Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 7972126 | Power steering system hydraulic pump A power steering system hydraulic pump has a pump component which is to be sealed and a first pump cover. A flat sealing element is provided between the pump component which is to be sealed and the first pump cover. ... | 07/05/2011 |
| 7905717 | PD pumps with a common gearbox module and varying capacities and easy access to mechanical seals Rotary lobe pump and circumferential piston pump designs are disclosed where the drive and driven shafts are detachably connected to their respective rotors. The rotors are disposed in a pump or rotor casing, which is sandwiched between a head cover and a gearbox. T... | 03/15/2011 |
| 7686601 | High pressure telescoping gear pumps and motors Rotary seals in a telescoping gear pump/motor a feature that allows the seal to shift radially relative to other components while maintaining the seal integrity and without compromising the function of the bearings or the bushings needed to bear the load. ... | 03/30/2010 |
| 7537441 | Gear pump and liquid injection apparatus A high-performance gear pump that does not require highly accurate machining is disclosed. The gear pump includes a housing having an accommodation chamber. A drive gear and a driven gear are positioned in contact with an inner surface of the accommodation chamber. ... | 05/26/2009 |
| 7335005 | Gear pump with prestressed gear teeth A gear pump, in particular for pumping material such as rubber mixes, includes an enclosure in which a central gear wheel and two peripheral gear wheels rotate. Teeth of the central gear wheel mesh with teeth of both peripheral gear wheels to pump material from an i... | 02/26/2008 |
| 7296984 | Gear pump and liquid injection apparatus A gear pump includes a housing defining an accommodating chamber and a cover for sealing the accommodating chamber. The accommodating chamber accommodates a drive gear and a driven gear. Each of the drive gear and the driven gear includes an upper surface opposed to... | 11/20/2007 |
| 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 |
| 7214041 | Seal assemblies A seal assembly for the protection of a static seal device for use in a vacuum pump. The seal assembly comprising at least two components which are sealingly connected together, an o-ring seal, which is engaged between the two components to prevent transfer of fluid... | 05/08/2007 |
| 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 |
| 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 |
| 7052259 | Vacuum exhausting apparatus In a screw type vacuum pump which includes a housing provided with a rotor chamber, a pair of screw rotors in mesh with each other rotably provided in the rotor chamber, a transfer chamber of gas formed between an inner wall of the housing and flutes of the aforesai... | 05/30/2006 |
| 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 |
| 6857860 | Metering pump for liquid products The invention concerns a metering gear pump comprising a set of gears supported and guided solely by the inner peripheral surface of the lobe of the chamber wherein they are housed. They do not comprise any shaft to act as support or guide, thereby enabling to reduc... | 02/22/2005 |
| 6814045 | Rotary internal combustion engine There is provided a rotary internal combustion engine (20) comprising a plurality of rotors (21) each having a plurality of lobes (22) for intermeshing with lobes of other rotors to form successive combustion chambers. Axial seal elements (60... | 11/09/2004 |
| 6783342 | Method and apparatus for timing rotors in a rotary lobe pump A rotary lobe pump includes two geared-together, counter-rotating shafts, to which are affixed rotors with interdigital lobes. Adjustment of the angular relationship of the rotors uses a clamping device within each rotor. The clamping device consists of a tapered, s... | 08/31/2004 |
| 6688864 | Oil leak prevention structure of vacuum pump A vacuum pump draws gas by operating a gas conveying body in a pump chamber through rotation of a rotary shaft. The vacuum pump has an oil housing member. The oil housing member defines an oil zone adjacent to the pump chamber. The rotary shaft has a proj... | 02/10/2004 |
| 6688863 | Oil leak prevention structure of vacuum pump A vacuum pump draws gas by operating a gas conveying body in a pump chamber through rotation of a rotary shaft. The vacuum pump has an oil housing member, a stopper and a circumferential wall surface. The oil housing member defines an oil zone adjacent to... | 02/10/2004 |
| 6663367 | Shaft seal structure of vacuum pumps A Roots pump rotates a plurality of rotors by a pair of rotary shafts to draw gas. Each rotary shaft extends through a rear housing member of the Roots pump. An annular shaft seal is fitted around each rotary shaft and is received in a recess formed in th... | 12/16/2003 |
| 6659746 | Shaft seal structure of vacuum pumps A Roots pump rotates a plurality of rotors by a pair of rotary shafts to draw gas. Each rotary shaft extends through a rear housing member of the Roots pump. An annular shaft seal is fitted around each rotary shaft and is received in a recess formed in th... | 12/09/2003 |
| 6659747 | Shaft seal structure of vacuum pumps A Roots pump rotates a plurality of rotors by a pair of rotary shafts to draw gas. Each rotary shaft extends through a rear housing member of the Roots pump. An annular shaft seal is fitted around each rotary shaft and is received in a recess formed in th... | 12/09/2003 |
| 6612821 | Pump, in particular gear pump including ceramic gears and seal A gear pump having a housing with an inlet and an outlet. First and second gears are provided with meshing gear teeth. The gears are ceramic rotor gears which are journaled within the housing. A drive shaft drives the first gear in order to move it relati... | 09/02/2003 |
