Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 8137084 | Interlocking device for holding body and flange of machines using bean-shaped dowels An interlocking device for rigidly holding together the body and flange of a hydraulic machine includes a body, flange, gears, sealing elements acting as a body seal and lobe seal adapted to effectively seal pressurized oil pockets within the hydraulic machine with ... | 03/20/2012 |
| 7802973 | Compact vane pump with mixed suction and return flows A vane pump can effectively utilize the total quantity of a working fluid delivered from a vane section. The pump can be used for fluid pressure operated equipment requiring a high flow rate, does not create torque loss due to a throttle valve, and can prevent the o... | 09/28/2010 |
| 7488162 | Hydraulic pump for a power steering system A pump, in particular a hydraulic pump for a power steering system, has a housing. The pump is a prefabricated structural unit in which the end faces of the housing are closed by a flange and by a cover, respectively. The flange and the cover are braced against each... | 02/10/2009 |
| 7455507 | Structure for preventing cavitation erosion of oil pump A side face of a pump gear is formed into a stepped face such that an annular region extending radially from a diameter which is smaller than a dedendum circle diameter of the pump gear and larger than the outer diameter of a pump gear bearing to the addendum circle... | 11/25/2008 |
| 7399171 | Rotary pump for braking device The curvature of a circular arc constituted by a side of a suction groove is made larger than that of a circular arc constituted by a side of a discharge groove. Thus, when the suction groove and the discharge groove are viewed in the axial direction of a drive shaf... | 07/15/2008 |
| 7374411 | Oil pump adapted to prevent leakage without using sealing member An oil pump is provided which includes a cam ring made of a material having a first line expansion coefficient, a pump element rotatably disposed in the cam ring and smaller in an axial length than the cam ring, a first housing member disposed on one of axially oppo... | 05/20/2008 |
| 7361001 | Hydraulic vane pump A hydraulic vane pump includes a plurality of members forming a recession and an orifice in fluid communication with one another and with rotating vane cells at an inlet sector of the pump. Air entrained in the vane cells is exhausted through the recession and the o... | 04/22/2008 |
| 7347677 | Vane pump A body bore 2 formed in a body 1 is closed with a cover 9, as well as a cam ring 4 is incorporated into the body bore 2, and a rotor 6 is arranged inside the cam ring 4. Vanes 7 move in and out along an inner s... | 03/25/2008 |
| 7322808 | Balancing plate—shuttle ball A pressure compensation mechanism for a gerotor motor is disclosed, which mechanism includes a shuttle valve that selectively interconnects either port to a single pressure chamber and thus to compensate for any pressure-induced imbalances in the device. ... | 01/29/2008 |
| 7318422 | Fluid pump assembly A fluid pump includes an electric motor with a casing and a drive shaft extending from the casing, a pumping element coupled to the drive shaft for rotation with the shaft to take in fluid and discharge it under pressure. The fuel pump casing may be sealed and a hou... | 01/15/2008 |
| 7309218 | Gear pump A pump suitable for use with contamination-sensitive fluids such as food products or pharmaceutical fluids includes an outer casing containing an internal cavity, the outer casing having an enlarged opening on one end, a second opening on an opposite end, a first in... | 12/18/2007 |
| 7278841 | Gerotor pump Improved gerotor pumps comprising laterally constrained floating rings, thereby providing an orthogonal degree-of-freedom and allowing gerotor sets positioned therein to establish their own preferred mesh orientation, and additionally wherein the outer rotor of the ... | 10/09/2007 |
| 7275921 | Pumps A pump e.g. a screw pump, includes a main pumping element and a generally parallel auxiliary pumping element, and a pump housing, the main and auxiliary pumping elements interacting with each other and with an internal wall of an elongate pumping chamber of the hous... | 10/02/2007 |
