Manual lifting device for trailer

Abstract

The manual lifting device comprises a base, a shell is arranged at the top of the base, a bracket is movably installed on the right side of the shell, a height adjusting assembly is arranged in the shell, and a limiting mechanism is arranged on the left side of the shell. The limiting mechanism comprises a mounting box, the mounting box is fixedly mounted on the left side of the shell, a rotating rod is mounted in the mounting box in a penetrating mode, a circular gear is fixedly mounted on the outer surface of the rotating rod, a clamping block is movably mounted at the bottom of the circular gear, and a spring is fixedly mounted between the bottom of the clamping block and the inner bottom wall of the mounting box. According to the manual lifting device for the trailer, the limiting mechanism is arranged, rotation of the circular gear is locked through the clamping block, and by means of the design, accidental rotation of the rotating rod when the rotating rod bears a heavy object is effectively prevented, so that all parts of the height adjusting assembly are kept still, and the position stability of the bracket in the using process is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of trailers, in particular to a manual lifting device for trailers. Background Art

[0002] A trailer is a tool used to transport goods, including manual trailers and electric trailers. A trailer lift is a mechanical device used to adjust the height of the trailer to facilitate loading and unloading of goods.

[0003] After searching, for example, the utility model patent with Chinese patent publication number CN215826685U discloses a lifting device for a trailer, including a frame body, a connecting frame is provided on one side of the frame body, a driving tube is provided on the connecting frame, a driving mechanism is inserted on the driving tube, and a limiting mechanism is provided in the driving tube; the driving mechanism includes: a driving rocker, a driving part, a driving rod, a limiting part and a support plate; the driving rocker is provided on the driving tube and one end is inserted into the driving tube, the driving part is provided between the driving rocker and the driving rod, the driving rod is inserted into the driving tube, the limiting part is provided in the driving tube, and the support plate is provided at the lower end of the driving rod; this utility model is a lifting device for a trailer, which is used to adjust the height of the trailer to facilitate height adjustment and installation.

[0004] However, there is a potential drawback in the design of this lifting device: when carrying a heavier object, it will cause the finger-driven rack to move downward. In this case, the height adjustment function of the lifting device may not remain stable, thereby affecting the safety and convenience of using the trailer. Therefore, a manual lifting device for the trailer is proposed. Utility Model Content

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a manual lifting device for a trailer, comprising a base, a shell provided on the top of the base, a bracket movably mounted on the right side of the shell, a height adjustment assembly provided inside the shell, and a limit mechanism provided on the left side of the shell;

[0006] The limiting mechanism includes a mounting box, a mounting box is fixedly installed on the left side of the shell, a rotating rod is installed through the interior of the mounting box, a circular gear is fixedly installed on the outer surface of the rotating rod, a clamping block is movably installed on the bottom of the circular gear, a spring is fixedly installed between the bottom of the clamping block and the inner bottom wall of the mounting box, a slider is fixedly installed on the left side of the clamping block, and a sliding groove is provided on the outer surface of the slider on the left inner wall of the mounting box.

[0007] Furthermore, the clamping block is adapted to the circular gear, a pull rod is fixedly mounted on the front side of the clamping block, and an opening is provided on the front side of the installation box and is located on the open surface of the pull rod.

[0008] Furthermore, the height adjustment assembly includes a threaded rod, the threaded rod is rotatably mounted on the inner bottom wall of the shell, and the outer surface of the threaded rod is threadedly connected to a threaded barrel.

[0009] Furthermore, a limiting block is fixedly installed on the left side of the threaded barrel, and a limiting groove is opened on the left inner wall of the shell and is located on the outer surface of the limiting block.

[0010] Furthermore, a bracket is fixedly installed between the threaded barrel and the bracket, a bevel gear 1 is fixedly installed on the outer surface of the threaded rod, and a bevel gear 2 meshing with the bevel gear 1 is fixedly installed on the outer surface of the rotating rod.

