ES160970U - Perfected hand ladder. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Improved hand ladder, of the type comprising two elementary ladders, articulated with each other through an ideal upper transverse axis, forming a compass that can be opened up to a certain limit position, characterized in that the indicated elementary stairs have appropriate widths to be able to fit a inside another, involving the staircase of greater width, conveniently fitted and joined to the upper extremity of its stringers, symmetrical opposing plates, each of which has a protruding orthogonal partition, which describes an obtuse angle, with its area upper approximately parallel to the axis of the spar, and its lower branch forming with this axis an angle equivalent to that which the two ladders must form in the position of use, and a flange describing an approximately right angle, presenting its upper zone approximately parallel to the upper part of the partition and joined to the lower one through s of a verticeredondeado, while the staircase of smaller width involves joined to the upper extremities of their stringers, symmetrical plates, from which emerge aligned opposite pivots, arranged to define the ideal axis of articulation between both stairs; all in such a way that once the shorter staircase is folded over the widest one, it is possible to slide it in the axial direction, guided by the referred partitions, against which the corresponding stringers rest on one of their edges, and flanges also referred to, against which the said pivots rest, until they leave those, allowing the separation between the two ladders, and so that it is enough to invert this movement until the pivots rest against the rounded corners of the flanges, for that the two stairs are conveniently coupled and articulated. (Machine-translation by Google Translate, not legally binding)