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| Number | Title | Issue Date |
| 7429047 | Piston ring assembly A piston ring assembly includes an upper ring, a lower ring and an expander disposed between the upper and lower rings. When assembled, the piston ring assembly is positioned with a groove of a piston. During down stroke of the piston, the upper and lower rings radi... | 09/30/2008 |
| 7370866 | Sleeve element having a biasable end region, apparatus including same, and method of use A sleeve element having at least one end region configured to be biased into a laterally adjacent recess formed in one of a piston element surface and a bore surface is disclosed. A seal assembly is disclosed including two sleeve elements, each sleeve element having... | 05/13/2008 |
| 7311182 | Sealing and guiding packet To make a sealing and guiding packet available to shock dampers in order to minimize or even entirely prevent the negative effects of the so-called stick-slip effect and thus permit greater riding comfort, a sealing and guiding packet is proposed which comprises the... | 12/25/2007 |
| 7293496 | Hydraulic linear drive of a transmission actuator A hydraulic linear drive, in particular for a hydraulic transmission actuator, has a piston/cylinder unit in which an adjusting piston is situated so that it is longitudinally displaceable in a cylinder housing and divides a cylinder space into at least two pressure... | 11/13/2007 |
| 7210398 | Cover seals with latching locking features Seal apparatus includes a cover seal having a body and an extending cylindrical sleeve with the sleeve including a radial internal groove. A piston is provided having a circumferential groove and a biasing element is disposed between the internal and circumferential... | 05/01/2007 |
| 7165910 | Tube connection joint and method of forming same A connection joint (20) is described that is formed by inserting a plastic connector (10) into the end of a silicone tube (14). The connector includes a plurality of barbs (12). A reinforcing agent (16) is placed between each of th... | 01/23/2007 |
| 7134379 | Gas cylinder Disclosed is a gas cylinder, for improving sealing characteristics of the gas cylinder and improving convenience in manufacturing, including: a valve having a gas opening/closing pin at a through hole in its center, for intermittently passing a gas, and additionally... | 11/14/2006 |
| 7036823 | Side rail and combined oil control ring incorporated with the side rails for reduction of oil consumption A side rail is formed into a ring shape having its generally rectangular section that has an outer surface 3 formed with a pair of edge surfaces 5 of small radius, and an intermediate surface 6 of large radius of curvature formed between the edg... | 05/02/2006 |
| 7024866 | Axial loaded seal system with a static L-seal A piston includes a circumferential groove having a dynamic split seal ring having a flat axially facing surface, a static seal ring having a flat axially facing surface abutting the flat surface of the dynamic seal ring, and a spring mounted within the groove. The ... | 04/11/2006 |
| 6953195 | Sealing device A sealing device for a gap between two adjacent machine parts, including at least one inflatable, elastically stretchable tube, which is fitted into a groove in the sidewall of one of the machine parts, and which, when inflated, may, be positioned against a surface ... | 10/11/2005 |
| 6918595 | Seal for high-pressure pumping system A high-pressure pumping system including an energizing seal component having an aperture extending therethrough and a seal jacket component having a base and a toroidally-shaped flared membrane extending from the base. The body and the flared membrane are monolithic... | 07/19/2005 |
| 6860485 | Piston ring The present invention provides a piston ring comprising a piston ring main body and an expander ring arranged on an inner peripheral surface thereof, the expander ring comprising two oil expander rings, one of which is housed in a space in a spiral of the other. The... | 03/01/2005 |
| 6705616 | Piston ring device in internal combustion engine In order to increase in concentration of HC in an exhaust gas due to an axial gap between a ring groove and a piston ring, when an internal combustion engine is at a lower temperature, particularly, during the starting or the low-speed operation of the internal comb... | 03/16/2004 |
| 6575472 | System for sealing relatively movable elements The present invention is directed to a system for providing a fluid seal between relatively movable elements, including a hub or a drum and a piston. A groove for retaining a seal is defined in the periphery of one of the rotatable elements, and a spacer ... | 06/10/2003 |
| 6481336 | Piston with pressure-dependent sealing effect for a piston-cylinder arrangement, in particular a shock absorber piston The invention relates to a piston-cylinder arrangement, especially a shock absorber piston, comprising a piston body fitted with at least two peripheral webs on its peripheral surface, said webs limiting a groove and also including a collar-shaped sealing... | 11/19/2002 |
| 6340160 | System for sealing relatively movable elements The present invention is directed to a system for providing a fluid seal between relatively movable elements, including a hub or a drum and a piston. A groove for retaining a seal is defined in the periphery of one of the rotatable elements, and a spacer ... | 01/22/2002 |
| 6206248 | Dispensing piston for commodity container A piston for dispensing material from a commodity container includes a nose section connected to a piston shaft. A recessed channel is located between the nose section and piston shaft. In the channel, there is a seal lifter over which a solid wiping seal... | 03/27/2001 |
| 6199868 | Piston assembly with piston ring support and sealing member A piston ring assembly includes a piston, and at least one piston ring positioned within a piston groove. Stabilization and support of the piston is provided by a support arrangement, including at least one support member positioned radially between a bac... | 03/13/2001 |
| 5794941 | Piston ring assembly An improved piston ring assembly comprises a double-offset expander spring and a piston ring. The expander spring has a first wave portion that is continuously engaged in an annular groove of a piston body, the wave portion having an axial extent that is ... | 08/18/1998 |
