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| Number | Title | Issue Date |
| 7318292 | Method and device for attenuating the motion of hydraulic cylinders of mobile work machinery The present invention relates to a method for attenuating the motion of hydraulic cylinders of mobile work machinery, in particular of hydraulic excavators, in which prior to the hydraulic cylinder reaching one of the limits of travel, its motion speed is reduced, a... | 01/15/2008 |
| 6386346 | Brake valve device for industrial vehicles A spool-out type booster brake valve device for industrial vehicles is configured to allow hydraulic working fluid to be supplied not only to a booster chamber but also to a master chamber thereby eliminating the need to use a separate brake fluid reservo... | 05/14/2002 |
| 6363712 | Gas-driven microturbine A microturbine fabricated by a three-level semiconductor batch-fabrication process based on polysilicon surface-micromachining. The microturbine comprises microelectromechanical elements formed from three polysilicon multi-layer surfaces applied to a sili... | 04/02/2002 |
| 6256986 | Hydrostatic drive system A hydrostatic drive system with a pump and at least one consuming device that is connected to the pump can be actuated by a control valve. The control valve can be actuated as a function of an actuator that specifies a desired speed of movement and a dire... | 07/10/2001 |
| 5913810 | Position maintenance device for the shaft of a hydraulic cylinder The maintenance device consists of a hydraulic insulation unit (2) mounted between the supply circuits of a cylinder (1). The insulation unit (2) comprises a sluice (9) which has, at each of its two openings, an anti-return valve, one of which, the primar... | 06/22/1999 |
| 5305681 | Hydraulic control apparatus An apparatus for controllably actuating a hydraulic actuator is provided. The apparatus is connected between a source of pressurized hydraulic fluid and the hydraulic actuator. The apparatus controllably provides pressurized hydraulic fluid to the hydraul... | 04/26/1994 |
| 5261234 | Hydraulic control apparatus An apparatus for controllably actuating a hydraulic actuator is provided. The apparatus is connected between a source of pressurized hydraulic fluid and the hydraulic actuator. The apparatus controllably provides pressurized hydraulic fluid to the hydraul... | 11/16/1993 |
| 5138838 | Hydraulic circuit and control system therefor Hydraulic control of reversible hydraulic motors typically requires several different valves to provide for the various operating parameters. The subject hydraulic control circuit has only a pair of electrohydraulic control valves to provide all the typic... | 08/18/1992 |
| 4914913 | Load responsive flow amplified control system for power steering Flow amplified control systems are useful in pilot operated steering systems. The load responsive flow amplified control system includes a directional control valve movable to an operating position to direct fluid from the operating fluid circuit through ... | 04/10/1990 |
| 4779419 | Adjustable flow limiting pressure compensated flow control A pressure-compensated flow-control valve with an adjustable limiting device controls the maximum speed of a fluid motor and eliminates an additional valving element found in prior art device. The flow control valve includes a flow limiting throttle openi... | 10/25/1988 |
| 4492080 | Tractor hydraulic control systems A tractor hydraulic control system of the kind comprising a power lift with a hydraulic actuator (12) and a main control valve (17) controlling the supply of fluid from a pump (19) to the actuator, the system including selector valve means (50) interconne... | 01/08/1985 |
| 4197705 | Hydraulic control system A hydraulic control system is provided including a fluid reservoir, a variable displacement pump having a fluid input in fluid communication with the reservoir and having a fluid output, and a fluid actuated displacement control mechanism for controlling ... | 04/15/1980 |
| 4178962 | Control valve with flow control means An open center type control valve for a hydraulic motor, wherein pressure fluid from a source is caused to flow from the valve inlet to a motor port at a substantially uniformly metered rate despite fluctuations in the load on the governed fluid motor, du... | 12/18/1979 |
| 4096694 | Control system for a fluid drive A fluid drive assembly has a pump, a variable displacement motor, a fluid circuit connecting the pump to the motor, and an actuator device for controlling the displacement of the motor. The actuator device is movable between a first position at which the ... | 06/27/1978 |
| 4050248 | Control device for hydrostatic drive, especially for fork lift truck A control device for a hydrostatic drive, especially for a fork lift truck, in which an engine drives a reversible variable delivery pump which supplies fluid to a fluid motor connected to the drive wheels of the lift truck. A reversible actuator is conne... | 09/27/1977 |
| 4040255 | Control system for a hydraulically actuated device such as the vibrator motor of a self-propelled vibratory compactor For automatically terminating the operation of the vibrator in a self-propelled roller compactor when the vehicle is at rest or travelling slowly, a variable displacement pump driving the hydraulic motor of the vibrator is provided with a servo control me... | 08/09/1977 |
| 3998134 | Load responsive fluid control valves A load responsive direction and flow control valve for use in fluid power load responsive system. The valve maintains a selected constant flow level for control of both positive and negative loads, irrespective of the change in the load magnitude or chang... | 12/21/1976 |
| 3937129 | Load responsive system with area change flow extender A load-responsive hydraulic system is provided in which the effective output of a fixed displacement pump is controlled by a bypass valve having three fluid-responsive areas. The first fluid-responsive area is pressurized by pump pressure; and the directi... | 02/10/1976 |
