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| Number | Title | Issue Date |
| 6644940 | Restarting device for a fluid operated double diaphragm piston pump A restarting device of a pump including a center rod defining fluid delivering chambers and driving chambers 11b and 12b. The restarting device of the pump further includes: a change-over valve 2 for switching a direction for the center rod to move, and a... | 11/11/2003 |
| 6422832 | Air pump capable of inflating and deflating an inflatable object interchangeably An air pump is capable of inflating and deflating an inflatable object and is formed of a main body having a cylinder duct, an air outlet and an air inlet in communication with the cylinder duct. The air in the cylinder duct is let out via the air outlet.... | 07/23/2002 |
| 6257843 | Self-aligning double-acting simplex plunger pump A self-aligning double-acting simplex plunger pump comprising first and second combined plunger stuffing box and head members or blocks. A manifold is adapted to be abutted against one surface of the blocks and second spaced apart parallel surfaces of the... | 07/10/2001 |
| 5992696 | Manifold for a metering cylinder A manifold for a double acting metering cylinder having a fluid tight reciprocal piston forming a pair of expandable and retractable chambers, the manifold having a housing with passageways therein and directional valves to selectively deliver fluid mater... | 11/30/1999 |
| 5318317 | Bicycle operated air pump An air pump for use with a chain-driven bicycle having a freewheel. The pump assembly comprises a pair of opposed cylinders and a double-ended piston rod mounted in a housing. The piston rod has a bearing slot which engages a crank pin on a crankshaft whi... | 06/07/1994 |
| 5183396 | Double acting simplex plunger pump A double acting simplex plunger pump comprising a pair of unique unitary combined stuffing box and head members pre-assembled with a double ended plunger, the subassembly being sandwiched between the axial end face of a drive motor and a flat surface of a... | 02/02/1993 |
| 5173039 | Double acting simplex plunger pump A double acting simplex plunger pump comprising a pair of unique unitary combined stuffing box and head members pre-assembled with a double ended plunger, the subassembly being sandwiched between the axial end face of a drive motor and a flat surface of a... | 12/22/1992 |
| 4750871 | Stabilizing means for free piston-type linear resonant reciprocating machines A resonant reciprocating compressor wherein a reciprocating assembly comprising the movable armature of an electric reciprocating motor and a piston means coupled to the armature is driven cyclically when the electric motor is energized from an alternatin... | 06/14/1988 |
| 4710109 | Diaphragm pumps with improved structural cooling and maintenance A diaphragm pump has at least one double-acting piston moving in a cylinder closed at its ends by diaphragms and filled with oil. The diaphragms are capped by cylinder heads defining the chambers in which warping of the diaphragms produces the suction and... | 12/01/1987 |
| 4664606 | Reciprocating pump for fluids, specifically such contaminated by solids The invention concerns a reciprocating pump for liquid substances, specifically such contaminated by solids. To render such a reciprocating pump self-cleaning, it is suggested to arrange the intake chamber (7), pressure chamber (2), and the pressure chamb... | 05/12/1987 |
