The Counterfeit Coin Detector Patent Archive

Every device ever patented to catch a bad coin

1930s coin mechanism

Patent drawing showing a long sliding guide plate and strip mechanism with coin apertures, spring trigger, magnet, and abutment arm, illustrated in eight cross-sectional and plan views labeled Fig. 1 through Fig. 8.COIN CONTROLLED DEVICELouis M. Hall · May 16, 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 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 mechanical coin detector showing an angled coin slide feeding into a chute assembly with pivoted weighing pan, counterweighted lever, rotating shaft structures with clutch pins, and branching discharge chutes for coins versus slugs.DETECTORWilliam M. Christopher · March 30, 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, 1937Exploded and sectioned patent drawings of a rectangular coin-detector housing showing sliding gauge levers, a knurled sizing disc, a pivoted weight-measuring pendulum with jaws, and numerous numbered pins, screws, and channels for sorting coins from slugs.COIN DETECTING APPARATUSJohn F. Lindberg · September 23, 1941