A three-legged inner inflation structure

Abstract

The internal expansion structure of a tripod comprises a first pipe and a second pipe sleeved together, and an internal expansion structure is arranged at the sleeving position of the first pipe and the second pipe, characterized in that the internal expansion structure comprises a first threaded part arranged in the first pipe and a second threaded part arranged in the second pipe, the first threaded part is threadedly connected with the second threaded part, the outer periphery of the first threaded part and the second threaded part is provided with a pressing part, the outer wall of the pressing part can be pressed on the inner wall of the first pipe, the distance between the first threaded part and the second threaded part is adjusted by rotating the first threaded part, when the distance between the first threaded part and the second threaded part is reduced, a first extrusion position is formed between the first threaded part and the pressing part, and a second extrusion position is formed between the second threaded part and the pressing part, the first extrusion position and the second extrusion position jointly extrude to expand the pressing part and extrude the pressing part on the inner wall of the first pipe. The internal expansion structure in the application has two extrusion positions for the pressing part, and the locking force is stronger.

Description

Technical Field

[0001] This utility model belongs to the technical field of photography and videography auxiliary devices, specifically relating to an internal expansion structure for a tripod. Background Technology

[0002] A tripod is a commonly used photography and videography auxiliary device. In a conventional tripod structure, there is usually a telescopic support rod structure. These support rods are generally sleeve-type telescopic rods. The internal connection of the sleeve-type telescopic rod has a locking structure for unlocking and positioning, such as an internal expansion structure.

[0003] Many existing tripods have simple internal expansion structures, but the internal expansion locking force is not strong enough, and they are prone to slipping under heavy loads. Based on this, this application further designs and improves the internal expansion structure in tripods. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model provides an internal expansion structure for a tripod, which adopts a rotary locking and unlocking method and has two internal expansion locking structures, resulting in stronger locking force and more stable connection of telescopic tubes.

[0005] The present invention is solved by the following technical solution.

[0006] An internal expansion structure for a tripod includes a first tube and a second tube fitted together. The internal expansion structure is located at the point where the first and second tubes are fitted together. The internal expansion structure comprises: a first threaded component in the first tube and a second threaded component in the second tube; the first threaded component and the second threaded component are threaded together; a clamping component is provided on the outer periphery of the first and second threaded components, the outer wall of which can press against the inner wall of the first tube; the distance between the first threaded component and the second threaded component is adjusted by rotation; when the distance between the first threaded component and the second threaded component decreases: a first compression position is formed between the first threaded component and the clamping component, and a second compression position is formed between the second threaded component and the clamping component; the first compression position and the second compression position together compress the clamping component, causing it to expand and press against the inner wall of the first tube.

[0007] The internal expansion structure in this application has a clamping member with two compression points, which makes it more stable after compression and locking. Specifically, when locking is required, the first threaded member is rotated to shorten the distance between it and the second threaded member. During this process, the first and second compression points work together to compress the clamping member, causing it to expand in two positions, resulting in a stronger locking force.

[0008] In a preferred embodiment, the first extrusion position is formed by the extrusion of the first inclined surface on the first threaded component and the first inclined surface on the clamping component; the second extrusion position is formed by the extrusion of the second inclined surface on the second threaded component and the second inclined surface on the clamping component, and the clamping component can be expanded outward when extruded at both positions.

[0009] In a preferred embodiment, the length of the second inclined plane is more than five times the length of the first inclined plane, that is, the expansion area of ​​the second extrusion position is larger and more stable.

[0010] In a preferred embodiment, the first threaded component is provided with a rotating control lever for rotating the first threaded component.

[0011] In a preferred embodiment, the end face of the first threaded component is provided with an insertion hole, into which the rotating control lever can be inserted and drive the first threaded component to rotate synchronously.

[0012] In a preferred embodiment, the inner end of the rotating control lever is limited in the inner cavity of the second threaded component by a limiting screw for assembly of the overall structure.

[0013] In a preferred embodiment, a protrusion and a groove for limiting are provided between the outer wall of the first threaded part and the inner wall of the clamping part, which are used to limit the clamping part after assembly.

[0014] In a preferred embodiment, the first threaded component has a threaded inner cavity, and the second threaded component has a protruding threaded portion. The inner wall of the threaded inner cavity and the outer wall of the threaded portion are provided with matching threaded structures for threaded assembly, which can be easily screwed in and out by rotation.

[0015] In a preferred embodiment, the outer wall of the second threaded component is provided with a radial groove, and the inner wall of the second pipe is provided with a radial strip. After assembly, the radial strip enters the radial groove to prevent the second threaded component from rotating circumferentially.

