Drum brake with automatic adjustment
US4809826A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 11, 1988 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Jan 11, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D65/52
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The automatic adjustment of a drum brake is obtained by way of an adjusting lever (30) fitted to pivot on one (12) of the brake shoes when the wear of the friction linings (16) on the brake shoes (12) warrants it. This lever rests against a spacer (44) connecting the ends of the brake shoes between which the brake motor is located, such that the position of the lever (30) determines the distance apart in the rest position between these two ends when this motor is not actuated. Two surfaces opposite one another (48, 50) formed respectively on the spacer (44) and on the lever (30) define an operating clearance between them beyond which an adjustment is made when the brake is actuated. A lug (56) on a bimetal strip (52) takes up the space between the surface (48, 50) in order that an inadvertent adjustment does not occur due to an overheating of the brake drum when the temperature exceeds a certain threshold, thus increasing the operating clearance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.