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| Number | Title | Issue Date |
| 8122713 | Hydraulic circuit of a servo-assisted mechanical transmission A hydraulic circuit of a servo-assisted mechanical transmission, which is provided with a number of hydraulic actuators provided with corresponding actuation chambers adapted to be filled with pressurized oil; the hydraulic circuit is provided with: a number of sole... | 02/28/2012 |
| 7845481 | Clutch master cylinder and clutch operating system of vehicle A clutch operating system includes a clutch pedal; a clutch master cylinder that generates hydraulic pressure by operation of the clutch pedal; a clutch release cylinder that operates the clutch by the hydraulic pressure; and a clutch fluid reservoir that stores flu... | 12/07/2010 |
| 7296669 | Simple action actuator with a hydraulic fast-opening valve for controlling a clutch An actuator with a simple function for the control of a friction clutch in the drive train of a motor vehicle having a cylinder/piston unit for generating the contact pressure of the clutch should be fast, inherently safe and nevertheless simple and inexpensive. For... | 11/20/2007 |
| 7281372 | Hydraulic controller and hydraulic drive unit provided with said hydraulic controller A hydraulic controller in which driving sound and the number of parts can be reduced, and a long service life can be realized, and a hydraulic drive unit provided with said hydraulic controller. The hydraulic controller for a hydraulic drive unit includes a housing ... | 10/16/2007 |
| 7198135 | Lifting device, especially lifting platform for motor vehicles A lifting platform for motor vehicles has at least one extendable lifting column that is formed by a tubular jacket and a lifting cylinder unit arranged at least partially therein. The upper end of the lifting cylinder unit supports a load receptacle. The tubular ja... | 04/03/2007 |
| 7198081 | Log splitter A portably log splitter is provided. The log splitter comprises a base having a pair of one-piece side members, and a support member to which the one-piece side members are attached. The support member and the one-piece side members form a seat that is adapted to re... | 04/03/2007 |
| 7194857 | Ventilation valve of hydraulic jack A ventilation valve of a hydraulic jack is dedicated to be mounted at an outer wall of an oil storage tank of a hydraulic jack. The hydraulic jack includes a valve seat, a valve ball, and a cap. When the jack is not operated, a valve hole is opened; the vent of the ... | 03/27/2007 |
| 7171807 | Oil circuitry for two-stage telescoping transmission jack A multi-stage telescoping transmission jack with a high flow, lower pressure air-over-oil pump. ... | 02/06/2007 |
| 7137330 | Vehicle seat adjustment with actuator isolation valves A fluid powered vehicle seat adjustment system comprising a fluid actuator a source of pressurized hydraulic fluid and a controller. The fluid actuator including first and second inlet/outlet conduits, and the controller selectively controlling and directing pressur... | 11/21/2006 |
| 7055317 | Hydraulic module The invention relates to a new type of hydraulic module for actuating at least one hydraulic control element with a hydraulic pump in a housing, with an electric motor fastened to a first housing side for driving the pump, with a tank located on a second housing sid... | 06/06/2006 |
| 6938414 | Hydraulic powered arm system with float control The present invention relates to a hydraulically powered arm system with a hydraulic circuit, which hydraulic circuit (L) comprises a pressure source (6) and a lifting cylinder (1) arranged to an arm which is intended for handling a tool, said hydrauli... | 09/06/2005 |
| 6662559 | Hydraulic actuator The present invention provides a hydraulic actuator suitable for use in marine and other harsh environments. In the presently preferred embodiment, the hydraulic actuator includes a motor that is coupled to a pump assembly that is configured to displace h... | 12/16/2003 |
| 6530220 | Elongated self-contained actuator A hydraulic cylinder in which the cylinder head contains a motor-driven fluid pump, fluid reservoir, and a main control valve for the cylinder. The cylinder includes a transfer tube that extends through the center of the cylinder's piston and terminates w... | 03/11/2003 |