[0016] In a preferred embodiment, the clamping member includes two clamping member halves, with a second radial groove formed between the two clamping member halves. The inner wall of the first pipe is provided with a second radial strip. After assembly, the second radial strip enters the second radial groove to prevent the clamping member from rotating circumferentially.

[0017] Compared with the prior art, the present invention has the following advantages: it provides an internal expansion structure for a tripod, adopts a rotary locking and unlocking method, and has two internal expansion locking structures, which have stronger locking force and more stable connection of telescopic tubes. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of one of the telescopic rods in the tripod of this utility model.

[0019] Figure 2 This is a cross-sectional view of the inner expansion structure in the telescopic rod of this utility model.

[0020] Figure 3 for Figure 2 A magnified view of region A in the middle.

[0021] Figure 4 This is an enlarged view of a portion of the structure of the first pipe fitting in this utility model.

[0022] Figure 5 This is a perspective view of the internal expansion structure in this utility model.

[0023] Figure 6 This is a perspective view of the internal expansion structure of the omitted clamping component in this utility model.

[0024] Figure 7 The three-dimensional internal expansion structure in this utility model Figure 1 .

[0025] Figure 8 The three-dimensional internal expansion structure in this utility model Figure 2 . Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] In the following embodiments, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0028] In the description of this utility model, it should be understood that the terms such as center, longitudinal, transverse, length, width, thickness, upper, lower, front, back, left, right, vertical, horizontal, top, bottom, inner, outer, clockwise, and counterclockwise, indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features shown. In the description of this utility model, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] See Figures 1 to 8This utility model relates to an internal expansion structure for a tripod, comprising a first tube 1 and a second tube 2 nested together. An internal expansion structure is provided at the junction of the first tube 1 and the second tube 2. The internal expansion structure comprises: a first threaded member 31 in the first tube 1 and a second threaded member 21 in the second tube 2; the first threaded member 31 and the second threaded member 21 are threaded together; a clamping member 11 is provided on the outer periphery of the first threaded member 31 and the second threaded member 21, the outer wall of which can press against the inner wall of the first tube 1; the distance between the first threaded member 31 and the second threaded member 21 can be adjusted by rotation. When the distance between the first threaded member 31 and the second threaded member 21 decreases: a first compression position is formed between the first threaded member 31 and the clamping member 11, and a second compression position is formed between the second threaded member 21 and the clamping member 11; the first compression position and the second compression position together compress the clamping member 11, causing it to expand and press against the inner wall of the first tube 1.

[0030] Specifically, in this application, the first compression position is formed by the compression of the first inclined surface 313 on the first threaded component 31 and the inclined surface 113 on the clamping component 11; the second compression position is formed by the compression of the second inclined surface 212 on the second threaded component 21 and the inclined surface 112 on the clamping component 11. Compression at both positions causes the clamping component 11 to expand outwards. Furthermore, the length of the inclined surface 112 is more than five times the length of the inclined surface 113, meaning the expansion area of ​​the second compression position is larger, the friction surface is larger, and it is more stable.

[0031] Furthermore, in this application, the first threaded component 31 is provided with a rotating control lever 3 for rotating the first threaded component 31. The control lever 3 can pass through the first pipe component 1 and be connected to other operating components to perform rotation operations. Further, the end face of the first threaded component 31 is provided with an insertion hole 318, into which the rotating control lever 3 can be inserted and drive the first threaded component 31 to rotate synchronously; and the inner end of the rotating control lever 3 is limited in the inner cavity of the second threaded component 21 by a limiting screw 35 for assembly of the overall structure.

[0032] In this application, a protrusion 111 and a groove 311 for limiting are provided between the outer wall of the first threaded member 31 and the inner wall of the clamping member 11. After assembly, the groove 311 is used to limit the clamping member 11, and the width of the groove 311 is slightly larger than the width of the protrusion 111.

[0033] In this application, the first threaded component 31 has a threaded inner cavity 315, and the second threaded component 21 has a protruding threaded portion 215. The inner wall of the threaded inner cavity 315 and the outer wall of the threaded portion 215 are provided with matching threaded structures for threaded assembly, which can be easily screwed in and out by rotation.

[0034] Furthermore, in this application, the outer wall of the second threaded component 21 is provided with a radial groove 219, and the inner wall of the second pipe component 2 is provided with a radial strip. After assembly, the radial strip enters the radial groove 219 to prevent the second threaded component 21 from rotating circumferentially. The clamping component 11 includes two clamping component halves, and a second radial groove 119 is formed between the two clamping component halves. The inner wall of the first pipe component 1 is provided with a second radial strip 19. After assembly, the second radial strip 19 enters the second radial groove 119 to prevent the clamping component 11 from rotating circumferentially.

