Quick-release crank

Abstract

The utility model relates to the technical field of bicycles, in particular to a quick-release crank which comprises a middle five-way joint, a middle shaft is mounted in the middle five-way joint, bearings are arranged on the two sides of the center of the outer wall of the middle shaft and in the middle five-way joint, a left bearing fixing sleeve is slidably connected to the left side of the middle five-way joint, and a right bearing fixing sleeve is slidably connected to the right side of the middle five-way joint. A left bearing fixing sleeve is slidably connected to the left side of the middle five-way joint, a right bearing fixing sleeve is slidably connected to the right side of the middle five-way joint, protruding blocks are arranged on the outer wall of the left bearing fixing sleeve and the outer wall of the right bearing fixing sleeve, grooves are formed in the positions, corresponding to the protruding blocks, of the outer wall of the middle five-way joint, and a left crank is installed on the outer wall of the left bearing fixing sleeve. Disassembling is conducted through the meshing clamping groove in the device, and the problems that steel balls are installed in an existing middle five-way joint, the service life of the steel balls is short, riding is heavy, the steel balls cannot rotate after being released, an existing crank needs a professional tool to be disassembled, repairing and disassembling are inconvenient or disassembling cannot be conducted, and consequently the whole bicycle or scooter is scrapped are solved.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, specifically to a quick-release crank. Background Technology

[0002] The bottom bracket is a commonly used component in bicycles, but the existing bottom bracket still has shortcomings. Specifically, the existing bottom bracket contains steel balls, which have a short lifespan, make riding heavy, and cannot be rotated after the steel balls come off. The existing crank requires special tools to remove, making repair and disassembly inconvenient or impossible, which can lead to the complete scrapping of the bicycle or scooter.

[0003] Therefore, a quick-release crank is needed to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to provide a quick-release crank to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A quick-release crank includes a bottom bracket, a bottom shaft is installed inside the bottom bracket, bearings are provided on both sides of the center of the outer wall of the bottom shaft and inside the bottom bracket, a left bearing retaining sleeve is slidably connected to the left side of the bottom bracket, a right bearing retaining sleeve is slidably connected to the right side of the bottom bracket, both the left and right bearing retaining sleeves have protrusions on their outer walls, grooves are formed on the outer wall of the bottom bracket at the corresponding positions of the protrusions, a left crank is installed on the outer wall of the left bearing retaining sleeve, a right crank is installed on the outer wall of the right bearing retaining sleeve, a fixing screw is provided inside the left and right bearing retaining sleeves, a threaded rod is installed inside the right crank, a first handle is fixedly connected to the outer wall of the threaded rod and to the right side of the right crank, a spring is provided inside the first handle near the threaded rod, a meshing tooth is slidably connected inside the first handle to the left of the spring, a second handle is installed on the outer wall of the first handle, and a slot is provided on the outer wall of the right crank near the meshing tooth.

[0007] As a preferred embodiment of this utility model, the center five-way valve has a T-shaped structure design, and multiple sets of springs and occlusal teeth are provided.

[0008] As a preferred embodiment of this utility model, the central shaft extends through and to the outside of the center five-way connector, the central shaft is hollow, and the cleaving teeth extend through and to the outside of the second handle.

[0009] As a preferred embodiment of this utility model, the fixing screw is provided in three sets, and the fixing screw passes through the left bearing fixing sleeve and extends to the outside of the right bearing fixing sleeve.

[0010] As a preferred embodiment of this utility model, the threaded rod passes through the right crank and the central shaft in sequence and extends into the left crank. The connection between the threaded rod and the left crank is a threaded connection.

