US1993464A

US1993464A - Spurious coin detector for slot machines

Info

Publication number: US1993464A
Application number: US604477A
Authority: US
Inventors: Cecil H Underwood
Original assignee: Individual
Current assignee: Individual
Priority date: 1932-04-11
Filing date: 1932-04-11
Publication date: 1935-03-05
Anticipated expiration: 1952-03-05

Description

March 5, C, UNDEWOOD 1,993,464

SPURIOUS COIN DETECTOR FOR SLOT MACHINES INI/ENTOR. i Eig- 5.; @ogy/@HAMM @Wamwv March 5, 1935- c. H* UNDERwooD SPURIOUS COIN DETECTOR FOR SLOT MACHINES 5 Sheets-Sheet 2 Filed April 11, 1932 INVENTOR.

March 5, 1935. c. H. UNDERWQOD 1,993,464

SPURIOUS COIN DETECTOR FOR SLOT MACHINES Filed April 11, 1952 3 Sheets-Sheet 3 INVENTOR.

UNiTED STATES PATENT OFFICE SPURIOUS COIN DETECTOR FOR SLOT MACHINES Cecil H. Underwood, Oakland, Calif. Application April 11, 1932, Serial No. 604,477

This invention is a spurious coin detector and has reference to a device forming an auxiliary Various methods and devices have been employed and incorpo? rated in slot machines for discarding spurious elements but in all cases they have been complicated, expensive tov construct, and in actual practice have very little utility and usually are not part of a coin operated device.

26 Claims.

eifective in accomplishing the result desired.

This device has reference to a method and means by which spurious coins are retained in an element in which the coin is visible and will not tend to pass through into the slot machine, and any variation in size, ccecient of rolling friction or sliding friction, speciiic gravity or weight, will prevent operation of the device and the spurious element will remain in sight'where'an attendant can readily detect the insertion of it.

This device must be loaded with a standard element or coin to make it operable and then each inserted standard coin or element thereafter will operate the slot machine by means of the previouslyy inserted coin, the last inserted coin always remaining in the detector until the next coin is inserted.

This device may readily be incorporated in any slot machine, though it is preferred to have it as an individual unit which is mounted in proper registry with a slot in a slot machine and which may be readily removed and rep-laced. This, oi course, may be performed in a variety of ways, depending on the type of slot machine and slot opening, and would preferably be locked in position.

The main object of the invention, therefore, is to provide a spurious coin detector for slot inachines in which the coins are visible for a period of time from the insertion thereof until the insertion of the next following coin.

Another object of the invention is to provide a device of the character outlined which may be applied to existing slot machines or incorporated` in their structure.

A further object of the invention is to provide a device of the character outlined which is simple in construction, has no moving parts, and may be made' suitable for any size or type of coin.

A still further object of the invention is to provide a device of the character outlined which will prevent the operation of the slot machine by an element which is not ofthe same size and. weight or which has a different coeicient of friction even if the weight is the same, than the standard element.

Other objects and advantages of the invention will become apparentes the following description is read on the drawings forming a part of the specication and in which similar reference characters are used to indicate similar parts throughout the several views, of which:

Fig. 1 is an inside view of the invention showing a standard coin in position and ready for operation, the door being o'pen andthe device registering over the slot of a slot machine.

Fig..2 is a view similar to Fig. 1 except indicating aspurious element which has been inserted and which due to not having a true circular periphery has been trapped therein.

Fig. 3 is a closed view of the device showing a spurious element of identical size but different weight and its effect.

Fig. 4 is a view similar to Fig. 3` except a stand-Y ard element has been inserted and therefore has driven the previous element over the ridge to pass into the slot machine.

' Fig. 5 is a modification of the invention showing externally operated means for stopping the primary coin or slug.

Fig. 6 is'a plan view of the invention showing the locking means.

Fig. 7 is a section takenon line 7-7 of Fig. 4.

Fig. 8 indicates the diiference in form of track required where different coins are used.

The invention consists of a casing lO'having a slot 11 formed at the top and a discharge slot 12 at the bottom terminating in a slot housing receiving recess 13. The rearward end of the housing `is provided with hinge eyes 14. An opening 15 is provided with a pane of glass 16 which is mounted in the recess 17.

The inside of the housing is further recessed as at 18 to receive the

track plates

19 and 20, which are suitably secured therein by means of screws 21. A recess is provided at 22 to receive the ear 23 of the receiver 24, and which is hingedly connected by means of a screw 25.

Hingedly mounted on the hinge eyes 14 is a door 26, the top and

front surfaces

27 and 28 of which register with the top 29 and front 30 of the frame when the door is closed. The door is provided with a pane of glass 31 whereby the interior of the device is made visible for the detection of spurious coins. Y Y

v The receiver 24 is provided with

ears

32 and 33 which'span the housing together with the closed door, and thereby lock the door in closed position, the door being opened by first swinging to its original position as shown in the views. A suitable lock 34 is provided for locking the receiver to the housing so that the device can not be opened except by the use of a key.

