Abstract: A system for lifting a vehicle for repair thereof includes at least a pair of opposed posts each having a carriage connected thereto and having an inner space wherein a vertical cylinder with a piston rod is disposed. A deflecting member is connected to the top of the piston rod. The carriage is interconnected to the piston rod by device of a connecting means which has one end fixed to the carriage and another end fixed to the inner surface of the post and also has a portion fitted on the deflecting member. In the inner space of the post, a rack is connected to the piston rod in parallel therewith. A locking member is connected to a horizontal shaft extending through and rotatably supported by a bracket which is fixed to the outside of the post. The locking member projects into the post through an opening which is made through the wall of the post, and engages the rack. A lever is interconnected to the locking member for disengaging the locking member from the rack.

Abstract: A system for lifting a vehicle for repair thereof has a pair of parallel pits which are made in a floor and connected to each other by a passage. A rotatable support rod extends through the entire length of said passage and projects into both of the pits. A pair of scissors jacks are supported in the respective pits. Each scissors jack includes a pair of parallel vertically-extensible double-scissors constructions. The double-scissors constructions can be retracted or folded into the associated pit. Each double-scissors construction comprises a pair of upper and lower vertically-extensible X-shaped elements pivotally connected to each other. Each X-shaped element includes a pair of links pivotally connected to each other in the alphabetical letter "X". One of the links of the lower X-shaped element has a lower end fixed to the support rod, so that all the four double-scissors constructions of the two scissors jacks are connected to the common support rod.

Abstract: Device for transporting load units consisting of a drive system carrier to which two track-laying drive systems are linked. A lifting platform is supported opposite the drive system carrier over several longitudinally adjustable lifting elements, so that said elements are at least partially provided with articulations movable in all directions, both in the region of the lifting platform and also in the region of the drive system carrier, so as to ensure the displacement in all directions of the lifting platform.

Abstract: A pantograph lifting ramp for motor vehicles includes a pair of wheel guides supported by at least two pairs of columns, which are pivoted at their lower ends to two base frames. The columns of at least one pair have their lower ends connected through a torsion bar consisting of connectable sections. The lifting ramp includes a safety valve to prevent uncontrolled descent in case of failure of the hydraulic fluid system, and another safety device to arrest lowering of the lifting ramp if a worker's foot is accidentally placed between the base frame and a column or wheel guide during lowering of the ramp.

Abstract: An hydraulic elevator (10) is powered by a pair of jacks (45) disposed adjacent to opposite sides of the platform (40) of the elevator car at medial locations thereon for enhanced compactness of the elevator and generally symmetric, nonbending support of the car.

Abstract: A construction system incorporating the formation of a plurality of building components, such as but not limited to concrete slabs used for floors, wherein the slabs are formed about a plurality of supporting columns of a predetermined height depending upon the intended height of the building under construction. The subject system includes a plurality of lifting assemblies secured to the slabs, and structured to travel along the length of the columns carrying the slabs as they travel. A control assembly is provided to insure a level orientation of the slabs and a consistent rate of travel and lifting force being exerted on the slabs uniformly so as to maintain such slabs, during lifting, in a level orientation to prevent damage thereto.

Abstract: A safety device which prevents any one-sided lowering motion of a jacking system including a plurality of jacks which are designed for simultaneous operation, and a mechanism connecting the jacks for their simultaneous operation. Each jack includes a first hydraulic or pneumatic cylinder for raising and lowering a table, a substantially vertically disposed rack mechanism, a pawl mechanism which is normally engaged with the rack mechanism to hold the table in a raised position, and a second pneumatic or hydraulic cylinder for disengaging the pawl mechanism from the rack mechanism. The safety device includes a plurality of valves each provided in one of the jacks and operable by a pushbutton to produce a fluid presure signal when the pushbutton has been depressed. A mechanical actuator is provided in each jack for depressing the pushbutton when the pawl mechanism has been disengaged from the rack mechanism.

