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| Number | Title | Issue Date |
| 7401467 | Pump assembly for hand fork-lift truck Pump assembly for the lift cylinder of a hand fork-lift truck includes a piston pump activated by a bar of a hand fork-lift truck and has a piston chamber and an annulus collector. A three stage control valve connects the lift cylinder with a tank in the lowered set... | 07/22/2008 |
| 7165439 | Battery powered hydraulic tool A battery powered hydraulic tool including a frame; a battery connected to the frame; a motor connected to the frame and adapted to be powered by the battery; and a hydraulic pump connected to the motor by a gear reduction transmission. The motor and gear reduction ... | 01/23/2007 |
| 7111488 | Battery powered hydraulic tool A battery powered hydraulic tool including a frame; a battery connected to the frame; a motor connected to the frame and adapted to be powered by the battery; and a hydraulic pump connected to the motor by a gear reduction transmission. The motor and gear reduction ... | 09/26/2006 |
| 7100897 | Hydraulic jack Disclosed is a jack lever, in which oil is pumped by piston (10) to move a cylinder (20) faster, vacuum being created at a lower portion of the cylinder (20) moving up, oil in an oil tank (101) being then flowed in the lower portion throu... | 09/05/2006 |
| 7051686 | Variable volume valve for a combustion powered tool A variable volume metering chamber and valve assembly for a combustion-powered tool includes a housing defining a metering chamber having an internal volume and including an inlet and an outlet, and a plunger configured for reciprocal movement relative to the chambe... | 05/30/2006 |
| 7040091 | Multilevel speed regulation jack A multilevel speed regulation jack includes an input oil cylinder, an output oil cylinder, and a fluid conduit member between the cylinders. The output oil cylinder includes a cylinder body containing an annular space and a tube piston, which fits in the annular spa... | 05/09/2006 |
| 7007447 | Actuator device with a multi-chamber housing An actuator device self-contained within a housing and adapted to move an object. The actuator device includes a movable piston positioned in a cylinder portion of the housing. The cylinder portion defines a longitudinal axis, whereby the piston is movable along the... | 03/07/2006 |
| 6957560 | Battery powered hydraulic tool A battery powered hydraulic tool including a frame; a battery connected to the frame; a motor connected to the frame and adapted to be powered by the battery; and a hydraulic pump connected to the motor by a gear reduction transmission. The motor and gear reduction ... | 10/25/2005 |
| 6748740 | Multilevel speed regulation jack and method of operation A multilevel speed regulation method for a jack and a multilevel speed regulation jack use a hydraulic speed regulation line which includes at least two parallel hydraulic sub-lines extending between the input and output cylinders and the pressure applied by the out... | 06/15/2004 |
| 6742334 | Speed regulation jack and method of operation A speed regulation jack comprises at least one input cylinder and one output cylinder, and parallel hydraulic lines between the input and output cylinders. A differential oil circuit is connected between the inlet cavity and the return cavity of the output cylinder,... | 06/01/2004 |
| 6732514 | Hydraulic jack with dual pump system A hydraulic jack with dual pump system includes two fluid reservoirs, two pumps for pumping the hydraulic fluid from the fluid reservoirs to an inner fluid chamber of a hydraulic cylinder respectively, and two sequence valves each opening at a predetermined control ... | 05/11/2004 |
| 6247307 | Hydraulic raising apparatus with automatic regulated speeds A hydraulic raising apparatus with automatic regulated speeds can automatically adapt its raising speeds for various load conditions. It mainly comprises additional hydraulic circuits, check valves and adjustable relief valves arranged between the piston ... | 06/19/2001 |
| 6240726 | Hydraulic jack device A hydraulic jack device has a pump, a handle, a hydraulic cylinder, a rocking arm, and a lifting seat. A hydraulic shaft is inserted through the hydraulic cylinder and connected to the rocking arm. The rocking arm is connected to the lifting seat. The pum... | 06/05/2001 |
| 6199379 | Oil circuit of a jack for rising object to preset position rapidly An oil circuit of a jack for rising an object to a preset position rapidly, wherein the oil inlet circuit of a hydraulic loop system is improved. An oil channel is installed between the inner oil chamber of the piston rod and the sequential valve. A check... | 03/13/2001 |
| 6035635 | Hydraulic quick lifting unit of a jack The invention relates to an improved hydraulic quick lifting unit used in a jack, especially to improvements made on the valves of the hydraulic system, a fastener assembly and an oil return tube of the lifting shaft. The hydraulic system can return hydra... | 03/14/2000 |
| 5992149 | Control unit for hand-operated hydraulic jack A control unit for hand-operated hydraulic jack comprises a control handle (1), a small hand-operated pump (2), a lifting cylinder (4), an inlet pipe and an outlet pipe, wherein the inlet pipe of said lifting cylinder (4) is connected with the small hand-... | 11/30/1999 |
| 5979215 | Hydraulic tool with rapid ram advance A hydraulic tool having a frame, a conduit system in the frame, a pump in the conduit system, a ram movably connected to the frame, and a mechanical actuator provided in the conduit system for contacting a rear end of the ram. The conduit system is adapte... | 11/09/1999 |
