Abstract: This invention relates to a jack of a pantograph type, especially to the improvement of pivot joint mechanism of jack comprising screw nut body engaged with screw, metal body having screw bearing hole and end portions of a pair of upper and lower grooved links, and constituted by combining the upper and the lower grooved links with the screw block in which the screw block having unidiameter passes through an inserting hole formed on two side wall portions of end portions of the upper and lower grooved links to extend the two end portions of screw block for projecting outwardly. In this state, a plurality of projections for stopping are formed by plastic working with separating each other around axial periphery on the portions of screw block adjacent to inner and outer face of two side wall portions of the upper and lower grooved links respectively.

Abstract: A scissor jack has a leg having a lower end adapted to bear on the ground, a support arm having a lower end pivoted on an opposite upper end of the leg at an intermediate horizontal axis, and a load-bearing member engageable with the vehicle body and formed on an opposite upper end of the intermediate support arm. Upper and lower links are pivoted together at another intermediate horizontal axis with the upper link also pivotal on the support arm between the ends thereof at an upper horizontal link axis and the lower link also pivotal on the leg between the ends thereof at a lower horizontal link axis. A jack screw is connected between the intermediate axes and can draw the intermediate link axes toward one another to raise the load-bearing member or separate the intermediate link axes to lower the load-bearing member. A foot piece can rock on the lower end of the leg relative to the ground about a lower horizontal foot axis as the leg is raised and lowered.

Abstract: An arm unit for use in a pantograph type jack wherein a main driving cam having an effective cam face constituted with an arc of a circle is formed to one side plate at the mounting end of a U-cross sectioned arm on the side of a bearing member with the effective cam face being protruded forwardly and upwardly from the mounting hole for the shaft bearing member, whereas a driven cam with a relatively moderate and long cam face different from the shape of the main driving cam is formed to the other of the side plates such that, when a pair of opposed arms is an identical shape pivoted to the bearing member are rotated in the directions opposing to each at an equal angular velocity, the main driving cam and the driven cam for each of the arms are faced and brought into engagement under contact with each other.

Abstract: A jack assembly which is adapted to engage a side frame of an automotive vehicle for the purpose of raising and lowering the same relative to its adjacent ground surface comprises a base for engaging the ground surface and which has a pair of upwardly extending sides having horizontally disposed slots therethrough, a main support link having one end pivotally connected to the sides of the base via a pivot means extending through the slots and having its other end pivotally connected to a screw nut means, a lift arm having one end pivotally connected to the main support link and its other end connected to a bearing means rotatably supporting a screw which is also threadably engaged with the screw nut means carried by the main support link, a positioning link having one end pivotally connected to the base and its other end pivotally connected to the lift arm and follower links having one end pivotally connected to the positioning link and its other end pivotally connected to the pivot means connecting the main

Abstract: A drive rod apparatus and method generates a drive feed which is dependent on the speed change of the load. The apparatus and method, which is preferably embodied in a lifting jack, includes a slidable drive screw and nut set.

Abstract: A screw bar for connecting a nut member and a bearing member of a pantograph-type jack includes a cylindrical-shaped bar member having a joint portion formed integrally with the bar member at one end and a threaded portion formed integrally on the bar member at the other end. The nut member of the jack is threadably engageable with the threaded portion of the screw bar, and the bearing member of the jack is pivotally mountable on the bearing support portion of the screw bar. The maximum outer diameter of the threaded portion is less than or equal to the desired diameter of the bearing support portion so that the bearing member can be mounted on the screw bar from the threaded-portion end. Preferably, the joint portion includes a flange portion having an outer diameter greater then the desired diameter and the bearing support portion is provided with a lug portion.

Abstract: The invention relates to motor driven scissors jacks for automobiles and is driven by the electric power source from the cigarette lighting socket of any automobile. Its DC motor is driven through a deceleration gear box for rotating a screw rod clockwise or counter-clockwise in order to provide for the raising of the frames of scissors jacks with automatic raising of vehicles and for the higher raising and lower collapsing functions and a more powerful raising capability. It is also provided with one ultimate switch for peak and low bottom points in order to limit its raising and collapsing operation to fixed points and an automatic stop for safe raising operations and for preventing damage to the motor.

Abstract: A theatrical stage, comprising a plurality of side-by-side, screw-operated shearlegs tables, each such table having its own operating mechanism connected to the operating vertical screw. The screw is pivotally connected to the shearlegs members by dual transmission members, by which movement of the table platform is made almost linear in relation to the rotation of the screw. The vertical movement of the platform of the shearlegs tables is synchronized by employing as operating mechanism, electro-hydraulic step motors for each table, with a brake mounted on each screw for arresting rotary motion of the step motor.

