Electricity: magnetically operated switches – magnets – and electr – Permanent magnet-actuated switches – Plural magnets
Patent
1975-11-05
1978-02-21
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Permanent magnet-actuated switches
Plural magnets
H01H 3600
Patent
active
040755886
ABSTRACT:
An apparatus for switching an alarm-signalling device connectable to a protective circuit so as to signal an alarm when a door or the like is displaced from its closed position in a jamb or the like by an intruder, in which the switching apparatus is mounted in the door and jamb or the like. The switching apparatus includes a switch connectable to the protective circuit, mounted in a housing installable so as to be recessed in the jamb, and a metal plate installable so as to be recessed in the side of the door and disposed opposite the switch when the door is closed in the jamb. The switch includes a pair of contacts disposed in one end of the housing, a magnet reciprocally movable in the other end of the housing, and magnetized such that opposite faces thereof define poles of opposite polarity, a hollow metal plate mounted in the housing intermediate the pair of contacts and the magnet, and a connector extending through the hollow metal plate and connecting the magnet to one of the contacts for movement therewith. When the metal plate is positioned opposite the housing, upon closing the door or the like in the jamb or the like, the magnet is attracted towards the metal plate and moves the contact connected thereto so as to compress the contacts in a rolling and wiping action to close the protective circuit. When the door and metal plate mounted therein are displaced from their closed position in the jamb, the magnet is attracted to the hollow metal plate and moves the contact connected thereto so as to open the protective circuit which actuates the alarm-signalling device.
REFERENCES:
patent: 3539741 (1970-11-01), Voland
patent: 3691490 (1972-09-01), Ragni
patent: 3940725 (1976-02-01), Verger et al.
Schmidt Gerhard
Verger Nathan
Alarm Device Manufacturing Co.
Broome Harold
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