Quick-release crank with safety and controllable functions

Abstract

This application relates to a quick-release crank with safe and controllable functions, belonging to the technical field of bicycle cranks. It includes a crank body and a bottom bracket. One end of the crank body is inserted into the bottom bracket, and the other end is used to connect to the pedal. The crank body is provided with a pressing component and a fixing component. The pressing component is slidably disposed on the crank body, sliding towards or away from the bottom bracket. The pressing component is used to lock or separate the crank body from the bottom bracket. The fixing component is located on the side of the crank body away from the bottom bracket and is used to lock and release the pressing component. This application achieves safe and controllable quick disassembly of the crank.

Description

Technical Field

[0001] This application relates to the technical field of bicycle cranks, and in particular to quick-release cranks with safety and controllable functions. Background Technology

[0002] Bicycles are a common mode of transportation; cycling is not only energy-saving and environmentally friendly, but also good for physical health. The cranks of a bicycle are a crucial component connecting the pedals and the bottom bracket, transmitting the pedaling force to propel the bicycle forward. While the bicycle crank structure is robust and durable, installing and removing the cranks requires specialized tools and professional skills. For ordinary users, the installation and removal process is cumbersome and complex, meaning reliance on professional services is necessary, adding extra time and cost, and limiting the portability and storage flexibility of bicycles in modern life.

[0003] The outer length of the crank and pedals is second only to the width of the handlebars. This is especially problematic for users with limited storage space, making storage and transportation in confined spaces very difficult. In densely populated urban environments, where storage space and transportation options are limited, the portability and ease of storage of bicycles become particularly important. Furthermore, in the children's bicycle market, smaller-diameter children's bicycles can be used as balance bikes after the cranks are removed, providing customers with a zero-cost functional expansion.

[0004] Therefore, it is particularly urgent to achieve a bicycle crank that can maintain its function through innovative structural design, while also enabling convenient and quick installation and removal of the crank to meet the storage needs of bicycles in limited spaces, adapt to the fast-paced life of modern cities, and provide zero-cost functional expansion for children's bicycle users. Utility Model Content

[0005] In order to achieve safe and controllable quick disassembly of the crank, this application provides a quick-release crank with safe and controllable functions.

[0006] The quick-release crank with safety and controllability provided in this application adopts the following technical solution:

[0007] A quick-release crank with safe and controllable functions includes a crank body and a bottom bracket. One end of the crank body is inserted into the bottom bracket, and the other end is used to connect to the pedal. The crank body is provided with a pressing component and a fixing component. The pressing component is slidably disposed on the crank body and is slidably disposed in a direction close to or away from the bottom bracket. The pressing component is used to lock or separate the crank body from the bottom bracket. The fixing component is located on the side of the crank body away from the bottom bracket and is used to lock or release the function of the pressing component.

[0008] By adopting the above technical solution, and by setting up a pressing component and a fixing part, the pressing component can slide to lock or separate the crank body from the bottom bracket. Tightening or loosening the fixing part restricts the sliding of the pressing component, achieving the purpose of releasing and limiting the quick-release function. When it is necessary to fix the crank, tightening the fixing part can maintain a high-strength fixation state and prevent the crank from falling off due to accidental contact with the pressing part, meeting international safety standards. When it is necessary to disassemble the crank, loosening the fixing part without completely removing the screws, and pressing the fixing part and the pressing part, achieves safe and controllable quick disassembly of the crank, making the operation simpler and faster, solving the problem of cumbersome existing crank disassembly.

[0009] Optionally, the crank body has a through hole, a groove, and a first positioning hole. The groove is located at the end face of the crank body that extends into the central shaft. The through hole passes through the crank body and connects to the groove. The first positioning hole is located on the groove wall. A second positioning hole is provided on the central shaft. When one end of the crank body is inserted into the central shaft, the first positioning hole and the second positioning hole coincide. The pressing assembly includes a pressing member, a stop block, and a ball. One end of the pressing member passes through the through hole and extends into the groove, and is detachably connected to the stop block. The stop block is entirely or partially located in the groove, and the outer wall of the stop block slides against the inner wall of the groove. The ball and the first positioning hole are both located between the stop block and the bottom of the groove. When the crank body is locked to the central shaft, the stop block pushes the ball to simultaneously insert into the first positioning hole and the second positioning hole. The part of the ball located in the groove simultaneously abuts against the outer wall of the stop block.

[0010] Optionally, one end of the pressing element, which penetrates the through hole and extends into the groove, is connected to the stop block by a thread or by direct through-hole connection.

