Anti-dislocation chain wheel crank

Abstract

The utility model relates to the technical field of chain wheel cranks and discloses an anti-dislocation chain wheel crank which comprises a plurality of chain wheels, cranks are arranged on the two sides of the chain wheels, a baffle disc is arranged on one side face of each chain wheel, a circle of connecting plate is fixedly connected to the inner ring of each baffle disc, and the connecting plates are arranged on the two sides of the chain wheels. A threaded hole is formed in the surface of each connecting plate, a plurality of threaded grooves corresponding to the threaded holes are formed in the surface of the chain wheel on the outermost side, and bolts are installed between the corresponding threaded holes and the threaded grooves in a threaded mode. The inner portions of the two cranks are both hollow, openings are formed in one ends of the two cranks, extension handles are installed in the two cranks in a sliding mode, the overall length of the cranks and the extension handles can be rapidly and conveniently adjusted in the using process, and the multifunctional folding chair is suitable for being used by different crowds and high in applicability.

Description

Technical Field

[0001] This utility model relates to the field of sprocket and crank technology, specifically to an anti-misalignment sprocket and crank. Background Technology

[0002] A sprocket is a wheel with interlocking chain teeth, used to mesh with precisely pitched blocks on chain links or cables. Sprockets are widely used in mechanical transmissions in industries such as chemical, textile machinery, escalators, wood processing, automated parking garages, agricultural machinery, food processing, instrumentation, and petroleum. They are also bicycle parts, as are cranks. Bicycle crank assemblies generally consist of crank arms and sprockets.

[0003] A search revealed a misalignment prevention sprocket crank (publication number CN 219774739 U). The key technical features are: a sprocket with a first crank on one side and a second crank on the other side; and an anti-misalignment component located inside the sprocket to prevent chain misalignment. The anti-misalignment component includes: a first limiting ring on one side of the sprocket and a second limiting ring on the other side; a plurality of first threaded posts fixedly mounted on one side of the second limiting ring; and a plurality of first limiting holes on one side of the sprocket, which movably engage with the first threaded posts. By coordinating the sprocket, first crank, second limiting ring, second crank, first limiting ring, and first limiting holes, the chain outside the sprocket can be limited, preventing accidental chain misalignment.

[0004] However, the aforementioned crank still has some shortcomings in use. Its length is fixed and cannot be quickly adjusted. It cannot be flexibly adjusted according to the body shape and usage habits of different users, which results in poor applicability to different groups of people and cannot well meet diverse usage needs. Utility Model Content

[0005] In view of the shortcomings of the existing technology, this utility model provides an anti-misalignment sprocket crank, which solves the problem that the length of the crank is fixed and cannot be quickly adjusted, nor can it be flexibly adjusted according to the body shape and usage habits of different users. This results in poor applicability to different groups of people and cannot meet the diverse usage needs.

[0006] This utility model provides the following technical solution: an anti-misalignment sprocket crank, including sprockets, the number of sprockets being multiple, cranks being provided on both sides of the multiple sprockets, a baffle being provided on one side of the sprocket, a connecting plate being fixedly connected to the inner ring of the baffle, threaded holes being provided on the surface of each connecting plate, and multiple threaded grooves corresponding to the threaded holes being provided on the surface of the outermost sprocket, with bolts threadedly installed between the corresponding threaded holes and the threaded grooves;

[0007] Both cranks are hollow inside and have an opening at one end, and an extension handle is slidably installed inside both cranks.

[0008] Preferred technical solution 1: The inner bottom walls of both cranks are rotatably mounted with screws, and the surfaces of both extension shanks are provided with threaded holes. The two extension shanks are threaded onto the surfaces of the two screws through the two threaded holes respectively.

[0009] Preferred technical solution 2: Limiting blocks are fixedly connected to the inner side walls of both cranks, and limiting grooves matching the limiting blocks are opened on both sides of both extension shanks, and the limiting blocks can slide inside the corresponding limiting grooves.

[0010] Preferred technical solution three: The top ends of both screws extend to the outside of the connected crank and are fixedly connected to a rotating disk.

[0011] Preferred technical solution four: a foot pedal is installed at one end of each of the two extension handles, and a rubber sleeve is fitted on the surface of each foot pedal.

[0012] Preferred technical solution five: a protective cover is provided at one end of each of the two cranks, the surface of each of the two protective covers is provided with external threads, a groove is provided at one end of each of the two cranks, the inner wall of each of the two grooves is provided with internal threads that match the external threads, and a rotating protrusion is provided on the upper surface of each of the two protective covers.

[0013] Compared with the prior art, this utility model provides an anti-misalignment sprocket crank with the following advantages: During use, the sprocket engages with the chain. When riding, the chain is limited by the stop plate to prevent it from falling off to one side. Simultaneously, the position of the pedals can be adjusted for different users. By rotating the protective cover, it can be removed from the crank. Then, rotating the screw causes the extension bar to extend from inside the crank under the constraint of the limiting block and limiting groove, thereby adjusting the overall length of the crank and extension bar. This allows for quick adjustment of the pedal position and is suitable for different users. This utility model allows for quick and convenient adjustment of the overall length of the crank and extension bar, making it suitable for various users and highly adaptable. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is an exploded view of the sprocket and baffle structure of this utility model;

[0016] Figure 3 This is a cross-sectional view of the internal structure of the crank and extension shank of this utility model.

