Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-04-06
1994-07-26
Groody, James J.
Communications: electrical
Condition responsive indicating system
Specific condition
340545, 335205, 200 617, G08B 1308, H01H 900, H01H 316
Patent
active
053329929
ABSTRACT:
A magnetic switch assembly (10) is provided for detecting relative movement between first and second adjacent members (14, 18), and to defeat attempted magnetic manipulation of the assembly (10). The assembly (10) includes a pair of adjacent, superposed, upper and lower switch elements (22, 24) adapted for mounting on the first member (14), with the lower switch element (24) presenting a sloped surface (26). A shiftable, ferromagnetic ball (34) is disposed between the elements (22, 24) and movable along surface (26) between spaced upper and lower switch operating positions. A magnet (36) adapted for mounting on the second member (18) is also provided, and is oriented for normally retaining the ball (34) in the upper position thereof; however, upon movement of the member (18), the ball (34) is permitted to shift downwardly along the sloped surface (26) to the lower switch operating position thereof. Attempted magnetic manipulation via external magnet (48) also causes the ball (34) to shift from the upper to the lower position thereof.
REFERENCES:
patent: 3535664 (1970-10-01), Staar
patent: 3630168 (1971-12-01), Fladlay
patent: 3650347 (1972-03-01), Campos
patent: 3842377 (1974-10-01), Barndt
patent: 4042796 (1977-08-01), Zink
patent: 4168410 (1979-09-01), Norris
patent: 4275391 (1981-06-01), Okamura
patent: 4326196 (1982-04-01), Plevy
patent: 4450326 (1984-05-01), Ledger
Groody James J.
Miller John W.
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