| 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 |
| 5538256 | Method for producing a packing arrangement for a hydraulically operated apparatus and a packing arrangement The invention relates to a new method for producing a packing arrangement for a hydraulically operated apparatus. The method comprises the following steps: (a) producing a preshaped plastic piece of seal material; (b) compressing said preshaped piece at r... | 07/23/1996 |
| 5503375 | Coil spring with ends adapted for coupling without welding Spring apparatus is provided which includes coil springs having intermediate and end coils suitable for interconnection in order to form a continuous spring which maintains a constant load-deflection characteristic over all intermediate coils unaffected b... | 04/02/1996 |
| 5476268 | Seal assembly with a hard seal layer actuated through a silicone layer A seal assembly includes a body portion of an element to be sealed, a groove formed into the surface of the body portion, a seal member of a relatively hard material for sealing a gap formed between the surface of the body portion and another element to b... | 12/19/1995 |
| 5474307 | Piston ring employing elastomeric sealing member within the ring groove A piston head assembly has one, two or more grooves to receive piston rings. One or more of the grooves may receive multiple piston rings. A circumferential groove from the bottom of the elastomeric material allows oil pressure to aid in sealing. A novel ... | 12/12/1995 |
| 5470083 | Seal assembly with a hard seal layer actuated through a silicone layer A seal assembly includes a body portion of an element to be sealed, a groove formed into the surface of the body portion, a seal member of a relatively hard material for sealing a gap formed between the surface of the body portion and another element to b... | 11/28/1995 |
| 5380018 | Piston ring having a non-uniform radial pressure distribution A piston ring has a gap defined by ring gap faces oriented toward one another and a nominal outer radius assumed by the piston ring in a closed position in which the piston ring is in an installed state in an engine cylinder having a radius equalling the ... | 01/10/1995 |
| 5374168 | Reciprocating piston fluid pump A reciprocating piston fluid pump according to the present invention comprising: a pump driving section including a cam operated by an engine and a roller driven by the cam, the roller being provided at a lower end of a piston rod; a piston provided at an... | 12/20/1994 |
| 5372488 | Oil well pump with radially expandable interlocking seal ring Improvements in a downhole submerged pump assembly having a plunger formed of a cast or machined cylindrical member includes seal ring grooves capable of receiving flat metallic seal rings formed of a plurality of segments which are interlocked in a manne... | 12/13/1994 |
| 5361940 | Pump evacuation system for bulk containers of high viscosity fluids A ram assembly is designed for evacuating "bag-in-a-box" square bulk containers of viscous materials. The ram cylinder is centered over the bulk container and mounted so as to float relative to the frame allowing accomodation of various containers. An inf... | 11/08/1994 |
| 5341726 | Piston for tank An elongate tank for transport or for storage in bulk of semisolid and fluid materials, such as grease and oil. The tank has an outlet at one end thereof for discharging material contained therein, and has a generally cylindric interior surface. A general... | 08/30/1994 |
| 5265890 | Seal with spring energizer The seal apparatus includes a resilient member having at least one sealing surface thereon and an engagement surface spaced up from the sealing surface. A spring's position to bias the sealing surface and flexible or elastic means are disposed in and abou... | 11/30/1993 |
| 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 |
| 5163692 | One-piece composite lip seal A composite one-piece dynamic lip seal forms a dynamic ring seal between static and dynamic surfaces in a variety of applications requiring fluid sealing. The lip seal body is generally U-shaped in cross section and is principally made from a soft elastom... | 11/17/1992 |
| 5163823 | Reciprocating compressor having a cylinder provided with a gas passage A compressor includes a passage in the sidewall of the cylinder for directing compressed gas against circumferential surfaces of piston rings. The pressure of the gas from the passage counteracts the pressure of gas between the piston ring groove and the ... | 11/17/1992 |
| 5161806 | Spring-loaded, hollow, elliptical ring seal A canted-coil spring-loaded ring seal assembly including a plurality of coils having a major and a minor axis and canted along a center line defined by an intersection of the major and minor axes along with an elastic material, disposed around and between... | 11/10/1992 |
| 5159814 | Pneumatic impulse motor with gas cushion An impulse motor for a hand held hammer machine 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 i... | 11/03/1992 |
| 5140904 | Piston sealing arrangement for pressure-fluid-operated systems A piston sealing arrangement for pressure-fluid-operated systems is disposed in an annular recess of a piston (5) or an associated housing (4) and is composed of a sealing ring element (1A, 1B) as well as an elastic element (2, 3) acting on one side in op... | 08/25/1992 |
| 5114054 | Tank piston with teflon sheathed packing member An elongate cylindric tank for transport or for storage in bulk of semisolid and fluid materials, such as grease and oil with an outlet at one end thereof and a generally cylindric piston sized to slide therein and be moved in a direction toward the outle... | 05/19/1992 |
| 5113747 | High pressure piston sealing system and method of its assembly The present invention relates to a high pressure piston sealing system. More particularly, the present invention relates to a sealing system adopted for rigorous marine applications which prevent or inhibit the use of a seal lubricant.... | 05/19/1992 |
| 5079997 | Piston seal device for a pneumatic cylinder A piston seal device of pneumatic cylinder which satisfies the required tightness of a seal as well as the required lubrication characteristics for a piston movement is disclosed. The piston seal device for maintining different pressures acting on each si... | 01/14/1992 |
