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An armor with rollers is provided that enables a user to move in all positions by rolling on a hard and smooth surface while constantly varying his bearing points on the ground.
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| Number | Title | Issue Date |
| 7752842 | Circuit for controlling a double-action hydraulic drive cylinder Circuit for controlling a double-action hydraulic drive cylinder includes a directional control valve having working ports A and B, a pump port P, and a tank port T, wherein the directional control valve has a neutral position in which pump port P is blocked and wor... | 07/13/2010 |
| 7334403 | Brake valve for a hydraulic transmission The invention relates to control of a hydrostatic gearbox, comprising a hydraulic pump (2), provided for pumping in a first pump-side main line (5a) or a second pump-side main line (6a). The hydrostatic gearbox further comprises a ... | 02/26/2008 |
| 7281376 | Hydraulic hybrid powertrain system A hydraulic hybrid powertrain system includes a power plant generating a high pressure fluid at an output, at least one drive motor responsive to the high pressure fluid for generating rotary motion at an output, and a mode selection device connected to the power pl... | 10/16/2007 |
| 7210292 | Hydraulic system having variable back pressure control A hydraulic system for a work machine having a linkage system is disclosed. The hydraulic system has a tank configured to hold a supply of fluid and at least one hydraulic actuator associated with the linkage system to affect movement of the linkage system. The at l... | 05/01/2007 |
| 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 |
| 6978609 | Electrohydraulic servo door drive for operating a door, a window, etc. The invention pertains to an electrohydraulic servo door drive for operating a door, a window, or the like, with a hold-open function, where a valve is installed in the hydraulic circuit to implement the hold-open function. To create an electrohydraulic servo door d... | 12/27/2005 |
| 6951102 | Velocity based method for controlling a hydraulic system A hydraulic circuit branch includes a hydraulic actuator, such as a cylinder, and an assembly of one or more electrohydraulic proportional valves connected in series between a pressurized fluid supply line and a tank return line. The force acting on the hydraulic ac... | 10/04/2005 |
| 6880332 | Method of selecting a hydraulic metering mode for a function of a velocity based control system The flow of fluid to a hydraulic actuator is controlled by a valve assembly which operates in different metering modes at various points in time. The metering mode to use in selected in response to the hydraulic load that acts on the valve associated with the hydrau... | 04/19/2005 |
| 6718759 | Velocity based method for controlling a hydraulic system A hydraulic circuit branch includes a hydraulic actuator, such as a cylinder, and an assembly of one or more electrohydraulic proportional valves connected in series between a pressurized fluid supply line and a tank return line. The force acting on the hydraulic ac... | 04/13/2004 |
| 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 |
| 6539712 | Hydraulic drive unit A hydraulic drive unit is disclosed which can prevent the occurrence of cavitation at the time of turning OFF of a hydraulic motor without greatly modifying the circuit configuration and the entire system and which, as a result, can improve the decelerati... | 04/01/2003 |
| 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 |
| 6192929 | Hydraulic controller The present invention provides a hydraulic controller comprising: a plurality of switching spools; a plurality of cylinder ports of a switching valve; a compressed oil passage common to the switching valves having an intermediate chambers, at least a chec... | 02/27/2001 |
| 6112521 | Backpressure control circuit for hydraulic drive device The present invention relates to a backpressure control circuit for a hydraulic drive device, which reduces the loss in drive power and which can suppress cavitation. Thus, the backpressure control circuit for hydraulic drive devices is a hydraulic drive ... | 09/05/2000 |
| 5826486 | Hydraulic circuit Cylinder drift resulting from internal leakage of a recycling circuit, which recycles oil returned from the arm cylinder of a hydraulic shovel to the hydraulic supplying end, is reduced by an hydraulic circuit which includes a recycle valve attached direc... | 10/27/1998 |
| 5638679 | Hydraulic valve with dual-mode capability The disclosure relates to a new valve and a hydraulic system incorporating such valve. A mode-selection assembly on the valve is adjustable between an open-loop position for system purging and a closed-loop position for normal system operation. A sealing ... | 06/17/1997 |
| 5590525 | Method of preventing cavitation in an axial piston pump during an aiding load and system and valve employing the same Cavitation in axial piston motors (20) caused to act as a pump by an aiding load (28), and the related difficulty of loss of hydrostatic film (52), and tipping or hammering of motor slippers (64), can be reduced by a method which includes the step of reci... | 01/07/1997 |
| 5444979 | Fluid passage control device for fluid pressure actuator A tilt cylinder for tilting an outboard engine has first and second cylinder chambers. A pair of on/off valves is movably disposed in respective fluid passages connected to a hydraulic pump and the first and second cylinder chambers, respectively. The on/... | 08/29/1995 |
| 5361584 | Hydrostatic drive system A hydrostatic drive system including a pump and a hydraulic motor in an open circuit which includes a feed line and a control valve in the feed line on the inflow side of the hydraulic motor to control the quantity of hydraulic pressure medium supplied to... | 11/08/1994 |
| 5355773 | Hydraulic system for controlling contact pressure A hydraulic system for controlling the contract force of a hydraulic device. A proportional pressure relief valve acts as pilot valve for a main valve that controls the lowering process. The proportional pressure relief valve is provided with a solenoid w... | 10/18/1994 |