Abstract: A process for lifting tanks where several hydraulic jack assemblies are positioned adjacent to the external peripheral wall of the tank and, if the tank has large dimensions, additional hydraulic jack assemblies are positioned inside the tank. After the jack assemblies are secured to the tank structure, the lifting operation is begun. The jack assemblies provide the necessary lifting force from a substantial hydraulic pressure and relatively small displacement. The jack assemblies are inverted so that the housing is lifted while the rod stays stationary. After complete distension, log members are inserted below the lowermost end of the jack housing and the rod retracted. Then, an additional log member is inserted below the retracted rod and the lifting operation renewed.

Abstract: A hydraulic hoist platform for passenger vehicles has floor group halves spaced from one another and a parallelogram device for each floor group half, movable up and down parallel to one another in a vertical plane and each comprising a carrier arm and a guide rod having a first end region articulated to its respective floor group half with bearing bodies highly loadable at least by torsion. The parallelogram devices have a second end region having a support device for the passenger vehicle. A lever device is secured rigidly to the outer region of each of the bearing bodies, and is angularly offset from the carrier arm in the direction of lifting. A hydraulic unit is arranged substantially horizontally in each of the floor groups, and is connected between the lever device and the floor groups.

Abstract: A load lifting device for temporarily lifting and supporting roof mounted equipment such as air conditioning units so that roof repairs may be made includes spaced beam sections insertable under the roof mounted equipment and jacks for raising such equipment off the roof. Each beam section includes an outer end which is raised relative to the portion inserted under the equipment, the jacks being received under the raised ends. The beam sections include stops which are positioned adjacent the equipment to keep the jacks spaced laterally of the equipment. After the repairs, the roof mounted equipment is lowered into place.

Abstract: A low profile vehicle parking apparatus is provided. The apparatus comprises a base and a pair of upstanding stanchions. A vehicle parking platform is disposed between and movable along the stanchions. An articulated stabilizer bar assembly comprising a rocker arm and a control arm are pivotally connected to one another and to the parking platform and base respectively. A piston and cylinder assembly extends pivotally from a fixed location to a pivotal location on the articulated stabilizer bar assembly. Thus, the piston and cylinder assemblies do not add to the height of the apparatus and contribute to the stabilization during the lifting of a vehicle on the parking platform.

Abstract: The apparatus positively induces synchronism in at least two lifting jacks. It has an upwardly and downwardly movable carriage, on the lifting jack, a column, a lifting device extending along the column, a first control device to control the lifting device in the "lift" direction, a second control device to control the lifting device in the "lower" direction, a "lift" switch on the main lifting jack, a "lower" switch on the main lifting jack. For each lifting jack, a motor device acts on the lifting device. Along each column there is an equally spaced marking unit, the spacing corresponding to the maximum admissible lift difference between the lifting jacks. Each marking unit has an `ON` zone and an `OFF` zone. Rigidly fixed to each carriage is a tracer for scanning the marker units. Each tracer, is in an electrical switching device, and inhibits the motor device when the tracer is in the `OFF` zone, until such time as the tracer of the carriage which is lagging most behind is also in the `OFF` zone.

Abstract: A lifting device, for vehicles, has two support platforms. Scissor mechanisms connect these platforms, to bases, and are actuated by hydraulic piston and cylinder assemblies. A combiner and divider valve supplies fluid to the two hydraulic cylinders. A single cross brace can be provided between the two support platforms. This ensures the two platforms operate uniformly, even for an uneven load distribution, while giving a clear working space.

Abstract: A frame supported by a base has at least an upper platform and a lower platform adapted to be nested together and supported at lower positions by the base. The upper and lower platforms are adapted to be moved upward for supporting vehicles above the ground. Lifting mechanism is provided for lifting the upper platform with a vehicle thereon to a first upper level sufficient to allow a vehicle to be located on the lower platform. Connecting straps extend between the two platforms such that when the upper platform is moved upward beyond the first upper level, the lower platform is pulled upward by the connecting straps. The lifting mechanism is adapted to move the upper platform with a vehicle thereon upward to a second upper level sufficient to pull the lower platform with a vehicle thereon to a level sufficient to allow a vehicle to be driven thereunder.

