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| Number | Title | Issue Date |
| 7401466 | Hydraulic drive, in particular for two-cylinder thick matter pumps The invention relates to a hydraulic drive, especially for two-cylinder thick matter pumps. Said hydraulic drive comprises at least one main pump (10) embodied as a hydraulic variable displacement pump, and two hydraulically actuatable drive cylinders (20,... | 07/22/2008 |
| 7353649 | Hydraulic pressure supply control in industrial vehicle A priority flow rate control valve (30) distributes pressurized working oil discharged from a hydraulic pump (10) driven by an electric motor (11) to a power steering device (20) first, and distributes the residual pressurized working oil... | 04/08/2008 |
| 7316111 | Multi-purpose hydraulic system A hydraulic system including a first pump, a second pump, an auxiliary passage, and a supplemental apparatus. The first pump is in fluid communication with a first valve, and the second pump is in fluid communication with a second valve. The auxiliary passage is in ... | 01/08/2008 |
| 7175001 | Apparatus for driving raising and lowering of lift for tower type storehouse There is provided an apparatus for driving the raising and lowering of a lift for a tower type storehouse so as to supply a force for vertically operating the lift carrying goods to storerooms on every floor of the storehouse, and more particularly to an apparatus f... | 02/13/2007 |
| 7032332 | Method of controlling a backhoe An electronic control for damping oscillation of a swinging backhoe assembly includes a crossover valve that connects the hydraulic lines that supply hydraulic fluid to the boom swing cylinders to each other whenever an electronic controller senses incipient oscilla... | 04/25/2006 |
| 6968908 | Power tools Power tool (11) may include a motor and oil pulse unit (22) that generates an elevated torque. Oil pulse unit (22) may be coupled to the motor and have output shaft (18). When load acting on output shaft (18) is less than a predete... | 11/29/2005 |
| 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 |
| 6581378 | Valve device for hydraulic engine for driving a large flywheel mass A valve device (10) for at least one hydraulic motor suitable for driving a mass of large inertia. The device includes first and second ducts (12, 14) serving to be connected to respective ones of the two main ducts (feed or discharge) of the motor, and a... | 06/24/2003 |
| 6314726 | Apparatus and method for driving a hydraulic system of a construction machine, in particular a hydraulic excavator A method and an apparatus for driving a hydraulic system of a construction machine, in particular a hydraulic excavator, having a plurality of control blocks which are fed via at least one pump each and each drive a plurality of hydraulically operated act... | 11/13/2001 |
| 6295913 | Air operated hydraulic torque wrench pump A hydraulic pump assembly (10) for powering a hydraulic torque wrench (24) is air-powered and has hydro-pneumatic control circuitry (39) which continues operation of an air motor (18) which drives the hydraulic pump (16) for a post-advance period after an... | 10/02/2001 |
| 6241420 | Control system for a vibratory compactor A fluid control system (50) is provided for a work machine (10) having first and second compacting drums (14,16). First and second hydraulic motors (28,32) are connected in series and power first and second vibratory mechanisms (26,30) located within the ... | 06/05/2001 |
| 5782158 | Air operated hydraulic torque wrench pump A hydraulic pump assembly for powering a hydraulic torque wrench is air-powered and has hydro-pneumatic control circuitry which continues operation of an air motor which drives the hydraulic pump for a post-advance period after an advance actuator is deac... | 07/21/1998 |
| 5709083 | Hydraulic swing motor deceleration control A hydraulic deceleration control for a hydraulic motor includes a pilot operated control valve for controlling fluid flow through a pair of motor lines connected to the opposite sides of the hydraulic motor. A valve device is disposed to communicate a sou... | 01/20/1998 |
| 5375983 | Expanding fluid pressure system A system for utilizing the expansion of water as the water is transformed from a liquid state to a solid state includes a rigid outer container and a flexible inner bladder received centrally within the outer container. Hydraulic fluid is received within ... | 12/27/1994 |
| 5375418 | Controlled convertible top hydraulic lock A vehicle convertible top is moved by hydraulic cylinders between extreme raised and lowered positions. The cylinder ends are connected to ports in a reversible hydraulic pump in one end of an elongated housing, which has a reservoir in the other end, sep... | 12/27/1994 |
| 5170627 | Gas cylinder control system A gas cylinder control system for use with machine systems such as die stamping systems that includes at least one gaseous fluid cylinder associated with the machine system, gaseous intensifier control cylinder normally operated in timed relation to the g... | 12/15/1992 |
| 5097857 | Electro-hydraulic valve-actuator system An electro-hydraulic valve-actuator system (30) includes an electric motor (58) for driving a hydraulic pump (60), with an electrical control circuit (68) energizing the electric motor to thereby furnish hydraulic fluid to a valve actuator (16). A timer (... | 03/24/1992 |
| 4951466 | Warm-up control for transmission hydrostatic unit To inhibit potentially damaging cold startup of a hydrostatic unit in a vehicle transmission, a portion of the makeup fluid pump to the hydraulic pump and motor loop circuit of the hydrostatic unit is directed through a branch line including a viscosity i... | 08/28/1990 |
| 4769989 | Device for controlling the pressure in the auxiliary-pressure supply system of a brake unit A device for controlling the pressure in an auxiliary-pressure supply system of a hydraulic brake unit for automotive vehicles, which device comprises a diaphragm-type or bladder-type accumulator equipped with a hydraulic and electric switching arrangemen... | 09/13/1988 |
| 4549400 | Electro-hydraulic engine throttle control An electroresponsive device is energized to actuate an internal combustion engine throttle for switching the engine from idle to a higher speed. The engine drives a hydraulic pump that supplies fluid through a control valve, then a cylinder lock, for driv... | 10/29/1985 |
| 4381731 | Hydraulic power system for a plurality of operating units in a poultry of livestock confinement house The hydraulic power system includes a single electrical motor for driving a fluid pump which supplies fluid under pressure to a plurality of series connected fluid motors, with the first motor in the series directly to the pump outlet and the last motor i... | 05/03/1983 |
| 4369625 | Drive system for construction machinery and method of controlling hydraulic circuit means thereof A drive system for construction machinery in which hydraulic circuit is provided with a plurality of variable-displacement hydraulic pumps and a plurality of hydraulic actuators, each pump being connected in closed circuit to one or a plurality of the act... | 01/25/1983 |
| 4111101 | Apparatus for closing guide vanes of a hydraulic machine An apparatus for closing the guide vanes of a water turbine, for example, by means of a servo-motor controlled by a distributing valve responsive to the variation in the speed of the water turbine. The closing speed of the servo-motor is controlled to var... | 09/05/1978 |
