Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 8151691 | Variable compression ratio piston with rate-sensitive response A hydraulic variable compression ratio (VCR) piston for use in an internal combustion engine. The piston is a two-part piston, in which a gudgeon pin carrier slides within an outer sleeve. A variable volume upper chamber is formed between the top of the gudgeon pin ... | 04/10/2012 |
| 7275477 | Piston assembly for air pump A piston assembly of an air pump is provided herein. The piston of the piston assembly has a through exhaust channel along the direction of the piston's back-and-forth movement. The exhaust channel is made up of two aligned exhaust holes, and a space is preserved at... | 10/02/2007 |
| 7228788 | Piston structure for an air pump A piston for an air pump is disclosed. The piston has a piston rod having a connecting axle hole for positioning a bearing, which is protected with a bearing protection cap. The bearing is firmly secured within the axle hole. ... | 06/12/2007 |
| 7178237 | Piston for a piston-cylinder arrangement, in particular a shock absorber piston The invention relates to a piston for a piston-cylinder arrangement, especially a shock absorber piston, comprising a piston body that is fitted with at least one peripheral web on its peripheral surface, wherein a collar-shaped sealing element made of thermoformabl... | 02/20/2007 |
| 7168360 | Steering system actuator for vehicle with at least three steered wheels A linear actuator for vehicle power steering systems with at least three steered wheels of a double-acting type that comprises a cylindrical body, closed at opposite ends; a piston, accommodated inside the cylindrical body axially slideable between the ends; and a s... | 01/30/2007 |
| 7143684 | Hydraulic actuator having disc valve assembly A hydraulic actuator comprises piston that divides the interior into a piston chamber and a rod chamber and a valve disc assembly to regulate flow of hydraulic fluid between the piston chamber and the rod chamber through a passage in the piston. The disc valve assem... | 12/05/2006 |
| 7093435 | Hydraulic controller A hydraulic controller includes: a pair of liquid chambers; and an on-off valve capable of opening and closing a flow channel on the side of the liquid chamber with a higher hydraulic pressure out of the pair of liquid chambers. The flow channel can provide communic... | 08/22/2006 |
| 7065852 | Method of manufacturing hydraulic shock absorber and production system for shock absorber in plant A method of manufacturing a hydraulic shock absorber is provided with a piston main body manufacturing step 21 including the process of sintering of the piston main body and the process of forming of the molded sealing are performed, a piston assembly manufac... | 06/27/2006 |
| 7040468 | Hydraulic shock absorber A hydraulic shock absorber includes a cylindrical housing within which a piston assembly is slidably received. The piston assembly includes a piston element connected to a piston rod and adapted to divide an interior of the housing into compression and rebound chamb... | 05/09/2006 |
| 6880335 | Stirling cycle cryocooler with improved magnet ring assembly and gas bearings A piston assembly for use in a motor comprises a cylinder having a bore, an electrically conductive piston reciprocally disposed within the cylinder bore, a gas cavity formed within the piston, and one or more gas bearings associated with the piston, each of the one... | 04/19/2005 |
| 6802701 | Suction valve assembly of compressor A suction valve assembly of a compressor includes: a piston disposed movable in a cylinder forming a compression chamber, having a suction passage for sucking a fluid and a valve seat formed at a front side thereof; a valve body contacted to the valve seat to open a... | 10/12/2004 |
| 6272750 | Hydrostatic pre-load piston A machine tool comprising a base, with a guide surface, a workpiece holder on the base, a movable tool carriage, and a motor for advancing the carriage along the guide surfaces toward the workpiece. Hydrostatic bearings are situated in the carriage for di... | 08/14/2001 |
| 6089931 | Trim-tilt device for marine propulsion device A trim-tilt device for a marine propulsion device includes a piston having a valve device for stopping a trim action by bringing a piston-side chamber and a rod-side chamber into communication with each other at an end of a trim region before a propeller ... | 07/18/2000 |
