Patent application number | Description | Published |
20080302206 | Handle control knob with automatic return for hydraulic power unit - A rotatable control knob with automatic return, controls a valve of a hydraulic cylinder on a jack-stand power unit or a floor jack. The power unit includes a frame having the hydraulic cylinder secured at the rearward end. The control valve is rotatable in one direction for closing the valve to extend the cylinder, and is rotatable in a counter-direction for opening the valve to retract the cylinder. A tubular handle with a T-bar hand grip extends rearward and upwardly from the frame, with the control knob extending from the T-bar hand grip, and connected to a control shaft extending through the tubular handle to the control valve of the cylinder. The control knob automatic return, includes a torsion spring having one end fixed to the control knob and the other end fixed to the tubular handle. The control knob can be rotated in the counter-direction to open the valve; and when the knob is released, the torsion spring automatically forces the knob and shaft to rotate back to the original position to close the valve. | 12-11-2008 |
20080303008 | LIFTING DEVICE WITH SECURELY FASTENED LIFT BRIDGE - A two-position lift bridge is used with a jack-stand power unit including a forward end, a rearward end, a pair of upward side flanges, with the rearward end having a hydraulic cylinder. A rear cover plate extends horizontally from the side flanges and over the cylinder, and has vertical apertures for positioning the lift bridge, and has a threaded vertical aperture for securing the lift bridge. The frame has a pair of parallel lift arms having forward end that are extendable by the cylinder. Each forward end has a leveling pad pivotally attached having an outwardly extended flange, and one having a vertical aperture and a threaded aperture. The lift bridge includes a rectangular plate one side having downward extending corner flanges with horizontal openings for engaging one of the outwardly extended flanges of the leveling pad. The other side of the plate has a pin extending downward for engaging the aperture in the other leveling pad, and includes a vertical aperture that is aligned with the threaded aperture of the leveling pad for receiving a fastener. The lift bridge can be stored on the cover plate and secured with the fastener. The lift bridge can be positioned on the forward ends of the lift arm by placing the corner flanges on the outward flange of one leveling pad, then positioning the downward pin into the aperture in the other leveling pad, and secured with the fastener. | 12-11-2008 |
20080303009 | Mechanism for positioning the handle of a power unit and floor jack - A hydraulic floor jack has a tubular handle with a yoke at the distal end thereof with lateral axels pivotally attached to a pair of vertical side brackets. One side brackets has a series of arcuate upper surfaces concentric with the lateral axel of the yoke, including a large radius forward portion, then a small radius arcuate notch portion, then an intermediate radius rearward portion. The yoke has a barrel aligned radially over the circular upper surfaces of the side bracket, with a plunger therein having an upper end extending above the barrel and a lower end for extending below the barrel and into the arcuate notch portion. A plunger control level has a rectangular distal end that is pivotally attached to the upper end of the plunger. The control lever can position the plunger to fully extended into the arcuate notch portion for fixing the movement of the tubular handle; and can position the plunger to partially extend into the arcuate notch portion for freeing the handle to pump the hydraulic cylinder; and can retract the plunger from the arcuate notch portion for folding the handle over the hydraulic jack. | 12-11-2008 |
20150122965 | Commercial lifting device-jack stand - A jack stand for use with a power unit having a slide forward bridge for positioning by the jack stand; and having a pair of leveling pads with inner roller bearings thereon for engaging an upper lifting plate of the jack stand, and a bottom plate having openings therein for engaging a mobile rack for transporting the jack stands. The jack stand has the bottom plate with a series of telescopic frames extendable therefrom, and the upper lifting plate extending from the upper frame, having side flanges with a rectangular bottom surface thereon for engaging the roller bearing of the power unit. A pair of bumpers are attached to the lowermost vertical frame with one extending forwardly and one extending rearwardly (one of which is always positioned) for engaging the slide forward bridge, as the jack stand is loaded into the power unit. The bottom plate has a pair of rectangular opening therein (one of which is always positioned) for engaging one of a plurality of rectangular fingers, extending from the platform of the mobile rack. | 05-07-2015 |
20150123051 | Commercial lifting device-power unit with bridge latching mechanism - A power unit has a frame with a bottom and a pair of lift arms with a cover plate, and a bridge. A lower latch member has a forward end, a middle portion and a rearward end with the middle portion pivotally connected near the lower inner side of one of the lift arms. The rearward end is angled downward, extending below the lower side of the lift arm. The rearward end is biased downwardly and is engagable with the bottom of the frame. The forward end has an upward finger with a beveled-up nose thereon that is engagable with a downward lateral flange at the forward end of the bridge. The bridge is retained by the forward end of the lower latch member, and whereby when the lift arm is lowered to the lowermost position, the forward end is automatically released. An upper latch member has a forward end, a middle portion and a rearward end, with the middle portion pivotally connected to a pivot arm extending downwardly from the cover plate. The forward end has a downward finger with a beveled-down nose thereon, that is biased downwardly and is engagable with an upward lateral flange at the rearward end of the bridge. The rearward end has a button extending upwardly through an aperture in the upper cover plate to release the upper latch member. | 05-07-2015 |
