Locking mechanism for center shaft of photography tripod

Abstract

The utility model provides a locking mechanism for a center shaft of a photography tripod. The locking mechanism comprises a center shaft assembly and a pressing block assembly arranged close to the center shaft assembly. The driving mechanism acts on the pressing block assembly to achieve locking of the middle shaft assembly, the pressing block assembly forms a pressing space, the pressing space is widened under the action of external force, and then the pressing force of the pressing block assembly on the middle shaft assembly is adjusted. According to the utility model, external force acts on the pressing block assembly, so that the pressing space of the pressing block assembly is adjusted, and the pressing block assembly is close to the middle shaft assembly, so that the pressing block assembly generates certain pressing force, and the problem that the locking force is reduced due to abrasion of the locking mechanism is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of locking and adjusting the central axis of a photographic tripod, in particular to a locking mechanism for the central axis of a photographic tripod. Background Art

[0002] In the prior art, due to long-term use, the locking mechanism of the photography tripod is easily worn out, and the locking force is reduced, which seriously affects the user experience of photography enthusiasts. At this time, the locking of the central axis needs to be fine-tuned, and then the adjustment between it and the locking mechanism, or the mechanism generating the locking force, is made to overcome the problem of reduced locking force. Utility Model Content

[0003] The utility model aims to provide a locking mechanism for the central axis of a photographic tripod, which acts on a pressure block assembly to adjust its clamping space, so that the pressure block assembly is close to the central axis assembly to generate a certain clamping force, thereby compensating for the problem of reduced locking force caused by wear of the locking mechanism.

[0004] In order to achieve the above-mentioned purpose, the utility model is implemented through the following technical solutions.

[0005] A locking mechanism for the center axis of a photographic tripod, comprising:

[0006] Middle shaft assembly,

[0007] A pressing block assembly disposed adjacent to the center shaft assembly;

[0008] The driving mechanism acts on the pressing block assembly to lock the central axis assembly. The pressing block assembly forms a clamping space. Under the action of external force, the clamping space becomes wider, thereby adjusting the clamping force of the pressing block assembly on the central axis assembly.

[0009] Furthermore, the pressing block assembly includes at least two pressing blocks respectively close to the driving mechanism and the central axis assembly, and at least a force-bearing inclined surface is provided in the two pressing blocks.

[0010] Furthermore, from the driving mechanism toward the central axis assembly, the pressure block assembly includes an outer pressure block, a fine-tuning block and an inner pressure block, and the outer pressure block, the fine-tuning block and the inner pressure block are in contact with each other to form the force-bearing inclined surface.

[0011] Furthermore, the inner pressure block forms a semi-enclosed cavity with an opening toward the fine-tuning block, and the fine-tuning block is partially located in the semi-enclosed cavity.

[0012] Furthermore, from top to bottom, the fine-tuning block forms an inclined contact surface that is inclined away from the outer pressure block.

[0013] Further, the inner pressure block extends to form a clamping portion, the outer pressure block extends inward to form an overlapping portion in contact with the clamping portion, and the fine-tuning block is located below the contact surface between the clamping portion and the overlapping portion.

[0014] Furthermore, it also includes an assembly seat forming an assembly cavity, the central axis assembly is arranged through the assembly cavity, and the pressing block assembly is located in the assembly seat and abuts against the driving mechanism partially located on the assembly seat.

[0015] Furthermore, a limiting portion is formed on the top of the assembly seat, and a driving mechanism rotatably arranged on the assembly seat is rotationally driven along the limiting portion and the space outside the assembly cavity.

[0016] Furthermore, it also includes a bushing located between the middle shaft assembly and the assembly seat, the middle shaft assembly slides freely along the bushing, and the inner pressure block is fitted with the bushing.

[0017] Furthermore, it also includes an adjusting member that acts on the pressing block assembly to form an external force to adjust the pressing space thereof.

[0018] The beneficial effects of the utility model are as follows:

[0019] Firstly, in the utility model, the clamping space of the pressure block assembly is adjusted through external force interference, which causes the local pressure block assembly to move to a certain extent, and then makes it close to the central axis assembly, and then combined with the external force, the force acting on the central axis assembly is enhanced, thereby compensating for the wear of the locking force.

