Fluid-pressure and analogous brake systems – With pump
Patent
1982-03-29
1984-06-26
Stoner, Jr., Bruce H.
Fluid-pressure and analogous brake systems
With pump
303 71, B60T 1316
Patent
active
044563116
ABSTRACT:
A brake control for a vehicle, especially a heavy work vehicle, having both service and emergency braking systems, each system having its own hydraulic actuator, having a fluid reservoir, a hydraulic pump and a manually actuable control valve wherein the control valve includes a variable pressure regulating portion having an inlet from the pump, an outlet to the service brakes and a spool controlling the outlet pressure to the service brakes. The control valve also has a three-way valve portion having an inlet from the pump and an outlet to the emergency brake actuators, preferably the pressure-release, spring-apply type, and an externally controlled valve stem with a wide groove which supplies pressure to the emergency brake actuators continually over much of its travel while operating the service brake portion through a compression spring disposed between the stem and the spool. Near the end of its travel, the three-way valve portion switches to connect the pressure outlet to the hydraulic reservoir allowing the springs to apply the emergency brakes. The control valve could have other uses than the braking system taught wherein the three-way valve switching occurs before the substantial stem travel portion during which the primary operation of regulating portion of the valve takes place.
REFERENCES:
patent: 3479096 (1969-11-01), Cruse
patent: 3977732 (1976-08-01), Grosseau
Deutsch Barry E.
Dresser Industries Inc.
Oberley Alvin
Stoner Jr. Bruce H.
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