| 摘要 |
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.
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