The Counterfeit Coin Detector Patent Archive

Every device ever patented to catch a bad coin

Slug rejector

Patent line drawing showing a tall coin-operated cabinet mechanism (Fig. 1) with a hinged coin slide, magnet, push-handle, camera and dash-pan assembly, alongside a detail front view of the money-box (Fig. 3) and a partial side view (Fig. 2) of the slide linkage.COIN FREED OR ACTUATED MACHINE.Helen Alicia Burt · March 29, 1892Patent 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 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 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 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, 1899Patent drawing sheets showing a round coin-operated mechanism with a rotating coin-carrying disk, detector lever, springs, and pawls mounted between two plates, plus detailed cross-sections of the lever and coin slot.COIN-CONTROLLED MECHANISM.Alvah C. Roebuck and Frank McMillan · February 11, 1902Patent drawing showing three figures of a coin-detective device: a two-part block with a spring-loaded plunger, knob, rod, coil spring, and pegs that catch washers while allowing coins to pass through separate discharge outlets.COIN-DETECTIVE.George W. Brown · August 11, 1903Patent drawing of a mechanical coin detector showing a winding coin chute, spaced coin-rests, a pointed sliding bar, an electromagnet, and coin pockets with 'V CENTS' coins visible in the casing.COIN-DETECTORFrederick G. Hartell · April 19, 1904Patent line drawing of a tall vending machine cabinet with an internal coin guideway mechanism, pivoted castings with hooked fingers, chutes, and an ejector rod, shown in section and detail views.FRAUD-PREVENTIVE FOR COIN-CONTROLLED MACHINESMaurice Hofheimer · June 27, 1905Patent 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 of a mechanical gum vending machine cabinet showing an internal coin chute, pivoted testing gate with counterweight, discharging arm with numbered fingers, and separate compartments for genuine coins and rejected slugs.COIN-CONTROLLED SLOT OR VENDING MACHINE AND COIN-TESTING MECHANISM THEREFOR.Louis J. Disser · November 13, 1906Patent drawing of a telephone coin box mechanism showing coin slots, chutes with magnets, a crank-operated shaft with kick-off fingers, and a weighted lever striking a bell to signal valid coin deposit.COIN-CONTROLLED MECHANISM FOR TELEPHONE-BOXES AND THE LIKE.Francis X. Bee · March 10, 1908Patent drawing showing the interior of a vending machine casing with a coin slot, an inclined chute leading to a pivoted dumping table with a hooked gripper arm, and separate accepting and rejecting chutes below, along with detail views of the gripper and shedder mechanism.COIN-SORTING MECHANISMCharles E. Dellenbarger · June 30, 1908Patent 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, 1909Technical 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, 1912Patent 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, 1929Exploded and assembled mechanical drawings of a metal coin chute assembly showing separate side walls, an intermediate wall with an opening, a horseshoe magnet, and a toothed rotating detector wheel that sorts coins from slugs into two discharge paths.COIN DETECTORBenjamin L. Fry · October 22, 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 of a coin depository casing showing front slots for nickels, dimes, and quarters, an internal spring-loaded plunger with sized coin pockets, a notched gauge bar, and U-shaped resilient wire guard fingers designed to reject slugs and improperly sized coins before they reach the delivery chutes.COIN DEPOSITORYHarry Walker · December 30, 1930Cross-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 sheet showing an arch-shaped coin-mechanism casing with a star-shaped coin slot handle, an internal disk-like coin carrier with locking levers and a pivoted horseshoe magnet, and cross-sectional side views labeling numbered parts such as the shaft, magnet support, spring, and locking pin.CHECK CONTROLLED MECHANISMArthur H. Du Grenier · December 29, 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 of a coin-testing apparatus showing a boxy casing with an internal magnetic core, coil, spring-loaded roller, and a hinged armature with coin passages, alongside a perspective view of the finished enclosed device with a coin slot on top.ART OF TESTING COINS OR OTHER TOKENS FOR GENUINENESSFairfield W. Hoban · December 6, 1932Mechanical drawing of a coin detector housing showing a zigzag arrangement of inclined metal anvils, vertical guide strips, an overhead deflecting anvil, a magnet, and two discharge chutes leading to a coin-controlled device and a return cup, with a side cross-section below labeled Fig. 2.SPURIOUS COIN DETECTOR AND EJECTOREmil de Ryss · February 7, 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 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 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 mechanical coin-testing apparatus showing a check receiving chute, electrolytic cell with coin as anode, spring contacts, an electromagnet-actuated deflector pin, and a wiring diagram connecting batteries, relays, and coil solenoids.ELECTRICAL