CN219102538U - Fastening device for multi-foot support - Google Patents

Abstract

Embodiments of the present application provide a fastening device for a multi-foot stand, the device comprising: the inner side surface of the helmet main body is provided with a circular accommodating cavity, and the outer side surface of the helmet main body is provided with a plurality of connecting parts; a notch is further formed in one side of the helmet main body, and a first connecting part and a second connecting part which are opposite are arranged on two sides of the notch; and the first fixing structure is used for fixing the first connecting part and the second connecting part and adjusting the interval between the first connecting part and the second connecting part so as to adjust the size of the circular accommodating cavity. According to the technical scheme, the object to be installed (the hemispherical bowl) is installed and locked through adjusting the size of the notch, the structure is simple, the operation is simple and convenient, and the locking effect is good.

Description

Fastening device for multi-foot support

Technical Field

The application relates to the technical field of photographic equipment, in particular to a fastening device of a multi-foot bracket.

Background

At present, photographic hemispherical tripods sold in the market basically have clamping openings which are transversely tangential and provided with notches, and the clamping openings feel insufficient in strength from the practical use effect, so that the clamping force is insufficient.

It should be noted that the foregoing is not necessarily prior art, and is not intended to limit the scope of the patent protection of the present application.

Disclosure of Invention

Embodiments of the present application provide a fastening device for a multi-foot stand to solve or alleviate one or more of the technical problems set forth above.

As one aspect of the embodiments of the present application, the embodiments of the present application provide a fastening device of a multi-foot stand, including:

the inner side surface of the helmet main body is provided with a circular accommodating cavity, and the outer side surface of the helmet main body is provided with a plurality of connecting parts; a notch is further formed in one side of the helmet main body, and a first connecting part and a second connecting part which are opposite are arranged on two sides of the notch;

and the first fixing structure is used for fixing the first connecting part and the second connecting part and adjusting the interval between the first connecting part and the second connecting part so as to adjust the size of the circular accommodating cavity.

Optionally, the slotting direction of the notch is perpendicular to the center of the helmet body.

Optionally, the first fixing structure includes:

the first end of the second screw is used for extending into the first connecting part and the second connecting part;

the second knob is fixedly sleeved at the second end of the second screw and used for receiving external torsion.

Optionally, the second knob includes:

the third screw comprises a screw rod and a screw cap;

the spring is sleeved outside the screw rod;

correspondingly, the second knob is provided with a first fixed cavity, a second fixed cavity and an annular stop block;

the annular stop block is located between the first fixing cavity and the second fixing cavity, the end face, facing the first fixing cavity, of the annular stop block is used for abutting against the second end of the second screw, the annular stop block is used for enabling the third screw to penetrate through to be fixedly connected with the second end of the second screw, and the end face, facing the second fixing cavity, of the annular stop block and the bottom face of the nut abut against the spring.

Optionally, the bowl also comprises a hemispherical bowl; the hemispherical bowl is at least partially fixed in the circular accommodating cavity, and a peripheral groove is formed in the outer wall of the hemispherical bowl;

correspondingly, one side of the helmet main body is also provided with a first threaded hole for the inner side and the outer side of the through helmet main body;

correspondingly, the fastening device further comprises a second fixing structure;

the second fixing structure comprises a first screw and a first knob; one end of the first screw is fixed in the first knob, and the other end of the first screw extends into the first threaded hole;

wherein, when the first knob is at a first angle, the other end of the first screw extends into the Zhou Gou; when the first knob is at a second angle, the other end of the first screw is clear of the Zhou Gou.

Optionally, an arc-shaped groove is formed on the outer side surface of the helmet main body, and surrounds the first threaded hole;

the first knob is provided with a bump;

wherein the projection is defined in the arcuate recess and is slidable along the arcuate recess between the ends thereof.

