Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1980-11-13
1982-07-13
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
200 6148, 200 6152, 200 6193, 335207, 340546, G08B 1308
Patent
active
043397476
ABSTRACT:
There is provided an alarm, which includes a mounting base, and means for securing the mounting base to an item whose movement is to be signalled by the alarm. A magnetic reed switch constitutes a first element, and a magnet constitutes a second element. One of these elements is mounted on a pivotal member capable of pivoting with respect to the mounting base, while the other of the elements is capable of retaining a given position with respect to the mounting base. The relative distance from the pivot location for the pivotal member to the location of said other of said elements can be adjusted between a separated position in which the reed switch is unaffected by the magnet regardless of pivotal movement of the pivotal member, and a juxtaposed position in which the reed switch is (a) unaffected by the magnet when the pivotal member hangs initially in an equilibrium position, (b) closed by the magnet when the pivotal member swings through a given displacement from the equilibrium position, and (c) remains closed after the pivotal member swings back to the equilibrium position. An electrically-powered signal-creating device is provided, and an electrical circuit by which power from a power source is supplied by way of the reed switch to the signal-creating device.
REFERENCES:
patent: 3364318 (1968-01-01), Bulliet
patent: 3548400 (1970-12-01), Boyd et al.
patent: 3725892 (1973-04-01), Faltico
patent: 3786469 (1974-01-01), Massaro et al.
patent: 4100539 (1978-07-01), Stahl et al.
patent: 4227188 (1980-10-01), Peterson
patent: 4275391 (1981-06-01), Okamura
patent: 4282518 (1981-08-01), Bonner
Caldwell Sr. John W.
Nowicki Joseph E.
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