DETECTION AND SEPARATION OF COINS FROM SUBSTITUTESTurner D. Bottome · August 1, 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 an inclined chute apparatus with two electromagnets positioned along the coin path, showing a coin rolling on edge past the magnets and being deflected into separate collection compartments based on its metal composition.ART OF TESTING COINS OR OTHER TOKENS FOR GENUINENESSTheodore M. Edison · February 6, 1934Patent drawing showing a coin-testing device with two transformer coils, a coin chute, a lever-operated detent, and a rotatable disc mechanism for routing accepted or rejected coins, alongside a circuit diagram of the electromagnetic testing system.COIN TESTINGDaniel W. Troy · July 3, 1934Patent drawing of a rectangular slot-machine coin box showing an inclined coin slide leading to a metallic bouncing block, with side sections illustrating the paths taken by genuine coins versus thin or soft metal slugs into a slug pocket.FRAUD PREVENTATIVE DEVICE FOR SLOT MACHINESGust Poulas · October 16, 1934Line drawing of a mechanical coin chute assembly showing a sliding coin tray, a triangular pivoting ejector arm with a coil spring, a shelf with numbered stop pins and discharge slots, and side/cross-section views labeled Fig. 1 through Fig. 4.COIN CHUTEBruno Radtke · July 16, 1935Patent drawing of a coin-operated payphone front panel showing coin slots labeled 25¢, 10¢, and 5¢, a rotary dial, warning text about felony slug use, and internal mechanical diagrams of a spring-loaded plunger device for detecting slugs.SLUG ELIMINATOR FOR COIN OPERATED MECHANISMSRussell J. Hall · March 17, 1936Patent 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 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 showing a side-view mechanical coin detector with an inclined chute, bar magnet, serrated edge member, and ball-in-groove anti-tilt runway, along with cross-sectional and enlarged detail views of the coin-guiding plates and pivoted track member.DETECTING APPARATUSWilliam Patzer · April 13, 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 coin testing device showing a vertical casing with internal chutes labeled A, B, C, D, magnets, pivoted gates, springs, and compartments for sorting coins and slugs by size and weight.COIN TESTING DEVICETheodore Bibicos · June 29, 1937Patent drawing showing a coin-testing mechanism with a rotating carriage, heated contact stud, electromagnet-actuated gate, and two coin chutes, plus accompanying wiring diagrams with a relay, transformer, and vacuum tubes.APPARATUS FOR SEPARATING GENUINE AND SPURIOUS COINSFred E. A. Wallin · February 8, 1938Patent 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, 1939Exploded 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, 1941Patent drawing showing a coin chute with heated and cold electrode contacts, a horseshoe-shaped galvanometer relay, a solenoid with movable core, and branching chutes leading to a rejector path and a genuine-coin box, with accompanying schematic wiring diagrams.DEVICE FOR THE AUTOMATIC DETECTION OF GENUINE COINSJames F. Mullen · June 30, 1942Patent drawing showing a coin chute assembly with a magnet mounted beside an entrance slot, a beveled shoulder, and a retrieval slot for dislodging trapped slugs, illustrated across six labeled figures.COIN DETECTING APPARATUSAlbert E. Gebert and Floyd C. Black · December 15, 1942Mechanical 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, 1942Mechanical drawings of a coin slide apparatus showing a sliding plate with a coin pocket, an obstructing member, electromagnet, heated contact assembly, and a wiring schematic connecting to a relay and transformer circuit.APPARATUS FOR SEPARATING GENUINE FROM SPURIOUS COINSFred E. A. Wallin · March 30, 1943Patent 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, 1944Mechanical line drawings of a coin slug rejector showing a hinged gate, sloping runway, permanent magnet poles, and a flat scavenger spring with actuating lever mounted in a rectangular frame, plus a side elevation and internal cross-section revealing the pivot linkages and coin path.SLUG REJECTOR SCAVENGER FOR MAGNETIC COIN TESTERSLloyd J. Andres · June 5, 1951Mechanical drawing of a coin separator gate showing a pivoted weighted feeler, rotating coin-sizing cradle with projections, runway, magnet, anvil, deflectors, and rejected coin chute, with numbered parts 10 through 68 and inset cross-sections labeled Figs. 1 through 6.APPARATUS FOR REJECTING APERTURED COINSJohn Gottfried · June 21, 1955Technical patent drawing of a vending machine coin tester showing a U-shaped case with chutes, a pivoting arm with a beveled disc, reciprocable plates, an electromagnet and solenoid linkage, and a vertical nickel supply tube, with numbered reference lines throughout.COIN TESTERBoley A. Andrews and Loran A. Shontz, Jr. · November 13, 1956Patent drawing of a coin machine slug ejector showing front and rear views of a boxy mechanism with a pivoted coin chute, horseshoe magnet, solenoid, and switch blades, plus detailed sectional views labeled FIG.1 through FIG.7 with numbered parts and an inventor's signature.COIN MACHINE SLUG EJECTORJules A. Fremon · April 8, 1958