| 7264455 | Rotary positive displacement hydraulic machines A rotary positive displacement hydraulic machine includes a housing defining two mutually intersecting parallel working chambers having a low pressure inlet side and a high pressure outlet side. Two meshing rotors are mounted for rotation in the two chambers, respec... | 09/04/2007 |
| 7238012 | Rotary pump A rotary pump has a simple construction by omitting a transmission shaft on the side of a motor and whereby makes a cost of the rotary pump as low as possible, with maintaining feature that assembling and disassembling is facilitated. The rotary pump has a main casi... | 07/03/2007 |
| 7229262 | Rotary piston pump end pressure regulation system A rotary piston pump for fluids, wherein the ends of the housing are configured so as to provide reduced pressure differentials between opposite sides of the rotor end disks. ... | 06/12/2007 |
| 7179070 | Variable capacity pump/motor A variable capacity pump/motor has a meshing internal and external gear set disposed between an upper mandrel and a lower mandrel, each including a flange extending towards the gears to divide a pump/motor chamber into suction and discharge chambers. The outer gear ... | 02/20/2007 |
| 7150612 | Gear pump or motor A gear•rear shaft containing main body of a bottomed type is penetrated with a bearing hole and a rear face of the gear•rear shaft containing main body is coupled with a closing plate to form an airtight seal from an outside environment. Shafts extended from two... | 12/19/2006 |
| 7144234 | Flanged gear pump The invention concerns a gear pump comprising a pump body (2) closed with a cover (3) forming a cavity wherein is provided a drive pinion (4) capable of being driven in rotation by a drive shaft (1) whereto it is fixed, a driven pinion ( | 12/05/2006 |
| 7086845 | Vane pump having an abradable coating on the rotor A vane pump includes a cylindrical rotor rotatable inside of an oval-shaped rotor chamber of cam ring disposed between a pressed plate and a pressure plate. The rotor has opposite sides and a peripheral outer surface in which radial vane slots are formed and guide s... | 08/08/2006 |
| 7074025 | Fluid delivery device A fluid delivery device, such as a geared machine or a gear pump, with a housing having at least one supply chamber and a displacement unit arranged within the supply chamber. The displacement unit serves to supply a medium to at least one pressure chamber provided ... | 07/11/2006 |
| 7037085 | Dual gear single outlet material pump and method of constructing such a pump A dual gear, single outlet material pump includes a base plate, a lower gear plate and two associated gears, a spacer plate, an idler shaft, a drive shaft, an upper drive gear, and an upper gear plate. An upper idler gear is housed within a tri-lobed aperture of an ... | 05/02/2006 |
| 7014439 | Vane pump having volume variable pump chambers communicatable with inlet and outlet In a vane pump, a rotor chamber is defined within a housing that includes a ring and first and second plates. An inlet is communicated with the rotor chamber through an intake groove, and an outlet is communicated with the rotor chamber through a discharge groove. A... | 03/21/2006 |
| 6997689 | Offset bearing for extended fuel pump life A bearing assembly (20) for a pump (12), e.g., an internal or external gear pump includes a journal bearing block (20) having a length, a width, and an axial centerline (CL′) passing through a center of the journal bearing block (20) wi... | 02/14/2006 |
| 6979185 | Bi-rotational pump/hydraulic actuator A novel bi-rotational pump adapted to pump fluid in either of two directions by reason of construction inclusive of passageways and an array of check valves and pilot pistons which cooperate in one direction and in another way in the other direction. ... | 12/27/2005 |
| 6905321 | Rotary pump for braking apparatus In a rotary pump for a braking apparatus, a discharge trench is formed on an axial direction end surface of a second side plate that forms a mechanical seal. As a result, rotors are pressed back toward a side of a first side plate by a discharge pressure of brake fl... | 06/14/2005 |
| 6902382 | Gear motor start up control A hydraulic motor comprising a housing having a fluid inlet. A fluid outlet and a cavity there between, a pair of intermeshing gear elements rotatable in the housing about mutually parallel axes. Each of the gear elements having a set of gear teeth disposed about th... | 06/07/2005 |
