Digital combination lock and means for remotely presetting combi

Details Digital combination lock and means for remotely presetting combi Digital combination lock and means for remotely presetting combi

1977-01-31

1978-06-13

Pitts, Harold I.

Communications: electrical

Digital comparator systems

340164R, 340274C, 340149R, H04Q 302, H04Q 300

Patent

active

040952398

ABSTRACT:
A digital combination locking system having a plurality of push buttons, each push button allocated to a different numerical digit. The push buttons are connected to selector switches for presetting any desired combination of digits. A plurality of semiconductor switches powered by direct current are serially connected, the last one of the series being connected to an electrical self latching locking mechanism for unlocking the lock upon selection, by operation of the push buttons, of the proper preset combination of digits. An alarm logic circuit is also provided so as to detect when two or more push buttons have been improperly operated or operated out of their proper sequence to set off an alarm that can only be shut off upon properly selecting the preset digit combination. Means are also provided for remotely enabling the presetting or clearing of the combinations of any of a plurality of such digital locking systems.

REFERENCES:
patent: 3731156 (1973-05-01), Watson

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