Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1977-01-10
1979-09-11
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340571, 340572, 340546, 340689, 340566, 340 65, 200 6145R, 200 6152, 200 6147, G08B 108, H04Q 700
Patent
active
041677331
ABSTRACT:
A tamper-proof security alarm system comprising basically a radio transmitter unit to be located at equipment which is to be protected, and a radio receiver unit with alarm and control circuits located at a point remote from the transmitter. The transmitter unit comprises a unique, wholly self-contained, small portable sensing and triggering assemblage constructed in a novel manner by which it is completely, 100 percent tamper-proof. The sensing and triggering assemblage employs an ultra-sensitive, gravity-responsive electrical switch connected to energize the transmitter, said switch incorporating a suspension system with reset means whereby the switch can be properly oriented to take care of various angularities of the supporting surface on which the assemblage is placed. The reset means clamps the switch in any of an infinite number of oriented positions. Whenever the unit is moved, however slightly, the switch closes and energizes the transmitter. A unique system of additional switches, including an on-off switch, is so arranged that the transmitter is also unfailingly excited to send out a pulse whenever any effort is made to disable the unit. Shifting of the on-off switch from the "on" to the "off" position momentarily excites the transmitter, and actuation of the reset mechanism likewise effects an excitation of the transmitter. The receiver at the remote point responds to all signals of any duration from the transmitter, by giving an alarm or effecting a control function.
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Krause Edward B.
Seiden William
Caldwell Sr. John W.
Crosland Donnie L.
Lehmann H. Gibner
Lehmann K. Gibner
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