JPS628438Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a brake anchor pin for attaching a brake shoe to a brake bracket of a drum-type brake.

[Prior Art] Fig. 1 is a front view showing a state in which the drum of a leading-trailing type brake is removed, in which a brake shoe 3 is attached by an anchor pin 2 below a brake bracket 1 fixed to the axle side. It is mounted so that it can swing freely. A brake cylinder 4 is engaged with the upper end of this brake shoe 4, and when hydraulic pressure is sent to this brake cylinder 4 from the brake master cylinder side, a piston in the brake cylinder expands, and the brake shoe 3
is now expanding outward. Therefore, the lining 5 attached to the outside of the brake shoe 3
is pressed against the inner peripheral surface of the brake drum placed on the outside to generate braking force.

In this type of drum brake, a dust cover 6 is attached to prevent dirt and the like from entering from the back side. For this reason, the cross section of the attachment part of the anchor pin 2 is as shown in FIG. I'm getting used to it.

Therefore, in order to extract the anchor pin 2, it is necessary to remove the dust cover 6 and punch it out from the back side, which is a time-consuming process. In addition, there are some models in which a hole is made in the dust cover only in that part for punching, but there is a problem in that dust enters through the hole and the effectiveness of the cover is halved.

Therefore, conventional methods have been to form a flat part 2a on the head of the anchor pin 2 for applying a spanner, etc., as shown in FIG. 3A and B, or to drill a screw hole 2b as shown in FIG. There have also been proposals for grooves 2c as shown in Figure 5 A and B, but both require rotation and prying or pulling out during the pulling operation, and therefore force is applied only to one side. The workability of this pulling work was not good because it did not take much time.

Further, for example, Japanese Utility Model Application Publication No. 49-60436 discloses an anchor pin provided integrally with the brake shoe equipment panel and provided with one pin hole. However, with such known techniques, it is difficult to remove the anchor pin for repair, inspection, parts replacement, etc. of the brake.

[Purpose of the invention] Therefore, an object of the invention is to provide a brake anchor pin for a drum brake that is easy to install and remove, and that prevents mud from entering.

[Structure of the invention] According to the invention, in a brake anchor pin for attaching a brake shoe to a brake bracket of a drum type brake, one end of the anchor pin is provided with a chamfered portion, and the head of the other end is provided with an anchor. A plurality of holes are provided perpendicular to the axis of the pin.

[Operation and effect of the invention] Therefore, when pulling out the anchor pin, the screwdriver or tool is inserted into the hole where it is easiest to insert the screwdriver or tool, etc., and the anchor pin is rotated and pried. Just pull it out. Since a plurality of holes are provided, the rotation angle can be reduced. Furthermore, since the anchor pin has a chamfered portion during driving for installation, the work efficiency is improved. Also, if you check the chamfer and the hole, you can perform the correct driving operation.

As described above, according to the present invention, anchor pin removal and driving operations can be carried out efficiently, and inspection and maintenance can be carried out efficiently.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 6A and 6B and FIGS. 7A and 7B.

In the embodiment of the present invention shown in FIGS. 6A and 6B, two holes are provided in the head of the anchor pin 2 in orthogonal directions. These holes 11a, 1
1b may be provided on the same plane as shown in the figure, or may be provided offset in the axial direction as shown by reference numerals 12a and 12b in FIGS. 7A and 7B.

In any embodiment, the holes 11a, 11b, 12a,
A chamfered portion 13 is provided at the opposite end to which the portion 12b is provided.

[Summary] As described above, according to the present invention, one end of the anchor pin is provided with a chamfered portion, and the head of the other end is provided with a plurality of holes orthogonal to the axis of the anchor pin, so that removal and driving operations are simplified. This makes it easier to drive, and the driving work can be done more accurately.

[Brief explanation of the drawing]

Fig. 1 is a front view of a drum brake to which the present invention is applied, Fig. 2 is a side view of the anchor pin mounting part, Fig. 3 A and B, Fig. 4 A and B, and Fig. 5 A and B are respectively conventional In the explanatory drawings of the anchor pin, A is a side view, B is an end view, FIG. Figures A and B are explanatory diagrams of other embodiments, where A is a side view and B is an end view. 1... Brake bracket, 2... Anchor pin, 3... Brake shoe, 4... Brake cylinder, 11a, 11b, 12a, 12b... Anchor pin extraction hole.

Claims (1)

[Scope of utility model registration request] A brake anchor pin for attaching a brake shoe to a brake bracket of a drum type brake has a chamfered portion at one end of the anchor pin, and a plurality of holes perpendicular to the axis of the anchor pin in the head of the other end. A brake anchor pin for a drum brake that is characterized by being provided with.