JPH0144312Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tool for disassembling a sprocket screwed into a freewheel body of a multi-stage freewheel of an automobile, so-called multi-freewheel.

Conventionally, when replacing the sprocket of a multi-free wheel assembled on a bicycle rear wheel hub, the threaded part of the outer sprocket 12 screwed and fixed to the multi-free wheel main body 11 is loosened and disassembled. The multi-free wheel is configured to rotate freely in one direction, but since it rotates freely in the loosening direction, unless a special sprocket vise is used, the base chain 5 Two sets of levers 1, each equipped with a lever and a bind chain 6, are wound around separate sprockets and rotated in opposite directions to loosen the screwed sprockets. For this reason, two identical disassembly tools are required, and each disassembly tool is hung one by one on the multi-free foil, making it difficult to work.In addition, since one disassembly tool is hung on the multi-free foil one at a time, it is unstable and easily slips off when force is applied, which can be dangerous. A problem arose.

The present invention is proposed to solve these problems, and an embodiment of the present invention will be shown below according to the drawings. It consists of a lever 2 having a string-like bind chain 6 with an open end and a lever 3 having only a string-like bind chain 6 with one end fixed and the other end open. The gist is that the opposing ends of both levers are engaged so as to serve as a fulcrum to support the reaction force of the lever 3, which does not have a base chain 5, when the lever is moved.

One lever 2 is provided with a base chain 5 and a bind chain 6 like the conventional lever 1, but
Only a bind chain 6 is provided on the other lever 3, and the pair of levers 2 and 3 are engaged with each other via a rotation shaft 9. This engagement point functions as a fulcrum that receives the reaction force of the lever 3 without the base chain 5. In this way, the present invention provides a multi-free foil disassembly tool with a simple structure, high workability, and high safety by engaging the lever 2 with the base chain 5 and the lever 3 without the base chain 5. is intended to provide.

As shown in FIG. 3, link plates 7 at both ends of a roller chain with a length of two and a half pieces are fixed to the lever 2 using pins 8 to form a base chain 5.
Further, a link plate 7 at one end of a roller chain having a length of 5 to 6 pieces is fixed to the lever 2 main body using a pin 8, and the other end of this roller chain is an open end and is used as a bind chain 6 to constitute one lever 2. . A link plate 7 at one end of a roller chain having a length of 7 to 8 pieces is fixed to the lever 3 main body using a pin 8, and the other end of this roller chain is set as an open end as a bind chain 6 to constitute the lever 3.

Here, a rotation shaft 9 is provided through the levers 2 and 3, and the levers 2 and 3 are pivotally supported around the rotation shaft 9 so as to be rotatable in mutually opposite directions.

How to use this bicycle multi-freewheel disassembly tool is as shown in FIG.
(either one of
Then, the bind chain 6 is wound and held around the outermost sprocket 12 screwed and fixed to the male thread 19 of the multi-free foil main body 11, and the levers 2 and 3 are rotated in opposite directions (directions of arrows). The bind chain 6 of the lever 3 prevents the rotation of the multi-free wheel body 11 because the inner peripheral protrusion 17 of the sprocket and the groove 20 of the multi-free wheel body 11 are fitted, and as a result, the base of the lever 2 Chain 5, and bind chain 6
It becomes possible to loosen the screwing of the sprocket 12 wound and held onto the multi-freewheel main body 11.

In addition, FIG. 5 shows another embodiment of the present invention, in which a pair of levers 4 and 18 have the same outer shape, and sprockets (14, 1
5 or 16), and wrap the base chain 5 and bind chain 6 of the lever 2 around the outermost sprocket 12, which is screwed and fixed to the male thread 19 of the multi-free foil main body 11, and hold the lever 2. , 3 in opposite directions (in the direction of the arrows), the bind chain 6 of the lever 3 is such that the inner peripheral protrusion 17 of the sprocket and the groove 20 of the multi-freewheel body 11 are fitted. Therefore, the rotation of the multi-free foil main body 11 is prevented,
As a result, it becomes possible to loosen the screwing of the sprocket 12 wound and held by the base chain 5 of the lever 2 and the bind chain 6 to the multi-freewheel main body 11.

FIG. 5 shows another embodiment of the present invention, in which a pair of levers 4 and 18 have the same external shape, and hooks 10 and 13 are formed at their ends, and these hooks engage with each other. The engagement point is made a fulcrum that receives the reaction force of the lever 18 which does not have the base chain 5.

Since the present invention is structured as described above,
It can be disassembled with one tool, and this tool can be folded to make it more compact.

In addition, there is no need to hang separate tools on the multi-free foil, which greatly improves work efficiency and safety.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional multi-free foil disassembly tool. FIG. 2 is a front view showing a conventional multi-free foil disassembly method. FIG. 3 is a front view of an embodiment according to the present invention. FIG. 4 is a front view showing the disassembly method. FIG. 5 is a front view of another embodiment. FIG. 6 is an enlarged sectional view showing the joint between the lever and the roller chain. FIG. 7 is an exploded perspective view of the multi-free foil. In the figure, 1: Lever, 2: Lever, 3: Lever,
4: Lever, 5: Base chain, 6: Bind chain, 7: Link plate, 8: Pin, 9: Rotation shaft, 10: Hook, 11: Multi-free wheel body, 12: Sprocket, 13: Hook, 14:
Sprocket, 15: Sprocket, 16: Sprocket, 17: Protrusion, 18: Lever, 19: Male thread, 20: Groove.

Claims (1)

[Claims for Utility Model Registration] (1) A lever having a U-shaped base chain with both ends fixed and a string-like bind chain with one end fixed and the other end open; and a lever with only a string-like bind chain with an open end, and the levers are opposite each other so as to serve as a fulcrum to support the reaction force of the lever without a base chain when rotating both in opposite directions. A bicycle multi-freewheel disassembly tool characterized by engaging the vicinity of the end. (2) The multi-free wheel for a bicycle according to claim 1 of the utility model registration claim, characterized in that the opposite ends of both levers are engaged so as to be rotatable about a rotation shaft as a fulcrum. Disassembly tools. (3) The bicycle multi-freewheel disassembly tool according to claim 1, which is characterized in that both levers are formed into hooks near their opposing ends and rotatably engaged with each other.