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| Number | Title | Issue Date |
| 7377406 | Two stage grease gun A portable grease gun with a dual pressure output capability which can be selectively changed by the user with little effort. The larger diameter plunger is slidable within a plunger retainer. The larger diameter plunger has a bore through them in which a smaller di... | 05/27/2008 |
| 7353746 | Two-stage hand pump A hand pump for inflating rafts or similar inflatables has a first piston with a relatively low pumping volume which is capable of pumping relatively small volumes of air into a raft as the raft becomes full and is approaching its maximum pressure, and a second pist... | 04/08/2008 |
| 7337927 | Two stage grease gun A portable grease gun with a dual pressure output capability which can be selectively changed by the user with little effort. A larger diameter plunger is longitudinally coupled to an extension. The larger diameter plunger and its extension are variable in length by... | 03/04/2008 |
| 7185551 | Pipetting module An air-filled pipette for accurately metering small and large volumes of fluid samples is provided. The pipette has dual resolution capability such that the pipette can accurately aspirate a wide range of sample volumes and deliver them contact-free (touchless). The... | 03/06/2007 |
| 7156626 | Double side action type reciprocating compressor A double side action type reciprocating compressor is provided. The double side action type reciprocating compressor includes suction valve assemblies and discharge valve assemblies loaded in a suction passage and a discharge passage to thus control suction of fluid... | 01/02/2007 |
| 7028600 | Hydraulic radial piston engine A hydraulic radial piston engine has a lifting ring fixed to the casting, a rotor mounted opposite the lifting ring such that it is rotatable about an axis of rotation, multiple piston seats aligned radially in the rotor relative to the axis of rotation, and multipl... | 04/18/2006 |
| 6929064 | Downhole pump There is disclosed an improved pump (5, 5′) particularly suitable for use in a method of “artificial lift” in an oil/gas well. Known pumps used in artificial lift methods suffer from a number of problems/disadvantages—e.g. low efficiency (hydraulic ef... | 08/16/2005 |
| 6705845 | Device for the metered delivery of a viscous liquid A device for the metered delivery of a viscous liquid has a pump body with a drill hole accommodating two pistons which connects a first chamber serving as an intake chamber and a second chamber serving as a discharge chamber. Two swivel arms driven by two cam discs... | 03/16/2004 |
| 6358024 | High capacity supply pump with simultaneous directly actuated plungers A high pressure fuel supply pump comprising a housing (102) and a pump body (108) fixed within the housing along a body axis and including a plurality of radially oriented plunger bores (20), each bore having a plunger (22) disposed therein. An actuating ... | 03/19/2002 |
| 6257849 | Manual air pump having selectable high pressure and high pressure modes A manual air pump includes an outer cylinder having a chamber therein, a head provided to a second end of the outer cylinder and including an outlet passage communicated with the chamber for supplying air to an object to be inflated, and an inner cylinder... | 07/10/2001 |
| 6135733 | Manual air pump having selectable high pressure and low pressure modes A manual air pump includes a cylinder having a first chamber and a head provided to the second end of the cylinder. The head includes an outlet passage communicated with the first chamber for supplying air to an object to be inflated. A first piston rod h... | 10/24/2000 |
| 6132189 | Combined bicycle tire and air suspension pump with removable pressure gauge A pump includes a first cylinder with a first valve member connected to a first end of the first cylinder and a first handle disengagably connected to a second end of the first cylinder. A first piston is movably received in the first cylinder and a secon... | 10/17/2000 |
| 6030194 | Gerotor motor and improved valve drive and brake assembly therefor A gerotor motor (11) of the type having a spool valve (45) disposed opposite a main drive shaft (35). The motor also includes a set of brake discs (104) in engagement with an extension (45e) of the spool valve (45), and a set of brake discs (106) in engag... | 02/29/2000 |
| 5934889 | Pump driven by cam having the cylinder supported by the cam shaft A pump for performing suction and discharge of a liquid, including: a cylinder supported at at least a first support point and a second support point; a piston slidably disposed in the cylinder and forming a pump chamber having a volume changeable by slid... | 08/10/1999 |
