Plural relatively movable or rigidly interconnected working members > Patents

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Class Information
Number: 91/508
Name: Motors: expansible chamber type > Plural relatively movable or rigidly interconnected working members
Description: Apparatus having plural working members which are either (a) relatively movable, or (b) connected to move together as a unit under all conditions of operation and which have different faces forming moving walls of different working chambers which regardless of the positions of the different faces are not in fluid communication during at least some part of the operation of said apparatus, said faces being urged in the same direction either simultaneously or sequentially by working fluid in said chambers.

Sub-classes under this class:

Class Number	Class Name	Patents
91/511	Condition responsive means for modifying working member operation	33
91/509	Having (1) stand-by or (2) redundant means enabling load to be driven upon failure of primary load moving means	56
91/520	Motors connected in series	110
91/535	Relatively movable working members of unequal cross-sectional areas	21
91/521	Separate valve means actuatable by a common nonmanual actuator or separately actuatable means with common manual actuator	37
91/533	Single valve for plural rigidly connected working members	53
91/534	Single valve for relatively movable working members driving common load	39
91/536	Single valve for relatively movable working members	64
91/532	With means for proportioning motive fluid supply to plural motors	90
91/519	With means for selectively changing the speed or force exerted on load by the selective application of motive fluid in a single direction to one or more working members	137
91/525	With means to control the working fluid to one working member for movement relative to another without controlling the working fluid to the other working member by said means	37

Patents under this class:

1 2

Patent Number	Title Of Patent	Date Issued
7444922	Fastening assembly, fastener, and fluid pressure cylinder unit	Nov. 4, 2008
7428861	Valve for hydraulic props of shield-type support frames, and shield-type support frame	Sep. 30, 2008
7383681	Method and apparatus for coordinated linkage motion	Jun. 10, 2008
7370615	Variable valve actuator	May. 13, 2008
7290509	Variable valve actuator	Nov. 6, 2007
7284468	Blade holder having displacement-dependent spring force compensation	Oct. 23, 2007
7213549	Variable valve actuator	May. 8, 2007
7044705	Load handling machine	May. 16, 2006
6968688	Two-cycle hot-gas engine	Nov. 29, 2005
6817067	Tandem electrohydrostatic actuator	Nov. 16, 2004
6739130	Linear actuator	May. 25, 2004
6386508	Actuator having dual piston surfaces	May. 14, 2002
6253549	Toroidal hydraulic actuator	Jul. 3, 2001
5707201	Forklift truck side shifter	Jan. 13, 1998
5653155	Method and apparatus for single lever control of multiple actuators	Aug. 5, 1997
5636713	Multiple RAM assembly and recuperative drive system for hydraulic lift	Jun. 10, 1997
5595148	Hydraulic valve control device	Jan. 21, 1997
5579677	Actuator operating signal sensor	Dec. 3, 1996
5542339	Tube clamp for bundling a set of tubes for shipment and for mounting them to a loader boom	Aug. 6, 1996
5469946	Clutch actuation system	Nov. 28, 1995
5387089	Method and apparatus for compressing gases with a liquid system	Feb. 7, 1995
5340264	Reciprocating floor conveyor	Aug. 23, 1994
5323687	Hydraulic circuit	Jun. 28, 1994
5308219	Process for automatically controlling actuators of excavator	May. 3, 1994
5241819	Tappet valve assembly for automatic railway vehicle couplers	Sep. 7, 1993
5235898	Actuator with wear compensating chamber	Aug. 17, 1993
5233911	Tandem brake booster	Aug. 10, 1993
5222426	Proportional distributor and control system for a plurality of hydraulic receivers incorporating a distributor of this kind for each receiver	Jun. 29, 1993
5169295	Method and apparatus for compressing gases with a liquid system	Dec. 8, 1992
5101629	Hydraulic circuit system for working machine	Apr. 7, 1992
5028199	Apparatus for controlling speed of working machine in the form of a construction machine	Jul. 2, 1991
4969349	Synchronized dual axis actuator	Nov. 13, 1990
4966246	Four wheel steering system	Oct. 30, 1990
4915186	Hydraulic steering systems dampening devices	Apr. 10, 1990
4850737	Hydraulic spring vehicle barricade and hydraulic circuit therefor	Jul. 25, 1989
4708581	Method of positioning a transfer arm	Nov. 24, 1987
4647267	Fork and arm mechanism for refuse container	Mar. 3, 1987
4567811	Telescopic cylinder	Feb. 4, 1986
4489624	Triaxial hinge for robots, handling apparatus and the like	Dec. 25, 1984
4215622	Hydraulic control system	Aug. 5, 1980
4214445	Hydraulic circuitry for raise drill apparatus	Jul. 29, 1980
4207805	Feed beam	Jun. 17, 1980
4182585	Double-plate control device	Jan. 8, 1980
4169404	Fluid pressure actuator	Oct. 2, 1979
4158326	Control device	Jun. 19, 1979
4149565	Pilot controlled poppet valve assembly	Apr. 17, 1979
4145957	Pilot-operated valve structure	Mar. 27, 1979
4128047	Actuator with locking valves	Dec. 5, 1978
4128380	Fluid pressure actuated drive for the closing unit of an injection moulding machine	Dec. 5, 1978
4128112	Spool valve for hydraulic brake booster	Dec. 5, 1978