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Class Information
Number: 91/47
Name: Motors: expansible chamber type > Constantly applied motive fluid with controlled venting
Description: Apparatus in which a motor working chamber and working member are in continuous communication with a supply of motive fluid under all conditions of operation of the motor, the movement of the motor working member being controlled by the operation of the motor, the movement of the motor working member being controlled by the operation of an outlet to selectively or adjustably connect said working chamber to a region of continually lower pressure to allow escape of motive fluid, the pressure in said region being constant, e.g., atmospheric, etc.










Sub-classes under this class:

Class Number Class Name Patents
91/50 Cyclically operable 38
91/49 Fluid vented through working member 50
91/51 Motive fluid constantly applied to and vented from opposed chambers 42
91/48 Plural separately controlled vents 17


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8322470 Maneuvering robotic vehicles having a positionable sensor head Dec. 4, 2012
7194990 Electro-hydraulic engine valve actuation Mar. 27, 2007
7146901 Hydraulic system Dec. 12, 2006
6272852 High speed actuators and vibrators based on electro-rheological fluids Aug. 14, 2001
6138789 Hydraulic rack and pinion steering Oct. 31, 2000
5839887 Internal-combustion engine having a specific-purpose pressure storage tank Nov. 24, 1998
5377578 Torque control system Jan. 3, 1995
5237905 Device for limiting a working stroke of a hydraulic cylinder Aug. 24, 1993
5209063 Hydraulic circuit utilizing a compensator pressure selecting value May. 11, 1993
5081902 Apparatus for providing relief to a working chamber Jan. 21, 1992
5072648 Control system for a fluid operated jack Dec. 17, 1991
4903940 Device for positioning an adjusting member Feb. 27, 1990
4862972 Single-blow pneumatic percussive tool Sep. 5, 1989
4825745 Electrohydraulic control system May. 2, 1989
4811649 Hydraulic control apparatus Mar. 14, 1989
4794843 Hydraulic valve for controlling single-acting cylinder Jan. 3, 1989
4727791 Apparatus for controlling a hydraulic single acting cylinder Mar. 1, 1988
4692574 Differential pressure responsive switch Sep. 8, 1987
4561344 Electro-fluidic control device Dec. 31, 1985
4557181 Brake cylinder/air reservoir device Dec. 10, 1985
4497376 Interchangeable ram diesel pile Feb. 5, 1985
4362084 Hydraulic actuator controls Dec. 7, 1982
4361073 Sub-critical time modulated control mechanism Nov. 30, 1982
4359929 Negative rate compensated hydraulic servo system Nov. 23, 1982
4343224 Automatic control system Aug. 10, 1982
4333492 Liquid inertia tool Jun. 8, 1982
4283990 Fluidic repeater Aug. 18, 1981
4280395 Hydraulic brake booster Jul. 28, 1981
4278009 Hydraulic brake booster Jul. 14, 1981
4250360 Device to automatically activate or deactivate control means Feb. 10, 1981
4218955 Pressure actuated shifting mechanism Aug. 26, 1980
4217471 Fluidic actuator for a switching device Aug. 12, 1980
4204456 Pneumatic ejector for bomb May. 27, 1980
4203349 Brake booster May. 20, 1980
4187708 Pulling apparatus and method Feb. 12, 1980
4178894 Nonpolluting liquid fuel system for engines Dec. 18, 1979
4154146 Two stage vacuum break May. 15, 1979
4142612 Servo motor with differential pressure controlled and actuated release valve Mar. 6, 1979
4121512 Fluid system for compacting and squeezing apparatus Oct. 24, 1978
4048866 Apparatus for use in controlling the tension of a chain or chains of mining equipment Sep. 20, 1977
4044651 Pneumatic function generator assembly Aug. 30, 1977
4033525 Feedback PDM encoder and method for actuating a pneumatic actuator with a digital autopilot Jul. 5, 1977
4033232 Charge forming device Jul. 5, 1977
4010674 Speed responsive systems Mar. 8, 1977
4009640 Anti-lock brake system Mar. 1, 1977
3994434 Variable volume air damper control having a damped actuator Nov. 30, 1976
3992978 Fluid motor and fluid control means therefore Nov. 23, 1976
3967636 Valve for force-reversing modulator Jul. 6, 1976
3965223 Charge forming device Jun. 22, 1976
3949783 Dual Pump draft control valve Apr. 13, 1976

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