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| Number | Title | Issue Date |
| 7661935 | High pressure pump An ultrahigh pressure pump includes a frame including at least one radially-extending member having an outer frame pivot disposed at outer end thereof; a crank rotatably mounted in the frame and adapted to be driven by a power source and a crank pin offset from a ro... | 02/16/2010 |
| 7244107 | Home oxygen-compression apparatus An oxygen-compression apparatus has a driving device, multiple rotating wheels, multiple driving rings, multiple rocking cylinders and multiple connecting hoses. The driving device has a driving shaft with a central axis. The rotating wheels are eccentrically attach... | 07/17/2007 |
| 6957646 | Pump An air gun includes an air pump with a pumping piston mounted to reciprocate within a pump cylinder, which is mounted on the barrel of the gun to pivot about an axis transverse to the longitudinal axis of the barrel so that as the pump cylinder is moved back and for... | 10/25/2005 |
| 6913447 | Metering pump with varying piston cylinders, and with independently adjustable piston strokes A metering pump includes an actuating mechanism, and a plurality of piston cylinders coupled to the actuating mechanism. A first of the cylinders has a working volume that differs from a second of the cylinders. The actuating member is centrally located and the cyli... | 07/05/2005 |
| 6179583 | Metered fluid delivery device A metering device for pressurized fluids has a rotor containing an oscillating free piston operating in a bore at right angles to the rotor axis. The piston is driven by the fluid to be metered. The rotor is retained within a stator having inlet and outle... | 01/30/2001 |
| 5934173 | Reciprocating plunger pump An improved reciprocating plunger pump boasting a self-aligning plunger assembly, a selectively removable plunger guide cartridge, and an improved seal cartridge assembly.... | 08/10/1999 |
| 5619232 | Maintenance station of ink jet printer and cap and pump included therein An ink jet printer includes a maintenance station which is simple in construction and small-sized. A cap holder is provided with a suction port communicating with a cap through a communication hole, a discharge port and a vent port. Provided in the cap ho... | 04/08/1997 |
| 5616014 | Power grease pump A power grease pump having a rotary disk fixed on a base plate and rotating by a power device, and a rotary axis eccentrically mounted thereon. The pump unit includes a cylinder body with both ends being sealed and a piston assembly accommodated therein. ... | 04/01/1997 |
| 5429681 | Electronic condiment dispensing apparatus An electronic condiment dispenser may dispense a plurality of condiments. The condiment dispenser may include a bag support module for holding a plurality of condiment supply bags. A pump regulator module may be connected to each condiment bag and may pum... | 07/04/1995 |
| 5221195 | Pressure testing pump A hand lever actuated pump for testing a water line for leaks by pumping water into the line under pressure comprises a container for water to be pumped and a hand lever actuated piston and cylinder type pump having suction and discharge strokes in respon... | 06/22/1993 |
| 4961694 | Lever arm pump A pump is described including an elongated cylindrical reservoir, a valve casing, at which the pump is pivotally fixed in space, and a pump chamber which are in a linear arrangement. A piston within the pump chamber is connected to a link, the end of whic... | 10/09/1990 |
| 4683806 | Piston guide for hollow piston of a radial piston engine In a radial piston engine, in order to reduce the friction forces appearing at the pistons, a guide part is provided which engages a hollow piston through a guide section and which includes a bearing section at its outer end, by means of which the guide p... | 08/04/1987 |
| 4530646 | Pump jack operated compressor A compressor of the reciprocating piston and cylinder type especially adapted for use in moving gas from the wellhead or casing of a producing oil or gas well into the gas sales line with the compressor being operated by the conventional pump jack utilize... | 07/23/1985 |
| 4527460 | Radial piston machine A radial piston machine has a cylindrical housing which encloses a rotary shaft formed with an eccentric. A plurality of stationary piston rods is connected to the inner wall of the housing and radially directed toward the shaft. The free ends of piston r... | 07/09/1985 |
| 4509903 | Catalyst slave pump The novel slave pump having a piston rod having a fluid passage through which catalyst is discharged for ultimate use. The slave pump also has an exterior casing which holds it together without contacting the catalyst or other fluids being pumped. A novel... | 04/09/1985 |
| 4310290 | Radial piston pump A radial piston pump has a housing bounding a suction chamber therein and provided with a plurality of pressure ports spaced from one another in circumferential direction of this housing, and with at least one suction port. A plurality of valve units spac... | 01/12/1982 |
| 4289458 | Foot pumps A foot pump comprises a base member and an operating member pivotally connected to the base member. A piston-and-cylinder assembly is connected between the members. In use the user depresses the operating member with his or her foot, thereby causing air t... | 09/15/1981 |
| 4277228 | Radial piston pump A radial piston pump comprises a housing bounding a suction chamber therein and at least one valve piston unit mounted in the housing. The valve piston unit includes a pressure valve defining a pressure chamber, a movable piston having an axial passage op... | 07/07/1981 |
| 4242060 | Foot pumps A foot pump comprises a base member and an operating member pivotally connected to the base member. A piston-and-cylinder assembly is connected between the members. In use the user depresses the operating member with his or her foot, thereby causing air t... | 12/30/1980 |
| 4010675 | Two stroke mechanism with rotary piston and cylinder-piston movement A two stroke mechanism is described which has rotary moveable piston and cylinder-piston elements. The piston and cylinder-piston elements both rotate within a stationary body forming two variable volume chambers. The first variable volume chamber formed ... | 03/08/1977 |