[0011] Furthermore, a limiting ring gasket located on the outer surface of the rotating rod is fixedly installed on the left side of the shell, and a hand crank disk is fixedly installed on the left end of the rotating rod.

[0012] Compared with the existing technology, the technical solution of this application has the following beneficial effects:

[0013] 1. This manual lifting device for trailers uses a limit mechanism to lock the rotation of the circular gear using a block. This design effectively prevents the rotating rod from accidentally rotating when carrying heavy objects, thereby keeping all components of the height adjustment assembly stationary and ensuring the position stability of the bracket during use.

[0014] 2. The manual lifting device for trailers has a triple locking mechanism. The self-locking property of the thread between the threaded rod and the threaded barrel, the self-locking property of the meshing between bevel gears 1 and 2, and the limiting property of the circular gear by the clamping block further improve the stability during use, reduce the risk of structural failure due to overload, and avoid safety hazards caused by relative movement between components. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0016] Figure 2 It is a cross-sectional view of the housing and the installation box of the utility model;

[0017] Figure 3 For this utility model Figure 2 A magnified view of the structure in the middle.

[0018] In the figure: 1. Base; 2. Shell; 3. Bracket; 4. Height adjustment assembly; 401. Threaded rod; 402. Threaded cylinder; 403. Limit block; 404. Limit groove; 406. Bevel gear 1; 407. Bevel gear 2; 5. Limit mechanism; 501. Mounting box; 502. Rotating rod; 503. Circular gear; 504. Block; 505. Spring; 506. Slider; 507. Slide groove. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-3 In this embodiment, a manual lifting device for a trailer includes a base 1, a shell 2 is provided on the top of the base 1, a bracket 3 is movably installed on the right side of the shell 2, a height adjustment component 4 is provided inside the shell 2, and a limiting mechanism 5 is provided on the left side of the shell 2.

[0021] The height adjustment assembly 4 includes a threaded rod 401 , a threaded barrel 402 , a limiting block 403 , a limiting groove 404 , a bevel gear 1 406 and a bevel gear 2 407 .

[0022] When adjusting the height, the hand crank is first used to drive the rotating rod 502 to rotate, and the rotating rod 502 drives the bevel gear 2 407 to rotate, and the bevel gear 2 407 drives the bevel gear 1 406 engaged with it to rotate, and the bevel gear 1 406 drives the threaded rod 401 to rotate. Under the sliding cooperation of the limit block 403 and the limit groove 404, the threaded cylinder 402 moves up and down, and the threaded cylinder 402 drives the bracket 3 to move up and down through the bracket to realize manual lifting.

[0023] In order to improve the stability of the rotating rod 502 during rotation, a limiting ring washer located on the outer surface of the rotating rod 502 is fixedly installed on the left side of the housing 2, and the rotating rod 502 can rotate in the limiting ring washer.

[0024] The limiting mechanism 5 includes an installation box 501, which is fixedly installed on the left side of the shell 2. A rotating rod 502 is installed inside the installation box 501, and a circular gear 503 is fixedly installed on the outer surface of the rotating rod 502. A clamping block 504 is movably installed at the bottom of the circular gear 503. A spring 505 is fixedly installed between the bottom of the clamping block 504 and the inner bottom wall of the installation box 501. A slider 506 is fixedly installed on the left side of the clamping block 504, and a sliding groove 507 located on the outer surface of the slider 506 is opened on the left inner wall of the installation box 501.

[0025] When the bracket 3 is adjusted to a suitable height and needs to be locked, the spring 505 is used to expand and contract to drive the block 504 to move up and down. When the block 504 moves downward, the limit on the circular gear 503 is released, and the height can be adjusted at this time. When the block 504 moves upward and is stuck on the circular gear 503, the rotation of the circular gear 503 is limited, and the circular gear 503 cannot continue to rotate, and the bracket 3 is maintained at a specific height.

