Sectioned sliding ladder drop-hook - as lever with arm on rung below and arm on lower ladder rung

摘要

The drop hook is of the type used on a sliding ladder, the length of which is adjustable by moving lengthways at least one upper ladder component led along the component below, using a cable-pull locking and release is effected by drop-hook fastened to one of the components, with its activating elements engaging rungs, or other elements, on the other component. The drop-hook (25) on a swivelling mounting on the inside of a stringer of the upper component (1), is in the form of a two-armed lever. One of its arms (13) has its support surface fitting on the rung below (8), on the upper component, when in the catch position, to prevent the hook from twisting the selected rung (5) of the lower component (6) with a load-transfer effect across the lever's axis (24).