ES286192U - Master key (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Master key, which is applicable to classic double-accessible cylinder locks between whose two halves a cam is provided with two clutch parts capable of selectively engaging, through a radial lug, one of two cutouts operatively practiced in a perimeter partition internal cam and in diametrical opposition, so that said pair of cams is displaced longitudinally by the introduction of a key also conventional resulting operable cam next to said key and inoperative the opposite cam, and intended to allow the opening of the lock when a conventional key is engaged in it and slightly rotated, blocking the pair of clutch parts, is essentially characterized by, from an arm carrying reliefs coinciding with those of a normal beech and determined by the actual structuring of the light bulb, presents a slight shortening in the length of dich or arm, so that said key is able to fully penetrate the bulb, up to a limit situation in which it approaches the clutch parts, but without affecting the latter, whatever their position, having provided that said key incorporates a retractable stem, against the tension of a spring, arranged eccentrically and in a confronting situation, in a certain position of the key, to one of the slots or necklines of the cam, specifically to that not occupied by the lugs of the cam. The clutch parts, all in such a way that when the said key is inserted and the stem impinges on the clutch parts, it retracts allowing the total penetration of the key and, when properly rotating the latter and facing the aforementioned slot, it projects axially, staying in it and establishing the link between key and cam, which allows the latter to actuate. (Machine-translation by Google Translate, not legally binding)