The Counterfeit Coin Detector Patent Archive

Every device ever patented to catch a bad coin

Vending mechanism

Patent drawing of a mechanical coin detector showing front and interior views with a row of coins in a horizontal channel, a vertical entry chute, a spring-loaded slide with finger hole, and small cross-section detail figures at the bottom of the page.COIN-DETECTOR FOR COIN-CONTROLLED APPARATUS.Arthur L. Pratt · May 26, 1896Patent drawing showing five figures of a mechanical coin-guard device with a vertical coin chute, a U-shaped pivoting gate with arms fitting into grooves, a leaf-spring, and a rotating arbor with releasing lever, all numbered with reference numerals like 1 through 21.COIN-GUARD OR CONTROLLING DEVICE FOR COIN-OPERATED MACHINES.Robert Fred. Tochtermann · December 12, 1899Cross-sectional patent drawing of a coin-selecting mechanism showing an inclined entrance slot leading to a vertical main slot with a pivoting anvil, a curved branch slot, a spring-loaded latch, and a lower tray for rejected coins, with a second smaller cutaway view below showing the anvil assembly.COIN-SELECTING DEVICEJoy V. Wigle and John E. Reece · March 31, 1931Patent drawing showing seven mechanical diagrams of a coin chute device with a pivoted bell crank, spring, and pin mechanism that sorts true coins from spurious or lightweight coins into separate collection and rejection passages.SPURIOUS COIN DETECTORCharles A. Fowler · June 6, 1933Patent drawing of a coin selector mechanism showing a side elevation with coin chute, magnet pole pieces with pointed projections, and a pivoted separator edge, plus a cross-section and enlarged pole piece detail.COIN SELECTORJohn Gottfried · March 9, 1937Patent drawing of a coin selector mechanism showing a vertical base plate with an inclined coin chute, a horseshoe magnet with upward-projecting poles, a pivoted kicker arm, adjustable screws and bridge block, and multiple discharge passages for sorting coins by magnetic response.COIN SELECTORBert E. Mills · November 28, 1939Patent drawing of a coin selector showing a rectangular base plate with a coin chute at upper left, a horseshoe magnet mounted mid-plate, multiple dashed trajectory lines labeled with letters showing coin paths, numbered screws and projections, plus three cross-sectional side views (Figs. 2-4) and a top-down sectional view (Fig. 4) of the layered plates and outlet channels.COIN SELECTORJohn Gottfried and Benjamin W. Fry · January 9, 1940Patent drawing showing a coil assembly with windings, a coin-receiving panel with sliding pins, and a detailed vacuum tube relay circuit diagram with multiple coils, resistors, and relay contacts labeled with reference numbers.COIN CONTROLLED OSCILLATOR FOR RELAY OPERATIONAlexander M. Gordon · April 29, 1952