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| Number | Title | Issue Date |
| 7555978 | Hydraulic actuating device Hydraulic actuating device comprising a first and a second hydraulic actuator, which actuators have a first and a second connection for the supply and discharge of hydraulic fluid, which connections are in communication with a first and a second chamber, respectivel... | 07/07/2009 |
| 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 |
| 7415919 | Series hydraulic circuit for controlling operation of multiple cutting decks of a tractor A series hydraulic circuit for permitting motorized operation and independent control of a plurality of cutting decks of a mower. The circuit allows separate operation of one of the decks while enabling operation of one or more of the other decks associated with the... | 08/26/2008 |
| 7412919 | Hydraulic force control system for clamping assembly A hydraulic force control system is disclosed for controlling the clamping force applied to a load by the clamp arms of a clamping attachment of a load-lifting vehicle to prevent the arms from over- or under-clamping the load. The system includes a force control cir... | 08/19/2008 |
| 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 |
| 7207525 | Apparatus for grasping objects in space A remotely controlled apparatus for grasping an object such as a satellite in space includes a free-flying grasper unit connected by a selectively extendable cable to an orbital platform. The orbital platform and the grasper unit are preferably each independently pr... | 04/24/2007 |
| 7168192 | Driving device, particularly a lifting device for a working vehicle The invention concerns a driving device, particularly a lifting device for a working vehicle, with a hydraulic drive, in the form of a motor with a first connection and a second connection, a pump, a control valve arrangement between the pump and the drive, and an o... | 01/30/2007 |
| 7127888 | Hydraulic drive unit A hydraulic drive unit is provided with a boom cylinder, an arm cylinder, a communication line communicating a rod chamber of the boom cylinder and a bottom chamber of the arm cylinder with each other, and a switching valve arranged on the communication line for com... | 10/31/2006 |
| 7047735 | Increasing hydraulic flow to tractor attachments Hydraulic flow to tractor attachments such as a sweeper, snow thrower, breaker, auger or cold planer may be increased by diverting pressurized hydraulic fluid from the auxiliary pump. A diverter valve between the auxiliary pump and the auxiliary circuit of the loade... | 05/23/2006 |
| 6986303 | Displacement shift valve and pumping apparatus and methods using such a valve Apparatus and methods are provided for pumping concrete using a pumping apparatus including first and second drive cylinders, a valve, and a pump. Fluid is delivered into the cylinders from the pump to reciprocate pistons within the cylinders. Pressure within the cy... | 01/17/2006 |
| 6832806 | Hydraulic actuating device, in particular for a convertible-top assembly of a vehicle The present invention relates to a hydraulic actuating device for a device having a first and a second hydraulically moveable component. This actuating device comprises a first and a second hydraulic actuator, respectively, for moving the first and second moveable c... | 12/21/2004 |
| 6811000 | Volumetric operating system for vehicle lifts A description is provided of a volumetric operating system (10) for scissors-type vehicle lifts, comprising a plurality of cylinders (16, 18, 20, 22) for movement of the vehicle lifting runways (12, 14), of which the main cylinders (16, 22 | 11/02/2004 |
| 6659192 | Hydraulic lift device for an attaching device A hydraulic lift device for an attaching device of a tractor which has a hydraulic pressure supply device and a hydraulic tank, comprising for each of two lower steering arms, a double acting hydraulic cylinder having a cylinder housing, a piston rod, a p... | 12/09/2003 |
| 6571679 | Driving mechanism for moving two objects simultaneously and reciprocatingly in opposite directions A wood splitting apparatus has a parting blade and a platen which undergo reciprocating motions in mutually opposite directions by means of a pair of hydraulic cylinders. After the parting blade splits off a portion of a sawn log horizontally, the portion... | 06/03/2003 |
| 6561751 | Actuator control device and bucket posture control device for hydraulic drive machine A high versatility can be obtained, the pipe laying can be configured easily and, by virtue of the fact that a pilot pressured oil is managed, a hydraulic apparatus can be compacted. A differential pressure ƊP between a pressure of the pressured oil on a... | 05/13/2003 |
| 6460862 | Chuck with rotary vane actuator There is provided a chuck having four radial jaw grooves, two pairs of opposed jaws movably provided in the grooves, a first rotary vane actuator for actuating one pair of the opposed jaws, and a second rotary actuator for actuating the other pair of the ... | 10/08/2002 |
| 6073886 | Constant pressure area telescoping piston and method of using same An actuator assembly that has a constant net pressure area telescoping piston. The actuator assembly has a cylindrical housing; nesting, telescoping pistons; a central plug; an outer cap; and a vent. The cylindrical housing has an interior surface and a b... | 06/13/2000 |
| 6035909 | Hydraulic drive for a feller-buncher An apparatus for felling and bunching trees is disclosed. The apparatus includes a front frame and a front axle supported by the front frame. The apparatus further includes a number of front wheels mounted on the front axle and a work tool supported by th... | 03/14/2000 |
| 6029446 | Multifunction valve stack A power machine has a base, an operator support portion, and a hydraulic slew motor coupled to move the operator support portion relative to the base. A boom, an arm, and a tool are all coupled to one another and to the operator support portion and are po... | 02/29/2000 |
| 6029559 | Telescoping system with multiple single-stage telescopic cylinders The telescoping system includes a first fluid motor and a second fluid motor. The first fluid motor includes a first extension chamber and a first retraction chamber, and the second fluid motor includes a second extension chamber and a second retraction c... | 02/29/2000 |
