Failure warning switch actuator with automatic reset

Details Failure warning switch actuator with automatic reset Failure warning switch actuator with automatic reset

1976-04-21

1977-08-09

Waring, Alvin H.

Communications: electrical

Selective

Having indication or alarm

200 82D, 303 6C, B60T 1722

Patent

active

040414493

ABSTRACT:
A dual circuit brake system has a failure warning section in which the pressures in each of the circuits are sensed by a pair of pistons having a switch actuating shuttle positioned between the pistons by a pair of springs. The ends of the shuttle are telescoped in the pistons for guidance and relative movement. The switch pistons are relatively small with little travel, minimizing displacement loss. The centering springs do not have sufficient load to force the shuttle to the off position once failure in one system has occurred and the pressure in the remaining system has been released. Repair of the failed system allows pressure actuation to move the shuttle back to the deactuated position for automatic reset.

REFERENCES:
patent: 3480333 (1969-11-01), Stelzer
patent: 3606486 (1971-09-01), Doerfler
patent: 3674954 (1972-07-01), Kish et al.
patent: 3733106 (1973-05-01), Rike et al.
patent: 3810142 (1974-05-01), Ito

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