US3317016A - Coin selecting device - Google Patents

Coin selecting device Download PDF

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Publication number
US3317016A
US3317016A US457694A US45769465A US3317016A US 3317016 A US3317016 A US 3317016A US 457694 A US457694 A US 457694A US 45769465 A US45769465 A US 45769465A US 3317016 A US3317016 A US 3317016A
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United States
Prior art keywords
coin
coil
frequency
rotor
oscillator
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US457694A
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English (en)
Inventor
Pierre P Turillon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huntington Alloys Corp
Original Assignee
International Nickel Co Inc
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Publication date
Application filed by International Nickel Co Inc filed Critical International Nickel Co Inc
Priority to US457694A priority Critical patent/US3317016A/en
Priority to GB16070/66A priority patent/GB1140232A/en
Priority to BE679721D priority patent/BE679721A/xx
Application granted granted Critical
Publication of US3317016A publication Critical patent/US3317016A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D5/00—Testing specially adapted to determine the identity or genuineness of coins, e.g. for segregating coins which are unacceptable or alien to a currency
    • G07D5/08—Testing the magnetic or electric properties

Definitions

  • the present invention is directed to an electronic coin selector and, more particularly, to an electronic coin selector especially capable of distinguishing coins containing a controlled amount of ferromagnetic phase from coins made of other materials.
  • This special coinage material contains no silver but is/nevertheless, interchangeable on a practical basis with silver coinage material in coin selector devices operating upon the eddy current principle.
  • This special coinage material comprises principally a white nonmagnetic nickel alloy, for example, an alloy containing about 5% the balance nickel, and contains therein a small amount, e.g., about 0.5% to about 3%, of a ferromagnetic material, advantageously, as an inner layer of the coinage material.
  • a satisfactory ferromagnetic material for use in this special coinage material comprises about 79%' nickel, about 5% molybdenum and the balance essentially iron.
  • the aforementioned coin selector devices operating on the eddy current principle represent the product of many years experience in separating the standard silver alloy coinage from slug materials on the basis of the low resistivity of the standard 90% silver-% copper alloy coinage.
  • the resistivity of the 'alloy is measured by means of a magnetic gate wherein the coin is caused to pass a permanent magnet having a field strength in the neighborhood of about 500 oersteds whereby eddy currents are generated in the coin due to magnetic induction.
  • the principle involved is that of frictional slowing due to physical contact between the coin and the eddy current magnet.
  • the special controlled amount of ferromagnetic phase present in the special coinage material provides therein magnetic properties, including permeability and the like, which can be precisely controlled. These magnetic properties furthermore differ materially from those of other known metallic and nonmetallic materials.
  • FIGURE 1 is a schematic representation of apparatus contemplated in accordance with the invention.
  • FIGURES 2 through 8 are front elevational views of apparatus contemplated in accordance with the invention illustratingthe apparatus and its mode of operation;
  • FIGURE 9 is a cross-sectional view of the apparatus as depicted in FIGURE 6 at the section 9-9 depicted thereon;
  • FIGURE 10 is a cross-sectional view of the apparatus as depicted in FIGURE 4 at the section 10-40 depicted thereon;
  • FIGURE 11 is a circuit diagram depicting circuitry appropriate for use in the coin selector device contemplated in accordance with the invention.
  • the coin-discriminating means contemplated in accordance with the invention for discriminating coins made of a composite material comprising a nonmagnetic metal and a small controlled amount of a ferrornagnetic material comprises a coin passageway having accept and reject passages, a sensing field located in relat-ion to said passageway adapted to sense said coin and to emit a preselected signal when said coin is in sensing position, and means connected to said sensing field opin rotor 22 (FIGURE 3).
  • magnetic permeability is the property of the special coinage material containing a controlled amount of ferromagnetic phase to be sensed by the aforementioned sensing means.
  • the sensing or detecting means advantageously comprises an oscillator, including a coil tuned such that insertion in the core thereof of a coin having the aforementioned property moduates the resonant frequency of the oscillator to a preselected value.
  • the signal thus created may be amplified by convenient means connected to said oscillator and transmitted to a frequency selector device which is actuated in response to the preselected signal so as to actuate a selector device.
  • FIGURE 1 A satisfactory device in accordance with the foregoing is depicted schematically in FIGURE 1.
  • reference character 11 is a coil having a core adapted to receive coin 12.
  • Oscillator 13 is connected to coil 11.
