The Counterfeit Coin Detector Patent Archive

Every device ever patented to catch a bad coin

19th century patent

Patent drawing showing a mechanical coin-counting apparatus with paired vertical guide channels, a central tilting balance plate, adjustable counterweights on threaded arms, and swinging vanes directing coins to separate receptacles, shown in top view and two cross-sectional views.IMPROVEMENT IN COIN-COUNTERSAron Bernstein · October 31, 1876Patent drawing showing a small tilting platform device with hooked gages that hold a fifty-cent coin in place, a knife-edge pivot beneath the platform, and a hidden balance-weight chamber, illustrated in level and tipped positions plus a top-down view of the coin secured by the gages.IMPROVEMENT IN COUNTERFEIT-COIN DETECTERSJohn Wiarda · March 20, 1877Technical patent drawing showing a bent metal bar with flanges and paired clasping lugs used as a tipping balance to test coin weight, alongside cross-section and alternate frame views.IMPROVEMENT IN COUNTERFEIT-COIN DETECTERSJohn A. Thompson · April 3, 1877Technical patent drawing of a balance-lever coin detector showing a gage-arm A with cross-pieces B, D, and K on one side, an elongated weighted arm E on the other, pivoted atop a stand G, with additional detail views of the pivot mechanism and gage cross-section.IMPROVEMENT IN COIN-DETECTERSPatrick Doherty · June 19, 1877Patent drawing showing five figures of a pocket coin-testing device with labeled tubes (A), a weighted trip-lever (B), and casing (C), including top views and cross-sections, and a version mounted to a counter or money-drawer.IMPROVEMENT IN COUNTERFEIT-COIN DETECTERS.William H. Rice · October 16, 1877Patent drawing showing a beam scale with a slotted coin pan and vertical gauge plate, plus a secondary weighted beam marked for gold and silver coin denominations, alongside a base-mounted support stand.IMPROVEMENT IN COMBINED SCALE AND COIN-TESTERGeorge Hoag · June 3, 1879Patent drawing showing a boxed coin-detector mechanism with a pivoting weighted lever, coin pans, a scale-beam arm with a hook, and a coin-roll compressor with sliding guides, illustrated in five labeled figures.COIN-DETECTOREmil Bachmann · September 18, 1883Patent drawing of a coin-controlled weighing scale showing a circular graduated dial (Fig. 1) with a pivoted covering bar, gears, and internal mechanism including a coin chute, coin-receiver, tripping arms, and rack-and-pinion assembly housed within a wooden case.COIN-CONTROLLED WEIGHING-SCALEGeorge P. Hill and Albert L. Washburn · September 11, 1888Patent drawing showing a tall cylindrical vending-machine casing with an internal zigzag coin race suspended on a spring and shaft, alongside detail views of the zigzag race sections, a plan view of the rotating coin chute, and a side elevation of an alternative lever-and-weight support mechanism.MACHINE FOR THE ASSORTMENT OF COINS.Henry C. Hart · October 20, 1891Patent 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 showing six figures of a coin-slot protection mechanism with a reciprocating slide, spring-loaded ejector, magnet, and coin chute, plus hand-operated views of a coin being inserted.MEANS FOR PROTECTING RECEIVING-OPENINGS OF COIN-CONTROLLED MACHINES.Almy Le Grand Peirce · March 20, 1894Patent drawing of a coin-introducing device showing four figures: a top plan view of a square plate with a central rotating disk and crank, a side sectional view with a chute below, a plan view of the middle plate with circular openings labeled b, c, and d, and a bottom plate view with three circular openings labeled for cent, nickel coin, and a central opening.COIN-INTRODUCING DEVICE FOR COIN-CONTROLLED VENDING-MACHINES.Willard H. Gilman · October 8, 1895Patent drawing of a slender pencil-shaped metal holder with a pointed pencil tip at one end and a rounded eraser cap at the other, showing an extendable pivoting arm and a sliding notched sleeve marked with coin denomination numbers along its graduated scale.COMBINED PENCIL-HOLDER, ERASER-HOLDER, AND COIN-TESTER.Rudolph Wm. Riess · November 12, 1895Patent drawing of a clock-like bonus-determining device with a large numbered dial on a pedestal base flanked by matchbox holders, showing internal gears, a coin-rotated spider wheel, and a rocking valve mechanism in cross-section views.BONUS-DETERMINING DEVICE.Judson H. Drobisch · April 6, 1897Patent 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, 1899