[0011] By adopting the above technical solution, through holes, grooves, and a first positioning hole are opened on the crank body, and a second positioning hole is opened on the bottom bracket. With the cooperation of the pressing component, stop, and ball bearings, when the crank body is locked to the bottom bracket, the stop pushes the ball bearing to simultaneously insert into the first and second positioning holes. The contact between the ball bearing and the stop ensures a stable and reliable connection and locking between the crank body and the bottom bracket. The lock can be easily released by pressing the pressing component, making operation simple. To release the lock, press the pressing component. At this time, the stop moves away from the ball bearing, increasing the space between the stop and the bottom of the groove, allowing the ball bearing to slide out of the first and second positioning holes. Then, simply pull the crank body outwards to disengage from the bottom bracket.

[0012] Optionally, a card is embedded in the pressing member, the card is located on the side of the stop block away from the ball, and the card abuts against the stop block.

[0013] By adopting the above technical solution, a card is embedded in the pressing part, and the card abuts against the stop block, thus realizing a detachable connection between the stop block and the pressing part. That is, the end of the pressing part passes through the stop block and is embedded in the card. The card works with the pressing part body to clamp and limit the stop block.

[0014] Optionally, the fixing member is threadedly connected to the end face of the pressing member away from the stop block. When the fixing member is tightened, the fixing member abuts against the outer wall of the crank body, and the distance between the fixing member and the outer wall of the crank body is the sliding distance of the pressing member in the through hole.

[0015] By adopting the above technical solution, the fixing part and the pressing part are threadedly connected. When tightened, they abut against the outer wall of the crank body. The distance between the fixing part and the outer wall of the crank body determines the sliding distance of the pressing part. When the crank body needs to be disassembled, the fixing part is loosened to leave space for the sliding of the pressing part. When the crank body does not need to be disassembled, the fixing part is tightened. At this time, the pressing part cannot move, ensuring the firm connection between the crank body and the bottom bracket. The locking and disassembly operations of the crank body and the bottom bracket are accurately controlled, making the quick release function safer and more controllable.

[0016] Optionally, a concealed groove is provided on the crank body, and when the fixing member is tightened, the part of the fixing member outside the pressing member is located in the concealed groove.

[0017] By adopting the above technical solution, the fixing component does not protrude additionally from the surface of the crank body. On the one hand, it can protect the fixing component from being accidentally touched or damaged by external forces. On the other hand, it makes the overall appearance of the crank more concise and smooth, reducing possible interference during riding.

[0018] Optionally, a limiting groove is provided on the crank body, the center lines of the limiting groove and the through hole are collinear, and the inner diameter of the limiting groove is larger than the inner diameter of the through hole. A snap-fit ​​component is fixed at the end of the pressing component away from the stop block. The cross-section of the snap-fit ​​component is non-circular, and the circumferential sidewall of the snap-fit ​​component slides against the inner wall of the limiting groove, with the sliding direction following the sliding direction of the pressing component.

[0019] Optionally, at least one guide protrusion is provided on the inner wall of the limiting groove along the sliding direction of the pressing component. Correspondingly, a groove matching the guide protrusion is provided on the end face of the pressing component away from the stop block, so that the pressing component slides against the inner wall of the limiting groove and the sliding direction is in line with the sliding direction of the pressing component.

[0020] By adopting the above technical solution, the snap-fit ​​component and guide protrusion slide against the inner wall of the limiting groove and the direction is in line with the sliding direction of the pressing component, which restricts the rotation of the pressing component and ensures that the pressing component can only slide in the predetermined direction, making the pressing operation more stable and accurate, and improving the operational reliability of the quick-release structure. The non-circular design of the snap-fit ​​component cross section and the limiting groove makes the snap-fit ​​and limiting of the pressing component and the crank body more flexible. It can be elliptical or flower-shaped, which enhances the applicability.

[0021] Optionally, multiple balls are provided, with adjacent balls spaced apart along the circumference of the stop block.

[0022] By adopting the above technical solution, multiple ball bearings are set and distributed at intervals along the circumference of the stop block, increasing the contact points and force uniformity when the crank body and the bottom bracket are locked, improving the stability and firmness of the connection, and enabling it to better withstand various forces during riding, thus ensuring riding safety.

[0023] Optionally, the pressing member is provided with a spring on its ring sleeve, the spring being used to push the pressing member to slide away from the central axis.

