Bicycle crank dismounting tool

Abstract

The utility model discloses a bicycle crank dismounting tool which comprises an ejector rod, one end of the ejector rod is in threaded connection with a crank fixing sleeve, a square hole top cap and a spline top cap are respectively sleeved with the ejector rod in a replaceable mode, a main body part of the ejector rod is provided with trapezoidal threads, the right end face of the ejector rod is provided with a square hole, and the side face of the square hole is provided with a through hole. An outer hexagon A is arranged between the trapezoidal thread and the through hole, a jacking column is arranged at the left end of the jacking rod, and an inner hole A used for containing a rolling steel ball is formed in the jacking column; the top cap and the ejector rod are arranged in a split mode, the rolling steel balls are used for rolling connection between the top cap and the ejector rod, abrasion of the center shaft center or the ejector rod caused by direct contact friction between the center shaft center and the ejector rod when the crank is disassembled can be prevented, friction force during disassembly can be reduced, and disassembly is easier. The crank disassembling tool has two using functions, has various disassembling modes, and can effectively prevent the center shaft from being damaged during disassembling.

Description

Technical Field

[0001] This utility model relates to a disassembly tool, and more particularly to a bicycle crank disassembly tool. Background Technology

[0002] Square-bore and spline bottom brackets are two common types of bottom brackets for bicycles. These two bottom brackets have similar structures, and their paired cranks are installed and removed in a similar way. The mounting holes of both types of cranks are tapered, and they are fixed to the bottom bracket axle by pressing and tightening with bottom bracket screws. As a result, it is difficult to remove the cranks with conventional tools, and special tools are required for removal.

[0003] The existing solution uses fine threads on the push rod, which are prone to stripping, resulting in poor performance and short service life. It requires the use of hand tools such as open-end wrenches and Allen wrenches, leading to low disassembly efficiency and even problems with complete removal. The push rod head is integrated with the push rod itself, causing direct friction between the push rod head and the central shaft, increasing friction and making disassembly more difficult. Furthermore, friction can easily damage the central shaft or disassembly tools. The disassembly method is also relatively simple and inflexible. Utility Model Content

[0004] This utility model provides a bicycle crank removal tool to overcome the shortcomings of existing removal tools, such as low removal efficiency, limited removal methods, and short service life.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] This utility model discloses a bicycle crank disassembly tool, including a push rod. One end of the push rod is threadedly connected to the crank fixing sleeve. A square hole cap and a spline cap are interchangeably fitted onto the push rod. The main body of the push rod is provided with trapezoidal threads, and a square hole is provided on its right end face. A through hole is provided on the side of the square hole. An external hexagonal A is provided between the trapezoidal threads and the through hole. A push post is provided on the left end of the push rod.

[0007] Furthermore, the outer circle of the top post is provided with a groove A for placing the anti-drop rubber ring, and the top post is provided with an inner hole A for placing the rolling steel ball.

[0008] Furthermore, a small arc-shaped recess A is provided at the bottom of the inner hole A, which fits against the spherical surface of the rolling steel ball.

[0009] Furthermore, the crank retaining sleeve has a through trapezoidal internal thread that engages with the trapezoidal thread on the push rod. One end of the internal thread has an external hexagonal B for easy gripping with a wrench, and the other end has an external thread that engages with the disassembly thread on the bicycle crank. The front end of the trapezoidal internal thread has a countersunk hole for preventing the spline cap from being punctured.

[0010] Furthermore, the square-hole cap has an inner hole B for fitting onto the top post. The inner hole B has a groove B, which is in the same position as the anti-drop rubber ring, so that the square-hole cap and the anti-drop rubber ring are not exposed to each other, thus avoiding friction and generating frictional force. It also allows the anti-drop rubber ring to hold the square-hole cap in place, preventing it from falling off. The bottom of the inner hole B has a small arc-shaped recess B, which fits against the spherical surface of the rolling steel ball.

[0011] Furthermore, the spline cap has an inner hole C for fitting onto the top post; a groove C is provided on the inner hole C, which is in the same position as the anti-detachment rubber ring, so that the spline cap and the anti-detachment rubber ring are not exposed to each other, avoiding friction and generating frictional force. It can also make the anti-detachment rubber ring lock the spline cap so that it will not easily fall off. A small arc-shaped pit C is provided at the bottom of the inner hole C, which fits against the spherical surface of the rolling steel ball; and a thickened cylinder is provided at the top.

