Scaffold structure

Claim 1

A scaffold structure comprising: a ladder assembly having a pair of juxtaposed and spaced-apart elongated support members, a plurality of rungs interconnecting said support members at a plurality of longitudinally spaced-apart locations, and means connected to said support members for maintaining said ladder assembly in a substantially vertical orientation during use so that said support members extend in a generally vertical direction comprising two arms extending outwardly from said support members and lying in a plane generally perpendicular to that of said support members, means mounting said arms on said support members for sliding movement along substantially the whole length of said support members comprising a first pair of connecting members each disposed about and slidable along the outboard side of respective ones of said support members and connected to one of said arms and means including a connecting rod interconnecting both connecting members, and manually actuatable means for effecting movement of said arms along the length of said support members; and a vertically positionable platform assembly movably connected to said ladder assembly for vertical movement therealong and defining therewith a scaffold structure, said platform assembly comprising a base portion extending outwardly from said support members in the same direction as said arms and dimensioned to accommodate thereon a standing person when said ladder assembly is vertically orientated, means movably connecting said platform asembly to said ladder assembly for movement therealong, locking means connected to said platform assembly and coacting with said rungs for releasably locking said platform assembly in a predetermined working position along said ladder assembly and comprising a pair of pivotally mounted locking members having at one end substantially flat end faces and means mounting said locking members for manual pivotal movement to a locking position wherein said flat end faces rest upon and bear against a common one of said rungs to thereby releasably lock said platform assembly in said working position and to an unlocking position wherein said flat end faces are free of said rungs to thereby permit movement of said platform assembly along said support members, and means engageable with a person ascending or descending said ladder assembly for effecting corresponding vertical ascending or descending movement of said platform assembly along said support members; whereby said platform assembly may be vertically moved and positioned along said ladder assembly by the ascending or descending movement of a person along said ladder assembly.