초록 ▼

A workpiece lift including a pivotable boom with a pivot end that moves horizontally as the load end of the boom is raised and lowered, allowing the load end to move along a substantially vertical line. In a preferred embodiment the load end of the boom terminates in a workpiece arm which supports a

A workpiece lift including a pivotable boom with a pivot end that moves horizontally as the load end of the boom is raised and lowered, allowing the load end to move along a substantially vertical line. In a preferred embodiment the load end of the boom terminates in a workpiece arm which supports a workpiece and which extends downwardly from the load end of the boom so that the workpiece may be lifted upwardly and outwardly in an arc.

대표청구항 ▼

A lift for raising a workpiece, comprising: a pivotal boom having an extensible load end terminating in an upper reach and a pivot end; means for supporting said boom so that said boom pivot end is horizontally movable but substantially vertically fixed; a support arm having one end held from substa

A lift for raising a workpiece, comprising: a pivotal boom having an extensible load end terminating in an upper reach and a pivot end; means for supporting said boom so that said boom pivot end is horizontally movable but substantially vertically fixed; a support arm having one end held from substantial horizontal motion and pivotally mounted for rotation about a substantially horizontal axis and a second end pivotally mounted to said boom; means for raising and lowering said boom so that as said boom load end is elevated, its boom pivot end responds by moving substantially horizontally toward said support arm; a workpiece arm extending from the load end of said boom; means for supporting the workpiece on said workpiece arm at a location below the upper reach of the load end of said boom; and means for continuously extending said extensible load end as said load end is elevated, whereby said workpiece arm is elevated and lifts the workpiece in an arc such that the workpiece is extended farther horizontally from the lift when in its elevated position than when in its unelevated position.