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| Number | Title | Issue Date |
| 7827903 | Fluid operated device with improved seal valve A seal valve arrangement is provided for a hydraulic device (10). The hydraulic device has an inner bore (14). The seal valve arrangement includes an element (45) disposed in the bore. The element is constructed and arranged to define a fluid pa... | 11/09/2010 |
| 7421939 | Combination of a chamber and a piston, a pump, a motor, a shock absorber and a transducer incorporating the combination A piston-chamber combination comprising an elongate chamber which is bounded by an inner chamber wall and comprising an elastically deformable piston comprising a container in said chamber to be sealingly movable relative to said chamber at least between first and s... | 09/09/2008 |
| 6957605 | High pressure pump piston A high pressure piston for use within a liner for a reciprocating pump comprises an elastomeric seal and a metallic annular bearing ring having relatively high heat conductivity compared to the liner and seal. During the pump's pressure stroke a portion of the beari... | 10/25/2005 |
| 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 |
| 5865091 | Piston assembly for stirling engine A piston assembly for a double-acting engine such as a double-acting Stirling engine. A pair of sealing rings located on opposite sides of a sealing washer are positioned between a base section and a dome section of a piston head. These sealing rings are ... | 02/02/1999 |
| 5449096 | Piston for a dispensing tool A piston (6) for a tool dispensing a mass from a foil bag (5) includes an axially extending piston rod (8) engageable with a central engagement part (14) of the piston and arranged to be pressed against the foil bag (5). A wipe-off edge (15) at least part... | 09/12/1995 |
| 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 |
| 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 |
| 5016524 | Sealing arrangement for a piston in a compressor A continuous seal ring member fitted in a ring groove of a piston of a compressor. The seal ring member has a washer-like initial shape with an internal diameter smaller than an outer diameter of the piston, whereby the inner peripheral portion of the sea... | 05/21/1991 |
| 4983105 | Down hole pump My invention is a down hole pump that operates on hydrostatic pressure. The mandrel is a tubular member having perforations therein. The expandable tube made of high quality plastic surrounds the hollow mandrel covering the perforations, thereby forming a... | 01/08/1991 |
| 4978102 | Aligning and seal ring retracting apparatus for plug type valve A valve plug assembly for use in a steam throttle valve includes a valve body and a removable guide ring attached to one end of the valve body. An outer edge portion is removed from the guide ring at the interface with the valve body so that a circumferen... | 12/18/1990 |
| 4893823 | Seal assembly A seal assembly is disclosed for installation in an annular groove having inner and outer radial surfaces interconnected by an axial surface. The seal assembly is comprised of a generally annular energizer element formed of an elastomeric material and inc... | 01/16/1990 |
| 4850826 | Suction pump with collapsible bellows A hand operated pump for liquids including dirty water and the like, which includes a cylindrical chamber having a foot valve at its lower end and reciprocal plunger including a rod mounted slidably in the upper end of the cylindrical chamber. The plunger... | 07/25/1989 |
| 4813343 | Ringless piston construction An improved ringless piston construction having particular use in a closed fluid system. The piston includes a metal core, which is attached to a piston rod, and a resilient outer member is secured to the core and is formed from a material, such as nitril... | 03/21/1989 |
| 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 |
| 4722507 | Piston sealing ring apparatus A sealing ring device is provided for a fluid valve having a piston (2) reciprocating within a cylinder (1), wherein the piston (2) includes a valve cone (2c) adapted to contact a valve seat (11). In order to seal the inner space of the cylinder (1) locat... | 02/02/1988 |
| 4711153 | Seal This invention provides a seal mechanism between two mating surfaces by means of a progressively, but not necessarily uniformly, decreasing clearance gap between said two surfaces for the flow of leakage of liquid and which gap may change as a function of... | 12/08/1987 |
| 4691621 | Piston-and-cylinder arrangement with radially-yieldable piston head An improved piston-and-cylinder arrangement has a pressure-balanced piston head mounted on an actuator rod. The piston head is mounted for axial movement with the rod, and for radial movement relative thereto. Three annular ring-type seals are provided be... | 09/08/1987 |
| 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 |
| 4651782 | Pressure-balanced seals for vented accumulators The pressure accumulator (10) comprises a cylindrical housing (12) having a bore (14) with a piston received slidably therein. The piston (30) has an H-shaped cross section and includes a reduced diameter portion (34) extending longitudinally along the pi... | 03/24/1987 |
| 4555223 | Radial piston machine In a radial piston machine, there is provided an outer stator and an inner rotor rotatable on a control pintle provided with supply and discharge channels. The rotor contains at least one radial bore in which is slidable a spherical piston comprising an o... | 11/26/1985 |
| 4531891 | Fluid bypass control for producing well plunger assembly The mandrel of a fluid lift plunger carries pads retracted from a tube string by the continuous bias of collapsing springs. A control rod is displaceable relative to the mandrel causing a change in the force of detent springs which exert a continuous radi... | 07/30/1985 |
| 4508019 | Reduced impact piston assembly A reduced impact piston assembly including a cylindrical body with a cavity formed therein and having a cross-bore formed therethrough which intersects the cavity. The cross-bore receives a piston pin which has an exposed intermediate portion aligned with... | 04/02/1985 |
| 4026524 | Fluid operated ram for felling trees A cylinder housing has a piston projecting from one end thereof for forming a longitudinally expandable ram. One end of the cylinder housing has a base and the projecting end of the piston has a head whereby upon engagement of the base of the cylinder and... | 05/31/1977 |
| 4022355 | Cartridge for containing and dispensing viscous material A cartridge for containing and dispensing caulking compound comprises an elongated tubular member, generally cylindrical in configuration, one end of which has a fixed end wall including a dispensing opening therethrough and a spout attached to the end wa... | 05/10/1977 |
