Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-12-17
1992-04-07
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
160 10, 340652, G08B 1302, G08B 1313, G08B 1322
Patent
active
051032082
ABSTRACT:
An expandable entry detection screen is for use with an electronic alarm system. The expandable entry detection screen includes a first screen frame and a second screen frame for fitting into an opening of a window frame. The second screen frame is adjustably and slidably coupled to the first screen frame. The expandable entry detection screen also includes a first screen mesh and a second screen mesh which are mechanically coupled to the first and second screen frames, respectively. A first portion of a single wire is mechanically coupled to the first and second screen meshes and disposed in the first frame. A second portion of the single wire has slack and is disposed in the second frame. The single wire is electrically coupled to the electronic alarm system. A take-up mechanism takes-up the slack in the second portion of the single wire. The take-up mechanism includes a mounting bolt and nut assembly, a spring and a hook. The mounting bolt and nut assembly is mechanically coupled to the second frame. The spring is mechanically coupled to the mounting bolt and nut assembly. The hook is mechanically coupled to the spring and to the second portion of the single wire so that the single wire remains taut in order to avoid detection by an intruder.
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Johansen W. Edward
Swann III Glen R.
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