  • Coil 11 and oscillator 13 are tuned to create a given frequency having a value F when no metallic material is present in the core of coil 11.
  • the frequency of the oscillator is shifted to a preselected value F determined by the magnetic properties of the coin.
  • the oscillator frequency is amplified by the amplifier '14 connected thereto and the amplified signal is transferred to the frequency selector device 15 which is responsive to said preselected frequency F and may, for example, be a'reed or a filter. Actuation of the frequency selector 15 completes the circuit to relay 16 and operates the selector device.
  • Power source 17 is employed to provide the DC. power necessary to operate the device.
  • FIGURES 2 through 10 depict in front and side views an operative device contemplated in accordance with the invention and depict various stages in the course of its operation.
  • the device comprises a backing plate 18 having mounted thereon front plate 19, rear plate 20, a coin slot 21, a rotor 22 tiltable in the plane of plates 19 and 20 about eccentric pivot 23, and having a slot-like opening 22A, and a separator 24.
  • Said coin slot 21, rotor 22, plates 19 and 20 and separator 24 form a coin passageway having accept passage 25 and reject passage 26.
  • Sensing coil 11 is wrapped about the portion of rotor 22 defining opening 2 2A and accordingly rotor 22 is made of a constructional material such as a plastic which does not interfere with the passage of magnetic lines of force therethrough.
  • Rotor 22 is provided with counterbalance means 27 such that, at rest, rotor 22 is in balanced upright position about pivot 23.
  • Leads 28 conveniently pass to circuitry mounted on the back of plate 18 through pivot 23.
  • Magnet 29 is mounted in slot 21 to retain slugs or washers made of strongly ferromagnetic material such as steel.
  • coil 11 is part of an oscillator circuit tuned such that insertion of a coin having the required amount of ferromagnetic phase in the core of coil 11 modulates the resonant frequency of the oscillator to a preselected range which actuates frequency responsive device (FIGURES 1 and 111) thereby completing the circuit to solenoid 16 and causing stop 30, connected to the solenoid armature, to be driven into the path of rotor 22.
  • frequency responsive device FIGURES 1 and 111
  • stop 30 has been actuated as a result of the emission of the preselected signal from the oscillator and rotor 22 has been halted in its rotation above separator 24 and coin 12 has been transferred to accept passage 25.
  • rotor 22 continues in its rotation until halted by fixed stop 31 and the coin is transferred to reject passage 26.
  • rotor 22 is returned by counterbalance means 27 to the upright position.
  • FIGURES 6, 7 and 8 depict the operational sequence employed when a steel slug or washer or other strongly ferromagnetic material is inserted in the device.
  • the slug 12 adheres to magnet 29, which is a permanent magnet having a field strength on the order of, for example, 500 oersteds.
  • coin return means 32 provided with spring 33 is depressed.
  • Coin return means 32 is guided by pins 34 sliding in slots 35 in front plate 19 and is connected through lever 36 pivoted at 37 to wiper blade 38 which is pivoted at 39.
  • Coin return means 32 is also connected to rotor 22 through linkage 40, also pivoted at 39, and linkage 41 connected to rotor 22 at point 42 to provide a lever arm in relation to rotor pivot 23.
  • Linkage 41 is connected to linkage 40 at 43.
  • a loop is provided in linkage 41 to avoid restraint in rotation of rotor 22 when a coin is inserted in opening 22A in rotor 22.
  • FIGURE 9 is a cross-sectional view taken at section 9-9 in FIGURE 6 depicting conditions at the time a strongly ferromagnetic coin or slug is inserted in slot 21 which is retained by magnet 29. Stop 30 attached to or forming part of the armature of solenoid or relay 16 is retracted since no signal has yet given, and the ferromagnetic slug must be cleared or swept from magnet 29 by actuating coin return means 32 and the linkages as sociated therewith as described hereinbefore in conjunc'- tion with FIGURES 6, 7 and 8.
  • FIGURE 10 is a cross-sectional view taken at section 10-10 in FIGURE 4 depicting the operation of the coin selector device at the point where the rotor 22 has been halted in its rotation by stop 30 which is attached to or forms part of the armature of solenoid or relay 16 mounted on the 'back of backing plate 18.
  • Acceptable coin 12 is shown in accept passage 25 between plates 19 and 20 after having rolled out of the slot-like opening 22A in rotor 22.
  • FIGURE 11 depicts circuitry appropriate for use in conjunction with the mechanical arrangement depicted in FIGURES 2 to 10.
