Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Position responsive
Patent
1983-06-06
1986-02-11
Hershkovitz, Abraham
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
Position responsive
91391R, 91408, 91422, 92 29, F15B 1522
Patent
active
045692718
ABSTRACT:
An hydraulic booster has a housing provided with a bore, an inlet connected to a source of pressure fluid, and an outlet connected to a reservoir for fluid, a boost piston being advanced in the bore in response to pressurization of a boost chamber, the boost chamber being pressurized under the control of a valve mechanism operative in response to a load applied to an input member. Two connections are provided between the source and the boost chamber, both connections being closed when the booster is inoperative, and when the booster is operated the first connection is opened following initial movement of the input member, and the second connection is opened following initial movement of the boost piston in response to pressurization of the boost chamber. Thus the booster is in a closed center mode when inoperative, but operates in an open center mode. The connections are preferably controlled by valves. The input load may be applied in tension or compression.
REFERENCES:
patent: 2957311 (1960-10-01), Stelzer
patent: 3060894 (1962-10-01), Dean, Jr.
patent: 3087466 (1963-04-01), Tobias
patent: 3618321 (1971-11-01), Moran
patent: 4173171 (1979-11-01), Lange
patent: 4280395 (1981-07-01), Shaw
patent: 4433543 (1984-02-01), Thomas
Hershkovitz Abraham
Lucas Industries Public Limited Company
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