Abstract: The apparatus positively induces synchronism in at least two lifting jacks. It has an upwardly and downwardly movable carriage on the lifting jack, a column, a lifting device extending along the column, a first control device to control the lifting device in the "lift" direction, a second control device to control the lifting device in the "lower" direction, a "lift" switch on the main lifting jack, a "lower" switch on the main lifting jack. For each lifting jack, a motor device acts on the lifting device. Along each column there is an equally spaced marking unit, the spacing corresponding to the maximum admissible lift difference between the lifting jacks. Each marking unit has an `ON` zone and an `OFF` zone. Rigidly fixed to each carriage is a tracer for scanning the marker units. Each tracer, is in an electrical switching device, and inhibits the motor device when the tracer is in the `OFF` zone, until such time as the tracer of the carriage which is lagging most behind is also in the `OFF` zone.

Abstract: The invention provides a retractile polyarticulated mechanism comprising at least one elementary mechanism (4) formed of two endmost pieces (5, 6) one of which is a reference and, for connecting these endmost pieces (5, 6) together at least three legs (7,8,9) situated in separate planes and formed of two parts (10 and 11, or 12 and 13, or 14 and 15) each associated, on the one hand, with the other part forming the same leg by a spherical connection (16, 17 and 18) and, on the other hand, with an endmost piece (5, 6) different from the one with which this other part is associated by a rotoid connection (either 19 or 20, either 21 or 22, or finally 23 or 24).

Abstract: An apparatus for disabling an obstructed lift mechanism having at least two hydraulic cylinders for controllably lifting and lowering a load includes a pair of valves, each arranged for sensing the differential pressure between a first sensing line and a second sensing line. The first valve is movable to a position for preventing the flow of hydraulic fluid from a first cylinder when the pressure in the second sensing line exceeds that in the first sensing line by a first predetermined value. The second value is movable to a position for preventing the flow of hydraulic fluid from the first cylinder when the pressure in the first sensing line exceeds that in the second sensing line by a second predetermined value. If the flow of hydraulic fluid from the first cylinder is prevented by the movement of either the first valve or the second valve, the operator is required to lift the load slightly to remove the obstruction.

Abstract: An apparatus for expanding a building structure in which the roof structure of an existing building is raised by a plurality of column assemblies, each including an outer section and at least one inner section. A jack assembly is provided which raises each inner section into an extended position relative to its corresponding outer section. A clamping device is mounted on each jack assembly for gripping the inner section and when the extended position is reached the corresponding sections are secured with the clamping device automatically releasing upon downward movement of the jack assembly.

Abstract: A gantry has four separate base members adapted to move along spaced parallel tracks. In most configurations, adjustable tie rods connect the four base members into two associated pairs, each of the associated pairs being positioned to follow along one of the rails. A hydraulic ram or rams extends upward from each of the base members. A superstructure, usually in the form of four I- or H-beams in a somewhat rectangular frame configuration, is attached at the corners to the tops of the hydraulic rams for lifting a load within the space which is straddled by the gantry. Between the top of each of the rams and the beams forming the frame is a coupling which provides flexibility in a plane above the tracks. Part of the coupling is an arcuate section of a cylinder which enables the superstructure to rock by about 10.degree.. The gantry may be reconfigured in many optional ways to enable it to change the attitude of the load.

Abstract: In a scissor-type lifting platform with two pairs of scissors disposed independently of one another, with hydraulic operation, a control cylinder is provided at one pair of scissors which is designed such that it produces the power required for the lifting of both pairs of scissors. A slave cylinder is series connected to said control cylinder at the second pair of scissors, which in the case of the lifting movement of the control cylinder is supplied with pressure medium. In this manner, a synchronization of the two pairs of scissors is achieved perforce and a mechanical connecting arrangement between the two pairs of scissors for the monitoring of synchronization may be eliminated.

