Bizarre Patents
A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 7290991 | Dual oil supply pump An automotive engine oil pump assembly having first and second pump mechanisms contained within a common housing. A shaft rotatably supported in the housing drives the pump mechanisms in a conventional manner. The pump mechanisms are offset in phase to reduce flow p... | 11/06/2007 |
| 7114490 | Multiple pump fuel delivery system A multiple pump fuel delivery system is provided, which in one preferred embodiment includes a tank. Mounted within the tank are multiple fuel pumps. The fuel pumps have intakes connected to filters. One pump may be connected to a fuel only passing filter, and anoth... | 10/03/2006 |
| 7090473 | Multiple stage pump with multiple external control valves A multiple stage pump having valves downstream from each respective pump in a same line thereof. The respective lines then merge into a common line. The multiple stage pump prevents pressure variations and shot to shot fuel variations. ... | 08/15/2006 |
| 6994102 | Pressure regulating valve A pressure regulating valve which is comprised of a valve body being comprised of a cylinder, a spool slidably disposed in the cylinder with a clearance, the spool and the cylinder defining a pressure chamber and a space portion, and an urging member which urges the... | 02/07/2006 |
| 6932583 | Multiple stage pump with multiple external control valves A multiple stage pump having valves downstream from each respective pump in a same line thereof. The respective lines then merge into a common line. The multiple stage pump prevents pressure variations. The multiple stage pump includes a first pump in a first stage ... | 08/23/2005 |
| 6869274 | Method of reducing pressure peaks in a fuel injector A multiple stage pump having valves upstream from each respective pump in a same line thereof. The respective lines then merge into a common line. The multiple stage pump prevents pressure variations. The multiple stage pump includes a first pump in a first stage an... | 03/22/2005 |
| 6293765 | Tandem fixed displacement pump with torque control A tandem fixed displacement pump circuit with torque control includes first and second pumps that draw fluid from a reservoir to supply respective load circuits, pressure relief valves for each of the load circuits, and a pilot operated sequence valve tha... | 09/25/2001 |
| 6186750 | Oil pump control valve spool with pilot pressure relief valve A valve spool (70) for an oil pump assembly (10) that includes a pilot pressure relief valve (80) to provide pilot pressure relief that increases the stability of the pump assembly (10) and eliminates the delay between the change in the discharge pressure... | 02/13/2001 |
| 5954484 | Sewage lifting station A sewage lifting station having at least two solid waste collection chambers for receiving pumped solid waste-contaminated sewage. The station has a collection tank for receiving pre-treated waste water flowing from the solid waste collection chambers via... | 09/21/1999 |
| 5722815 | Three stage self regulating gerotor pump A gerotor pump is described for use with non-compressible fluids such as automotive coolant or hydraulic oil. The pump includes three separate pump outlet ports, a bypass return passage, find an integral four position spool valve. Increasing back pressure... | 03/03/1998 |
| 5609474 | Gear pump A gear pump having three gears, including; a pump case consisting of a pump body and a cover for covering most of the body; three gears which are supported by a rotating shaft on the pump case and engaged with each other in series; first and second gear p... | 03/11/1997 |
| 5228289 | Plural hydraulic pump system with unloading valve A pump system is disclosed which operates at high efficency in either a high volume, low pressure mode or a low volume, high pressure mode. First and second internal gear pumps are driven by a common drive shaft. The first pump has a smaller displacment t... | 07/20/1993 |
| 5211026 | Combination lift piston/axial port unloader arrangement for a screw compresser An unloading arrangement for a rotary screw compressor includes discrete and different unloading apparatus associated with the male and female rotors respectively. The unloading apparatus associated with the male rotor is an axial piston continuous unload... | 05/18/1993 |
| 5211544 | Hydraulic pump A constructionally simplified hydraulic pump has two pump elements which discharge from a common suction chamber. The flows can be alternatively fed in common to a pressure outlet or separately to two outlets, one of which outlets leads back into the suct... | 05/18/1993 |
| 5199854 | Hydraulic supply arrangement for use with active automotive suspension or the like The first of two serially arranged electromagnetically operated spool type drain control valves is conditioned to select the drain passage of smaller the pump before the second valve is moved from its closed or communication cut-off position, to its open ... | 04/06/1993 |
| 5087177 | Dual capacity fluid pump A dual capacity pump having at least two gear pump stages with a common fluid inlet passage, each pump stage having a discharge port, the discharge port for one stage communicating with a fluid pressure load through a flow delivery passage and the dischar... | 02/11/1992 |
| 4938666 | Staged unloading of cylinder bank In a compressor having a plurality of banks of cylinders, smaller steps of unloading are achieved by unloading a single cylinder in a bank. When only one cylinder is to be unloaded, gas bypass is used in order to maintain a closer balance of forces in the... | 07/03/1990 |
| 4850813 | Self unloading pump circuit for an automatic transmission having multiple pressure supply pumps A pump and regulator valve assembly having multiple pump and multiple regulator valve means that establish pressures of two or more operating pressure levels in a control system wherein the valve means has multiple valves that selectively respond to varyi... | 07/25/1989 |