[0012] The beneficial effects achieved by this utility model are as follows: the connection between the push rod and the crank fixing sleeve is a trapezoidal thread, which improves the connection strength, has good smoothness, and avoids thread stripping and thread jamming. The top cap and the push rod are set as separate parts, with rolling steel balls in the middle as rolling connections. This can prevent the bottom shaft axis from directly contacting and rubbing against the push rod when disassembling the crank, which would cause wear on the bottom shaft axis or the push rod. It can reduce the friction during disassembly, making disassembly easier. The square hole top cap and spline top cap are interchangeable, realizing two functions of one tool. This crank disassembly tool has multiple disassembly methods and can effectively prevent damage to the bottom shaft during disassembly. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

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

[0015] Figure 2 This is an exploded view of the present invention;

[0016] Figure 3 This is a cross-sectional schematic diagram of the present invention;

[0017] Figure 4 This is a disassembly diagram of the present invention. Figure 1 ;

[0018] Figure 5 This is a disassembly diagram of the present invention. Figure 2 ;

[0019] Figure 6 This is a disassembly diagram of the present invention. Figure 3 ;

[0020] Figure 7 This is a disassembly diagram of the present invention. Figure 4 .

[0021] In the diagram: 1.1, Top rod; 1.1.1, Square hole; 1.1.2, Through hole; 1.1.3, Trapezoidal thread; 1.1.4, External hexagon A; 1.1.5, Top post; 1.1.6, Groove A; 1.1.7, Inner hole A; 1.1.8, Small arc recess A; 1.2, Crank retaining sleeve; 1.2.1, External thread; 1.2.2, Trapezoidal internal thread; 1.2.3 1.2.4 External hexagonal head; 1.3 Countersunk hole; 1.4 Square hole cap; 1.3.1 Inner hole B; 1.3.2 Groove B; 1.3.3 Small arc recess B; 1.4 Spline cap; 1.4.1 Inner hole C; 1.4.2 Groove C; 1.4.3 Small arc recess C; 1.4.4 Thickened cylinder; 1.5 Anti-detachment rubber ring; 1.6 Rolling steel ball. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] Example 1

[0024] like Figure 1-3 As shown, a bicycle crank removal tool includes a push rod 1.1, one end of which is threadedly connected to a crank fixing sleeve 1.2. A square hole cap 1.3 and a spline cap 1.4 are interchangeably sleeved on the push rod 1.1.

[0025] A square hole 1.1.1 is provided on the right end face of the push rod 1.1, and a through hole 1.1.2 is provided on the side of the square hole 1.1.1. The middle section of the push rod 1.1 is provided with an external hexagon A1.1.4, the main body is provided with a trapezoidal thread 1.1.3, and a push post 1.1.5 is provided on the left end. A groove A1.1.6 is provided on the outer circle of the push post 1.1.5 for setting the anti-drop rubber ring 1.5. An inner hole A1.1.7 is provided on the push post 1.1.5 for setting the rolling steel ball 1.6. A small arc-shaped recess A1.1.8 is provided at the bottom of the inner hole A1.1.7, which fits with the spherical surface of the rolling steel ball 1.6.

[0026] The crank retaining sleeve 1.2 has a through trapezoidal internal thread 1.2.2, which mates with the trapezoidal thread 1.1.3 on the push rod 1.1.1; one end of the crank retaining sleeve 1.2 has an external hexagon B 1.2.3 for easy wrench gripping; the other end has an external thread 1.2.1, which mates with the disassembly thread on the bicycle crank; the front end of the trapezoidal internal thread 1.2.2 has a countersunk hole 1.2.4 to prevent the spline cap 1.4 from being inserted.

[0027] The square hole cap 1.3 has an inner hole B1.3.1 and is fitted onto the top post 1.1.5. The inner hole B1.3.1 has a groove B1.3.2, which is in the same position as the anti-drop rubber ring 1.5. When the product is in use, the square hole cap 1.3 and the anti-drop rubber ring 1.5 are just separated to avoid friction. When not in use, the anti-drop rubber ring 1.5 can also hold the square hole cap 1.3 in place so that it will not fall off easily. The bottom of the inner hole B1.3.1 has a small arc-shaped recess B1.3.3, which fits against the spherical surface of the rolling steel ball 1.6.

