Foot tube locking mechanism

Abstract

The utility model provides a foot tube locking mechanism which comprises an upper-stage foot tube, a lower-stage foot tube inserted into the upper-stage foot tube, a plug, a locking screw rod, a locking cone, a friction block and a limiting cover plate, the plug is fixed to the upper end of the lower-stage foot tube, one end of the locking screw rod is vertically fixed to the middle of the plug, and the other end of the locking screw rod is fixed to the limiting cover plate. The upper end of the locking screw penetrates out of a screw hole of the locking cone and then is fixedly connected with the limiting cover plate, a conical surface is arranged at the upper end of the locking cone, the friction blocks are semicircular blocks with large upper portions and small lower portions, arc-shaped inclined faces matched with the conical surface of the locking cone are arranged at the upper ends of the friction blocks, and the number of the friction blocks is two. And the limiting lugs are respectively sleeved on the limiting lugs and are limited between the plugs and the limiting cover plate. According to the utility model, the multi-stage telescopic foot tube can be quickly adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of tripods, in particular to a leg tube locking mechanism. Background Art

[0002] Tripods are usually used to provide support for photographic, video or mapping equipment. During the shooting process, it is often necessary to adjust the support angle and length of each support leg according to different terrains. Therefore, the legs of the support frame generally use multi-stage telescopic legs, and a locking mechanism is required to lock the upper leg and the lower leg when they need to be fixed. In the prior art, it is more common to use a locking nut for locking. From a structural point of view, although the locking nut is simple, it is not convenient to operate. When adjusting the length of the support leg, it is necessary to use one hand to loosen the locking nut and then tighten it. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a leg tube locking mechanism which can quickly adjust multi-stage telescopic leg tubes.

[0004] To solve the above technical problems, the technical solution of the utility model is: a leg tube locking mechanism, comprising an upper leg tube, a lower leg tube, a plug, a locking screw, a locking cone, a friction block, and a limit cover plate, the plug is fixed to the upper end portion of the lower leg tube, one end of the locking screw is vertically fixed to the middle of the plug, the locking cone has a screw hole matched with the locking screw, and the lower end of the locking cone is a plane; the friction block is a semi-annular block with a larger upper portion and a smaller lower portion, and the inner side surface of the upper end of the friction block is provided with an arc-shaped inclined surface matched with the conical surface of the locking cone; the upper end of the locking screw passes through the screw hole of the locking cone and is fixedly connected with the limit cover plate, the number of friction blocks is two, each of which is sleeved on a limit convex block, and the plug and the limit cover plate can limit the friction block from moving up and down; the upper end of the lower leg tube together with the plug, the locking screw, the locking cone, the friction block, and the limit cover plate are all inserted into the upper leg tube.

[0005] The method of use and working principle of the above technical solution are as follows: hold the upper leg tube with one hand and keep it still, and hold the lower leg tube with the other hand and rotate it left or right, so that the lower leg tube and the upper leg tube are in a locked state or a loosened state; when the lower leg tube rotates left, it will drive the plug and the locking screw to rotate left. Since the locking screw and the locking cone are threadedly connected, when the locking screw rotates left, the locking cone will move upward relative to the locking screw until the conical surface of the locking cone fits and slides with the inclined surface of the friction block, thereby pushing The friction block moves radially outward, generating an expansion force in the upper leg tube. At this time, the lower leg tube is in a locked state with the upper leg tube; when the lower leg tube rotates right, it will drive the plug and the locking screw to rotate right. Since the locking screw and the locking cone are threaded connections, when the locking screw rotates right, the locking cone will move downward relative to the locking screw, forming a gap between the friction block and the inner wall of the upper leg tube. At this time, the lower leg tube is in a loosened state with the upper leg tube, and the lower leg tube can move up and down in the upper leg tube.

[0006] In one embodiment, the circumferential surface of the locking cone is provided with two symmetrical limiting protrusions, the lower surface of the limiting protrusion is an inclined surface, and the angle between the inclined surface and the circumferential surface of the locking cone is less than 90°. A longitudinal through hole is provided in the middle of the friction block, and the lower hole wall of the through hole is an inclined surface matching the lower surface of the limiting protrusion.

[0007] In one embodiment, the circumferential surface of the locking cone is provided with two symmetrical axial key grooves, the inner side surfaces of the lower ends of the two friction blocks are each provided with an axial key groove, and the locking cone and the two friction blocks are connected by keys.

[0008] Furthermore, two symmetrical longitudinal ribs are provided in the upper leg tube to limit the circumferential rotation of the friction block.

[0009] Furthermore, a fixing sleeve is provided at the lower end of the upper leg tube to prevent the lower leg tube from falling out.

[0010] In one embodiment, the plug is fixed to the upper end of the lower leg pipe by gluing, and the locking screw and the plug are integrally formed.

[0011] In one embodiment, the length of the locking cone is smaller than the length of the friction block.

[0012] In one embodiment, the lower surface of the limiting protrusion is an inclined surface, and the angle between the inclined surface and the peripheral surface of the locking cone is less than 60°.

