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Class Information
Number: 91/437
Name: Motors: expansible chamber type > With motive fluid valve > Independent control of bypass between opposed working chambers
Description: Apparatus in which the motor comprises a pair of working chambers for driving a single working member in opposite directions by the application of controlled pressure motive fluid to expand one chamber and to contract and expel exhaust motive fluid from the other chamber and in which the valve means controls a fluid line connecting the chambers to permit motive fluid to pass from one chamber to the other, said valve means operating separately from the control of the pressure motive fluid.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7543449 |
Hydraulic system for linear drives controlled by a displacer element |
Jun. 9, 2009 |
| 7487707 |
Hydraulic valve assembly with a pressure compensated directional spool valve and a regeneration shunt valve |
Feb. 10, 2009 |
| 7430953 |
Loading implement and process for loading implement |
Oct. 7, 2008 |
| 7347117 |
Hydraulic linear drive of a transmission actuator |
Mar. 25, 2008 |
| 7249608 |
Flow control for power steering |
Jul. 31, 2007 |
| 7237472 |
Linear hydraulic stepping actuator with fast close capabilities |
Jul. 3, 2007 |
| 7231866 |
Opening and closing switch structure for valve pin control of gas cylinder |
Jun. 19, 2007 |
| 7219592 |
Valve arrangement and hydraulic drive |
May. 22, 2007 |
| 7210395 |
System for handling a tool at a vehicle |
May. 1, 2007 |
| 7174988 |
Power steering system |
Feb. 13, 2007 |
| 7134379 |
Gas cylinder |
Nov. 14, 2006 |
| 7104181 |
Hydraulic control circuit for a hydraulic lifting cylinder |
Sep. 12, 2006 |
| 7096773 |
Telescopic pneumatic device |
Aug. 29, 2006 |
| 7036422 |
Continuously lockable adjusting device |
May. 2, 2006 |
| 7007587 |
Snap-in rotatable cylinder control |
Mar. 7, 2006 |
| 7003949 |
Integrated three function valve |
Feb. 28, 2006 |
| 6990888 |
Mechanism for switching between closed and open center hydraulic systems |
Jan. 31, 2006 |
| 6955115 |
Hydraulic circuit having pressure equalization during regeneration |
Oct. 18, 2005 |
| 6886450 |
Activation device for a piston/cylinder unit which can be inhibited |
May. 3, 2005 |
| 6877417 |
Fluid pressure circuit |
Apr. 12, 2005 |
| 6739129 |
Electrohydraulic motor pump aggregate, attachable element and pressure limiting valve |
May. 25, 2004 |
| 6705201 |
Activation device for a piston/cylinder unit |
Mar. 16, 2004 |
| 6691604 |
Hydraulic system with an actuator having independent meter-in meter-out control |
Feb. 17, 2004 |
| 6658842 |
Hydraulic system |
Dec. 9, 2003 |
| 6422584 |
Hydraulic system for damping the motion of rotation of a swivel joint between two vehicle parts of an articulated vehicle, of an articulated bus for example |
Jul. 23, 2002 |
| 6418715 |
Hydraulic actuating arrangement |
Jul. 16, 2002 |
| 6389952 |
Apparatus and method of operating a fluid cylinder of a work machine |
May. 21, 2002 |
| 6382077 |
Air pressure tube assembly for elevation-adjustable seat stand |
May. 7, 2002 |
| 6354790 |
Attachment for earth-moving machines |
Mar. 12, 2002 |
| 6327956 |
Hydraulic control with improved regenerative valve apparatus and method |
Dec. 11, 2001 |
| 6267548 |
Automatic over center system |
Jul. 31, 2001 |
| 6202410 |
Hydraulic system for forklift |
Mar. 20, 2001 |
| 6186044 |
Fluid control system with float capability |
Feb. 13, 2001 |
| 6173639 |
Fluid control system having float control |
Jan. 16, 2001 |
| 6148947 |
Power assisted steering unit for motor vehicles |
Nov. 21, 2000 |
| 6120237 |
Attachment for groundworking and material handling machines and a strut assembly therefor |
Sep. 19, 2000 |
| 6095028 |
Hydraulic unit |
Aug. 1, 2000 |
| 6079206 |
Hydraulic system and a method for degassing same |
Jun. 27, 2000 |
| 5868216 |
Hydraulic rack-and-pinion steering assembly |
Feb. 9, 1999 |
| 5832805 |
Method and apparatus for controlling speed of hydraulic cylinder |
Nov. 10, 1998 |
| 5826486 |
Hydraulic circuit |
Oct. 27, 1998 |
| 5778755 |
Control valve having a sensor switchable between an open and a closed condition |
Jul. 14, 1998 |
| 5749390 |
Valve having four connection ports and two positions |
May. 12, 1998 |
| 5727444 |
Power steering cylinder assembly |
Mar. 17, 1998 |
| 5718115 |
Constant force hydraulic control system |
Feb. 17, 1998 |
| 5611259 |
Hydraulic circuit for driving a ram of hydraulic press |
Mar. 18, 1997 |
| 5452643 |
Hydraulic power drive unit |
Sep. 26, 1995 |
| 5442992 |
Hydraulic control apparatus with selectively operated check valve assembly |
Aug. 22, 1995 |
| 5381723 |
Hydraulic motor |
Jan. 17, 1995 |
| 5275086 |
Fluid actuator with internal pressure relief valve |
Jan. 4, 1994 |
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