Limiting and fixing structure and crawling ladder

Abstract

The utility model relates to the field of trailer accessories, in particular to a limiting and fixing structure and a crawling ladder. The limiting and fixing structure comprises a sleeve, a first limiting groove and a second limiting groove are formed in one end of the sleeve, and the depth of the first limiting groove is larger than that of the second limiting groove; the pin shaft is telescopically and rotatably mounted in the sleeve; the pin shaft comprises a sliding part matched with the limiting ring and a limiting part matched with the sleeve; a limiting column is arranged at the end, away from the limiting part, of the sliding part and can be switched between the first limiting groove and the second limiting groove so as to change the length, extending out of the sleeve, of the limiting part. The limiting column is connected with a handle. According to the limiting and fixing structure, the limiting column and the handle connected with the limiting column are arranged, the limiting column can be conveniently pulled to be separated from the first limiting groove and the second limiting groove and switched between the first limiting groove and the second limiting groove, and therefore the length of the part, stretching out of the sleeve, of the pin shaft is changed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of trailer accessories, in particular to a limiting and fixing structure and a ladder stand. BACKGROUND

[0002] The ladder stand is a loading and unloading tool for the higher position of the trailer or truck tail. In order to facilitate the transportation of different wheelbase mechanical equipment, the ladder stand is often set to be transversely slidable.

[0003] The Chinese utility model patent with the publication number CN204915486U discloses a ladder stand device capable of being adjusted left and right. The ladder stand device comprises a ladder stand bearing body and a long pin shaft installed on the tail beam of the vehicle frame. An ear plate is arranged at the lower end of the ladder stand bearing body, and the ear plate is slidably sleeved on the outer side of the long pin shaft. The position of the ladder stand bearing body is adjusted by adjusting the position of the ear plate on the long pin shaft. After the position is adjusted, the ladder stand device needs to be fixed by bolts to ensure that the relative position of the ladder stand bearing body and the tail beam of the vehicle frame does not change. However, the bolt fixing structure needs to rotate the nut when used, which is inconvenient to use.

[0004] Therefore, there is a need in the art for a new technical solution to solve the above problems. SUMMARY

[0005] In order to improve or solve the technical problems of inconvenient use of the bolt fixing structure in the prior art, the utility model provides a limiting and fixing structure. The limiting and fixing structure comprises: a sleeve, a first limiting groove and a second limiting groove are formed in one end of the sleeve, the depth of the first limiting groove is greater than the depth of the second limiting groove; a limiting ring is formed on the inner wall of the sleeve; a pin shaft is installed in the sleeve in an extendable and rotatable manner; the pin shaft comprises a sliding part matched with the limiting ring and a limiting part matched with the sleeve; a compression spring is arranged between the limiting part and the limiting ring; a limiting column matched with the first limiting groove and the second limiting groove is arranged at one end of the sliding part away from the limiting part, the limiting column is configured to be switched in the first limiting groove and the second limiting groove to change the length of the limiting part extending out of the sleeve; and a handle is connected to the limiting column.

[0006] The utility model relates to a limiting fixing structure, including sleeve and pin shaft. Wherein, the first limiting slot and the second limiting slot are set up in one end of sleeve, and the depth of first limiting slot is greater than the depth of second limiting slot, pin shaft is installed in sleeve and is rotatable, and the limiting post is set up in one end of pin shaft, when the limiting post is located in second limiting slot, pin shaft is retracted in sleeve, when the limiting post is located in first limiting slot, pin shaft part protrudes from sleeve, and it is convenient for fixed ladder main part and frame main part. The limiting ring is formed on the inner wall of sleeve, pin shaft includes sliding part and limiting part matched with limiting ring, compression spring is arranged between limiting ring and limiting part, and the limiting post is pulled in first limiting slot or second limiting slot through the counterforce of compression spring, preventing the limiting post from coming off from first limiting slot or second limiting slot. The handle is connected with the limiting post, and the limiting post can be pulled out of first limiting slot and second limiting slot and switched in first limiting slot and second limiting slot by pulling and rotating the handle. Through the above setting, the utility model discloses a limiting fixing structure setting limiting post and handle connected with limiting post, which can conveniently pull the limiting post out of first limiting slot and second limiting slot and switch in first limiting slot and second limiting slot, so as to change the length of pin shaft protruding from sleeve.