| 6554594 | Shaft seal structure for vacuum pump A vacuum pump has a housing accommodating a rotary shaft and a gas transferring assembly driven by the rotary shaft. The housing has an exhaust passage for exhausting gas outside the housing. The gas transferring assembly creates a vacuum. A lip seal for ... | 04/29/2003 |
| 6537046 | Device for reducing the axial force load of a fluid supply pump The invention relates to a device for delivering fuel from a tank to an internal combustion engine, wherein a pump chamber is embodied in the housing of the feed device. Rotary driven displacing elements are contained in the housing. The shaft supporting ... | 03/25/2003 |
| 6527529 | Geared feed pump having a platelike cover element and an indented end cap The geared feed pump has a housing, in which a pump chamber is formed between a housing part and a cap part, and a pair of gear wheels, driven to rotate and meshing with one another on their outer circumference, are disposed in the pump chamber and pump a... | 03/04/2003 |
| 6481410 | Rotary piston engine/positive displacement apparatus An engine displacement device including a casing with two internal overlapping rotor chambers, and rotors within the rotor chambers which are arranged to contra rotate to provide internal combustion and/or compression chambers. The casing provides for pri... | 11/19/2002 |
| 6309199 | Assemblies for modular fluid pump Discloses apparatus for use with a modular fluid pump assembly, particularly pumps used to pump fluids containing entrained contaminants such as grit. The apparatus includes a pair of removable end plates attachable to a modular pump housing. A bearing as... | 10/30/2001 |
| 6283740 | Rotary lobe pumps A rotary lobe pump is provided with an improved sealing mechanism between the rotor and outside diameter of the shaft upon which the rotor is mounted. An adapter is provided for the drive shaft which enables the drive shaft to be easily coupled to a varie... | 09/04/2001 |
| 6254366 | Replaceable seal having a friction fit A replaceable seal for a rotor in a rotary fluid machine has a unitary body with integrally formed longitudinal and radial seal portions secured by a friction fit in grooves in the rotor. The longitudinal seal portion includes an outwardly biased seal lip... | 07/03/2001 |
| 6253747 | Torsional coupling for supercharger A supercharger (26) has first (28) and second (29) meshed lobed rotors, each having associated therewith a timing gear (62), the timing gears being meshed to prevent contact of the meshed lobes of the rotors (28,29). Input torque to the supercharger (blow... | 07/03/2001 |
| 6244841 | Vacuum pumps A vacuum pump comprising a pump chamber having an inlet and an outlet and through which gas from an enclosure connectable to the inlet can be pumped to a pump exhaust. At least one rotor, adapted for high velocity rotation, is provided within the chamber ... | 06/12/2001 |
| 6200117 | Rotary lobe pumps A rotary lobe pump is provided with an improved sealing mechanism between the rotor and outside diameter of the shaft upon which the rotor is mounted. An adapter is provided for the drive shaft which enables the drive shaft to be easily coupled to a varie... | 03/13/2001 |
| 6183231 | Clean-in-place gear pump A gear pump having shafts mounted with rolling element bearings and having mechanical seals on the face of the gears provides improved "clean-in-place" ability. Preferably, washer-like seals are mounted on the face of the gears with a suitable adhesive an... | 02/06/2001 |
| 6171089 | External gear pump with drive gear seal A metering pump includes a set of externally-toothed gears, with a first of the gears, the drive gear, having a central opening to receive a drive shaft. The gears are supported within a housing defined between first and second housing plates. The first a... | 01/09/2001 |
| 6095781 | Timed element, high pressure, industrial rotary lobe pump A dual shaft, timed element high pressure industrial rotary lobe pump is provided. Lubricated sleeve bearings are located adjacent to the pumping elements. If the sleeve bearings are disposed on both opposing sides of the pumping elements, the lobe pump o... | 08/01/2000 |
| 6053717 | Rotary pump with wiper insert A positive displacement rotary pump with an improved impeller design integrating a replaceable wiper insert. The impeller generally has or more lobes and an equal number of conjugate surfaces. Each lobe has a cavity which holds a wiper blade. The wiper bl... | 04/25/2000 |
| 5997268 | Positive displacement hydraulic machine having a recess receiving a spigot for sealing A pressure fluid apparatus includes first and second parts which are adapted to be secured together. A first sealing surface of the first part forms a seal with a corresponding second sealing surface of the second part. The first sealing surface includes ... | 12/07/1999 |
| 5957677 | Rotary lobe pump with magnetic rotor retention system An improved rotary lobe pump has a pumping chamber (1) having a housing (2) closed by a front wall (3)and a rear wall (6). The front housing wall (3) is secured to the housing (2) by bolts (4) and is sealed with a gasket (5). The housing (2) comprises a r... | 09/28/1999 |
| 5924854 | Gear pump channel arrangement for tempering media In order to cool the slide bearing area for the slidable bearing of a gear pump shaft, a slide bearing bush with a slide bearing area and, in the case of the guiding-through of a shaft, a sealing area extends in one piece integrally to the outside, and a ... | 07/20/1999 |
| 5916139 | Hydraulic system and pump A hydraulic system includes a hydraulic fluid pump, a hydraulic cylinder, and a pressure accumulator. A hydraulic fluid valve is movable between a first position and a second position. In the first position, the valve directs fluid from the pump outlet to... | 06/29/1999 |
| 5569024 | Pump for delivering hot, corrosive media A pump for delivering hot, corrosive material having a shaft seal comprising a seal gap through which hot gases flow, and wherein the sealing gases also flow around the pump bearings for the purpose of cooling the bearings.... | 10/29/1996 |
