JPS6029424Y2 - Pulley removal tool - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pulley removal tool used for removing the pulley from the shaft.

Conventionally used tools for removing pulleys grip the pulley by hooking at least two claws onto the outer diameter of the pulley, and then remove the shaft using a draw bolt provided on a claw mounting plate to which all the claws are pivotally attached. By pushing, the pulley gripped by the claws and the shaft are caused to move relative to each other, and the pulley is removed from the shaft.

Conventional pulley removal tools require a large amount of space as they hook onto the outer diameter of the pulley as described above.
It could not be used in narrow spaces.

In addition, large pulley removal tools have a large shape and are heavy. It is easy to handle.

), had the disadvantage that it could not be done by one person.

Therefore, even if there is a pulley removal tool available, it may not be possible to use it if the space is small or if the tool is large and only one person is working.
Unavoidably, they had to hit the pulley to remove it, which sometimes caused damage to the pulley.

This invention relates to a pulley removal tool that does not have the drawbacks mentioned above. By removing the pulley using a pre-prepared hole in the pulley, it is possible to remove the pulley even in a narrow space without damaging the pulley. The pulley can be removed reliably and easily without any problems, and the parts that make up the pulley removal tool are separated, and when the pulley is removed, the pulley removal tool can be assembled while being attached to the pulley. ,
Even when removing a large pulley, each part is light so one person can do the work.

Below, when explaining along the diagram, the first, second, third, and fourth
In the figure, 1 is a pulley attached to a shaft 2, and pulley 1 has holes 3, 3 for hooking the removal tool.
is provided.

Reference numeral 5 designates a mounting plate constituting the pulley removal tool of this invention.The mounting plate 5 is provided with two mounting holes 6 for attaching hooks 4, and each mounting hole 6 has a key groove. 7 is provided.

Claw positioning pins 8 provided on the hooks are inserted into these key grooves 7, respectively.

A female threaded hole 9 is formed in the mounting plate 5 at a position midway between the two mounting holes 6, and a draw bolt 10 is screwed into this female threaded hole 9.

The length from the axis of the female threaded hole 9 to the axis of the mounting hole 6 should be determined by the position of the hole 3 provided in the pulley, that is, the size of the pulley. Several mounting plates are prepared to accommodate pulleys of various sizes, and can be used as appropriate.

Next, to explain the hook 4, the hook 4 is provided with a recess 41 on the tip side, and the hook 4 is provided with a recess 41 at the tip.
2 is formed, and a hole 3 provided in the pulley is located in the recess 41 so that the pulley can be hooked by a claw portion 42.

A flange portion 43 is provided at the intermediate portion of the hook 4, and a threaded portion 44 is provided at the rear end of the hook 4.

The hook 4 is attached to the mounting plate 5 by a hook fixing nut 11 screwed into the flange portion 43 and threaded portion 44.

The hooks 12 and 13, which are fitted onto the tip side of the claw 4, are a temporary clamp collar and a presser spring, respectively. It is designed to hold the parts.

Next, the operation of this invention will be explained. First, the holding spring 13 and the temporary clamp collar 12 are inserted and set from the tip of the hook 4.

Next, insert the claws 4 into the holes 3, 3 of the pulley 1 to be removed, with the presser spring 13 and the temporary clamp collar 12 set, and use the claws 42 and the temporary clamp collar 12 to hold the spokes of the pulley. hold the parts together.

Next, hook the rear ends of the claws 4, 4 into the mounting holes 6, 6 of the mounting plate 5, which are selected to correspond to the size of the pulley 1, so that the key groove 7 and the claw positioning pin 8 are aligned with each other. the hooks 4 and 4 attached to the pulley 1.
Fix the mounting plate 5 to.

Next, remove the pulley 1 from the shaft 2 by turning the extraction bolt 10 and tightening it.

As described above, in the embodiment of this invention, the mounting plate 5 corresponding to the size of the pulley 1 is selected and used.However, in the embodiments of FIGS. 5 and 6, one mounting plate is used. This is a modification of the mounting plate that can accommodate pulleys of various sizes.

To explain each figure according to the drawings, in the center of the mounting plate 5 shown in FIG.
is carved, and a mounting elongated hole 14 is provided at a symmetrical position with the female threaded hole 9 as the center.

Since the hook 4 is inserted and fixed into the elongated mounting hole 14, it can be fixed at any position from the axis of the female threaded hole, and can be adapted to pulleys of various sizes.

In the case of the mounting plate 5 shown in FIG. 6, a pair of mounting holes 15 and 16° 17 are provided at symmetrical positions with respect to the female threaded hole 9, but at different positions from the female thread axis. .

In use, each pair of mounting holes 15, 16, and 17 may be selected depending on the size of the pulley, and the hooks may be fixed to the mounting holes.

As explained above with reference to the embodiments, in the pulley removal tool of this invention, the claws are hooked into the holes provided in the spokes of the pulley, so there is very little space on the outer periphery. Even when removing a pulley that is installed in a very narrow place where there is only one place, the pulley can be reliably removed without damaging the pulley.

In addition, when removing a large pulley, the pulley removal tool of this invention first temporarily fixes the hook on the pulley, then fixes the hook on the mounting plate, and so on. Since the tool is attached to the pulley while assembling the pulley removal tool, the work can be easily done by one person, unlike the conventional method of attaching a heavy pulley removal tool that has already been assembled to the pulley. There are advantages such as being able to

In addition, by using the pulley removal tool of this invention, it is possible to remove a large pulley installed in a narrow space where the shaft could not be removed even after spending 4 hours trying to remove it. , we have a track record of being able to remove it in 15 minutes.

[Brief explanation of the drawing]

Figure 1 is an assembled sectional view of this invention, Figure 2 is an assembly sketch of this invention, Figure 3 is an exploded sketch showing the assembled state of this invention, and Figure 4 is Figure 3. AA' cross-sectional view of 5th
This figure is a plan view of another embodiment of the mounting plate, and FIG. 6 is a plan view of another embodiment of the mounting plate. 4: Hook is a claw, 5: Mounting plate, 10: Pull-out bolt, 11:
Claw fixing nut, 12: Temporary clamp collar, 13: Pressing spring, 14: Mounting oblong hole, 15.16.17: Mounting hole.

Claims (1)

[Scope of utility model registration request] A mounting plate and a draw bolt screwed into the mounting plate so that they can move forward and backward,
The hook, which is removably attached at a symmetrical position with respect to the axis of the extraction bolt and parallel to the axis of the extraction bolt, is a pawl, and the hook is a pawl that protrudes in the radial direction provided at the tip of the pawl. Then, the hook is inserted into the pawl and is biased toward the tip of the pawl, and together with the pawl, a temporary clamp collar that clamps the spoke portion of the pulley, and the temporary clamp collar are urged toward the tip of the pawl. A pulley removal tool made of parts.