Optionally, the method further comprises:

the bottom of the hemispherical fixing seat is fixed in the hemispherical bowl, and the top of the hemispherical fixing seat extends out of the hemispherical bowl; wherein the hemispherical fixing seat is provided with a threaded hole column;

the chassis base is fixed at the top of the hemispherical fixing seat; the chassis base is provided with a first through hole;

the pressing plate is positioned below the hemispherical bowl, and the upper edge of the pressing plate abuts against the outer wall of the hemispherical bowl; wherein the compaction plate is provided with a second through hole;

a fourth screw;

the connecting plug is provided with an internal threaded hole at the first end and an external thread at the second end; wherein the first end of the connecting plug is limited in a cavity formed by the pressing disc and the hemispherical bowl;

the hollow pipe is positioned below the pressing disc and is provided with an internal threaded hole;

the second end of the connecting plug extends out of the pressing disc and is screwed and fixed with the hollow tube; the fourth screw sequentially passes through the first through hole of the chassis base and the threaded hole column of the hemispherical fixing seat to enter the internal threaded hole of the connecting plug, so that the fourth screw is respectively screwed and fixed with the threaded hole column of the hemispherical fixing seat and the internal threaded hole of the connecting plug.

Optionally, the method further comprises:

the plastic gasket is sleeved on the inner wall of the hemispherical bowl; wherein the inner ring of the plastic gasket is a first arc-shaped surface;

correspondingly, the outer wall of the hemispherical fixing seat is a second arc-shaped surface, and the second arc-shaped surface is matched with the first arc-shaped surface.

Optionally, the hemispherical bowl is provided with an annular outer wall and a hemispherical base; wherein the annular outer wall abuts against the inner wall of the circular accommodating cavity; the hemispherical base is positioned in the annular outer wall, and the outer wall of the hemispherical base is a third arc-shaped surface;

the shape of the upper edge of the pressing disc is matched with the third arc-shaped surface so as to lock the hemispherical bowl.

Optionally, the device also comprises a sealing ring and a plastic pressing ring; wherein the plastic clamping ring is positioned between the pressing disc and the hollow tube;

correspondingly, the below of compressing tightly the dish is equipped with the recess, be used for placing in the recess the sealing washer this application embodiment adopts above-mentioned technical scheme can include following advantage:

the object to be installed (hemispherical bowl) is installed and locked by adjusting the size of the notch, and the locking device is simple in structure, convenient to operate and good in locking effect.

Drawings

In the drawings, the same reference numerals refer to the same or similar parts or elements throughout the several views unless otherwise specified. The figures are not necessarily drawn to scale. It is appreciated that these drawings depict only some embodiments according to the disclosure and are not therefore to be considered limiting of its scope.

Fig. 1 is a schematic structural view of a fastening device of a multi-foot stand according to an embodiment of the present application.

Fig. 2 is a partial cross-sectional view of an embodiment of the present application.

Fig. 3 is a partially exploded view of an embodiment of the present application.

Fig. 4 is a partially exploded view of the present utility model.

Fig. 5 is a partial cross-sectional view of an embodiment of the present application.

Fig. 6 is a partially exploded view of an embodiment of the present application.

Reference numerals illustrate:

1. helmet main body

2. Semi-sphere bowl

3. Plastic gasket

4. Hemispherical fixing seat

5. Pressing disc

6. Sealing ring

7. Plastic pressing ring

8. Hollow tube

9. Connecting plug

10. Fourth screw

11. Chassis base

12. Gasket ring

13. Notch

14. Second screw

15. Second knob

16. Spring

17. Third screw

18. First screw

19. First knob

20. Screw

21. Accommodating cavity

31. Inner ring

101. Round accommodating cavity

102. Arc-shaped groove

191. Bump block

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The embodiment of the application aims to provide a locking device of a hemispherical tripod, which comprises a protective cap main body notch, wherein a slotting mode of the protective cap main body notch is vertical to the center, and two sides of the notch can be made thicker. The side of the protective cap main body is provided with a knob, one end of the knob fixed multi-head tooth screw rod is provided with a convex step, the protective cap main body is provided with a tooth hole, and the periphery of the tooth hole is provided with a groove with 3/4 circle. The semi-spherical bowl is provided with a containing cavity with a small concave step, a plastic gasket is arranged in the containing cavity, the inner ring of the plastic gasket is an arc surface and is matched with the arc surface of the metal semi-sphere, and the plastic gasket prevents the metal semi-sphere bowl from sounding with the semi-sphere. The side of the protective cap main body is provided with a knob, one end of the knob fixed multi-thread screw rod is provided with a convex step, the protective cap main body is provided with a thread hole, and the periphery of the thread hole is provided with a groove with 3/4 circles. The semi-spherical bowl is provided with a containing cavity with a small concave step, a plastic gasket is arranged in the containing cavity, the inner ring of the plastic gasket is an arc surface and is matched with the arc surface of the metal semi-sphere, and the plastic gasket prevents the metal semi-sphere bowl from sounding with the semi-sphere.

