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| Number | Title | Issue Date |
| 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 |
| 7252292 | Oil ring for an internal combustion engine An oil ring for an internal combustion engine, comprising a metallic annular body (10) to be mounted around a piston (P) reciprocating inside a cylinder (C) of the engine, said annular body (10) having opposite lateral faces (11), an internal fa... | 08/07/2007 |
| 7083170 | Rod or piston primary seal A rod or piston primary seal, which includes a primary seal (2) facing the space (1) to be sealed and a secondary seal (3) facing away from it, in which the primary seal (2) is fitted into the groove (4), of a holding element (5... | 08/01/2006 |
| 6938879 | Valve seal with pressure relief channels and expansion voids A flexible, resilient incompressible seal for a butterfly valve is disclosed formed from a loop having a perimeter mounting surface and a perimeter sealing surface with first and second oppositely disposed axial surfaces extend between the perimeter sealing and moun... | 09/06/2005 |
| 6685193 | Self lubricating, non-sealing piston ring for an internal combustion fastener driving tool A non-sealing, lubricating piston ring for lubricating the cylinder wall of a piston housing in a combustion tool is disclosed. The lubricating piston ring is made from a lubricating material such as polytetrofluroethylene (PTFE). The shape of the PTFE ri... | 02/03/2004 |
| 6616426 | Airlift piston mechanism An airlift piston mechanism is disclosed to include a casing having a piston chamber, an air inlet, a check valve in the air inlet, and an air outlet, a link, a piton reciprocated by the link in the piston chamber, the piston having an air accumulation ch... | 09/09/2003 |
| 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 |
| 5295696 | Combined oil ring A combined oil ring is comprised of a steel oil ring having a generally I-shaped section consisting of upper and lower rails and a web connecting the both rails and a coil expander for forcing the oil ring outwardly. Each of the outer circumferential slid... | 03/22/1994 |
| 5169160 | Lubricating seal for pneumatic cylinder A lubricating seal construction for a pneumatic cylinder (10) includes a lubricating rod seal (40) and lubricating piston seals (27, 29). The rod seal includes a cavity (66) for holding a supply of viscous flowable lubricant. The piston seals include cavi... | 12/08/1992 |
| 4681326 | Gas lubricated piston ring assembly A piston ring assembly wherein a piston member operating within a cylinder is lubricated by means of gas rather than oil films or solid lubricants. One ring (located near the lower end of piston) or two rings (one located near the lower end and the other ... | 07/21/1987 |
| 4422649 | Stirling engine piston ring A piston ring design for a Stirling engine wherein the contact pressure between the piston and the cylinder is maintained at a uniform level, independent of engine conditions through a balancing of the pressure exerted upon the ring's surface and thereby ... | 12/27/1983 |
| 4136647 | Rotary device particularly useful as a rotary engine A rotary device particularly useful as a rotary engine comprises a cylinder having two (or more) pairs of axially displaceable pistons, the pistons of each pair being movable towards and away from each other to define an expansible and contractable chambe... | 01/30/1979 |
| 4132417 | Pressure responsive sealing means A sealing device such as a piston ring has an L shaped cross section with primary and secondary sealing surfaces held in contact. The device is mounted in a groove to dispose the primary sealing surface against two relatively movable members and the secon... | 01/02/1979 |