Abstract: A vehicle rerailing device for use in difficult climates and the full range of temperature conditions present in such climates comprising rerailing elements connectable to and acting on a derailed and possibly overturned vehicle and hydraulic means which can be operated over said full range of temperature conditions to operate the rerailing elements. Said hydraulic means comprises a hydraulic lift device which includes a plurality of pressure displacement cylinders, each with a displaceable piston in it, a pressure chamber at one side of the piston and a second chamber at the other side of the piston. A high pressure generating unit is connected with the pressure chamber. A vacuum generator is connected with the pressure chamber. A control valve determines whether the pressure chamber is pressurized or is at reduced pressure to shift the piston, respectively, to lift the load or to return unloaded.

Abstract: A cargo container lift device comprised of a plurality of upright posts which define a bay into and out of which a transportation vehicle is driven. Vertical plates are slidably mounted on each of the posts and engage laterally extending supports which are movably connected to the cargo container. Hydraulic rams connecting the posts and plates permit the reciprocative movement of plates. Wheels mounted on the plates for common movement therewith counteracts the torque on the plates from the cargo container.

Abstract: A hydraulic vehicle lift comprising a pair of hydraulic cylinders with outwardly projecting lifting arms for engaging a vehicle to be lifted. The lifting arms are secured to a housing which includes wheels in rolling contact with the outer surface of the hydraulic cylinders. A cable system extending between the hydraulic cylinders and lifting arms is provided to balance the ascent and descent of the lifting arms on the two cylinders.

Abstract: A conveyor belt tensioning system having two fluid piston and cylinders units on each lateral side of the belt. The units are parallel to each other and are attached to a tensioning roll. A pair of cables are attached to both of the pistons and pass around pulleys in a manner as to compensate for any differences in force between the pistons such that the pistons move in the same direction the same amount.

Abstract: A safety locking mechanism for locking a hoist, such as a power operated tailgate, with repect to its supporting structure comprises: a pair of latch arms which are connected to one another by a flexible cable. A pair of power transmission chains connect the hoist to a power source. A pair of tension sensing lever arms are pivotally mounted and arranged to detect the presence or absence of a normal loading tension in the power transmission chains. The flexible cable also engages each of the tension sensing levers and is held by them in a position in which it retains the latch arms in a released position when a normal loading tension is detected in the power transmission chains. The latch arms will both move to a latching position locking the hoist when the absence of a normal loading tension is detected in the power transmission chains.

Abstract: A portable hydraulic service lift for elevating equipment such as industrial vehicles. The lift includes a base assembly including a platform which supports the elevated lift and allows the lift to be readily moved to a different location. A pair of rigid support legs extend upwardly from one end of the base platform and are spaced transversely to receive a portion of the equipment to be elevated therebetween. A pair of elongate lifting arms are joined in a cantilevered fashion to the support legs along the sides of the base platform. Rollers join the lifting arms to the adjacent support leg so that the arms can be raised and lowered in a cantilevered fashion while rolling along the support legs. Lifting bars extending transversely across the lifting arms are adapted to engage with the underside of the vehicle to be lifted. Power lifting mechanism are provided to raise and lower the arms and the vehicle supported on the lifting bars.

Abstract: A double post lift assembly is disclosed wherein each post contains a stationary hollow tube disposed around a hydraulic cylinder and a movable hollow tube disposed around and laterally spaced from the stationary tube. A hollow sleeve is disposed in the space between the stationary and movable tubes of each post and is attached to a lower end portion of the movable tube for movement therewith. A series of spacer blocks constructed of non-abrasive material is disposed in slots arranged in two rows around each sleeve, which blocks project inwardly of the sleeves into sliding engagement with a corresponding stationary tube. A carriage arm containing an adjustable article supporting pad is attached to the lower end of each of the movable tubes. The pads are pivotally attached to the arms so that they may rock through a vertical arc and the arms are adapted to swing through a horizontal arc as the arms lift a rear end portion of a vehicle partially supported thereon.

