The Counterfeit Coin Detector Patent Archive

Every device ever patented to catch a bad coin

Vending machine

Patent drawing of a tall wooden vending-machine cabinet front and side views, with an enlarged mechanical coin-tester assembly showing hinged plates, springs, pins, and a coin diagram labeled with letters D, E, F, m, n, o, p.COIN CONVEYER AND TESTER FOR AUTOMATIC VENDING-MACHINES.John H. Volkmann · September 27, 1892Patent drawing of a 19th-century coin detector showing an angled chute with a pivoted magnet, lever, and push-off mechanism for trapping and ejecting false iron or steel coins from a vending machine.COIN-DETECTOR FOR AUTOMATIC VENDING-MACHINES.Alexander Jaeger · July 28, 1896Patent drawing of a mechanical coin-tester showing a hinged plate assembly with a pivoted magnet, coin track, and washer-catcher arm mounted inside a tall vending-machine cabinet.VENDING-MACHINEJohn H. Volkmann · February 8, 1898Patent drawing of a coin-tester mechanism showing an inclined housing with a slotted plate, pivoted magnet, and hooked washer-catcher arm inside a metal frame, illustrated from multiple side and sectional views.COIN-TESTER FOR COIN-CONTROLLED APPARATUS.John H. Volkmann · October 4, 1898Patent drawing of a vertical coin-chute mechanism showing a slidable coin-receiver with springs, a thrust-rod and handle at top, and a pivoted lever and follower-rod assembly that releases the coin only when the receiver is fully inserted, with a detailed washer-blocking cross-section and a coin depicted lodged in the receiver.FRAUD-PREVENTING DEVICE FOR COIN-CONTROLLED APPARATUSOscar E. Sorg · January 7, 1902Patent drawing of a mechanical coin detector showing an inclined chute with a magnet and pivoted retarding arm feeding into a curved segmental chute, which delivers coins onto a spring-loaded pivoting tilting bar mounted inside a vending machine case.COIN-DETECTOR FOR VENDING-MACHINES.Claude Bigelow · July 11, 1905Patent drawing sheets showing a mechanical coin-slot fraud preventive device with a hinged plate, adjustable stop, spring-loaded roller, handle rod, and return chute, illustrated across twelve labeled figures with numbered parts.FRAUD-PREVENTIVE DEVICE FOR COIN MECHANISMS.John Fritsche · April 30, 1907Patent drawing of a rectangular vending-machine coin box housing two parallel slotted shafts with gear wheels, springs, set screws, and diverging chutes, shown in six views labeled Fig. 1 through Fig. 6.SPURIOUS-COIN DETECTOR FOR VENDING-MACHINES.Leslie A. Vandiver · May 4, 1909Two mechanical drawings of a vending machine coin mechanism showing a vertical coin tube with a counterbalanced testing lever, rejection spout, and a rotating pocketed release disc connected to a handle and discharge tube.COIN-RECEIVING MECHANISM FOR VENDING MACHINESRufus B. Sherburne, Leon G. Sherburne, and Martin Hansen · May 17, 1927Patent drawing sheets showing exploded mechanical views of a coin-controlled dispensing machine with an inclined disk passage, gauge plates, pivoted deflecting arms, a magnet, and a reciprocating coin carrier tray, labeled with numbered reference lines.COIN-CONTROLLED MECHANISMArthur H. Du Grenier · February 12, 1929Patent drawing showing a coin-testing chute with an electromagnet coil, lever-operated slow-opening switch, and circuit diagram, plus a second bench-top device with an adjustable coin-support arm and graduated scale for dimes through dollars.METHOD OF AND MEANS FOR TESTING COINSFrederic H. Brinkerhoff · May 27, 1930Patent drawing showing a coin slot mechanism with a support plate, sliding coin-carrying strip with handle, housing with lateral flanges, ridges and studs for anti-fraud protection, and a magnet-equipped trigger arm, illustrated in seven labeled figures including top, side, and cross-sectional views.COIN CONTROLLED DEVICELouis M. Hall · February 14, 1933Patent drawing showing an inclined coin guide tube feeding into a tiltable weighing scale with adjustable counterweight, guide strips, and separate receiving and return channels, with two smaller cross-section figures below detailing the hanger yoke and weight assembly.FRAUD PREVENTIVE DEVICEHobart J. Halsted · April 25, 1933Patent drawing of a coin testing and ejecting mechanism showing an angular coin chute casting with a weighing lever, counterweight bracket, resilient spring lip, and discharge opening, illustrated in six labeled figures with a signature reading B.W. Fry.COIN TESTING AND EJECTING MECHANISM FOR VENDING MACHINESBenjamin W. Fry · November 6, 1934Patent drawing showing a coin chute leading to a pivoted balance arm mechanism with weighted counterlevers that tips one way to accept or another way to reject a check based on its weight.CHECK SELECTING APPARATUSRalph D. Lynch · July 23, 1935