Lock system with improved auxiliary pin tumbler stack

E - Fixed Constructions – 05 – B

Patent

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E05B 11/00 (2006.01)

Patent

CA 2575872

In a pin tumbler-type cylinder lock having an auxiliary tumbler stack, the bottom pin of the auxiliary tumbler stack has a recessed underside for receiving a projection on the key to form a detent. The invention provides an additional functionality that has not previously been associated with the auxiliary tumbler stack. When the projection on the key as seated, it prevents the key from being withdrawn from the keyway while the plug is in any rotational position in which the drive and bottom pins are not substantially aligned. Thus, the key is retained whenever the plug has been rotated.

Sachant que dans une serrure à cylindre du type avec gorges à levier comprenant une pile auxiliaire de gorges à levier, le levier inférieur de la pile comporte une face inférieure avec un renfoncement qui reçoit une protubérance de la clé pour former ainsi un cran, on décrit, aux fins de l'invention, une fonctionnalité additionnelle encore jamais associée à la pile considérée. Désormais, lorsque la protubérance de la clé est en place, la clé ne plus être retirée du passage si le cylindre est dans une position de rotation quelconque pour laquelle le levier d'entraînement et le levier inférieur ne sont pas sensiblement alignés. Dès lors, la clé est retenue chaque fois que le cylindre est mis en rotation.

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