Electronic identifying security system

Details Electronic identifying security system Electronic identifying security system

G - Physics

08

B

340/128

G08B 13/22 (2006.01) G07C 9/00 (2006.01)

Patent

CA 1040284

ELECTRONIC IDENTIFYING SECURITY SYSTEM Abstract of the Disclosure: An electronic identifying security system for use with one or more locks can be actuated only by valid keys that have a pattern of internal electrical conductors capable of applying an authorized permutation of binary signals to a plurality of input conductors of the security apparatus. The security apparatus has a lock opening mechanism and an alarm device. The alarm device is actuated either by application of a binary "one" signal to an input conductor for which a binary "zero" is proper, or else by a binary "one" on at least one but fewer than all of the input conductors for which a binary "one" is proper. In addition to the foregoing internal conductors, additional internal conductors are permuted to identify the keys in groups and individually. Lost keys can be prevented from working without changing the general combination by reprogramming the apparatus to specifically exclude them. A portion of the system is switchable from a mode of operation in which it excludes individual keys to a mode of operation in which it excludes groups of keys. In a security system that has a plurality of door locks, groups of keys can be made capable of unlocking some doors but not others.

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