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| Number | Title | Issue Date |
| 8091467 | Hydraulic valve circuit with damage-control override Hydraulic valve circuits capable of variably limiting respective maximum hydraulic pressures at which an assembly of bidirectional hydraulic power devices can move respective clamping members, such as forks or clamp arms, selectively in a closing movement toward eac... | 01/10/2012 |
| 7434393 | Control system and method for supplying pressure means to at least two hydraulic consumers Disclosed are a control arrangement and a method for the pressure medium supply of at least two hydraulic consumers that are supplied with pressure medium through the intermediary of a variable displacement pump. In the pressure medium flow path between the consumer... | 10/14/2008 |
| 7434394 | Hydraulic drive device To permit using hold-side pressure oil in a first hydraulic cylinder for the acceleration of a second hydraulic cylinder upon performing a combined operation of the first and second hydraulic cylinders, a hydraulic drive system is provided with a main hydraulic pump... | 10/14/2008 |
| 7204186 | Fluid circuit for feeding primary and auxiliary users with preset priorities Fluid-dynamic circuit for supplying primary and auxiliary uses with preset priorities comprises a pressurised fluid source, at least one first use with primary priority, at least one second use with secondary priority, at least one third use with low priority; said ... | 04/17/2007 |
| 7017460 | Method and arrangement for adjusting feed rate of a crosscut saw A method and arrangement for adjusting a feed rate of a crosscut saw (1), in particular, in a harvesting head of a forest machine during the crosscutting of wood (9) in the apparatus. A feed force (F) of the crosscut saw and/or a rotating rate (vc... | 03/28/2006 |
| 6959728 | Rotary cam valve A multiple fluid flow controller valve device having radially disposed a number of valves and a central rotary shaft with cam surfaces functioning as the valve controller to open and close the valves in the desired sequence. ... | 11/01/2005 |
| 6955115 | Hydraulic circuit having pressure equalization during regeneration A fluid system is provided wherein two different fluid circuits are connected in parallel with a single source of pressurized fluid and the two fluid circuits can function together even when one of the loads is lighter than the other. This is accomplished by having ... | 10/18/2005 |
| 6685138 | Augmenting flight control surface actuation system and method Apparatus for providing actuation power to an aircraft flight control surface. The apparatus includes a first actuator and a second actuator, where the second actuator has a bypass mode and an assist mode. The mode of the second actuator is determined by ... | 02/03/2004 |
| 6659531 | Rebalancing circuit for a truck cover sliding pivot A hydraulic circuit comprises first and second cylinders, and a piston disposed in each of the cylinders. A pump communicates with one side of one of the pistons, and a pressure relief valve has a position wherein the pump communicates with another side o... | 12/09/2003 |
| 6631880 | Preventative stop valve system and method A preventative stop valve system for a wheeled trailer carrying hydraulic equipment is disclosed comprising a stop valve fitted for insertion in-line into the hydraulic line servicing the trailer equipment; the stop valve comprising a reciprocating piston... | 10/14/2003 |
| 6520593 | Hydraulic positioning system In the operation of a work machine attachment of the type utilizing fluid cylinders, it is desirable provide a way to conveniently operate each of the fluid cylinders while locating any hydraulic conduits required to operate the fluid cylinders away from ... | 02/18/2003 |
| 6438953 | Control device for hydraulic drive machine A first object of the present invention is to make do with a simple hydraulic circuit, which does not utilize a pressure compensation valve, and to enable the use of an inexpensive, low-precision pressure detector, to enable the maintenance of continuous ... | 08/27/2002 |
| 6223530 | Control device for hydraulic power cylinders The invention relates to a control device for hydraulic power cylinders, in particular power cylinders of a road truck tailgate, comprising a hydraulic pump (1) driven by a motor (M). Said pump can be connected to a supply of medium and, via pump branch p... | 05/01/2001 |