  • Oscillator 13 is tuned to the desired frequency F by means of variable inductor 46.
  • the oscillator circuit comprises transistor 47, condensers 48 and 49 and resistors 50, 51 and 52, connected as shown in the drawing.
  • the signal from the oscillator circuit is amplified by amplifier 14 which represents conventional circuitry and is depicted as a two-stage amplifier comprising stages 53 and 54 and when the preselected signal of frequency F is emitted by oscillator 13 upon insertion of a coin having proper controlled magnetic characteristics in the core of coil 11, reed 15 responsive to frequency F is actuated completing the circuit to solenoid 16 and driving the stop 30 forward so as to halt rotation of the rotor as described hereinbefore.
  • Power supply means 17 is depicted having reference to a multiple tap rectifier provided With leads 17A, 17B and 17C to supply power for the oscillator circuit, the amplifier, the reed relay, and the solenoid.
  • Example I I norder to demonstrate that the frequency shift of a tuned oscillator-coil circuit due to insertion in the core of a coil of a coin-size disc made of a sandwich-type composite material comprising outer layers of an alloy containing about 95% nickel and 5% silicon with a controlled amount, i.e., about 2% by volume, of high permeability core alloy containing about 79% nickel, about 5% molybdenum and the balance essentially iron comprises the basis for a coin selector or indicator device, a test circuit was constructed, The circuit comprised a coil of 400 turns of 32 AWS gage enameled wire wrapped about a structural plastic coil form having a rectangular slot Core: Resonant frequency, c.p.s.
  • the foregoing data demonstrate that the special composite coinage material described hereinbefore possesses unique properties differing from the properties of other common metallic materials and that the shift in resonant frequency of a tuned oscillator can be employed as a basis for distinguishing the special composite material from other materials. It will be noted from the foregoing data that a number of the metallic materials actually increased the resonant frequency of the oscillator whereas the special composite material reduced the resonant frequency as compared to the air core frequency.
  • the data demonstrate that a device in accordance with the invention can be tuned to accept the standard silver alloy coinage material but a device so tuned would not accept the composite coinage material. By employing in parallel a device tuned to accept the special coinage material containing a controlled amount of ferromagnetic phase and a device tuned to accept silver coinage, both types of coinage could be accepted.
  • sensing coil 11 comprised 3000 turns of 38 gage AWS enameled wire wound upon a structural plastic coil form having a slot designed to accept a coin having the physical dimensions of a standard U.S. twenty-five cent piece.
  • the structural plastic coil form had the physical appearance of rotor 22 in the drawing.
  • the combination of oscillator 13 and coil 11 where tuned to a resonant frequency of 1500 cycles per second when a coin having the physical dimensions of a US. twentyfive cent piece made of an alloy containing nickel and 5% silicon and having a core comprising about 2% of the coin volume made of a ferromagnetic alloy containing about 79% nickel, about 5% molybdenum and the balance essentially iron was inserted in the coin receiving cavity in rotor 22.
  • the signal from oscillator 13 was amplified and fed to a frequency selective reed relay 15 which was responsive to a frequency of 1500 cycles per second within a frequency band of plus or minus 0.5%. It was found that coins containing 2% by volume of ferromagnetic alloy were accepted by the device On the other hand, coins containing 1.8% and 2.2% of the ferromagnetic alloy but which were otherwise identical were rejected 100%. Again, common slug materials such as steel washers, zinc discs, copper discs and brass discs were rejected 100%, as were standard U.S. twentyfive cent pieces. Composites of copper and stainless steel which were accepted 100% in coin selector devices of the eddy current type along with US. twenty-five cent pieces were rejected 100% by the device contemplated in accordance with the invention. It was found that the device withstood repeated handling and transportation while retaining its highly selective characteristics. The device is fail-safe since failure of the power supply or of any electrical component results in rejection of all coins.
  • coil 11 is in parallel with a fixed capacitor. Accordingly, the frequency of oscillation of the field in coil 11 is inversely proportional to the square root of the inductance of coil 11.
  • the inductance of coil 11 is essentially constant.
  • the coil acts as a iron core coil.
  • direct current continually passes through the coil in order to bias the transistor in the oscillator circuit. This direct current is of a low order so that power drain in the oscillator is low and can be supplied, for example, by a small capacity battery.
  • a direct current on the order of about one milliampere is satisfactory.
  • the direct current creates a magnetizing force in the field of the coil.
