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| Number | Title | Issue Date |
| 7204184 | Guide system with pneumatic stop for a movable component In a guide system with a pneumatic stop structure comprising a cylinder with a piston including a piston seal element movably disposed in the cylinder and a piston rod connected to the piston and extending from the cylinder wherein a displacement chamber is formed a... | 04/17/2007 |
| 6481336 | Piston with pressure-dependent sealing effect for a piston-cylinder arrangement, in particular a shock absorber piston The invention relates to a piston-cylinder arrangement, especially a shock absorber piston, comprising a piston body fitted with at least two peripheral webs on its peripheral surface, said webs limiting a groove and also including a collar-shaped sealing... | 11/19/2002 |
| 5372488 | Oil well pump with radially expandable interlocking seal ring Improvements in a downhole submerged pump assembly having a plunger formed of a cast or machined cylindrical member includes seal ring grooves capable of receiving flat metallic seal rings formed of a plurality of segments which are interlocked in a manne... | 12/13/1994 |
| 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 |
| 5079997 | Piston seal device for a pneumatic cylinder A piston seal device of pneumatic cylinder which satisfies the required tightness of a seal as well as the required lubrication characteristics for a piston movement is disclosed. The piston seal device for maintining different pressures acting on each si... | 01/14/1992 |
| 4762476 | Oil well pump An oil well subsurface pump comprising a housing for reciprocal disposition with a working barrel and having one end thereof adapted to be secured to the lowermost end of a sucker rod, or the like, and the opposite end thereof in open communication with t... | 08/09/1988 |
| 4597320 | Diaphragm type vacuum actuator A diaphragm type vacuum actuator movably providing in a case a rod having piston plates, the piston plates being connected to an inner peripheral surface of the case by means of two diaphragms so as to divide a case inside into a first chamber and a secon... | 07/01/1986 |
| 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 |
| 4452310 | Metal-to-metal high/low pressure seal A dynamic metal-to-metal seal for use in a double acting piston and cylinder for use in high pressures and temperatures. First and second metal cup seals engage the piston and face in opposite directions for sealing against the cylinder wall whereby the h... | 06/05/1984 |
| 4395204 | Oil well pump An oil well subsurface pump comprising a housing for reciprocal disposition within a working barrel and having one end thereof adapted to be secured to the lowermost end of a sucker rod, or the like, and the opposite end thereof in open communication with... | 07/26/1983 |
| 4175475 | Worm thread seal for steering gear Worm to rack piston seal for power steering gear having a resilient cylindrical body with internal thread construction conforming to the profile and lead of the worm for a rack piston nut. During powered right and left turns, the seal is pressure loaded r... | 11/27/1979 |
| 4154207 | Piston and ring for reducing HC emissions An internal combustion engine is provided with pistons having openings connecting the space behind one of the piston rings with the crankcase during certain portions of the operating cycle of the engine. This is accomplished by the use of a differential p... | 05/15/1979 |