Abstract: A stand (10) is disclosed for supporting a computer display (8) workstation for easy adjustment without tools to a desired position by rotating the stand, tilting a platform (60) attached to the stand and lifting the stand. The stand comprises a six bar (20, 22, 16, 30, 32, 54) pivotable linkage having spring (44, 48, 52) means for compensating for the load, the spring force being adjustable to accommodate changes in load without affecting the spring rate.

Abstract: A vehicle lifting jack of the actuating screw type is provided with an integral stowable crank. The crank comprises an L-shaped member pivotally connected to a crank handle. These elements are foldable together and may be swung over the lifting jack for storage. These elements are unfoldable for cranking the actuating screw to raise and lower the vehicle lifting jack. When unfolded, the crank is adjustable to a cranking position wherein the cranking element is in substantial alignment with the actuating screw to facilitate cranking.

Abstract: A pantograph jack apparatus for elevating a motor vehicle includes first and second upper arms pivotally connected to a supporting plate engageable with the motor vehicle and first and second lower arms pivotally connected to a base plate supporting the jack apparatus at ground level. The first upper arm and first lower arm are pivotally connected to a threaded connecting nut that is threaded on the threaded portion of a shaft member. The second upper arm and second lower arm are pivotally connected to a connecting bearing rotatably mounted on the non-threaded portion of the shaft member. The connecting bearing is axially movable on the shaft member between two stop portions so that, when the connecting bearing abuts against the first stop portion, the jack is in its lowered position for storage and, when the connecting bearing abuts against the second stop portion, the jack is raised to a position where it is engageable with a jacking portion of the motor vehicle body.

Abstract: In the jack of the invention a chassis member of a small garden tractor, riding lawn mower or like vehicle is engaged by the free ends of a transversely spaced apart set of lifter arms pivoted at their opposite ends on the upper end of an upstanding end stand carried adjacent one end of a base frame of a sufficient longitudinal span to inhibit tilting upon the application of a load to the ends of the lifter arms. Lifting force is applied to the lifter arms by an upwardly extending screw actuated scissors jack seated at its lower end on the base frame and pivotally connected at its upper end to a lifter bar bridging between the lifter arms inwardly of their free ends through a pivotable connecting link forming with the scissors jack an expandable toggle linkage.

Abstract: Herein disclosed is a pantagraph type jack in which one of the support portions for supporting an actuating bolt forms a bolt-receiving nut. This bolt-receiving nut is equipped with a dump nut which is composed of a tapered bore and nut segments, and an actuating member which is composed of an actuating ring and a sleeve formed with openings, so that the turning operation of the actuating bolt can be omitted.

Abstract: A jack comprising a screw and a nut member, the displacement of which along the screw produces a change in the distance between the active portions of the jack. The jack has a catch which prevents collapse if the nut member, due to worn threads, loses its grip on the screw. The catch is achieved by dividing the nut member into a threaded load-carrying portion and a threaded portion which is axially unloaded during normal thread engagement and which follows the load-carrying portion and serves as a stop if the latter should lose its grip on the screw.

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: An antenna mount for use with a dish type antenna for variably positioning the antenna towards a predetermined point in the heavens. The mount comprises (a) an upstanding base means, (b) a telescopic tube in slidable and rotational engagement with the base for vertically and rotationally positioning the antenna along its verticle axis, (c) an elongated cross member attached to the vertically and rotationally positioning arrangement for variably positioning the antenna in the plane formed by the longitudinal axis of the elongated cross member and the mount's vertical axis and (d) a linkage-frame assembly attached to the cross member for variably positioning the antenna about the longitudinal axis of the elongated cross member.

Abstract: A car jack having a stand column secured at its lower end to a plate-like base and pivotally supporting an arm having a head for engaging a vehicle and adapted to be pivoted by a threaded spindle rotated by a hand crank, in which the base has relatively angularly disposed front and rear portions forming a transverse edge on which the jack tilts when raising, a car with a major portion of the front base portion underlying the stand column with the front base portion having a central supporting zone projecting downwardly below side zones with means at the side zones connecting the base to the stand column.

Abstract: A jack for raising car bodies in which a threaded-driven movable block screwed on a threaded rod is threadedly moved to cooperate with first and second link means to raise a lifting table adapted to be engaged with car bodies, the first and second link means establishes a proportional relation between the speed of upward travel of the lifting table and the speed of transverse movement of the movable block.

Abstract: There is provided a car jack comprising a column attached at its bottom to a base, and a load-carrying arm pivoted to the column and movable by a screw spindle. The screw spindle is pivotably supported by a nut at the top of the column and by an abutment of the load-carrying arm. The arm and the column are formed from metal sections of U-shaped cross-section with the edges of the side limbs outwardly bent. Each of the outwardly bent parts is formed as a bead extending along the entire length of the side limb with its edge disposed in the plane of the internal flat side of the respective limb.

