Class 277/449 - Particular piston seat

Subclass of Class 277 - Seal for a joint or juncture
Definition: Seat therefor wherein the part (i.e., a piston) has more
No. of patents: 39
Last issue date: 07/08/2008

Number	Title	Issue Date
7396018	Oil scraper ring for pistons of internal combustion engines The invention relates to an oil scraper ring for pistons of internal combustion engines. The oil scraper ring comprises a disc that is provided with parallel flanks and a bearing surface having an asymmetrical crowned form with a vertex line extending over the perip...	07/08/2008
7306232	Multipart oil wiping ring for pistons of internal combustion engines A multipart oil wiping ring for pistons of internal combustion engines comprises two steel strip-type lamellae with parallel sides, the running surfaces of which are provided with a convexly asymmetric shape having a vertex line that extends across the circumference...	12/11/2007
7261301	Oil scraper ring for pistons of internal combustion engines The invention relates to an oil scraper ring for pistons of internal combustion engines, said oil scraper ring comprising a disc (1) provided with a bearing surface (h) having an asymmetrical crowned form with a vertex line (3) extending over the perip...	08/28/2007
7044473	Piston and piston ring assembly Two seal rings are provided comprising an upper ring and a lower ring, the rings having a common axis, a common outer cylindrical surface, a common inner cylindrical surface, and a couple of facing surfaces. The facing surfaces form an engaging length in a radial se...	05/16/2006
7017916	Shaft seal assembly and its associated method of manufacture A system and method of manufacturing improved wear ring assemblies and positive pressure shaft seals. The wear ring assemblies are made from stacked layers of flat metal. Different shaped component parts of the wear ring assemblies are cut from various sheets of met...	03/28/2006
6682078	Ring groove for oil ring with coil expander of piston A ring groove for a two-piece oil ring of a piston is provided that has ring body equipped with a coil expander, wherein the ring body has an upper outer surface and a lower outer surface, both orthogonal to the axial direction of the piston. The ring gro...	01/27/2004
6547251	Ring groove for oil ring with coil expander of piston A ring groove for a two-piece oil ring of a piston is provided that has ring body equipped with a coil expander, wherein the ring body has an upper outer surface and a lower outer surface, both orthogonal to the axial direction of the piston. The ring gro...	04/15/2003
5664536	Self-locating piston ring for a two-stroke engine A self-locating piston ring for a piston of a two-stroke engine. The piston is slidable in the cylinder bore of a two-stroke engine and is provided with a circumferential groove. A recess extends radially inward from a portion of the groove. A split pisto...	09/09/1997
5651553	Antirotation structure for combined oil ring A combined oil ring comprises an oil ring and a coil expander. A curved bar passes through paired end portions of the coil expander. An antirotation member comprises a portion to be inserted into a hole and a portion to be held. Two mutually parallel surf...	07/29/1997
5611260	Piston ring mount structure A piston ring of Teflon (trademark of E.I du Pont de Nemours & Co, Ltd.), i.e., polytetrafluorethylene fiber, is mounted on a piston. The piston ring has an integral portion in the form of a series of axially spaced circumferential projections received in...	03/18/1997
5377580	Piston with an encompassing seal In a piston with an encompassing seal, which is seated slidably in a cylindrical receiving bore of a structural part such as a housing block and which can be acted upon by pressure on at least one end, the piston is intended to have a shoulder for receivi...	01/03/1995
5267505	Piston A piston having a crown, a head land depending downwardly from the crown, a skirt and at least one groove between the head land and the skirt to receive a piston ring wherein the head land is provided with a part which has a greater cross-sectional dimens...	12/07/1993
5222879	Contact-less seal and method for making same A contact-less seal apparatus including a first surface and a closely adjacent second surface with a space defined therebetween. A high pressure fluid region exists on a first side of the space. A low pressure fluid region exists on a second side of the s...	06/29/1993
5140905	Stabilizing gas bearing in free piston machines In a free piston engine, to reduce dynamic loads on the reciprocating elements caused by a time varying pressure gradient across the gas bearing and close clearance seals provided therein, drain galleries are incorporated at the ends of the gas bearings t...	08/25/1992
5083536	Compression piston ring groove for an internal combustion engine An internal combustion engine including a head (29), a cylinder block (20) containing a cylindrical bore (22) and a piston (27). The piston (27) is located within the cylinder bore (22) of the cylinder block (20) for reciprocating motion in the longitudin...	01/28/1992
5076150	Piston assembly with wear resistant piston ring lands The Assembly comprises a piston body having a longitudinal axis to which are added, in interlayered fashion, separate, piston-ring lands and spacers. In one embodiment, a pair of rider rings are coupled to the piston body, in spaced apart locations, to gu...	12/31/1991
4875405	Sealing device A sealing device particularly suitable for sealing pistons of working cylinders and for sealing two machine components which can slide against one another is disclosed. A conventional sealing element consisting of low-friction, but not very elastic materi...	10/24/1989
4850829	Transmission pump with improved seal A transmission pump has a cylindrical body sized to fit in a bore in the transmission housing. Inlets and outlets are circumferentially spaced on the cylindrical body. Convoluted ring type seals are arranged on the outer surface of the body in order to al...	07/25/1989
4678010	Accumulator for airless spraying apparatus A gas-liquid piston accumulator having improved piston lubrication by providing a plurality of blind hole lubricating passages around the periphery of the piston....	07/07/1987