[0026] By providing the slider 506 and the slide groove 507 , the stability of the block 504 during movement is improved, ensuring that the block 504 moves up and down while maintaining a specific trajectory.

[0027] In order to reduce the wear between the circular gear 503 and the block 504 when rotating, a pull rod is fixedly installed on the front side of the block 504, and the block 504 is pulled downward through the opening so that the block 504 no longer contacts the circular gear 503.

[0028] Among them, the threaded rod 401 is threadedly connected to the threaded barrel 402, the bevel gear 1 406 and the bevel gear 2 407 are meshed, and the circular gear 503 and the block 504 are engaged, so that the device has a triple locking mechanism. Even if the bracket 3 is overloaded, it can be kept at a specific height and will not move.

[0029] In summary, the manual lifting device for trailers, by setting a limit mechanism 5, uses the block 504 to lock the rotation of the circular gear 503. This design effectively prevents the rotating rod 502 from accidentally rotating when carrying heavy objects, thereby keeping all components of the height adjustment assembly 4 stationary, ensuring the position stability of the bracket 3 during use.

[0030] Furthermore, the manual lifting device for trailers has a triple locking mechanism, including the self-locking property of the threads between the threaded rod 401 and the threaded barrel 402, the self-locking property of the meshing between the bevel gear 1 406 and the bevel gear 2 407, and the limiting property of the circular gear 503 by the block 504. These further improve the stability during use, reduce the risk of structural failure due to overload, and avoid safety hazards caused by relative movement between components.

[0031] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0032] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A manual lifting device for a trailer, comprising a base (1), characterized in that: A shell (2) is provided on the top of the base (1), a bracket (3) is movably mounted on the right side of the shell (2), a height adjustment component (4) is provided inside the shell (2), and a limiting mechanism (5) is provided on the left side of the shell (2); The limiting mechanism (5) comprises a mounting box (501), the mounting box (501) is fixedly mounted on the left side of the housing (2), a rotating rod (502) is installed through the interior of the mounting box (501), a circular gear (503) is fixedly mounted on the outer surface of the rotating rod (502), a clamping block (504) is movably mounted on the bottom of the circular gear (503), a spring (505) is fixedly mounted between the bottom of the clamping block (504) and the inner bottom wall of the mounting box (501), a slider (506) is fixedly mounted on the left side of the clamping block (504), and a sliding groove (507) is provided on the left inner wall of the mounting box (501) and is located on the outer surface of the slider (506).

2. A manual lifting device for a trailer according to claim 1, characterized in that: The clamping block (504) is matched with the circular gear (503), a pull rod is fixedly mounted on the front side of the clamping block (504), and an opening is provided on the surface of the pull rod on the front side of the installation box (501).

3. The manual lifting device for a trailer according to claim 1, characterized in that: The height adjustment assembly (4) comprises a threaded rod (401), the threaded rod (401) is rotatably mounted on the inner bottom wall of the housing (2), and the outer surface of the threaded rod (401) is threadedly connected to a threaded barrel (402).

4. A manual lifting device for a trailer according to claim 3, characterized in that: A limiting block (403) is fixedly installed on the left side of the threaded barrel (402), and a limiting groove (404) located on the outer surface of the limiting block (403) is provided on the left inner wall of the shell (2).

5. The manual lifting device for a trailer according to claim 3, characterized in that: A bracket is fixedly installed between the threaded cylinder (402) and the bracket (3), a bevel gear 1 (406) is fixedly installed on the outer surface of the threaded rod (401), and a bevel gear 2 (407) meshing with the bevel gear 1 (406) is fixedly installed on the outer surface of the rotating rod (502).

6. The manual lifting device for a trailer according to claim 1, characterized in that: A limiting ring washer located on the outer surface of the rotating rod (502) is fixedly mounted on the left side of the housing (2), and a hand crank is fixedly mounted on the left end of the rotating rod (502).

Images