Abstract: A transportable heavy-lift apparatus for moving heavy objects comprising a base housing having a plurality of cylinder members vertically supported therein, the cylinder members having a load platform attached to their top ends, and a fluid actuating system disposed in the base housing for vertically moving the cylinder members and load platform. The cylinder members are so arranged such that their common lift vector is substantially aligned with the center of the base housing, and the base housing is constructed such that load forces experienced when moving heavy objects is equally distributed throughout the base housing to its floor plate. Swivel lugs disposed in the top end portions of the cylinder members connect the load platform thereto. The fluid actuating system permits the cylinder members to be independently rapidly elevated to a lift position for an object.

Abstract: A grand piano lift comprising a dolly on which the piano is placed and having a hydraulic cylinder fixed in vertical disposition to the dolly in the vicinity of each of the three legs of the piano. A piston is slidably disposed in each of the cylinders and has a piston rod extending from the piston fixed to a pedestal that contacts the floor or platform from which the piano is to be supported. An operator operated UP switch is electrically connected with a source of hydraulic fluid under pressure so that the operator can cause fluid to be applied to the cylinders from the source and so that the cylinders are effective to raise the dolly and piano. A similar DOWN switch causes this fluid to be drained from the cylinders to cause the piano to be lowered.

Abstract: The invention is a lifting or elevator device to lift one end of a package or load for insertion of a pull-tab slipsheet thereunder. It comprises a tiltable elevator having a load supporting cross bar raised and lowered by jacks located at each end. The jacks are rigidly mounted to each other. Both are mounted to a base member so that they can be tilted forward to move the cross bar beneath the pull tab and out of interfering position with a load handling push/pull lift truck.

Abstract: A lifting and positioning apparatus particularly suited for use in the installation of wing-mounted airplane engines includes superposed upper and lower load-bearing support platforms that are connected to one another by means of a jack mechanism operable to raise and lower the upper platform while supported by the lower platform. The lower platform includes and is movably supportable on fluid cushion bearings. The upper platform supports a plurality of resilient elastomeric elevator bellows that are positioned and adapted to receive and support a heavy object, such as an aircraft engine, while cushioned against application of excessive lifting force. The bellows are independently inflatable and deflatable to effect raising and lowering of selected portions of the aircraft engine and thereby rotate the engine to desired angular orientations. Alternatively, the bellows may be actuated conjointly to effect uniform vertical raising or lowering of the aircraft engine.

Abstract: A heavy and elongate recumbent load, such as a missile, is floatingly supported by two pairs of hydraulic pistons engaging it forwardly and rearwardly of its center of gravity, the pistons of each pair being oppositely inclined at 45.degree. to the horizontal. Each piston is part of a single-acting jack whose cylinder has its bottom end connected via a pair of antiparallel check valves to a source of hydraulic fluid, such as a pump in parallel with an accumulator, whose pressure substantially balances the component of the load bearing upon the respective piston. Each check valve has a bising spring so adjusted that it allows the valve to open in response to a manual force applied to the load near the point of attack of the associated piston whereby the load can be reoriented by hand, e.g. for alignment with a launching tube into which a missile is to be inserted with the aid of a carriage equipped with the four hydraulic jacks.

Abstract: For use with an offshore drilling barge, a jacking apparatus is disclosed which utilizes racks mounted on the leg to be elevated, there being two or more racks on each leg, and the racks are equipped with teeth and spaces where teeth are omitted. There is attached to the barge a cooperative, fixed rack and a pinion carried on the end of a piston rod connected with a hydraulic piston. The pinion is located and has teeth appropriate to fit between the rack on the leg and the fixed rack on the barge. By aptly spacing the gaps in the several racks on the leg, racks can be omitted for significant lengths, and, additionally, the pinion can be periodically disengaged to enable rapid extension or retrieval of the pinion.

