Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-09-11
1981-07-28
Yusko, Donald J.
Communications: electrical
Condition responsive indicating system
Specific condition
340547, 340550, 109 41, 200 6184, 339 74R, G08B 1308, G08B 1312
Patent
active
042813204
ABSTRACT:
A protective barrier and burglar alarm in the form of a window blind includes a plurality of slats which may be compacted to open the blind, the slats being supported by flexible cords including electrical conductors establishing an electrically-conductive pathway through the length of the window blind. The lower end of the blind carries retaining means for retaining the blind in its closed position, and circuit-interrupting means effective when the blind is raised or severed to actuate an alarm. In one described embodiment, the retaining means and circuit interrupting means include mating pins and sockets; and in a second described embodiment, they include magnetic retainer elements adapted to actuate a magnetic reed switch carried at the lower end of the blind.
REFERENCES:
patent: 934108 (1909-09-01), Trautmann
patent: 2293609 (1942-08-01), Livingston
patent: 2724824 (1955-11-01), Toepfer
patent: 3552473 (1971-01-01), Persson
patent: 3668582 (1972-06-01), Lea
patent: 3676831 (1972-07-01), Bergwall
patent: 3696373 (1972-10-01), Dunn et al.
patent: 3725891 (1973-04-01), Miller
patent: 4160972 (1979-07-01), La Mell et al.
Crosland Donnie L.
Yusko Donald J.
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