Rungs for individual rung ladders and a fabrication method for such rungs

摘要

A rung (13) for an individual rung ladder, which rung includes a foot support rung member (15) and two separately formed support arm members (16). The ends of the rung member and associated ends of the support arm members having joints therebetween which include lugs (15f) on the ends of the rung member interengaging with lugs (16b) within holes (16a) formed in the associated ends of the support arms. One side of the lugs on the ends of the rung member being tapered and one side of the lugs within the ends the support arms being also tapered to match the taper of the lugs on the ends of the rung member whereby the lugs will interengage to lock the arm members on the rung member in wedge-like fashion. The direction of taper of the interengaging lugs at one end of the rung member being opposite to those at the other end of the rung member, whereby when the support arms are joined to the ends of the rung member, and the support arms are fixed to a support structure, the rung member will not move relative to the support arm members. A method of fabricating a rung for an individual rung ladder is also disclosed, as well as a method of attaching the rung to a support structure.