[0024] By adopting the above technical solution, a spring is looped around the pressing part. The spring pushes the pressing part to slide away from the central axis. It can automatically reset after pressing, which is convenient for the next operation. At the same time, in the non-pressing state, the pressing component can maintain a stable locked state, which enhances the practicality and convenience of the quick-release crank structure.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. Through the unique pressing component and positioning structure design, the crank body and bottom bracket can be locked and separated quickly and reliably. Compared with the traditional installation and disassembly methods, it greatly improves the operating efficiency and meets the user's need for convenient use.

[0027] 2. The threaded connection between the fixing part and the pressing part enables full safety control of the crank assembly and disassembly function. This effectively prevents accidental crank detachment caused by accidental contact with the fixing part, and completely limits the quick-release function of the crank when the fixing part is tightened, thus meeting the international safety requirements for children's bicycles.

[0028] 3. The design of the cooperation between the components, such as the control of the sliding distance of the pressing component by the fixing component, the limiting groove and the snap-fit ​​component, and the guide protrusion limiting the sliding direction of the pressing component, effectively improves the safety and stability of the quick-release crank during use and reduces the safety risks caused by loose components or misoperation.

[0029] 4. The quick-release crank structure design balances practicality and aesthetics. Designs such as concealed grooves reduce the adverse effects of protruding parts, while spring return and other designs enhance ease of use, improving the overall quality of the product and the user experience. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application from the left side.

[0031] Figure 2 This is a schematic diagram of the overall structure of an embodiment of this application from the right side.

[0032] Figure 3This is a sectional view of the crank body and bottom bracket after installation;

[0033] Figure 4 It is an exploded view of the crank body and bottom bracket during installation;

[0034] Figure 5 This is a schematic diagram of the structure of a single crank body;

[0035] Figure 6 These are schematic diagrams of different shaped guide protrusions.

[0036] In the diagram, 1. Crank body; 11. Through hole; 12. Slide groove; 13. First positioning hole; 14. Concealed groove; 15. Limiting groove; 2. Central shaft; 21. Second positioning hole; 3. Pressing assembly; 31. Pressing part; 32. Stop block; 33. Ball bearing; 4. Fixing part; 5. Card; 6. Snap-fit ​​part; 61. Guide protrusion; 7. Spring. Detailed Implementation

[0037] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0038] This application discloses a quick-release crank with safe and controllable functions.

[0039] refer to Figure 1 The quick-release crank with safety and controllable functions includes a crank body 1 and a bottom bracket 2. One end of the crank body 1 is inserted into the bottom bracket 2, and the other end is used to connect to the pedal. The bottom bracket 2 is mounted in the bottom bracket tube of the frame via bearings.

[0040] refer to Figure 2 and Figure 3 A pressing component 3 and a fixing component 4 are provided on the crank body 1. The pressing component 3 is slidably disposed on the crank body 1 and can slide in the direction close to or away from the central shaft 2 to lock or separate the crank body 1 from the central shaft 2. The fixing component 4 is located on the side of the crank body 1 away from the central shaft 2 and is used to control whether the pressing component 3 can slide.

[0041] refer to Figure 3 and Figure 4 The crank body 1 is provided with a concealed groove 14, a limiting groove 15, a through hole 11, a sliding groove 12, and a first positioning hole 13. Along the direction close to the central axis, the concealed groove 14, the limiting groove 15, the through hole 11, and the sliding groove 12 are arranged in sequence, thus penetrating the crank body 1. The center lines of the four are collinear. The inner diameters of the concealed groove 14, the limiting groove 15, and the through hole 11 decrease in sequence, and the inner diameter of the sliding groove 12 is larger than the inner diameter of the through hole 11.