Simple structure, easy and simple to handle, and the locking effect is good.

Hereinafter, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these exemplary embodiments may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

As shown in fig. 1 to 6, the fastening device of the multi-foot stand may include: a helmet main body 1, a hemispherical bowl 2, etc. The helmet body 1 is in a circular shape, the inner side surface of the helmet body is provided with a circular accommodating cavity 101, and the outer side surface of the helmet body is provided with a plurality of connecting parts; a notch 103 is further arranged on one side of the helmet body 1, and a first connecting portion and a second connecting portion which are opposite are arranged on two sides of the notch 103. The first fixing structure is used for fixing the first connecting portion and the second connecting portion, and adjusting the interval between the first connecting portion and the second connecting portion, thereby adjusting the size of the circular accommodating chamber 101.

The object to be installed (the hemispherical bowl 2) is installed and locked by adjusting the size of the notch 103, so that the structure is simple, the operation is simple and convenient, and the locking effect is good.

It should be noted that, the two sides of the notch (the first connecting portion and the second connecting portion) may be made thicker.

In an alternative embodiment, the slotting direction of the notch is perpendicular to the center of the helmet body 1. This structure can increase strength and clamping force.

In an alternative embodiment, the first fixing structure includes a second screw 14 and a second knob 15. The first end of the second screw 14 is adapted to extend into the first connection portion and the second connection portion. The second knob 15 is fixedly sleeved at the second end of the second screw 14 and is used for receiving external torsion. By rotating the second knob 15, the second knob 15 drives the second screw 14 to enable the notch 103 to be contracted, so that the function of clamping the semi-spherical bowl 2 by the helmet main body 1 is achieved.

In an alternative embodiment, the second knob 15 comprises a third screw 17 and a spring 16. The third screw 17 includes a screw rod and a nut. And the spring 16 is sleeved outside the screw. The second knob 15 is provided with a first fixing cavity, a second fixing cavity and an annular stop block. Wherein, the annular stop is located between the first fixed chamber and the second fixed chamber, the terminal surface that faces the first fixed chamber is arranged to lean against the second end of second screw 14 in the annular stop, the annular stop is arranged to pass through by third screw 17 in order to fixed connection the second end of second screw 14, the terminal surface that faces the second fixed chamber in the annular stop and the bottom surface of nut lean against spring 16.

As shown in fig. 3, an elastic body 13 is installed at one side of the gasket 12, a second screw 14 passes through the elastic body 13, the gasket 12 is fixed on the helmet body 1 by a screw thread, and a second knob 15 is installed at the other end of the second screw 14. The spring 16 is installed in the second fixing cavity in the second knob 15, and the third screw 17 is fixed on the second screw 14 through a screw thread, so that the spring 16 can be prevented from being ejected from the second knob 15, and when the second knob 15 rotates to a certain angle to have interference, the second knob 15 is pulled out to swing to a non-interference position. By rotating the second knob 15, the second knob 15 drives the second screw 14 to enable the notch 103 of the helmet main body to be contracted, so that the helmet main body can clamp the hemispherical bowl 2.

In an alternative embodiment, the device further comprises a hemispherical bowl 2. The hemispherical bowl 2 is at least partially fixed in the circular accommodating cavity 101, and a peripheral groove is formed in the outer wall of the hemispherical bowl 2. Correspondingly, a first threaded hole is further formed in one side of the helmet main body 1 and used for penetrating the inner side surface and the outer side surface of the helmet main body 1. Correspondingly, the fastening device further comprises a second fixing structure. The second fixing structure comprises a first screw 18 and a first knob 19; one end of the first screw 18 is fixed in the first knob 19, and the other end of the first screw 18 extends into the first threaded hole.

Wherein, when the first knob 19 is at the first angle, the other end of the first screw 18 extends into the Zhou Gou; when the first knob 19 is at the second angle, the other end of the first screw 18 is away from the Zhou Gou.