| 6082106 | Hydraulic device A hydraulic device comprises a variable displacement pump, a plurality of hydraulic actuators, a plurality of directional valves capable of controlling the delivery oil flowing into each of the actuators, a plurality of pressure compensation valves which ... | 07/04/2000 |
| 5946910 | Hydraulic circuit for hydraulically driven working vehicle The present invention relates to a hydraulic circuit for a hydraulically driven working vehicle which allows the vehicle to travel at an almost constant speed during high-speed traveling, provides a great digging force during working, does not need a char... | 09/07/1999 |
| 5937729 | Hydraulic emergency control for transmission ratio-dependent variation of the hydraulic oil pressure in the hydraulic conical pulley axial adjustment mechanisms of a continuously variable transmission A hydraulic emergency control system for a continuous looped gear type continuously variable transmission (10) includes first and second hydraulic beveled conical pulley axial actuators controlling a gear ratio. A pump supplies a first piston chamber (13)... | 08/17/1999 |
| 5845494 | Lift control method A lift having a freight-receiving table which is rotatably supported by one or more each of hydraulic lift and tilt cylinders for respectively lifting and tilting the table is controlled such that an overloaded condition of the table is detected by measur... | 12/08/1998 |
| 5819534 | Articulated aerial device with hydraulic upper boom compensation An aerial lift unit is truck mounted. The lift includes a lower boom pivoted to the truck and an upper boom pivotally connected to the outer end of the first boom. A lower boom cylinder unit is connected to pivot and thereby raise and lower the lower boom... | 10/13/1998 |
| 5813312 | Hydraulic control apparatus A hydraulic control apparatus having two groups and formed by combination of actuator circuits on large flow rate side (a boom cylinder circuit and an arm cylinder circuit) and actuator circuits on small flow rate side (a bucket cylinder circuit and a rot... | 09/29/1998 |
| 5794510 | Pressurized fluid feed system A pressurized fluid feed system including a pressure compensating valve and directional control valve disposed between a hydraulic pump and a boom cylinder, and a pressure compensating valve and a directional control valve disposed between the hydraulic p... | 08/18/1998 |
| 5724878 | Hydraulic operating mechanism for a convertible top In a hydraulic operating mechanism for a convertible top, a pressure sensor (12) is incorporated into a common pressure circuit (P) of the hydraulic cylinders (1 through 4) and connected with a control unit which is connected to the switching elements (V1... | 03/10/1998 |
| 5687568 | Hydraulic motor system A hydraulic motor system minimizes wasted power by using a plurality of fixed displacement hydraulic motors to drive a drive shaft in a cooperative manner. The motors are selectively switched into operation in response to variations in fluid pressure. As ... | 11/18/1997 |
| 5561978 | Hydraulic motor system A hydraulic motor system minimizes wasted power by using a plurality of fixed displacement hydraulic motors to drive a drive shaft in a cooperative manner. The motors are selectively switched into operation in response to variations in fluid pressure. As ... | 10/08/1996 |
| 5560387 | Hydraulic flow priority system A control system is provided for a hydraulic circuit having first and second hydraulic valves, a valve spool position sensor, and first and second input devices for producing first and second operation signals. A controller receives a signal from the valv... | 10/01/1996 |
| 5558004 | Control arrangement for at least one hydraulic consumer A control arrangement for at least one hydraulic consumer in which the consumer can be controlled with respect to direction and speed via a directional control valve device, in which two consumer lines lead from the directional control valve device to the... | 09/24/1996 |
| 5546750 | Hydraulic circuit for pressure-controlling a hydraulic distributor of the open-center type A control device provides a reliable way of pressure controlling a hydraulic distributor and an associated first hydraulic circuit when pressurized hydraulic fluid is simultaneously supplied to at least one other hydraulic circuit. Pilot pressure oil ente... | 08/20/1996 |
| 5535663 | Operating valve assembly with pressure compensation valve An operating valve assembly incorporates a pressure compensation valve and is capable of contributing down-sizing of a hydraulic circuit. The valve assembly includes an operating valve, compensation valves and a load pressure detecting portion. A valve bo... | 07/16/1996 |
