METAL LADDER

摘要

A metallic ladder includes stiles (or side rails) of U or I section and rungs which are supported at each end by a reinforcing plate. The stiles have, in section on each longitudinal wall a flange which is spaced inwardly with respect to a free edge of the respective longitudinal wall so as to form a ridge. The reinforcing plates rest on the flanges and are restrained laterally by the ridges. The reinforcing plates are held at the flanges by a tab and opening arrangement. Each rung has a shoulder adjacent each end which contacts either the reinforcing plate or the web of the stile and the extreme end portion of the rung engages correspondingly in the web or the plate.