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| Number | Title | Issue Date |
| 7066003 | Hydraulic tool with rapid ram advance A hydraulic tool including a frame having a hydraulic conduit system; a ram movably connected to the frame; and a multi-speed ram advancement system for advancing the ram in at least two different rates of movement on the frame. The multi-speed ram advancement syste... | 06/27/2006 |
| 6957533 | Operation device The invention relates to a device for opening of doors. Electromechanical systems contain many expensive components and are thereby expensive to manufacture. Installed electromechanical systems are expensive in operation by virtue of the high and energy-demanding fr... | 10/25/2005 |
| 6923431 | Three-shift lifting mechanism for jack or the like A three-shift lifting mechanism includes a hydraulic device disposed at the front side of a valve block and adapted to lift a lifting tube to raise weights, the hydraulic device defining an oil accumulation chamber, a rapid-lifting oil chamber for rapid lifting of t... | 08/02/2005 |
| 6823673 | Lower control system regulating the flow rate of lifting jack oil A lower control system serves to regulate the flow rate of lifting jack oil, and is installed between a reverse flow valve and an inner oil chamber, regulates the oil flow from the inner chamber to an outer chamber. The lower control system comprises an outer valve ... | 11/30/2004 |
| 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 |
| 6622485 | Manually operated zero-load rapid lifting hydraulic jack A manually operated zero-load rapid lifting hydraulic jack. The jack has a lifting arm and a lever which are connected properly together by contacting one another. A lifting arm is formed with an integral receiver portion, which could be in the form of a ... | 09/23/2003 |
| 6546725 | Hydraulic jack and a hydraulic circuit for such a hydraulic jack A continuously auto lifting and lowering hydraulic jack comprises a base, an oil pump, working oil cylinder, a piston, an oil box, an accumulator, a two-position and two-way valve, a dual-controlling check, a pressure-set check and other checks. The two-p... | 04/15/2003 |
| 6405531 | Jack A jack has a first oil cylinder, an inner cylinder disposed in the first oil cylinder, an upper cover covering the first oil cylinder and the inner cylinder, a piston and a piston rod inserted in the inner cylinder, the piston connected to the piston rod,... | 06/18/2002 |
| 6385969 | Arrangement for hydraulic actuation of a movable component on a vehicle An apparatus for hydraulic actuation of a movable component on a vehicle, for example a trunk lid, a cover or the like, includes at least one double-action hydraulic working cylinder (1) which is attached on one side to the vehicle and on the other side t... | 05/14/2002 |
| 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 |
| 6220026 | Active control system Active control system for a movable member, in particular a tailgate or door, includes a pump unit which is connected by at least one fluid connecting line to a piston-cylinder unit. The control system has an on-off valve through which the direction of mo... | 04/24/2001 |
| 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 |
| 6152715 | Pressure clamped hydraulic pump A pump assembly comprises a hydraulic fluid pump having a housing assembled from a plurality of housing components that are pinned together rather than being clamped together by bolts. The pump is disposed in a cavity in a valve block so that the outlet f... | 11/28/2000 |
| 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 |
| 5988989 | Compact hydraulic power unit having a reservoir closed by a manifold having a hydraulic circuit A hydrualic power unit for an auto-hoist lift having a more compact motor and improved noise characteristics. The power unit having a reservoir with a closed end and an open end. A manifold attached to the open end and having an inlet port and an outlet p... | 11/23/1999 |
| 5887431 | Oil cylinder for a stand carriage An oil cylinder has a valve body, an oil pressure chamber, and an oil storage chamber. A shaft extends from the oil pressure chamber. The valve body has a piston chamber, an arc-shaped through hole, an enlarged hole receiving a rotating post, a first oil ... | 03/30/1999 |
| 5823748 | Device for opening and closing a closure cap The invention concerns a device for opening and closing a closure cap (16) fitted over a cleaning aperture (10) in the floor of the discharge container (12) of a pump (14) for thick-bodies fluids. The cap (16) is linked to a hydraulic drive unit (20) and ... | 10/20/1998 |
| 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 |