| 5937647 | Hydraulic circuit system for one-touch jack and its structure A hydraulic circuit system for one-touch jack and its structure has an inlet circuit, a return circuit and an overload protection circuit with a hydraulic cylinder, a piston rod, a sequence valve, a safety valve and a relief valve, in which the inlet circ... | 08/17/1999 |
| 5802850 | Hydraulic machine having an improved air bag A portable punching machine is disclosed which has a hydraulic, single acting, spring return cylinder for linearly moving a punch toward and away from a die. The cylinder is driven in turn by a hydraulic pump disposed in a fluid chamber built into the mac... | 09/08/1998 |
| 5755099 | Hydraulic circuit system for one-touch jack and its structure A hydraulic circuit system for one-touch jack and its structure has an inlet circuit, a return circuit and an overload protection circuit with a hydraulic cylinder, a piston rod, a sequence valve, a safety valve and a relief valve, in which the inlet circ... | 05/26/1998 |
| 5417065 | Oil pressure device of jack An oil pressure device for a jack whereby a hydraulic jack is adapted to raise rapidly until the lifting portion of the jack reaches a load sufficient to overcome a spring operating force, at which point the operation of the jack shifts to a slower, more ... | 05/23/1995 |
| 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 |
| 5212951 | Hydraulic elevator control valve According to the invention, a valve for use with a variable speed motor and pump in an hydraulic elevator balances a fluid pressure force on a pump side of a control valve with a fluid pressure force on a cylinder side of the control valve before an eleva... | 05/25/1993 |
| 4947672 | Hydraulic compression tool having an improved relief and release valve A valve for use in a hydraulic compression tool. The valve has a frame with a central chamber, a first inlet, a second inlet and a discharged outlet. A first gate is located at the first inlet. A plunger assembly having a first plunger member and a second... | 08/14/1990 |
| 4796461 | Hydraulic crimping tool The hydraulic crimping tool includes a piston follower mechanism to provide an automatically sequentially reduced crimping force and extent of crimping deformation in predetermined manner in dependence on the extent of travel of a movable crimping jaw tow... | 01/10/1989 |
| 4621496 | Actuator control system An actuator control system is disclosed using fluid dispensing means to selectively add or remove fluid from a closed actuator system, whereby the movement of the actuator is volume rather than pressure responsive.... | 11/11/1986 |
| 4509723 | Portable hydraulic lifting jack A portable hydraulic lifting jack for automobiles comprising a ram cylinder receiving a ram therein, and a plunger cylinder receiving a plunger therein so that the lift head may be hydraulically lifted as the plunger is pumped by a lever, wherein a socket... | 04/09/1985 |
| 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 |
| 4445554 | Log splitter A log splitter wherein a wedge having a cutting edge and a hydraulic power unit are arranged on one and the other ends of an I beam horizontally supported by supports, is disclosed. A log to be split is placed on the I beam between the wedge and the hydra... | 05/01/1984 |
| 4342216 | Limited stroke force delivering tool A hydraulic force-delivering hand tool, such as a cable crimper, comprising a body with a large axial bore at one end forming a cylinder. A piston is slidable in the cylinder and has a nodular mass at the outer end to drive against a member to be crimped.... | 08/03/1982 |
| 4339942 | Hydraulically operated crimping tool A hydraulically operated crimping tool (1) for attaching an electrical connector to an electrical conductor, consisting of a hydraulic oil reservoir (27), which is connected to a pump unit (26) which when operated will pump oil under pressure into an encl... | 07/20/1982 |
| 4284113 | Hydraulic log splitter A manually operated log splitter is provided. The log splitter comprises a bi-ended main beam, a splitter wedge fixed at one end of the main beam, and manually operated hydraulic power means fixed to the other end of the beam. In accordance with the inven... | 08/18/1981 |
| 4263801 | Hydraulic riveter A hydraulic tool comprising a cylinder which is open at one end with a piston extending partially therein, but having a substantial portion extending outside. A lateral bore through the extending portion accommodates intake and exhaust check valves, but t... | 04/28/1981 |
| 4248077 | Jaw for riveter In a hydraulic riveter wherein an extension on a piston carries a jaw holder containing an annular array of gripping segments with conical outer surfaces slidable on a conical inner surface of the holder, a second piston is slidable in a bore and is opera... | 02/03/1981 |
| 4151720 | Manually operable hydraulic actuator A manually operable hydraulic actuator which utilizes a main pump and an auxiliary pump to quickly develop a relatively large useful hydraulic force, for example, in applying compression accessories to stranded conductors such as cables. The main pump dev... | 05/01/1979 |
| 4119000 | Remote control assembly An improved remote control assembly for mechanically controlling the operation of a hydrostatic pump which may be used to power the attachments on a tractor-like vehicle. The assembly includes a first control unit positioned at a first remote location on ... | 10/10/1978 |
| 3931711 | Controller assembly An improved controller assembly is utilized in a hydrostatic steering system having an engine driven pump with a servomotor which is effective to vary the displacement of the pump upon operation of a pressure responsive valve assembly. The controller asse... | 01/13/1976 |
