Patent ID: 6679479
Filing Date: 2004-01-20
Classification: B66F

Abstract:
A scissor lift comprising:a frame; a deck moveable relative to the frame between an extended and a retracted position; a first leg supporting the deck on the frame having a first end pivotally attached to the frame, a second end slidably and pivotally attached to the deck, and an intermediate portion therebetween; a second leg supporting the deck on the frame having a first end slidably and pivotally attached to the frame, a second end pivotally attached to the deck, and an intermediate portion therebetween; wherein the second leg is transverse to the first leg and wherein the intermediate portions of the first leg and the second leg are pivotally connected about a first shaft; a means for applying a generally vertical force to the first shaft to move the deck between a retracted position and an extended position; wherein the means for applying a generally vertical force to the first shaft comprises: a bell crank mechanism comprising a first arm and a second arm extending from a fulcrum portion, the fulcrum portion pivotally attached to the frame; at least one hydraulic cylinder pivotally attached at a first end to the frame and pivotally attached at a second end to the first arm of the bell crank mechanism; and a connector member pivotally attached at a first end to the second arm of the bell crank mechanism and attached at a second end to the shaft.