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| Number | Title | Issue Date |
| 7322272 | Piston and a power cylinder fitted therewith A piston for a fluid operated power cylinder has two mutually coaxial sealing lips axially extending away from each other and being able to radially yield, for sealing engagement with the piston running face of the power cylinder and adjacent to at least one piston ... | 01/29/2008 |
| 7140291 | Oil-free/oil-less air compressor with an improved seal An oil-free/oil-less air compressor with a piston positioned for reciprocating in a bore, the piston having a first piston ring assembly made from a rigid, high temperature polymer, and a second piston ring assembly comprising a first portion that engages the bore, ... | 11/28/2006 |
| 7108671 | Portable lumbar traction device A low-cost, light weight portable lumbar fraction device for home use by a patient including a support structure having a longitudinal axis and a carriage slidable along a portion of the support structure parallel to the longitudinal axis. The carriage includes a re... | 09/19/2006 |
| 6920819 | Uniform piston ring fill A piston and ring assembly for a compressor that may be used in a vehicle air conditioning system. The assembly comprises a piston and a ring located within a cylinder bore. The ring has a frustoconical shape and the piston has a complementary frustoconical groove. ... | 07/26/2005 |
| 6848354 | Unitary rod/piston assembly Preferred rod/piston assemblies (50, 50′, 150) comprise unitary rod members (52, 52′, 152) and compression rings (54, 54′, 154). In accordance with one preferred embodiment (50), the unitary rod member (52) comprises a connec... | 02/01/2005 |
| 6553892 | Mounting structure for piston packing A piston packing has a mounting surface and a seal surface. The seal surface and the mounting surface are fitted with a head and an annular groove portion, respectively, of a piston.... | 04/29/2003 |
| 6354820 | Pump For the purpose of providing a thin pump designed to decrease the number of parts, the pump is provided with a rectangular parallelepiped cylinder (3) and a piston located inside of the cylinder, wherein the piston (4) reciprocates and oscillates in the c... | 03/12/2002 |
| 6327963 | Piston or plunger and a method for making the same A piston or plunger is made by passing an annular sealing member blank around a piston body and by moving it towards a central outer cylindrical surface part of the piston body defined between first and second circular edges. The sealing member blank is d... | 12/11/2001 |
| 6305265 | Method and apparatus for pressurizing vaporous fluids Pump apparatus according to the present invention may comprise a pump body having a bore therein and a piston mounted within the bore so that the piston may be reciprocated within the bore between first and second positions. A sleeve seal assembly mounted... | 10/23/2001 |
| 6035634 | Compact, resistance regulated, multiple output hydraulic tool and seal valve arrangement A hydraulic device includes a housing and a bulkhead disposed in the housing. A pump piston is provided in the housing and has first and second end surfaces with the second end surface of the pump piston and surfaces of the housing and of the bulkhead def... | 03/14/2000 |
| 5884550 | Integral ring carbon-carbon piston An improved structure for a reciprocating internal combustion engine or compressor piston fabricated from carbon-carbon composite materials is disclosed. An integral ring carbon-carbon composite piston, disclosed herein, reduces the need for piston rings ... | 03/23/1999 |
| 5813313 | Piston for a fluid power cylinder A piston for a fluid power cylinder, which possesses two separate piston parts, which are detachably set together in a joint region axially with a sealing action. Each piston part has a rigid carrying element, which is molded on a holding portion, which i... | 09/29/1998 |
| 5794517 | Piston assembly A piston assembly that is movable back and forth parallel to its axis in a cylindrical housing, comprising a piston-like support part made of a hard material and a guide ring made of a polymer. The guide ring surrounds the support part along a portion of ... | 08/18/1998 |
| 5746112 | Piston for tank In an elongate tank for transport or for storage in bulk of semisolid and fluid material such as grease and oil. The tank has an outlet at one end thereof for discharging material contained therein and is of generally cylindric internal cross section. It ... | 05/05/1998 |
| 5735188 | External slave cylinder for hydraulic clutch release system An external slave cylinder particularly suited for use in a hydraulic clutch release system for a motor vehicle. The cylinder includes a cylindrical body defining a bore, a piston slidably mounted in the bore, a seal positioned between the piston and the ... | 04/07/1998 |
| 5520092 | Piston of shock absorber A piston for a shock absorber as may be used in an automobile comprises a piston body, and a piston ring which covers the outer periphery thereof. One end of the piston ring is formed as a bend, which is received in a first receiving groove formed in the ... | 05/28/1996 |
| 5363744 | Accumulator piston having multiple elastomeric seals An accumulator piston is formed as a two-piece plastic molding for simplifying its construction and for cost reduction and weight reduction purposes. The piston has a radially stepped construction in which each step includes a radial flange carrying an an... | 11/15/1994 |
| 5355775 | Pressure-transmitting hydraulic cylinder A potlike hydraulic cylinder consists of a cylinder pot (1), a piston (2), which constitutes a cover for the pot, a rubber-elastic plastic body (4), which occupies the pressure space between the cylinder pot (1) and the piston (2) and which forms a closed... | 10/18/1994 |
| 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 |
| 5347915 | Piston compressor for the oilfree compression of gases The piston (6) guided in a cylinder (1) has at least one split so-called trapped piston ring (10) disposed in an annular groove on the piston. The circumferential face (12) of the ring remote from the inner face (11) of the cylinder bounds in the annular ... | 09/20/1994 |
| 5259294 | Shock-absorbing piston made up of dissimilar joined parts, blank for the piston and method for manufacturing the piston A shock-absorbing piston, a blank for the piston and a method for producing the piston include two parts being constructed radially symmetrically, but formed with outer and inner parts differing from each other. This offers great variability in the shapin... | 11/09/1993 |
