Communication terminal device and dialing key

Details Communication terminal device and dialing key Communication terminal device and dialing key

1994-02-14

1995-06-27

Kuntz, Curtis

Telephonic communications

Telephone line or system combined with diverse electrical...

To produce visual-graphic copy

379322, 379368, H04M 1100, H04M 100

Patent

active

054286743

ABSTRACT:
A communication terminal device including a first switch provided between a button and an intermediate member, and a second switch provided below the intermediate member such that when the button is depressed, both the first and second switches are surely switched on. Both the switches are electrically insulated from each other. Wiring is made such that one of those switches may operate a telephone circuit connected directly to a telephone line while the other switch may operate a main communication unit operating with a commercial power source. Even when the commercial power source is interrupted due to a power stoppage, at least the telephone circuit is operable, so that the terminal device is capable of fulfilling at least the function of a telephone set and ensuring insulation between the telephone unit and the main communication unit.

REFERENCES:
patent: 4349712 (1982-09-01), Michalski
patent: 4567469 (1986-01-01), Danish et al.
patent: 4771139 (1988-09-01), DeSmet
patent: 4862499 (1989-08-01), Jekot et al.
patent: 4916732 (1990-04-01), Kotani et al.
patent: 5289533 (1994-02-01), Wasio et al.

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