Door chime

Communications: electrical – Condition responsive indicating system – Specific condition

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Details

340384E, 340527, 340693, G08B 1308

Patent

active

048334545

ABSTRACT:
An audio signal device for a door mounted advertising display, the device includes a signal unit, a battery connected to said signal unit, the unit including a tone generator, a pulse generator connected to control the tone generator, a timer connected to control the time of operation of the pulse generator, and a motion switch connected to energize the timer in response to the motion of the door, the timer further including a circuit for preventing reactivation of the timer for a predetermined period of time.

REFERENCES:
patent: 4258358 (1981-05-01), Lee et al.
patent: 4435701 (1984-03-01), Baon
patent: 4772879 (1988-09-01), Hein

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