[0028] The spline cap 1.4 has an inner hole C1.4.1, which is fitted onto the top post 1.1.5. The inner hole C1.4.1 has a groove C1.4.2, which is in the same position as the anti-drop rubber ring 1.5, so that when the product is in use, the spline cap 1.4 and the anti-drop rubber ring 1.5 are just separated, avoiding friction. When not in use, the anti-drop rubber ring 1.5 can also hold the spline cap 1.4 in place so that it will not fall off easily. The bottom of the inner hole C1.4.1 has a small arc-shaped recess C1.4.3, which fits against the spherical surface of the rolling steel ball 1.6. The top is a thickened cylinder 1.4.4.

[0029] Disassembly process: such as Figure 4-7 As shown, when disassembling the square-hole crank, screw the external thread 1.2.1 of the crank retaining sleeve 1.2 onto the crank disassembly thread. For threads that are tight, an adjustable wrench or an open-end wrench can be used to tighten it onto the external hexagon B1.2.3. Then, disassembly can be completed in the following way:

[0030] Method 1: Use an adjustable wrench or open-end wrench to place on the outer hexagon A1.1.4 of the push rod 1.1, and rotate the push rod 1.1 to remove it.

[0031] Method 2: Insert the square connector of the electric impact wrench into the square hole 1.1.1 of the top rod 1.1, start the electric impact wrench, and you can quickly remove it.

[0032] Method 3: Insert the square connector of the ratchet wrench into the square hole 1.1.1 of the push rod 1.1. The ball bearing of the square connector will be engaged in the through hole 1.1.2 of the push rod 1.1 to prevent loosening. Rotate the push rod 1.1 to remove it.

[0033] Method 4: Insert the long rod into the through hole 1.1.2 of the push rod 1.1, and rotate the push rod 1.1 to disassemble.

[0034] When the splined crank needs to be disassembled, remove the square hole cap 1.3 and replace it with the spline cap 1.4. The remaining disassembly steps are the same as when disassembling the square hole crank.

[0035] It should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The terminology used in the description of this application is only for describing specific embodiments and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings indicate similar items, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0036] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0037] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

Claims

1. A bicycle crank removal tool, characterized in that, Includes a push rod, one end of which is threadedly connected to a crank fixing sleeve, and a square hole cap and a spline cap are interchangeably sleeved on the push rod respectively; The main body of the push rod is provided with trapezoidal threads, and a square hole is provided on its right end face. A through hole is provided on the side of the square hole. An external hexagon A is provided between the trapezoidal threads and the through hole. A top post is provided at the left end of the push rod. The top post has an inner hole A for placing rolling steel balls.

2. A bicycle crank puller according to claim 1, wherein, The outer circumference of the top column is provided with a groove A to facilitate the placement of the anti-detachment rubber ring.

3. A bicycle crank puller according to claim 2, wherein, The bottom of the inner hole A is provided with a small arc-shaped recess A, which fits against the spherical surface of the rolling steel ball.

4. The bicycle crank disassembly tool of claim 1, wherein, The crank retaining sleeve has a through trapezoidal internal thread that mates with the trapezoidal thread on the push rod. One end of the internal thread has an external hexagonal B for easy gripping with a wrench, and the other end has an external thread that mates with the disassembly thread on the bicycle crank. The front end of the trapezoidal internal thread has a countersunk hole for preventing the spline cap from being punctured.

5. The bicycle crank disassembly tool of claim 1, wherein, The square-hole top cap has an inner hole B for fitting onto the top column. A groove B is provided on the inner hole B, which is in the same position as the anti-drop rubber ring, so that the square-hole top cap and the anti-drop rubber ring are not exposed to each other, thus avoiding friction and generating frictional force. It can also make the anti-drop rubber ring lock the square-hole top cap to prevent it from falling off. A small arc-shaped pit B is provided at the bottom of the inner hole B, which fits against the spherical surface of the rolling steel ball.

6. The bicycle crank disassembly tool of claim 1, wherein, The spline cap has an inner hole C for fitting onto the top post. A groove C is provided on the inner hole C, which is in the same position as the anti-drop rubber ring, so that the spline cap and the anti-drop rubber ring are not exposed to each other, avoiding friction and generating frictional force. It also allows the anti-drop rubber ring to hold the spline cap in place, so that it will not easily fall off. A small arc-shaped pit C is provided at the bottom of the inner hole C, which fits against the spherical surface of the rolling steel ball. A thickened cylinder is provided at the top.

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