Abstract: A lift platform sustained through a double system of support scissors in its lower part, which offers the mechanical upward and downward motion in a vertical plane and on a base frame, which in its turn is activated by a hydraulic mechanism. The lift platform is characterized because it also includes a hydraulic unit which operates electronically to automatically control the desired position in its upward or downward motion originated by the movement of the mobile arms of the scissors on a track in the horizontal plane.

Abstract: A device for opening a scissor-type jack with paired cross-bars, the device having a chamber of variable volume connected to fluid inlet and outlet provided by end plates to which two cover plates are fixed. The first cover plate has two flanges disposed on the opposite sides of the cover plate and extending to a second cover plate and are connected for rotation of the first cover plate to the cross-bars. The second cover plate has two flanges. The distance between the two flanges is smaller than the distance between the flanges of the first cover plate and the flanges of the first cover plate are coaxially connected for rotation to the inside surface of the outer cross-bars, while the flanges of the second cover plate are coaxially connected for rotation to the inside surface of the inside cross-bars. In this way the axis of the rotary connection of the two cover plates to the cross-bars, intersects a line joining the centroids of the two end plates.

Abstract: A device for transporting workpieces to be machined and worked having a base housing or frame which may be moved on wheels and a bed which holds workpieces. The bed is connected with the base frame via a scissors mechanism and can be raised by the scissors mechanism. The scissors mechanism comprises arm braces wherein one arm brace at one end is pivotally connected to the base housing and the other arm brace on one end is pivotally connected to the bed wherein the arm braces are connected to each other at approximately the center thereof via a shaft. The wheels are mounted on the shaft which connect the arm braces and the wheels are pushed out of the base housing as the bed is lowered. The arm braces on the other end opposite the pivotal connections have a free end comprising a sliding foot which slides on the housing floor. In the resting position, the sliding foot engages under a cross rod lying above the housing floor.

Abstract: A portable surface lift for a vehicle and a pair of manually retractable wheels respectively attached to a mid-portion of opposite sides of the lift for rolling the lift over a garage floor surface when the vehicle is not lifted on the lift. The lift has fixed pads for contact with the undercarriage of the vehicle, and a hydraulic cylinder raises and lowers the vehicle on the lift. Arms are pivotally attached to opposite sides of the lift with a wheel at the end thereof for manual movement between a wheel-retracted position and a wheel-extended position. The wheels remain in the extended position by an over-center pivoting design. Two towing mechanisms are provided for moving the lift: a towing bar that can be attached to a towing bracket on an end of the lift, or a wheeled towing dolly having a clevis and securing pin for attachment to the towing bracket. The lift has a safety locking mechanism for securing the lift in various raised positions.

Abstract: The present invention provides for the conversion of a manual-type ambulance cot to electromechanical usage. In a manual-type cot having a wheeled undercarriage, a cot frame, scissor-action collapsible legs and an extensible member associated with the undercarriage so that extension and retraction of the extensible member raises and lowers the cot frame, the improvement of the present invention includes a linear actuator attached to the extensible member and powered by a high energy density gelcel-type battery. Manual lifting of the cot frame is replaced by electromechanical raising and lowering so that lifting injuries may be avoided.

Abstract: A simplified, convenient and compact multi-storied parking and/or displaying rack being collapsible and movable is provided. The rack includes at least two vertically spaced parking/displaying members each of which includes a first end, two opposite sides and a second end, at least a vertically moving mechanism mounted between the two members for moving them apart from or toward each other, and at least a positioning mechanism mounted on the moving mechanism and capable of holding the two members in a vertically spaced relationship.

Abstract: An automatic leveling system for a four-wheel vehicle system having outrigger assemblies at each of the four corners of the vehicle chassis and in which each outrigger assembly has an outrigger pad and a hydraulic cylinder for moving the pad downwardly and upwardly relative to the ground. The leveling system includes a low-pressure high-flow source of hydraulic fluid which is connected for one-way flow into the head ends of all four of the cylinders to lower all pads to the ground and then maintain them in contact with the ground. A level sensor senses the relative levelness of the right front and left rear corners of the vehicle and high-pressure low-flow hydraulic fluid is connected to the head end of the cylinder at the lower of those two corners to raise that corner of the vehicle relative to the ground.

Abstract: An apparatus for performing Trendelenburg therapy and reverse Trendelenburg therapy includes an intermediate frame carried above a base frame by an inner cross-riser pivotally connected to an outer cross-riser. One end of the outer cross-riser to pivotally connected to the base frame, and the opposite end of the outer cross-riser is rotatably and translatably connected to the intermediate frame via a cam and cam follower arrangement in which the cam follower rides on a wear plate. One end of the inner cross-riser is pivotally connected to the intermediate frame, and the opposite end of the inner cross-riser is both rotatably and translatably connected to the base frame via a cam and cam follower arrangement in which the follower rolls against a lower wear plate.

