JP4283154B2 - Brake return spring removal tool - Google Patents

Description

  The present invention relates to an improvement in a tool for attaching / detaching a brake return spring of a vehicle.

  A detaching tool as shown in FIG. 6 has been used for detaching the conventional brake return spring. In this detachable tool, one end of the spring hook is hooked on the brake shoe pin first, and one hook 3 of the brake return spring 1 is sandwiched in the through hole 53 formed in the first claw portion 54 and fixed with the bolt 51. The hook 3 is attached to and detached from the pin of the brake shoe by placing the flat second claw 52 against the back surface of the brake shoe and pushing the first and second claw portions 54 and 52 together.

In addition, there exists a thing described in patent document 1, for example in the removal tool of a brake return spring.
Japanese Utility Model Publication No. 4-60674

  However, the brake return spring 1 is mounted in a narrow place, and with this detachable tool, it takes a lot of labor to insert the hook 3 into the through hole 53, and the work efficiency is poor. In addition, since the hook 3 passed through the through hole 53 of the first claw portion 51 is used as an action point, there is a case where force cannot be sufficiently transmitted to the second claw portion 52 due to distortion of the action point due to insufficient strength. Furthermore, since the second claw portion 52 only touches the rear surface of the brake shoe, the second claw portion 52 comes off and jumps vigorously by the spring force of the brake return spring 1, which is dangerous. In recent car models, the distance between the hook position and the rear surface of the brake shoe has been reduced, and there has been a problem that conventional attachment / detachment tools cannot be used.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a brake return spring detaching tool that can easily and safely remove a brake return spring.

  To achieve the above object, according to a first aspect of the present invention, there is provided a detachment tool for a brake return spring that is attached by hooking a hook to each bobbin-shaped pin formed on a pair of brake shoes of a vehicle. The first claw portion is formed into a bowl shape having a second claw portion, the first claw portion is provided with a hole that fits the end of the hook that is locked to one hook, and the second claw portion is provided with the other A bent portion for hanging on the head of the pin is formed, and a groove that fits the side surface of the pin is provided at the tip of the second claw portion.

  According to the first aspect of the present invention, the second claw portion is made of a solid brake shoe by hooking the bent portion of the second claw portion on the head of the pin and fitting the groove of the second claw portion with the side surface of the pin. It can be fixed to the pin, and a sufficient force can be transmitted to the first claw portion using that as an action point. Further, it is possible to save the trouble of passing the hook through the through hole as in the prior art, and to improve the work efficiency. Further, by fitting the hook into the hole of the first claw portion, it is possible to prevent the hook from coming off from the first claw portion, and to safely attach and detach the brake return spring.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIGS. 1A and 1B are views showing a mounting portion of a brake return spring that is detached using the detaching tool of the present invention, wherein FIG. 1A is a front view and FIG. 1B is a lower view.

  The brake return spring 1 is hung between the tips of a pair of brake shoes 10 facing each other. Semi-circular hooks 3 having a circular cross section are formed at both ends of the brake return spring 1. Each brake shoe 10 is provided with a bobbin-like pin 2 having a head portion 2 a, and a semicircular hook 3 is hooked on the pin 2.

  When the brake is actuated, the brake shoe 10 is opened outwardly against the spring force of the brake return spring 1 by an actuator (not shown) around the support point 10a on the base end side, and comes into contact with a brake drum (not shown) to apply the braking force. Is generated. When the brake is not operated, the brake shoes 10 are attracted to each other by the spring force of the brake return spring 1, and the contact with the brake drum is released.

  FIG. 2 is a view showing a removal tool 4 for the brake return spring 1 of the present invention.

  In FIG. 2, the removal tool 4 has a hook shape, and opens and closes the first and second claw portions 6 and 7 around the fulcrum portion 20 by opening and closing the handle 21.

  The first claw portion 6 is formed with a hook insertion hole 5 that fits with the end portion 3a of the semicircle hook 3 toward the outside. The hook insertion hole 5 is formed to have a diameter slightly larger than the end face of the semicircular hook 3, but preferably, the diameter of the hook insertion hole 5 is 6.5 mm and the tool width is 9 mm. The thickness is 6.5 mm, the mouth clearance is 0.5 mm, and the depth is 3 mm.

  When the brake return spring 1 is attached / detached, the end 3a of the half-circle hook 3 is fitted into the hook insertion hole 5, thereby preventing the hook 3 from coming off and preventing the brake return spring 1 from jumping by the spring force. Work safety.

