Power plants – Pressure fluid source and motor – Pulsator
Patent
1989-07-03
1991-01-29
Look, Edward K.
Power plants
Pressure fluid source and motor
Pulsator
60588, 92 84, 92129, B60T 1120
Patent
active
049877399
ABSTRACT:
A dual master cylinder for a vehicle brake system includes a housing having a housing bore with a open end and a closed end. The open end has a piston stop. Two pistons are reciprocably received in the housing bore and define therewith a first pressurizing chamber between the pistons and a second pressurizing chamber between the second piston and the housing bore closed end. Each piston has a piston cavity opening into the respective pressurizing chamber. A first locator member and a second locator member are respectively received in the pressurizing chambers and slidably mounted in the piston cavities of the respective pistons. The first locator member projects into engagement with the rear wall of the second piston and the second locator member projects into engagement with the housing to establish the pistons at respective normal rest positions enabling fluid communication through the port between the fluid reservoir and the respective chambers. A detent associated with each of the locator members permit the collapse of the locator members within the respective piston cavity upon a first occurring forward movement of the pistons forward of the respective normal rest positions, and further acts to retain the locator members in their respective collapsed states. With the locator members remaining in the cavities, the pistons are freed for fore and aft reciprocable movement within the housing during subsequent operation of the master cylinder.
REFERENCES:
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patent: 3376705 (1968-04-01), Valpreda
patent: 3744513 (1973-07-01), Leitenberger
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patent: 4553395 (1985-11-01), Price et al.
patent: 4559781 (1985-12-01), Steer et al.
patent: 4781026 (1988-11-01), Kuromitsu
General Motors Corporation
Leahy Charles E.
Look Edward K.
Verdier Christopher
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