Pneumatic booster having vacuum and pressurized air sources

Details Pneumatic booster having vacuum and pressurized air sources Pneumatic booster having vacuum and pressurized air sources

1994-09-20

1995-12-19

Ryznic, John E.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Activation of one path disables second path

91376R, 91448, F15B 1304, F15B 910, F15B 1108

Patent

active

054760291

ABSTRACT:
A pneumatic booster comprises a piston dividing a housing into front and rear chambers, the front chamber being is constant communication with a vacuum source, the rear chamber being selectively supplied with an atmospheric pressure source or a compressed air source, wherein a valve body of the piston includes a bore having a retainer mounted within, and an input rod movable within the retainer and having a compressed air passage extending therein, the bore of the valve body also having a first rear control valve and a second front control valve, such that movement of the input rod opens the first rear control valve to allow atmospheric air into the booster chamber and a further movement of the input rod opens the second front control valve to allow compressed air into the booster chamber, resulting in an increased output force of the booster.

REFERENCES:
patent: 3295419 (1967-01-01), Vielmo et al.
patent: 3357311 (1967-12-01), Cripe
patent: 3780620 (1973-12-01), Gardner
patent: 4116218 (1978-09-01), Acre et al.
patent: 4309935 (1982-01-01), Belart
patent: 5005465 (1991-04-01), Boehm et al.
patent: 5400693 (1995-03-01), Schluter

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