[0007] Further, the mounting hole matched with the limiting post is formed on the sliding part; one end of the limiting post is provided with a nut, and the other end of the limiting post is threadedly connected with a nut.

[0008] Further, the handle comprises a first arm, a second arm symmetrically arranged with the first arm, and a connecting arm connecting the first arm and the second arm; the through hole matched with the limiting post is formed on the first arm and the second arm, the first arm is close to the nut, and the second arm is close to the nut.

[0009] Further, the first arm comprises an inclined part connected with the connecting arm, and a horizontal part in which the through hole is formed.

[0010] Further, the first limiting slot and the second limiting slot are arranged in a cross shape.

[0011] Further, the limiting part away from the sliding part is formed with a guide surface.

[0012] In order to improve or solve the technical problems of inconvenient use of the bolt fixing structure in the prior art, the utility model provides a ladder stand. The ladder stand comprises a ladder stand body, which is suitable for sliding connection with a frame body; the limiting fixing structure of any one of the above-mentioned limiting fixing structures, the sleeve of the limiting fixing structure is fixedly connected with the ladder stand body, and the pin shaft of the limiting fixing structure is suitable for connecting the frame body through the limiting fixing structure.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] First limit slot and second limit slot are arranged on one end of the sleeve, and the depth of the first limit slot is greater than the depth of the second limit slot; the pin shaft is retractable and rotatable and is arranged in the sleeve, and a limit post is arranged on one end of the pin shaft; when the limit post is located in the second limit slot, the pin shaft is retracted into the sleeve; when the limit post is located in the first limit slot, the pin shaft is partially extended out of the sleeve, so that the ladder main body and the frame main body are fixed; a limit ring is formed on the inner wall of the sleeve, the pin shaft comprises a sliding part and a limit part matched with the limit ring, a compression spring is arranged between the limit ring and the limit part, the limit post is pulled tightly in the first limit slot or the second limit slot through the reaction force of the compression spring, so that the limit post is prevented from being pulled out of the first limit slot or the second limit slot; the limit post is connected with a handle, and the limit post can be pulled out of the first limit slot and the second limit slot and switched in the first limit slot and the second limit slot by pulling and rotating the handle. BRIEF DESCRIPTION OF DRAWINGS

[0015] The preferred embodiments of the utility model will be described below with reference to the drawings, in which:

[0016] Figure 1 is the schematic view of an embodiment of the limit fixing structure of the utility model;

[0017] Figure 2 is another schematic view of an embodiment of the limit fixing structure of the utility model;

[0018] Figure 3 is the exploded schematic view of an embodiment of the limit fixing structure of the utility model.

[0019] List of reference signs: 1, sleeve; 11, first limit slot; 12, second limit slot; 2, pin shaft; 21, sliding part; 211, mounting hole; 22, limit part; 221, guide surface; 23, compression spring; 24, limit post; 241, nut; 242, nut; 25, handle; 251, first branch arm; 252, second branch arm; 253, connecting arm; 254, inclined part; 255, horizontal part. DETAILED DESCRIPTION

[0020] The preferred embodiments of the utility model will be described below with reference to the drawings, in which:

[0021] It should be noted that in the description of the utility model, the terms "upper", "lower", "left", "right", "inner", "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is merely for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In addition, it should be further pointed out that in the description of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0023] In order to improve or solve the technical problems of inconvenient use of the bolt fixing structure in the prior art, the utility model provides a limiting fixing structure. The limiting fixing structure comprises: a sleeve 1, a first limiting groove 11 and a second limiting groove 12 are formed in one end of the sleeve 1, the depth of the first limiting groove 11 is greater than the depth of the second limiting groove 12; a limiting ring is formed on the inner wall of the sleeve 1; a pin shaft 2 is installed in the sleeve 1 and can be extended and retracted and rotated; the pin shaft 2 comprises a sliding part 21 matched with the limiting ring and a limiting part 22 matched with the sleeve 1; a compression spring 23 is arranged between the limiting part 22 and the limiting ring; a limiting column 24 matched with the first limiting groove 11 and the second limiting groove 12 is arranged at one end of the sliding part 21 away from the limiting part 22, and the limiting column 24 is configured to switch in the first limiting groove 11 and the second limiting groove 12 to change the length of the limiting part 22 extending out of the sleeve 1; the limiting column 24 is connected with a handle 25.