[0017] In the diagram: 1. Sprocket; 2. Crank; 3. Baffle; 4. Connecting plate; 5. Threaded hole; 6. Threaded groove; 7. Bolt; 8. Extension shank; 9. Screw; 10. Threaded hole; 11. Limiting block; 12. Limiting groove; 13. Rotating disc; 14. Protective cover; 15. Groove; 16. Foot pedal. Detailed Implementation

[0018] Please see Figure 1-3 ,

[0019] Example 1: An anti-misalignment sprocket crank includes a sprocket 1, the number of sprockets 1 is multiple, and a crank 2 is provided on both sides of the multiple sprockets 1. A baffle 3 is provided on one side of the sprocket 1. A connecting plate 4 is fixedly connected to the inner ring of the baffle 3. A threaded hole 5 is opened on the surface of each connecting plate 4. A plurality of threaded grooves 6 corresponding to the threaded holes 5 are opened on the surface of the outermost sprocket 1. A bolt 7 is threaded between the corresponding threaded hole 5 and the threaded groove 6.

[0020] Both cranks 2 are hollow inside and have an opening at one end. An extension handle 8 is slidably installed inside both cranks 2.

[0021] Example 2: The difference between this example and Example 1 is that, in this example, screws 9 are rotatably installed on the inner bottom walls of both cranks 2, and threaded holes 10 are opened on the surfaces of both extension shanks 8. The two extension shanks 8 are threaded onto the surfaces of the two screws 9 through the two threaded holes 10 respectively. By rotating the screws 9, the extension shanks 8 can be driven to extend out from the inside of the cranks 2, and their overall length can be adjusted.

[0022] Example 3: The difference between this example and Example 1 is that, in this example, the inner side walls of the two cranks 2 are fixedly connected with limit blocks 11, and the two sides of the two extension handles 8 are provided with limit grooves 12 that match the limit blocks 11. The limit blocks 11 can slide inside the corresponding limit grooves 12, which facilitates the restriction of the movement of the extension handles 8 and makes its movement more stable.

[0023] Example 4: The difference between this example and Example 1 is that the top ends of both screws 9 extend to the outside of the connected crank 2 and are fixedly connected to a rotating disk 13, which facilitates operation by the user.

[0024] Example 5: The difference between this example and Example 1 is that, in this example, a foot pedal 16 is installed at one end of each of the two extension handles 8, and a rubber sleeve is fitted on the surface of each foot pedal 16.

[0025] Example 6: The difference between this example and Example 1 is that, in this example, a protective cover 14 is provided at one end of each of the two cranks 2, the surface of each of the two protective covers 14 is provided with external threads, a groove 15 is provided at one end of each of the two cranks 2, the inner wall of each of the two grooves 15 is provided with an internal thread that matches the external thread, and a rotating protrusion is provided on the upper surface of each of the two protective covers 14 to prevent the user from accidentally touching the rotating disk 13 of the screw 9.

[0026] In summary, this anti-misalignment sprocket crank allows the sprocket 1 to engage with the chain during use. When riding, the chain is limited by the stop plate 3 to prevent it from falling off to one side. Furthermore, the position of the pedal 16 can be adjusted for different users. By rotating the protective cover 14, it can be removed from the crank 2. Then, by rotating the screw 9, the extension handle 8 extends from inside the crank 2 under the constraint of the limit block 11 and the limit groove 12, thus adjusting the overall length of the crank 2 and the extension handle 8. This allows for quick adjustment of the position of the pedal 16, making it suitable for different users.

Claims

1. A misalignment-proof sprocket crank comprising a sprocket (1), characterized in that: There are multiple sprockets (1), and cranks (2) are provided on both sides of each sprocket (1). A baffle (3) is provided on one side of each sprocket (1). A connecting plate (4) is fixedly connected to the inner ring of the baffle (3). Each connecting plate (4) has a threaded hole (5) on its surface. The outermost sprocket (1) has multiple threaded grooves (6) corresponding to the threaded holes (5) on its surface. Bolts (7) are threaded between the corresponding threaded holes (5) and the threaded grooves (6). Both cranks (2) are hollow inside and have an opening at one end. An extension handle (8) is slidably installed inside both cranks (2).

2. The anti-misalignment sprocket crank of claim 1, wherein: Both cranks (2) have screws (9) rotatably mounted on their inner bottom walls, and both extension shanks (8) have threaded holes (10) on their surfaces. The two extension shanks (8) are threaded onto the surfaces of the two screws (9) through the two threaded holes (10).

3. The anti-misalignment sprocket crank of claim 1, wherein: Limiting blocks (11) are fixedly connected to the inner side walls of the two cranks (2), and limiting grooves (12) matching the limiting blocks (11) are opened on both sides of the two extension handles (8). The limiting blocks (11) can slide inside the corresponding limiting grooves (12).

4. The anti-misalignment sprocket crank of claim 1, wherein: The top ends of both screws (9) extend to the outside of the connected crank (2) and are fixedly connected to a rotating disk (13).

5. The anti-misalignment sprocket crank of claim 1, wherein: Each of the two extension handles (8) is fitted with a foot pedal (16) at one end, and each foot pedal (16) is covered with a rubber sleeve.

6. The anti-misalignment sprocket crank of claim 1, wherein: Each of the two cranks (2) is provided with a protective cover (14) at one end. The surface of each of the two protective covers (14) is provided with an external thread. Each of the two cranks (2) is provided with a groove (15) at one end. The inner wall of each of the two grooves (15) is provided with an internal thread that matches the external thread. The upper surface of each of the two protective covers (14) is provided with a rotating protrusion.

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