[0042] refer to Figure 3 , Figure 4 and Figure 5The slide groove 12 is located at the end face of the crank body 1 that extends into the central shaft 2, and the first positioning hole 13 is located on the groove wall of the slide groove 12. The central shaft 2 is provided with a second positioning hole 21. When one end of the crank body 1 is inserted into the central shaft 2, the first positioning hole 13 and the second positioning hole 21 coincide. The pressing assembly 3 includes a pressing member 31, a stop block 32 and a ball bearing 33. The pressing member 31 is provided with a card 5 and a guide protrusion 6. One end of the pressing member 31 passes through the through hole 11 and extends into the slide groove 12 and is detachably connected to the stop block 32. Specifically, the end of the pressing member 31 passes through the stop block 32 and is engaged with the card 5. The card 5 is located on the side of the stop block 32 away from the ball bearing 33 and abuts against the stop block 32. The card 5 cooperates with the pressing member 31 to clamp and limit the stop block 32. The stop block 32 is entirely or partially located within the slide groove 12, and its outer wall is in sliding contact with the inner wall of the slide groove 12. The ball bearing 33 and the first positioning hole 13 are both located between the stop block 32 and the bottom of the slide groove 12. When the crank body 1 and the central shaft 2 are locked, the stop block 32 pushes the ball bearing 33 to simultaneously insert into the first positioning hole 13 and the second positioning hole 21. Specifically, the side wall where the stop block 32 and the ball bearing 33 abut is an arc surface. The ball bearing 33 moves gradually towards the first positioning hole 13 and the second positioning hole 21 along the arc surface of the stop block 32 until the ball bearing 33 is simultaneously inserted into the first positioning hole 13 and the second positioning hole 21. At this time, the part of the ball bearing 33 located within the slide groove 12 simultaneously abuts against the outer wall of the stop block 32.

[0043] refer to Figure 3 and Figure 4 Multiple balls 33 are provided, with adjacent balls 33 spaced apart circumferentially along the stop block 32. In this embodiment, two balls 33 are provided. This increases the contact points and force uniformity when the crank body 1 and the central shaft 2 are locked, thereby improving the stability and firmness of the connection.

[0044] refer to Figure 3 , Figure 4 and Figure 6 The snap-fit ​​component 6 is fixed to the end of the pressing component 31 away from the stop block 32. The snap-fit ​​component 6 and the limiting groove 15 have non-circular cross-sections (such as elliptical, floral, etc.). The circumferential sidewall of the snap-fit ​​component 6 or the end of the pressing component 31 away from the stop block 32 slides against the inner wall of the limiting groove 15, and the sliding direction is in the same direction as the sliding direction of the pressing component 31. This restricts the rotation of the pressing component 31 and ensures that the pressing component 31 can only slide in a predetermined direction, improving the stability and accuracy of the pressing operation. At the same time, a spring 7 is provided on the pressing component 31. The spring 7 is used to push the pressing component 31 to slide away from the central axis 2. After the pressing operation, the pressing component 31 automatically resets and maintains a stable locked state of the pressing component 3 in the non-pressing state. The inner wall of the limiting groove 15 can also be fixed with a guide protrusion 61. Correspondingly, the snap-fit ​​component 6 is provided with a groove that matches the guide protrusion 61, thereby enhancing the guiding and limiting effect.

[0045] refer to Figure 3 and Figure 4 The fixing member 4 is threadedly connected to the end face of the pressing member 31 away from the stop block 32. When the fixing member 4 is tightened, it abuts against the outer wall of the crank body 1. The distance between the fixing member 4 and the outer wall of the crank body 1 is the sliding distance of the pressing member 31 in the through hole 11. By loosening or tightening the fixing member 4, the sliding space of the pressing member 31 can be controlled, thereby achieving precise control of the locking and disengaging operation of the crank body 1 and the bottom bracket 2. In addition, since the crank body 1 has a concealed groove 14, when the fixing member 4 is tightened, the part of the fixing member 4 outside the pressing member 31 is located in the concealed groove 14, so that the fixing member 4 does not protrude additionally from the surface of the crank body 1. This protects the fixing member 4 from accidental contact or damage by external forces and makes the overall appearance of the crank more concise and smooth.

[0046] For bicycles with smaller tires, such as those with a diameter of 12 inches, the cranks can be removed to turn them into balance bikes, thus increasing their versatility.

[0047] The implementation principle of the quick-release crank with safe and controllable function in this application embodiment is as follows: When it is necessary to install the crank, insert one end of the crank body 1 into the bottom shaft 2, so that the first positioning hole 13 is aligned with the second positioning hole 21. At this time, the spring 7 pushes the pressing member 31 to slide away from the bottom shaft 2, which drives the stop block 32 to move. The stop block 32 pushes the ball 33 to simultaneously insert into the first positioning hole 13 and the second positioning hole 21, thereby locking the crank body 1 and the bottom shaft 2. Then, tighten the fixing member 4 so that it abuts against the outer wall of the crank body 1, restricting the sliding of the pressing member 31 and ensuring the stability of the locked state. When the crank needs to be disassembled, first loosen the fixing part 4 to leave space for the sliding of the pressing part 31, then press the pressing part 31. The pressing part 31 slides towards the central shaft 2, which drives the stop block 32 to move, making the space between the stop block 32 and the bottom of the groove 12 larger. At this time, the crank body 1 can be separated from the central shaft 2 by pulling it outward. The ball bearing 33 is then forced to slide out from the first positioning hole 13 and the second positioning hole 21.

