Door bell installation for block of flats - indicates whether button pressed at main door or door to flat using different acoustic or optical signals

Abstract

The door bell installation has a bell circuit supplied with a small alternating voltage and at least one bell which is activated by two bell-pushes located at different positions and giving two different sound signals, so that the positions of the bell-push can be recognised. A diode in series with the electrical contact of one of the two bell-pushes controls the emission of different signals depending on the difference in voltage supplied to it from the bell-pushes. USE/ADVANTAGE - Improved security, simple assembly.

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Patent Citations (1)

    Publication numberPublication dateAssigneeTitle
    DE-8907819-U1September 28, 1989Iligkeit, Joerg, 4300 Essen, De

NO-Patent Citations (1)

    Title
    N.N.: Türklingel für Gehörbehinderte. In: Funkschau, 1977, H. 4, S. 179

Cited By (3)

    Publication numberPublication dateAssigneeTitle
    DE-19713614-A1November 26, 1998Ulrich KarthaeuserHouse or flat door bell
    DE-19731582-A1January 28, 1999Michael BeckerMotorgetriebenes Signalgerät zur Klangerzeugung mit integrierter optischer Anzeige
    DE-19731582-B4September 07, 2006Michael BeckerMotorgetriebenes Signalgerät zur Klangerzeugung mit integrierter optischer Anzeige