Electricity: circuit makers and breakers – Switch activation inhibitor – Combined with connector coupling
Patent
1977-09-12
1978-08-15
Hall, George T.
Electricity: circuit makers and breakers
Switch activation inhibitor
Combined with connector coupling
70278, H01H 2710
Patent
active
041074858
ABSTRACT:
As a requirement for the opening of a lock or similar security device, an operative group of partially series-interconnected switches is required to be completely series-interconnected, i.e. placed in a closed circuit relation. However, in contrast to a typical prior art electric lock, in which the few switches which operate the lock are grouped, in order to obviate unauthorized detection, with "decoy" switches, the within invention uses all switches in the lock-opening circuit, in that some switches are required to be actuated and the remainder not actuated, or otherwise the circuit cannot be completed. Thus, the security of the lock is significantly improved since unauthorized opening thereof requires not just determining the proper switches to actuate, but also the proper switches which should not be actuated.
REFERENCES:
patent: 1449248 (1923-03-01), Rathlun
patent: 2021925 (1935-11-01), Schweiso
patent: 2819770 (1958-01-01), Gibbs
patent: 3518383 (1970-06-01), Purpura
patent: 3722238 (1973-03-01), Ring
patent: 3969596 (1976-07-01), Siegel
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