[0048] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A quick-release crank with a safe and controllable function, comprising a crank body (1) and a bottom bracket (2), wherein one end of the crank body (1) is inserted into the bottom bracket (2), and the other end is used to connect to the pedal, characterized in that: The crank body (1) is provided with a pressing component (3) and a fixing component (4). The pressing component (3) is slidably disposed on the crank body (1) and is slidably disposed in the direction close to or away from the central shaft (2). The pressing component (3) is used to lock or separate the crank body (1) from the central shaft (2). The fixing component (4) is located on the side of the crank body (1) away from the central shaft (2) and is used to lock or release the function of the pressing component (3).

2. The quick-release crank with safety and controllable function according to claim 1, characterized in that: The crank body (1) is provided with a through hole (11), a slide groove (12) and a first positioning hole (13). The slide groove (12) is located at the end face of the crank body (1) that extends into the central shaft (2). The through hole (11) passes through the crank body (1) and connects to the slide groove (12). The first positioning hole (13) is located on the groove wall of the slide groove (12). The central shaft (2) is provided with a second positioning hole (21). When one end of the crank body (1) is inserted into the central shaft (2), the first positioning hole (13) and the second positioning hole (21) coincide. The pressing assembly (3) includes a pressing element (31), a stop (32) and a ball (33). The pressing element (31) 1) One end passes through the through hole (11) and extends into the slide groove (12) and is detachably connected to the stop block (32). The stop block (32) is entirely or partially located in the slide groove (12) and the outer wall of the stop block (32) slides against the inner wall of the slide groove (12). The ball (33) and the first positioning hole (13) are both located between the stop block (32) and the bottom of the slide groove (12). When the crank body (1) and the central shaft (2) are locked, the stop block (32) pushes the ball (33) to be inserted into the first positioning hole (13) and the second positioning hole (21) at the same time. The part of the ball (33) located in the slide groove (12) simultaneously abuts against the outer wall of the stop block (32). When the stop block (32) is located inside the slide groove (12), the vertical cross section of the stop block (32) located outside the slide groove (12) is the same as the vertical cross section of the part of the crank body (1) that extends into the central shaft (2).

3. The quick-release crank with safety and controllable function according to claim 2, characterized in that: The pressing member (31) has a card (5) embedded in it. The card (5) is located on the side of the stop block (32) away from the ball (33) and abuts against the stop block (32).

4. The quick-release crank with safety and controllable function according to claim 2, characterized in that: The fixing member (4) is threadedly connected to the end face of the pressing member (31) away from the stop (32). When the fixing member (4) is tightened, the fixing member (4) abuts against the outer wall of the crank body (1). When the fixing member (4) is loosened, the distance between the fixing member (4) and the outer wall of the crank body (1) is the sliding distance of the pressing member (31) in the through hole (11).

5. The quick-release crank with safety and controllable function according to claim 4, characterized in that: The crank body (1) has a concealed groove (14). When the fixing member (4) is tightened, the part of the fixing member (4) outside the pressing member (31) is located in the concealed groove (14).

6. The quick-release crank with safety and controllable function according to claim 2, characterized in that: The crank body (1) has a limiting groove (15) provided. The center lines of the limiting groove (15) and the through hole (11) are collinear, and the inner diameter of the limiting groove (15) is larger than the inner diameter of the through hole (11). The vertical cross section of the limiting groove (15) is circular or non-circular and closely matches the shape of the end face of the pressing member (31) away from the stop (32). A snap-fit ​​member (6) is fixed at the end of the pressing member (31) away from the stop (32). The cross section of the snap-fit ​​member (6) is non-circular. The circumferential side wall of the snap-fit ​​member (6) slides against the inner wall of the limiting groove (15) and the sliding direction is in line with the sliding direction of the pressing member (31).

7. The quick-release crank with safety and controllable function according to claim 2, characterized in that: The first positioning hole (13) and the second positioning hole (21) and the ball (33) are each provided with at least one, and the adjacent balls (33) are evenly or unevenly distributed along the circumferential distance of the stop block (32).

8. The quick-release crank with safety and controllable function according to claim 2, characterized in that: The pressing member (31) is provided with a spring (7) on its ring. The two ends of the spring (7) abut against the bottom of the limiting groove (15) and the end face of the pressing member (31) facing the stop block (32), respectively, to push the pressing member (31) to slide away from the central axis (2).

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