| 4832579 | Plural hydraulic pump system with automatic displacement control and pressure relief valve A pump system is disclosed which operates at high efficency in either a high volume, low pressure mode or a low volume, high pressure mode. First and second internal gear pumps are driven by a common drive shaft. The first pump has a smaller displacement ... | 05/23/1989 |
| 4743168 | Variable capacity compressor and method of operating A plurality of unloading steps for a compressor are achieved by providing the compressor with at least two cylinders having different displacements. By unloading different cylinders, the compressor output is better able to match system demand.... | 05/10/1988 |
| 4609330 | Modular unloading sequencing switching valve assembly for hydraulic system An improved unloading and sequencing control valve for a two pump hydraulic system is adapted to be mounted directly onto the bearing carrier of a two section gear pump or at a remote location and connected to the pumps by plumbing and is capable of opera... | 09/02/1986 |
| 4591317 | Dual pump controls Controls for a dual element pump having first and second pumps with separate outputs wherein a modulating valve is positionable to control the amount of fuel delivered by a first pump to a fuel control and additionally to selectively control the utilizati... | 05/27/1986 |
| 4538966 | Oil pump assembly An oil pump assembly comprises a pump body assembly composed of a pair of front and rear pump bodies, the rear pump body housing in a pump housing space a pair of pumps each including a pump cartridge having a rotor supported on a common drive shaft rotat... | 09/03/1985 |
| 4514147 | Controlled valving for a dual pump system The control valving for a dual pump hydraulic system has two regulator valves which control the distribution of pressurized fluid, on a priority basis, to a high pressure system, a low pressure system and a lube system. One regulator valve controls flow f... | 04/30/1985 |
| 4502845 | Multistage gear pump and control valve arrangement There is disclosed a multistage gear pump and control valve arrangement comprising two hydraulic gear pump sets each having a suction port connected to a common sump and a discharge port for delivering hydraulic fluid to a circuit line. Only one of the di... | 03/05/1985 |
| 4445818 | Apparatus for supplying hydraulic fluid A flow path switching valve is provided, operating to merge hydraulic fluid from a plurality of pumps in accordance with a magnitude of a loading applied to a hydraulic unit, and a variable orifice is defined adjacent to the valve. A flow control valve is... | 05/01/1984 |
| 4412789 | Oil pump unit To supply hydraulic fluid to a hydraulic apparatus, a plurality of pumps are used. One of the pumps is used as a main pump while the remaining pump or pumps are used as sub-pumps. A flow path switching mechanism selectively disconnects the sub-pumps from ... | 11/01/1983 |
| 4381904 | Hydraulic power pack A hydraulic power pack for supplying hydraulic fluid under pressure for operating apparatus such as hydraulic workover units used in servicing oil and gas wells. The power pack provides substantially constant hydraulic power input to the driven apparatus ... | 05/03/1983 |
| 4373866 | Process to control the delivery of a single screw compressor A process to control the delivery of a single screw compressor comprising a screw meshing with two pinion wheels and rotatable inside a casing. A channel with obturating means is provided to connect the high pressure orifice pertaining to a one pinion-whe... | 02/15/1983 |
| 4245964 | Efficiency fluid pumping system including sequential unloading of a plurality of pumps by a single pressure responsive control valve In a fluid pumping system in which a fluid is pumped from a fluid supply to a load, two continuously driven fixed displacement pumps are operated in parallel to provide the pumping action. The two pumps are arranged with a common inlet, and with a common ... | 01/20/1981 |
| 4204811 | Fluid pumping system A fluid pumping system comprises a fluid pump having multiple fluid outlet flows coupled to relatively low and high pressure loads. A control valve system controls the pressure levels of the low and high pressure flows, and relieves excess fluid from the ... | 05/27/1980 |
| 4199943 | Fluid transmission circuit A fluid transmission circuit in which three or more pumps, adapted to be driven in unison by a prime mover operating at constant power output, draw fluid from a reservoir and deliver it to a reversible fluid motor via a control valve incorporating forward... | 04/29/1980 |
| 4183723 | Rotary vane pump having multi-independent outputs due to stator surfaces of different contour A vane-type double lobe hydraulic pump having a casing with a rotor having a plurality of slots with each slot mounting a vane for tracking of a surrounding cam ring and porting for pumping from both undervane and intervane pumping chambers. The cam ring ... | 01/15/1980 |
| 4142842 | Dual source hydraulic steering system A method and plural embodiments of apparatus for delivering a pressure-compensated supply of fluid to a hydraulic steering circuit, wherein first and second pumps are respectively operated by a vehicle engine and by a ground wheel when the vehicle is in m... | 03/06/1979 |
| 4097198 | Internal combustion assisted hydraulic engine This hydraulic engine utilizes two sets of hydraulic cylinders connected to a shaft so as to be alternately pressurized as the shaft is reciprocally driven by a pair of conventional internal combustion chambers. The outlets of all hydraulic cylinders are ... | 06/27/1978 |
| 3995974 | Internal combustion assisted hydraulic engine This hydraulic engine utilizes two sets of hydraulic cylinders connected to a shaft so as to be alternately pressurized as the shaft is reciprocally driven by a pair of conventional internal combustion chambers. The outlets of all hydraulic cylinders are ... | 12/07/1976 |
| 3994628 | Multiple recirculating toilet A pumping system for a plurality of recirculating toilets sharing a common tank is described. A variable volume pump has a by-pass valve which is controlled by a pressure sensor in the flush line, to prevent excessive fluid pressure at the toilets. For ap... | 11/30/1976 |