  • this magnetizing force may be on the order of about 0.1 to about 100 oersteds, e.g., about 1 to about 30 oersteds.
  • the amplitude of the alternating current in the coil is determined by the oscillator and is essentially constant when the coil is operating as an iron core coil.
  • the frequency of the alternating current in the coil and oscillator changes by a small factor upon insertion of a metal disc into the coil field.
  • the effect of frequency upon the inductance of the coil is negligible when the coil frequency is in the audio frequency range, i.e., a frequency of at least about 10 cycles but lower than 100 kilocycles per second and, advantageously, not in excess of about 50 or even about 20 kilocycles per second.
  • Prequencies in the radio frequency range i.e., above 100 kilocycles per second, are avoided because of the skin effect found when such frequencies are employed.
  • the DC. field causes the core to be magnetized by a constant magnetizing force.
  • this magnetizing force will be at a low point on the BH curve.
  • the AC. component of the magnetizing force will then carry a ferromagnetic c'ore through a hysteresis loop whose slope is not the same as the slope of the magnetization curve (BH curve).
  • the slope of this hysteresis loop is the incremental permeability at a given field strength.
  • the value of incremental permeability approaches a low value asymptotically as the induction B on the 'BH curve approaches a substantially constant value.
  • the incremental permeability will have a substantial value, whereas in instances wherein the magnetizing force of the coil 11 is sufficient substantially to magnetically saturate the ferromagnetic material, the incremental permeability will be of a low value.
  • a ferromagnetic material such as pure nickel will have about the same incremental permeability as will a coin made of a nonmagnetic material such as a 95% nickel-% silicon alloy and containing about 2% of a ferromagnetic alloy containing about 79% nickel, about 5% molybdenum and the balance essentially iron.
  • pure nickel has a much larger saturation induction than a coin containing only about 2% of the aforementioned high permeability (ferromagnetic) alloy and would be held by magnet 29.
  • counterbalanced, pivoted rotor 22 operates as a weighing device for coins.
  • This feature of the design contemplated in accordance with the invention provides for great simplification of the apparatus.
  • a short delay in the passage of the coin is interposed through the use of the rotor 22 bearing the sensing coil 11 thereon which affords a response time for actuation of the frequency selector 15.
  • a response time of about 100 milliseconds is required.
  • other frequency selector devices characterized by more rapid action than a reed can be employed as the frequency selector device 15.
  • the sensing coil 11 can be located in fixed relation to the coin passageway and other known devices for weighing and sizing coins may be employed in the coin selector unit.
  • the sensing coil 11 is in fixed location to the coin passageway, the coin passageway itself can take other forms from that depicted in the drawing.
  • the electronic circuitry provided in accordance with the invention is susceptible to miniaturization with the result that it may be manufactured on a high production basis at low cost.
  • a further feature of the apparatus is that a material compensating effect in regard to temperature is achieved thereby.
  • the frequency of oscillation in oscillator circuit 13 decreases.
  • the magnetic permeability of the coinage material to be selected also decreases with temperature increase and this factor results in an increase in the frequency of the oscillator circuit.
  • additional temperature compensating means may be supplied.
  • the selector mechanism 16 may take other forms which avoid the use of moving parts in the coin selector mechanism.
  • the selector mechanism can be an electromagnet operative in response to a signal from frequency selector device 16.
  • the coin passageway can be provided with appropriate tracks or chutes for accept and reject passages. It is to be understood that coins containing a controlled small proportion of ferromagnetic material (usually not more than about 3% by volume, of the coinage material) will be attracted to a magnet having a field strength of about 500 oersteds but will not adhere thereto.
  • This attribute of the special coinage material selected by the mechanism contemplated in accordance with the invention enables shunting of the special selected coins toward the magnet to an accept passage under the impetus of a magnet whereas coins and slugs made of nonmagnetic material continue in their path unaffected by the magnet and are rejected.
  • relay or solenoid 16 can be operatively connected to a myriad of indicating or signalling devices, including switches, lights, audible alarms, cameras and other devices which may be employed to signal and/or record the fact that a spurious coin has been deposited in a coin collecting, coin sorting or coin-operated device.
  • indicating or signalling devices including switches, lights, audible alarms, cameras and other devices which may be employed to signal and/or record the fact that a spurious coin has been deposited in a coin collecting, coin sorting or coin-operated device.
  • the apparatus provided in accordance with the invention could be connected such that a signal light remained red upon deposit of a spurious coin or slug but turned green upon deposit of a coin containing a controlled amount of ferromagnetic phase.
