Importance

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Abstract

A locking and unlocking device particularly employable for a double lock system such as a bank lock and a client lock is disclosed. To operate the bank lock, a magnetic card specifically allocated to a client is inserted into a casing or cover through a card insert hole until a plurality of magnetized points on the magnetic card are located in alignment with the corresponding permanent magnet pins, which are held in engagement holes on a sliding member or lever. Polarities and coordinate positions of the magnetized points on the magnetic card are previously determined by means of an encoder. The permanent magnet pins are brought in disengagement from the engagement holes under the influence of magnetic repulsive or attractive force developed between the permanent magnet pins and the magnetized points on the magnetic card when the latter is inserted through the card insert hole. After the sliding member or lever is free from the permanent magnet pins, it is displaced in such a direction that a window formed on the bottom of the casing or the base member becomes exposed to the outside and thereafter the client inserts his key through the window to open the client lock. The cover is slidably fitted to the base member, and after the magnetic card is inserted, it is displaced in the opposite direction to that of insertion of the magnetic card. Safe room entering and leaving readers are preferably fitted to an automatic door for the rental safe room.

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First Claim