Visitor sensing device

Details Visitor sensing device Visitor sensing device

1992-03-09

1994-01-18

Swarthout, Brent

Communications: electrical

Systems

In and out indicators

340541, 358 85, 358108, G08B 300

Patent

active

052802663

ABSTRACT:
A visitor sensing device capable of being combined with a conventional door intercom is provided. The device includes a detecting circuit to be installed adjacent a door of a house, for sensing the presence of a visitor standing in front of the door for a preset period of time. Responsive to detecting a visitor, the detecting circuit sends a signal to a converting circuit. The converting circuit converts the signal received from the detecting circuit into a monostable pulse to be fed to a vision circuit, which then displays an image of a visitor on its screen and also actuates an audio circuit. The audio circuit includes a buzzer to generate an audio signal.

REFERENCES:
patent: 3482037 (1969-12-01), Brown
patent: 4023151 (1977-05-01), Markham
patent: 4232196 (1980-11-01), Filippi
patent: 4370675 (1983-01-01), Cohn
patent: 4764755 (1988-08-01), Pedtke et al.
patent: 4843461 (1989-06-01), Tatsumi et al.
patent: 5155474 (1992-10-01), Park et al.

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