[0011] As a preferred embodiment of this utility model, the shape of the groove is adapted to the shape of the protrusion, the groove and the protrusion are connected by a sliding connection, and the outer wall of the occlusal tooth is provided with two inclined surfaces of different sizes.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. In this utility model, a quick-release crank is designed, and the engagement teeth in the device are used for disassembly. During disassembly, the second handle is rotated counterclockwise, which drives the internal engagement teeth to rotate counterclockwise. The counterclockwise rotating engagement teeth retract, and the smaller slope of the outer wall of the engagement teeth no longer locks the slot. The first handle is rotated, which drives the threaded rod to unscrew the left crank, thus removing the left and right cranks. During installation, the first handle is rotated clockwise, which drives the internal engagement teeth to rotate clockwise. The engagement teeth inside the first handle are popped out by a spring, and the larger slope of the popped engagement teeth locks with the slot on the right crank, thus completing the installation. This solves the problems of existing bottom brackets with steel balls installed inside, which have short service life, cause heavy riding, and cannot be rotated after the steel balls are disengaged. Existing crank disassembly requires professional tools, making repair and disassembly inconvenient or impossible, leading to the scrapping of the entire bicycle or scooter. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is an exploded three-dimensional structural diagram of the present invention;

[0016] Figure 3 This is a schematic diagram of the three-dimensional structure of the occlusal tooth of this utility model.

[0017] In the diagram: 1. Center bottom bracket; 2. Center shaft; 3. Bearing; 4. Left bearing sleeve; 5. Right bearing sleeve; 6. Protrusion; 7. Groove; 8. Left crank; 9. Right crank; 10. Fixing screw; 11. Threaded rod; 12. First handle; 13. Spring; 14. Engaging teeth; 15. Second handle; 16. Slot. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0019] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, and several embodiments of the utility model will be provided. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and complete.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] For examples, please refer to Figure 1-3 This utility model provides a technical solution:

[0023] A quick-release crank includes a bottom bracket 1, a bottom shaft 2 installed inside the bottom bracket 1, bearings 3 on both sides of the center of the outer wall of the bottom shaft 2 and inside the bottom bracket 1, a left bearing retaining sleeve 4 slidably connected to the left side of the bottom bracket 1, and a right bearing retaining sleeve 5 slidably connected to the right side of the bottom bracket 1, both the left and right bearing retaining sleeves 4 and 5 having protrusions 6 on their outer walls, and grooves 7 formed on the outer wall of the bottom bracket 1 at corresponding positions of the protrusions 6, a left crank 8 installed on the outer wall of the left bearing retaining sleeve 4, and a right crank 9 installed on the outer wall of the right bearing retaining sleeve 5. The left bearing retaining sleeve 4 and the right bearing retaining sleeve 5 are provided with a retaining screw 10. The right crank 9 is installed with a threaded rod 11. The outer wall of the threaded rod 11 and the right side of the right crank 9 are fixedly connected to a first handle 12. The first handle 12 is provided with a spring 13 near the threaded rod 11. The first handle 12 is slidably connected with a biting tooth 14 on the left side of the spring 13. The outer wall of the first handle 12 is installed with a second handle 15. The outer wall of the right crank 9 and the biting tooth 14 are provided with a groove 16.

[0024] The bottom bracket 1 has a T-shaped structure design. Multiple sets of springs 13 and engagement teeth 14 are provided. The central shaft 2 passes through and extends beyond the bottom bracket 1. The central shaft 2 is a hollow design. Engagement teeth 14 pass through and extend beyond the second handle 15. Three sets of fixing screws 10 are provided. The fixing screws 10 pass through the left bearing fixing sleeve 4 and extend beyond the right bearing fixing sleeve 5. The threaded rod 11 passes through the right crank 9 and the central shaft 2 in sequence and extends into the left crank 8. The threaded rod 11 is connected to the left crank 8 by a threaded connection. The shape of the groove 7 matches the shape of the protrusion 6. The groove 7 and the protrusion 6 are connected by a sliding connection. The outer wall of the engagement tooth 14 has two slopes of different sizes. For disassembly, rotate the first... The second handle 15 drives the internal engagement teeth 14 to rotate counterclockwise. The counterclockwise rotating engagement teeth 14 will retract, and the smaller slope of the engagement teeth 14 will no longer lock the slot 16. Rotate the first handle 12, which drives the threaded rod 11 to unscrew the left crank 8. Remove the left crank 8 and right crank 9. During installation, insert the threaded rod 11 into the left crank 8 and right crank 9. Rotate the first handle 12 clockwise, which drives the internal engagement teeth 14 to rotate clockwise. The engagement teeth 14 inside the first handle 12 will be popped out by the spring 13. The larger slope of the popped engagement teeth 14 will lock into the slot 16 on the right crank 9, thus completing the installation.

