Abstract: A load-bearing plate is mounted by a plurality of pivotal links above a base plate, and solely for vertical movement toward and away from the base plate. An intermediate frame including two, spaced, parallel side bars is supported by the links between the two plates for swinging movement on the base plate about a pair of spaced, parallel axes. Driving means, such as a hydraulic screw jack is mounted between the two side bars for swinging movement therewith, and has a reciprocable piston rod attached to one of two, parallel shafts mounted at opposite ends in slots in the side bars to reciprocate longitudinally of the bars during the raising and lowering of the load-bearing plate. The reciprocable movement of the two shafts oscillates the links which in turn cause the load-bearing plate to reciprocate only vertically relative to the base plate.

Abstract: A horizontally rotatable and vertically elevatable power boom and a hose support system for industrial vacuum loaders and cleaners are disclosed. The boom includes a link providing increased lifting torque about the boom hinge pin and the boom assembly is designed for minimizing the head room requirements for the vacuum machine without sacrificing payload capacity. The link also permits the boom to be locked down hydraulically for traveling. The free end of the boom supports a pulley and cradle system for supporting the vacuum cleaning hose. The cradle prevents kinking and tearing of the hose by supporting the hose at different positions along the hose length at various boom heights. When the boom is raised, the cradle automatically shifts position to support the bent portion of the hose throughout the curvature of the bend.

Abstract: A scissors jack for raising motor vehicles and the like comprises two pairs of links forming an angle with each other in substantially a common plane and pivotally connected with each other at their free ends. The links in each pair are also pivotally connected with each other on a pivot axis, and an actuating fluid power cylinder is mounted between said pair of pivot axes of the pairs of links for varying the distance therebetween. The improvement consists therein that the two pairs of links are turned in the same direction and that the fluid power cylinder is located in its entirety between said pairs of links and adapted to spread apart said pivot axes when raising.

Abstract: This invention is directed to a wheel-mounted portable jack which is capable of lifting large objects from a minimum ground clearance to a considerable height without resetting. The structure of the jack includes an upper member and a lower frame member pivotally attached together and movable between a normally contracted position and an expanded position under the control of lift means extending between a base and the upper frame. The lift means is operative to actuate the frame members simultaneously to advance from a collapsed or closed position in which the frame members are in parallel, horizontal relation to each other to an extended or open position in which the frame members approach a vertical, straight line relation to each other resembling the opening of a set of jaws. The jack includes a self-contained power source, drive means, and control apparatus as well as an apparatus for lifting the rear end of the jack for alignment purposes, a handle, and wheels for convenience in transporting the jack.

Abstract: A pneumatic vehicle jack comprises a jack cylinder with a body and a piston rod assembly movable relative to each other, two levers pivoted to said body or piston rod assembly, located on either side of the longitudinal axis of the jack cylinder and carrying vehicle and ground engaging shoes, and two struts pivotally mounted between said levers on the one hand and said piston rod assembly or cylinder body on the other hand. A cartridge of compressed gas can be removably connected to said jack cylinder for actuating the same. Actuation of the jack cylinder causes the pivot points of the levers and struts to be brought closer together, to move the shoes away from each other. At the beginning stage of the actuation movement, the lever system comprising the levers and struts reduces the force exerted by the jack, and at the end of the said movement it increases said force.

Abstract: A jack member onto a pair of which members a vehicle can be driven and then raised to a position inclined to the horizontal. The jack members are used more particularly for stowing vehicles in containers on a number of support frames. The jack members raise the vehicles so that they are supported at an angle to the horizontal with their wheels held in wheel support cradles attached to the frames. The jack members each comprises an approach ramp and a lifting ramp pivotally connected at one of their ends on which the vehicle is initially aligned and supported prior to being elevated at one end for inclined support on the vehicle frame.

Abstract: The disclosure relates to a handling jack for large truck gear boxes, such as third members or the like; the handling jack being adapted to move into position beneath a truck and being provided with a normally vertical column which is adapted to be pivoted on a horizontal axis at a low lever away from a position over the frame of the jack so as to be moveable into position beneath a truck and retractable from a position beneath a truck; and the column member being moveable into vertical position and provided with a handling boom thereon so as to position the handling boom above a truck gear box or third member assembly so as to freely suspend the third member and allow angular freedom of movement thereof for readily removing and replacing the gear box or third member.

Abstract: A cargo loading vehicle which has a lifting platform for raising cargo to an aircraft door. The platform is raised by means of a scissor lift which incorporates a knuckle joint in each of the scissor legs. The knuckle joints can be pivoted independently under power which adjusts the level of the platform.

Abstract: The invention pertains to a loading platform for a truck. Said platform is carried by the truck by a set of levers actuated by at least one hydraulic jack. A further hydraulic cylinder acts on said levers, said cylinder having a first and a second chamber, respectively containing a first and a second piston. The rod of the first piston extends into the second chamber while the rod of the second piston is pivotably connected to the platform. The cross-sectional surface of said first piston is larger than that of said jack, while the cross-sectional surface of the second piston is larger than that of the rod of the first piston but smaller than that of the latter.

Abstract: A device for installing rocket engines supported at a cant relative to vertical, an axially extensible, tiltable pedestal, a lifting platform for supporting a rocket engine at its thrust chamber exit, including a mount having a concentric base characterized by a concave bearing surface, a plurality of uniformly spaced legs extended radially from the base, and an annular receiver coaxially aligned with the base and affixed to the distal ends of said legs for receiving the thrust chamber exit. The lifting platform rests on a seat concentrically related to the pedestal and affixed to an extended end portion thereof having a convex bearing surface mated in sliding engagement with the concave bearing surface of the annular base for accommodating a rocking motion of the platform about an axis angularly related to the longitudinal axis of the pedestal, whereby excessive asymmetric loading on the thrust chamber is avoided.

Abstract: A device for releasably holding a movable body in a given position with respect to another body includes a pair of opposed mutually spaced end walls and a pair of opposed mutually spaced fixed walls extending between the fixed to the end walls to form therewith a frame which surrounds a given space. A control plate is situated in the latter space for movement between the end walls in a clamping direction or in a non-clamping direction, and on opposite sides of the control plate are a pair of parallel clamping plates which are parallel to the control plate while being spaced therefrom.