Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 8186155 | Hydraulic energy storage system with accumulator and method of varying charge of same A method of varying a charge in an accumulator includes providing an accumulator containing working fluid and gas, providing a reservoir containing gas, transferring gas from the reservoir to the accumulator to increase the gas pressure in the accumulator, and trans... | 05/29/2012 |
| 8186154 | Rotary flow control valve with energy recovery A hydraulic circuit is provided having a hydraulic actuator and a flow control valve. The flow control valve has a pressure adjusting element fluidly coupled to the hydraulic actuator and situated to affect a pressure of fluid being directed to the hydraulic actuato... | 05/29/2012 |
| 8151563 | Hydraulic drive system The present invention relates to a hydraulic drive system for driving an apparatus, with a drive unit, a first and a second hydraulic displacement machine, with which the drive unit is connectable or connected for transmitting mechanical energy, and a third and a fo... | 04/10/2012 |
| 8087240 | Control apparatus for work machine A speed of a hydraulic actuator is matched with that of an electric actuator when the hydraulic actuator and the electric actuator are concurrently actuated. When determination units (71, 72) determine that a boom hydraulic cylinder (31) and a rotation... | 01/03/2012 |
| 8024924 | Drive having an energy recovery and retarder function The invention relates to a drive with an energy recovery and retarder function. The drive (1) comprises a hydrostatic piston engine (12) which is connected to an accumulator (16) for storing pressure energy and to a pressure limiting valve (1... | 09/27/2011 |
| 7980073 | Hybrid system for a powertrain and hydraulic system A hybrid system for a machine is disclosed. The system has a pump configured to generate fluid flow within a hydraulic system and a first actuator actuated by fluid pressurized by the pump. The system also has a first motor configured to be selectively actuated by p... | 07/19/2011 |
| 7908852 | Control system for recovering swing motor kinetic energy This disclosure relates to a hydraulic system and method that converts the kinetic energy generated by the operation of a swing motor into hydraulic potential energy and reuses the hydraulic potential energy for swing motor acceleration. An accumulator can be provid... | 03/22/2011 |
| 7905088 | Energy recovery and reuse techniques for a hydraulic system A hydraulic system has a valve assembly with two workports coupled to chambers of first and second cylinders which are connected mechanically in parallel to a machine component. A separation control valve is connected between first chambers of both cylinders, and a ... | 03/15/2011 |
| 7891181 | Hydraulic unit A hydraulic unit, in particular for lifting and lowering loads in stacking trucks, has at least one working cylinder (10). The piston/rod unit (12) of the cylinder is guided movably in a housing (22). By a hydraulic pump (25), the piston/... | 02/22/2011 |
| 7870727 | Method of controlling a hydrostatic drive A method of controlling a hydrostatic drive is provided. The hydrostatic drive has a hydraulic pump and a hydraulic engine. The hydrostatic drive further has a first and a second hydraulic reservoir for storing and recuperating energy. Pressure energy is stored in t... | 01/18/2011 |
| 7856817 | Hydraulic drive system A hydraulic drive system for an actuator uses a pair of pressure compensated hydraulic machines to control flow to and from the drive chambers of the actuator by varying the controlled pressure of one of the machines. The machines are mechanically coupled to permit ... | 12/28/2010 |
| 7856816 | Hydraulic brake energy regeneration system for electric energy storage and vehicle drive assist A hydraulic drive system for storing and releasing hydraulic fluid includes a high pressure storage device, a low pressure storage device, a pump operating at a range of pump speeds for converting between mechanical energy and hydraulic energy, and a motor operating... | 12/28/2010 |
| 7823379 | Energy recovery and reuse methods for a hydraulic system A method provides several modes for recovering hydraulic energy produced by an overrunning load acting on cylinders connected in parallel to a machine component. In one mode, fluid from first chambers in both cylinders is routed into the accumulator, while other flu... | 11/02/2010 |
| 7793496 | Infinitely variable transmission hydraulic hybrid for on and off highway vehicles An infinitely variable transmission for use with an internal combustion engine is provided. Specifically, a prime mover is provided for driving a first hydraulic machine. The first hydraulic machine is arranged to drive a second hydraulic machine via a fluid line th... | 09/14/2010 |
| 7762066 | Regeneration system A regeneration system for use in a vehicle having a reciprocating-piston engine. The regeneration system captures energy (e.g. braking energy), stores the energy, and subsequently uses the stored energy to generate motive power for the vehicle. The motive power can ... | 07/27/2010 |
| 7712309 | Arrangement and a method for controlling a work vehicle An arrangement for controlling a work vehicle includes a power source, and a hydraulic circuit including a pump driven by the power source, at least one hydraulic actuator arranged in fluid connection with the pump via a first conduit, a variable displacement hydrau... | 05/11/2010 |
| 7673451 | Hydraulic drive system with neutral drift compensation A hydraulic drive system for storing and releasing hydraulic fluid includes a high pressure storage device, a low pressure storage device, and a pump-motor operating at a range of pump-motor speeds for converting between hydraulic energy and mechanical energy. The p... | 03/09/2010 |
| 7669413 | Hybrid construction machine In a hybrid excavator, a hydraulic pump and a generator motor are connected in parallel to an output shaft of an engine and a rotation motor is driven by a battery. The generator motor assists the engine by performing a motor function. Power consumption of each of t... | 03/02/2010 |
| 7669414 | Hydraulic energy recovery system with dual-powered auxiliary hydraulics A power transfer system for a vehicle that comprises a an internal combustion engine, one or more drive wheels, and power transfer apparatus transfers power from the prime mover to the wheels for propelling the vehicle. The system further comprises an auxiliary hydr... | 03/02/2010 |
