Electric locking and unlocking apparatus

Claim 1

An electric locking and unlocking apparatus comprising an electrically controlled lock mechanism, a device for simultaneously reading from a magnetic card a key-code signal consisting of a plurality of bits and a clock signal consisting of the same number of bits and synchronized with said key-code signal, said reading device presenting the respective signals to separate output terminals, a storage device comprising a plurality of storage circuits corresponding in number to a plurality of kinds of keys to be used and respectively storing a predetermined key-comparison signal corresponding to each of said keys and having the same number of bits as the key-code and clock signals, said storage device presenting said key-comparison signal to an output in accordance with said clock signal from said reading device, a logic operational device including a plurality of comparator circuits corresponding in number to said kinds of keys and respectively connected to each of said storage circuits, said logic operational device comparing the respective bits of the key-comparison signals, stored respectively in each of the storage circuits and supplied to each of said comparator circuits upon receiving each bit of the clock signal from the reading device, with the respective bits of the key-code signal from the reading device and producing a coincidence signal at an output when the key-code signal coincides with the key-comparison signal in any one of the storage circuits, and a control device for controlling said lock mechanism in response to said coincidence signal.