As shown in fig. 5 and 6, the first screw hole is provided with the first screw 18, the first screw 18 is a multi-head screw, one end of the multi-head screw may have a protruding step, and the travel of the first screw 18 to the inside of the helmet body 1 may be lengthened. One end of the first screw 18 can extend out of the circular accommodating cavity 101 of the helmet body 1, and the first screw 18 extending out of the helmet body 1 is clamped into the circumferential groove of the hemispherical bowl 2, so that the hemispherical bowl 2 is prevented from falling down when the tripod is turned upside down. The other end of the first screw 18 is fixed with a first knob 19, which is locked and fixed by a screw 20.

In an alternative embodiment, the outer side of the helmet body 1 is provided with an arc-shaped recess 102, said arc-shaped recess 102 surrounding said first threaded hole. The first knob 19 is provided with a projection 191. Wherein the projection 191 is defined in the arc-shaped groove 102 and is slidable along between both ends of the arc-shaped groove 102. The arcuate groove 102 may be a 3/4 turn groove. The protrusion 191 extends into the arc-shaped groove 102 of the helmet body 1 and performs a positioning function when rotated by a certain angle, so as to prevent the first screw 18 from being separated from the first threaded hole due to excessive rotation of the first knob 19.

In an alternative embodiment, the apparatus further comprises: hemispherical fixing seat 4, chassis base 11, compress tightly dish 5, fourth screw 10, connecting plug 9 and hollow tube 8. The bottom of the hemispherical fixing seat 4 is fixed in the hemispherical bowl 2, and the top of the hemispherical fixing seat 4 extends out of the hemispherical bowl 2; wherein, hemisphere fixing base 4 is equipped with the screw hole post. The chassis base 11 is fixed at the top of the hemisphere fixing seat 4, and the chassis base 11 is provided with a first through hole. The pressing disc 5 is positioned below the hemispherical bowl 2, and the upper edge of the pressing disc 5 abuts against the outer wall of the hemispherical bowl 2; wherein, the compressing disc 5 is provided with a second through hole. The connecting plug 9 is provided with an internal threaded hole at a first end and an external thread at a second end of the connecting plug 9; wherein the first end of the connecting plug 9 is confined in a cavity formed by the pressing plate 5 and the hemispherical bowl 2. A hollow tube 8 positioned below the pressing disc 5, wherein the hollow tube 8 is provided with an internal threaded hole; wherein the second end of the connecting plug 9 extends out of the pressing disc 5 and is screwed and fixed with the hollow tube 8; the fourth screw 10 sequentially passes through the first through hole of the chassis base 11 and the threaded hole column of the hemispherical fixing seat 4 to enter the internal threaded hole of the connecting plug 9, so that the fourth screw 10 is respectively screwed and fixed with the threaded hole column of the hemispherical fixing seat 4 and the internal threaded hole of the connecting plug 9.

In an alternative embodiment, the device may further comprise a plastic gasket 3. The plastic gasket 3 is sleeved on the inner wall of the hemispherical bowl 2; wherein, the inner ring 31 of the plastic gasket 3 is a first arc surface. Correspondingly, the outer wall of the hemispherical fixing seat 4 is a second arc-shaped surface, and the second arc-shaped surface is matched with the first arc-shaped surface. The structure provided by this embodiment can alleviate and prevent the possible rattle that produces of friction between metallic hemisphere bowl 2 and hemisphere fixing base 4.

In an alternative embodiment, the hemispherical bowl 2 is provided with an annular outer wall and a hemispherical base; wherein the annular outer wall abuts against the inner wall of the circular receiving chamber 101; the hemispherical base is positioned in the annular outer wall, and the outer wall of the hemispherical base is a third arc-shaped surface; the shape of the upper edge of the pressing disc 5 is matched with the third arc-shaped surface so as to lock the hemispherical bowl 2. The structure provided by the embodiment can enable the straight surface of the inner cavity of the pressing disc 5 to be matched with the cambered surface of the inner cavity of the lower part of the hemispherical bowl 2, thereby playing a role in locking the hemispherical bowl 2.

