Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 7380399 | Static hydraulic continuously variable transmission To provide a short connection hydraulic path structure with a sufficiently large diameter to adequately lower the pressure in a high-pressure hydraulic path while the clutch is off, in a static hydraulic continuously variable transmission for sliding a clutch valve ... | 06/03/2008 |
| 7360358 | Bypass mechanism for a hydraulic drive apparatus A bypass mechanism for a hydraulic apparatus is provided, where a rotatable hydraulic component such as a motor cylinder block is disposed on a running surface and in fluid communication with a closed hydraulic circuit. The hydraulic component is drivingly engaged t... | 04/22/2008 |
| 7325398 | Closed circuit energy recovery system for a work implement A closed circuit hydraulic system includes a fluid reservoir, a hydraulic cylinder having a cylinder rod, a bidirectional variable displacement hydraulic pump that pumps fluid to either extend or retract the cylinder rod on demand, a flow control valve for relieving... | 02/05/2008 |
| 7302798 | Hydraulic system, reservoir and pump suction enhancer for motor vehicle A hydraulic system for a motor vehicle is provided with a pump suction enhancer includes a body section defining a small chamber, a venturi tube passage exposed to the small chamber at an inner end thereof and connected to the suction port of the oil pump, and a noz... | 12/04/2007 |
| 7299891 | Hydraulic drive mechanism for mobile vehicles To make operating a hydraulic drive mechanism above its admissible maximum rotational speed without separating the mechanical connection to the drive wheel possible, the motor (1) is adjusted in displacement to almost no displacement and the pressure-medium s... | 11/27/2007 |
| 7263829 | Pump A hydraulic pump apparatus having an internal sump formed by a housing having an internal portion and an end cap secured to the housing. A rotatable cylinder block is located in the sump and driven by an input shaft extending into the housing. The pump apparatus als... | 09/04/2007 |
| 7225617 | Bypass mechanism for a hydraulic drive apparatus A hydraulic drive apparatus having a center section located in a housing includes a hydraulic pump and motor disposed thereon and in fluid communication with a hydraulic porting system in the center section. The pump is driven by an input shaft extending out of the ... | 06/05/2007 |
| 7191594 | Hydrostatic stepless transmission A hydrostatic stepless transmission comprises a hydraulic pump and a hydraulic motor, at least one of the hydraulic pump and motor being variable in displacement; a closed circuit for fluidly connecting the hydraulic pump and motor to each other therethrough, the cl... | 03/20/2007 |
| 7178336 | Pump A hydraulic pump apparatus having an internal sump formed by a housing having an internal portion and an end cap secured to the housing. A rotatable cylinder block is located in the sump and driven by an input shaft extending into the housing. The pump apparatus als... | 02/20/2007 |
| 7174712 | Hydrostatic transmission bypass linkage Disclosed is a vehicle comprising a transaxle and a bypass mechanism. The transaxle has a plurality of mounting holes for use in attaching the transaxle to the vehicle. Further, the transaxle has at least one mounting hole more than is used to attach the transaxle t... | 02/13/2007 |
| 7168246 | Hydraulic control device for working machine A hydraulic control device for a working machine includes hydraulic actuators, a hydraulic pump which functions as a hydraulic power source, control valves which control the actuators on the basis of operations by an operating unit, a common bleed-off valve which re... | 01/30/2007 |
| 7162869 | Hydraulic system for a work machine A hydraulic system for a work machine is disclosed. The hydraulic system includes a tank adapted to store a supply of fluid and a source of pressurized fluid in fluid communication with the tank. A first hydraulic actuator and a second hydraulic actuator are in flui... | 01/16/2007 |
| 7152403 | Power unit A power unit includes an engine and a static hydraulic continuously variable transmission with a swash plate type hydraulic pump and a hydraulic motor, which are connected via a hydraulic pressure closing circuit. This power unit drives the hydraulic pump to rotate ... | 12/26/2006 |
