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Publication numberUS2161594 A
Publication typeGrant
Publication dateJun 6, 1939
Filing dateJan 5, 1939
Priority dateJan 5, 1939
Publication numberUS 2161594 A, US 2161594A, US-A-2161594, US2161594 A, US2161594A
InventorsRuth John H
Original AssigneeRuth John H
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Counterfeit money detector
US 2161594 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)


Patented `lune 6, 1939 UNITED STATES PATENT OFFICE 3 Claims.

'I'his invention relates to devices for detecting counterfeit money.

One object of the invention is to provide a device for detecting counterfeit money by im- 5 proved means affording direct magnied comparison with known genuine money.

Another object of the invention is to furnish an improved device of the character described of relatively inexpensive, simple, and compact construction whereby bills of different denominations can be rapidly compared with known genuine bills without causing eye strain and without requiring that too much dependence be placed on the judgment or reliability of the observer.

Heretofore it has been known to examine money by carefully noting the threads or colored strands therein, in order to detect spurious bills. This method depended solely on the fact that paper money is laminated, with fine colored strands incorporated in or between the laminations. Counterfeit bills were known to have-delicate colored ink marks to simulate the colored strands referred to. Hence the observer required experience and had to examine the bills very closely, generally with the unaided eye so that a spurious bill would often escape detection.

The present invention aims to provide a device which is adapted for universal use by retailers, supply houses and other commercial concerns, as

3o well as by banks. It aims to relieve the observer of the strain previously imposed on him by providing a novel method of comparison of the money submitted, with known genuine bills, 'oy reference to the printing on the bills so that the finest lines, dots and spaces or breaks can be noted at a glance. This method is inherently more suited to the ordinary observer than the method of studying the colored strands, because the eye is accustomed to making comparisons, and its 4 accuracy in this regard is easily developed. However, should the observer so desire, he may also use my device for a magnified inspection of the colored strands or texture of the paper particularly at the points bearing the numerals denoting the amount of the bill, because frequently these numerals are changed on an otherwise genuine bill.

It is therefore a further object of the invention to provide an improved device for accom- 5 plishing the method and the advantages above referred to.

Other objects and advantages of the invention will become apparent as the specification proceeds.

u With the aforesaid objects in view, the invention consists in the novel combinations and arrangements of parts hereinafter described in their preferred embodiments, pointed out in the subjoined claims, and illustrated in the annexed drawing, wherein like parts are designated by 5= the same reference characters throughout the several views.

In the drawing:

Figure 1 is a vertical sectional view on the line I-I of Fig. 2, showing a device embodying 10 the invention.

Fig. 2 is a plan view of the device.

The advantages of the invention as here outlined are best realized when all of its features and instrumentalities are combined in one and the 15 same structure, but, useful devices may be produced embodyingr less than the whole.

It will be obvious to those skilled in the art to which the invention appertans, that the same may be incorporated in several different cono structions. The accompanying drawing, therefore, is submitted merely as showing the preferred exemplication of the invention.

Referring in detail, I0 denotes a device for detecting counterfeit paper money, embodying the invention; and it will be understood that this device .is also adapted to detect counterfeit signatures and the like, as will be evident. This device includes a casing I I which is longitudinally vertically split at I2 to provide a plurality of sep- 30 arate casing sections I3 and I4. These may be suitably interconnected as by bolts I5 to provide a rigid structure. As thus arranged, the casing I I affords a top chamber IB dened by front and rear walls I1, I8 respectively, side Walls I9, 20 respectively, and a forwardly downwardly sloping top wall 2I. The lower part of the casing II may be considered as providing a base 22, adapted to be closed by a plate 23 which may be removably secured thereto by screws, or which may removably snap into the rabbet 24 marginally formed in the base. The forward part of the latter may project frontward as at 25, so that a table or other support 26 may lead invward therefrom, in parallel relation to the top wall 2|. Formed in the side walls I9, 20, along the plane of the table 26, are slots 2'I which extend inward from a transverse entrance slot 28 in the front wall I'I, up to a point 29 at which the slots 21 terminate in tapered form to releas- 50 ably clamp or snugly engage a bill, as hereinafter more fully described. It will now be perceived that by splitting the casing II, as well as the table 26, along the plane at I2, a very simple structure is afforded, which is adapted to be eas 55 ily molded, and which, except for the plate 23, may consist of only two parts, namely, the casing sections I3, I4. It will be appreciated that the easing II may be made of any other size, shape, structure or arrangement.