[0035] As can be seen from the above description, the internal expansion structure in this application has two compression points in the clamping member 11, which makes it more stable after compression and locking. Specifically, when locking is required, the operating lever 3 is rotated and the first threaded member 31 is rotated, shortening the distance between it and the second threaded member 21. During this process, the first compression point and the second compression point jointly compress, causing the clamping member 11 to expand in two positions. Specifically: in the first compression point, the first inclined surface 313 compresses with the inclined surface 113. The cone angle at this point is small, making it easy for a small axial force to generate a large radial force, making the connection between the first pipe 1 and the second pipe 2 more stable; in the second compression point, the second inclined surface 212 compresses with the inclined surface 112. The cone surface at this point expands, forming a longer connection between the large pipe and the expansion mechanism. When unlocking is required, the control lever 3 is rotated in the opposite direction, causing the first threaded component 31 to rotate, thus increasing the distance between it and the second threaded component 21. At this time, the conical surfaces that are pressing against each other in the first pressing position are released. Simultaneously, the first threaded component 31 drives the pressing component 11 to move through the structure of the protrusion 111 and the groove 311, so that the conical surfaces that are pressing against each other in the second pressing position are released, thereby achieving unlocking.

[0036] As described above, this utility model provides an internal expansion structure for a tripod, which adopts a rotary locking and unlocking method and has two internal expansion locking structures, resulting in stronger locking force and more stable connection of telescopic tubes.

[0037] The scope of protection of this utility model includes, but is not limited to, the above embodiments. The scope of protection of this utility model is defined by the claims. Any substitutions, modifications, or improvements to this technology that are easily conceived by those skilled in the art shall fall within the scope of protection of this utility model.

Claims

1. An internal expansion structure for a tripod, comprising a first tube (1) and a second tube (2) sleeved together, wherein an internal expansion structure is provided at the position where the first tube (1) and the second tube (2) are sleeved together, characterized in that, The internal expansion structure includes: A first threaded component (31) is provided in the first pipe fitting (1), and a second threaded component (21) is provided in the second pipe fitting (2); the first threaded component (31) and the second threaded component (21) are threadedly connected; The outer periphery of the first threaded part (31) and the second threaded part (21) is provided with a clamping part (11), the outer wall of which can press against the inner wall of the first pipe (1); The first threaded part (31) adjusts the distance between itself and the second threaded part (21) by rotating. When the distance between the first threaded part (31) and the second threaded part (21) decreases: a first extrusion position is formed between the first threaded part (31) and the clamping part (11), and a second extrusion position is formed between the second threaded part (21) and the clamping part (11). The first extrusion position and the second extrusion position work together to cause the clamping member (11) to expand and be pressed against the inner wall of the first pipe (1).

2. The internal expansion structure of a tripod according to claim 1, characterized in that, The first extrusion position is formed by the extrusion of the first inclined surface (313) on the first threaded part (31) and the first inclined surface (113) on the clamping part (11); the second extrusion position is formed by the extrusion of the second inclined surface (212) on the second threaded part (21) and the second inclined surface (112) on the clamping part (11).

3. The internal expansion structure of a tripod according to claim 2, characterized in that, The length of the second inclined plane (112) is more than five times the length of the first inclined plane (113).

4. The internal expansion structure of a tripod according to claim 1, characterized in that, The first threaded part (31) is provided with a rotating control lever (3).

5. The internal expansion structure of a tripod according to claim 4, characterized in that, The first threaded component (31) has an insertion hole (318) on its end face, into which the rotating control lever (3) can be inserted and drive the first threaded component (31) to rotate synchronously.

6. The internal expansion structure of a tripod according to claim 5, characterized in that, The inner end of the rotating control lever (3) is limited in the inner cavity of the second threaded part (21) by a limiting screw (35).

7. The internal expansion structure of a tripod according to claim 1, characterized in that, A protrusion (111) and a groove (311) for limiting are provided between the outer wall of the first threaded part (31) and the inner wall of the clamping part (11).

8. The internal expansion structure of a tripod according to claim 1, characterized in that, The first threaded component (31) has a threaded inner cavity (315), and the second threaded component (21) has a threaded portion (215). The inner wall of the threaded inner cavity (315) and the outer wall of the threaded portion (215) have matching threaded structures.

9. The internal expansion structure of a tripod according to any one of claims 1 to 8, characterized in that, The outer wall of the second threaded part (21) is provided with a radial groove (219), and the inner wall of the second pipe part (2) is provided with a radial strip.

10. The internal expansion structure of a tripod according to claim 9, characterized in that, The clamping member (11) includes two clamping member halves, and a second radial groove (119) is formed between the two clamping member halves. The inner wall of the first pipe (1) is provided with a second radial strip (19).

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