Abstract: An apparatus for lifting and shifting the upper sweep (6) in relation to the lower sweep (2) in the construction of a large cylindrical cistern, comprising a support member (1) hung on the upper edge (3) of the lower sweep (2) and provided with an upstanding carrier body (16). The upper edge of the latter extends parallel to the upper edge (3) of the lower sweep (2) to form a track (19). The carrier body (16) carries a lift member (32) which in turn carries the upper sweep (6). The lift member (32) is formed as a yoke, the cross portion of which rests on a wedge-shaped shifting member (24) in turn resting on the carrier body (16). The wedge (24) is reciprocably displaceable parallel to the lower sweep edge (2) with the aid of a hydraulic cylinder (22). During a first phase of the forward travel, the lift member (32) and the upper sweep (6) are solely given a lifting movement, and during a subsequent forward movement the lift member and the upper sweep are also given a shifting movement.

Abstract: A lifting jack has its upward and downward traveling distance controlled by means of a limit switch. The lifting jack has a base, an upright outer member rigidly connected to the base and an upright inner member movable coaxially within the outer member. An up stop and an adjustable down stop are rigidly attached to and move with the inner member. An adjustable mount is mounted in a fixed position on the outer member, and the limit switch is mounted in fixed position on the mount. A guide shoe assembly is pivotally connected to the mount and is oriented generally perpendicular to the direction of travel of the inner member. A stop engaging member at one end of the guide is positioned to engage the up stop and the down stop, and an arm guiding portion at the opposite end engages and guides an actuating arm of the limit switch.

Abstract: A hydraulic lifting jack including a ratchet and pawl stop mechanism which is blocked by an actuating lever pivotally mounted with a generally vertically extending rail adapted to be moved transversely to its longitudinal extension to pivot the actuating lever into and out of locking engagement with the pawl. A hydraulic device may be utilized to actuate the vertical rail.

Abstract: A service jack to be mounted on a vehicle lift rack for movement into desired places along the runways of the lift rack. The service jack includes a carriage suspended between the runways, an elongated vehicle lifting jack assembly operably supported by the carriage for vertical movement toward and away from the frame members of a vehicle supported on the runways, a fluid pressure lifting member between the carriage and the vehicle lifting jack assembly, releasible safety device responsive to raising of the vehicle lifting jack assembly for preventing accidental reverse movement thereof, and devices for guiding and maintaining the vehicle lifting jack assembly in a substantially level attitude in all positions.

Abstract: Pre-formed concrete floor slabs stacked one on top of the other, at or near ground level, are raised vertically into desired elevations for permanent attachment to the building structural columns. The same cylindrical forms used to pour each floor's height of the building's columns are also utilized as hydraulic cylinders to lift the forms, and connected floor slabs, upon the previously hardened column sections to the next higher floor level where the process is repeated until the entire building structure of columns and floors is in place.

Abstract: A lifting cushion apparatus is equipped with five inflatable compartments. Each of the compartments extends the full length of the cushion and is connected to adjacent compartments by air ways. Several cushions may be connected to a common source of compressed air. The cushions may be stacked with the compartments interconnected in the vertical direction by apertures. In use, a load supported on the lifting cushion apparatus remains substantially stable as the device is inflated to elevate the load.

Abstract: The present invention relates to a jacking system for use in the construction of buildings or other structures in which accurate control and synchronization of lifting points is required. The system is mainly used in lift-slab and lift-plate construction with permanent or removable columns and features an arrangement of converging control wires which activate sensing apparatus. The sensing apparatus controls hydraulic pumps placed at each or plural lifting points.

Abstract: A vehicle lift having two hydraulically operated lifting cylinders for adjusting the height of a pair of weight supporting carriages, and having a control system featuring a cable strung between the carriages for responding, through changes in tension, to a change in relative vertical displacement between the carriages to actuate a levered valve assembly for controlling the rate of fluid being supplied to or from each lifting cylinder to eliminate the change and restore the preferred relative displacement between the carriages. The control system deactivates the lifts and effects engagement of safety latches to lock the carriages in place in their respective frames to limit misalignment thereof in the event of a control system malfunction. A fluid shuttle valve having a perforated cylinder which is both rotatable and translatable within the valve body to control fluid flow to and from each lifting cylinder is also featured.