| 6003313 | High pressure to low pressure exchange system for hydraulic drives A boom and drive train hydraulic system is described having a pressure source, preferably a pump operated by a motor, said pressure source providing hydraulic fluid at a high pressure to a first set of valves used to operate the drive train of the system.... | 12/21/1999 |
| 6000315 | Lift control for implement frame Frame sections on an implement are supported above the ground by lift wheel assemblies having positive mechanical depth stops and series connected lift cylinders. A pressure responsive bypass valve is installed in series with an orifice between the ports ... | 12/14/1999 |
| 5960628 | Hydraulically powered fan and power steering in vehicle A hydraulic system for use in an automotive vehicle. A source of hydraulic pressure selectively operates in two modes. In one mode, it feeds a radiator cooling fan and a power steering system in parallel when a system pressure or flow exceeds a predetermi... | 10/05/1999 |
| 5946911 | Fluid control system for powering vehicle accessories A fluid control system for powering vehicle accessories includes a pump for generating a supply flow of hydraulic fluid, and a supply line for receiving the supply flow of hydraulic fluid. The system further includes a fan control circuit in fluid communi... | 09/07/1999 |
| 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 |
| 5797310 | Dual self level valve A self-leveling system controlling a boom (13) and a bucket (15) by double acting cylinders (17, 19). The system includes a self leveling valve assembly (27) including a first valve section (27a) including a flow divider spool (41) whereby flow from the r... | 08/25/1998 |
| 5794438 | Adaptive fluid motor feedback control A regenerative adaptive fluid motor position feedback control system integrating a load adaptive fluid motor position feedback control system and a load adaptive energy regenerating system having an energy accumulator. The fluid motor control system inclu... | 08/18/1998 |
| 5669282 | Hydraulic circuit for actuating materials handling machine The hydraulic circuit of the invention includes first and second directional control valves 13, 15, each shiftable between three positions. Hydraulic circuit extending from the second directional control valve 15 and a second cylinder 7 to a first cylinde... | 09/23/1997 |
| 5623861 | Pneumatic cylinder and control valve therefor A pneumatic cylinder, especially for a spot-welding machine, has a sleeve valve mounted on the piston rod. The sleeve valve provides a venting valve for dumping pressure from a return chamber at the end of the forward stroke, and a progressive restrictor ... | 04/29/1997 |
| 5520443 | Series hydraulic circuit tailgate locking mechanism A tailgate locking apparatus for a refuse container comprises first and second locking cylinders for locking the tailgate in the closed position. The first and second locking cylinders are movable between a tailgate locked position and a tailgate unlocked... | 05/28/1996 |
| 5499684 | Geographic surface altering implement control system A tilt angle control system has first and second sensors for sensing the position of the rod end portion of first and second lift jacks. A controller calculates an actual tilt angle of an implement connected to the rod end portions of the lift jacks based... | 03/19/1996 |
| 5447094 | Hydraulic system for bucket self-leveling during raising and lowering of boom A hydraulic system having a first bucket leveling circuit for controlling leveling of the bucket during raising of the boom and a second bucket leveling circuit for controlling leveling of the bucket during lowering of the boom. The second bucket leveling... | 09/05/1995 |
| 5410944 | Telescoping robot arm with spherical joints A telescoping robot arm with singularity-free three degrees of motion freedom spherical joints is disclosed. The telescoping section and spherical joints are hydraulically operated to achieve a high power-to-weight ratio and use conventional seals of the ... | 05/02/1995 |
| 5378104 | Apparatus for lifting a large roll of paper A device for raising and lowering a paper roll used in a printing press. This device is comprised of an inverted U-shaped frame made up of a horizontal member supported by two vertical members. Two hydraulic cylinders are supported by the horizontal membe... | 01/03/1995 |
| 5335499 | Multiple hydraulic actuators with series/parallel operation The present invention includes a method for improving operating efficiency of a hydraulic actuator loop and an improved hydraulic actuator loop. The method includes transferring hydraulic fluid between a first and a second hydraulic actuator when the actu... | 08/09/1994 |
| 5249502 | Double action, dual speed and force hydraulic actuators A hydraulic fluid Pressure-operated actuator comprises a first cylinder assembly having an output which operatively carries a second cylinder assembly such that an axial output force is effected from an output shaft of the second cylinder assembly, the ou... | 10/05/1993 |
| 5247871 | Combined pneumatic-hydraulic press head with high actuation speed The combined pneumatic-hydraulic press head includes a body inside which a substantially cylindrical main chamber is defined; the chamber accommodates a main piston and a secondary piston so that they can slide along an axial direction. The main piston ha... | 09/28/1993 |
| 5247870 | Combined pneumatic-hydraulic press with controlled stroke The combined pneumatic-hydraulic press with controlled stroke, includes a body inside which a substantially cylindrical main chamber is defined; the main chamber accommodates, so that it can slide along an axial direction, a working piston which protrudes... | 09/28/1993 |
| 5174191 | Pneumatically actuatable linear drive for automatic spot welding machines A pneumatically actuatable linear drive for automatic spot welding machines includes a cylinder, a piston rod with segments and pistons and an intermediate bottom between the pistons for dividing the cylinder into pressure chambers. An axial conduit in th... | 12/29/1992 |
| 5161822 | Tilt correction system The invention concerns a tilt correction system with at least one pair of cylinder and piston assemblies which are hydraulically operated. The extent of tilt correction is limited by grooves internal to the cylinders of the assemblies which short hydrauli... | 11/10/1992 |