A hemispherical bowl 2 is arranged in the circular accommodating cavity 101 of the helmet main body 1. The hemispherical bowl 2 is internally provided with a containing cavity 21. The inner wall of the accommodating cavity 21 is provided with a plastic gasket 3, the inner ring of the plastic gasket 3 is cambered, the plastic gasket 3 is matched with the hemispherical fixing seat 4, the upper end of the hemispherical fixing seat 4 is provided with a chassis base 11, and the chassis base 11 is fixed on the hemispherical fixing seat 4 through a fourth screw 10 and other screws (not marked) by screw threads. The hollow pipe 8 is provided with a pressing disc 5, a small groove is arranged below the pressing disc 5, a sealing ring 6 is arranged in the groove, a plastic pressing ring 7 is arranged below the pressing disc 5, and the pressing ring is fixed on the hollow pipe 8 through a connecting plug 9 and a screw thread passing through an inner hole of a part as shown in figure 1. Through the screw thread cooperation of connecting plug 9 and fourth screw 10, rotate hollow tube 8 and drive the clamp plate 5 and upwards move, the inner chamber straight face of clamp plate 5 cooperates with the lower part inner chamber cambered surface of hemisphere bowl 2 to play locking hemisphere fixing base 4's effect.

In an alternative embodiment, the device may further comprise a sealing ring 6 and a plastic clamping ring 7; wherein the plastic clamping ring 7 is positioned between the clamping disk 5 and the hollow tube 8; correspondingly, a groove is arranged below the pressing disc 5, and the groove is used for placing the sealing ring 6. As shown in fig. 2 and 4, the hollow tube 8 is provided with a pressing disc 5, a groove is arranged below the pressing disc 5, a sealing ring 6 is arranged in the groove, a plastic pressing ring 7 is arranged below the pressing disc 5, and the pressing disc is fixed on the hollow tube 8 by threads through an inner hole of a connecting plug 9 penetrating through a part, so that the hemispherical fixing seat 4 is locked.

The utility model discloses a locking device of a hemispherical tripod, which comprises a protective cap main body, wherein a slotting mode of a notch of the protective cap main body is vertical to the center, and two sides of the notch can be made thicker. The side of the protective cap main body is provided with a knob, one end of the knob fixed multi-head tooth screw rod is provided with a convex step, the protective cap main body is provided with a tooth hole, and the periphery of the tooth hole is provided with a groove with 3/4 circle. The semi-spherical bowl is provided with a containing cavity with a small concave step, a plastic gasket is arranged in the containing cavity, the inner ring of the plastic gasket is an arc surface and is matched with the arc surface of the metal semi-sphere, and the plastic gasket prevents the metal semi-sphere bowl from sounding with the semi-sphere. Simple structure, easy and simple to handle, and the locking effect is good.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

For ease of description, directional terms such as "front, rear, upper, lower, left, right", "transverse, vertical, horizontal" and "top, bottom" etc. refer to a direction or positional relationship generally based on that shown in the drawings, and merely for convenience of description and simplicity of description, these directional terms do not indicate or imply that the apparatus or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly, as they may be fixed, removable, or integral, for example; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

Unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both first and second features being in direct contact, and may also include both first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

It should also be noted that references in the specification to "one embodiment," "another embodiment," "an embodiment," etc., indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally in the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the utility model as set forth in connection with other embodiments.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

It should be further noted that the foregoing is only a preferred embodiment of the present application, and is not intended to limit the scope of the patent protection of the present application, and all equivalent structures or equivalent process changes made by the content of the present application and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the patent protection of the present application.

Claims (10)

1. A fastening device for a multi-legged support, comprising:

a protective cap main body (1) with a circular accommodating cavity (101) on the inner side surface and a plurality of connecting parts on the outer side surface; a notch (103) is further formed in one side of the helmet main body (1), and a first connecting part and a second connecting part which are opposite are arranged on two sides of the notch (103);

and a first fixing structure for fixing the first and second connection parts and for adjusting a space between the first and second connection parts, thereby adjusting a size of the circular receiving chamber (101).

2. The fastening device of a multi-legged support according to claim 1, wherein:

the slotting direction of the notch is vertical to the center of the helmet main body (1).

3. The fastening device of a multi-foot bracket according to claim 1, wherein the first securing structure comprises:

a second screw (14), a first end of the second screw (14) being adapted to extend into the first connection portion and the second connection portion;

and the second knob (15) is fixedly sleeved at the second end of the second screw (14) and is used for receiving external torsion.

4. A fastening device of a multi-foot bracket according to claim 3, characterized in that the second knob (15) comprises:

a third screw (17) comprising a threaded rod and a nut;

a spring (16) sleeved outside the screw;

correspondingly, the second knob (15) is provided with a first fixed cavity, a second fixed cavity and an annular stop block;

the annular stop is located between the first fixing cavity and the second fixing cavity, the end face of the annular stop facing the first fixing cavity is used for abutting against the second end of the second screw (14), the annular stop is used for the third screw (17) to penetrate through to fixedly connect the second end of the second screw (14), and the end face of the annular stop facing the second fixing cavity and the bottom face of the nut abut against the spring (16).