[0025] The working process of this utility model is as follows: When the quick-release crank designed in this solution is in operation, during disassembly, the second handle 15 is rotated counterclockwise. The second handle 15 drives the internal engagement teeth 14 to rotate counterclockwise. The counterclockwise rotating engagement teeth 14 will retract, and the smaller slope of the outer wall of the engagement teeth 14 will no longer lock the slot 16. The first handle 12 is rotated, and the first handle 12 drives the threaded rod 11 to unscrew the left crank 8, removing the left crank 8 and the right crank 9. During installation, the threaded rod 11 is inserted into the left crank 8 and the right crank 9. The first handle 12 is rotated clockwise, and the first handle 12 drives the internal engagement teeth 14 to rotate clockwise. The engagement teeth 14 inside the first handle 12 will be popped out by the spring 13. The larger slope of the popped engagement teeth 14 will lock with the slot 16 on the right crank 9, thus completing the installation.

[0026] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quick-release crank, comprising a bottom bracket (1), characterized in that: The center jack (1) is equipped with a central shaft (2). Bearings (3) are provided on both sides of the center of the outer wall of the central shaft (2) and inside the center jack (1). A left bearing fixing sleeve (4) is slidably connected to the left side of the center jack (1), and a right bearing fixing sleeve (5) is slidably connected to the right side of the center jack (1). Both the left bearing fixing sleeve (4) and the right bearing fixing sleeve (5) have protrusions (6) on their outer walls. A groove (7) is provided on the outer wall of the center jack (1) at the corresponding position of the protrusions (6). A left crank (8) is installed on the outer wall of the left bearing fixing sleeve (4), and a right crank (9) is installed on the outer wall of the right bearing fixing sleeve (5). The left bearing... A fixing screw (10) is provided inside the fixing sleeve (4) and the right bearing fixing sleeve (5). A threaded rod (11) is installed inside the right crank (9). A first handle (12) is fixedly connected to the outer wall of the threaded rod (11) and to the right side of the right crank (9). A spring (13) is provided inside the first handle (12) and near the threaded rod (11). A meshing tooth (14) is slidably connected inside the first handle (12) and to the left side of the spring (13). A second handle (15) is installed on the outer wall of the first handle (12). A groove (16) is provided on the outer wall of the right crank (9) and near the meshing tooth (14).

2. A quick-release crank according to claim 1, characterized in that: The five-way connector (1) is designed with a T-shaped structure, and multiple sets of springs (13) and occlusal teeth (14) are provided.

3. A quick-release crank according to claim 1, characterized in that: The central shaft (2) extends through and out of the center five-way connector (1), the central shaft (2) is hollow, and the occlusal tooth (14) extends through and out of the second handle (15).

4. A quick-release crank according to claim 1, characterized in that: The fixing screw (10) is provided in three sets, and the fixing screw (10) passes through the left bearing fixing sleeve (4) and extends to the outside of the right bearing fixing sleeve (5).

5. A quick-release crank according to claim 1, characterized in that: The threaded rod (11) passes through the right crank (9), the central shaft (2) in sequence and extends into the left crank (8). The threaded rod (11) and the left crank (8) are connected by a threaded connection.

6. A quick-release crank according to claim 1, characterized in that: The shape of the groove (7) is adapted to the shape of the protrusion (6), and the groove (7) and the protrusion (6) are connected by a sliding connection. The outer wall of the occlusal tooth (14) is provided with two slopes of different sizes.

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