 and the bottom cover 12.

In this embodiment, the casing 11 is provided with a slideway 111 extending along the sliding direction of the limiting shaft 3 at the groove wall of the sliding groove 102; the limiting shaft 3 is provided with a strip-shaped bulge 33 which is in sliding connection with the slide rail 111, so that the limiting shaft 3 can be reliably positioned and slide into the inner cavity of the shell 11 during installation, and the installation is simpler and more convenient. When the bottom cover 12 is fixedly connected to the housing 11, the outer surface of the bottom cover is flush with the outer surface of the housing 11, so that the aesthetic degree of the structure is ensured, and the fitting degree of the housing 11 and the seat back is better.

In order to fixedly connect the mounting base 1 to the backrest, in this embodiment, the housing 11 is provided with a mounting portion, and the mounting portion is provided with at least two connecting through holes for the screw to pass through, so as to fixedly connect the mounting base 1 to the backrest.

In the embodiment of the utility model, when the seat back table is actually installed, the limiting shaft 3 is sleeved with the strong spring 4 and then is arranged at the corresponding position of the inner cavity of the shell 11, the strip-shaped bulge 33 on the limiting shaft 3 is matched and spliced with the slide rail 111 in the shell 11, then the rotating shaft 2 is arranged at the corresponding position of the inner cavity of the shell 11, and the convex tooth 31 is matched and butted with the ratchet 211 of one ratchet part 21; sliding the bottom cover 12 into the inner cavity along the axis of the limiting shaft 3, wherein one end of the bottom cover provided with the limiting part 121 passes through the limiting bulge 112 and is abutted against the limiting bulge 112, and the bottom cover 12 is limited at the inner side of the limiting bulge 112; fixedly connecting the other end of the bottom cover 12 to the shell 11 through a screw; selecting two rotation non-return structures, and respectively inserting the rotation non-return structures into the hinge shafts 1001 on two sides of the table plate 100 in a rotation stopping manner; then, the housing 11 is fixedly connected to the rear side of the seat back, and during the assembly process, it should be ensured that the table 100 has a load-bearing function when the table 100 is in the retracted position, the free end of the table 100 faces downward, and when the table 100 is in the open position.

This seat back table is when in-service use, when the in-process of opening the position to the level with table 100 from down and go up, articulated shaft 1001 drives pivot 2 and rotates, pivot 2 rotates ground in-process, powerful spring 4's elastic motion can be overcome to spacing axle 3, when table 100 is rotatory to opening the position, spacing epaxial protruding tooth 31 of 3 just with the spacing butt of the epaxial ratchet 211 of pivot 2, at this moment, under powerful spring 4's powerful butt, the cooperation between pivot 2 and the spacing axle 3 is firm, therefore, table 100 has been guaranteed to have certain bearing capacity, only under the condition that great power was applyed to the staff, just can guarantee that table 100 can pack up the position in the condition of atress in the rotation again.

The rotation connecting structure between the table plate 100 and the backrest in the seat backrest table in the technical scheme adopts the rotation non-return structure, and can meet the requirement that the table plate 100 is rotatably and downwards arranged at the back side of the backrest in a folding state, so that the table plate 100 can be suitable for the backrest with a shorter height, and the condition that the use experience of a user is influenced because the upper end of the table plate 100 extends out of the upper end of the backrest when the table plate 100 is folded is avoided; when the table board 100 rotates upwards from the retracted state to the horizontal state, the ratchet 211 on the rotating shaft 2, the limiting effect of the convex teeth 31 on the limiting shaft 3 and the elastic abutting effect of the strong spring 4 can enable the rotating shaft 2 to have a larger rotation non-return function, so that the table board 100 in the technical scheme has stronger bearing capacity, simple structure and reliable function; it should be noted that, when the table 100 in the present technical solution is applied to rotate upward to be in the retracted state, then, when the table 100 rotates from top to bottom to the horizontal state, it does not have a non-return function, and the table 100 cannot bear load.

Synthesize above analysis, the utility model discloses a technical scheme has solved all technical problem that the specification lists, has realized corresponding technological effect.

The description of the above specification and examples is intended to illustrate the scope of the invention, but should not be construed as limiting the scope of the invention. Modifications, equivalents and other improvements which may be made to the embodiments of the invention or to some of the technical features thereof by a person of ordinary skill in the art through logical analysis, reasoning or limited experimentation in light of the above teachings of the invention or the above embodiments are intended to be included within the scope of the invention.

Claims (9)

1. A rotation backstop structure is characterized by comprising:

the mounting seat is internally provided with a rotating groove and a sliding groove communicated with the rotating groove;

the rotating shaft is rotatably arranged in the rotating groove, at least two groups of ratchet parts are arranged on the outer wall of the rotating shaft along the circumferential direction, each group of ratchet parts comprises at least one ratchet, and the ratchet directions of the ratchet parts are consistent;

the limiting shaft can be arranged in the sliding groove in an axial sliding manner, one end of the limiting shaft is abutted against the outer wall of the rotating shaft and is provided with a convex tooth matched with the ratchet for stopping and limiting the rotation;

one end of the strong spring is connected with the limit shaft in a butting mode, and the other end of the strong spring is connected with the bottom of the sliding groove in a butting mode.

2. A rotary backstop structure as recited in claim 1 wherein: the angle of rotation between each ratchet part of the outer wall of the rotating shaft relative to the circle center is 90-180 degrees.

3. A rotary backstop structure as recited in claim 1 wherein: one side of the limiting shaft, which is used for being abutted against the strong spring, is provided with a positioning hole for placing the end part of the strong spring.

4. A chair backrest table is rotatably arranged at the back side of a chair backrest and is of an upturned opening type structure; the method is characterized in that: comprising a table and two rotation-checking structures according to claim 1, 2 or 3;

horizontal hinged shafts are symmetrically arranged on two sides of the table plate; the hinged shaft is in rotation stopping connection with the rotating shaft; the mounting seat is fixedly connected to the back side of the seat back; two groups of ratchet parts are arranged on the outer wall of the rotating shaft;

the ratchet part and the convex teeth are matched and abutted when the table plate rotates downwards to the retracted position; the ratchet part and the convex teeth are matched and abutted when the table plate rotates upwards to the horizontal position, and the ratchet limiting surface of the ratchet part is abutted with the convex teeth in a limiting manner so as to limit the downward rotation of the table plate relative to the mounting seat.

5. A seat back table as claimed in claim 4, wherein: the angle of rotation of the table from the stowed position upwardly to the horizontal position is 90-130 °.

6. A seat back table as claimed in claim 4 or 5, wherein: the mounting seat comprises a shell and a bottom cover which is detachably and fixedly connected with the shell; the shell is provided with an inner cavity; the inner cavity and one side of the bottom cover facing the inner cavity are matched to form the rotating groove and the sliding groove.

7. A seat back table as claimed in claim 6, wherein: the shell is provided with a slide way extending along the sliding direction of the limiting shaft at the groove wall of the sliding groove; the limiting shaft is provided with a strip-shaped bulge in sliding connection with the slide way.

8. A seat back table as claimed in claim 6, wherein: the side walls of the two sides of the shell are provided with limiting bulges so as to limit the bottom cover from falling out of the shell; one end of the bottom cover is provided with a hook-shaped limiting part, and the limiting part is abutted against the limiting bulge so as to limit the sliding of the bottom cover relative to the shell; the other end of the bottom cover is fixedly connected with the shell through screws.

9. A seat back table as claimed in claim 8, wherein: when the bottom cover is fixedly connected to the shell in place, the outer surface of the bottom cover is flush with the outer surface of the shell.

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