| 6347515 | Hydraulic lift actuating device The invention relates to a drive device for a hydraulic elevator, the device comprising an actuator (1) whose pressure chamber (1a) is connected to a pump (11) via a down duct (15) and via an up duct (16). A pressure accumulator (4) is connected to the do... | 02/19/2002 |
| 6293181 | Control system providing a float condition for a hydraulic cylinder A control system is provided with a float condition to permit a double acting hydraulic cylinder to freely extend or retract in response to external forces acting on the hydraulic cylinder. The system includes a pair of pilot operated poppet valves dispos... | 09/25/2001 |
| 6283009 | Swash plate type hydraulic unit In a swash plate type hydraulic unit for use as a swash plate type hydraulic pump and a hydraulic motor, a plurality of block plates 41 to 45 being divided at split planes extending orthogonal to a cylinder block axis X are soldered ... | 09/04/2001 |
| 5921299 | Firewood splitting machine A firewood splitting machine is composed of a support frame, a cutter mounted on one end of the support frame, an oil pressure cylinder mounted on another end of the support frame, and an oil injecting device mounted in the support frame. The oil pressure... | 07/13/1999 |
| 5746055 | Hydraulic tilt and trim control for marine propulsion A hydraulic tile and trim mechanism for a marine outboard drive that provides a compact assembly and which ensures that contaminants which may enter the hydraulic fluid can accumulate in the fluid reservoir and will not be circulated by the fluid pump. Th... | 05/05/1998 |
| 5560733 | Gas pre-charged mass counterbalancing A system for above grade and below grade installation, for rendering the mass weightless in preparation to being lifted subject to its mass inertia, wherein a pre-charge is applied to the pneumatic end of a pressure accumulator at a pre-set pressure, and ... | 10/01/1996 |
| 5542646 | Hydraulically operated forcing tool The forcing rod of a hydraulically operated tool has thereon intermediate its ends an enlarged-diameter piston head which reciprocates in the bore of a cylinder housing, and divides the bore into a pressure chamber and a reservoir chamber. A hand-operated... | 08/06/1996 |
| 5477882 | Hydraulic systems A hydraulic system 10 provides a positive supply of hydraulic fluid at a controlled pressure to plurality of pumps. The system comprises a fluid reservoir 15 having outlet means to supply fluid to an auxiliary pump 30. A pressure chamber 16 communicates w... | 12/26/1995 |
| 5467599 | Method for reducing seal stiction in a fluid cylinder An apparatus and a method for reducing seal stiction is provided. In the method, a first step provides a fluid cylinder comprising a piston displacably mounted in a housing containing pressurized fluid is provided in the first step. The housing has first ... | 11/21/1995 |
| 5465576 | Vented hydraulic fluid reservoir A hydraulic fluid reservoir contains an extensible bladder which has its exterior exposed to the fluid and its interior vented to the exterior of the reservoir. The interior of the bladder is sealed from the hydraulic fluid in the reservoir. Depletion of ... | 11/14/1995 |
| 5361583 | Pressurized fluid actuation system with variable force and stroke output for use in a surgical instrument A surgical instrument actuation system is provided with a double-acting fluid pressure piston pump and a double-acting fluid actuator. An operating member is connected to the pump piston, and a two-position directional valve communicates between the pump ... | 11/08/1994 |
| 5284321 | Hydraulic jack with single control for actuating hydraulic valve means A hydraulic jack movably supported by a plural casters has a vertically extending hydraulic cylinder with telescoping piston rods, has a load supporting frame at an upper end of the innermost piston rod, and has a reservoir partially filled with hydraulic... | 02/08/1994 |
| 5251445 | Hand operated hydraulic pump having pressurized reservoir within piston An airless hand held hydraulic pump unaffected by gravity continuously maintains pressure on the fluid in a dynamic reservoir chamber to enable pumping into a dynamic pressure chamber for actuating a forcing rod irrespective of the orientation of the pump... | 10/12/1993 |
| 5242272 | Method and device for pumping a liquid at high temperature through a pipe Procedure for pumping liquid at high temperature through a pipe, characterized in that the liquid at high temperature is pressed, by means of a fluid at low temperature that is inert in relation to the liquid at high temperature, away out of a first reser... | 09/07/1993 |