[0020] Secondly, in the utility model, an inclined surface is selected to form a force-bearing surface, and the force generated during extrusion has a certain buffer due to the dispersion of the inclined surface, and the force is relatively mild, so that the adjusted locking force is a micro force, and the distance adjustment is also a fine adjustment.

[0021] Finally, in the present invention, the pressing block assembly includes a plurality of blocks, and a certain extrusion gap is provided between each block, which provides a basis for fine-tuning. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 An assembly diagram of a locking mechanism for a central axis of a photographic tripod provided by the utility model;

[0023] Figure 2 A cross-sectional view of the locking mechanism for the central axis of a photographic tripod provided by the utility model before adjustment;

[0024] Figure 3 A cross-sectional view of the locking mechanism for the central axis of a photographic tripod provided by the utility model after adjustment;

[0025] Figure 4 A cross-sectional view of the locking mechanism for the central axis of a photographic tripod provided by the utility model when unlocked;

[0026] Figure 5 A cross-sectional view of the locking mechanism of the central axis of a photographic tripod provided by the utility model when locked;

[0027] In the figure:

[0028] 100, central axis assembly; 200, pressure block assembly; 210, force-bearing inclined surface; 220, external pressure block; 221, overlapping portion; 230, fine-tuning block; 240, internal pressure block; 241, semi-enclosed cavity; 242, clamping portion; 300, driving mechanism; 400, assembly seat; 410, assembly cavity; 420, limiting portion; 500, power mechanism; 600, bushing. DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0030] See attached Figure 1-5 As shown, the core principle of the locking mechanism for the central axis of the photographic tripod in this embodiment is to set a pressure block assembly 200 close to the central axis assembly 100 near the central axis assembly 100; then generate external force through the driving mechanism 300, at this time the external force of the driving mechanism 300 directly acts on the pressure block assembly 200, so as to achieve the locking of the central axis assembly. The specific principle is: the original pressure block assembly 200 forms a clamping space, and under the participation of external force, the entire clamping space becomes wider, at this time the pressure block assembly 200 is further approached to the central axis assembly 100, and then the clamping force of the pressure block assembly 200 on the central axis assembly 100 is adjusted, so that the original damaged extrusion force becomes smaller or disappears, and is compensated to complete the locking.

[0031] In this embodiment, the pressing block assembly 200 includes at least two pressing blocks respectively close to the driving mechanism 300 and the central axis assembly 200, and at least a force-bearing inclined surface 210 is provided in the two pressing blocks. Then, the driving mechanism 100 increases the distance between the two pressing blocks, one is closer to the central axis assembly 100, and the other is in contact with the driving mechanism 300, thereby squeezing the central axis assembly 100 and completing the adjustment during locking.

[0032] First, the introduction of the pressing block assembly 200 is as follows:

[0033] In this embodiment, specifically, from the driving mechanism 200 toward the center axis assembly 100, the entire pressure block assembly 200 includes an outer pressure block 220, a fine-tuning block 230, and an inner pressure block 240, and the outer pressure block 220, the fine-tuning block 230, and the inner pressure block 240 are in contact with each other to form the force-bearing inclined surface 210. By selecting three pressure blocks, the force-bearing inclined surfaces 210 can be set on both sides of the fine-tuning block 230, and then the driving mechanism 300 acts between the fine-tuning block 230 and the outer pressure block 220, or between the fine-tuning block 230 and the inner pressure block 240, so that the clamping space becomes wider and the fine-tuning locking is completed.

[0034] In order to protect each pressing block of the pressing block assembly 200, refer to the attached Figure 1-5 It can be seen that in this embodiment, the inner pressure block 240 forms a semi-enclosed cavity 241 with an opening toward the fine-tuning block 230, and the fine-tuning block 230 is partially located in the semi-enclosed cavity 241. Due to the existence of the semi-enclosed cavity 241, at least the fine-tuning block 230 has a certain limit protection when moving inward and upward, and when it moves inward or upward, it drives the inner pressure block 240 close to the central shaft assembly 100 to move inward or upward accordingly.