| 5533334 | Pressurized fluid supply system A pressurized fluid supply system, in which a plurality of pressure compensation valves are connected to a pump discharge line of a hydraulic pump in parallel, and direction control valves are provided at the outlet side of each pressure compensation valv... | 07/09/1996 |
| 5487403 | Variable discharge pump with low unload to secondary A load sensed variable output gear pump system including a pump within a housing, an inlet passage extending to a pump inlet and an outlet passage extending from a pump outlet. A secondary outlet passage is located in the housing and a bypass outlet passa... | 01/30/1996 |
| 5481872 | Hydraulic circuit for operating plural actuators and its pressure compensating valve and maximum load pressure detector Simultaneous operation efficiency in a case where a plurality of actuators are operated by one or a plurality of hydraulic pumps is improved. A delivery pressure passage (1a) of one hydraulic pump (1) and that (1a) of the other hydraulic pump (1) communic... | 01/09/1996 |
| 5477678 | Hydraulic circuit system In a hydraulic circuit system, when pressurized oil discharged from a single hydraulic pump is supplied to a plurality of actuators: the pressurized oil is supplied to heavily-loaded ones of the actuators at gradually reducing flow rates to reduce a shock... | 12/26/1995 |
| 5471837 | Hydraulic system using multiple substantially identical valve assemblies A hydraulic control system is designed to permit the use of a plurality of small substantially identical existing valve assemblies in place of a lesser number of larger valve assemblies. In one embodiment, a first pair of variable displacement load sensin... | 12/05/1995 |
| 5458049 | Two-stage externally adjustable control valve Material such as trash or refuse is packed in a container by opposed hydraulic packing and ejecting cylinders. Each cylinder is controlled by a hydraulic control valve with the control valve controlling the ejecting cylinder being, in effect, operated by ... | 10/17/1995 |
| 5442912 | Hydraulic recovery device A hydraulic recovery device in a hydraulic system having a pump (1) driving a plurality of actuators through a plurality of control valves (2, 3), the hydraulic recovery device comprising a variable resistance valve (6, 60) in a first line being controlle... | 08/22/1995 |
| 5435132 | Method and flow control valve assembly for flow balancing The invention relates to a method for, in a hydrostatic transmission having a preferably variable displacement hydraulic pump (P) feeding a number of hydraulic motors (M1, M2, M3, M4) provided in association with respective drive wheels, drive tracks or c... | 07/25/1995 |
| 5421155 | Hydraulic drive system for hydraulic working machines A hydraulic drive system for hydraulic working machines has a variable displacement hydraulic pump, at least one actuator driven by the hydraulic fluid, a directional control valve of center bypass type for controlling the flow of the hydraulic fluid, a c... | 06/06/1995 |
| 5415199 | Unit for controlling a plurality of hydraulic actuators Hydraulic actuators are fed by a single flow-rate generator, each being connected to it through a proportional directional valve, the unit including a device for detecting the highest of the pressures prevailing upstream of the throttle provided by a cont... | 05/16/1995 |
| 5398505 | Fluid pressure driving system A fluid pressure driving system for a vehicle includes a reservoir tank in which an amount of fluid is stored, a variable capacity oil pump sucking the fluid from the reservoir tank and discharging the resultant fluid, a control device for adjusting a qua... | 03/21/1995 |
| 5394697 | Hydraulic drive system An unloading valve is connected to a hydraulic pump, the unloading valve being opened when a differential pressure between a delivery pressure of the hydraulic pump and a maximum load pressure exceeds a predetermined value, for discharging a part of a flo... | 03/07/1995 |
| 5383390 | Multi-variable control of multi-degree of freedom linkages The present invention provides an apparatus for controllably actuating a work implement. The work implement includes at least a first linkage and a second linkage. The apparatus produces a control signal, senses the position and velocity of the first and ... | 01/24/1995 |
