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Class Information
Number: 91/415
Name: Motors: expansible chamber type > Differential
Description: Apparatus in which the motor is provided with opposed working member faces, motive fluid being applied to or evacuated from one of said faces to cause the working member to move in one direction and being applied simultaneously to or evacuated simultaneously from both of said faces to cause the working member to move in the opposite direction or to slow the movement in said one direction.

Sub-classes under this class:

Class Number Class Name Patents
91/417R Motive fluid constantly applied to one working member face (235) (321) 137
91/416 Opposing pressure applied by bypassing 51

Patents under this class:

Patent Number Title Of Patent Date Issued
8371552 Shift actuator valve having a pressure dead band Feb. 12, 2013
7647858 Differential piston Jan. 19, 2010
7581486 Hydraulic system Sep. 1, 2009
7216577 Vacuum booster with low force loss May. 15, 2007
6817859 Drive device for a movable part, especially a mold closure device for an injection molding machine, and method for operating such a drive device Nov. 16, 2004
6712587 Hydraulic amplifier pump for use in ultrahigh pressure liquid chromatography Mar. 30, 2004
6269733 Force servo actuator with asymmetric nonlinear differential hydraulic force feedback Aug. 7, 2001
5836400 Three speed circuit for hydraulic tool Nov. 17, 1998
5662021 Control system for a movement actuator Sep. 2, 1997
5611259 Hydraulic circuit for driving a ram of hydraulic press Mar. 18, 1997
5575150 Stiffness enhanced electrohydrostatic actuator Nov. 19, 1996
5542336 Positioning apparatus and method utilizing PWM control of a double-acting hydraulic cylinder Aug. 6, 1996
5540048 Continuously variable hydrostatic transmission including a pulse width modulation ratio controller Jul. 30, 1996
5481959 Automatic air balancer system Jan. 9, 1996
5370038 Regeneration circuit for a hydraulic system Dec. 6, 1994
5370037 Control valve means Dec. 6, 1994
5127315 Brake motor subassembly and process for adjusting such a subassembly Jul. 7, 1992
4958548 Hydraulic drive mechanism Sep. 25, 1990
4877217 Fail-safe blowout preventer Oct. 31, 1989
4807517 Electro-hydraulic proportional actuator Feb. 28, 1989
4744286 Brake motor subassembly May. 17, 1988
4700612 Electropneumatic drive system for crust breaking devices and process for operating the same Oct. 20, 1987
4606257 Electropneumatic drive system for crust breaking devices and process for operating the same Aug. 19, 1986
4587886 Power steering device May. 13, 1986
4579040 Power steering device Apr. 1, 1986
4562902 Brake system Jan. 7, 1986
4552330 Pressure medium actuated valve Nov. 12, 1985
4519573 Device for the actuation of a slide valve May. 28, 1985
4449896 Hydraulic operated surface pumping unit May. 22, 1984
4349175 Valve actuator having a continuously charged accumulator Sep. 14, 1982
4318333 Bidirectional, multiple speed hydraulic actuator Mar. 9, 1982
4275642 Air actuated fail-safe actuator encapsulated within accumulator tank Jun. 30, 1981
4253692 Control system for material placement buckets Mar. 3, 1981
4205208 Double-flow compressed-gas operating mechanism for a high-voltage circuit-breaker May. 27, 1980
4182219 Hydraulic control system for two operating cylinders Jan. 8, 1980
4132290 Locking mechanism for movable vehicle members Jan. 2, 1979
4103592 Valve operator Aug. 1, 1978
4046060 Hydraulic control systems for use with mining apparatus Sep. 6, 1977
3981228 Hydraulic control system Sep. 21, 1976

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