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| Number | Title | Issue Date |
| 7938058 | Engine piston with rolling element skirt The present invention utilizes rolling elements, such as balls or rollers acting as bearings carried in openings in the skirt or equivalent portion of a piston, to engage the cylinder walls and replace the sliding bearings of the skirt with the roller elements in th... | 05/10/2011 |
| 7284526 | Ellipsoid roller bearing piston ring An improved piston ring suitable for use in an internal combustion engine is disclosed comprising a plurality of races sized to receive elongate rollers disposed around the circumference thereof. The elongate rollers may be shaped as a prolate ellipsoid or other rou... | 10/23/2007 |
| 7066077 | Device for supporting and for at least contributing to the activation of an actuating element A device for supporting and for at least contributing to the activation of an actuating element. An outer thin-walled bearing ring defines a pressure space to which pressure is applied. The outer thin-walled bearing ring at least partially bounds a circumference of ... | 06/27/2006 |
| 6871577 | Fill pump piston centering support A centering support for a piston in a piston-type pump having a diaphragm extending between the piston and the cylinder to define a product end of the pump and a driven end of the pump includes at least three equally radially spaced, centering elements extending rad... | 03/29/2005 |
| 6401593 | Drive and guide means for a load to be moved A drive and guide means for a load to be moved which comprises a rodless drive piston adapted to be driven by a pressure medium in a pressure medium cylinder, such piston having at least one force transmission part extending outward through a longitudinal... | 06/11/2002 |
| 5893318 | Ball bearing piston and liner This invention relates to a piston with skirt being formed by four sets of bearing grooves as the main structure, and a cylinder liner with four ball bearing rolling tracks. The bearing groove is in doughnut shape and has a circular cross-section to hold ... | 04/13/1999 |
| 5836235 | Piston for hydraulic actuating cylinders In order to reduce the weight and manufacturing cost of a piston for a hydraulic actuating cylinder, the piston, the piston rod and the external reinforcement cap are combined to form a unitary integral part. The unitary part is advantageously a single ex... | 11/17/1998 |
| 5615600 | Roller bearing piston This invention relates to a piston with its skirt being cut to locate four sets of bearing pads and circulating roller bearings. Each pad has been milled to have a doughnut shaped groove with half of a roller cross-section to hold the roller bearing in ci... | 04/01/1997 |
| 5601417 | Hydraulic pump with ball bearing pistons A hydraulic power unit combining a number of cylinders using ball bearings to displace hydraulic fluid sequentially with controlled flow to a number of hydraulic actuators. A power unit could combine a minimum of two cylinders through ten or twelve cylind... | 02/11/1997 |
| 5437220 | Ball bearing piston This invention relates to a piston with its skirt being cut to locate four sets of bearing pads and circulating bearing balls. Each pad has been milled to have a doughnut shaped groove with half of a circle cross-section to hold the ball bearing in circul... | 08/01/1995 |
| 5409049 | Tangential tire pressurizing and regulating apparatus Apparatus for harnessing and utilizing, inter alia, gravitational and centrifugal forces generated at a location eccentric from the axis of rotation of a rolling wheel. The apparatus includes pumps that can be attached in a tangential relationship to a pa... | 04/25/1995 |
| 5245913 | Piston of internal combustion engine A piston of an internal combustion engine, arranged to suppress engine noise and vibration while improving the frictional resistance and seizure resistance of a piston skirt. The piston skirt of the piston is formed at its outer peripheral surface with a ... | 09/21/1993 |
| 4807577 | Peristrophic internal combustion engine assembly and multi-part pistons A peristrophic internal combustion engine with increased power output has greater torque and reduced friction. The distance of rotation between the inertia weights and the crankpins is increased to increase torque. These transposed inertia weights are emb... | 02/28/1989 |
| 4704949 | Piston This application relates to a piston having two sets of three roller bearings mounted by means of milled grooves in a lightweight skirt of less diameter than the piston head. Each triangularly arranged set of roller bearings is symmetrically arranged to g... | 11/10/1987 |
| 4686794 | Stone guide for a superfinishing machine A stone guide for guiding the honing stone of a superfinishing machine. The stone guide receives a honing stone unit which comprises a honing stone and a honing stone holder. The honing stone holder defines a shoulder and a contact surface. The stone guid... | 08/18/1987 |
| 4603616 | Rotary actuator A rotary actuator is operable under the influence of fluid pressure to rotate a driven member. The rotary actuator includes a drive member which extends into a chamber in a housing. Helical splines interconnect a piston and the drive member to rotate the ... | 08/05/1986 |
| 4596179 | Reciprocating machine A reciprocating engine comprising a cylinder, a piston performing reciprocating movement within the cylinder, a crank shaft performing rotational movement, a connecting rod connected rotatably at its one end to the crank shaft and at its the other end to ... | 06/24/1986 |
| 4517879 | Machine comprising a reciprocating operative member In a machine of the kind in which an operative member under the actuation of driving means is reciprocatable relative to a guide member in order to exert forces in a predetermined direction on a workpiece, toothed and elongate roller bodies having their a... | 05/21/1985 |
| 4485728 | Reciprocating machine A reciprocating engine comprising a cylinder, a piston performing reciprocating movement within the cylinder, a crank shaft performing rotational movement, a connecting rod connected rotatably at its one end to the crank shaft and at its the other end to ... | 12/04/1984 |
| 4466335 | Sealing for variable volume device An improvement for a variable volume device in the form of a rectilinear case having disposed therein a rectilinear outer piston structure and a rectilinear inner piston structure within the outer piston structure, the inner piston being carried for rotat... | 08/21/1984 |
| 4442759 | Power booster unit The piston and cylinder of a hydraulic power booster are provided with opposed longitudinal grooves effecting a pocket for a series of rollers axially aligned and on an axis parallel to that of the piston-cylinder axis. A leaf spring in the piston groove ... | 04/17/1984 |
| 4268042 | Flexible bellows piston seal Means and method are provided for utilizing a piston and cylinder combination eliminating the usual sealing and oil rings and their accompanying friction and replacing them with ball bearings which in the principal embodiment are captured in splitring cag... | 05/19/1981 |