[0013] In one embodiment, two symmetrical longitudinal ribs are also provided in the lower leg tube, and the plug is provided with an avoidance groove that matches the longitudinal ribs in the lower leg tube.

[0014] The beneficial effect of the utility model is that since the plug and the limit cover plate can limit the upward and downward movement of the friction block, under the cooperation of the locking screw, the locking cone and the friction block, the friction block can only passively move radially in the upper leg tube, and the lower leg tube can be locked or loosened with the upper leg tube by rotating the lower leg tube to the left or right, thereby realizing rapid adjustment of the multi-stage telescopic leg tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the locking mechanism in Example 1 of the utility model when it is in a locked state;

[0016] Figure 2 It is a structural schematic diagram of the locking mechanism in Example 1 of the utility model when it is in a released state;

[0017] Figure 3 This is a schematic diagram of the structure of the plug and the locking screw in Example 1 of the utility model;

[0018] Figure 4 This is a schematic diagram of the locking cone structure in Example 1 of the utility model;

[0019] Figure 5 for Figure 4 A top view of

[0020] Figure 6 This is a schematic diagram of the friction block structure in Example 1 of the utility model;

[0021] Figure 7 for Figure 6 Left-facing view of

[0022] Figure 8 for Figure 6 Bottom view of

[0023] Fig. 9 This is a schematic diagram of the locking cone structure in Example 2 of the utility model;

[0024] Fig.10 This is a schematic diagram of the friction block structure in Example 2 of the utility model;

[0025] Fig.11 This is a schematic diagram of the combined structure of the locking cone and the friction block in Example 2 of the utility model;

[0026] The accompanying drawings are marked as follows:

[0027] 1. Upper leg tube; 2. Lower leg tube; 3. Plug; 4. Locking screw; 5. Locking cone; 6. Friction block; 7. Limit cover plate; 8. Fixing sleeve. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present utility model, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meaning of the terms can be understood according to the specific circumstances. Example

[0031] like Figures 1 to 8As shown, a leg tube locking mechanism comprises an upper leg tube 1, a lower leg tube 2, a plug 3, a locking screw 4, a locking cone 5, a friction block 6, and a limiting cover plate 7. The plug 3 is fixed to the upper end of the lower leg tube 2 by gluing. Two symmetrical longitudinal ribs are arranged in the lower leg tube 2. The plug 3 is provided with an avoidance groove matched with the longitudinal ribs in the lower leg tube 2. One end of the locking screw 4 is vertically fixed to the middle part of the plug 3 and is integrally formed with the plug 3. The locking cone 5 has a screw hole matched with the locking screw 4. The lower end of the locking cone 5 is a plane, and the upper end is provided with a conical surface. The circumferential surface of the locking cone 5 is provided with two symmetrical limiting protrusions. The lower surface of the limiting protrusion is an inclined surface. The angle between the inclined surface and the circumferential surface of the locking cone 5 is less than 60°. The friction block 6 is a semi-annular block with a larger upper portion and a smaller lower portion. The inner side surface of the upper end of 6 is provided with an arc-shaped inclined surface matching the conical surface of the locking cone 5, and a longitudinal through hole is provided in the middle of the friction block 6. The lower hole wall of the through hole is an inclined surface matching the lower surface of the limiting protrusion. The length of the locking cone 5 is less than the length of the friction block 6; the upper end of the locking screw 4 passes through the screw hole of the locking cone 5 and is fixedly connected with the limiting cover plate 7. There are two friction blocks 6, which are respectively sleeved on a limiting protrusion. The plug 3 and the limiting cover plate 7 can limit the up and down movement of the friction block 6; the upper end of the lower leg tube 2 together with the plug 3, the locking screw 4, the locking cone 5, the friction block 6, and the limiting cover plate 7 are all inserted into the upper leg tube 1; two symmetrical longitudinal ribs are provided in the upper leg tube 1 to limit the circumferential rotation of the friction block 6; a fixing sleeve 8 is provided at the lower end of the upper leg tube 1 to prevent the lower leg tube 2 from falling out.

[0032] The method of use and working principle of this embodiment are as follows: hold the upper leg tube 1 with one hand and keep it still, and hold the lower leg tube 2 with the other hand and rotate it left or right, so that the lower leg tube 2 and the upper leg tube 1 are in a locked state or a loosened state; when the lower leg tube 2 rotates left, it will drive the plug 3 and the locking screw 4 to rotate left. Since the locking screw 4 and the locking cone 5 are threadedly connected, when the locking screw 4 rotates left, the locking cone 5 will move upward relative to the locking screw 4 until the conical surface of the locking cone 5 slides with the inclined surface of the friction block 6, thereby pushing the friction block 6 to move radially outward, generating an expansion force in the upper leg tube 1, At this time, the lower leg tube 2 is in a locked state with the upper leg tube 1; when the lower leg tube 2 rotates right, it will drive the plug 3 and the locking screw 4 to rotate right. Since the locking screw 4 and the locking cone 5 are threadedly connected, when the locking screw 4 rotates right, the locking cone 5 will move downward relative to the locking screw 4 until the inclined surface of the limiting protrusion of the locking cone 5 slides in contact with the inclined surface of the through hole of the friction block 6, thereby pulling the friction block 6 to move radially inward, so that a gap is formed between the friction block 6 and the inner wall of the upper leg tube 1. At this time, the lower leg tube 2 and the upper leg tube 1 are in a loosened state, and the lower leg tube 2 can move up and down in the upper leg tube 1.

