Back cover lock for a combination lock

E - Fixed Constructions – 05 – B

Patent

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Details

E05B 37/00 (2006.01) E05B 9/00 (2006.01) E05B 47/00 (2006.01) E05B 49/00 (2006.01)

Patent

CA 2344260

A mechanism for locking the back cover (120) of a combination lock to the lock housing is described having two sequentially and phased moveable parts (20, 66), each having an aperture (100, 110) through which a locking member may be inserted, the apertures (100, 110) are disposed in parts (20, 66) moveable in parallel and adjacent planes and a portion of each aperture (100, 110) is at all times aligned with the other aperture such that a third member (122) may extend through the apertures. The apertures (100, 110) have enlarged portions (104, 114), which will pass the third member (122), and channel portions (102, 112), which prevent withdrawal of the third member (122) while permitting movement of the moveable parts (20, 66). The third member (122) is carried by the back cover (120) of the lock and can only be withdrawn by sequentially withdrawing from a first of the moveable parts (66), shifting the moveable parts to a second position and withdrawing from a second moveable part (20). The back cover (120) may thus be only removed by starting with the bolt (20) in an extended position and locked condition and prior to final withdrawal of the third member (122), withdrawing the lock bolt (20) to an unlocked position, necessitating possession of authorization to unlock the lock in order to remove the back cover (120).

L'invention concerne un mécanisme de verrouillage destiné au couvercle arrière (120) d'un verrou à combinaison contenu dans un boîtier. Ce mécanisme est composé de deux parties mobiles à déplacement séquentiel et en phase (20, 66), chacune possédant une ouverture (100, 110) où vient s'insérer un élément de verrouillage. Ces ouvertures (100, 110) sont disposées par plans parallèles et adjacents dans les parties mobiles (20, 66), une partie de chaque ouverture (100, 110) étant en permanence alignée avec l'autre ouverture de telle manière qu'un troisième élément (122) puisse passer dans les ouvertures. Les ouvertures (100, 110) possèdent des parties élargies (104, 114) laissant passer le troisième élément (122) et des parties canal (102, 112) qui empêchent le retrait du troisième élément (122) tout en permettant le déplacement des parties mobiles (20, 66). Le troisième élément (122), qui est soutenu par le couvercle arrière (120) du verrou, ne peut être retiré qu'une fois les opérations séquentielles suivantes exécutées: retrait d'une première partie mobile (66), déplacement des parties mobiles jusqu'à une seconde position et retrait de la seconde partie mobile (20). Ainsi, le couvercle arrière (120) ne peut être retiré que si le pêne (20) est en position sortie et verrouillée, avant le retrait final du troisième élément (122) entraînant le retrait du pêne (20). L'on ne pourra ouvrir le verrou permettant de retirer le couvercle arrière (120) qu'en possession de la combinaison autorisée.

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