20150123052 | Commercial lifting device-power unit with leveling pads - A power unit includes a rectangular frame having a forward end for operating the jack stand; a middle portion for retaining the lifting mechanism; a rearward end for controlling the power unit. A pair of lift arms acting in parallel have forward ends, central portions and rearward ends and are interconnected at the rearward ends thereof by a lateral push bar. A pair of horizontally oriented U-shaped leveling pads each having an outer rectangular plate and an inner rectangular plate providing an open rearward end with the opening equal to the thickness of the lift arm, and forming a closed U-shaped forward end, and are pivotally attached at the rearward end thereof around the inner and outer sides of the forward end of the respective lift arm. Each outer rectangular plate of the leveling pad has a downwardly extended lever arm at the forward end thereof for connecting to a leveling link. Each inner rectangular plate has a rear cylindrical roller bearing mounted on the rearward end thereof, and has an adjacent forward cylindrical roller bearing mounted on the forward end thereof, with the roller bearings for engaging side flanges of a lifting plate of the jack stand, and for engaging sides of a slide forward bridge. | 05-07-2015 |
20150123053 | Commercial lifting device-power unit with slide forward bridge - A bridge traverses along lift arms of a power unit, having leveling pads with inner rectangular plates and roller bearings; and each lift arms has an inner slide plate. The bridge has the general shape of a rectangular block and has a first longitudinal recess in each side, having a width slightly larger than the width of the slide rail, and a depth equal to the thickness of the slide rail. The bridge has a second longitudinal recess in each side having a width slightly larger than the diameter of the roller bearings and a depth slightly larger than the thickness of the roller bearings. The bridge is biased in the forwardly direction along the slide rails by a rectangular pusher frame. The pusher frame has a pair of side plates, with each outer side having a longitudinal recess therein slightly larger than the width of the slide rail and a depth equal to the thickness of the slide rail. The pusher frame includes a pair of tension springs having one end connected to the forward end of the lift arm and the other end connected to the rear plate of the pusher frame, to bias the frame in the forward direction. | 05-07-2015 |
20150123054 | Rack for transporting jack stands - Each jack stand includes a rectangular bottom plate having a pair of rectangular openings therein. The rack has a rectangular platform having a lateral loading side, a width a little larger than the jack-stand-length, and a length equal to a multiple of the jack stand widths. A plurality of L-shaped fingers are located on the platform at points corresponding to the opening in the bottom plate, and extends upwardly and laterally toward the non loading side of the platform. Each finger has a rectangular upper surface thereon having a width and length slightly smaller than the width and length of the openings in the bottom plates; and creates an opening between the platform and the finger that is slightly greater that the thickness of the bottom plates of the jack stands. Each finger is for receiving one of the rectangular openings of the respective bottom plate onto the platform; and a lateral movement of the bottom plate in the direction of the lateral loading side of the platform is for locking the bottom plate under the respective finger and onto the platform of the mobile rack. The rack includes a pair of wheels attached to the rearward end of the platform, so that the platform engages the horizontal surface when the forward end of the platform is horizontal, and so that the pair of wheels engage the horizontal surface when the forward end of the platform is lifted at an acute angle. | 05-07-2015 |
20150123055 | Commercial lifting device-power unit with safety mechanism - A power unit (or a hydraulic floor jack) includes a rectangular frame with side flanges and has a tubular handle enclosing a control shaft and a control knob. A pivotal lifting mechanism is mounted on the frame including a pair of parallel lift arms having rearward ends interconnected by a lateral push bar. The forward ends (with the bridge) are rotatable upward for lifting a load as the push bar is translated forward within a pair of U channels tracks attached to the inner side flanges. A hydraulic cylinder has a ram for pushing the lateral push bar forward along the tracks for raising the forward ends of the lift arms, and has a releasable control valve for retracting the ram to lower the forward ends of the lift arms. The safety mechanism includes a toothed rack bar secured in the vertical wall of the racks. The lateral push bar has bore holes in the ends thereof. A cylindrical dog is slidably supported within each of the bore holes ad has a proximal end that is extendable for engaging a tooth of the rack bar. The dogs are biased into the extended position, and include release cables and linkage for releasing the dogs from the rack bar by rotating the control knob counter-clockwise. | 05-07-2015 |