Patent
1978-01-18
1979-02-13
Brown, Thomas W.
179189D, 179 18DA, H04M 166
Patent
active
041397410
ABSTRACT:
A telephone lock for attachment to a telephone permits a user to dial local calls only with a first predetermined number of digits. Upon lifting a receiver/speaker from a cradle connected to the telephone lock, a counting device counts the first number of digits. A ratchet wheel rotatably mounted on the lock is advanced from an initial position by a first preset angle against the action of a spring by a ratchet wheel advancement device, following dialing of one of the predetermined number of digits. A first dialing stop device restrains the user from dialing at least one of the digits on a dialing device for reaching the operator on an initial dialing, and a second dialing device restrains the user from dialing an additional number of digits, when the ratchet wheel has advanced from the initial position by a second preset angle. When the receiver/speaker has been replaced on the cradle, the dialing device is reset to a starting position.
REFERENCES:
patent: 3358087 (1967-12-01), Von Stein
patent: 3511939 (1970-05-01), Aikawa
patent: 3727009 (1973-04-01), Ireland
patent: 3832497 (1974-08-01), Vogt
patent: 3937900 (1976-02-01), Nagakura
patent: 3973083 (1976-08-01), Sekiguchi
patent: 4000380 (1976-12-01), Jackson
patent: 4012602 (1977-03-01), Jackson
patent: 4020295 (1977-04-01), Vuotto
Brigance Gerald L.
Brown Thomas W.
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