Measuring and testing – Coin
Patent
1978-06-26
1980-01-22
Swisher, S. Clement
Measuring and testing
Coin
194100A, 194102, G07F 302
Patent
active
041843665
ABSTRACT:
A coin testing apparatus is designed to accept and test a plurality of different coins, for example some or all of the coins of a particular currency. The apparatus stops an inserted coin in a predetermined position and tests its diameter, composition and thickness. It may also test its weight. Only if an inserted coin, (or object purporting to be a coin,) passes all of these tests will it be accepted. To test the diameter, the inserted coin serves as one electrode of a capacitor. The coin rests by gravity against an inclined board of dielectric material, on the other side of which a plurality of arcuate electrodes are arranged such that, for a coin of predetermined diameter, one electrode will be opposite a position outside the periphery of the coin and another will be opposite a position inside the periphery. The presence of a coin of predetermined diameter will cause a substantial change in the capacity between the coin and said other electrode and is indicated by the capacities between the two electrodes and the coin differing by more than a predetermined value. The composition check involves disposing a coin in an air gap of a single magnetic core having a coil wound thereon. The coil forms part of a tuned circuit of an oscillator whereby each of the plurality of acceptable coins, when present in the air gap, causes the oscillator to operate at a respective different frequency. The thickness check is carried out by monitoring the capacitance between the coin, resting against the inclined board, and a further electrode.
REFERENCES:
patent: 3901368 (1975-08-01), Klinger
patent: 3977508 (1976-08-01), Baumberger
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