Abstract: A wheelchair lift for tilting a wheelchair and occupant backwards to a position for having his or her hair dressed or dental work or the like performed includes a pivotable frame onto which the wheelchair is rolled and secured. The lift also includes a fixed frame, a telescoping arm pivotally attached to the fixed frame and to the rear of the pivotable frame, and an electric motor drive which retracts and extends the telescoping arm to pivot the pivotable frame and wheelchair attached thereto about a pivot axis where the pivotable frame and the fixed frame are connected. The pivotable frame includes a horizontal section and an upright section which are connected at the pivot axis. The upright section includes a headrest which is adjustable.

Abstract: Arrangement for a lift adapted to a motor vehicle, comprising a lifting platform capable of moving between the vehicle and a floor. The invention provides a simple device for achieving a reliable and efficient lift arrangement, for example, for use by individuals in wheelchairs who wish to move between the inside and the outside of a vehicle without the help of an assistant, and without additional ramp or lift arrangements. The platform is attached via a scissor mechanism to a source of power for the platform, so that the platform, upon actuation of the power source, moves between a lower and an upper position, one of which at least is situated at a different level with respect to that of the attachment of the scissor mechanism to the source of power.

Abstract: Portable car hoist convertible to a trailer which has wheels for towing a vehicle. The hoist includes a trailer with a suspension, a wheel assembly, a base frame assembly, a liftable platform assembly, and a lift apparatus. A foldable ramp, a platform, and extension channels support a vehicle to be lifted, and a chock assembly retains the vehicle on the platform. A safety latch prevents accidental lowering of the platform assembly.

Abstract: A scissor mechanism is provided with two scissor arms (1,2) and a hydraulic cylinder (12) which extends between engagement points on the scissor arms (1,2) which are offset from the common bearing (3) of the scissor arms. Between the scissor arms there is provided a wedge mechanism (18,19) comprising a pressure roller (18) and a pressure wedge (19). The pressure roller (18) is mounted on a displaceable sleeve (15) which serves as the engagement point for the hydraulic cylinder at one of the scissor arms (1). By displacement of the sleeve (15) the scissor arms (1,2) are wedged out of their originally parallel position (FIG. 1).

Abstract: A container handling apparatus having a pair of side frames and a cross frame. The apparatus also has four lift mechanisms for attachment to a container. Each lift mechanism is mounted on one end of a secondary lift arm. Four primary lift arms are connected to the side frames and to the midpoint of each of the secondary lift arms. A cam follower on the lower end of each secondary lift arm follows a cam horizontally along one of the side frames. Hydraulic cylinders rotate the primary lift arms about a pivot connection to the side frames. This causes the upper ends of the secondary lift arms to move vertically to raise and lower the lift mechanisms and the container. Transducers connected between the primary arms and the side frames equalize the amount of rotation of each of the primary lift arms and automatically keep the positions of the four lift mechanisms at the same height.

Abstract: FIGS. 1-5 show a device (10) for selectively lifting and tilting a wheelchair (14) and its occupant to a convenient position for performance of a service, such as a dental work or beauty salon work, upon the occupant of the wheelchair. An alternative embodiment of the invention is wheelchair handling device (110), which is disclosed in FIGS. 6-10, inclusive. Device (110) comprises housing (102), wheelchair receptacle (104), backrest (106), wheels (108 and 113), foot-operated control box (112) having dual footpad switch (114) for raising and lowering housing (102) and dual footpad switch (116) for tilting the receptacle (104) forward and backward. Switch (114) operates motor-driven lift system (118), which comprises a pair of scissors jacks (136) and vertical worm gears (134 and 135) driven by a chain (126) and reversible motor (122).

Abstract: An elevating apparatus including a base, a platform, at least a pair of pivotally interconnected boom assemblies connecting the base and the platform together, the pair of boom assemblies including a pair of hollow middle booms pivotally interconnected substantially centrally thereof by a shaft, and upper and lower booms telescopically disposed in each of the middle booms and movable out of upper and lower ends of the middle booms, the lower booms having ends pivotally mounted on the base in spaced relation and the upper booms having ends pivotally mounted on the platform in spaced relation, each of the boom assemblies including a synchronizer for synchronizing intervals of extension of the upper and lower booms from the middle boom, a pair of hydraulic mechanisms operatively coupled between the shaft and the base at spaced locations thereon for moving the middle booms to displace the upper and lower booms into and out of the middle booms to lift and lower the platform, and a controller for selectively contro

Abstract: A hoist mechanism is provided that includes a first and a second lifting arm connected at a first pivot point, a hydraulic cylinder connected to said lifting arms, and a stop located on one end of the second lifting arm. During the initial lifting of the hoist mechanism the first arm remains stationary as the second lifting arm rotates around the first pivot point. The hoist mechanism functions in this manner until the two lifting arms reach a predetermined angle with each other. When the lifting arms reach this angle, the stop acts to convert the action of the hoist mechanism into that resembling a scissors hoist, with both lifting arms rotating, as the hoist mechanism is further extended. The hoist mechanism is designed such that the effective length of the second lifting arm is constantly increasing as the second lifting arm rotates from the rest position to the predetermined angle.