  As shown in FIG. 3B, the second claw portion 7 is formed in a bowl shape and forms a bent portion 7a for hanging on the head 2a of the pin 2 (FIG. 1). As shown in FIG. 3A, an arcuate groove 7 c for fitting with the body portion 2 b of the pin 2 is formed in the extending direction of the handle 21 at the distal end portion 7 b of the second claw portion 7. Preferably, the groove 7c is formed to have a tool width of 12 mm, a pin receiving diameter of 9 mm, and a groove insertion thickness of 5 mm.

  When the brake return spring 1 is attached or detached, the bent portion 7a of the second claw portion 7 is hung on the head portion 2a of the pin 2 and the groove 7c is fitted to the pin 2 so that the second claw portion 7 is firmly fixed to the brake shoe. It can be fixed to the 10 pins 2, and a sufficient force can be transmitted to the first claw portion 6 by using this as the action point. Further, it is possible to save the trouble of passing the hook through the through hole as in the prior art, and to improve the work efficiency.

  Next, a method for removing the brake return spring 1 using the removal tool 4 will be described.

  First, as shown in FIG. 4, the second claw portion 7 is fixed to one pin 2. Specifically, the bent portion 7a of the second claw portion 7 is hung on the head portion 2a of the pin 2, and the end portion 7b is pushed in until the groove 7c is fitted to the body portion 2b.

  Next, as shown in FIG. 5, the first claw portion 6 is fixed to the semicircular hook 3 hung on the other pin 2. Specifically, the end 3 a of the semicircle hook 3 is fitted into the hook insertion hole 5 of the first claw portion 6.

  When the first claw portion 6 and the second claw portion 7 are fixed, the handle 21 is closed. Then, with the second claw portion 7 fixed to the pin 2 as an action point, the first claw portion 6 is pushed outward and the half-circle hook 3 is pushed outward from the pin 2 and detached from the pin 2. When one half-circle hook 3 is removed, the brake return spring 1 is released from restraint, and the other half-circle hook 3 is also easily detached.

  The brake return spring 1 is attached in the same manner as described above after first hooking one hook 3 on the pin 2.

  In addition, although the tension | tensile_strength of the brake return spring 1 is 549N-902N, this is removed with the force of 91-150N using this removal tool.

  As described above, in the present invention, in the detachment tool for the brake return spring 1 that is attached by hooking the hook 3 to the bobbin-shaped pin 2 formed on the brake shoe 10 of the vehicle, the detachment tool is the first claw portion. 6 and a second claw portion 7, a bent portion 7 a for hanging on the head 2 a of the pin 2 is formed on the second claw portion 7, and a pin is attached to the end portion 7 b of the second claw portion 7. 2 is provided so that when the brake return spring 1 is detached, the bent portion 7a of the second claw portion 7 is hung on the head 2a of the pin 2, and the groove 7c is fitted to the side surface of the pin 2. Thus, the second claw portion 7 can be fixed to the pin 2 of the solid brake shoe 10, and a sufficient force can be transmitted to the first claw portion 6 using the second claw portion 7 as an action point. Further, it is possible to save the trouble of passing the hook through the through hole as in the prior art, and to improve the work efficiency.

  Although the present invention has been described in certain terms with regard to structural and methodological features, the means disclosed herein include preferred forms of practicing the invention, and the invention is illustrated and described. It should be understood that the invention is not limited to specific features. Accordingly, the present invention includes any forms or modifications within the scope of the claims as appropriately interpreted in accordance with the principle of equality.

  The present invention can be applied to a tool for attaching / detaching a brake return spring of a vehicle.

It is a figure which shows the attaching part of a brake return spring. It is a figure which shows the removal tool of the brake return spring of this invention. It is a figure which shows the structure of a 2nd nail | claw part. It is a figure which shows the attachment method of a 2nd nail | claw part. It is a figure which shows a mode that the 1st nail | claw part was attached. It is a figure which shows the removal tool of the conventional brake return spring.

Explanation of symbols

1 Brake Return Spring 2 Pin 2a Pin Head 3 Hook 3a Hook End 5 Hook Insertion Hole 6 First Claw 7 Second Claw 7a Bent 7c Groove 10 Brake Shoe

Claims (1)

In a tool for attaching and detaching a brake return spring that is attached to each bobbin-shaped pin formed on a pair of brake shoes of a vehicle by hooking the hook.
The removal tool is formed in a bowl shape having a first claw portion and a second claw portion,
The first claw portion is provided with a hole that fits with an end portion of the hook that is locked to one hook,
Forming a bent portion for hanging on the head of the other pin in the second claw portion, and providing a groove to be fitted to the side surface of the pin at the tip portion of the second claw portion;
Brake return spring removal tool characterized by that.

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