Abstract: The invention relates to a support for articles such as ceiling slabs, roof battens, machine parts or the like. The support comprises at least two telescopic tubes or one telescopic eod in at least one tube. A first tube or the rod can be displaced by a first distance in relation to the second tube, and devices are provided to convey the first tube or the rod a further distance in relation to the second tube. Stopping devices for the tube(s) and the rod are also provided in relation to each other and end stops are provided on the tubes, or the rod, the devices for further conveyance of the first tube or the rod comprising a ratchet, rack, clamping bracket or the like which are provided with manual advance devices.

Abstract: A jack includes a base member having a first chamber in which a piston is received, a main cylinder connected to base member and having a tube extending therein to which the lifting piston is movably mounted, a casing mounted to the main cylinder so as to define a second chamber between the casing and the main cylinder. A first path connects the second chamber and the first chamber and a second path connects the first chamber and the tube so that fluid enters into the tube to extend the lifting piston by operating the piston. A protection path extends between the outside of the base member and the second path with a first branch path and a second branch path respectively extending from the protection path and connecting the second chamber and the interior of the main cylinder. The pressure in the tube can be released by unscrewing the bolt threadedly engaged with the protection path so as to let the fluid enter into the second chamber and the interior of the main cylinder.

Abstract: This invention concerns an improved bottle jack. The invention comprises in combination, an improved bottle jack having a handle, fluid, and pump means and the improved bottle jack comprising the following. A base with the pump means being operatively connected to the base. An anchor rod having a lower anchor rod end and an upper anchor rod end being located opposite the lower anchor rod end, the anchor rod being located proximate the pump means and being pivotably connected to the base at the lower anchor rod end, the handle being pivotably connected to the anchor rod at the upper anchor rod end. A spring collar yoke being removably and pivotably connected to the handle and to the pump means, the spring collar yoke being located proximate the upper anchor rod end, the spring collar yoke being capable of concentrically enclosing the pump means.

Abstract: 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 circuit extends from an outer reservoir of a hydraulic cylinder via a check valve to connect to an oil chamber of a manual pump. The oil chamber of the pump is connected to an oil guide tube via another check valve, the oil guide tube is inserted into an inner oil chamber formed in a piston rod to form a closed circuit. The oil chamber of the pump is connected to an inner chamber of the hydraulic cylinder via a sequence valve and the inner chamber is connected to the outer reservoir via a check valve.

Abstract: A transportable lift includes a base and an elevator connected to the base which is arranged to support and vertically lift a load relative to the base. Transport wheels are connected to the base and are vertically moveable relative to the base. A control mechanism is connected to a frame for the transport wheels to selectively disable transport when a load is on the elevator. The control mechanism includes a drive connected to the frame for the transport wheels which, in use, exerts a first transport enabling force on the frame. A counter drive is connected to the base and the drive which, in use, exerts a second force to compensate the first force and a weight of exclusively the lift.

Abstract: A new hydraulic device for automobile accidents for quickly freeing individuals trapped in a vehicle as a result of an accident. The inventive device includes a hydraulic member comprised of a plurality of telescoping cylinders. The cylinders include a base cylinder, a top cylinder, and a pair of intermediate cylinders therebetween. The base cylinder has a pair of diametrically opposed handles secured thereto. The base cylinder has a hydraulic line connector extending outwardly thereof for coupling with a hydraulic line. The base cylinder has a level indicator disposed thereon corresponding with the hydraulic line connector for measuring input of hydraulic power therein. The base cylinder has an externally threaded extension extending downwardly form a lower end thereof. The top cylinder has an externally threaded extension extending upwardly from an upper end thereof. A foot is provided that is comprised of a generally rectangular plate.

Abstract: A mobile vehicle jack and support is disclosed that may be positioned below a vehicle, raise the vehicle to a selected height, and securely support the vehicle at the selected height. The mobile jack and support includes a frame, a lift arm rotatably coupled to the frame at one end and having a vehicle engagement at an opposite end, and an support member rotatably coupled to the frame.

Abstract: Portable, heavy duty jacks used in the railway, mining and construction industries are expensive units including a motor, a pump, a working fluid reservoir and a hydraulic cylinder, all mounted on a wheeled carriage. The jacks are moved to a use location and often left in one position for a lengthy period of time. Thus, it is often necessary to stock a large number of expensive units. A simple solution to the problem involves a single power module including a carriage, a motor, a pump and a fluid reservoir, and separate lift modules including a hydraulic cylinder. A lift module is releasably connected to the power module for moving the module to a use location, where the hydraulic cylinder is actuated to raise a load. The two modules are then disconnected, another lift module is attached to the power module, and the resulting unit is moved to another use location.