Abstract: Lifting device or load-supporting apparatus for use in workshops. The apparatus is connected to a stand arranged on the floor by means of scissor-like connecting rods, at least two of the connecting rods are each coupled to an axle carried by the stand. The height of the rods are adjustable via at least two spring units which has a completely relaxed starting position. The two spring units are each connected to a bearing and an abutment over the entire lifting height of the load-supporting apparatus. A locking apparatus is associated with the spring units which permits the starting position of at least one spring unit to be fixed at different lifting heights.

Abstract: A mobile loader of the type used for loading and unloading the cargo holds of aircraft is described. The loader operates by electric motors driving both traction apparatus and loading platform elevation.

Abstract: A cart having a frame, front and rear wheels, and a handle. A pair of elevating link mechanisms are mounted on the frame, each comprising a pair of arms pivotally connected to each other at intermediate positions thereof, rollers are provided on both ends of each of the arms, lower rollers are mounted on rails provided on the frame. A carrier is engaged with upper rollers of the link mechanisms by guide rails. A hydraulic jack is vertically provided on the frame, a ram of the jack engages with a ram receiver supported on two corresponding arms at lower portions thereof and rotatable about lateral axis. A pump is provided for supplying liquid to said hydraulic jack. The elevating link mechanisms are extended by projecting the ram of the jack for elevating the carrier.

Abstract: The truck comprises a rigid basic frame mounted on wheel pairs, at least one of which is a driving pair, to the basic frame longitudinal stringers there being slidably connected, through a cylindrical articulation, respective ends of two bar pairs crossing each other and mutually articulated, the opposite ends of the bar pairs being coupled to two additional longitudinal stringers interconnected by crossbeams.

Abstract: A patient lifting table includes upper and lower platforms with a connecting scissors linkage mechanism providing straight upward and downward movement of the upper platform. The scissors linkage mechanism has first and second link arms pivotally connected at intermediate portions and which form an X when extended. The lower end of one of the link members has a bell crank arm extending therefrom and situated on the underside of the lower platform. An extensible and retractible ram is also mounted generally below the lower platform and is pivotally connected to the bell crank arm whereby operation of the ram causes the link members to swing relative to each other and cause the upper platform to raise and lower. All of the ram and bell crank assembly is mounted below the generally planar, obstruction free upper surface of the lower platform for ease of cleaning, thereby making the lifting table particularly suited for hospital and veterinary operations.

Abstract: A lift consists of a platform that the article to be lifted rests on and a scissors jack that is attached to the bottom of the platform and that can be spread up out of an extended position with rollers. One pair of the parallel scissoring legs of the jack is firmly articulated with the platform and the other pair of scissoring legs is attached to a shaft that travels parallel to the bottom of the platform inside a guide mounted on it. Rollers are mounted on a rigid axle and the axle is engaged by two chains that wrap around chain wheels rigidly attached to the shaft and which are connected to a transverse beam. The front end of the transverse beam is connected to a tensioning device that operates parallel to the platform. Two independently rotating rollers are mounted on the axle on each side of the jack, each roller rests against an auxiliary rail and a guide rail on each inside scissoring leg and the auxiliary rails are inside the jack.

Abstract: An auxiliary lift adapter (10) comprises spaced, parallel top load beams (40), bottom load beams (30) positioned beneath the top load beams, and scissors mechanisms (50) for raising and lowering the top load beams (40). Each scissors mechanism (50) comprises an exterior arm (52) pivotally connected to its bottom load beam (30) and slidably connected to its top load beam (40), an interior arm (54) pivotally connected to its top load beam (40) and slidably connected to its bottom load beam (30), and a pin (56) pivotally interconnecting the midpoints of the arms. Hydraulic cylinders (76) are provided for actuating the scissors mechanisms (50) and include safety locking valves for preventing operation of the cylinders in the event of loss of hydraulic pressure.

Abstract: An aircraft engine maintenance stand, particularly for the C-130 cargo aircraft having external fuel tanks, having two independently adjustable working platforms and a fixed working platform that straddle an aircraft engine or other device attached to an aircraft wing. Each adjustable platform is attached to a hydraulic lifting device that is further attached to a support structure. The stand provides complete access to the engine without moving even when the A-frame hoist is positioned in front of the engine.

