Motors: expansible chamber type – With motive fluid valve – Independent control of bypass between opposed working chambers
Patent
1979-01-15
1982-02-09
Cohen, Irwin C.
Motors: expansible chamber type
With motive fluid valve
Independent control of bypass between opposed working chambers
91439, 91448, 91464, F15B 13042
Patent
active
043145027
ABSTRACT:
In combination with a double-acting cylinder having pressure and exhaust ports, a cylinder control valve having a spool having a pair of control positions with pressure, cylinder and exhaust ports, and conduits between the valve cylinder ports and cylinder ports, and a source of compressed air connected to the valve pressure port, a safety control system which comprises a pilot-operated valve housing having a pressure port connected to the source of compressed air, a pilot port and a pair of cylinder ports connected to the cylinder conduits. A valve spool within said housing has first and second control positions with an operative device on the housing which normally biases the safety valve spool to a first control position pressurizing opposite ends of the cylinder and with the pilot port connected to the source of compressed air. A build up of pressure to the pilot port moves the safety valve spool to its second control position, blocking communication between the safety valve and the cylinder ports. The spool of the cylinder control valve has a normal central position blocking the conduits to the cylinder assembly ports. The safety valve spool is adapted to automatically return to its first position on disconnecting pressure from said pressure source, bleeding opposite ends of the cylinder.
REFERENCES:
patent: 3335739 (1967-08-01), Rice
patent: 3366016 (1968-01-01), Anderson
patent: 3385169 (1968-05-01), Hale et al.
patent: 3472127 (1969-10-01), Scheidt
patent: 3543641 (1970-12-01), DePlante
patent: 4024796 (1977-05-01), Theobald
Brinkel Edwin P.
Dellach Philip J.
Cohen Irwin C.
ISI Fluid Power, Inc.
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