The Counterfeit Coin Detector Patent Archive

Every device ever patented to catch a bad coin

Coin selector

Technical patent drawing of a cylindrical coin selector casing with an internal plunger, spring-loaded disk, pivoting valve plate, gauge rods, and an electromagnet assembly used to test and sort coins in a vending machine.COIN-SELECTORGeorge C. Reith and George F. Flade · September 17, 1912Cross-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, 1931Mechanical schematic of a vending-machine coin selector showing gears, pivoted levers, a weighted balancing arm, and chutes for accepting or returning coins.AUTOMATIC FRAUD PREVENTIVE MEANS FOR CHECK CONTROLLED APPARATUSAaron A. Knee · October 11, 1932Patent drawing showing a vertical coin chute mechanism with labeled magnets, pivots, and diverging passages, plus side-view and cross-sectional details of the coin runway construction.COIN SELECTING APPARATUSJohn Gottfried · May 2, 1933Patent drawing of a coin-selecting apparatus showing an inclined upper chute with a movable top rail and ejecting spring leading into a vertical J-shaped chute flanked by magnet pole pieces, with numbered parts and a lower coin return tray.COIN SELECTING APPARATUSJohn Gottfried · August 22, 1933Patent drawing of a coin selector showing a laminated electromagnet with shading coils, a coin chute assembly labeled with numbered parts, and a separate time-switch mechanism with a mercury switch and dashpot piston.SHADED POLE ELECTRIC COIN SELECTORWalter Karl Klose · April 3, 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, 1935Patent drawing of a cylindrical coin selector mechanism with a tubular transfer member, escutcheon plate, calibrating pins, springs, levers, and an adjustable knob, shown in side elevation, cross-section, and multiple transverse sectional views.COIN SELECTOREmmett B. Moore · May 12, 1936Patent 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 mechanical coin and slug selector showing a vertical housing with internal chutes, rollers, and a counter-balanced pivoting arm with adjustable stop screw that sorts coins from light and heavy slugs into separate discharge paths.COIN OR SLUG SELECTOR DEVICE OR ATTACHMENTWilliam M. Christopher · June 22, 1937Patent drawing of a mechanical coin selector showing an angled coin chute, a stack of thin spaced steel plates forming a rebound surface with knife edges, mounting screws, spacer blocks, and a side elevation of the assembled unit with labeled parts 10 through 34.COIN SELECTORBert E. Mills · May 30, 1939Patent 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, 1940Mechanical drawing of a vintage coin selector mechanism showing plates, chutes, a magnet, thickness gauge, pivoted balances, and a stripping linkage for sorting and rejecting coins and washers.COIN SELECTORChristian Gabrielsen · December 22, 1942Patent drawing of a vending machine coin detector showing an inclined coin chute with a magnet, a bounding block, a pivoting pin, and a coin entrance slot with magnetic slug trap, illustrated across multiple mechanical elevation and sectional views.COIN DETECTING APPARATUSAlbert E. Gebert and Floyd C. Black · June 22, 1943Patent drawing showing a coin slot and chute mechanism with heated and unheated contacts, an electromagnet-controlled gate, and accompanying wiring diagrams labeled Fig. 1 through Fig. 5 depicting thermocouple circuits, relays, batteries, and resistors used to distinguish genuine coins from slugs.APPARATUS FOR SEPARATING GENUINE FROM SPURIOUS COINSFred E. A. Wallin · August 24, 1943Patent drawing showing a vending-machine coin selector plate with sloping coin runways, pivoted gates, permanent magnet assemblies, and a pivoted abutment, alongside a signed inventor's certification for John Gottfried.COIN SELECTORJohn Gottfried · January 18, 1944