초록 ▼

A stage or other structure having support legs includes rollers which are mounted so as to be supporting the stage in a first position and having the stage legs support the stage in a second position. A lift mechanism includes actuating pedals near the ground for raising and lowering the assembly. A

A stage or other structure having support legs includes rollers which are mounted so as to be supporting the stage in a first position and having the stage legs support the stage in a second position. A lift mechanism includes actuating pedals near the ground for raising and lowering the assembly. A linkage pivots the roller mounting member between a raised and lowered position relative to a cross member on the frame. A second pedal is selectively engageable by a single foot for retaining the roller assembly in either the raised or lowered positions.

대표청구항 ▼

A lift apparatus having a first member elevationally adjustable relative to a second member, comprising: (a) one or more pivoting links connecting the first and second members, each of the pivoting links including a lower cross member pivotally connecting the second member to the pivoting link, and

A lift apparatus having a first member elevationally adjustable relative to a second member, comprising: (a) one or more pivoting links connecting the first and second members, each of the pivoting links including a lower cross member pivotally connecting the second member to the pivoting link, and an upper cross member pivotally connecting the first member to the pivoting link; (b) a first actuating member directly attached to a first one of the pivoting links, the first actuating member including a portion pivoting about the lower cross member; and, (c) a second actuating member connected to a stop device moveable between first and second positions, wherein in the first position the stop device engages the second member and the first pivoting link, and in the second position the stop device disengages one of the second member or the first pivoting link for selectively limiting relative motion between the first and second members.