Curtain door alarm

Details Curtain door alarm Curtain door alarm

1995-08-02

1998-07-07

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

335206, G08B 1308

Patent

active

057775524

ABSTRACT:
A magnetic alarm sensor (80) includes a magnet (84) positioned so that dominant length components (108) of its magnetic field lines (104) are oriented so that they are transverse to a switch axis (96) of a magnetically sensitive switch (88). This orientation permits more versatile mounting options for placement of the alarm sensor, especially to positions that are less prone to displacements over time. A preferred embodiment of the magnetic alarm sensor (110) employs two spatially collinear magnetic switches (116, 118) vertically oriented along a door bracket (14) and a magnet (120) positioned on a door panel (22) such that the magnetic field lines (152) of the magnet are generally perpendicular to the switch axis (136) of the magnetic switches. The magnetic switches are electrically connected in parallel to extend the range of vertical critical distance between the magnet and the magnetic switches to inhibit false alarms caused by door sag.

REFERENCES:
patent: 2877361 (1959-03-01), Chase
patent: 3596021 (1971-07-01), Saul
patent: 3710369 (1973-01-01), Takahashi
patent: 3828340 (1974-08-01), Bauer, Jr. et al.
patent: 4232309 (1980-11-01), Dillitzer
patent: 4271338 (1981-06-01), Rakocy
patent: 5402106 (1995-03-01), DiPaolo et al.
patent: 5422628 (1995-06-01), Rodgers
patent: 5442865 (1995-08-01), Wallrafen

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