Hydraulic brake actuator having spring-applied back- up...

Details Hydraulic brake actuator having spring-applied back- up... Hydraulic brake actuator having spring-applied back- up...

B - Operations, Transporting

61

H

188/77

B61H 13/06 (2006.01) B60T 17/08 (2006.01)

Patent

CA 1166977

(Case No. 7122) ABSTRACT OF THE DISCLOSURE 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 serverce 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 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 rediness for a subsequent operation.

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