JPS5811148U - Braking gap automatic adjustment device for mechanical drum brakes - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and Figure 1 is a front view;
Figure 2 is a rear view, Figure 3 is a sectional view taken along ■-■ of Figure 2, and Figure 4 is a rear view.
The figure is a plan view, and FIG. 5 is an exploded perspective view of the cam member, cam collar, washer, actuating member, adjustment gear, adjustment lever, and feed pawl. 2.2' is a brake shoe, 2b, 2b' is a shoe web free end, 5 is a cam member, 5a is a cam part, 9.9'
10 is a cam collar groove, 10 is an operating member insertion hole, 10a is a small diameter part, 10b is a first step part of a stopper, 11 is an operating member, 11a
is a straight shaft part, llb is a small diameter shaft part, 11C is a head part,
14 is an adjustment gear. - Amendment October 1982. 5. The scope of claims for utility model registration shall be amended as follows. O Scope of utility model registration claim. The cam collar, which the free end of the shoe web comes into contact with, is slidably fitted in the cam shaft direction to the cam part of the cam member that expands the brake shoes when the brake arm rotates, and the adjustment bolt screwed into the cam member is fitted. In a mechanical drum brake in which the cam collar moves in the cam shaft direction and in the shoe expansion direction by screwing to expand the brake shoes and adjust the braking gap, a part of the adjustment bolt insertion hole of the cam member. A female thread is screwed into the small diameter portion formed in the adjustment bolt, and the end of the small diameter portion is used as a single step stopper portion, while a male thread that is screwed into the female thread is screwed into the small diameter shaft portion continuous with the straight shaft portion of the adjustment bolt, Braking gap automatic adjustment of a mechanical drum brake characterized in that the straight shaft portion of the adjustment bolt is brought into contact with the first stage portion of the stopper to restrict the screw movement of the adjustment bolt, and the length of this screw engagement is the adjustment amount. Device. The brief description of the drawing has been amended as follows. "Operating member..." on page 17, lines 2-3 of the specification
...Change the feed claw to the adjustment bolt, adjustment gear,
"stopper lever and adjustment lever". "Operating member insertion hole" on page 17, line 7 of the specification is corrected to "adjustment bolt insertion hole".

Claims (1)

[Scope of utility model registration request] A cam collar, which the free end of the shoe web comes into contact with, is slidably fitted in the cam shaft direction to the cam portion of the cam member that expands the brake shoes when the brake arm rotates, and the actuating member screwed onto the cam member is fitted. In a mechanical drum brake in which the cam collar moves in the cam shaft direction and in the shoe expansion direction by screwing to expand the brake shoes and adjust the braking gap, a part of the operating member insertion hole of the cam member. A female thread is screwed into the small diameter portion formed in the holder, and the end of the small diameter portion serves as a single step part of the stopper, while a male thread that is screwed into the acid thread is screwed into the small diameter shaft portion continuous with the straight shaft portion of the actuating member. A braking gap for a mechanical drum brake, characterized in that the straight shaft portion of the actuating member is brought into contact with the stepped portion of the stopper to restrict the screw movement of the actuating member, and the length of this screw engagement is an adjustment amount. Automatic adjustment device.