Security device

Details Security device Security device

1991-04-08

1993-03-16

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

70271, 70278, H04B 100

Patent

active

051948559

ABSTRACT:
An improved security system comprising a relay selectably operable to pass electrical power to a protected device, a code plug having a preset combination of possible electrical connections controlling passage of electrical current to actuate said relay, a key carried by an authorized person insertable into said code plug to complete preset combination of connections, and a switch box connected in series between said code plug and said relay having a plurality of multiposition switches each having a plurality of contacts selectably connectable by a person seeking to limit access to said protected device in a manner to define a desired combination to which said switches must be set in order to allow said switch box to pass said current to said relay.

REFERENCES:
patent: 1905965 (1933-04-01), Leschke et al.

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