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| Number | Title | Issue Date |
| 7353746 | Two-stage hand pump A hand pump for inflating rafts or similar inflatables has a first piston with a relatively low pumping volume which is capable of pumping relatively small volumes of air into a raft as the raft becomes full and is approaching its maximum pressure, and a second pist... | 04/08/2008 |
| 7284475 | Pneumatic reciprocating motor A gas-actuated reciprocal drive apparatus has a double-acting piston in a pneumatic cylinder having a chamber at each end. Gas from an area of higher pressure in a compressed gas system flows into a first chamber, while the second chamber is in fluid communication w... | 10/23/2007 |
| 7237471 | Continuously lockable adjustment device A continuously lockable adjustment device for immobilizing elements which are movable relative to each other includes a stepped cylinder having a first cylinder step and a second cylinder step, the second cylinder step having a larger cross-sectional area than the f... | 07/03/2007 |
| 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 |
| 7175154 | Piston structure and liquid feeder valve Piston structure having a first side and a second side and in a recess (6) formed in an outer portion of the piston (1, 22) a resilient sealing element (5, 11, 21) is placed. The axial width and at least in some places the radial depth of the re... | 02/13/2007 |
| 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 |
| 6671966 | Hydraulic and pneumatic actuated cutting apparatus A hydraulically and/or pneumatically actuated cutting tool is provided having a housing with a piston assembly slidably disposed between a fluid inlet and a fluid outlet. The piston assembly comprises a seal which is operable between two positions. In a f... | 01/06/2004 |
| 6299413 | Pump having a bleeding valve A pump comprises a housing having a fluid inlet and a fluid outlet. A piston is mounted for reciprocating motion in first and second directions within the housing. The housing has first and second cavities on first and second sides of the piston, respecti... | 10/09/2001 |
| 5715681 | Hydraulic master cylinder A hydraulic master cylinder having a cylinder body (1) with a piston (3) slidable therein. The piston carries a sealing assembly (20) to permit pressurization of a pressure chamber (6) and fluid recuperation upon retraction of the piston. The sealing asse... | 02/10/1998 |
| 5657681 | Hydraulic drive system The invention relates to a hydraulic drive system comprising a plurality of hydraulically driven piston units with cam rollers, which are disposed to act against a wave-shaped cam profile of a cam curve element, so that linear movement of the cam rollers ... | 08/19/1997 |
| 5421244 | Segmented flow-through piston for use in a torpedo launching system An ejection pump apparatus of a torpedo launching system is provided with improved water piston which is more stable during use and which enables the intake end of the water cylinder and the sea valve to have a smaller diameter than that of the piston. I... | 06/06/1995 |
| 5415135 | Four stroke continuous cycle radial piston engine An rotary internal combustion engine consisting of a rotatable cylinder made up of fuel charge and multiple working segments rotating in unison. The fuel charge and working segments each contain a plurality of radially arranged cylinders open at both ends... | 05/16/1995 |
| 5265565 | Reciprocating engine An engine (40) comprising a piston (2); a top ring (3) and a second ring (4) attached to the piston (2); partitioning members (9)(10) attached to the piston (2) and connecting the top ring (3) and the second ring (4) so as to form a gas chamber (8) at the... | 11/30/1993 |
| 5146838 | Piston apparatus for use in web pressing components in papermaking machinery A piston apparatus for use in a controlled deflection roll includes a rectilinear-shaped piston having at least one side seal extending longitudinally in a slot in each side wall and an end seal in each end of the piston extending between the side seals. ... | 09/15/1992 |
| 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 |
| 4922719 | Fluidic transformer with sealed cylinder and check valves in pistons An improved fluid transformer which is capable of controlling the position of the operating pistons within the apparatus so that pressure equilibrium is maintained and the movements of the pistons are limited to predetermined locations within the cylinder... | 05/08/1990 |
| 4771758 | Air weapon with air compression system having grooves for air transfer An air weapon air compression system of the type in which air is compressed in a cylinder and expelled through a discharge port, to propel a projectile along the barrel and fire it out of the weapon, by the rapid movement of a piston within the cylinder. ... | 09/20/1988 |
| 4712576 | Pneumatically operated valve An improved pneumatically operated valve for controlling supply of fluid to a certain apparatus adapted to be operated for an intended purpose using the thus supplied fluid. The valve includes a valve portion on the piston rod and a flow passage of fluid ... | 12/15/1987 |
| 4693276 | 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... | 09/15/1987 |
| 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 |
| 4588054 | Linear motion damper A linear motion damper is disclosed which comprises a hollow sleeve member, a rod reciprocating within the sleeve member, and a piston adapted to engage a fluid filled cylinder to provide resistance to linear motion by the exertion of lateral fluid pressu... | 05/13/1986 |
