Patent ID: 7828116

Claim:
Apparatus comprising: a base carried on ground wheels for movement over a ground surface to an elevated structure on which one or more persons is intended to work; a ladder upstanding from the base to an elevated position above the base; the upstanding ladder being adjustable in height relative to the base; the upstanding ladder including two side rails and transverse rungs such that said one or more persons can climb the ladder to the elevated structure; at least one of the side rails of the ladder having mounted thereon a tubular receptacle; a post member mounted in the tubular receptacle and shaped and arranged so as to extend upwardly from the receptacle, wherein the tubular receptacle is vertical and the post member includes a vertical post portion and an arm extending from the post portion; a deformable link between the post portion and the arm, the deformable link comprising a longitudinal member having opposite ends spaced apart by a first distance along a longitudinal axis, said deformable link comprising at least one slot transverse to the longitudinal axis, said deformable link extending between a first connection point on the post portion and a second connection point on the arm thereby supporting the atm on the post portion, the deformable link being adapted to bend if the load exceeds the load limit of the apparatus thereby visually indicating overloading of the apparatus, the arm being arranged to move during bending of the deformable link such that the distance between the ends of the deformable link is decreased; and at least one support member at an end of the arm remote from the tubular receptacle for attachment to and loading from a personal fall arrest system for attachment to said one or more persons.