Abstract: The invention is an attachment for a hydraulic rescue tool and a method of using the attachment. The attachment comprises a front face; a rear face; two opposing outer side faces; an inner bottom face, having grooves therein and being angled upwardly from the front face to the rear face; two inner side faces, the inner side faces being inclined with respect to the inner bottom face and having longitudinal grooves therein; the faces forming a unitary body having a generally flat V-shaped cross section.

Abstract: An improved frame-type, manually-operated hydraulic car jack consists of a base, a pressure release valve, a socket, a lever, a hydraulic oil cylinder, a piston, a pair of pulling bars, a pair of links, a pair of pushing bars, a load-engaging head and a locking rod. A pair of horizontally aligned holes which have a diameter slightly larger than that of the locking rod are defined in the pushing bars. When the car jack is driven to lift a car supported by the car jack to a desired level, the locking rod is inserted into and extended through the holes on the pushing bars thereby to prevent an unintentional lowering of the car jack and the car.

Abstract: A hydraulic jack with a restorable lever and a retaining device includes a positioning blind hole provided on one side of a base. The blind hole holds a compression spring which acts between the base and a lever holder. A supporting post on one side of the base is provided with a pin hole for accepting a retaining pin to hold the lever holder in place. When the retaining pin is removed for operation, the stored energy of the compression spring is released so that the lever is lifted up automatically each time when it is pressed downwardly. A V-shaped spring clip connects the lever to the lever holder. A forward end of the lever is provided with a gripping hole and has two side notches, thus shaping the gripping hole to enable the lever to be used for opening and closing of a releasing valve. A foot pedal or a handle can be attached to an end of the lever for ease of operating the hydraulic jack.

Abstract: A hydraulic jack safety valve structure provided within the one-way valve body of the jack. The one-way valve has a cylindrical shape and is provided on the pump base of the jack. An annular slot is provided in the cylindrical body. The annular slot is provided with an oil inlet port and an L-shaped oil inlet passage which extends from the top surface of the one-way valve. An oil discharge port is provided so that the top of the one-way valve communicates with the bottom. The wall of the annular slot is provided with a safety oil discharge port which communicates with the oil discharge passage. Inside the safety oil discharge passage, a push pin and a safety spring are inserted in proper sequence. An adjustment screw is used to secure the pin and spring in place. The push pin, inside the safety oil discharge passage, provides flow guidance so that the flow of the hydraulic discharge fluid can be smooth.

Abstract: The invention provides a hydraulic toe jack including a base adapted to be supported by the ground, an elongated piston extending from the base and defining an axis, a generally cylindrical toe housing having a closed end and an open end, the toe housing defining an inner surface surrounding a portion of the piston, the toe housing being movable along the axis relative to the piston, interengaging components on the inner surface and the piston for preventing rotation of the toe housing relative to the piston about the axis, and a seal sealingly fixed to the toe housing adjacent the open end of the toe housing and slidably sealingly engaged with the piston.

Abstract: A dock leveler including a ramp is movable to a raised position by inflation of an inflatable member, such as an air bag assembly. One or more filler members are located within an internal cavity defined by the air bag assembly, to occupy void volume therein. The filler members expedite inflation of the bag assembly when an inflating device is operated to introduce air under pressure into the bag assembly. The filler members also function to maintain the bag assembly in an engaged condition with the underside of the ramp, and to prevent the air bag assembly from fully collapsing in order to prolong bag life.

Abstract: An automobile type hydraulic jack is converted from manual to powered actuation by removing the manual actuation handle socket and associated linkages and attaching a frame carrying an electric gear motor with an eccentric rotary output cam situated to reciprocate the original pump plunger to raise the jack. The frame is, preferably, attached to the pump plunger cylinder projection which extends from the jack base. Alternate frames provide for attachment to the pump fluid reservoir housing or to the jack base.

Abstract: A storage case includes a case body and a top cover hinged together for holding parts of a detachable jack. The top cover has a beveled front side, three recesses and holes in the beveled front side, three longitudinal steel column chambers of different respective lengths extended from the holes for holding the steel columns of the jack, and three stop strips extending upwardly from respective bottom sides of the recesses for stopping and retaining the steel columns in the longitudinal steel column chambers.