[0035] As shown in the accompanying drawings, from top to bottom, the fine-tuning block 230 forms an inclined contact surface that is inclined away from the outer pressure block 220. At this time, the inclined contact surface that is away from the outer pressure block 220 is formed to guide the outer pressure block 220 to act on the fine-tuning block 230 after receiving the force, and then transmit it to the inner pressure block 220. The inclined contact surface makes the entire force transmission buffered, without impact, and causes less wear on the pressure block assembly itself.

[0036] See attached Figure 1 As shown, the inner pressure block 240 extends to form a clamping portion 242, the outer pressure block 220 extends inward to form an overlap portion 221 in contact with the pressure block 242, and the fine-tuning block 230 is located below the contact surface between the pressure block 242 and the overlap portion 221. Compared with a simple pressure block assembly, the inner pressure block 240 and the outer pressure block 220 are assembled above the fine-tuning block 230 through the overlap portion and the pressure block, and the two are in overlap contact, with more contact surfaces, and the contact surface between the inner pressure block 240 and the outer pressure block 220 increases, the assembly is firm, and the movement direction of the fine-tuning block 230 when subjected to force is limited. In this embodiment, specifically, an expansion cavity with a width gradually increasing from top to bottom is formed between the inner pressure block 240 and the outer pressure block 220, and then the fine-tuning block 230 is arranged in the expansion cavity. The fine-tuning block 230 can move from bottom to top to adjust the width of the expansion cavity, or move from top to bottom to narrow the entire width of the expansion cavity, thereby achieving the effect of adjusting the width of the entire clamping space.

[0037] Next, the assembly of the middle shaft assembly 100 and the like is described as follows:

[0038] In order to realize the assembly of the central axis component 100, etc., in this embodiment, it also includes an assembly seat 400 forming an assembly cavity 410, the central axis component 100 is arranged through the assembly cavity 410 (that is, the central axis component 100 moves up and down along the assembly cavity 410), and the pressure block assembly 200 is located in the assembly seat 400, and abuts against the driving mechanism 300 partially located in the assembly seat 410. Specifically, the assembly seat 410 is formed along the center toward the periphery, the central axis component 100 is arranged in the inner assembly cavity at the center of the assembly seat 400, and then the pressure block assembly 200 is arranged on the side. When the pressure block assembly 200 is subjected to force, it squeezes the inner side of the assembly seat 410, thereby pressing the central axis component 100 to complete the locking adjustment.

[0039] The entire locking mechanism requires the action of the power mechanism 500. Specifically, a limit portion 420 is formed on the top of the assembly seat 400. The power mechanism 500 disposed on the assembly seat 400 is rotated and driven to rotate along the space outside the limit portion 420 and the assembly cavity 410. In this embodiment, the power mechanism 500 is disposed outside the entire assembly cavity 410, and the relative action on the pressing block assembly 200 is smaller. At this time, the power mechanism 500 acts on the entire pressing block assembly 200 from the horizontal direction, so that it acts on the assembly seat 400, thereby locking the central axis assembly located at the center of the assembly seat 400.

[0040] In this embodiment, from inside to outside, it includes the middle shaft assembly 100, the bushing 600, the assembly seat 400, the pressing block assembly 200 located in the assembly cavity 410 formed by the assembly seat 400, and the outermost power mechanism 500. In this embodiment, a cam wrench is selected as the power mechanism 500. The cam wrench is close to the outer pressing block side, forming an arc-shaped inner surface that fits the cam wrench, providing a basis for its rotation. When in use, the cam wrench rotates along the length direction of the middle shaft assembly 100, thereby squeezing the entire assembly seat 400, driving the squeezing of the pressing block assembly 200 and the bushing 600, and completing the locking.