[0024] Figure 1 It is a schematic view of an embodiment of the limiting fixing structure of the utility model, Figure 2 It is another schematic view of an embodiment of the limiting fixing structure of the utility model, Figure 3 It is an exploded schematic view of an embodiment of the limiting fixing structure of the utility model. As shown in Figure 1 、 Figure 2 and Figure 3 The utility model discloses a limiting fixing structure, which comprises a sleeve 1 and a pin shaft 2.

[0025] Continuing to refer to Figure 1 、 Figure 2 and Figure 3In one or more embodiments, the sleeve 1 is substantially cylindrical, and a first limiting slot 11 and a second limiting slot 12 are formed at one end of the sleeve 1. The first limiting slot 11 and the second limiting slot 12 are both strip-shaped, and the first limiting slot 11 and the second limiting slot 12 are arranged in a cross shape. Specifically, the depth of the first limiting slot 11 is greater than the depth of the second limiting slot 12. Further, a limiting ring is formed on the inner wall of the sleeve 1. The limiting ring extends from the inner wall of the sleeve 1 to the central axis of the sleeve 1. Specifically, the limiting ring is annular. Alternatively, the limiting ring can include multiple pieces, each of which is substantially fan-shaped, and the multiple pieces are arranged along the circumference of the sleeve 1.

[0026] Continuing to refer to Figure 1 , Figure 2 and Figure 3 , the pin shaft 2 is telescopically and rotatably installed in the sleeve 1. In one or more embodiments, the pin shaft 2 includes a sliding portion 21 with a diameter matching that of the limiting ring, and a limiting portion 22 with a diameter matching that of the sleeve 1. That is, the sliding portion 21 is in sliding connection with the limiting ring, and the limiting portion 22 is in sliding connection with the sleeve 1, and the diameter of the limiting portion 22 is greater than the inner diameter of the limiting ring, so that the limiting portion 22 cannot pass through the limiting ring. A compression spring 23 is arranged between the limiting portion 22 and the limiting ring, and the compression spring 23 is sleeved on the outer circumference of the sliding portion 21, and the two ends of the compression spring 23 abut against the limiting portion 22 and the limiting ring respectively, for pushing the limiting portion 22 out of the sleeve 1. Further, a guide surface 221 is formed at the end of the limiting portion 22 away from the sliding portion 21, and the guide surface 221 is an inclined surface, facilitating the extension of the limiting portion 22 into the through hole of the frame body. Further, a mounting hole 211 is arranged at the end of the sliding portion 21 away from the limiting portion 22, and the mounting hole 211 penetrates the limiting portion 22. A limiting column 24 is rotatably arranged in the mounting hole 211, and the limiting column 24 matches the first limiting slot 11 and the second limiting slot 12. When the limiting column 24 is arranged in the first limiting slot 11, the limiting portion 22 extends out of the sleeve 1, connecting the frame body; when the limiting column 24 is arranged in the second limiting slot 12, the limiting portion 22 retracts into the sleeve 1, facilitating the relative sliding of the ladder body and the frame body. Specifically, a nut 241 is arranged at one end of the limiting column 24, and a nut 242 is threadedly connected to the other end of the limiting column 24. The nut 241 and the nut 242 are arranged to prevent the limiting column 24 from sliding out of the mounting hole 211.

[0027] Continuing to refer to Figure 1 , Figure 2 and Figure 3In one or more embodiments, the limiting column 24 is connected with a handle 25. The handle 25 comprises a first branch 251, a second branch 252 symmetrically arranged with the first branch 251, and a connecting arm 253 connecting the first branch 251 and the second branch 252. A through hole matched with the limiting column 24 is formed on the first branch 251 and the second branch 252, so that the first branch 251 and the second branch 252 are sleeved outside the limiting column 24. The first branch 251 is close to the nut 242, and the second branch 252 is close to the cap 241. Further, the first branch 251 comprises an inclined part 254 connected with the connecting arm 253, and a horizontal part 255 connected with the inclined part 254, and the through hole is formed on the horizontal part 255. The horizontal part 255 of the first branch 251 is located between the nut 242 and the sleeve 1, and the horizontal part 255 of the second branch 252 is located between the cap 241 and the sleeve 1. By pulling the handle 25, the limiting column 24 is pulled out of the first limiting groove 11 or the second limiting groove 12, rotating the handle 25, the limiting column 24 is rotated to align the first limiting groove 11 or the second limiting groove 12, and loosening the handle 25, the limiting column 24 is moved into the first limiting groove 11 or the second limiting groove 12 under the driving of the compression spring 23.