| 5234335 | Hydraulically, pneumatically or mechanically driven power unit A hydraulic or pneumatic power unit (1) includes at least one elastomer space (4) for a compressive-force producing/transmitting elastomer (5), the space (4) being formed so as to provide the space (4) with at least one constriction point between pressuri... | 08/10/1993 |
| 5222466 | Internal combustion engine with flexible/piston cylinder A system for harnassing the combustion of a fuel and an oxidizer includes a base that has valved ports as inlets for the fuel and oxidizer and an outlet for the combustion products. The combustion occurs in a flexible container, preferably a thin walled m... | 06/29/1993 |
| 5199114 | Drain clearing device A drain clearing device having a transparent and hollow cylindrical body, a piston plunger assembly partially disposed in the cylindrical body, piston plunger assembly support attached to an upper end of the cylindrical body, and a drain seal attached to ... | 04/06/1993 |
| 5154109 | Composite piston assembly A method of manufacturing a piston for transferring an output force to another member in response to pressurized fluid being communicated to a bore in a housing. The piston has a cylinder body made of a plurality of triaxial braided layers of carbon fiber... | 10/13/1992 |
| 5094148 | Piston stem insert for a carpule based piston A piston stem insert to be received within a hollow receptacle that is molded at the interior of a carpule based piston, so that a piston stem may be easily attached to and detached from the piston by way of the insert. In a first embodiment of the invent... | 03/10/1992 |
| 5092496 | Dispenser for flowable materials having a piston with a flexible sealing rim A dispenser for flowable materials, such as toothpaste, includes a hollow barrel in the form of a tube open at its lower end and closed at its upper end with the flowable material being inserted in the tube. A plunger which is also in the form of a hollow... | 03/03/1992 |
| 4944215 | Fluid actuated cylinder assembly with a floating cylinder head A fluid actuated cylinder assembly including a piston and piston rod and having a cylinder head capable of shifting in any direction throughout 360° along a plane perpendicular to the long axis of the cylinder. The piston and piston rod are rockable thro... | 07/31/1990 |
| 4909520 | Seal A shaft or piston seal for preventing unidirection fluid flow between two concentric mating members has an annular body in the form of a ring-like member with a polygonal profile in right cross section having innermost and outermost radial portions. One o... | 03/20/1990 |
| 4898082 | Molded plastic air cylinder A plastic pneumatic cylinder has a cylinder housing, a piston within the housing, and a rod on which the piston is mounted. The cylinder is molded of a plastic synthetic resin and has a cylindrical bore of a predetermined diameter. The piston is molded in... | 02/06/1990 |
| 4885978 | Fluid-operated miniature engine Miniature engine operated by an expanding gaseous fluid, which comprises a cylinder (18), piston (20) and inlet valve (29), the upper part of the piston (20) cooperating with a radially expansible resilient diaphragm (28), which is secured to the piston (... | 12/12/1989 |
| 4800801 | Pump A swash plate pump includes a housing and cylinders arranged in a circular pattern around the drive shaft. Piston rods are pivotally connected at one end to the swash plate and mechanism surrounding the drive shaft and axially slidable along it controls t... | 01/31/1989 |
| 4779842 | Height-adjustable rubber pot bearing with an elastomer plate There is provided a height adjustable rubber pot bearing for supporting or lifting bridges. The pot bearing has an elastomer plate for transmitting and lifting or lowering loads wherein pressurized fluid is introduced between the bottom of the pot and the... | 10/25/1988 |
| 4743033 | Dynamic seal assembly for piston and cylinder operating in subterranean wells A dynamic seal for effecting the sealing of a piston which is axially movable in a cylinder bore comprising a primary sealing element formed of a non-elastomeric sealing material having a hub portion secured to the piston element and an outwardly flaring ... | 05/10/1988 |
| 4694734 | Sealing construction for slide type vacuum pump with finger portions of spring element pressing cylindrical portion of seal element against cylinder bore A slide type vacuum pump has a cylinder bore with a cylindrical piston reciprocatingly slidably fitted therein and defining a vacuum pumping chamber. A seal element is housed in an annular groove around the piston defined by a radially extending annular s... | 09/22/1987 |
| 4687182 | Height adjustable pot bearing A height adjustable pot bearing is provided having a pot, a steel cover plate and an elastic plate of substantially incompressible elastomeric material disposed in and completely filling the pressure chamber defined between the cover plate and the pot. A ... | 08/18/1987 |
| 4676143 | Piston seal device for reciprocating compressor A piston seal device for a reciprocating compressor, having a piston slidably mounted in a cylinder bore and having a circumferential groove, and a resilient piston ring fitted in the circumferential groove of the piston and sealingly engageable with the ... | 06/30/1987 |
| 4651623 | Work cylinder having a piston member with an integral cushioning arrangement A work cylinder having a piston of single-body construction and a cushioning arrangement integrally formed on the piston includes a cylinder housing having a chamber formed therein divided into first and second work chambers by the piston. First and secon... | 03/24/1987 |
| 4610195 | Piston for a hydraulic piston machine of the multiple displacement type A piston for a hydraulic piston machine in which a piston body receives a ball in a space defined at one end of thereof. A bearing dish supports the ball in the space with an O-ring engaging the recess to seal the bottom surface of the bearing dish. Prefe... | 09/09/1986 |
| 4596317 | Disc brake piston and brake pad assembly A planar body spring attaches the inboard shoe and lining assembly to the piston of a disc brake caliper. The spring also serves as a shield for the piston boot seal.... | 06/24/1986 |
