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| Number | Title | Issue Date |
| 8056467 | Fluid pressure apparatus for a bicycle A fluid pressure apparatus for a bicycle comprises a piston, a housing with a chamber dimensioned to receive the piston therein so that the piston can move axially, and first and second fluid ports in fluid communication with the chamber. The first and second fluid ... | 11/15/2011 |
| 7240605 | Actuator with a variable run The invention concerns a pneumatic and/or hydraulic actuator. The pneumatic and/or hydraulic actuator is one in which the run of a driving shaft, which is pneumatically operated by a piston, can vary on the basis of the insertion in the body of the actuator or at le... | 07/10/2007 |
| 7156183 | Electric hydraulic power unit and method of using same An apparatus includes a housing defining a chamber therein and defining an inlet port and an outlet port and a movable pressure barrier, disposed in the chamber, separating the chamber into first and second portions, the inlet port and the outlet port being in fluid... | 01/02/2007 |
| 7114432 | Torque limiting device for hydraulic piston pump A torque control for a hydrostatic piston pump that provides for a servo piston rod that is connected to the swashplate of the pump and connected to a servo piston within a first cavity that receives compensation pressure that urges the servo piston toward the swash... | 10/03/2006 |
| 7100374 | Piston unit having a captive spring The invention relates to a piston unit having a captive spring for a cylinder, particularly for a tandem master cylinder of a motor vehicle, wherein the spring, with a first end, is supported at least indirectly on a piston and, with a second end, is supported on a ... | 09/05/2006 |
| 7021191 | Accurate fluid operated cylinder positioning system A position control system is used for controlling a fluid operated cylinder having at least one fluid chamber defined by a piston located within a housing for movement between first and second end limits of travel. The system includes at least two electrically actua... | 04/04/2006 |
| 6837145 | Fluid powered actuator A three position fluid powered actuator having a piston reciprocally positioned within a cylindrical chamber in a body. The piston has a socket in communication with an axial opening through the piston. A piston shaft has a first end passing through the axial openin... | 01/04/2005 |
| 6807895 | 3-position stopping cylinder A pusher which has a stroke shorter than that of a piston at either position on a head side or a rod side in a cylinder main body and which serves as both means for pushing the piston from a stroke end back to an intermediate stopping position and means for stopping... | 10/26/2004 |
| 6694866 | High output spring brake actuator Disclosed is a diaphragm-based spring brake actuator assembly which allows for the delivery of more force to the push rod without increasing the size of the actuator unit. The invention allows for the use of a stronger heavy main compression spring in the... | 02/24/2004 |
| 6467393 | Zeroing device for a hydrostatic piston/cylinder unit A zeroing mechanism for a hydrostatic piston/cylinder unit (1), has an actuating piston (2) that can be moved from a zero position N into at least one deflected position A and can be returned to its zero position N by a zeroing force, the zeroing force be... | 10/22/2002 |
| 6435842 | Spring supporting structure of linear compressor The present invention relates to a spring supporting structure of a linear compressor which is capable of reducing the horizontal length of the compressor by reducing the overall length which adds the length of an inner resonance spring to the length of a... | 08/20/2002 |
| 6425313 | Axial piston motor In an axial piston motor having a drive shaft, an inclined plate, and an adjusting device for the inclined plate, and at least one adjusting control cylinder with control piston adapted to establish pressure contact and to cooperate with the inclined plat... | 07/30/2002 |
| 6413057 | Plurality of outer resonance springs for a linear compressor A linear compressor including: a cover fixed at a rear side of a frame; a cylinder fixedly installed in a horizontal direction at the center of inside of the frame; an inner stator assembly fixedly installed at the frame in a state that its inner circumfe... | 07/02/2002 |
| 6015273 | Electromagnetic reciprocating compressor with spring assembly mounted around piston An electromagnetic reciprocating compressor has a body (1, 2), a piston (10) reciprocating in the body, and an electromagnetic drive (22, 23, 24) for the piston. The piston has a piston head (11) which slides in a cylinder (12) in the body to effect compr... | 01/18/2000 |
| 5435229 | Disposable preload tool for vacuum actuators A fluid pressure actuator assembly (44) adapted for use with a valve member (42) is disclosed, the actuator being of the type comprising a housing assembly (50), and an axially moveable diaphragm assembly (56). A linkage member (48) is operably associated... | 07/25/1995 |
| 5291860 | VCT system with control valve bias at low pressures and unbiased control at normal operating pressures The camshaft tends to change in reaction to pulses which it experiences during its normal operation, and it is permitted to change only in a given direction, either to advance or retard, by selectively blocking or permitting the flow of hydraulic fluid, p... | 03/08/1994 |
| 5189942 | 3-position actuator A 3-position actuator having a moving body comprising a piston and piston rod slidingly reciprocating in an axial direction within a casing, a part of the rod protruding from said casing, said moving body being moved to one end side when fluid flows into ... | 03/02/1993 |
| 5161822 | Tilt correction system The invention concerns a tilt correction system with at least one pair of cylinder and piston assemblies which are hydraulically operated. The extent of tilt correction is limited by grooves internal to the cylinders of the assemblies which short hydrauli... | 11/10/1992 |
| 5125326 | Three position actuator having a neutral normal position for shifting a two speed transfer case A three position actuator which is used to position the gear range control lever on a two speed transfer case. Three positions are required to achieve HIGH, LOW and NEUTRAL. Two individual air chambers may be selectively charged with compressed air to mov... | 06/30/1992 |
| 4930464 | Hydraulically operating actuating device for a lift valve A hydraulically operating actuating device for a lift valve, in particular in an internal combustion engine, has a piston which is connected to the valve stem. The piston is positioned in a cylinder and separates two stroke spaces which are connectable, i... | 06/05/1990 |
