Circuit arrangement for the electronic code locking of locks

A lock, comprising:

• a supply voltage;
• a manually operable key which includes an electrical switch adapted to be manually operated selectively to open or close an electrical circuit;
• each operation of said switch producing an input signal;
• a means for storing a reference code;
• a locking signal generator adapted to be triggered to generate a locking signal;
• an unlocking signal generator adapted to be triggered to generate an unlocking signal;
• an electronic means for classifying temporal intervals between successive ones of said input signals produced by actuations of said key into a plurality of groupings;
• a comparator;
• said comparator being adapted to generate a signal to selectively trigger an unlocking signal or a locking signal;
• said electronic means for classifying supplying said classified input signals to said comparator;
• said comparator being adapted to compare said stored reference code to said classified input signals;
• said comparator triggering said unlocking signal when said stored reference code is identical to said classified input signals;
• a latch adapted to be selectively moved to an open condition or a closed condition;
• a means for operating said latch selectively to an open condition or a closed position;
• said means for operating being actuated selectively by said unlocking signal or said locking signal in an opening operation or a closing operation, respectively;
• whereby when entry of input signals by operation of said key matches said stored reference code, said latch is triggered by an unlocking signal from said comparator to be operated to an open condition by said means for operating.