Motors: expansible chamber type – Constantly applied motive fluid with controlled venting – Fluid vented through working member
Patent
1975-09-26
1977-02-15
Maslousky, Paul E.
Motors: expansible chamber type
Constantly applied motive fluid with controlled venting
Fluid vented through working member
91369B, 91372, 91413, 91431, 91449, F15B 910, F15B 1306
Patent
active
040076644
ABSTRACT:
A hydraulic booster has its piston located in a normal passive position so that hydraulic fluid supplied to the cylinder through an inlet port enters the cylinder on both sides of the piston. Normally open valve means establishes communication through the piston from one side thereof to the other, and operating means is provided for closing the valve means and moving the piston past the inlet port to a position wherein hydraulic fluid flows through the inlet port into the cylinder on only one side of the piston. The normally open valve means includes an elongated valve sleeve slidably mounted in a piston bore having an enlarged intermediate portion defining a cavity surrounding the sleeve member. The sleeve member has a large external area within the cavity facing in one direction than in the other direction, and a leakage path is provided for communication of the cavity with the cylinder on one side of the piston. Pressurization of the cavity causes fluid pressure to act on the larger external area of the sleeve member for biasing same in one direction with a force proportional to the pressure acting on the piston.
REFERENCES:
patent: 3148592 (1964-09-01), Schultz et al.
patent: 3482485 (1969-12-01), Abbot
patent: 3502001 (1970-03-01), Moore
patent: 3661054 (1972-05-01), Brown
patent: 3810680 (1974-05-01), Schenk
patent: 3813992 (1974-06-01), Brown
Maslousky Paul E.
Midland-Ross Corporation
Switzer H. Duane
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