| 5191826 | Hydraulic control device In the case of a hydraulic control device for an oscillating load moving system comprising a double-acting hydroconsumer (V), which is adapted to be selectively connected to a pressure source (P) or to a reservoir (T) via two separate main lines (9, 10) a... | 03/09/1993 |
| 5168937 | Drill feed control utilizing a variable overcenter valve An apparatus includes a feed cylinder having a first end port and a second end port. A feed cylinder is located within the feed cylinder and is movable in a drive direction in response to fluid pressure applied to the first end port, and is movable in a r... | 12/08/1992 |
| 5159813 | Slewing control device for crane A slewing control device for a hydraulic slewing crane adapted to supply a discharge oil from a hydraulic pump through a slewing control valve to a slewing motor and control a rotational direction and a rotational speed of the slewing motor. The slewing c... | 11/03/1992 |
| 5140815 | Valve apparatus A hydraulic actuator is driven by hydraulic fluid discharged from a hydraulic pump, for controlling driving of the actuator. A valve has a meter-in circuit for introducing the hydraulic fluid discharged from the hydraulic pump into the actuator. The valve... | 08/25/1992 |
| 5101630 | Braking valve arrangement for a hydrostatic drive The invention relates to a braking valve arrangement for a hydrostatic drive operated in open circuit, in particular for vehicle drives, wherein a hydraulic pressure medium is supplied to the hydraulic motor from the hydraulic pump via a reversing directi... | 04/07/1992 |
| 5097745 | Speed control valve for a hydraulic motor speed controlled by pressure between throttle and motor A control block, having few moving parts and few bores, for the hydraulic drive of an airplane control surface comprises a primary spool valve 2 which is shifted by two electromagnetic valves I, II to determine the direction of rotation of a hydraulic mot... | 03/24/1992 |
| 5033266 | Overcenter valve control system and method for drilling A drill feed control system for controlling the force exerted on a drill string having substantial weight. A feed cylinder, which has a first end and a second end, is connected to the drill string. Fluid is pumped from a reservoir to displace the feed cyl... | 07/23/1991 |
| 5025626 | Cushioned swing circuit Cushioned swing circuits sometimes have a restricted passage between the motor conduits to allow the implement controlled by the swing circuit to coast to a stop. However, opening and closing of the restricted passage was manually controlled, thereby requ... | 06/25/1991 |
| 4930311 | Exhaust and inlet line brake valves for hydrostatic motor The invention relates to a safety arrangement for a controlled drive which is connected to a conduit with impressed pressure. When the safety arrangement responds the machine is separated via shutoff valves from the inlet and outlet and a via a switchover... | 06/05/1990 |
| 4845948 | Hydraulic circuit with a booster circuit for operating the working members of earth-moving machines A hydraulic operating circuit for working members of earth-moving machines includes linear and rotary hydraulic actuators each of which is associated with a respective hydraulic distributor supplied from a principal supply and with a pressure compensator ... | 07/11/1989 |
| 4754603 | Hydraulic-drive system for an intermittent-demand load A prime-mover driven variable-rate pump of relatively great flow capacity is in delivery and return-circuit connection to an intermittently loaded hydraulic motor. A fixed-rate pump of substantially less capacity is continuously driven by the prime-mover,... | 07/05/1988 |
| 4738103 | Hydraulic control circuit for working members of earth-moving machines with centralized braking of the actuators Hydraulic control circuit for working members of earth-moving machines including linear and rotary hydraulic actuators associated with respective hydraulic distributors for the operation of respective working members. The rotary hydraulic actuators with t... | 04/19/1988 |
| 4732076 | Apparatus for the control of a hydromotor A compensating valve arrangement is connected between a throttling direction control valve or proportioning valve which controls fluid flow from a pressure source to a load. The compensating valve is provided with a pressure reducing valve, check valves a... | 03/22/1988 |
| 4466336 | Control valve for hydraulic motor apparatus A counterbalance valve connects a source of hydraulic fluid to a power piston-cylinder unit for positioning and/or holding a load such as a pivoted bucket arm of earth moving equipment. A directional control valve is operable to reverse the supply connect... | 08/21/1984 |
| 4425759 | Hydrostatic drive systems A hydrostatic drive system with an adjustable pump is provided with branch lines from a main delivery line to several consumers, an arbitrarily actuatable switch in each branch line, an adjustable parallel connecting restrictor in each branch line with an... | 01/17/1984 |
| 4367806 | Combined drive and brake mechanism for a wheeled vehicle carriage The mechanism comprises a hydraulic circuit having a power driven pump; a reservoir for hydraulic fluid, and a motor for each wheel or two or more coaxial wheels of the carriage. The motor has a movable driven member therein and ports for the infeed and o... | 01/11/1983 |
| 4343153 | Anti-supercharge pressure valve Means are disclosed for dissipating supercharge pressure in a hydraulic system including a reversible pump (18) directly connected to a hydraulic cylinder (22). Supercharge pressure results from unequal areas on either side of a piston (24) of a single-en... | 08/10/1982 |
| 4338856 | Dual pilot counterbalance valve A counterbalance valve for controlling the flow of fluid from a hydraulic motor when a load is lowered has a pilot operated valve which modulates the flow of pressure fluid to and from a control port connected to main valve poppet to thereby set the openi... | 07/13/1982 |
| 4240255 | Integrated control device for a fluid circuit and applications thereof The device comprises in a body a pressure limiting stage, a second stage constituting a fluid check and retarding valve and piloting means between these two stages. The second stage comprises regulating means which are easily accessible from outside the b... | 12/23/1980 |
