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| Number | Title | Issue Date |
| 7421940 | Piston compressor, particularly hermetically enclosed refrigerant compressor The invention concerns a piston compressor, particularly a hermetically enclosed refrigerant compressor, with at least one cylinder a piston reciprocating in said cylinder, the piston being connected with a driving rod via a piston pin and having in its outer jacket... | 09/09/2008 |
| 7357067 | Spherical joint of a hydrostatic piston machine A hydrostatic piston machine having a cylinder block with several cylinders, in which are slidably mounted pistons in load engagement with a reaction member via transmission members, each transmission member is connected to at least one of the piston or the reaction... | 04/15/2008 |
| 7284526 | Ellipsoid roller bearing piston ring An improved piston ring suitable for use in an internal combustion engine is disclosed comprising a plurality of races sized to receive elongate rollers disposed around the circumference thereof. The elongate rollers may be shaped as a prolate ellipsoid or other rou... | 10/23/2007 |
| 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 |
| 7249556 | Compressor with fortified piston channel A compressor is disclosed generally comprising a cylinder head mounted to a cylinder block having a cooling chamber and a piston channel via a bolt. A piston is disposed in the piston channel and has a contact portion that contacts the channel wall, which is integra... | 07/31/2007 |
| 7246552 | Piston having asymmetrical pin bore slot placement A piston, having a first side subject to major thrust loading and a second side subject to minor thrust loading, is provided. The piston has a crown portion and a first and second pin boss portion depending therefrom. An axially extending pin bore is provided within... | 07/24/2007 |
| 7188841 | Secondary piston seal A secondary seal is provided for an internal combustion engine having a piston, cylinder bore, ring seal, secondary seal, and leak path. Forces are applied from the combustion side of the piston through a cylinder gap and a leak path to the secondary seal. The secon... | 03/13/2007 |
| 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 |
| 7134383 | Piston arrangement The invention concerns a piston arrangement having a piston with a piston head and a piston skirt with a circumferential surface, and a connecting rod, which is connected with the piston via a ball joint comprising a ball, and penetrated by an oil supply channel, wh... | 11/14/2006 |
| 7117783 | Reciprocable piston with a fluid scavenging system and method of scavenging a fluid A reciprocable piston comprises a cylindrical body reciprocable within a hollow cylinder and at least two spaced ring seals disposed around the circumference of the cylindrical body. Within the cylindrical body there is a scavenging system that comprises: an interna... | 10/10/2006 |
| 7100494 | Piston arrangement The invention concerns a piston arrangement having a piston with a piston head and a piston skirt and a connecting rod, which is connected with the piston via a ball joint arrangement comprising a ball, the ball being held in the piston by means of a safety element.... | 09/05/2006 |
| 6983682 | Method and device at a hydrodynamic pump piston A method and device for forming a sliding seal between a reciprocating piston (22) and the wall of a cylinder (8), wherein one side of the piston faces a first liquid in a pump chamber (26) of the cylinder (8), a first piston seal (24 | 01/10/2006 |
| 6941852 | Unitary hollowed piston with improved structural strength A unitary, “hollow out” piston is molded or forged with only two tools, which move along a single parting direction, with a pair of arcuate side walls that provide maximal outer surface area with minimal thickness and weight. The thin walls are internally fortif... | 09/13/2005 |
| 6935220 | Contoured piston A piston for use in internal combustion engines or reciprocating compressors such as those utilized in air-brake systems for heavy duty freight vehicles. The body of the piston of the present invention is contoured in manner to reduce the undesirable build-up of oil... | 08/30/2005 |
| 6928922 | Lubricating structure for hydraulic driving apparatus Seal sections, which support first and second piston rods, are provided on inner circumferential surfaces of first and second cover members of a cylinder mechanism. A lubricant is supplied via supply passages and oil supply ports to first oil-retaining members, whic... | 08/16/2005 |
| 6659229 | Pneumatic in-line lubricator An in-line lubricator for a pneumatic tool system includes a body defining a fluid reservoir and a working passageway and an actuator positionable within the body. The actuator includes an elongated body having a transfer cavity formed therein which is in... | 12/09/2003 |
| 6457561 | Viscous pumping system A viscous pumping system for lubricating a bearing, including a reservoir configured to store a lubricant, a housing connected to the reservoir and mounting the bearing, and a shaft disposed in the housing and supported by the bearing. The shaft is rotata... | 10/01/2002 |
| 6450297 | Hermetic compressor There is provided a hermetic compressor in which an oil hole is directly formed in an inner wall of a piston hole on which a lateral component force is exerted, thereby intensively performing a lubricating action at the portion which is susceptible to the... | 09/17/2002 |
| 6324961 | Oil passage arrangement in a piston Oil passages 12 for lubricating and cooling a piston pin 10 are provided in such a manner as to each open to an oil ring groove 5 of a piston 1 and to a piston inner side surface 2b of a piston pin supporting part 2 at portions in the vicinity of an upper... | 12/04/2001 |
| 6321635 | Swash plate type compressor in which lubricating oil is effectively supplied to a shoe mechanism interposed between a piston and a swash plate In a swash plate type compressor in which a shoe mechanism (23a and 23b) is slidably interposed between a swash plate (21) and a piston (22) to convert a rotating motion of the swash plate to a reciprocating motion of the piston, lubricating oil is effect... | 11/27/2001 |
