Class 92/193 - With spring means for biasing side wall portion radially

Subclass of Class 92 - Expansible chamber devices
Definition: Apparatus in which the piston is provided with a side wall
No. of patents: 37
Last issue date: 06/21/2011

Number	Title	Issue Date
7963212	Combination of a piston and a piston ring A piston 1 contains multiple ring grooves 2, 3 on the outer circumference of the piston 1, and piston rings 4, 10 are mounted in the ring grooves 2, 3. The piston 1 contains oil path grooves 7, 9 extending respectivel...	06/21/2011
7314080	Slidable sleeve plunger An improved plunger lift mechanism comprises an internal hollow body having bypass orifices that, when exposed, allow fluid to pass through during plunger descent in a downhole tube to the bottom of a production well. A slidable sleeve slides along the hollow body t...	01/01/2008
7290602	Internal shock absorber bypass plunger A bypass plunger having one or more internal shock absorbing elements and a variety of bypass orifice options is disclosed. ...	11/06/2007
7178451	Piston for metering equipment used in the food and/or chemical and pharmaceutical industries in particular, with improved seal systems A piston designed for use in metering machines employed in the food, chemical and pharmaceutical industries. The piston preferably has a cylindrical body with an annular bead in an intermediate position, a cap made of material designed to form a seal against the cyl...	02/20/2007
7077402	Combined oil ring A combined oil ring 4 is comprised of an oil ring 5 having upper and lower rails 7 and 8, and an expander 6 for applying contact pressure radially outwards on the oil ring 5. The outer circumferential surface 11 of th...	07/18/2006
7000712	Bearing seal A seal assembly for a shaft supporting a rotary element comprises a sealing ring having an inner radial surface in contact with a seal surface of the shaft. The sealing ring comprising a disc shaped integral radial lip normal to the inner radial surface. A disc shap...	02/21/2006
6591737	Pad plunger assembly with interfitting keys and key ways on mandrel and pads A pad plunger assembly includes an elongated mandrel having a pair of opposite ends, at least one pad subassembly disposed about the mandrel and extending between the opposite ends thereof, a plurality of annular key ways and annular keys respectively def...	07/15/2003
6050235	Cylinder-piston assembly The present invention pertains to mechanical engineering, and more particularly to cylinder and piston assemblies mainly intended for use in two-stroke internal combustion engines. The cylindrical surface of the piston (5) is provided with recesses (9) lo...	04/18/2000
5655634	Shock absorbers and vibration dampers; and shock absorbers and vibration dampers with a piston with a piston ring; and a cyclinder with a piston with a piston ring A shock absorber with an affixed or clamped-on piston ring for a piston-cylinder unit, whereby the piston ring covers a lateral surface of the piston and creates a seal with respect to the cylinder, characterized by the fact that the piston ring has a wid...	08/12/1997
5618046	Piston ring assembly A piston ring assembly comprises a piston ring, a spring for providing an outward force on the ring, and a rail for engaging a cylinder wall. The piston ring is retained in a piston groove in a piston. During upward movement of the piston in a cylinder, o...	04/08/1997
5603512	Side and gap sealed oil ring An oil control ring assembly having a sealing ring and a scraping is disposed within a groove in a piston. The scraping ring assembly has a scraping end portion and spaced apart ends defining a gap. The sealing ring has a sealing end portion and mated spa...	02/18/1997
5507849	Individual cavity adjustment tong head assembly A tong head assembly for a glass blowing machine includes multiple tong mechanisms. Each tong mechanism has a tong extending from the bottom of a cylinder. The tongs are adapted to grasp a blown container. The cylinders are mounted for independent rectili...	04/16/1996
5303683	Piston with a profiled ring groove A piston with at least one compression ring, a top end and a longitudinally extending axis for an internal combustion engine. The piston includes at least one compression ring groove defined by first and second spaced lateral surfaces for receiving the at...	04/19/1994
5222429	Piston assembly for a hydraulic cylinder The fluid seals on the currently available piston assemblies are ineffective for blocking the leakage of electrical signals between the piston and the cylinder. The present invention utilizes an electrically conductive split ring seated in an annular groo...	06/29/1993
5147094	Substantially zero leakage path sealing assembly with insulating member This invention relates to a fluid sealing mechanism for the inside diameter and/or the outside diameter of a piston-cylinder arrangement. This device results in substantially zero seal leakage path with low differential seal pressure required using only o...	09/15/1992
5083499	Impact motor with improved sealing of a drive piston An impact motor comprises a housing (10) with a cylinder (11) therein, in which a reciprocating drive piston (40) via a gas cushion in a working chamber (44) of said cylinder (11) repeatedly drives a hammer piston (15) to impact on and to return from the ...	01/28/1992
5003863	Cylinder-piston unit for displacing a roll at right angles to its longitudinal axis Located in a stationary frame is a cylinder-piston unit, the piston of which is adapted to displace the bearing housing of a roll in a paper-making machine at right angles to the longitudinal axis thereof. The bearing housing is guided in the frame with t...	04/02/1991
5001965	Piston and piston ring Pistons and associated piston rings are described for use in internal combustion engines. The piston and piston ring comprise an annular piston ring groove having two radially extending walls and an axially extending wall; a compression ring received in t...	03/26/1991
