Fluid-pressure and analogous brake systems – Releasing – Motor
Patent
1984-07-13
1986-03-18
Reger, Duane A.
Fluid-pressure and analogous brake systems
Releasing
Motor
303 9, B60T 1718
Patent
active
045764182
ABSTRACT:
Spring-applied, pressure-released brakes are useful, for example, in construction vehicles or other vehicles that require an automatic braking in the event of an engine failure. In order to tow the vehicle for service, the brakes must be released. Most brake release systems require an alternate pump and associated valves on each vehicle with the fluid from the alternate pump being controlled by the brake valve on the vehicle. The alternate pump on each vehicle add cost to the vehicle and the spool of the brake valve is a known path for fluid leakage thus requiring an alternate pump of a larger capacity than is actually needed. The present brake release mechanism provides an isolating mechanism that is effective to isolate a work port of a brake valve from a valving element in a housing. The isolating mechanism is adapted to connect with an alternate source of pressurized fluid and adapted to direct the pressurized fluid to a brake for release thereof. The isolating mechanism and the alternate source of pressurized fluid are adaptable to several vehicles thus eliminating the need of the alternate pump and associated valves on each vehicle. Furthermore, the alternate source is smaller in capacity since the leakage in the brake valve during towing is eliminated.
REFERENCES:
patent: 3110523 (1963-11-01), Johnson
patent: 3136399 (1964-06-01), Granryd
patent: 3740106 (1973-06-01), Horowitz
patent: 3854559 (1974-12-01), Talak et al.
patent: 3944295 (1976-03-01), Lloyd et al.
patent: 4020932 (1977-05-01), Windish
patent: 4123906 (1978-11-01), Durgan et al.
patent: 4195716 (1980-04-01), Wirt
patent: 4307917 (1981-12-01), Hasselbacher et al.
Fee David M.
Holzinger Charles E.
Burrows J. W.
Caterpillar Tractor Co.
Reger Duane A.
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