| 6887055 | Positive-displacement rotary pump A positive-displacement rotary pump comprising a pair of meshing gears (13, 14) or rotors, consisting of a driving gear and a driven gear, contained in a shell (10) having an output opening and an intake opening for a fluid. The gears (13, 14) i... | 05/03/2005 |
| 6808374 | Sanitary design gear pump A sanitary pump with gear shaft bearing blocks in opposed cylindrical portions of a pump body bore, blocks constituting hand removable structural pump ends. Gear shaft bearings extending completely through blocks for easy cleaning, sealed by O-rings and clamp plates... | 10/26/2004 |
| 6783340 | Rotor with a hydraulic overbalancing recess A rotary fluid pressure device having a housing member, a manifold assembly, a gerotor set, a channeling plate and an end plate. The gerotor set having a stator member with at least one axial fluid path extending therethrough and a rotor member, disposed within said... | 08/31/2004 |
| 6749411 | Rotary vane hydraulic power device A rotary vane device for hydraulic transmission of mechanical energy with industrial scale measures of power and rotational velocity. The device offers high measures of both volumetric efficiency and rotational velocity and hence substantial measures of functional e... | 06/15/2004 |
| 6716010 | Bearing arrangement A bearing arrangement for a gear pump comprises first and second separate bearing blocks each having a respective block housing. The first and second bearing blocks together defining an axially directed bearing surface including a bridge region formed from an erosio... | 04/06/2004 |
| 6672853 | Center driven pressure clamped hydraulic pump The problem of aligning the drive shaft of a pressure clamped pump with the output shaft of a drive motor in a hydraulic apparatus is solved through the use of pressure clamped pump having a housing adapted for installation into a cavity and a drive shaft... | 01/06/2004 |
| 6659748 | Axial compensation in an inner geared pump for a closed circuit An internal geared machine capable of forward and reverse operation in a closed circuit having a pinion and an internal toothed ring gear meshing with the pinion and disposed in a housing. A filling comprising two identical filler pieces fills a sickle-sh... | 12/09/2003 |
| 6655936 | Rotary vane pump with under-vane pump A vane pump including a rotating group comprising a thrust plate and a pressure plate which cooperate with a cam ring, rotor and vanes to provide a plurality of pump chambers. The thrust plate includes a pair of thrust plate passageways. Each thrust plate... | 12/02/2003 |
| 6641380 | Vane pump having a pressure plate and a shaft seal A pump is proposed, in particular a vane pump, for a liquid or gaseous medium, which can be driven with the help of a motor, in particular an electric motor, and which comprises a rotor (15) that can be coupled to a drive shaft (29) of the motor and is ar... | 11/04/2003 |
| 6599111 | Vane pump having an intake groove through a side wall member A vane pump comprising a pump housing, including an inlet, an outlet, and therein a hollow space, a cam ring received in the hollow space, a rotor placed in the cam ring and defining a rotation axis. The rotor comprises plural vanes arranged in correspond... | 07/29/2003 |
| 6598582 | Rotary heat engine An enclosed chamber external combustion rotary engine that converts thermal energy into mechanical energy, comprising of a tapered rotary disc with at least one perimeter quadrilateral vane oscillating inside enclosed expansion chambers formed on alternat... | 07/29/2003 |
| 6537047 | Reversible variable displacement hydraulic pump and motor A compact high efficiency vane pump is disclosed having a unique T-shaped vane and rotor slot configuration with a roller tip vane in a uniquely configured chamber. To minimize friction in chamber diameter, a pressure plate is provided which is hydraulica... | 03/25/2003 |
| 6481992 | Vane pump A vane pump includes a cylindrical rotor rotatable inside of an oval-shaped rotor chamber defined by a cam ring around the rotor. A thrust plate and a pressure plate on opposite sides of the cam ring cover the rotor chamber and are squeezed together by a ... | 11/19/2002 |
