Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1991-04-15
1992-11-17
Ng, Jin F.
Communications: electrical
Condition responsive indicating system
Specific condition
49 13, 200 6172, G08B 1308, H01H 316
Patent
active
051647052
ABSTRACT:
An anti-intrusion window is disclosed comprising a window frame assembly adapted to be attached to a building structure, first and second sash assemblies supported by the frame assembly and relatively movable with respect to each other, a position indicator supported by one sash, a sensor supported by the other sash and an alarm signal generator activated whenever the position indicator and the sensor are at least momentarily adjacent each other. Multiple windows are coupled to a second alarm signal generator which produces an audible alarm when the first alarm signal generator transmits an alarm signal. The sashes may be moved into cleaning positions without triggering an alarm.
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Bernath Stanley
Dunagan John E.
Larmco Security, Inc.
Mullen Jr. Thomas J.
Ng Jin F.
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