Abstract: The invention relates to an arrangement to obtain an equal travel of hydraulic cylinders, particularly on behalf of a hydraulic car lift hauling at least two single acting lifting cylinders, powered by a common pressure source and with which a lifting platform can be moved which is maintained in a substantially horizontal position by means of the equal-travel arrangement, to which end both cylinders are connected to a control arrangement which itself is controlled by a leveling arrangement which is influenced by the position of the platform.

Abstract: In a lift wherein a carriage is raised up a mast by at least one cable, a safety device is proposed which is attached to the mast and which comprises a push member, which is urged towards the cable so as to press sideways against it, so that if the cable slackens the push member moves sideways, and a safety switch, which is so positioned that when the cable becomes slack the push member in its movement sideways actuates the switch.

Abstract: A swing-arm device for a two-pillar vehicle lift is disclosed, which comprises a first arm fixed pivotally about a vertical axis at its one end to a carriage which rides up and down on a pillar of the lift, and a second arm fixed pivotally about a vertical axis at its one end to the other end of the first arm remote from the carriage, the other end of the second arm remote from the first arm supporting the under side of the vehicle. Further, locking devices are provided which lock the pivoting of the first arm with respect to the carriage, and of the second arm with respect to the first arm.

Abstract: This specification discloses a jack capable of raising an object from ground level height to a predetermined height characterized by a superstructure that includes a base and a strong member above the base and connected thereto, the strong member having the plurality of stations at predetermined heights therealong; a lift bar for lifting the superstructure and the attached object; top fastener for fastening the lifting bar so as to prevent movement upwardly past the predetermined station on the superstructure; connecting means for connecting the superstructure with the object; extensible leg having a plurality of stations therealong and being slidably disposed in an aperture through the base; bottom fastener for fastening the base along the leg at a predetermined station to prevent downward movement past the station; a jacking means for raising the object by forcing the extensible leg and the lift bar apart so that by one or more cycles the object can be raised at a predetermined height by the jack.

Abstract: A small vehicle lift particularly adapted for motorcycles is disclosed. It includes a superstructure with depending connectors at front and rear for suspending the vehicle, and the entire superstructure is raised and lowered by means of a pair of fluid actuated cylinders included in a pair of floor-mounted upright supports connected to the superstructure and spaced apart on either side of the vehicle. Means are provided for locking the superstructure in the raised position.

Abstract: A vehicle support for use in a vehicle lift having a carriage sliding up and down a pillar, which comprises a supporting platform pivotally attached to the ends of supporting arms which slide in support tubes attached to the carriage.

Abstract: The apparatus of this invention relates to a platform device for lifting the side of a hopper wagon to facilitate discharge of fluent material, such as grain, therefrom. The apparatus includes a horizontal platform device onto which a wagon may be moved, the platform device having stationary and vertically movable sections. The movable section is positioned to support the front and rear wheels on one side of the wagon disposed on the platform device. The movable section in its first position is level with the stationary section and in its second position is elevated thereabove. A pair of power-lifting mechanisms is connected to and support the opposite end portions of the movable section to maintain the latter level and selectively to raise it above the level of the stationary section. The power-lifting mechanisms each include two upright telescopically engaged guiding tubes having upper and lower ends, respectively.

Abstract: A hydraulic synchronizing system which comprises a double piston power source and a drain valve in fluid communication with the hydraulic lift cylinders of a vehicle mounted vibratory seismic energy source. The double piston power source supplies the hydraulic lift cylinders with substantially equal volumes of hydraulic fluid, and the drain valve adjusts the flow of hydraulic fluid out of the hydraulic lift cylinders. The system synchronizes the operation of the hydraulic lift cylinders and thus coordinates movement of the vibrator guide rods relative to the vehicle upon which the vibrator is mounted.

Abstract: A braking and stabilizing system for a boat in a water channel, including boat lifting apparatus in the water channel engageable with the bottom of the boat, and including inflatable bags connected to the boat lifting apparatus for moving same upwardly to lift the boat while stabilizing same.