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Priority to ES0083396UpriorityCriticalpatent/ES83396Y/en
Publication of ES83396UpublicationCriticalpatent/ES83396U/en
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Publication of ES83396YpublicationCriticalpatent/ES83396Y/en
New perfected step for ladders, characterized by consisting of a crossbar that, in horizontal position, adopts a rectangular shape, carrying on its lateral sides and in its central part, two projections that have the mission to fit into the lateral vertical crossbars, introducing part of said projection on the rear vertical crosspiece of the staircase; and taking said rung, in the front part and in both sides, other projections, forming between these and the central projections, an inwardly arched entrance, in the form of a semicircle, which is precisely where the vertical lateral crosspiece fits, the union being made and fastening between the rungs and vertical side rails, by means of nailing and pulling, both frontally and laterally, with which the ladder acquires a total consistency. (Machine-translation by Google Translate, not legally binding)
ES0083396U1960-10-071960-10-07
Perfected step for ladders
ExpiredES83396Y
(en)