4572520	Multi-component steel piston ring with rotation preventing rivet A piston ring for control of the oil on a cylinder wall that is comprised of thin upper and lower ring members disposed to contact the cylinder wall and an intermediate corrugated expander-spacer. The upper ring member has a headed rivet with the upper he...	02/25/1986
4559781	Master cylinder A master cylinder includes a housing with a pair of pistons movable therein to develop fluid pressure in a pair of pressure chambers. One of the pistons carries a seal assembly in order to provide a fast-fill feature. The seal assembly engages a large dia...	12/24/1985
4516480	Piston ring for endothermic motors having an improved flame damper ring The piston has at least one first piston ring groove for receiving a first compression ring and a flame damper ring groove located above said first compression ring for receiving a floating type flame damper ring. According to the invention, on the outer ...	05/14/1985
4509764	Sealing arrangement An hydraulically operated clutch release has an annular piston hydraulically moveable in an annular chamber. A felt ring is mounted on a shoulder of the piston away from the chamber, to engage the bore surface of the chamber, and a holding ring is snapped...	04/09/1985
4496161	Radially extensible joint packing with O-ring An O-ring assembly with a generally piston-like shape elastomeric body that is radially extensible and has a circumferential groove which retains a circumferentially extensible O-ring....	01/29/1985
4474106	Fluidic self adjusting seal assembly A fluidic bearing seal assembly comprised of a plurality of floating back ring seals positioned in a plurality of annular grooves in a piston with at least one free-floating sealing wedge fitted to the outer peripheral edge of each backing ring for slidi...	10/02/1984
4466624	Sealing arrangement The disclosed arrangement is for sealing between two cylindrical bodies with an annular gasket ring in such a way that the seal is established only under conditions of a predetermined fluid pressure, so that at a lower pressure a flow is permitted across ...	08/21/1984
4428276	O-Ring seal for piston of double-acting fluid pressure cylinder A double-acting pneumatic cylinder has a housing with a cylindrical chamber therein. A cylindrical piston is supported coaxially in the chamber for movement axially thereof and has a circumferential groove in the outer surface thereof. A pair of spaced, f...	01/31/1984
4403922	Seal gland improvements for hydraulically actuated downhole pumps An improved seal assembly for sealing the annulus between a free-type downhole hydraulically actuated pump and the pump cavity within which the pump is telescopingly received downhole in a borehole. A connector body is affixed to the upper end of the pump...	09/13/1983
4362136	Internal combustion engine piston A piston for medium-speed internal combustion engines having a ring groove for receiving a compression piston ring. The upper and lower flanks of the ring groove when the engine is cold deviate from a plane-parallel position in relation to the adjoining u...	12/07/1982
4355519	Split ring seal for cryogenic refrigerator A cryogenic refrigerator has a split seal at the interface between a displacer and cylinder. An expander ring presses the seal ring against the cylinder. The seal ring is also axially loaded against one face of a groove in which it is positioned. Preferre...	10/26/1982
4304410	Sealing structure for reciprocating pistons exposed to high pressure differentials This invention effects a significant reduction in leakage along a piston reciprocating in a cylinder and having a high fluid pressure differential existing between one end of the piston and the other. A large number of closely spaced, annular grooves are ...	12/08/1981
4280601	Shock absorber with improved piston compression valve mechanism An improved piston compression valve mechanism for a double acting shock absorber which includes an upwardly facing annular valve seat on the piston. A washer member is fixed to the piston above the valve seat. The exterior periphery of the piston between...	07/28/1981
4244192	Refrigeration system and reciprocating compressor therefor with pressure stabilizing seal A Stirling refrigeration system includes a compressor having a piston which reciprocates within a cylinder. The piston compresses and expands a working volume of gas to cause sinusoidal variations in gas pressure in a cold finger unit. The mean pressure i...	01/13/1981
4147274	Floating roof tank seal A rim seal is provided for a floating roof tank to fill the space between the floating roof and circumferential wall of the tank. The seal is a compressible toroid of approximately the diameter of the tank and has a cross-sectional diameter greater than t...	04/03/1979
4072088	Light-weight piston assemblies A light weight piston assembly including a piston body formed of a light-weight metal and having a crown and a depending skirt, an annular recess about the end of the body adjacent the crown and opening toward the crown, the portion of the recess immediat...	02/07/1978
4050360	Oil damped piston An improved oil damped piston for use in internal combustion engines, pumps, compressors, or the like. The piston includes a generally cylindrical piston body having a crown and a depending skirt. A pair of spaced bands of polytetrafluoroethylene are carr...	09/27/1977
4026197	Oil cooled piston rings An improved reciprocating engine wherein the pistons are provided with hollow compression rings having a fluid inlet and a fluid outlet and an elongated fluid flow path extending therebetween. A path is established through various parts of the engine incl...	05/31/1977
4004443	Dynamic sealing device for high-temperature and high-pressure operation A pressure-tight assembly which can constitute a dummy block for an extension ram is made up of two coaxial components arranged in spaced relation to accommodate at least one peripheral seal. One component has a small flat bearing surface extending at rig...	01/25/1977
3982471	Seal in pump piston intermittently permitting conduction of pump fluid An improvement in liquid pumps having a piston with a packing surface which reciprocates in contact with a cylinder, comprising means for increasing the life of the packing by transmitting thereto a small portion of the liquid being pumped, for absorption...	09/28/1976

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Class 277/449 - Particular piston seat