Vehicle brake system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 13, 1982
Grant Date -
N/A
app pub date -
Jul 3, 1980
filing date -
Jul 3, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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