ES139187U - Metal stairs. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Metallic staircase, essentially characterized by consisting of two metal tubes of oval section in most of its length and circular section in a short area of its lower ends, which gives them great rigidity, being joined by other transverse tubes, forming the frame that acts as a support ridge for the ladder, having, in addition, the flattened upper ends, in the form of blades, properly perforated, to join articulatedly to the ends also crushed in the form of a shovel, of two other equal metal tubes, which are joined together by transverse tubes each of which is strung a stamped metal plate, or a wooden board reinforced with metal plates, constituting the rungs, which in turn are joined articulately at both ends, to a pair of tubes or plates, from which split two other articulated tubes that are joined to one of the transversal ones of the trestle, acting as limiters of the opening of the staircase, which also has a handle on the top, so that the movement, opening and closing of the scissors of the stairs, requires the simultaneous articulation of all the steps, placing them horizontal, for use, or vertical in the folded ladder position. (Machine-translation by Google Translate, not legally binding)