Title: Method of and apparatus for assessing coins

Abstract: The invention relates to a coin validator for use in a micro-processor controlled call coin box telephone instrument. The validator comprises first and second coil sets driven by square wave interrogation pulses. The arrangement of the coils is such that when a coin is in the coin-runway of the call coin box, one coil pair is used to interrogate the coin in the runway while the other coil pair provides environmental conditions apertaining to the runway. The information generated by both coil sets is combined thereby compensating for environmental changes and drift. Information pertaining to the relative response times of the secondary coils is then used to determine coin validity.

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Inventors: Crisp, Malcolm (Swavesey, GB2)
Lewis, Christopher (Ely, GB2)

Application Number: 06/274765
Filing Date: 1981-06-18
Publication_date: 1984-03-13
Assignee: Plessey, Overseas (GB)

Primary Class(es): 194/318 73/163
Other Classes: G07F3/02
US Patent Ref:

3599771	August, 1971	Hinterstocker	194/100A	COIN TESTING DEVICE FOR COMPARING COIN TO BE TESTED WITH A STANDARD COIN
3682286	August, 1972	Prumm	194/100A	METHOD FOR ELECTRONICALLY CHECKING COINS
3797307	March, 1974	Johnston	194/100A	COIN DISCRIMINATOR
3901368	August, 1975	Klinger	194/100A	Coin acceptor/rejector
3962627	June, 1976	Ptacek et al.	194/100A	Electronic apparatus for testing moving coins employing successive time significant sensings of the
4254857	March, 1981	Levasseur et al.	194/100A	Detection device
4326621	April, 1982	Davies	194/100A	Coin detecting apparatus for distinguishing genuine coins from slugs, spurious coins and the like
4349095	September, 1982	Lewis	194/100A	Coin discriminating apparatus

Other Refs: DE1925042DE1930345FR2359468GB1297499GB1523415GB2020469GB2027246GB1575365GB2056736

November, 1970
December, 1970
February, 1978
November, 1972
August, 1978
November, 1979
February, 1980
September, 1980
March, 1981

Primary Examiner: Rolla, Joseph J.
Assistant Examiner: Beyer, Yogi
Attorney: Fleit, Jacobson, Cohn & Price

Claims: