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Class Information
Number: 91/440
Name: Motors: expansible chamber type > With motive fluid valve > For exhausting contracting working chamber to expanding opposed nonworking
Description: Apparatus in which the motor includes a nonworking chamber and the valve means acts to exhaust motive fluid from the contracting working chamber to the nonworking chamber which is expanded due to the movement of the working member contracting the working chamber.


Patents under this class:

Patent Number Title Of Patent Date Issued
7603856 Heavy-construction machine Oct. 20, 2009
6295917 Lost motion cylinder Oct. 2, 2001
6267041 Fluid regeneration circuit for hydraulic cylinders Jul. 31, 2001
6148711 Normally-closed diaphragm check valve Nov. 21, 2000
6095028 Hydraulic unit Aug. 1, 2000
5950427 Fail-safe electric hydraulic actuator Sep. 14, 1999
5893317 Pneumatic beater Apr. 13, 1999
5740988 Axisymmetric vectoring nozzle actuating system having multiple power control circuits Apr. 21, 1998
5615595 Tandem cylinder control Apr. 1, 1997
5415076 Hydraulic system having a combined meter-out and regeneration valve assembly May. 16, 1995
5275086 Fluid actuator with internal pressure relief valve Jan. 4, 1994
5214997 Control circuit for a double-acting hydraulic jack and slide distributor for such a circuit Jun. 1, 1993
5140895 Valve mechanism for controlling a pressure difference between an upper and a lower chamber of a hydraulic cylinder for a die cushion for a press Aug. 25, 1992
5129311 Piston assembly with primary and co-centric secondary portions Jul. 14, 1992
5086688 Hydraulic booster device with valve means for damping of input rod Feb. 11, 1992
5065664 Control circuit for a cylinder allowing flow between an upper and a lower chamber Nov. 19, 1991
5046402 Rotary to axial motion converting device with groove in piston guide Sep. 10, 1991
5038669 RAM piston with internal reservoir and check valve Aug. 13, 1991
5031508 Rivet setting tool Jul. 16, 1991
5007327 Servo actuator Apr. 16, 1991
4964273 Subplate-mounted control valves in convertible oscillator drive system Oct. 23, 1990
4955282 Uniform flow hydraulic system Sep. 11, 1990
4861259 Mold clamping device Aug. 29, 1989
4773300 Three-position working cylinder having dual concentric pistons Sep. 27, 1988
4221158 Pneumatic actuator Sep. 9, 1980
4087073 Safety valve with a hydraulic actuator May. 2, 1978



 
 
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