Fluid-pressure and analogous brake systems – Motorman's valves
Patent
1979-08-13
1981-08-18
Reger, Duane A.
Fluid-pressure and analogous brake systems
Motorman's valves
B60T 1506, B60T 1318
Patent
active
042843090
ABSTRACT:
PCT No. PCT/US79/00595 Sec. 371 Date Aug. 13, 1979 Sec. 102(e) Date Aug. 13, 1979 PCT Filed Aug. 13, 1979 PCT Pub. No. WO81/00386 PCT Pub. Date Feb. 19, 1981
Conventional fluid control circuits for service brakes and the like do not always provide an operator with "pedal feel" to indicate the degree of brake engagement. Such "pedal feel" is particularly desirable in braking systems wherein the brakes thereof are spring-engaged and released by hydraulic fluid pressure. This invention provides a control valve (18) having an inlet (20), an outlet (21), a valve member (19) movable betweeen closed and open position, and a first spring (30) for urging the valve member (19) toward its closed position. An operator input (36) is adapted to apply variable input force to the valve (18) to reduce the closing force of the first spring (30) and a second spring (33) is provided for applying a progressively increased opposing force to the operator's input force to provide the operator with "pedal feel" to indicate the degree of engagement of the brakes (15). A pair of passages (24,39) communicate the inlet (20) with opposite ends of the valve member (19) to aid in providing such "pedal feel."
REFERENCES:
patent: 2450275 (1948-06-01), Eaton
patent: 3227494 (1966-01-01), Alfieri
Caterpillar Tractor Co.
Reger Duane A.
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