Switch lock installation

Claim 1

A switch lock installation comprising: a lock having mechanical tumblers for locking the lock in a predetermined position and providing a first key secret information, a key for mechanically unlocking the mechanical tumblers and manually moving the lock in a closure direction and in an opening direction, said key having an elongated shank and comprising on its shank, insertable into the lock, an information carrier including at least one element arranged in the carrier and forming a second key secret information, a reading device provided on the lock for reading the at least one element forming the second key secret information from the information carrier, a memory circuit for storing ideal information data of the second key secret information, a control circuit for generating a control signal in dependence upon the ideal information data stored in the memory circuit and the information read by the reading device and having a switch actuable by means of the lock and coupled with the lock, the improvement being that the information carrier comprises, for variation according to choice of the second key secret information, the at least one information carrier element which is variable positionable in relation to the shank of the key , and that the switch is actuatable on movement of the lock in the closure direction and activates the memory circuit for the writing in of the information read by the reading device as ideal information data of the second key secret information, the lock is formed as a cylinder lock and the key is formed as a flat key with a handle piece and a longitudinally extending shank protruding therefrom in the direction of a plane of the handle piece and provided with at least one or recesses and protuberances for the actuation of the tumblers of the lock, and wherein said information carrier is arranged in a region of the transition from the shank to the handle piece, the information carrier comprises at least one disc extending substantially in the direction of the plane of the handle piece, said disc being mounted on the key rotatably about an axis extending transversely of the plane of the disc and carrying at least one permanent magnet as said at least one information carrier element, and wherien the reading device comprises a plurality of magnetic field sensors for the generation of a signal representative of the position of the disc in relation to the key.