| 6089142 | Piston head for a hydraulic shock absorber A piston (3) for a hydraulic dashpot for motor vehicles, mounted on one end of a piston rod (1) and dividing a cylinder (5) into a two compartments (6 & 7), with two groups of lines (8 & 9) arranged more or less in concentric circles and more or less para... | 07/18/2000 |
| 6070691 | Self-aligning hydraulic steering system A self-aligning steering system for a vehicle having a steering wheel and a plurality of front wheels. The invention has a hydraulic fluid circulation means responsive to the steering wheel and a left and a right hydraulic cylinder for maneuvering the fro... | 06/06/2000 |
| 5836749 | Piston type liquid fuel pump with an improved inlet valve A fuel injection system for injecting gasoline or other fuel directly into the combustion chambers of an internal combustion engine including a fuel pump with a plurality of fuel pumping pistons mounted within cylinders formed in a fixed barrel member. Ea... | 11/17/1998 |
| 5802953 | Power tilt cylinder device In a power tilt cylinder device 100, a hydraulic fluid is supplied to the opposite piston side space 22B of a free piston 25, in the upper limit position of upward tilting, which is performed for discharging the hydraulic fluid from the first chamber 21, ... | 09/08/1998 |
| 5794517 | Piston assembly A piston assembly that is movable back and forth parallel to its axis in a cylindrical housing, comprising a piston-like support part made of a hard material and a guide ring made of a polymer. The guide ring surrounds the support part along a portion of ... | 08/18/1998 |
| 5784920 | Actuator-punch assembly with forming die installation A forming die set has one or more independently operated hydraulic actuator assemblies mounted directly in one of the die shoes to enable a programmed piercing pattern to be carried out at the time the workpiece is formed. Each actuator assembly includes ... | 07/28/1998 |
| 5572922 | Actuating plunger of an electromagnetic pump Disclosed is an actuating plunger of an electromagnetic pump, the actuating plunger having a good magnetic characteristic so as to improve the operational efficiency of the electromagnetic pump and reduce the vibration and the operational noise due to the... | 11/12/1996 |
| 5485726 | Pressure control apparatus for stirling module An improved pressure control apparatus for a stirling module capable of controlling a pressure between compression space and a bounce space by providing an improved pressure control apparatus, so that a high speed operation of a stirling module can be obt... | 01/23/1996 |
| 5476371 | Compressor suction valve of toroidal shape with a radial finger A compressor assembly is disclosed including a compressor mechanism mounted within a hermetically sealed housing. A cylinder block contains a reciprocating piston having a suction valve assembly. The piston includes a head with a deep semitorus shaped ann... | 12/19/1995 |
| 5460076 | Fluid-operated brake actuator with internal check valve A fluid-operated brake actuator having a check valve in the spring chamber to equalize the pressure on opposite sides of an operating movable diaphragm. The brake actuator comprises a service brake housing divided into first and second service chambers by... | 10/24/1995 |
| 5429036 | Remote hydraulic pressure intensifier A double acting reciprocating intensifier uses a single low pressure fluid stream as both the power supply and the source of fluid the pressure of which is to be intensified. The entire device, including flow paths, is confined within a compact cylindrica... | 07/04/1995 |
| 5425305 | Hydraulic cylinder piston with center flow bypass valve A relief valve for a hydraulic piston consists of a tubular mid-section with closed ends and circular stops at each end. The tubular center section has cross ports at each end that run perpendicularly to the axis of the valve. The cross parts are situated... | 06/20/1995 |
| 5421244 | Segmented flow-through piston for use in a torpedo launching system An ejection pump apparatus of a torpedo launching system is provided with improved water piston which is more stable during use and which enables the intake end of the water cylinder and the sea valve to have a smaller diameter than that of the piston. I... | 06/06/1995 |
| 5405407 | Cylinder for artificial leg In an artificial leg for a person having an upper thigh cut and a knee joint lost, a cylinder disposed between upper and lower leg members, which are coupled through a pivotable joint, for controlling bending and straightening of the joint by an air cushi... | 04/11/1995 |
