Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-12-10
1981-09-29
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
200 6169, 200 6172, 200 6193, 335205, 340545, G08B 1308
Patent
active
042926297
ABSTRACT:
An alarm system signals an attempt at intrusion through an opening framed to receive first and second panel members movable between opening and closing positions, as specifically shown in the form of a sliding glass door and screen door combination. An electrical switch mounted upon one panel has an element responsive to a magnetic field for developing a signal. A magnet mounted upon the other panel is productive of a magnetic field that interacts with the element of the switch upon movement of both the first and second panels to their closed positions. A signaling device coupled to the switch yields an alarm indication upon the beginning of the movement of either one of the panel members away from its closed position.
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Bowie Bruce H.
Kerr Ronald R.
Mullins Keith M.
Caldwell Sr. John W.
Drake Hugh H.
Nowicki Joseph E.
Teledyne Industries Inc.
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