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| Number | Title | Issue Date |
| 7290481 | Oscillating type compressor A lip ring is attached to a piston so as to be rotatable relative to the piston in a circumferential direction, and a seal portion is provided between a ring attachment groove of the piston and an attachment portion of the lip ring. During a suction stroke, the lip ... | 11/06/2007 |
| 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 |
| 7166089 | Plunger of a syringe A plunger of a syringe includes a shank partially movably received in a barrel of the syringe. The shank includes a first end having a thumb rest radially extending therefrom and a second end having a stub longitudinally extending from the shank. The stub includes a... | 01/23/2007 |
| 7131454 | Piston sealing mechanism for liquid additive injection pump A system for injecting a predetermined amount of a secondary fluid into a primary fluid stream uses a liquid additive injection pump driven by a fluid powered motor driven by the primary fluid stream. The liquid additive pump has a reciprocating piston movable withi... | 11/07/2006 |
| 7011010 | Free piston device with time varying clearance seal A free piston device which is particularly applicable for use with a linear motor for providing acoustic energy to a cryocooler for generating refrigeration at cryogenic temperatures which comprises a time varying clearance seal to counteract piston drift. ... | 03/14/2006 |
| 6957605 | High pressure pump piston A high pressure piston for use within a liner for a reciprocating pump comprises an elastomeric seal and a metallic annular bearing ring having relatively high heat conductivity compared to the liner and seal. During the pump's pressure stroke a portion of the beari... | 10/25/2005 |
| 6796217 | Injector assembly capable of preventing subsequent dripping, as well as plunger and seal member for the injector assembly A plunger for being inserted in a tubular barrel in an axially movable manner includes a plunger body having a distal end positioned within the barrel and a proximal end positioned outside of the barrel, and a seal member disposed on the distal end of the plunger bo... | 09/28/2004 |
| 6609454 | Piston with seal A method of forming a floating piston includes fabricating a piston cup, wherein the piston cup includes a top, a sidewall void of any seal-gripping irregularities, and an open end, and forming an elastomer seal over the sidewall of the piston cup. A floa... | 08/26/2003 |
| 6349630 | Wobble piston and seal assembly for oil free compressor The present invention is directed to a wobble piston and seal assembly for an oil free compressor. An upwardly directed curvature is provided on a piston surface which supports the seal. The curvature is located adjacent the perimeter of the surface to im... | 02/26/2002 |
| 6213000 | Wobble piston and seal assembly for oil free compressor An improved wobble piston and seal assembly for an oil free air compressor. The piston has a seal support surface which is provided with an upwardly directed curve adjacent its perimeter. A flat annular seal is secured to the piston to be supported by the... | 04/10/2001 |
| 6135008 | Piston with lubricant-scraping ring and lubricant return ports A piston assembly including a piston having a work surface, a sidewall extending from the work surface, and ports in the sidewall. The piston assembly also includes a flexible lubricant-scraping ring clamped to the piston between the work surface and the ... | 10/24/2000 |
| 5996472 | Cryogenic reciprocating pump A novel reciprocating pump for cryogenic fluids. The pump has a cylinder sleeve, head, intake valve, discharge valve, and a reciprocating piston including a mechanical spring energized seal having a generally U-shaped jacket and a helical spring in the bi... | 12/07/1999 |
| 5960700 | Replaceable mud pump piston seal A piston head assembly for reciprocating in a cylinder is disclosed, the cylinder having an inside surface and the inside surface having an inside diameter, comprising: a piston head including a central portion and a flange, the flange having a diameter t... | 10/05/1999 |
| 5941162 | Piston A piston having a body member made from plastic material adapted for mounting to a piston rod for axial movement with the piston rod in a hydraulic cylinder under high working pressure conditions is disclosed. The plastic piston body member has a first ax... | 08/24/1999 |
| 5916349 | Piston assembly and method for reducing the temperature of a compressor cup seal A piston assembly comprising a piston sleeve having an interior wall, a piston carried in the piston sleeve, a cup seal carried by the piston which engages the interior wall of the piston sleeve, and a valve plate matingly adapted to receive the piston sl... | 06/29/1999 |
| 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 |
| 5735188 | External slave cylinder for hydraulic clutch release system An external slave cylinder particularly suited for use in a hydraulic clutch release system for a motor vehicle. The cylinder includes a cylindrical body defining a bore, a piston slidably mounted in the bore, a seal positioned between the piston and the ... | 04/07/1998 |
| 5211099 | Slave cylinder for a hydraulic actuating system of a motor vehicle friction clutch A slave cylinder of the annular cylinder type is proposed, whereof the annular piston (45) able to slide axially between an outer cylinder wall (29) and an inner cylinder wall (33) is sealed by a grooved sealing ring (53) with respect to the pressure cham... | 05/18/1993 |
| 5193433 | Piston sealing and dampening device Piston sealing and dampening device in a pressurized-fluid cylinder, where a piston (3) has a central recess (3a) facing towards a cylinder end cap (1a) and disposed such that when the piston is in the vicinity of its end position, said recess accommodate... | 03/16/1993 |
