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| Number | Title | Issue Date |
| 7197875 | Hydraulic cylinder with coaxial, in-line reservoir A compact hydraulic cylinder may include a pressure chamber and a reservoir in coaxial, in-line arrangement relative to one another. The pressure chamber and reservoir are separated from one another in use by a piston and hydraulic seal. The piston may be withdrawn ... | 04/03/2007 |
| 6928921 | Piston bore A piston for a compressor for use in hermetically encapsulated small-type refrigerating machines, with a cylinder-jacket-like sealing and guide surface section (1a, 2) as well as at least two substantially bridge- and cylinder-jacket-sector-like... | 08/16/2005 |
| 5481879 | Refrigerator having regenerator A refrigerator with a regenerator having a good and stable cooling function comprises: a cylinder having a circular inner surface and being made of a material having a low heat conductivity and a high hermetic sealing performance; a displacer having a cir... | 01/09/1996 |
| 5172626 | Stabilized piston skirt having varying peaks and concave surfaces A piston with a skirt shaped to accommodate distortion by changing thermal and load conditions is further modified to increase stability and broaden load distribution to reduce contact forces and wear by providing maximum radii lines on either side of a l... | 12/22/1992 |
| 5120203 | Universal plunger for oil well pumps A universal plunger for oil well pumps, which universal plunger includes a symmetrical plunger body having a longitudinal bore, a pair of threaded flange nipples projecting from end flanges located on each end of the plunger body, a pair of spaced O-ring ... | 06/09/1992 |
| 4867280 | Hydraulically actuated wheel brake A brake system of the type having a disc-type wheel brake hydraulically operated by a master cylinder through connecting lines is disclosed. The system includes a member which divides the wheel brake into two chambers, one adjacent to the brake piston fil... | 09/19/1989 |
| 4841846 | Pneumatic actuators with liquid seals for oil and gas well swabs Apparatus and method for maintaining viscous liquid sealing substances such a grease adjacent and in contact with seals utilized in pneumatic cylinder-and-piston actuators for oil and gas well swabs, the structure including a piston member which is slidea... | 06/27/1989 |
| 4776261 | Reciprocating engine piston seal Apparatus for sealing the gap between a piston and engine cyinder wall of either a reciprocating engine or a reciprocating compressor. The apparatus includes a plurality of functionally-identical, gas-bearing-supported seal blocks that locate in a slot ru... | 10/11/1988 |
| 4715854 | Multidose disposable syringe and method of filling same The multidose syringe is provided with two pistons which are attached by a string to move simultaneously. A groove in the barrel for delivering fluid into and from the innermost fluid chamber is provided with baffles to create turbulence in the fluid flow... | 12/29/1987 |
| 4678010 | Accumulator for airless spraying apparatus A gas-liquid piston accumulator having improved piston lubrication by providing a plurality of blind hole lubricating passages around the periphery of the piston.... | 07/07/1987 |
| 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 |
| 4646849 | Reversible plough having a reversing and adjustment mechanism A reversing and adjustment mechanism, especially for a reversible plough adapted for hydraulically adjustable furrow width and hydraulic reversing of the plough, wherein the reversing and adjustment mechanism comprises a hydraulic cylinder (8) with a "hyd... | 03/03/1987 |
| 4512151 | Intensifier The invention relates to an intensifier using liquid, comprising at least one cylinder which has plural pistons and a lubricating chamber between them.... | 04/23/1985 |
| 4471795 | Contamination free method and apparatus for transfer of pressure energy between fluids A means and apparatus for transfer of pressure energy from a first fluid at high pressure to a second fluid at lower pressure via a piston mounted for free floating movement within a cylinder communicating on one side with the first fluid and at the other... | 09/18/1984 |
| 4442757 | Fluid pressure actuator having bias element immersed in non-corrosive environment An improved valve actuator is provided for employment in environments such as subterranean wells where highly corrosive gases and fluids are contained in the well fluid which is normally pressurized and employed to operate the actuator. The bias element o... | 04/17/1984 |
| 4086844 | Hydraulic cylinder utilizing corrugated running surfaces The piston of a hydraulic cylinder is provided with a corrugated running surface composed of angularly disposed ribs and valleys therebetween, the ribs bearing against the relatively smooth bore of the tubular casing in which the piston reciprocates. Wher... | 05/02/1978 |