| 5215178 | Safety valve for discharge chutes on cement mixer A safety valve which prevents the discharge chute from rapidly falling due to a sudden loss of hydraulic fluid pressure. The valve is located between the chute lift cylinder port and hydraulic system hose. The valve is actuated when the flow leaving the c... | 06/01/1993 |
| 5107679 | Safety valve for discharge chutes on cement mixer A safety valve which prevents the discharge chute from rapidly falling due to a sudden loss of hydraulic fluid pressure. The valve is located between the chute lift cylinder port and hydraulic system hose. The valve is actuated when the flow leaving the c... | 04/28/1992 |
| 5012898 | Control system for vehicle lift racks A control system for the hydraulic operating circuit associated with a vehicle lifting device in which the circuit is provided with pressure fluid control valves and flow sensors which are operative on the vehicle lowering cycle to establish substantial e... | 05/07/1991 |
| 4689957 | Hydraulic tool system A system of hydraulic tools utilizing removably, replaceable and substantially interchangeable valve assemblies, fluid reservoirs and hydraulic driving mechanisms. The fluid reservoir maintains the hydraulic fluid under moderate pressure. The valve assemb... | 09/01/1987 |
| 4644849 | Locking apparatus of inertial mass drive hydraulic circuit system An apparatus for locking of an inertial mass drive hydraulic circuit system having a hydraulic pump, an actuator driven by the hydraulic pump for driving a relatively large inertial mass, and a directional control valve mounted in line connecting the hydr... | 02/24/1987 |
| 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 |
| 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 |
| 4285126 | Hydraulically actuated apparatus A multipurpose, hydraulically actuated apparatus comprising a piston movable in response to fluid under pressure within walls defining a piston chamber. Actuating fluid is supplied to the piston chamber by a uniquely constructed hand operated fluid pump. ... | 08/25/1981 |
| 4206603 | Single hand operated tool A single hand held and operated tool comprising a housing; a hydraulic fluid reservoir located in the housing; a hydraulic pressure cylinder located in the housing; a hydraulic piston moving with respect to the pressure cylinder in response to hydraulic p... | 06/10/1980 |
| 4171616 | Hydraulic emergency hand tools The specification discloses a hydraulic pressure operated emergency hand tool of the type in which manual pressure exerted on an all position small-area pump piston creates a hydraulic pressure which is communicated to a power cylinder for activating a pl... | 10/23/1979 |
| 4159105 | Shock absorber with adjustable spring load A device for modifying a shock absorber so that the preload of the shock absorber spring may be adjusted. The device has a chamber member having a cylindrical inner member with an inside diameter slightly larger than the outside diameter of the shock abso... | 06/26/1979 |
| 4149381 | Single hand operated tool A single-hand operated tool comprising: first and second relatively movable elements adapted to be associated with a head assembly for application of pressure to a workpiece; a housing; a hydraulic pump disposed within the housing; hydraulic fluid communi... | 04/17/1979 |
| 4136521 | Multi-purpose portable hydraulic unit The unit comprises outer and inner coaxial cylinders defining an hydraulic fluid reservoir between the inner walls of the outer cylinder and the outer walls of the inner cylinder. The opposite ends of the cylinders are closed off by a lower closure means ... | 01/30/1979 |
| 4078383 | Hydraulic hand jack with needle release valve A hydraulic vehicle jack including a novel release valve is disclosed. The jack is of the type having a high pressure cylinder, a ram partially extensible from and retractable into the cylinder, and a high pressure pump for forcing fluid from a reservoir ... | 03/14/1978 |
| 4054155 | Hydraulic actuated control valve This invention describes a valve in which the flow gate is operated by a piston in a hydraulic cylinder. The piston is forced axially, against the resistance of a coiled spring, by means of hydraulic fluid pressure provided by a motor driven pump. Electri... | 10/18/1977 |
| 4010609 | Jack-pump device The invention relates to improved jack-pump devices comprising a pump with a sliding piston forming first and second pump chambers, one on each side, a jack with a sliding piston forming first and second jack-chambers, one on each side, a first valve betw... | 03/08/1977 |
| 3986692 | Apparatus for supporting articles An apparatus for supporting articles comprises a deformable, rod-shaped support assembly including a plurality of links interconnected by articulated joints, a plurality of constrictor plates each disposed at the respective articulated joint of the links,... | 10/19/1976 |
| 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 |