Abstract: A vehicle jack having a support leg (10) on which is pivotable a support arm (23) by means of a threaded spindle (17) which is pivotally mounted in both the support leg and the support arm. A support plate (26) which may be provided with a depression (28) for receiving a fold (29) of a vehicle body is pivotally mounted on the free end of the support arm about a pivot axis (34).

Abstract: A lift for raising and lowering a vehicle door, bumper or other vehicle parts adjacent a vehicle when installing or removing the parts from the vehicle. The lift eliminates the need of physical labor to hold the door or bumper in place when performing body repair on the vehicle.

Abstract: A lateral support device for a nuclear fuel rack vertically positioned within a walled enclosure which provides a preload to maintain effective support. The device includes a scissors-jack which is mounted so that the drive screw is vertical. Upon rotation of the drive screw the jack expands horizontally, seating a load pad against a vertical wall. The load pad is affixed to the jack by an arm having a stack of spring washers which compress between the pad and the jack, thereby applying a selected preload.

Abstract: A vehicle jack in which a push rod is displaced during the later portions of the operation of the actuating member to tilt the support leg and bring into play an additional support surface for stabilizing purposes. The actuating member raises a lifting arm pivotally connected to the support leg and can be a threaded spindle.

Abstract: A ratchet type quick feeding mechanism for an automobile pantograph jack including a round bar having a ratchet screw portion, a pawl member for engaging the teeth of the ratchet screw portion, a connecting block carrying a horizontal shaft on which the pawl member is pivotally supported, and pantograph link assemblies for changing the height of the jack by horizontal shift of the connecting block.

Abstract: A manually-operable tool is provided for insertion between the inboard and outboard caliper-mounted disc brake pads for the purpose of spreading the pads to facilitate placement over the rotor. The tool employs a screw having an elongated partially-threaded shank and a handle at the rearward end for manually rotating the screw about its axis. Supported on a non-threaded portion of the screw shank is a pivot-stud body having pivot studs extending laterally in opposite directions. Supported on the pivot studs, on each side of the screw shank, is a pair of scissor-like jaw levers or spreaders. Supported for sliding movement on the screw shank rearward of the pivot-stud body, i.e., between the pivot-stud and the shoulder of the handle, is a shoulder-stud body having camming studs extending laterally in opposite directions into the rearward jaw openings of the scissor-like spreaders.

Abstract: A scissors jack is adapted to be mounted permanently to the bottom frame of a vehicle and enclose the working members of the jack in the closed position. Generally, four of these scissors jacks will be mounted on the four opposite corners of the vehicle to level and stabilize the vehicle when the jacks are extended to their open position. The scissors jack has two opposed pairs of channel-shaped scissors arms. Each pair of arms is pivotally secured at a first end of the arms with the second ends having teeth formed therein. The upper arms of each pair are hingedly connected to a mounting member with their teeth intermeshed and the lower arms of each pair are hingedly connected to a baseplate with their teeth intermeshed. The second ends are mounted in the baseplate and mounting plate by rivets and each pair of rivets has a strap secured on the inside thereof to keep the teeth engaged and to relieve the stress on the rivets.

Abstract: A pantograph jack having two pairs of arms includes gear teeth portions on one end of each of the arms. The gear teeth portions are formed on flange portions of the one end of each of the arms, and the flange portions are formed integrally with the arms each extending at a right angle therefrom.

Abstract: There is disclosed a scissor-type screw actuated jack arrangement having a floating load bearing plate centrally situated over supporting lift arms when in the fully extended position and a pair of facing U-shaped channel members coupled to opposite ends of the lift arms for carrying the bearing plate and screw.

Abstract: A shear-type vehicle jack has an arm articulated to a leg whose foot is provided with a rolling formation adapted to rest upon the ground and a larger locating portion. A crank rotates a thread spindle in a nut pivotally received in the upper end of the leg and engaging the arm with a bearing arrangement. The free end of the arm has carrying formations adapted to engage the vehicle chassis in a manner free from bending moments.

Abstract: A variable height work surface easily and quickly adjustable from a low profile to a desired level by utilizing double acting scissor legs controlled by a screw drive mechanism.

Abstract: A low profile lifting device having an elongated base, a rotatable shaft extending along said base, an arm having a nut at one end threadably mounted on the shaft and a lifting pad at the other end, means at one end of the base for rotating the shaft, a pair of side levers having one end pivoted to the other end of the base and extending to a pivotal connection at an intermediate portion of the arm, and means for preventing unwanted shaft rotation in response to weight on the lifting pad.

Abstract: A shear-type vehicle jack has an arm articulated to a leg whose foot is provided with a rolling formation adapted to rest upon the ground and a larger locating portion. A crank rotates a thread spindle in a nut pivotally received in the upper end of the leg and engaging the arm with a bearing arrangement. The free end of the arm has carrying formations adapted to engage the vehicle chassis in a manner free from bending moments.