The slot 35 is made of the correct size to receive the standard coin or slug and therefore will receive a spurious element which has one diameter equal to the diameter of the standard element. However, as this element is dropped through the slot and rollsv about the track 36, the larger diameter will engage transversely in the track as indicated by the washer 37, and though the track and the slot are of the same width, a coin may be inserted in the slot and yet will be stopped in the track, this being one of the particular functions of the device. Many of these spurious elements are found in standard slot machines as well as those having spurious coin rejectors as the spurious element can be inserted in the slot and after once inserted it will pass through into the machine while in this device it will be stopped in the track and retained in Visual position.

The distance between the two glass Windows 16 and 31 provides a space 38 just suflicient to clear the standard coin or slug to be used so that an element of greater thickness will not pass through. The slot has a height just suflicient to clear the standard insert and is provided with an inclined surface 39 which is suicient to ensure the coin rolling along its surface and an upward incline at 40 of just sufficient height previous to discharge into the discharge slot l2 to permit the impact of the following inserted element, (if of standard size and weight), to drive the first inserted element over the top and yet being of sufficient height to prevent the second inserted element from going thereover, thereby causing it to drop back into the lowest portion of this slot. It will be noted that these inclines and curves must naturally be varied for different sizes and weights of operating elements or coins, as the larger and heavier the coin, the greater its inertia and consequently the higher the point 41 would necessarily have to be.

Fig. 8 indicates the same track made fora larger coin, the track being adaptable for use in the same housing, the previous illustrations being directed to the standard United States nickel.

In Fig. 5 is shown a modification in which manual control means is provided for stopping the rstinserted element and releasable to permit the inserted element to pass out of the guideway. This means comprises a pin 43, which is pivoted at 44 to the lever 45, which in turn is pivoted at 46 and projects from the rear of the housing to provide an operating handle 47. By actuating the handle 47, the inserted coin is released and the pin will return to position to intercept the next inserted element. A suitable spring is provided to force the pin 43 downwardly. In another form of the invention, a lever 54 is pivoted at 55 adjacent the end 4l in such manner that the shorter arm of the lever manually projects into the path of travel of the coin as it approaches the delivery end of the guideway. The said upwardly projecting shorter portion will serve to interrupt the travel of the coin until the next coin strikes it, whereupon the lever will be tilted sufficiently to discharge the first coin and to bring the longer arm of the lever into the path of movement of the next coin in time to arrest the travel thereof. As the iirst coin is dislodged, the second coin moves up to the position previously occupied by the other coin so that the heavier end of the lever 54 may drop and bring the shorter end up to position to arrest said second coin at the discharge end of the guideway.

The device is used in the following manner:

Where the device is not provided with the stop element 42 the receiver 24 is unlocked by means of the key operated in keyhole 48 and the receiver is swung forward about its pivot 25. This releases the door 26 which may be swung open and a nickel 49 is inserted in and is normally retained in the position shown in Fig. 1. The door 26 is then closed, the receiver 24 swung back intoposition and locked, which places the device in condition for operation. Where the stop element`42 is used, it is merely necessary to press down on lever 47, drop the nickel through the slot 35, which is stopped by the stop 42 and rolls back to the position shown in Fig. 1.

The next nickel dropped into the slot rolls along the track 39 about the edge 50 and by itsy inertia, drives the preceeding nickel 49 into the discharge slot 12 from which it enters the receiver 51 of the slot machine, the following nickel being indicated at 52 in Fig. 4. The inclination and height of the track at 41 is made just sufcient so that the following nickel 52 will stop before it passes over the edge 41 and will then roll back to the position'shown by the dotted lines 53 in Fig. 4 which is the same position as that held bythe previous nickel 49.

In the event that an element such as a washer or slug 37 should have one diameter that would pass through slot 35, the other diameter being too great, the slug would roll along the track until the greater diameter was transverse of the track and would become wedged or trapped as shown in Fig. 2. It would obviously be necessary to unlock and open the door to remove this slug but it would readily be indicated through the windows.

Should an element of the same diameter as the standard element but of less weight as that indicated at 49, be inserted, the inertia would be insufiicient to drive the element 49 over the edge 41 as shown in Fig. 3, and the two elements would remain as is shown in this gure and the slot machine would not be operated. In this case it would again be obviously necessary to open the device to remove this spurious element. Should the inserted element be of substantially the same size and weight as the standard element but have an entirely different coeilicient of friction, the result might resolve itself into either of two cases, in the rst, the coefficient of friction either rolling or sliding or both, may be greater in which event suiiicient momentum would not be obtained by the following element to drive the standard element over the point 4l and, second, if the coefficient of friction were less, the second element would pass over the edge 41 along with the iirst and which would immediately be detected by the attendant. However, the possibility of any spurious element being used having a lesser coefficient of friction is very remote as rthe usual machine generally uses nickels or other smooth coins while the general run or" spurious elements consists or stamped iron washers, stamped slugs made of brass or iron, both of which have a higher coeicient of friction due to rough surfaces and the metals employed.

