Control circuit for pay telephones and the like

Details Control circuit for pay telephones and the like Control circuit for pay telephones and the like

1977-02-07

1978-08-08

Claffy, Kathleen H.

Check-actuated control mechanisms

Including noncontacting, relatively movable parts connected...

194 44, H04M 1702

Patent

active

041058674

ABSTRACT:
A control circuit for a pay phone including a coin unit where money is deposited and validated, an entry circuit having a first input connected to the coin unit for entry of amounts deposited, a second input to the entry circuit for communicating thereto call price information, a control element operable in response to deposits of an amount at least equal to the call price for enabling the customer to dial his call and to enable phone communication with the dialed phone, and apparatus to control payback of excess amounts deposited. The control circuit is preferably powered by a rechargeable energy source that may optionally be connected to the telephone line to derive charging current therefrom to maintain the charge on the energy source. The present control circuit may employ optical or other forms of couplers to establish connections to communicate the dialing mechanism and telephone handset with its associated transmission controls to the telephone line.

REFERENCES:
patent: 3510584 (1970-05-01), Krasin et al.
patent: 3639692 (1972-02-01), Krasin et al.
patent: 3728490 (1973-04-01), Nowicki
patent: 3794770 (1974-02-01), Tabiichi et al.
patent: 3842210 (1974-10-01), Dawson
patent: 4028494 (1977-06-01), Zarouni

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