Power plants – Pressure fluid source and motor – Pulsator
Patent
1980-11-06
1983-06-14
Hershkovitz, Abraham
Power plants
Pressure fluid source and motor
Pulsator
605473, 91384, 91391R, 91434, B60T 1312
Patent
active
043875696
ABSTRACT:
A hydraulic brake booster which has an input valve control member acting through a controlled rate spring and through a lever pivoted on the booster housing in the power chamber to move a spool valve in a bore parallel to the power piston so that the input is strictly through the spring. The lever has no connection to the power piston. The control valve is hydraulically unbalanced to a release position and is also urged to the release position by a valve spring. This maintains a proportion between the input force due to the reaction spring, through which input force is applied, and booster pressure. Upon power runout or failure the input and reaction piston overtravels and contacts the output rod to move that rod without moving the power piston.
REFERENCES:
patent: 3603209 (1971-09-01), MacDuff
patent: 3625005 (1971-12-01), Saunders
patent: 3638427 (1972-02-01), Meyers
patent: 3664130 (1972-05-01), Meyers
patent: 3831494 (1974-08-01), Carre
patent: 3877227 (1975-04-01), Demido
patent: 3915066 (1975-10-01), Thomas
patent: 3995529 (1976-12-01), Bach
patent: 4050251 (1977-09-01), Carre
patent: 4296674 (1981-10-01), Monroe
Flory Donald M.
Peeples Denny L.
General Motors Corporation
Hershkovitz Abraham
McGraw D. D.
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