Commercial lifting device-power unit with slide forward bridge
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United States of America Patent
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Dec 20, 2016
Grant Date -
May 7, 2015
app pub date -
Nov 4, 2013
filing date -
Nov 4, 2013
priority date (Note) -
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Abstract
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.
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