Abstract: An improved one-way valve structure for a hydraulic jack includes a stepped inlet end at a L-shaped intake passage for fixing of a filter. The diameter of the filter is slightly smaller than the inner diameter of the intake passage. The filter is designed so that it can be firmly positioned in the inlet end of the intake passage. Hydraulic fluid is filtered by the filter at the intake passage while it is passing through the one-way valve so that foreign particles in the hydraulic fluid from an oil reservoir are completely prevented from entering a pump seating and a pumping cylinder. Hence, the hydraulic fluid entering the pumping cylinder upon pushing of a handle on the pump seating does not contain impurities. In particular, as there are no foreign particles clogging the pressure release passage, normal pressure relief whenever the jack is overloaded can be assured to discharge the hydraulic fluid to the oil reservoir automatically. Consequently, damage to or explosion of the cylinder can be prevented.

Abstract: 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 to the solid first end to prevent insertion of the handle too deeply into the inner compartment of a jack when pumping it up, a hollowed out second end characterized by the presence of two notches located directly across from one another in the perimeter of the hollowed out second end for receipt of ear screws on or within jacks and a second shoulder in close proximity to the hollowed out second end to prevent inadvertent insertion of this end into the well of a jack when pumping it up.

Abstract: A jack includes two cylinder disposed on a base and actuated respectively for elevating vehicles having either lower or nigher base. A slide is slidably engaged on a larger cylinder and secured to a smaller cylinder so as to be moved upward by the smaller cylinder. Two pairs of levers are pivotally coupled between a support and the slide and a pair of links pivotally couple the levers to the larger cylinder. The support is elevated when the slide is moved upward by the smaller cylinder, and the support is further elevated when the larger cylinder is actuated.

Abstract: A lifting device for lifting heavier loads is disclosed including a square base plate having a plurality of wheels attached in triangular arrangement which provide a low center of gravity for the lifting device. Mounted in the center of the square base plate is a cylindrical housing having a sealed tube within an unsealed tube, a space between the tubes, a fluid holding chamber, a fluid filed chamber, a fluid filled space, a plurality of hydraulic seals, an orifice between the fluid filled space and the fluid holding chamber, a plurality of orifices in the bottom aspect of the fluid holding chamber and a plurality of external connections, an orifice in the top aspect of the fluid holding chamber between the fluid holding chamber and the operating chamber, a tube in the fluid holding chamber for transferring pressurized hydraulic fluid to the operating chamber, and a piston assembly having an operating chamber which is slidable longitudinally in the cylindrical housing.

Abstract: A scissor jack includes a base, an oil reservoir, a pumping unit, an oil pressure cylinder, two lift arm units, a connecting rod provided between a lower arm of each lift arm unit and the top of a piston rod of the oil pressure cylinder, a handle provided to operate the pumping unit to send the oil in the reservoir to the oil pressure cylinder to move the two lift arm units up for lifting an object on the jack, two rollers fixed at both ends of a shaft sustained at an intermediate portion of each lower arm to sit on the ground when the lift arm units are lowered down to the lowest position to roll on the ground, and a spring being provided between an upper arm and each lower arm for stabilizing going-down movement of the lift arm units.

Abstract: A camper jack for mounting on a camper body, the jack having an extensible leg projectable from a hollow jack housing and attached to the camper body along the length of the housing. A piston cooperating in a cylinder in the extensible leg extends the leg from the housing. A hydraulic fluid reservoir is formed in the extensible leg in an annular space surrounding the cylinder. A valve block is coextensive with the extensible leg at the foot of the leg and contains the valves and pumping piston for the jack. Valving in the valve block permits manual extension and retraction of the extensible leg. Grooves are provided in a novel needle valve allowing control of the rate of flow of the hydraulic fluid. Pumping motion is controlled by a pump handle receiver.

Abstract: 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 fluid. A single foot pedal is pivotally supported on the jack, and is movable between first and second positions through a center position. A hydraulic valve arrangement is responsive to movement of the actuating member toward its first position for permitting fluid flow from the reservoir to the hydraulic cylinder and is responsive to movement of the actuating member toward its second position for permitting fluid flow from the hydraulic cylinder to the reservoir. A kicker lever supported for pivotal movement about the same axis as the actuating member is operatively coupled to the actuating member for movement therewith by two springs, and can actuate an air valve.