| 7146811 | Hydrostatic continuously variable transmission In a hydrostatic continuously variable transmission, a hydraulic pump and a hydraulic motor are connected through a hydraulic closed circuit and the capacity of the hydraulic motor is varied to vary the speed continuously. The transmission has a valve spool in a spo... | 12/12/2006 |
| 7127887 | Oil pressure circuit for working machines A joining directional control valve 13 is disposed to supply, to an arm cylinder 4, not only a hydraulic fluid delivered from a first hydraulic pump 1, but also a hydraulic fluid delivered from a second hydraulic pump 2 when an arm direct... | 10/31/2006 |
| 7127890 | Axle driving system An axle driving system which houses in a housing thereof a hydrostatic transmission, axles, and a driving gear train for connecting output means of the hydraulic transmission and axles, so as to transmit power from a driving source to the hydrostatic transmission an... | 10/31/2006 |
| 7124577 | Vehicular steering control device The present invention lowers energy loss while at the same time enhancing the responsiveness of a steering control system. When a steering controller is operated rapidly, the aperture area of a steering flow control valve 4 rapidly increases, and the differen... | 10/24/2006 |
| 7082762 | Pump A pump having a symmetric end cap is disclosed. The end cap is attachable in a first position or a second position wherein the second position is rotated relative to the housing. A trunnion arm extends in a first direction and a system port opens in a first orientat... | 08/01/2006 |
| 7080872 | Wiper replacement A pneumatic windshield clearing system for enhancing the safety of operating a vehicle in difficult environmental circumstances without the distraction of wipers. The pneumatic windshield clearing system includes an air source assembly coupled vehicle, a blower asse... | 07/25/2006 |
| 7051856 | Method and apparatus for applying and releasing a clutch An apparatus for applying and releasing a clutch piston in a clutch cylinder against a return spring includes a fill oil chamber having first and second portions separated by a fill piston. The first portion is in fluid communication with the clutch cylinder through... | 05/30/2006 |
| 7043906 | Hydraulic equipment A hydraulic apparatus realizes the same function as that of a variable discharge pump by regulating a hydraulic device such as a control valve in a state always operated at a substantially constant number of revolutions with a high efficiency regardless of the type ... | 05/16/2006 |
| 7007467 | Bypass for a hydraulic device A bypass mechanism is provided for use in a hydrostatic transmission, to enable the user to open or close a valve between the two pressure sides of the hydraulic circuit of the transmission. An electrical mechanism is positioned to open or close the valve based on a... | 03/07/2006 |
| 6988362 | Hydrostatic stepless transmission A hydrostatic stepless transmission comprises a hydraulic pump and a hydraulic motor, at least one of the hydraulic pump and motor being variable in displacement; a closed circuit for fluidly connecting the hydraulic pump and motor to each other therethrough, the cl... | 01/24/2006 |
| 6938414 | Hydraulic powered arm system with float control The present invention relates to a hydraulically powered arm system with a hydraulic circuit, which hydraulic circuit (L) comprises a pressure source (6) and a lifting cylinder (1) arranged to an arm which is intended for handling a tool, said hydrauli... | 09/06/2005 |
| 6915631 | Forward/backward switching control apparatus for hydraulic drive vehicle, and control method therefor A forward/backward switching control apparatus for a hydraulic drive vehicle that includes the following structures. A variable displacement type hydraulic pump driven by an engine for discharging pressure oil in both directions. An electromagnetic pump inclination ... | 07/12/2005 |
| 6895748 | Hydrostatic transmission having a hydraulic disconnect A hydrostatic transmission including a pump, a motor, and a center section provided with a conduit through which the pump and motor are in fluid communication and a valve. The pump, motor and center section are disposed in a housing having a plurality of walls which... | 05/24/2005 |