| 5779457 | Hand pump for pumping air of lower pressure and high pressure A hand pump includes a cylindrical member having a cap secured on top and a cover securing the cap to the cylindrical member. A large piston is slidably engaged in the cylindrical member and a barrel secured to the large piston. A small piston is slidably... | 07/14/1998 |
| 5769616 | Submerged pump with coaxial opposing pistons, driven by double lobed camshaft The submerged pump according to the present invention comprises one or more modular pumping groups, each consisting of a balanced, coaxial and opposing piston couple 7 on spool wheels 10 and with a spring 12 return.... | 06/23/1998 |
| 5746584 | Inner cam type fuel injection pump having modified plungers In an inner cam type injection pump, the side surface of the protruding portion of each of the plungers facing the compression space is formed in a projecting shape in the area where the plunger changes from the base end side into the front end. Specific ... | 05/05/1998 |
| 5613839 | Variable rate pump A variable rate pump including a distributor member rotatable within a sleeve. The distributor member is provided with a bore within which a pumping plunger is reciprocable under the influence of a first cam lobe and a second cam lobe. A valve is provided... | 03/25/1997 |
| 5542827 | Multiple nested pistons hand priming pump with spring biasing A multiple piston hand priming pump includes a plurality of nested pistons engaged within a hollow cylindrical housing. One end of the housing has an inlet/outlet fitting leading to a pumping chamber defined within the housing and the other end of the hou... | 08/06/1996 |
| 5443370 | Two cylinder manual air pump An air pump comprises a head; an air guiding tube fastened at one end thereof with the head and at another end thereof with a two-way air admitting piston; a first cylinder fitted over the two-way air admitting piston such that the first cylinder can be c... | 08/22/1995 |
| 5366904 | Method of metering a fluid using a multi-mode differential fluid displacement pump A measured amount of a first fluid is metered into a measured amount of a second fluid by a method where a fluid is confined within a first chamber and a plunger of predetermined volume is mechanically moved into the chamber to displace a first measured a... | 11/22/1994 |
| 5013198 | Air-hydraulic pump with auxiliary pumping means An air-hydraulic pump incorporates a primary pumping mechanism for supplying a first level of fluid pressure to a work-performing tool at a first flow rate in response to a supply of pressurized air. An auxiliary pumping mechanism is provided for deliveri... | 05/07/1991 |
| 4568250 | Low power electromagnetic pump An electromagnetic pump comprising a housing having a fluid receiving chamber in communication with an inlet, a pair of serially-connected fluid pumping chambers, one in communication with the fluid receiving chamber and the other in communication with an... | 02/04/1986 |
| 4501246 | Fuel injection pump A fuel injection pump is proposed in which the fuel metering during the intake stroke of the pump pistons of the fuel injection pump is effected via a pressure conduit, the cross section of which is controlled first by an electrically controlled switching... | 02/26/1985 |
| 4486154 | Fuel injection pump There is proposed herein that a push rod of a fuel injection pump embodied as a radial piston pump which push rod further has a groove in its base be arranged to positively secure a roller in a relatively fixed position. The push rod is slidably guided in... | 12/04/1984 |
| 4435133 | Free piston engine pump with energy rate smoothing A free piston engine pump which utilizes plural hydraulic piston areas or hydraulic pressures, with suitable valving to properly "phase" these areas or pressures during the engine stroke, to generate plural hydraulic work rates in order to smooth out the ... | 03/06/1984 |
| 4386889 | Radial wave pump A positive displacement pump comprising an enclosure having parallel walls and a plurality of concentric annular rings reciprocally mounted between said walls is disclosed. By reciprocating the rings in a predetermined sequence, fluid is caused to flow th... | 06/07/1983 |
| 3948589 | Primer valve The primer valve disclosed herein includes a housing having an inlet communicating with a fuel source, an outlet communicating with an engine intake manifold, and a flow passageway extending therethrough from the inlet to the outlet. A port surrounded by ... | 04/06/1976 |