| 6321951 | Dispensing apparatus A dispensing apparatus for dispensing a product from a container under pressure of a propellant by means of a composite piston (138). The apparatus has a valve (104) operated by means of an actuator (108) and a lever (166). The actuator co-operates with t... | 11/27/2001 |
| 6216584 | Piston having an improved barrel portion, and a compressor using the same For being slidably inserted into a cylinder bore defined by a cylindrical surface extending in a predetermined direction, a piston (8) has a head portion (81) extending perpendicular to the predetermined direction and a barrel portion (82) connected to th... | 04/17/2001 |
| 6205908 | Piston equipped with piston ring The present invention aims at reducing the amount of oil consumption in a piston using a piston ring continuously formed of resin without being provided with an abutment. A stepped portion is formed on a third land, which is located below a second ring ha... | 03/27/2001 |
| 6152016 | Piston with cast passages A piston is formed with one or more recesses or depressions on its underside as it is cast, molded or forged. The recesses are located adjacent the outer cylindrical wall of the piston head so that when a groove such as an oil ring groove is subsequently ... | 11/28/2000 |
| 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 |
| 6099274 | Pump to surface pump A reciprocating pump is provided for pumping subterranean fluids containing fine solids to surface. The pump comprises a pump barrel, piston and piston rod. The piston rod is suspended form reciprocating production tubing. The barrel is anchored in the ca... | 08/08/2000 |
| 5839351 | Piston In this piston, oil grooves 5 are provided in the selected parts of a surface of a skirt portion 3 which are liable to encounter the breakage of an oil film, and which are on the thrust side and anti-thrust side, and not in the parts of the surface of the... | 11/24/1998 |
| 5806631 | Piston pin lubrication A number of embodiments of direct piston pin lubrication systems for reciprocating machines such as internal combustion engines. In all of the embodiments, the hollow interior of the piston pin is employed as a distribution passage with radial drillings e... | 09/15/1998 |
| 5701797 | Sealing system A piston reciprocally movable within a cylinder is sealed to the cylinder wall by fluid at a pressure greater than those of the fluids on the opposed sides of the piston supplied to the space (18) between two seals (19, 20) operative between the piston an... | 12/30/1997 |
| 5503861 | Method and apparatus for lubricating dough dividers A dough divider is provided having a piston and cylinder mechanism for repeatedly pressing dough into a measuring cup assembly. Dough is drawn from a hopper into the cylinder through a tube. A lubrication port is disposed in the tube, and a channel extend... | 04/02/1996 |
| 5490445 | Ultra low device volume piston system A piston and ring assembly operative within a cylindrical bore wall to retain pressurized fluid to one side of the assembly, the piston having a crown and an annular side wall for movement along the bore wall. The assembly comprises a piston having at lea... | 02/13/1996 |
| 5431087 | Extended stroke linear actuator assembly An array of symmetrically disposed piston-cylinder assemblies may be utilized to produce oppositely directed movements along a single force axis. Plumbing between the various cylinders may be external or internal, or a combination thereof, the exact form ... | 07/11/1995 |
| 5353691 | Self-lubricating piston for pharmaceutical container A compressible seal member is provided with peripherally distributed and axially spaced lubricant retaining grooves, or with radially extending lubricant channels in communication with a central lubricant reservoir. The sealing member has land portions an... | 10/11/1994 |
| 5314172 | High pressure die cylinder and manifold system A high pressure die cylinder and manifold system including a plurality of die cylinders mounted on a manifold. Each die cylinder includes a cylinder body in which a piston rod and a piston is positioned for limited relative movement with respect to the cy... | 05/24/1994 |
| 5313875 | Piston with support member and bearing A piston for an internal combustion engine has a crown and peripheral wall to carry a piston ring. A support extends between the wall and a bearing housing to receive the connecting rod. A cylindrical support member also extends from the wall around the s... | 05/24/1994 |
| 5201805 | Wear reducing piston for combustion engine The reduction of wear at the cylinder walls of combustion engines is achieved by a new type of piston with special channels and facilities for collecting lubricants and distributing the lubricants during the piston movement and especially during the first... | 04/13/1993 |
| 5174728 | Variable capacity swash plate type compressor A variable capacity swash plate type refrigerant compressor having a plurality of pistons each including a cylindrical hollow main body reciprocated in a cylinder bore of a cylinder block, and an engaging portion engaged with a swash plate. The cylindrica... | 12/29/1992 |
| 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 |
| 5072655 | Pistons for axial piston machines A piston for an axial piston machine, comprising a hollow body having an axial cavity into which a filler piece of a material of lower specific gravity than the material of the piston is inserted which at least partially fills said cavity, said filler pie... | 12/17/1991 |
| 4936269 | Method and apparatus for reduced oil consumption and oil deterioration in reciprocating engines A method and apparatus for reducing oil consumption and oil deterioration in a reciprocating engine. The engine is provided with ceramic rings and ceramic cylinder linings. Minimal oil lubricant is adsorbed on the surface layer of the rings and liners to ... | 06/26/1990 |