| 4884495 | Fluid motor actuator with compression spring fail-safe mechanism A fluid motor actuator of the type in which an actuator member is moved in either one of two opposite directions from a rest position to an actuated position includes a fail-safe mechanism having compression springs coupled with the actuator member for co... | 12/05/1989 |
| 4781262 | Vehicle steering system In a steering system in which both front and rear wheels are steerable, the rear road wheels are adapted to be turned in the direction opposite to the direction of turning of the front road wheels only when a steering wheel is turned with a torque or effo... | 11/01/1988 |
| 4759258 | Fluid powered actuator system A fluid powered actuator system includes two identical fluid powered actuators operable by respective supply pressures which are controlled by respective identical valve arrangements. Operating positions of flow control elements of the valve arrangements ... | 07/26/1988 |
| 4723892 | Constant power variable volume pump A pump control module is provided which may form an integral part of a variable volume pump or which may take the form of a pump attachment and which is operative to continually vary the volumetric output in inverse proportion to the operating pressure at... | 02/09/1988 |
| 4716815 | Fluid-pressure-operated actuators A fluid-pressure-operated actuator is arranged to have three set positions and preferably a fail-safe characteristic in one of the three positions. In one embodiment an H-section piston moves in an actuator body and is set in its two extreme positions by ... | 01/05/1988 |
| 4711158 | Linear motion actuator with spring centering means A vacuum operated actuator is provided with a centering mechanism that operates with a single spring to normally locate the output in a mid-position and also return same from both an extended position and a retracted position. The centering mechanism also... | 12/08/1987 |
| 4702333 | Steering apparatus for motor vehicles A steering apparatus for a motor vehicle has a steering gear connected to a first set of vehicle wheels, and a selectable auxiliary steering gear connected to a second set of wheels. The steering gear for the first wheel set is connected to a steering whe... | 10/27/1987 |
| 4669567 | Vehicle steering system A vehicle steering system in which both front and rear road wheels are turnable in opposite directions upon low speed running and in the same direction upon high speed running, and the angle of turning of the rear road wheels for a given steering effort o... | 06/02/1987 |
| 4667574 | Actuator for movement of a tool and a tire carcass transfer device utilizing the actuator A tire carcass transfer device (111) having a hollow housing (112) for receiving a tire carcass (160), a plurality of flexible cups (21) arranged in a circular band around the housing, vacuum means connected to the cups (21) and fluid powered actuators (1... | 05/26/1987 |
| 4628752 | Actuators and actuator assemblies An actuator assembly has two actuators mounted back-to-back such that their actuator rods are displaced in opposite directions. Each actuator has a spring embracing the rod between two slidable collars. The spring urges the collars apart towards stops on ... | 12/16/1986 |
| 4613285 | Piston stroke control device for free piston type oscillating compressors In a free piston type oscillating compressor, closed spaces separate from gas springs are provided, and pressures of the closed spaces are regulated, whereby the amplitude, and central position of the stroke, of a free piston can be precisely controlled.... | 09/23/1986 |
| 4585024 | Air shift conversion apparatus for manual valves An air actuator device is provided for manually operable hydraulic valves having a valve spool moving in a bore in a valve housing in the form of an actuator housing adapted for attachment on the valve housing and having a bore carrying a piston coaxially... | 04/29/1986 |
| 4537293 | Hydraulic cylinder assemblies A drum brake hydraulic wheel cylinder assembly comprises a pair of piston assemblies and an abutment member. The piston assemblies are of the kind comprising an adjustable variable length tappet assembly having interengaged screw-threaded components. To e... | 08/27/1985 |
| 4532431 | Method and apparatus for producing electrical energy from a cyclic combustion process utilizing coupled pistons which reciprocate in unison Method of and device for producing electric energy from a cyclic combustion process. The device includes two oppositely disposed aligned spark ignited internal combustion engine cylinders axially spaced from each other, means rigidly connecting the piston... | 07/30/1985 |
| 4522111 | Double-acting, fluid actuated positioning actuator An infinitely variable, double-acting positioning linear actuator which responds proportionally to fluid pressure includes a hollow cylindrical housing and an actuating rod axially movable through the housing. Two partitions cooperate with the actuating r... | 06/11/1985 |
| 4515065 | Automatic centering servo actuator A high resolution servo actuator is responsive to an electronic control or manual control. An output shaft having fast response and infinite positioning for stroking a manual servo valve on a pump is rotated by hydraulic power. A set of hydraulic working ... | 05/07/1985 |
| 4503767 | Method and apparatus for sustaining an oscillatory movement Method and apparatus for sustaining the oscillatory movement of an oscillating device of the type comprising a mass oscillating between dead points on opposite sides of a point of equilibrium, with a potential force acting to return the mass toward the po... | 03/12/1985 |
| 4478240 | Air pilot valve controller A fluid actuated control device for operable connection with a hydraulic valve, such as a pilot valve, and comprising a coupler bolt secured directly to the valve spool, a fluid actuated cylinder and piston assembly connected with the coupler bolt for rec... | 10/23/1984 |
| 4454800 | Active mechanical hydraulic control apparatus An active, mechanical hydraulic control device for vehicles including watercraft and aircraft, comprises an acceleration pick-up having a relatively small mass. Movements of the mass are sensed by a nozzle and deflection plate system which controls as a p... | 06/19/1984 |
| 4445393 | Fluid actuated shift bar housing assembly A fluid actuated shift bar housing assembly for a change gear transmission wherein the shift bars are biased to an axially centered neutral position by constant fluid pressure in a constantly pressurized chamber and are selectively axially moved to an axi... | 05/01/1984 |