Journaled in the walls I9, 20 is a shaft 30 carrying a turntable or polygonal rotor 3| aflixed thereto, having any number of faces, but being desirably in the form of an equilateral triangle in cross section, so that bills in 5, 10 and 20 dollar' denominations may be easily angularly applied to said faces as hereinafter described. Aflixed to the shaft 3l) externally of the casing II is a polygonal indicator 32, in this case triangular, and bearing numerals at 33 corresponding to the denominations of the bills on the turntable 3|, it being understood that the faces of the latter and of the indicator are alined to correspond with each other. A head 34 may be affixed to the indicator or to the shaft 30 for causing rotation. To set the device against accidental movement, the indicator 32 may have on its inner face a rigid tit or projection 35 located adjacent to a corner of the triangle, and adapted to engage in any one of three recesses 36 formed in the outer face of the side wall I9, to hold the turntable in any one of its three operative positions. For a resilient snap engagement of the tit 35 in the recesses 36, an expansion coil spring 31 may extend around the shaft 3l) and bear against the side wall I9 and an end of the turntable to thus actuate the longitudinally movable shaft 30 to pull the indicator 32 against the wall I9, whereby the engagement at 35, 36 will operate releasably in a well known manner. If desired, longitudinal movement of the shaft 3B may be limited in any well known manner.

Formed in the top wall 2l of the casing II is an opening 38 provided in the mating casing sections I3, I4, said opening affording an annular seat for a magnifying accurately ground and highly polished lens 39 that may be suitably secured as by a bezel 40. This acnromatic objective lens is of sufficiently large diameter to embrace in its field the upper face of the turn table 3I and a substantial area of the fixed table 26, and yet to afford relatively high magnification at a small focal distance, whereby the device I0 may be kept small and compact.

A source of light, such as an electric lamp 4I may have its base 42 mounted on a support which may include bracket arms 43 formed for this purpose on the individual casing sections I3, I4. The lamp may be located along the center plane of the casing II, and a refiector 44 therefor may extend the full width of the casing II and may be suitably aixed to the rear wall I8. The arrangement is such that the lamp and reflector are adapted to project light with substantially equal intensity upon the upper face of the turntable 3l and upon the fixed table 26, and yet to lie rearward out of the field of vision of the lens 39.

Il desired, a switching device may be provided for automaticallycausing the lamp 4I to light when a bill such as 45 is inserted for comparison, and to cause the lamp to be deenergized when the bill is withdrawn. For a reason hereinafter indicated, the bill is longitudinally folded adjacent to one edge, as at 46, and this fold which is of greater stiffness than the rest of the bill, may be utilized to cause counterclockwise swinging motion of a bell crank lever 41, about its pin or shaft 48 that is afxed to the side wall I9. A

move the latter clockwise.

light, tension coil spring 49 is affixed at 50 to the side wall I9 and is connected to the lever 41 to The other arm 5I of the bell crank lever is adapted to engage a spring contact 52 aiiixed to the side wall I9. The circuit to the lamp may include a lead 53 entering the casing I I through a hole, with one wire 54 of the lead being directly connected to the lamp base, and the other wire 55 being connected to the bell crank lever preferably adjacent to its axis. A wire 56 may connect the contact 52 with the lamp base. By arranging the bell crank lever and its switch adjacent to a side wall of the casing, there is no obstruction in applying bills to the faces of the turntable 3|. Since the fixed table 26 may end short of the ends of the slots 21, this table may act as a stop to limit movement of the lever 41 under tension of the spring 49.

I have found that it is desirable in detecting counterfeit money to make the comparison principally with the head or picture of a person that is always carried by paper money. Hence I arrange the bills that are to be mounted on the turntable 3I by folding each bill several times, into small, compact and thin form so as to leave the head fully exposed. It is naturally desirable to maintain the bills intact and also to permit their easy removal at night when the place of business is closed. Hence I provide channel elements 51 extending along the ends of each face of the turntable, each element being closed at one end to form a stop, for which reason these elements may be of U-sliaped form, so that there is a longitudinally extending channel element 53 on each face of the turntable. It will now be seen that the folded genuine bills above described, denoted by the numerals 59, may be slid in place to be each marginally held down on three edges by the channel elements referred to. By providing a turntable of triangular form, each of l these folded bills can be easily inserted and relnoved at a large obtuse angle when the device I0 is inverted and the plate 23 removed.

It will be noted that the arrangement is such that the fold edge 49 ol the bill 45 cornes directly against an adjacent edge of any one of the bills 59, to obtain maximum proximity, and that the tapered slot portions at 29 not only form stops for the bill 45 but snugly hold the sam-e down on the table 26. In order that the exposed faces of the bills 45, 59 lie in a single plane for accurate comparison through the lens 39, the turntable 3l may be of such size as to allow for the thickness of the folded bills 59. It will be understood that the fold 46 in the bill 45 is so located that the heads on the bills 45 and 59 are in direct juxtaposition.