| 5403164 | Air compressor for internal combustion two cycle engines A passive compressor is disclosed which includes a free piston or a flexible membrane whose movement is controlled by pressure variations in a main chamber. The pressure in the main chamber changes according to the pressure in the motor crankcase, as the ... | 04/04/1995 |
| 5341723 | Reciprocating pneumatic motor for hydraulics A reciprocating pneumatic motor for hydraulics has a pair of guide grooves on the inner wall of a cylinder provided, together with a pneumatic piston and a shuttle valve to function pneumatically. The piston has a seal ring which passes the guide grooves ... | 08/30/1994 |
| 5318139 | Reduced waiting time hydraulic drilling jar A reduce waiting time drilling jar 1 includes a mandrel 2, a housing 3 telescopingly positioned about the mandrel 2, and first and second pistons 89, 111 positioned axially between the mandrel 2 and the housing 3. The pistons 89, 111 are spaced longitudin... | 06/07/1994 |
| 5275085 | Control device for pneumatic cylinder A device for controlling a pneumatic cylinder device, being of a double cylinder construction comprising an outer cylinder and an inner cylinder sealably fitted in the outer cylinder to slide along the outer cylinder. In the inner cylinder, a piston with ... | 01/04/1994 |
| 5261311 | Reciprocating hydraulic motor with a differential piston The invention relates to a reciprocating hydraulic motor having a differential piston interposed between an inlet pipe for fluid at a pressure P1 and an exhaust pipe for fluid at a pressure P2 which is less than the pressure P1 The moving assembly constit... | 11/16/1993 |
| 5259294 | Shock-absorbing piston made up of dissimilar joined parts, blank for the piston and method for manufacturing the piston A shock-absorbing piston, a blank for the piston and a method for producing the piston include two parts being constructed radially symmetrically, but formed with outer and inner parts differing from each other. This offers great variability in the shapin... | 11/09/1993 |
| 5243897 | Magnetically actuated fluid motor A magnetically actuated fluid motor has a shiftable member having valve members for alternately closing one and opening the other of large and smaller faces of a stepped piston reciprocating in a housing. The shiftable member carries a magnet and is shift... | 09/14/1993 |
| 5228378 | Force applicator A force applicator comprises a ram operable by fluid under pressure. A pressure pad (7) is located between one movable part of the ram (3) and the load (9) and means are provided which enable relative movement to take place between the pressure pad and th... | 07/20/1993 |
| 5178305 | Dispensing cartridge with storage cylinder and dispensing piston having a closure sealed vent bore The dispensing cartridge comprises a storage cylinder and a dispensing piston whose bottom surface is progressively recessed from the piston edge towards an aeration bore. An overflow chamber is disposed around said aeration bore, overflow slots being pro... | 01/12/1993 |
| 5129311 | Piston assembly with primary and co-centric secondary portions A piston assembly comprising a primary piston and a co-centric secondary piston. The pistons are received within a housing for reciprocating movement therein and relative to each other. The housing and the pistons are arranged for operating pressure to be... | 07/14/1992 |
| 5031664 | Pressure fluid reservoir for vehicle brake systems A pressure fluid reservoir having at least an approximately vertically disposed cylinder with a displaceably guided divider piston therein. The piston divides a pressure fluid reservoir chamber of the cylinder, located below the piston from a gas chamber ... | 07/16/1991 |
| 4915186 | Hydraulic steering systems dampening devices The present invention is directed to a mechanical hydraulic pressure dampening devices for use in a steering system of an articulated self-propelled work vehicle. The dampening devices are hydraulically positioned between the steering cylinders of the wor... | 04/10/1990 |
| 4821624 | Stroke limiter for hydraulic cylinder A stroke limiter for a hydraulic cylinder comprises two sleeve portions each having a channel located therein that are frictionally mounted to the piston rod adjacent to the piston. An elongated contactor is slidably received in each of the channels. The ... | 04/18/1989 |