[0033] Since the plug 3 and the limit cover plate 7 can limit the upward and downward movement of the friction block 6, with the cooperation of the locking screw 4, the locking cone 5 and the friction block 6, the friction block 6 can only passively move radially in the upper leg tube 1. By rotating the lower leg tube 2 to the left or right, the lower leg tube 2 and the upper leg tube 1 can be in a locked state or a loosened state, thereby realizing rapid adjustment of the multi-stage telescopic leg tube. Example

[0034] like Figures 9 to 11 As shown, compared with Example 1, this embodiment is mainly different in the partial structures of the locking cone 5 and the friction block 6. Specifically, this embodiment cancels the limiting protrusions on the peripheral surface of the locking cone 5 and cancels the through hole in the middle of the friction block 6. In this way, the locking cone 5 cannot pull the friction block 6 to move radially inward, but it does not affect the formation of a gap between the friction block 6 and the inner wall of the upper leg tube 1. On the basis of the above, this embodiment sets two symmetrical axial keyways on the peripheral surface of the locking cone 5, and sets an axial keyway on each of the inner side surfaces of the lower ends of the two friction blocks 6. The locking cone 5 and the two friction blocks 6 are connected by keys.

[0035] The structures and connection relationships of the remaining components are exactly the same as those in Example 1.

[0036] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

[0037] In order to make it easier for ordinary technicians in the field to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and for the sake of clarity, some other elements are omitted in the application document. Ordinary technicians in the field should realize that these omitted elements may also constitute the content of the present invention.

Claims

1. A leg locking mechanism, characterized in that: The utility model comprises an upper leg tube (1), a lower leg tube (2) inserted into the upper leg tube (1), a plug (3), a locking screw (4), a locking cone (5), a friction block (6) and a limit cover plate (7), wherein the plug (3) is fixed to the upper end of the lower leg tube (2), one end of the locking screw (4) is vertically fixed to the middle part of the plug (3), the locking cone (5) has a screw hole matched with the locking screw (4), and the locking cone (5) is provided with a screw hole. The lower end is a plane, and the upper end is provided with a conical surface; the friction block (6) is a semi-annular block with a larger upper portion and a smaller lower portion, and the inner side surface of the upper end of the friction block (6) is provided with an arc-shaped inclined surface that matches the conical surface of the locking cone (5); the upper end of the locking screw (4) passes through the screw hole of the locking cone (5) and is fixedly connected to the limiting cover plate (7), and the number of friction blocks (6) is two, each of which is sleeved on a limiting protrusion and is limited between the plug (3) and the limiting cover plate (7).

2. The leg locking mechanism according to claim 1, characterized in that: The circumferential surface of the locking cone (5) is provided with two symmetrical limiting protrusions, the lower surface of the limiting protrusion is an inclined surface, and the angle between the inclined surface and the circumferential surface of the locking cone (5) is less than 90°. The middle part of the friction block (6) is provided with a longitudinal through hole, and the lower hole wall of the through hole is an inclined surface that matches the lower surface of the limiting protrusion.

3. The leg locking mechanism according to claim 1, characterized in that: The circumferential surface of the locking cone (5) is provided with two symmetrical axial key grooves, and the inner side surfaces of the lower ends of the two friction blocks (6) are each provided with an axial key groove, and the locking cone (5) and the two friction blocks (6) are connected by a key.

4. The leg locking mechanism according to any one of claims 1 to 3, characterized in that: Two symmetrical longitudinal ribs are arranged inside the upper leg tube (1) and can limit the circumferential rotation of the friction block (6).

5. The leg locking mechanism according to any one of claims 1 to 3, characterized in that: A fixing sleeve (8) is provided at the lower end of the upper leg tube (1) to prevent the lower leg tube (2) from falling out.

6. The leg locking mechanism according to any one of claims 1 to 3, characterized in that: The plug (3) is fixed to the upper end of the lower leg tube (2) by gluing, and the locking screw (4) and the plug (3) are integrally formed.

7. The leg locking mechanism according to any one of claims 1 to 3, characterized in that: The length of the locking cone (5) is smaller than the length of the friction block (6).

8. The leg locking mechanism according to any one of claims 1 to 3, characterized in that: The lower surface of the limiting protrusion is an inclined surface, and the angle between the inclined surface and the peripheral surface of the locking cone (5) is less than 60°.

9. The leg locking mechanism according to any one of claims 1 to 3, characterized in that: The lower leg tube (2) is also provided with two symmetrical longitudinal ribs, and the plug (3) is provided with an avoidance groove that matches the longitudinal ribs in the lower leg tube (2).

Images