Vehicle brake system

Details Vehicle brake system Vehicle brake system

1980-07-03

1982-07-13

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Multiple systems

Fluid pressure and electric

192 4A, 303 15, 303 71, B60T 1322, B60T 1374

Patent

active

043391540

ABSTRACT:
A vehicle brake system for operating a spring applied, fluid pressure released brake. In order to assure that the brake is fully released before the vehicle is operated, the system requires the operator to perform two operations. He must move a manually operated hydraulic valve to the brake release position and in addition must close a normally open, momentary contact switch which actuates a second solenoid operated valve in series with the first valve to the brake release position. When pressure has built up in the brake actuator sufficiently to assure that it is fully released, a pressure sensor causes a hold-in circuit for the solenoid operated valve to be energized whereupon the operator can then release the momentary contact switch.

REFERENCES:
patent: 3516525 (1970-06-01), Skaggs
patent: 3759357 (1973-09-01), Bianchetta
patent: 3978946 (1976-09-01), Ream
patent: 3985210 (1976-10-01), Hodge et al.
patent: 4181368 (1980-01-01), Strom

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