Abstract: A vehicle and method for raising elongated objects, especially for raising pipes and the like to a ceiling structure in the construction of a building. The vehicle has a pair of transversely extending support stands and a lift such as a scissors lift adjacent each. On top of each lift is a saddle for supporting an object to be raised and a transversely extendable rod with a hook end. A platform may be removably attached to each lift. In the method of operation of the invention to lift an elongated pipe, the rod and the lifts are utilized to engage a pipe in a stockpile and lift the same onto the support stands. Thereafter the lifts are lowered, the elongated pipe is rolled to be over the saddles of the lifts, and the lifts are raised to raise the pipe up to its desired position in the ceiling structure.

Abstract: A ream collection lift table and asssociated transfer conveyor system are contained in a unitary assembly which is mounted beneath a sheet discharge end of a sheeting machine. The lift table portion utilizes a scissors-elevating structure for reciprocating a sheet collection surface. The elevating structure includes criss-crossed, collapsible scissors arms, each provided with shaped profile surfaces for engagement with a laterally movable roller driven at constant speed, whereby the collection surface descends at varying rates. At a lowermost position, the collection surface deposits a collected ream onto a laterally directed belt conveyor, positioned intermediately of the integral assembly. The belt conveyor deposits the collected ream onto the receiving surface of an orthogonally directed slat conveyor for transferring the ream to a cartoning station off to one side of the sheeting machine.

Abstract: Lifting apparatus comprising a foundation, a platform, and a lifting mechanism of pantographic type disposed between the foundation and the platform. The lifting mechanism is constructed with a plurality of superimposed X-link units, each of the X-link units comprising a pair of link levers rotatably connected to each other at a central portion to form an X-link. A lever arm is rotatably provided between the central portion and an end of the one of link levers, and driving apparatus is provided on the one of link levers for rotating the lever arm. One end of the lever arm is engaged with the other link lever connected with the end of the link lever carrying the driving apparatus, whereby the rotation of the lever arm expands the lifting mechanism of pantographic type.

Abstract: A lifting apparatus having a carriage, a pantograph comprising a plurality of X-link units provided on the carriage, and a platform provided on the pantograph. Each X-link unit comprises a pair of outer pipes rotatably connected to each other at a central portion to form an X-link and a pair of inner pipes slidably inserted into each of the outer pipes from the opposite ends. The end of the each inner pipes of the lowermost X-link unit is connected to the carriage and the end of each inner pipe of the uppermost X-link unit is connected to the platform. Driving means for extending and retracting each inner pipe is provided in each of the outer pipes. The pantograph is extended by extending the inner pipes for elevating the platform.

Abstract: A hoist mechanism that more effectively uses its hydraulic capacity is comprised of a first and a second pair of lifting arms connected at a first pivot point, a hydraulic cylinder connected to said lifting arms, and a pivoting stop means that coordinates movement of the two pair of lift arms. During the initial lifting action of the hoist, the mechanism achieves the advantages of a double arm type hoist by causing the first pair of lifting arms to remain stationary while the second pair of lifting arms rotates around the first pivot point. After the second pair of lift arms reach a predetermined angle with the stationary first pair, the stop means are engaged in a way to cause both pair of lift arms to move upon further lifting action of the hoist, thus achieving the advantages of a scissors type hoist from this point on.

Abstract: Method and apparatus for loading and unloading a bulk curing tobacco barn so that large heavy containers filled with tobacco leaves will be properly positioned in the barn in a close front-to-back relationship.

Abstract: A system for allowing a wheeled truck to cooperate with a relatively stationary lift table assembly, in order to selectively raise the truck during various material handling operations. The lifting combination essentially comprises a vertically extendable lift table assembly which cooperates with a wheeled truck which can be selectively superposed upon the lift table assembly. The lift table includes a scissor jack linkwork, and can be easily positioned, as necessary, within a material handling space. The wheeled truck includes means to engage guideways on the lift table assembly, as the truck is wheeled thereover to its selective engagement position.

Abstract: A vehicle and a platform and means for lifting said platform relative to said vehicle. Lifting mechanism comprising four pairs of linkages, each defining isosceles triangles placed longitudinally on top of said vehicle and defining the shape of said platform. Front, intermediate and rear balance linkages connecting the upper ends of the links of the four pairs of linkages by common lateral connecting rods. The pairs of isosceles triangles being clevace mounted to the top of a ball bearing actuator nut assembly driven by a 12 volt motor through a central bar that is fastened on each end to the right and left-hand linkages assemblies; and limit switches to control the upward and downward movement of the platform.

Abstract: A dock lift has a platform connected at each side to a frame by a scissors apparatus. At one end, a pair of crossed hydraulic cylinders connect the platform and the frame. The hydraulic connections to the cylinders are made so that a load imposed on one side of the platform imposes a load on one cylinder which cylinder in turn causes fluid pressure to be applied to the other cylinder in the sense such that the other side of the platform is drawn downwardly to aid in maintaining the platform approximately level.