  • coin sorting devices the presence of a spurious coin in a series of coins could be signalled by appropriate means upon passage of the coins through or past the sensing coil.
  • a coin selector device for selecting a coin having a controlled magnetic property comprising a coin passageway, an oscillator including a coil about said passageway tuned to provide a resonant audio frequency when said coil has an air core and to provide a modulated resonant audio frequency when said coin forms the core of said coil, a frequency selective device responsive to said modulated audio frequency from said oscillator and selector means responsive to said frequency selective device adjacent said passageway to select said coin.
  • a coin selector device according to claim 1 wherein the frequency selective device is a reed.
  • a coin selector device according to claim 1 wherein the frequency selective device is a filter.
  • a coin selector device according to claim 1 wherein said frequencies do not exceed about 50 kilocycles.
  • the combination for selecting a coin comprised essentially of nonmagnetic metal but containing a small controlled amount of a ferromagnetic phase insufficient to cause said coin to cling to a permanent magnet but sufficient to cause physical contact bet-ween said coin and a permanent magnet having a field strength of about 500 oersteds when said coin is caused to pass said magnet comprising a coin passageway, an alternating current sensing field oscillating at a resonant frequency in the audio range adjacent said pas sageway, said sensing field being modulated to a different resonant frequency in the audio range when said coin containing a ferromagnetic phase is in sensing relation to said field, and means operative in response to said modulated audio frequency from said sensing field to select said coin and to reject coins which do not similarly modulate said oscillating sensing field.
  • the combination for selecting a coin comprised essentially of nonmagnetic metal but containing a small controlled amount of a ferromagnetic phase insufficient to cause said coin to cling to a permanent magnet but sufficient to cause physical contact between said coin and a permanent magnet having a field strength of about 500 oersteds when said coin is caused to pass said magnet
  • a coin passageway a permanent magnet adjacent said passageway to stop ferromagnetic coins
  • a coin selector device for selecting a coin of a given denomination made of a nonmagnetic nickel alloy and containing an inner layer of a ferromagnetic alloy in a controlled amount such that said coin is attracted by a permanent magnet having a field strength of the order of 500 oersteds but does not adhere thereto which comprises mechanical means including a coin passageway, a permanent magnet adjacent the entrance of said coin passageway, a rotor interposed in said passageway and accept and reject passages in said passageway past said rotor, interconnected mechanical means for rotating said rotor from an upright to an inverted position and for wiping the surface of said magnet, a first cup mounted upon said rotor interposed in said coin passageway when said rotor is in said upright position and a second cup mounted upon said rotor interposed in said coin passageway when said rotor is in said inverted position, said rotor being rotatable by gravity when said coin is in said first cup, a sensing coil about said first cup, an oscillator connected
  • ROBERT B REEVES, Primary Examiner.

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US457694A 1965-05-21 1965-05-21 Coin selecting device Expired - Lifetime US3317016A (en)

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US457694A US3317016A (en) 1965-05-21 1965-05-21 Coin selecting device
GB16070/66A GB1140232A (en) 1965-05-21 1966-04-12 Improvements relating to coin discriminating devices
BE679721D BE679721A (pm) 1965-05-21 1966-04-19

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3561580A (en) * 1968-02-05 1971-02-09 Autelca Ag Coin tester having a pair of induction coils
US3738468A (en) * 1971-04-28 1973-06-12 M Prumm Coin checking device
US3796295A (en) * 1969-03-31 1974-03-12 Fatme Spa Electronic metal coin analyser
US3952851A (en) * 1973-05-18 1976-04-27 Mars, Inc. Coin selection method and apparatus
US4334604A (en) * 1979-03-15 1982-06-15 Casino Investment Limited Coin detecting apparatus for distinguishing genuine coins from slugs, spurious coins and the like