Since each denomination of paper money carries its individual head, the observer is bound to note a bill whose amount has been raised.

The manner of using the device Il! will now be described. The operator folds known genuine bills as described and applies them to the turntable faces to correspond with the numerals at 33. He then secures the plate 23 in position and the device I0 is ready for use. A bill that is submitted is longitudinally folded as hereinbefore described, and is inserted in the slots 21 as far as it will go. Thus the bell crank lever 41 is operated to close the circuit to the lamp 4I. Now the operator looks through the lens 39 and instantly detects the slightest discrepancies. If inspection of any other part of the bill 45 is desired, the same may be slid transversely of the table and viewed through the lens 39, while the lamp is lit. The device I0 may be made so small, that it can be mounted on a cash register so as to be unnoticed by a customer. It may be made larger for banks, and may be arranged for inspection of a larger portion of the bill as desired.

I claim:

1. A device for detecting counterfeit bills, including a casing providing a chamber, a polygonal turntable rotatable about its horizontal axis and presenting on its different faces comparison indicia for bills of different denominations, the casing having means for supporting a bill in the chamber including slots along a plane that coincides with the plane of an upper face of the turntable, said slots extending along the front and side Walls of the casing for the insertion of a bill Whose ends project outside of said chamber, means for rotating the turntable, a source of light in the casing, and a magnifying lens on the casing embracing in its field of vision the upper face of the turntable and a portion of the chamber adjacent thereto for a direct comparison of the bill with said indicia, the slots in the side walls having tapered end portions for snugly clampingly engaging a bill inserted thereinto.

2. A device for detecting counterfeit bills, including a casing providing a chamber, a polygonal turntable rotatable about its horizontal axis and presenting on its different faces comparison indicia for bills of different denominations, the casing having means for supporting a bill in the chamber including slots along a plane that coincides with the plane of an upper face of the turntable, said slots extending along the front and side walls of the casing for the insertion of a bill whose ends project outside of said chamber, means for rotating the turntable, a source of light in the casing, and a magnifying lens on the casing embracing in its eld of vision the upper face of the turntable and a portion of the chamber adjacent thereto for a direct comparison of the bill with said indicia, a polygonal head outside of the casing being connected to the turntable, the faces ol` said head being alined with those of the turntable, and indicia on the faces of the head corresponding to the indicia on the faces of the turntable,

3. A device for detecting counterfeit money, including a casing providing a chamber, a turntable in said chamber for mounting different comparison indicia, said chamber having a slot opening for insertion of a bill, means within said chamber for mounting the bill inserted in said slot, a source of light in the chamber for illuminating the turntable and, said bill mounting means, and a single magnifying lens mounted on a wall of the chamber and embracing within its eld of vision the turntable and a portion of the bill mounting means for direct magnified comparison of the bill with said indicia, the bill mounting means including a table integral with the casing, the latter being longitudinally vertically split through the lens opening and the table and providing two casing sections, each having a portion of the slot opening, and means for connecting together said casing sections.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2920524 *Oct 25, 1954Jan 12, 1960Smith Kline French LabInspection device
US2976719 *Oct 23, 1956Mar 28, 1961Donald RushmorePaper contamination classifier
US2995976 *Jan 30, 1957Aug 15, 1961Universal Controls IncInspection and projection device
US3203308 *Nov 9, 1960Aug 31, 1965Edwin F BaileyMicroscope fabric comparison apparatus
US3767305 *Nov 9, 1972Oct 23, 1973Electro Photo Syst IncRetro-reflex viewer for detecting counterfeit identity cards
US3774046 *Jun 25, 1972Nov 20, 1973Hirsch WCounterfeit currency detector
US3842281 *Feb 5, 1973Oct 15, 1974Goodrich RCounterfeit document detector
US5668377 *Mar 27, 1996Sep 16, 1997Erickson; WinPoint of sale counterfeit detection apparatus
US6637577 *Aug 9, 2001Oct 28, 2003Chieh OuyangBanknote scope
US6714288 *May 4, 2001Mar 30, 2004Roy CohenCounterfeit detection apparatus
US20020163633 *May 4, 2001Nov 7, 2002Roy CohenCounterfeit detection apparatus
U.S. Classification356/71, 200/52.00R, 209/534
International ClassificationG07D7/00
Cooperative ClassificationG07D7/00
European ClassificationG07D7/00