Electricity: magnetically operated switches – magnets – and electr – Permanent magnet-actuated switches – Plural magnets
Patent
1975-01-24
1976-02-24
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Permanent magnet-actuated switches
Plural magnets
H01H 3600
Patent
active
039407250
ABSTRACT:
An apparatus for switching an alarm-signalling device which is 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 which is connectable to the protective circuit, which is mounted in a housing which is installable so as to be recessed in the jamb, and a magnet which is magnetized such that opposite faces thereof define poles of opposite polarity, which is mounted in a housing which is 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 metal plate mounted in the other end of the housing, and a magnet which is reciprocally movable in the housing, which is magnetized such that opposite faces thereof define poles of opposite polarity, and which is disposed so that one pole thereof faces the metal plate, which pole is of the same polarity as the pole of the external magnet which is disposed opposite the portion of the housing in which the metal plate is mounted when the external magnet is positioned opposite the housing, so that the switch magnet is repelled by the external magnet when the external magnet is so positioned such that the switch magnet bears against the contacts to compress the contacts in a rolling and wiping action to close the protective circuit; when the door and external magnet are displaced from their closed position in the jamb, the switch magnet is attracted to the metal plate such that the contacts are released to open the protective circuit which actuates the alarm-signalling device.
REFERENCES:
patent: 3689716 (1972-09-01), Csurgay
patent: 3852692 (1974-12-01), Moorman
Schmidt Gerhard
Verger Nathan
Alarm Device Manufacturing Co.
Broome Harold
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