| 5174192 | Piston, method of making the piston and piston and cylinder unit comprising the piston A piston for a door closer comprises metal cups on opposite ends of a stem. A plastics ring is a snap-fit in one of the cups and protrudes from that cup to seal against the wall of a cylinder. A groove in the side wall of the cup for receiving a rib on th... | 12/29/1992 |
| 5092125 | Seal An annular elastomeric seal, a piston utilizing the seal, and a fluid cylinder assembly utilizing the seal. The seal includes an axially forward portion defining a circumferentially inner and a circumferentially outer deflectable lip seal and an axially r... | 03/03/1992 |
| 5058487 | Cylinder with radially movable rod A cylinder having a radially movable or pivoting rod slidably received in a floating gland disposed in a cavity or recess in an end cap of the cylinder. Preferably, seals are provided between the rod, gland and recess. Hence, the rod and gland can move ra... | 10/22/1991 |
| 5046931 | Radial gear driven piston pump The radial gear driven piston pump (10) comprises a stationary pintle or pin (40) having a rotatable rotor (30) mounted thereon. The rotor (30) and pintle (40) are disposed within a pumping bore (18) that is eccentrically aligned relative to bore extensio... | 09/10/1991 |
| 5022312 | Plastic piston head assembly A piston having a cup seal retainer assembly wherein the cup seal is secured between an underside of a circumferential flange of the piston and a retainer ring that is secured to the underside of the piston.... | 06/11/1991 |
| 5014599 | Two piece hydraulic piston assembly with swaged piston-sleeve joint A piston and piston support rod assembly in which the piston is formed as a sheet metal stamping. A central sleeve is attached to the end wall of the stamped piston by a swaging operation performed on an annular section of the end wall. An undercut area o... | 05/14/1991 |
| 4924759 | Press-fit retaining ring with extrusion-holding chamfer for wobble-piston cup seal A wobble piston apparatus incorporates a cup-type seal seated on a land formed about the head of the piston, and secured by an annular ring. The head of the piston and the ring have chamfered edges which facilitate an engagement of the ring with the pisto... | 05/15/1990 |
| 4892427 | Seal for a dosage dispenser tube A dispenser for dispensing metered amounts of a viscous material includes a rigid tube which defines a compartment for the material, a discharge passage at one end of the tube, a push button activated and reciprocatingly movable rod which moves back and f... | 01/09/1990 |
| 4832583 | Low pressure metering fluid pump A low pressure metering pump having a hollow piston reciprocated in a cylindrical guide by a solenoid coil. A pair of check valves provide for unidirectional fluid flow through the cylindrical guide in response to the reciprocation of the piston. A seal a... | 05/23/1989 |
| 4813343 | Ringless piston construction An improved ringless piston construction having particular use in a closed fluid system. The piston includes a metal core, which is attached to a piston rod, and a resilient outer member is secured to the core and is formed from a material, such as nitril... | 03/21/1989 |
| 4694852 | Flow regulating valve for controlling the flow of corrosive fluids A fluid flow regulating valve for controlling the flow of a corrosive fluid, the valve including an axially unrestrained movement of the piston in accordance with the fluid flow varies the effective size of a flow control orifice to regulate the fluid flo... | 09/22/1987 |
| 4601235 | Reciprocating pump piston A reciprocating pump piston includes a piston rod which is adapted to be disposed within a cylinder. A piston hub is secured to the piston rod and is adapted to be reciprocated thereby within the cylinder. The hub includes a flange portion having a cylind... | 07/22/1986 |
| 4515378 | Double cup sealing member for double action piston pump A one-piece, self-lubricating, thermoplastic sealing member suitable for a double action piston pump, the sealing member comprising a tubular shaped body, a peripheral portion of which is radially cut into two flanges of substantially equal length and thi... | 05/07/1985 |
| 4444010 | Rotary power element A rotary power element for tensioning devices of safety mechanisms for protecting the occupants of vehicles by the use of safety belts has a rotatable drive mechanism, a compress-gas generator, and a tubular element between the drive mechanism and the com... | 04/24/1984 |
| 4418799 | Combined air reservoir/brake cylinder device A pneumatic brake cylinder device employs a pair of different sized fluid motors, the pressure chambers of which serve as air storage reservoirs. The cylinder of the larger fluid motor is formed by the main casting and contains a larger piston, while the ... | 12/06/1983 |
| 4196909 | Piston and sealing head therefor The invention pertains to the sealing of pistons for pressurizing, pumping and displacing aggressive liquids and organic solvents. The design includes the sealing head proper and its attachment to the piston. Owing to its shape and material it is made of,... | 04/08/1980 |
| 4120617 | Pump device for supplying fuel to a combustion engine Device for supplying fuel to the atomizer of a combustion engine comprises at least a pump to be connected with the atomizer having a piston-bounded pump chamber and an electromagnet for reciprocating said piston. Said device is improved, particularly with reg... | 10/17/1978 |
| 4042080 | Wheel cylinder piston construction A wheel cylinder piston made of powdered metal is provided with a through hole and a steel or powdered metal insert of hard metal received in and fills the hole. The hardened insert acts directly against a tang of the brake shoe, eliminating the need for ... | 08/16/1977 |
| 3940938 | Cup seal for a master brake cylinder A master brake cylinder comprises a spring biased piston reciprocally mounted in a bore defined in a housing thereof. A cup seal, disposed in the bore to abut the piston, comprises a flexible annular flange portion having a plurality of circumferentially ... | 03/02/1976 |
