ES447707A1 - Improvements introduced in flexible ladders. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Improvements introduced in flexible stairs, comprising two articulated uprights that carry the steps, characterized in that each upright (1,2) is composed of joints that follow each other longitudinally to the upright and that form a nuremberg-type scissors, the joints being formed by pieces carriers (4) each secured to one end of step (3) and intermediate pieces (5) each of the joints being arranged outside the preceding one in relation to the steps from top to bottom of the staircase, comprising the pieces carriers and the intermediate pieces each a central pivot (6) and two end pivots (7), presenting a dimension, in the defined direction, by the pivots, superior to its dimension in a perpendicular direction, articulating each piece of a class on a piece of another kind by the central pivots (6) and on two pieces of another kind by the end pivots (7), being t the joints that when folded or unfold the ladder, the intermediate pieces (5) pivot relative to the carrier pieces (4) on the central pivots (6) so that in the deployed position of the ladder the supporting parts and by consequently the steps are separated at the maximum longitudinally with respect to the upright, and that in folded form of the staircase the carrier pieces and the steps are approximated to the maximum, the shape of the carrier pieces and of the intermediate pieces being such that in the folded position these pieces are aligned one above the other so that the upright has a width equal to the small dimension of these pieces. (Machine-translation by Google Translate, not legally binding)