Magnetic door alarm with resettable delay

Communications: electrical – Condition responsive indicating system – Specific condition

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Details

340528, 340636, G08B 1308

Patent

active

054345561

ABSTRACT:
A battery alarm system that is capable of recognizing when a child has opened a door by utilizing self contained electronic circuitry with a switch mounted out of reach of the child. If a child opens the door, the horn sounds. If a taller person opens the door, he can prevent the sounding of the alarm by pressing the switch either before or after the door is opened and then closing the door within a preset time. The preset time period may be extended by pressing the button. If the horn has sounded and the button is pressed, closing the door will shut off the horn. The door can also be opened and closed and the switch pressed all within a preset time without the horn being sounded. These features avoid the horn being unnecessarily sounded. When the battery energy is depleted, the horn emits a chirping sound for several weeks. The electronic circuitry allows for very low power drain and permits the battery to last for over a year under normal operating conditions. The switch, horn, and electronic circuitry are mounted near a door with leads from the electronic circuitry to a magnetic reed mounted on the door jam. The magnet that mounts to the door next to the reed switch activates and deactivates the reed switch.

REFERENCES:
patent: 4004288 (1977-01-01), Webb, Jr.
patent: 4278968 (1981-07-01), Arnett et al.
patent: 4335376 (1982-06-01), Marquardt
patent: 4427975 (1984-01-01), Kinzie
patent: 4920333 (1990-04-01), Barr et al.
patent: 5138299 (1992-08-01), Patten et al.
patent: 5144283 (1992-09-01), Arens et al.

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