| 6871661 | Combination fitting A combination fitting for flow control devices in an automotive power steering system having channels disposed in the fluid receiving end of the fitting. ... | 03/29/2005 |
| 6804958 | Hydrostatic transmission bypass latch A hydrostatic transmission may be placed in a free-wheeling state by rotating a bypass actuator that lifts the motor from a motor running surface whereby hydraulic fluid flows into a transmission cavity. A bypass arm connected to the bypass actuator and to a bypass ... | 10/19/2004 |
| 6799602 | Combination fitting A combination fitting for flow control devices in an automotive power steering system having channels disposed in the fluid receiving in of the fitting. ... | 10/05/2004 |
| 6769249 | Low slip steering system and improved fluid controller therefor A fluid controller (27) for use with a fluid pressure operated device (45) having an inlet (47) and an outlet (49) and defining a fluid leakage path therebetween. The controller (27) includes valving (61) defining a main flu... | 08/03/2004 |
| 6755019 | Bypass mechanism for a hydrostatic transaxle A bypass mechanism for a hydrostatic transaxle comprising a casing in which is carried a hydraulic motor that rotates on a motor running surface of a center section. The bypass mechanism includes a bypass actuator having a first end that extends from the casing and ... | 06/29/2004 |
| 6698198 | Hydrostatic transmission A control apparatus for a hydrostatic device such as a hydrostatic transmission having a rotatable pump and motor mounted in a housing, a moveable swash plate engaged to the pump and a trunnion shaft engaged to one side of the swash plate and extending ou... | 03/02/2004 |
| 6675576 | Hydraulic circuit having a hydraulic motor equipped with a brake for a vehicle suitable for being towed A hydraulic circuit for the hydrostatic transmission of a vehicle, said hydraulic circuit comprising at least one hydraulic motor, two main ducts, a parking brake having brake means, brake release control means suitable for feeding the brake release chamb... | 01/13/2004 |
| 6651427 | Hydrostatic transmission bypass latch A hydrostatic transmission may be placed in a free-wheeling state by rotating a bypass actuator that lifts the motor from a motor running surface whereby hydraulic fluid flows into a transmission cavity. A bypass arm connected to the bypass actuator and t... | 11/25/2003 |
| 6588206 | Method for controlling fluid flow in a hydrostatic transmission A method for providing a bypass for a hydraulic circuit in a hydrostatic transmission enables the user to open or close a bypass between the hydraulic circuit of the transmission and a hydraulic fluid sump. The method uses an electromechanical valve mecha... | 07/08/2003 |
| 6568500 | Steering system shudder control A hydraulic power steering system includes a steering gear having a cylinder, and a piston slidably disposed in the cylinder to divide the cylinder into first and second cavities on opposed sides of the piston. A pair of turn tubes are coupled to the cyli... | 05/27/2003 |
| 6550244 | Axle driving apparatus having an improved hydraulic fluid bypass mechanism A mechanism for bypassing the flow of hydraulic fluid in a hydrostatic transmission comprised of a hydraulic pump and a hydraulic motor in fluid communication through a center section. The mechanism includes a bypass actuator rod that is moved from a firs... | 04/22/2003 |
| 6467264 | Hydraulic circuit with a return line metering valve and method of operation A hydraulic system controls the flow of fluid to and from several functions on a machine. Each function has a valve assembly through which fluid is supplied under pressure from a source to an actuator and through which fluid returns from the actuator to a... | 10/22/2002 |
| 6453668 | Transmission with cold start valve A transmission with a mechanical cold start valve that dumps the pump output to the suction side of the pump to prevent oil pressure build up and thereby prevent pump toque loads from being applied to the engine during engine cranking. The oil eventually ... | 09/24/2002 |
| 6449948 | Hydraulic circuit cleaning apparatus and method A hydraulic circuit cleaning apparatus has a hydraulic circuit that includes an oil pump, an oil passage to which the oil pressure ejected from the oil pump is supplied, and a pressure regulator device connected to the oil passage for regulating the oil p... | 09/17/2002 |