5. The fastening device of a multi-foot stand according to claim 1, further comprising a hemispherical bowl (2); the hemispherical bowl (2) is at least partially fixed in the circular accommodating cavity (101), and a peripheral groove is formed in the outer wall of the hemispherical bowl (2);

correspondingly, one side of the helmet main body (1) is also provided with a first threaded hole for the inner side surface and the outer side surface of the through helmet main body (1);

correspondingly, the fastening device further comprises a second fixing structure;

the second fixing structure comprises a first screw (18) and a first knob (19); one end of the first screw (18) is fixed in the first knob (19), and the other end of the first screw (18) extends into the first threaded hole;

wherein, when the first knob (19) is at a first angle, the other end of the first screw (18) extends into the Zhou Gou; when the first knob (19) is at a second angle, the other end of the first screw (18) leaves the Zhou Gou.

6. The fastening device of a multi-legged support according to claim 5, wherein,

an arc-shaped groove (102) is formed in the outer side face of the helmet main body (1), and the arc-shaped groove (102) surrounds the first threaded hole;

the first knob (19) is provided with a lug (191);

wherein the projection (191) is defined in the arcuate groove (102) and is slidable along between both ends of the arcuate groove (102).

7. The fastening device of a multi-foot bracket according to claim 6, further comprising:

the hemispherical bowl comprises a hemispherical fixing seat (4), wherein the bottom of the hemispherical fixing seat (4) is fixed in the hemispherical bowl (2), and the top of the hemispherical fixing seat (4) extends out of the hemispherical bowl (2); wherein the hemispherical fixing seat (4) is provided with a threaded hole column;

the chassis base (11) is fixed at the top of the hemispherical fixing seat (4); the chassis base (11) is provided with a first through hole;

the pressing plate (5) is positioned below the hemispherical bowl (2), and the upper edge of the pressing plate (5) abuts against the outer wall of the hemispherical bowl (2); wherein the compaction disc (5) is provided with a second through hole;

a fourth screw (10);

the connecting plug (9) is provided with an internal threaded hole at the first end and an external thread at the second end; wherein the first end of the connecting plug (9) is limited in a cavity formed by the pressing disc (5) and the hemispherical bowl (2);

the hollow pipe (8) is positioned below the pressing disc (5), and the hollow pipe (8) is provided with an internal threaded hole;

the second end of the connecting plug (9) extends out of the pressing disc (5) and is screwed and fixed with the hollow tube (8); the fourth screw (10) sequentially passes through the first through hole of the chassis base (11) and the threaded hole column of the hemispherical fixing seat (4) to enter the internal threaded hole of the connecting plug (9), so that the fourth screw (10) is respectively screwed and fixed with the threaded hole column of the hemispherical fixing seat (4) and the internal threaded hole of the connecting plug (9).

8. The fastening device of a multi-foot bracket according to claim 7, further comprising:

a plastic gasket (3) sleeved on the inner wall of the hemispherical bowl (2); wherein the inner ring of the plastic gasket (3) is a first arc-shaped surface;

correspondingly, the outer wall of the hemispherical fixing seat (4) is a second arc-shaped surface, and the second arc-shaped surface is matched with the first arc-shaped surface.

9. The fastening device for a multi-legged support according to claim 7, wherein:

the hemispherical bowl (2) is provided with an annular outer wall and a hemispherical base; wherein the annular outer wall abuts against an inner wall of the circular receiving chamber (101); the hemispherical base is positioned in the annular outer wall, and the outer wall of the hemispherical base is a third arc-shaped surface;

the shape of the upper edge of the pressing disc (5) is matched with the third arc-shaped surface so as to lock the hemispherical bowl (2).

10. The fastening device of a multi-foot bracket according to claim 7, further comprising a sealing ring (6) and a plastic clamping ring (7); wherein the plastic clamping ring (7) is positioned between the clamping disk (5) and the hollow tube (8);

correspondingly, a groove is arranged below the pressing disc (5), and the sealing ring (6) is placed in the groove.

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