[0041] Specifically, the bushing 600 is a hollow triangular prism structure, and a quadrilateral hollow structure is arranged on each quadrilateral surface of the triangular prism. The thickness of the hollow structure is increased to form an outer lining, which is located above the assembly cavity and cooperates with the subsequent limit in three directions above the assembly seat 400. Specifically, the assembly seat 400 forms a triangular prism parallel to the bushing 600, and the bushing 600 is located in the assembly seat 400, and the outer lining above matches the assembly parts extending from the three top surfaces of the assembly seat 400.

[0042] The assembly cavity 410 is extended along a triangular prism surface of the assembly seat 400, and a limit portion 420 is formed above the assembly cavity 410 to prevent various components in the assembly cavity 410 from moving excessively upward, which would cause the locking mechanism to be deviated and affect its use.

[0043] When fine adjustment is required, the driving mechanism 300 located between the inner pressure block 240 and the fine adjustment block 230 moves upward, so that the inner pressure block 240 and the fine adjustment block 230 are slowly separated, and the width is adjusted, thereby causing the inner pressure 240 to act on the bushing 600, and further locking the entire middle shaft assembly 100 in the horizontal direction.

[0044] The power mechanism in this embodiment is specifically a bolt structure, which is arranged in parallel with the central axis assembly 100. After being subjected to external force, it is pushed into the gap between the internal pressure 240 and the fine-tuning block 230 to complete the fine-tuning.

[0045] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the utility model. They are not intended to limit the protection scope of the utility model. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the utility model should be included in the protection scope of the utility model.

[0046] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0047] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A locking mechanism for the central axis of a photographic tripod, characterized in that: include, Middle shaft assembly, A pressing block assembly disposed adjacent to the center shaft assembly; The driving mechanism acts on the pressing block assembly to lock the central axis assembly. The pressing block assembly forms a clamping space. Under the action of external force, the clamping space becomes wider, thereby adjusting the clamping force of the pressing block assembly on the central axis assembly.

2. The locking mechanism for the central axis of a photographic tripod according to claim 1, characterized in that: The pressing block assembly comprises at least two pressing blocks respectively close to the driving mechanism and the central axis assembly, and at least a force-bearing inclined surface is provided in the two pressing blocks.

3. The locking mechanism for the central axis of a photographic tripod according to claim 2, characterized in that: From the driving mechanism toward the central axis assembly, the pressure block assembly includes an outer pressure block, a fine-tuning block and an inner pressure block, and the outer pressure block, the fine-tuning block and the inner pressure block are in contact with each other to form the force-bearing inclined surface.

4. The locking mechanism for the central axis of a photographic tripod according to claim 3, characterized in that: The inner pressure block forms a semi-enclosed cavity with an opening toward the fine-tuning block, and the fine-tuning block is partially located in the semi-enclosed cavity.

5. The locking mechanism for the central axis of a photographic tripod according to claim 3, characterized in that: From top to bottom, the fine-tuning block forms an inclined contact surface that is inclined away from the outer pressure block.

6. The locking mechanism for the central axis of a photographic tripod according to claim 5, characterized in that: The inner pressure block extends to form a pressing portion, the outer pressure block extends inward to form an overlapping portion in contact with the pressing portion, and the fine-tuning block is located below the contact surface between the pressing portion and the overlapping portion.

7. The locking mechanism for the central axis of a photographic tripod according to claim 1, characterized in that: It also includes an assembly seat forming an assembly cavity, the central axis component is arranged through the assembly cavity, the pressing block component is located in the assembly seat, and abuts against the driving mechanism partially located on the assembly seat.

8. The locking mechanism for the central axis of a photographic tripod according to claim 7, characterized in that: A limiting portion is formed on the top of the assembly seat, and a driving mechanism rotatably arranged on the assembly seat is rotationally driven along the limiting portion and the space outside the assembly cavity.

9. The locking mechanism for the central axis of a photographic tripod according to claim 3, characterized in that: It also includes a bushing located between the middle shaft component and the assembly seat. The middle shaft component slides freely along the bushing, and the inner pressure block is fitted with the bushing.

10. The locking mechanism for the central axis of a photographic tripod according to claim 1, characterized in that: It also includes an adjusting member which acts on the pressing block assembly to form an external force to adjust the pressing space thereof.

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