Abstract: A lifting and lowering system for a trailer includes one or more extendible and retractable legs, with the legs being provided with springs or the like urging the legs toward their retracted position. The system is a pressurized air/hydraulic system, and includes an air-operated booster valve for extending the legs when loaded. A master valve assembly is provided for controlling supply of air to the system and for allowing retraction of the legs. The master valve and air valve include a common actuator shaft so that the system is selectively connected to pressurized air or vented, as appropriate, when leg extension or retraction occurs. The master valve includes a cam actuator/cam follower piston operated system for selectively providing fluid pressure to a lock valve associated with each leg. The lock valve is biased toward a normally closed position, and is selectively movable to an open position for allowing extension or retraction of the legs.

Abstract: A hydraulic jack useful in both a horizontal position and a vertical position is disclosed. The jack has a fixed support shoe and a moveable lifting lug which are perpendicularly connected to a column which houses a hydraulically moveable sliding shaft. Hydraulic fluid is stored in a flexible bottle and is fed to a hydraulic pump housed inside a rigid tank, the interior of which constantly communicates with the surrounding atmosphere. The positioning of the flexible bottle with respect to the pump and the communication with the surrounding atmosphere enables the pump to be permanently primed regardless of its orientation.

Abstract: A vehicle jack comprises a base with means for moving the jack smoothly on a ground, an upright shell located on the base, an upright hydraulic ram located inside the shell and including a cylinder construction and a hollow rod, a vehicle support for directly supporting the bottom of a vehicle to be jacked up, a hydraulic source for raising the cylinder construction, and a locking means for mechanically preventing the cylinder construction from lowering from a raised position. The cylinder construction may include an outer cylindrical wall, an intermediate, slidable cylindrical wall capable of being extended upwardly from the rest of the cylinder construction and having openings through any one of which a pin may be inserted to fix the intermediate cylindrical wall at a required height, and an inner cylindrical wall defining an inner cylinder chamber.

Abstract: A jack is adapted for both lifting and pumping functions driven by a common drive motor. This jack has a detachable motor/air pump unit for use apart from the remainder of the jack. The motor/air pump unit is formed as a single unit which, if desired, is independently supported by a stand which is integral therewith. The unit is operatively, removably received in a saddle of the jack, where it is secured in place by a pivoted strap and buckle arrangement.

Abstract: A portable automotive jack is provided having a generally triangular configuration defined by first and second pairs of pneumatic cylinders. Specifically, the cylinders of one of the pairs of are spaced apart from one another and straddle the cylinders of the other pair so that the pairs of cylinders define the legs of a triangle. A lift plate is mounted to the upper ends of the hydraulic cylinders at the apex of the triangle whereby actuation of the cylinders moves the lift plate relative to the base member to permit jacking of a vehicle therewith. The jacking assembly, by virtue of a common source of air pressure and flexible mounts, adjusts in angle and position to accommodate changes in angle of the vehicle as it is bieng jacked thus providing a device which has an inherent stability and relative insensitivity to the hardness and flatness of the jacking surface and the construction of modern cars.

Abstract: A lifting unit with an incorporated piezoelectric transducer comprises an extendable trolley (1-4) with a frontwardly tapered plan profile and is upperly provided with a flat vertical compass structure (5) which is symmetrically disposed about the main axes of the underlying trolley (1-4) and has its arms converging towards a horizontal box member (6) containing a piezoelectric transducer (15), at which the arms are linked together and at which there is provided, above the box member (6) a positionable lifting and support saddle (21) which is disposed transversely to the flat vertical compass structure (5).

Abstract: A hydraulic jack including a bleed port for permitting the flow of fluid from the ram cylinder when the head portion of the ram moves to a position adjacent one end of the cylinder so as to prevent the ram head portion from being forced and the sealing means against the end of the cylinder. The bleed port means comprises a bore formed by a laser beam and extending through the cylinder wall, the bore having a diameter of less than approximately 0.015 inches along substantially its entire length.

Abstract: A jack is adapted for both lifting and pumping functions driven by a common drive motor. This jack has a detachable motor/air pump unit for use apart from the remainder of the jack. The motor/air pump unit is formed as a single unit which, if desired, is independently supported by a stand which is integral therewith. The unit is operatively, removably received in a saddle of the jack, where it is secured in place by a pivoted strap and buckle arrangement.

