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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 |
| 7281374 | Hydraulic device for elevating/lowering chair A chair elevating/lowering hydraulic device includes at least a foot pump 3 which absorbs oil by an ascent of an operation lever 1, which discharges oil stored by a stepping-on of the operation lever, and which discharges stored oil by a stepping-on of... | 10/16/2007 |
| 6993905 | Oil hydraulic cylinder An oil hydraulic cylinder configured to allow an object to be smoothly and continuously lifted without being clatteringly swayed and unnecessarily rotated by the oil hydraulic while supply of the oil hydraulic remains uninterrupted when an adjusting lever is manipul... | 02/07/2006 |
| 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 |
| 6295812 | Hydraulic jack A hydraulic jack includes a moveable base seat. A lift arm, a handle and a hydraulic driver each mounted on the base seat. The hydraulic driver is driven by the handle to push the lift arm to lift an object. The hydraulic jack has a compound piston assemb... | 10/02/2001 |
| 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 |
| 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 |
| 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 |
| 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 |
| 5433127 | Multi-functional jack handle There is here disclosed a multi-functional cylindrically shaped jack handle with a solid first end characterized by the presence of a centrally located notched out slot for receipt of flat release screws on hydraulic jacks, a first shoulder in proximity t... | 07/18/1995 |
| 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 |
| 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 |
| 4577463 | Pallet truck with hydraulic lift A pallet truck hydraulic jack has a base plate mounting a lift cylinder with a reciprocal piston or lift rod and a pump cylinder with a reciprocal pump piston. A cartridge type directional control valve assembly within the base plate controls the flow of ... | 03/25/1986 |
| 4487019 | Hoisting gear at patient-lifting devices The present invention relates to a hoisting gear for patient-lifting device whereby a plunger device (6) is displaceably mounted in a hydraulic cylinder (4), is supporting patient-carrier means (3) such as a seat or a patient-carrying plate and is raisabl... | 12/11/1984 |
| 4366673 | Hydraulic amplifier A hydraulic amplifier having a hydraulic motor adapted to drive a high pressure pump for boosting the pressure of low pressure fluid and for supplying high pressure fluid to a hydraulic actuator. The motor also drives a scavenging pump for overcoming high... | 01/04/1983 |
| 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 |
| 4144713 | Patient lifting device An improvement in patient lifting devices comprising an upright member, a boom pivotably mounted on the upright member, a fluid cylinder pivotably mounted between the upright member and the boom, and a manually operated pump for the fluid cylinder. The im... | 03/20/1979 |
| 4130991 | Hydraulic pumps An hydraulic pump comprising a plunger slidingly located within a housing. A first valve is adapted to allow fluid to be drawn from a reservoir into the housing during movement of the plunger in one direction, and a second valve is adapted to allow fluid ... | 12/26/1978 |
| 4048800 | Hydraulic jack having rotating pump handle Presented is a hydraulic jack structure having a pump assembly in connection with which is rotatably mounted a pump handle assembly which may be rotated in a horizontal plane through about 320° to permit selective positioning of the handle during a pumpi... | 09/20/1977 |
| 3959970 | Hydraulic jack The present invention relates to a hydraulic jack with a base plate on which are attached a pump cylinder, a jack cylinder, and a reservoir concentrically surrounding the jack cylinder, the reservoir being connected to the pump cylinder by means of a firs... | 06/01/1976 |
