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

Expansible chamber devices – Rectilinearly moving working member and coaxial or parallel...

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Details

188170, 188106F, 192 91A, 92 63, F01B 304, F01B 704

Patent

active

043610781

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.

REFERENCES:
patent: 4018140 (1977-04-01), Engle
patent: 4063491 (1977-12-01), Roger et al.
patent: 4226168 (1980-10-01), Staltmeir
patent: 4280398 (1981-07-01), Kerscher

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