Abstract: An overload protected motor which drives a motor assembly to urge a connector rod up and down. The connector rod has two piston heads connected in line with each other, a large pneumatic piston head to pump air and a smaller hydraulic piston head to pump hydraulic fluid. The pneumatic head reciprocates in an air cylinder which has an air inlet and an air outlet. Both the inlet and the outlet have spring-loaded air stops which allow for one-way passage of air into and out of the air cylinder, respectively.

Abstract: A hydraulic jack adapted to provide an auxiliary air pumping function is disclosed. The jack has a hydraulically-actuated lifting mechanism, an air pump and a reversible electric motor having a drive shaft. A first clutch means operatively couples the drive shaft to the lifting mechanism. A second clutch means operatively couples the drive shaft to the air pump. Each of said clutch means are independently operable and are oppositely configured to one another, such that at any given time the drive shaft drives only one of either the lifting mechanism or the air pump respectively. Means are also provided for supplying power to the motor and for reversing operational driving direction of the motor. In a preferred embodiment, the clutch means are one-way clutch means.

Abstract: A method and apparatus for use in repairing or replacing parts of the suspension system, such as a MacPherson strut of an automobile which suspends a frame or passenger compartment from a lower portion which includes the wheels and the axle. The apparatus includes an elongated upright apparatus which has a piston rod extending out the top. A special mounted assembly is mounted on top of the piston rod with outwardly extending arms which exerts an upward force on the spring of the MacPherson strut. At the same time a chain is attached between the housing of the elongated tool and the frame or body to prevent upper movement of the frame. When the spring is compressed the shock absorber portion of the MacPherson strut can be removed and replaced.

Abstract: The object of the invention is to provide a mechanical force actuator which is light weight and manipulatable and utilizes linear motion for push or pull forces while maintaining a constant overall length.The mechanical force producing mechanism comprises a linear actuator mechanism (22,23) and a linear motion shaft (11) mounted parallel to one another. The linear motion shaft (11) is connected to a stationary or fixed housing (12) and to a movable housing (26) where the movable housing (26) is mechanically actuated through actuator mechanism (22,26) by either manual means (21) or motor means (20). The housings (12,26) are adapted to releasably receive a variety of jaw or pulling elements (28) adapted for clamping or prying action. The stationary housing (12) is adapted to be pivotally mounted to permit an angular position of the housing to allow the tool to adapt to skewed interfaces. The actuator mechanisms (22,23) is operated by through a gear train (19) to obtain linear motion of the actuator mechanism.

Abstract: This invention relates to a portable motorcycle stand and lift which permits a single operator to lift a motorcycle unassisted. After actuating a hoisting means to lift the motorcycle to its desired height, pins are used as locking means to immobilize the relatively movable frame members.

Abstract: A pneumatic hoist is provided for lifting cabinets, ceiling frames, and the like. The hoist includes a tripod base and manual structure for an initial height adjustment.

Abstract: An hydraulic load binder is disclosed for universal application, the piston rod assembly, the reservoir assembly and the pump assembly all being commonly housed. The channels to and from the pump and the piston rod chamber and the reservoir chamber are controlled by simple check valves. Two additional channels are provided for communicating the top of the piston rod chamber with the reservoir chamber. One of these additional channels includes a check valve which opens when the pressure in the piston rod chamber reaches a predetermined limit. The other additional channel is controlled by a needle valve, which is opened once a rotatable mechanical locking means is placed in locking position against the extended piston rod. Opening the needle valve depressurizes the piston rod chamber. The piston rod chamber is again pressurized to permit the mechanical lock to be released.

Abstract: An automatic compressor-jack device which comprises an air compressor, a hydraulic jack and a transmission mechanism. The transmission mechanism, which is driven by a motor through a reduction gear, comprises an eccentrically disposed pin to connect to the piston rods of the cylinders of the compressor and the jack. Therefore, when the motor rotates, the transmission mechanism drives the air compressor and jack at the same time. That is, this one device allows the user two tire repair functions.

Abstract: Hydraulic jack with one-way Hydraulic Path in Association with safety pressure relief network, including a one-way valve in the hydraulic path, a plurality of steel balls, steel ball bumpers, compression springs, O rings and safety screws, to facilitate local control of the pressure in the hydraulic path. Correct current flow direction, and the realization of safely established pressure, is assumed by a more simple assembling procedure, at reduced costs and manhours.

