Gerhard M Schmidt

US Patent:

40755886, Feb 21, 1978

Filed:

Nov 5, 1975

Appl. No.:

5/628849

Inventors:

Nathan Verger - Great Neck NY
Gerhard Schmidt - Rego Park NY

Assignee:

Alarm Device Manufacturing, Co. - Syossett NY

International Classification:

H01H 3600

US Classification:

335207

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.

US Patent:

39407250, Feb 24, 1976

Filed:

Jan 24, 1975

Appl. No.:

5/543672

Inventors:

Nathan Verger - Great Neck NY
Gerhard Schmidt - Rego Park NY

Assignee:

Alarm Device Manufacturing Co. - Syosset, L.I. NY

International Classification:

H01H 3600

US Classification:

335207

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.