Hydraulic brake actuator having spring-applied back-up brake with manual release means
US4361078A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1981 |
| Grant date | Nov 30, 1982 |
| Priority date | — |
| Expiry date | Mar 16, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T17/086
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In a brake actuator device having a fluid pressure actuated service brake and a spring-applied, fluid pressure released auxiliary brake that cooperates with the service brake via a friction clutch mechanism, there is provided a manual release mechanism for releasing the spring-applied brake in the absence of fluid pressure. The manual release mechanism operates to relieve the tension of the actuating spring by causing the piston through which the spring operates to engage a stop formed on the casing of the brake actuator device, so that the spring is caged at its opposite ends by the casing of the brake actuator device. Extension of a retracting screw to initiate the manual release operation is automatically retracted following engagement of the spring piston with its stop to reset the manual release mechanism in readiness for a subsequent operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.