Abstract: A hydraulic jack having an air pumping feature is disclosed. This jack is provided with a common drive motor including an elongated double-ended shaft having respective portions projecting from the motor. The one end of the shaft is connected to first reduction gearing which, in turn, drives a piston of an air pump. The other end of the shaft is connected to a second reduction gearing which, in turn, drives an oil pump of the lifting mechanism of the jack.

Abstract: A hydraulic floor jack is disclosed which is adapted for the tasks of lifting a vehicle and pumping up a tire. The jack is provided with a common drive motor including an elongated double-ended shaft having respective end portions projecting from the motor. The one end of the shaft is connected to and drives a piston of an air pump. The other end of the shaft is connected to a second reduction gearing which, in turn, drives an oil pump including a drive rod and a lifting mechanism including a pivoted arm set driven by the drive rod.

Abstract: A pump lever for a jack includes a handle sleeve adapted to receive a handle and be connected to a piston of a fluid pump for the jack and a limiting piece secured to a base on the jack and for guiding the handle sleeve to be raised and lowered and confining a safe range within which the handle sleeve can be raised and lowered without damaging the piston.

Abstract: A hydraulic jack includes a pump, a high pressure chamber, a low pressure chamber and a passage with a one-way valve communicating the high pressure chamber and the low pressure chamber. When a load is encountered, the high pressure chamber and the low pressure chamber are connected immediately through the passage through which the pump feeds the low pressure chamber to lift the load.

Abstract: A variable and high lift jack powered by a hydraulic cylinder for lifting heavy work objects from close to the ground to high levels away from the ground, initial engagement being optionally low, intermediate and high; an adjustable, variable, low and high lift jack involving three basic adjustments, specifically: (1) a collar/platform on a vertical post, the latter carrying a hydraulic cylinder, (2) a slideable vertical sleeve on the same post vertically adjustable with respect to the top of the piston rod of the hydraulic cylinder by a chain carried between supports of the sleeve over the rod and (3) the variable vertical extendability and retractability of the piston rod of the hydraulic cylinder, the combination of these adjustments giving extraordinary versatility with respect to low to high adjustment of the work engaging beam of the lift device; a lift device of great power and versatility with a range, for example, from 6 to 44 inches in lift while maintaining the greatest safety of operation over the

Abstract: A jack base is a plastic base by directly molding on the lower portion of a hydraulic pump, a hydraulic cylinder and a hydraulic oil conduit connected between the pump and the cylinder so as to form an integrated jack.

Abstract: A pneumatic jack including a jack head adapted to be elevated by an expansible flexible bag member inflated with compressed air. A locking mechanism for holding the jack head in its elevated position, including a hydraulically controlled expansible plunger member connected to the jack head. The hydraulic fluid is introduced into the expansible plunger member through a check valve by the motive force of the compressed air. The jack head is lowered by relieving the compressed air within the bag member and by overriding the check valve to permit reverse flow of the hydraulic fluid from the extensible plunger member into a reservoir.

Abstract: An improved electrical hydraulic jack of the type having of a jack body with a lift structure and a manually adjustable crown rod telescopically disposed therein, a base plate integrally formed to the jack body, a motor assembly matched with a housing body fixed on the base plate in upright position, wherein the improvement comprises a transmission device installed in the upper portion of the housing body in connection with the motor assembly, and a driving device mechanically coupled between the transmission device and the jack body, thereby, the high revolution of the motor assembly will be reduced, and the revolving motion will be converted into straight line movement for effecting hydraulic lift operation therewith.

Abstract: An automatic pneumatic-hydraulic jack comprises a mini air compressor and automatic hydraulic jack to serve as an on-vehicle tool wherein the power of the battery on the vehicle is used to drive the mini air compressor which compresses air to serve as its primary force. The air enters an entry channel from an air inlet nozzle and passes to an air chamber via a changeover valve to push a small air-oil piston, thus converting air pressure into hydraulic pressure on the other side of the piston which enters into a large hydraulic cylinder via a check valve and pushes a large piston.

Abstract: 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 for receiving the lever for activating the plunger is divided into two parts so that the distance between the fulcrum belonging to one of the two parts of the socket and the working end belonging to the other part may be varied according to the need.