# US 11,078,972 B2 · Heavy vehicle drum brake improvements

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,078,972 B2
- Document ID: US11078972B2
- Status: Granted
- Kind: B2
- Application number: 16/462,926
- Filed: 2017-11-15
- Published: 2019-10-10
- Granted: 2021-08-03
- Earliest claimed: 2016-11-22
- Applicants: Ken Pitt
- Inventors: Ken Pitt
- Web page: https://patentgrep.com/patent/US11078972B2

## CPC

- F16D 51/22: mechanically actuated
- F16D 65/08: for internally-engaging brakes
- F16D 65/09: Pivots or supporting members therefor
- F16D 65/22: adapted for pressing members apart {, e.g. for drum brakes}
- F16D 2121/14: Mechanical
- F16D 2125/28: Cams; Levers with cams
- F16D 2125/30: acting on two or more cam followers, e.g. S-cams
- F16D 2250/0076: Welding, brazing
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

The present disclosure relates to vehicle drum brakes. In one aspect, there is provided a brake shoe comprising a guide at or near its free end, which prevents brake shoe misalignment. According to a further aspect, there is provided a guide for attachment to a brake shoe at or near its free end, which prevents brake shoe misalignment. According to a further aspect, there is provided a drum brake assembly comprising a brake shoe comprising the guide.

## Claims

### Claim 1

A drum brake assembly, comprising:
a stationary carrier;
a brake shoe pivotally mounted to the stationary carrier and having a pair of spaced webs;
an actuating cam associated with the brake shoe;
a cam follower interposed between the webs and the actuating cam;
a rotatably mounted drum brake against which the brake shoe acts; and
the brake shoe further comprising a brake shoe guide extending lengthwise from an outboard web so as to make said outboard web longer than the other web, so that said outboard web extends in front of, and in sliding contact with, an outboard face of the actuating cam.

### Claim 2 (depends on 1)

The drum brake assembly of claim 1, further comprising a pair of the brake shoes, said pair of the brake shoes being pivotally mounted on the carrier so as to be oppositely directed and to act against the drum brake.

### Claim 3 (depends on 2)

The drum brake assembly of claim 2, wherein the brake shoes are mounted at one end thereof each upon fixed pivots, with further ends thereof carrying the cam followers and receiving the actuating cam between the respective cam followers, and wherein the further ends of the brake shoes are forced away from each other into contact with the drum brake by the actuating cam.

### Claim 4 (depends on 1)

The drum brake assembly of claim 1, wherein the actuating cam is an S-cam.

### Claim 5 (depends on 1)

The drum brake assembly of claim 1, wherein the cam follower is a roller.

### Claim 6 (depends on 1)

The drum brake assembly of claim 1, wherein the brake shoe guide is integrally formed with the outboard web of the brake shoe.

### Claim 7 (depends on 1)

The drum brake assembly of claim 1, wherein the brake shoe guide is retrofit to the outboard web of the brake shoe.