Patent ID: 6648299
Filing Date: 2003-11-18
Classification: B66F

Abstract:
A pair of leveling pads for the forward ends of a pair of lift arms of a power unit for use with a jack stand and for use with a lift bridge, with the power unit including a chassis having a forward end and a rearward end, a pair of parallel lift arms having upper surfaces, forward ends and rearward ends thereof with the forward ends having horizontal apertures therein, and with the rearward ends pivotally retained within the rearward end of the chassis, a pair of pivotal connecting arms acting in parallel having forward ends pivotally connected to the forward end of the chassis and having rearward ends pivotally connected near the midpoint of the respective lift arm, a hydraulic actuator mounted on the chassis and connected to the lift arms for rotating the forward ends of the lift arms upward and downward, and the lift bridge having a horizontally oriented rectangular plate with forward end rearward ends, left and right sides, top and bottom surfaces and adapted to be positioned to bridge between the forward ends of the lift arms, each of the leveling pad comprising:a vertically oriented rectangular plate having an upper surface aligned with the upper surface of the lift arm, a forward end and a central horizontal aperture therein pivotally attached coaxial with the aperture of the respective lift arm; a lever arm extending forward and downward from the forward end of the plate; and a connecting rod interconnecting the end of the lever arm to a point on the pivotal connecting arm, so that as the angle between the lift arm and the connecting arm increases, the angle between the lift arm and the lever arm decreases so that the upper surface of the leveling member remains horizontal during the elevation of the lift arm.