US4354587A (en) * 1980-10-17 1982-10-19 Third Wave Electronics Company, Inc. Coin acceptor or rejector
US4359148A (en) * 1980-10-28 1982-11-16 Third Wave Electronics Company, Inc. Coin acceptor or rejector
US4546869A (en) * 1982-02-12 1985-10-15 Mars Incorporated Coin testing apparatus
US4574936A (en) * 1983-05-10 1986-03-11 Lance Klinger Coin accepter/rejector including symmetrical dual feedback oscillator
EP0151864A3 (en) * 1984-01-03 1986-09-10 Starpoint Electrics Limited Coin checking apparatus
US4936435A (en) * 1988-10-11 1990-06-26 Unidynamics Corporation Coin validating apparatus and method
US5226520A (en) * 1991-05-02 1993-07-13 Parker Donald O Coin detector system
US5293980A (en) * 1992-03-05 1994-03-15 Parker Donald O Coin analyzer sensor configuration and system
US5392891A (en) * 1994-02-10 1995-02-28 Raytheon Company Apparatus and method for discriminating coins based on metal content
US5509521A (en) * 1991-08-23 1996-04-23 Northwestern Corporation Coin mechanism for vending machine for handling magnetic coins
US5566808A (en) * 1994-09-09 1996-10-22 Parker Engineering & Manufacturing Co. Low profile coin analyzer apparatus
US5609235A (en) * 1995-08-23 1997-03-11 Machine-O-Matic Limited Coin mechanism with magnetic coin discriminator
WO2016161393A1 (en) * 2015-04-01 2016-10-06 Crane Payment Innovations, Inc. Active coin control device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB451694A (en) * 1934-11-07 1935-05-09 Walter Roth Method of testing coins and device for carrying out same method
US2304996A (en) * 1939-12-23 1942-12-15 Advance Machine Co Coin detecting apparatus
US2642974A (en) * 1949-11-30 1953-06-23 Harold H Ogle Jr Coin material testing device
US2918158A (en) * 1958-04-29 1959-12-22 William I Shlank Token for a check-controlled system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB451694A (en) * 1934-11-07 1935-05-09 Walter Roth Method of testing coins and device for carrying out same method
US2304996A (en) * 1939-12-23 1942-12-15 Advance Machine Co Coin detecting apparatus
US2642974A (en) * 1949-11-30 1953-06-23 Harold H Ogle Jr Coin material testing device
US2918158A (en) * 1958-04-29 1959-12-22 William I Shlank Token for a check-controlled system

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3561580A (en) * 1968-02-05 1971-02-09 Autelca Ag Coin tester having a pair of induction coils
US3796295A (en) * 1969-03-31 1974-03-12 Fatme Spa Electronic metal coin analyser
US3738468A (en) * 1971-04-28 1973-06-12 M Prumm Coin checking device
US3952851A (en) * 1973-05-18 1976-04-27 Mars, Inc. Coin selection method and apparatus
US4334604A (en) * 1979-03-15 1982-06-15 Casino Investment Limited Coin detecting apparatus for distinguishing genuine coins from slugs, spurious coins and the like
US4354587A (en) * 1980-10-17 1982-10-19 Third Wave Electronics Company, Inc. Coin acceptor or rejector
US4359148A (en) * 1980-10-28 1982-11-16 Third Wave Electronics Company, Inc. Coin acceptor or rejector
US4546869A (en) * 1982-02-12 1985-10-15 Mars Incorporated Coin testing apparatus
US4574936A (en) * 1983-05-10 1986-03-11 Lance Klinger Coin accepter/rejector including symmetrical dual feedback oscillator
EP0151864A3 (en) * 1984-01-03 1986-09-10 Starpoint Electrics Limited Coin checking apparatus
US4936435A (en) * 1988-10-11 1990-06-26 Unidynamics Corporation Coin validating apparatus and method
US5226520A (en) * 1991-05-02 1993-07-13 Parker Donald O Coin detector system
US5509521A (en) * 1991-08-23 1996-04-23 Northwestern Corporation Coin mechanism for vending machine for handling magnetic coins
US5293980A (en) * 1992-03-05 1994-03-15 Parker Donald O Coin analyzer sensor configuration and system
US5439089A (en) * 1992-03-05 1995-08-08 Parker; Donald O. Coin analyzer sensor configuration and system
US5392891A (en) * 1994-02-10 1995-02-28 Raytheon Company Apparatus and method for discriminating coins based on metal content
US5566808A (en) * 1994-09-09 1996-10-22 Parker Engineering & Manufacturing Co. Low profile coin analyzer apparatus
US5609235A (en) * 1995-08-23 1997-03-11 Machine-O-Matic Limited Coin mechanism with magnetic coin discriminator
WO2016161393A1 (en) * 2015-04-01 2016-10-06 Crane Payment Innovations, Inc. Active coin control device
CN107615340A (zh) * 2015-04-01 2018-01-19 克兰佩门特创新股份有限公司 主动硬币控制装置

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BE679721A (pm) 1966-10-19
GB1140232A (en) 1969-01-15

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