Telephone

Details Telephone Telephone

1990-06-12

1991-05-07

Schreyer, Stafford D.

Telephonic communications

Multi-line or key substation system with selective switching...

Switching or supervision feature

379423, H04M 172

Patent

active

050143026

ABSTRACT:
The invention relates to telephones that have a base and two handsets or one handset and a base acting as a second handset and which are adapted to be connected to two or more telephone lines. Unlike known telephones designed to be connected to a set number of lines and to no other, the telephone according to the invention comprises an adapter that enables it to be connected equally well to a single line as to two lines or more, depending on the maximum number of lines for which it has been designed, and to provide in each case the same scope for communication between parties as a known telephone connected to the same number of lines. The adapter preferably includes change-over switches that can be operated by acting on a control device that is accessible from outside the telephone, but it may also include change-over switches or wire connections located inside the telephone.

REFERENCES:
patent: 4107477 (1978-08-01), Morrison
patent: 4536621 (1985-08-01), Bergen et al.
patent: 4817138 (1989-03-01), Thomke et al.
French Search Report in Corresponding French Application.

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