| 7658065 | Hydraulic system having in-sump energy recovery device A hydraulic energy recovery device for a hydraulic system is disclosed. The hydraulic energy recovery device has a first impeller configured to receive a flow of pressurized liquid, and a second impeller configured to pressurize a flow of liquid. The hydraulic energ... | 02/09/2010 |
| 7634911 | Energy recovery system An energy recovery system for a machine is disclosed. The energy recovery system may have a pump configured to provide a flow of pressurized fluid. The energy recovery system may also have a first fluid actuator with a first chamber and a second chamber and being co... | 12/22/2009 |
| 7614224 | Hydraulic system for industrial vehicle A hydraulic circuit of a hybrid type industrial vehicle drivable by an engine and an electric motor is disclosed. A generator motor is driven by the engine and generates electricity. A cargo handling hydraulic pump is actuated in conjunction with an operation of the... | 11/10/2009 |
| 7565801 | Swing drive device and work machine A swing control circuit is provided separately from a hydraulic actuator control circuit. The swing control circuit includes a swing pump motor connected to closed circuits of a swing motor through a solenoid valve that serves as a directional control valve. A swing... | 07/28/2009 |
| 7516613 | Hydraulic drive system A hydraulic drive system for an actuator uses a pair of pressure compensated hydraulic machines to control flow to and from the drive chambers of the actuator by varying the controlled pressure of one of the machines. The machines are mechanically coupled to permit ... | 04/14/2009 |
| 7472546 | Regenerative braking system for a work machine A regenerative braking system for a work machine includes a ground driven hydraulic pump coupled to a drive system, the ground driven hydraulic pump being configured to absorb shaft power from the drive system by converting the shaft power into a hydraulic flow, and... | 01/06/2009 |
| 7444809 | Hydraulic regeneration system A hydraulic system for a work machine is provided. The hydraulic regeneration system has a tank, a primary source, a first actuator, an accumulator, and a first valve mechanism. The tank is configured to hold a supply of fluid. The primary source is configured to pr... | 11/04/2008 |
| 7444808 | Hydraulic system The invention concerns a hydraulic system comprising at least one hydraulic drive means (1), a conduit system (10) connected to the hydraulic drive means for conveying hydraulic liquid to and from the hydraulic drive means, where the conduit system com... | 11/04/2008 |
| 7441406 | Fluid circuit and industrial truck having a fluid circuit The invention relates to a fluid circuit for load displacement, having a fluid supply line for conveying fluid from a fluid tank by means of a fluid pump to at least one fluid store of a consumer, and having a fluid return line, through which fluid can be returned, ... | 10/28/2008 |
| 7434391 | Excavator and a machine for material transfer The invention relates to an excavator or to a machine for material transfer comprising an element movable via at least one hydraulic cylinder. In accordance with the invention, one or more hydraulic cylinders are additionally hinged to the element, with the addition... | 10/14/2008 |
| 7409826 | Compact hydrostatic energy recuperation system and method of operation A compact hydrostatic energy recuperation system comprises hydrostatic converter with first and second pump-motors, which shafts fastened by coupling. The first pump-motor having greater displacement volume associated with the machinery working equipment hydraulic s... | 08/12/2008 |
| 7401464 | Energy regeneration system for machines First and second displacement variable regenerating hydraulic motors are provided in third and fourth flow rate control lines which function as discharge flow paths for oil discharged, respectively, from first and second oil supply and discharge ports of a hydraulic... | 07/22/2008 |
| 7387182 | Turbine generator regenerative braking system A turbine generator regenerative braking system may be used to slow or stop a rotating shaft or wheel, wherein energy may be recovered as electricity generated by a turbine generator and stored in batteries, ultra-capacitors, or other storage systems. The turbine ge... | 06/17/2008 |
| 7374005 | Opposing pump/motors Two motors are arranged on opposing sides of a common shaft, drive plates of the pump/motors being rigidly coupled to each other, for example by being in hard contact with opposing sides of the shaft. By providing hard contact between the pump/motor drive plates and... | 05/20/2008 |
| 7363754 | Mowing machine A control system for a trimmer head assembly includes a first arm including a first mowing device, a first cylinder connected to the first arm, a source of fluid in selective communication with the first cylinder via a fluid line, and an accumulator in selective com... | 04/29/2008 |
| 7337869 | Hydraulic hybrid vehicle with integrated hydraulic drive module and four-wheel-drive, and method of operation thereof A vehicle includes an integrated drive module coupled to an axle thereof. The module includes a hydraulic motor configured to provide motive power at an output shaft, and a differential for distributing the motive power to right and left portions of the axle. The hy... | 03/04/2008 |
| 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 |
| 7318489 | Hydraulic motor arrangement and method of operating a hydraulic motor A hydraulic motor for use in subterranean drilling operations in which a drive fluid within a first reservoir is forced through the motor by a high pressure working fluid, such as drilling mud, the drive fluid entering a second reservoir upon exiting the motor. Upon... | 01/15/2008 |
| 7315089 | Powertrain system comprising compressed air engine and method comprising same A powertrain system comprises a compressed air supply apparatus, a compressed air engine, a rotary power conversion apparatus and an electrical power conversion apparatus. The compressed air engine is configured for extracting energy from compressed air. The compres... | 01/01/2008 |
| 7296407 | Hydraulic service module A hydraulic service module is provided for a hydraulic fluid system, which includes a fluid reservoir for storing an appropriate amount of a hydraulic fluid. The hydraulic service module comprises an outer casing defining an enclosure therewithin including an air ch... | 11/20/2007 |
| 7293670 | Upper block A crane having an upper block, a lower block, a drum, and two ropes. The upper block includes an equalizer having a yoke to which the ropes are connected. The connections between the ropes and the yoke include load cells that measure the forces carried by each of th... | 11/13/2007 |