4981070	Multi-part piston for servomotor A servomotor is actuated by a pressure medium and has a piston reciprocated in the cylinder, the piston being mounted by a piston rod that extends through a cylinder end wall. The piston has a piston member bearing against the cylinder and is mounted for ...	01/01/1991
4966068	Split ceramic piston ring arrangement with nested biasing ring A piston-ring arrangement for use in an internal combustion engine including a cylinder with a piston axially displaceable within the cylinder and at least one piston ring guided in the cylinder. The cylinder, piston and piston-ring are made of a ceramic ...	10/30/1990
4928577	Piston and cylinder unit It is a question of a piston and cylinder unit comprising a cylinder barrel defining a piston space, a piston able to run axially in said barrel with a support action due to a peripheral bearing surface of the barrel. The piston includes at least one annu...	05/29/1990
4926811	Internal combustion engines An internal combustion engine includes a piston mounted for reciprocating motion within a cylinder and sealed with respect thereto. The piston is connected to a crankshaft by means of a connecting rod, pivotal connections being provided between the connec...	05/22/1990
4890542	High-pressure-fluid machine, a seal The seal, for use especially in non-lubricated, high-pressure, as compressors, in a one-piece, continuous sleeve which envelopes a reciprocable piston for sealing against the piston, or against the cylinder in which the piston translates. One end of the s...	01/02/1990
4722507	Piston sealing ring apparatus A sealing ring device is provided for a fluid valve having a piston (2) reciprocating within a cylinder (1), wherein the piston (2) includes a valve cone (2c) adapted to contact a valve seat (11). In order to seal the inner space of the cylinder (1) locat...	02/02/1988
4693276	Pressure-balanced seals for vented accumulators The pressure accumulator (10) comprises a cylindrical housing (12) having a bore (14) with a piston received slidably therein. The piston (30) has an H-shaped cross section and includes a reduced diameter portion (34) extending longitudinally along the pi...	09/15/1987
4669369	Piston and piston ring assemblies A two ring piston and piston ring assembly has an upper thin steel compression ring and a lower ring which is thicker than the compression ring and which acts both as a compression ring and an oil control ring. The lower piston ring is made of a material ...	06/02/1987
4653339	Rack-and-pinion steering gear for a vehicle A rack-and-pinion steering gear structure for a vehicle including a rack housed within a cylinder driven by means of a pinion shaft, comprising: a bolt having a threaded portion screwed in a threaded hole formed in one end face of the rack and a shoulder ...	03/31/1987
4651628	Piston-cylinder arrangement of polygonal cross section A piston-cylinder arrangement, particularly useful for the press shoe of an extended nip press. The cylinder is a fluid pressure cylinder with a piston, which is fluid pressure reciprocated, disposed in the cylinder chamber. The cylinder and piston are po...	03/24/1987
4531891	Fluid bypass control for producing well plunger assembly The mandrel of a fluid lift plunger carries pads retracted from a tube string by the continuous bias of collapsing springs. A control rod is displaceable relative to the mandrel causing a change in the force of detent springs which exert a continuous radi...	07/30/1985
4466335	Sealing for variable volume device An improvement for a variable volume device in the form of a rectilinear case having disposed therein a rectilinear outer piston structure and a rectilinear inner piston structure within the outer piston structure, the inner piston being carried for rotat...	08/21/1984
4442759	Power booster unit The piston and cylinder of a hydraulic power booster are provided with opposed longitudinal grooves effecting a pocket for a series of rollers axially aligned and on an axis parallel to that of the piston-cylinder axis. A leaf spring in the piston groove ...	04/17/1984
4422294	Hydraulic actuating and locking device A hydraulic actuating and locking device includes a locking piston within a cylinder, an actuating piston within a cylinder in the rear surface of the locking piston and a pressure multiplier connected to the space behind the piston. A passage, constituti...	12/27/1983
4380273	Spur rack hydrosteering A piston assembly is mounted at an inner axial end of the toothed portion of a rack within a tubular extension of a hydrosteering gear housing. The piston assembly includes a piston ring floatingly supported with axial clearance on the base portion of a m...	04/19/1983
4275641	Hydraulic servo cylinder and piston A servo cylinder having a piston of the kind having spaced sections which move into an enlarged diameter low pressure bore portion of the cylinder is provided with a gasket assembly for each piston section in the form of an elastic sealing gasket having a...	06/30/1981
4244280	Piston for a pneumatic cylinder A piston for a pneumatic cylinder having a guide and sealing annular member extending around the circumference of the piston, and a resilient bearing member biassing the guide and sealing member in a direction for sealing engagement with the internal surf...	01/13/1981
4208953	Plunger for compressors A plunger comprises a carrier and a hollow sleeve portion extending around a portion of the carrier. The sleeve portion rests between longitudinally spaced radial shoulders of the carrier. A portion of the carrier disposed within the sleeve is radially sp...	06/24/1980
4122759	Jam-proof actuator structure An actuator, and a system employing the same, which will continue to operate after deformation of a portion thereof which deformation would normally restrict movement between the piston and cylinder of the actuator. The piston or gland of the actuator is ...	10/31/1978

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Class 92/193 - With spring means for biasing side wall portion radially