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Class Information
Number: 60/475
Name: Power plants > Pressure fluid source and motor > Pump means moves motive fluid from one chamber to an opposite chamber of opposed expansible chambers having a common output > With means compensating for charge leakage or volume difference between discharging and receiving chambers
Description: Apparatus in which fluid is moved between two cylinders, one of which is increased in size while the other is decreased in the to and fro operation of an output member, the system having a structure that compensates for the difference in volume of the two cylinders or which corrects for any unbalance caused by leakage between parts of the system.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7234298 |
Hybrid hydraulic system and work machine using same |
Jun. 26, 2007 |
| 7174988 |
Power steering system |
Feb. 13, 2007 |
| RE39158 |
Hydraulic system, manifold and volumetric compensator |
Jul. 11, 2006 |
| 7055319 |
Piston and cylinder assembly with volume compensating system |
Jun. 6, 2006 |
| 7051526 |
Closed-system electrohydraulic actuator |
May. 30, 2006 |
| 6984113 |
Oil pressure operated pump for marine steering gears with a valve set shell with valves separately capable of assembly with the valve housing |
Jan. 10, 2006 |
| 6979185 |
Bi-rotational pump/hydraulic actuator |
Dec. 27, 2005 |
| 6912849 |
Cylinder driving system and energy regenerating method thereof |
Jul. 5, 2005 |
| 6889501 |
Hydraulic swinging-leaf door drive |
May. 10, 2005 |
| 6886332 |
Bi-rotational, two-stage hydraulic system |
May. 3, 2005 |
| 6796120 |
Electrohydraulic actuator |
Sep. 28, 2004 |
| 6751954 |
Compact hybrid actuator |
Jun. 22, 2004 |
| 6662559 |
Hydraulic actuator |
Dec. 16, 2003 |
| 6591607 |
Hydraulic manipulator |
Jul. 15, 2003 |
| 6557344 |
Hydraulic drive with several hydraulic consumers also comprising a differential cylinder |
May. 6, 2003 |
| 6519939 |
Hydraulic system, manifold and volumetric compensator |
Feb. 18, 2003 |
| 6481202 |
Hydraulic system for boom hoist cylinder crane |
Nov. 19, 2002 |
| 6290474 |
Machine hydraulic system |
Sep. 18, 2001 |
| 6055809 |
Remote steering system with a single rod cylinder and manual hydraulic piston pump for such a system |
May. 2, 2000 |
| 5937646 |
Hydraulic charge boost system for a gantry crane |
Aug. 17, 1999 |
| 5613361 |
Hydraulic circuit for supplying a plurality of series-operated of a hydraulically controlled installation |
Mar. 25, 1997 |
| 5329767 |
Hydraulic circuit flow control |
Jul. 19, 1994 |
| 5179836 |
Hydraulic system for a differential piston type cylinder |
Jan. 19, 1993 |
| 5148901 |
Hub clutch for automotive vehicle |
Sep. 22, 1992 |
| 5144801 |
Electro-hydraulic actuator system |
Sep. 8, 1992 |
| 5069037 |
Fluid supply system for vehicles |
Dec. 3, 1991 |
| 5063740 |
Electrohydraulic servodevice for position control |
Nov. 12, 1991 |
| 4961316 |
Controlled electric pump drive for hydraulic lifting arrangement with gas spring in motor |
Oct. 9, 1990 |
| 4953639 |
Closed loop hydraulic drill feed system |
Sep. 4, 1990 |
| 4811562 |
Adjusting drive |
Mar. 14, 1989 |
| 4753071 |
Self-powered rotating-cylinder type linear actuator utilizing rotation-generated centrifugal head for piston positioning |
Jun. 28, 1988 |
| 4667472 |
Electric integrated actuator with variable gain hydraulic output |
May. 26, 1987 |
| 4590764 |
All-digital electrically powered servo |
May. 27, 1986 |
| 4532764 |
Reaction type hydraulic steering control unit |
Aug. 6, 1985 |
| 4520626 |
Hydraulic drive system for single rod cylinder |
Jun. 4, 1985 |
| 4343153 |
Anti-supercharge pressure valve |
Aug. 10, 1982 |
| 4342164 |
Counterbalancing hydraulic system |
Aug. 3, 1982 |
| 4010609 |
Jack-pump device |
Mar. 8, 1977 |
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