| 5181380 | Hydrostatic operating mode hydraulic actuator preferably for backup operation, and flight control system comprising it An hydraulic actuator composed of a double-acting actuator, a mobile switching member disposed in a housing connected hydraulically to the actuator, two fluid inlet and outlet pipes and a control member adapted to command the mobile switching member to mo... | 01/26/1993 |
| 5109672 | Method and apparatus for cooling and replenishing aircraft hydraulic actuators A system for cooling individual integrated actuator packages (IAPs) positioned throughout the aircraft in a power-by-wire actuation system is disclosed. A low-pressure hydraulic fluid circulates throughout the aircraft to control the temperature of the in... | 05/05/1992 |
| 5044160 | Mechanism for obtaining a motion of translation in a marine environment The disclosed mechanism is designed so as to be impervious and give a motion of translation enabling, for example the driving of a hinged arm. The mechanism has a hydraulic circuit with fluid, a jack associated with a pull-back spring and a pump to bring ... | 09/03/1991 |
| 4987796 | Internal reservoir-defining body for permitting oil expansion within a hydrostatic transmission housing In a hydrostatic transmission, an oil expansion reservoir is formed as an integral part of the hydrostatic transmission housing, providing an extension to the housing chamber which encloses motion transmitting components of the transmission. The reservoir... | 01/29/1991 |
| 4898519 | Deep well solar pump A solar deep well steam pump has a solar collector, a steam boiler in the collector's focus, a deep well bladder pump having an actuating tube and a water delivery tube, and a mechanism periodically injecting steam under pressure from the boiler into the ... | 02/06/1990 |
| 4827719 | Closed hydraulic system with drying means A hydraulic system which includes an auxiliary reservoir having an elastic fluid impervious chamber and apparatus for sealing the elastic fluid impervious chamber with the interior thereof in fluid communication with the inside of an associated fluid rese... | 05/09/1989 |
| 4766728 | Flow matching valve and hydraulic system employing same The flow matching valve disclosed herein incorporates a fill port in addition to the source, load and respective drain ports employed in previous load matching valves. The inclusion of the fill port allows reconfiguration of hydraulic systems to reduce le... | 08/30/1988 |
| 4735048 | Hydraulic tool The hydraulic tool of this invention includes a pressure chamber into which a fluid is pumped. A pump chamber has an inlet port and outlet port at opposite ends thereof and a pump plunger extends into the chamber with an annular space around it. An annula... | 04/05/1988 |
| 4686828 | Hydraulically operated clamshell device The invention contemplates a hydraulically operated twin-cable suspension for a clamshell or the like load-handling device. In a preferred embodiment, a charged accumulator is effectively a counterweight and is the source of all hydraulic fluid needed for... | 08/18/1987 |
| 4581894 | Hydraulic compression apparatus A hydraulic apparatus for converting hydraulic pressure into mechanical movement for operating a tool or other device, operated by a pump block having a bore therein and a moveable plunger disposed within said bore. A cylinder is disposed over the pump bl... | 04/15/1986 |
| 4527580 | Volume control device A volume control device for a sealed reservoir for storing oil under pressure and which supplies oil to a power circuit. The volume control device has an expansible bellows assembly which contracts upon a predetermined increase of volume of oil in the res... | 07/09/1985 |
| 4498293 | Hydraulic log splitter A force-delivering tool such as a log splitter wherein a pusher member carried on a cylinder is forced against a blade carried on a frame to which the piston is secured. The cylinder is driven relative to the piston by means of a reciprocating plunger car... | 02/12/1985 |
| 4449470 | Hydraulic control package for a marine steering system A hydraulic control package or assembly (30) for use in a marine steering system (10) having a steering helm pump (12) with port (14) and starboard (16) fluid outlets and a return inlet (18) for hydraulically actuating a piston (22) in a hydraulic cylinde... | 05/22/1984 |
