Common bell ringing apparatus for multiple button key telephone

Details Common bell ringing apparatus for multiple button key telephone Common bell ringing apparatus for multiple button key telephone

1977-06-29

1978-12-26

Claffy, Kathleen H.

H04M 126

Patent

active

041317700

ABSTRACT:
A common telephone bell ringing device has a plurality of input terminals adapted to be connected to the ringing sides of a plurality of incoming telephone lines, an output terminal adapted to be connected to a telephone bell, a common terminal for said output and input terminals, a plurality of photoresistors connected between said output terminal and said input terminals, respectively, each being essentially non-conductive when not exposed to radiant energy and conductive when radiant energy impinges thereon, and a plurality of radiant energy sources such as neon lamps connected between said common terminal and said input terminals respectively, each neon lamp being mounted in a light tight enclosure with a corresponding photoresistor so that ringing current on one of said input terminals energizes a corresponding neon lamp to reduce the resistance of a corresponding photoresistor and permit the ringing current to pass to the bell without feedback to any other input terminal.

REFERENCES:
patent: 3406262 (1968-10-01), Grandstaff
patent: 3469036 (1969-09-01), Meri
patent: 3566044 (1971-02-01), Cross
patent: 3875348 (1975-04-01), Kopec

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