It will be noted that this device will stop operation of the slot machine when any spurious element which Ahas not the exact weight 'and diameter'of the standard element,fis'used and also that a spurious element of the same size and weight but having a different coefficient of friction will also not operate the slot machine but will be trapped in this device.

It will further be noted that variations in concomprising a housing havingv a circuitous path v for a coinand a coin retaining depression'and provided with means to be actuated at will for retaining a iirst coin in a visual position and adapted to permit forwarding the rst coin to the slot machine by impact of a second coin.

2. A spurious coin detector for slot machines comprising a housing having a circuitous path for a coin and communicating at its opposite ends with a receiving slot and a discharge slot and provided with an upwardly inclined portionadjacent the discharge slot, whereby a first coin is retained adjacent the discharge slot andadapted to Vbe forwarded to the discharge'slot by impact of a following coin of similar size and weight, and means to'be actuated at will for stopping the first coin in the depression.

3. A spurious coin detector for slot machines comprising a housing having means therein providing a visible path for guiding coins, said path having an inlet slot and a discharge end, said path also having an upwardly inclined portion adjacent its'discharge end so constructed and arranged as to arrest the-travel of a slug of legitimate weight and dimensions and to temporarily retain it in a stationary position by gravity, and in such manner that it will -be dislodged by a fol-'- lowing slug of legitimate Weight and dimensions as it travels toward said-discharge end, an intermediate portion of the path-forming'means being so constructed and arranged as to entrap a non-circular slug of illegitimate dimensions but having a minor diameter which will permit it to enter said inlet slot.

4. A spurious coin detectorcomprising a casing having a coin receiving slot and a coin discharge slot, said slots being located inv vertical planes, and a coin path in angular relation to, and communicating with the slots, said path having a coin retaining depression adjacent the discharge slot, said path beingso'formed, whereby, when a first coin is at rest in said depression, a second coin of similar weight and size, when inserted in the receiving slot, will attain the proper momentum so that impactwith the first coin will forward the iirst coin to the discharge slot and cause the second or following coinY to return to the original position of rest of the first coin.

5. Ak spurious coin detector comprising a cas-` ing having a Coin receiving slot andY a coin discharge slot, said slots being located-in vertical planes, and a coin path in angular relation to, and communicating with the slots, said path having a coin retaining depression adjacent the disand cause the second or following coin to return to the original position fof rest vof the first coin, said path being of `substantially' `U form, the upper and lower legs terminating at 'the receivingand discharge slots and being respectively lobtusely related to the receiving slot andacu'tely related and communicatingl with the-slots, said path having acoin retainingV depression adjacent 'the discharge slot, said path being so formed, Vwhereby, when a vfirst coin is at rest said depression, a second coin of similar weight and size, 'when inserted in the receiving slot, will attain the proper momentum so that impact with'the 'first coin will forward the first coin to the discharge slot and cause the-second or following Vcoin 'to return to the original position o'flrest ofthe first coin, said casing consisting of a housing" and a door hingedly connected thereto, and a coin receiver hinged to the housing and provided lwith means for securing the door in closed position when the receiver is moved to its operative'position, and means for locking the receiver inj'its operative position againstv movement aboutv its hinge joint to coincidently lock the door.

7. A spurious coin detector comprising a casing having a coin receiving slot and a coin discharge slot, said'slots being located in vertical planes, anda coin path in angular relationY to', and communicating with the slots, said path having a coin retaining depression adjacent the discharge slot, said path being so formed, whereby, when a rst coin is at rest in said depression, a second coin of similariweight and size, when inserted in the receiving slot;y willY attain the proper momentum so that impact with the first coin will forward'the first coin to thedischarge slot and cause the second or following coin to return to the original position of rest of the'rst coin, said path being of substantially U form, the upper and lower legs terminating at the receiving and discharge slots and being respectively obtusely related to the receiving slot and acutely related to'the discharge slot, said casing'consisting of a housing and a door hingedly connected thereto, and a coin receiver hinged tothe housing 'and Vprovided with means for securing the door in closed' position when the receiver is moved to its operative position, and means Yfor locking the receiver in its operativeA position against movement about its hinge joint`to coincidently` lock the door.` f Y `8. A spurious coin detector comprising a casing having a coin receiving slot and a coin discharge slot, said slots being located in vertical planes, and Va coin path in angular relation toand communicating with the slots, said vpath' having a coin retaining depression adjacent the discharge slot, said path being so formed, whereby,l when a rst coinl is at rest in said depression, a second coinof similar Weight and size, when inserted in the receiving slot, will attain the proper momentum so that impact with the firstcoin will forward the iirst coin to the discharge slot and cause'the second or following coin to return to the original positionof rest ofthe first coin, and' stop means automaticallyi actuated by the forwarded' coin to prevent the second coin from vfollowing the iii-st coin into the discharge slot.

