Electronic trigger for prepay type telephone paystations

Details Electronic trigger for prepay type telephone paystations Electronic trigger for prepay type telephone paystations

1990-03-09

1991-01-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

453 4, G01N 904

Patent

active

049888609

ABSTRACT:
A trigger switch for use in coin operated devices and particularly in telephone paystations consisting of a plurality of parallel channels each including one or more openings through which a light beam passes. Deposit of coins in the appropriate channels blocks one or more light beams passing through the openings causing detection of the light blockage by associated light detectors to operate to give an indication of the quantity and value of coins deposited through the coin channels. A common trigger mechanism is also included and operates in response to deposit of any coins through the trigger switch, to provide operation of an associated coin relay.

REFERENCES:
patent: 3916922 (1975-11-01), Prumm
patent: 4082099 (1978-04-01), Iwersen
patent: 4228811 (1980-10-01), Tanaka et al.
patent: 4436103 (1984-03-01), Dick

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