Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-06-09
1996-06-25
Metjahic, Safet
Communications: electrical
Condition responsive indicating system
Specific condition
340545, 335205, 200 617, G08B 1308, H01H 900, H01H 316
Patent
active
055304281
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. The respective switch assemblies (10, 46, 56, 84, 124, and 144) are capable defeating attempted external magnetic manipulation as ball 34 traverses transversely oriented elongated paths of travel (P1 and P2, P3 and P4, or P5, P6 and P7) responsive to external magnetic forces.
REFERENCES:
patent: 1051962 (1913-02-01), Lundquist
patent: 1192893 (1916-08-01), Harvey
patent: 1868923 (1932-07-01), Semon
patent: 3516036 (1970-06-01), Lea
patent: 3535664 (1970-10-01), Staar
patent: 3630168 (1971-12-01), Fladlay
patent: 3650347 (1972-03-01), Campos
patent: 3763484 (1973-10-01), Byers
patent: 3816680 (1974-06-01), Suzuki et al.
patent: 3842377 (1974-10-01), Barndt
patent: 4042796 (1977-08-01), Zink
patent: 4057773 (1977-11-01), Cohen
patent: 4062314 (1977-12-01), Allen et al.
patent: 4168410 (1979-09-01), Norris
patent: 4275391 (1981-06-01), Okamura
patent: 4293860 (1981-10-01), Iwata
patent: 4326196 (1982-04-01), Plevy
patent: 4336518 (1982-06-01), Holce et al.
patent: 4450326 (1984-05-01), Ledger
patent: 4456897 (1984-06-01), Holce et al.
patent: 4553134 (1985-11-01), Holt
patent: 4567846 (1986-02-01), Kurtz
patent: 4628160 (1986-12-01), Canevari
patent: 4656458 (1987-04-01), Iwata
patent: 4733324 (1988-03-01), George
patent: 4788517 (1988-11-01), Meister
patent: 4982058 (1991-01-01), Schroeder et al.
patent: 5192839 (1993-03-01), Imade et al.
patent: 5248861 (1993-09-01), Kato et al.
patent: 5248959 (1993-09-01), Chern
patent: 5332992 (1994-07-01), Woods
Metjahic Safet
Miller John W.
LandOfFree
Security alarm switch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Security alarm switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Security alarm switch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2192496