| 4544049 | Wheel cylinder assembly and seal arrangement therein A drum brake assembly having a wheel cylinder mounted on arms of a center guide backing plate by means of notches receiving the arms. The cylinder has pistons with low drag O-ring seals in grooves configured to provide seal forces which are aided by brake... | 10/01/1985 |
| 4516480 | Piston ring for endothermic motors having an improved flame damper ring The piston has at least one first piston ring groove for receiving a first compression ring and a flame damper ring groove located above said first compression ring for receiving a floating type flame damper ring. According to the invention, on the outer ... | 05/14/1985 |
| 4350082 | Pump piston having ring lubrication means A downhole oil well hydraulic pump has a reciprocating piston assembly with a piston ring mounted in a groove around the piston. This piston ring groove has a main portion which loosely mounts a piston ring and an auxiliary portion joining the main portio... | 09/21/1982 |
| 4346685 | Internal combustion engine with gas sealing device An internal combustion engine having a gas sealing device including an L-shaped keystone piston ring groove formed on the outer circumferential surface of a piston, and an L-shaped keystone piston ring in pressing contact with the inner surface of a cylin... | 08/31/1982 |
| 4270440 | High pressure piston and seal In a pump having a cylinder liner, there is a piston therein, a seal around the piston and rear wearband around the piston body to align the piston within the liner. An elastomeric seal ring is in sealing and sliding contact with the liner. A gap filler, ... | 06/02/1981 |
| 4240644 | Piston seal A piston seal having two spring tensioned rings which are biased radially toward the cylinder wall and seated in the uppermost one of the ring groove in the piston head. The upper ring has a relatively small and constant thickness of between 0.005 and 0.0... | 12/23/1980 |
| 4208953 | Plunger for compressors A plunger comprises a carrier and a hollow sleeve portion extending around a portion of the carrier. The sleeve portion rests between longitudinally spaced radial shoulders of the carrier. A portion of the carrier disposed within the sleeve is radially sp... | 06/24/1980 |
| 4203354 | Hydraulic piston with metallic O-ring groove and non-metallic slidable surfaces A fluid pressure actuated piston that consists of two parts, a metallic portion and a nonmetallic portion, is disposed in a conventional, metallic, cylindrical housing. The non-metallic portion is slidably engaged with the metallic housing. The metallic p... | 05/20/1980 |
| 4178899 | Low-friction piston A piston comprising hydrodynamic skirts and crowns, pressure-actuated sealing rings of fixed excursion or balanced by hydrodynamic reactions, or no rings at all, stringent temperature control, ample oil on the cylinder wall even near top-dead-center, char... | 12/18/1979 |
| 4155557 | Fluid seal An annular seal having first and second annular end faces extending substantially perpendicular to the axis of symmetry of the seal, said annular end faces being connected to each other by two axially extending surfaces each having the same axis of symmet... | 05/22/1979 |
| 4106463 | Double taper piston A piston for an internal combustion engine having a double tapered top land to provide controlled variation in the clearance about the head of the piston. The controlled variation in clearance about the piston head provides a sufficiently sized orifice wh... | 08/15/1978 |
| 4083292 | Piston with high top ring location An improved piston assembly comprising a generally cylindrical body having at one end a peripheral shoulder and at the other end a depending skirt, an annular ring groove protection band formed of hard metal and having a peripheral, radially outwardly ope... | 04/11/1978 |
| 4073218 | Actuating cylinder for a magnetic rail brake unit An actuating cylinder for a magnetic rail brake unit on a vehicle has a piston slidable within a cylinder and the piston has an end position at the head end of the cylinder. A pair of concentric conical mating surfaces are provided on the piston and cylin... | 02/14/1978 |
| 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 |
| 3999467 | Piston cylinder assembly A piston-cylinder assembly having a circumferential groove around the piston near the end of the piston facing the cylinder chamber, a cuff around the piston at a location more remote from said chamber from the groove, a guide ring mounted in the groove f... | 12/28/1976 |
| 3995982 | Molding apparatus A molding apparatus for forming articles and especially edible patties from such moldable materials as ground meat, fish and the like in which the apparatus includes a movable mold having a shaping portion therein, pressure means including a pressure cham... | 12/07/1976 |
| 3980004 | Piston and seal assemblies A piston and seal assembly is adapted to work in a cylinder, particularly a master cylinder of a vehicle braking system, the seal having a lip which sealingly engages the cylinder bore on the pressure stroke, an inner portion mounted on the piston, and an... | 09/14/1976 |
| 3953155 | Pump plunger A plunger for a downhole pump having a hollow mandrel with a concentrically arranged resilient cylinder thereabout, with an annular chamber formed between the mandrel and the cylinder. The annular chamber is flow connected to the interior of the hollow ma... | 04/27/1976 |