[0028] In order to improve or solve the technical problems of inconvenient use of the bolt fixing structure in the prior art, the utility model provides a ladder stand. The ladder stand comprises a ladder stand body, which is adapted to be connected with a frame body in a sliding mode; the limiting fixing structure of any one of the above, the sleeve 1 of the limiting fixing structure is fixedly connected with the ladder stand body, and the pin shaft 2 of the limiting fixing structure is adapted to pass through the limiting fixing structure and be connected with the frame body.

[0029] Continuing to refer to Figure 1 , Figure 2 and Figure 3 In one or more embodiments, the ladder stand body is connected with a sliding plate, and the sleeve 1 is installed on the sliding plate; a guide rail matched with the sliding plate is arranged on the frame body, and a pin hole matched with the pin shaft 2 is formed on the frame body. The sliding plate is moved to drive the lateral movement of the ladder stand body, and when the ladder stand body is moved to a specified position, the limiting column 24 is switched into the first limiting groove 11, the limiting part 22 of the pin shaft 2 extends out of the sleeve 1 and extends into the pin hole, so as to fix the relative position of the sliding plate and the frame body.

[0030] So far, the technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without deviating from the principles of the utility model, those skilled in the art can make equivalent changes or replacements to the related technical features, and the technical schemes after the changes or replacements will all fall within the protection scope of the utility model.

Claims

1. A position-limiting fixing structure, characterized in that, include: A sleeve (1), wherein a first limiting groove (11) and a second limiting groove (12) are formed at one end of the sleeve (1), the depth of the first limiting groove (11) being greater than the depth of the second limiting groove (12); and a limiting ring is formed on the inner wall of the sleeve (1); A pin shaft (2) is retractably and rotatably mounted in the sleeve (1); the pin shaft (2) comprises a sliding portion (21) matched with the limiting ring and a limiting portion (22) matched with the sleeve (1); a compression spring (23) is provided between the limiting portion (22) and the limiting ring; a limiting column (24) matched with the first limiting groove (11) and the second limiting groove (12) is provided at one end of the sliding portion (21) away from the limiting portion (22), the limiting column (24) being configured to be switchable in the first limiting groove (11) and the second limiting groove (12) to change the length of the limiting portion (22) extending out of the sleeve (1); the limiting column (24) is connected to a handle (25).

2. The limiting and fixing structure according to claim 1, characterized in that, A mounting hole (211) matching the limiting column (24) is provided on the sliding portion (21); a nut (241) is provided at one end of the limiting column (24), and a nut (242) is threadedly connected at the other end of the limiting column (24).

3. The limiting and fixing structure according to claim 2, characterized in that, The handle (25) includes a first arm (251), a second arm (252) symmetrically arranged with the first arm (251), and a connecting arm (253) connecting the first arm (251) and the second arm (252); through holes matching the limiting column (24) are provided on the first arm (251) and the second arm (252), the first arm (251) is close to the nut (242), and the second arm (252) is close to the nut (241).

4. The limiting and fixing structure according to claim 3, characterized in that, The first support arm (251) comprises an inclined portion (254) connected to the connecting arm (253), and a horizontal portion (255) in which the through hole is formed.

5. The limiting and fixing structure according to claim 1, characterized in that, The first limiting groove (11) and the second limiting groove (12) are arranged in a cross shape.

6. The limiting and fixing structure according to claim 1, characterized in that, A guide surface (221) is formed at one end of the limiting portion (22) away from the sliding portion (21).

7. A ladder, characterized in that include: The ladder body is adapted to form a sliding connection with the frame body; The position limiting and fixing structure described in any one of claims 1 to 6, wherein the sleeve (1) of the position limiting and fixing structure is fixedly connected to the ladder body, and the pin shaft (2) of the position limiting and fixing structure is suitable for passing through the position limiting and fixing structure and being connected to the frame body.

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