`v9. A Vspurious coin detector comprising a casing having av coin receiving 'slot and a' coin' dis--Y kcharge slot, said slots beingflocatedinA vertical planes, and a coin path Vin angular relation to, and communicating with the slots, said path having a coin retaining d epression adjacent the discharge slot, said path being so formed, whereby, when a rst coin isv at rest in Asaid depression, a second coin of similar weight and size, when inserted in the receiving slot, will attain the proper momentum so that impact with .the first coin will forward the first coin to the discharge slot and cause the second or following coin to 4return to theoriginal position of rest of therst coin, and stop means automatically actuated by the forwarded coin toprevent thesecond coin from following the first coin into the discharge slot, said casing consisting of ahousing and a door hingedly connected thereto, and a coin receiver Y hinged to the housingand provided with means for securing the door. in closed position when the receiver is moved to its operative position, and means for locking the-receiver in its operative position against movement ,about its hinge joint to coincidently lock the door; 1;

10. Aspurious coin detector comprising a casing having a coin receiving slot and a coin discharge slot, said slots being located in vertical planesand a coin pathin angular relation to, and communicating with the slots, said path having a c oin retaining depression adjacent the discharge slot, said path being so formedfwhereby, when a first coin isat rest in said depression, a second coin of `similar weight and size, when inserted in the receiving slot, will attain the proper momentum so that impact with the first coin will forward the first coin to the discharge slot and cause the second or following coin to return to the original position of rest of the first coin, andstop means actuated at will for stopping the first coin inserted, to retain the first coin in the depression for loading the machine.

1l. A spurious coin detector comprisinga casing having a Vcoin receiving slot and a coin discharge slot, said slots being located in vertical planes, and a coinpath in angular relation to, and communicating with -the slots, vsaid path having a coin lretaining depression adjacent the dischargeA slot, said path beingrso formed, whereby, when-a first coin is at rest in said depression, a second coin of similar weight and size, when inserted in the receiving slot, will attain the proper momentum vso that impact with the first coin will forward the first coin to the discharge slot and cause the second or following coin to return to-the original position of rest of the first coin, said path being of substantially U form, the upper and lower legs terminating at the receiving and discharge slots and being respectively obtusely related to the receiving slot and acutely related to the discharge slot, and stop means actuated at will'for stopping the first coin inserted, to retain the -first coin in the depression for loading the machine. v y

Y12. A spurious coin-detector comprising al casing having a coin receiving slot and a coin discharge slot, said slots being located in vertical planes, and a coin path in angular relation to, and communicating with the slots, said path having a coin retaining depression adjacent the discharge slot, said path being so formed, whereby, when a first coin isyat rest in saiddepression, a second coin of similar `weight and size, when inserted, in the receiving slot, will attain the proper momentum so that impact with the first coin,will forward the first coin to the discharge slot and cause the second or following coin to return to the original positionV of rest of the first coin, said casing consisting of a` housing and a door hingedly connected thereto, and a coin receiver hinged to the housing andl provided with means for securing the door in closedrposition when the receiver is moved to its` operative position, and means for locking the receiver in its operative position against movement about its hinge joint to coincidently lock the door, and stop means actuated at will for stopping the first coin inserted, to retain the first coin in the depression for loading the machine.

13. A spurious coin detector comprising a casing having a coin receiving slot and a coin discharge slot, said slots being located in vertical planes, and a coin path in angular relation to, and communicating with the slots, said path having a coin retaining depression adjacent the discharge slot, said path being so formed, whereby, Vwhen a first coin is at rest in said depression, a second coin of similar weight and size, when inserted in the receiving slot, will attain the proper momentum so that impact with the first coin willV forward the first coin to thedischarge slot and cause the second or following coin to return to the original position of rest of the first coin, and stop means automatically actuated by the forwarded coin to prevent the second coin from following the first coin into the discharge slot, and stop means actuated at'will for stopping the first coin inserted, to retain the first coin in the depression for loading the machine.

14. A spurious coin detector comprising a casing having a coin receiving slot and a coin discharge slot, saidV slots being located in vertical planes, and a coin path in angular relation to, and communicating with the slots, said path having a coin retaining depression adjacent the discharge slot, said path being so formed, whereby, when a first coin is at rest in said depression, a second coin of similar weight and size, when inserted' in the receiving slot, will attain the proper momentum so that impact with the `first coin will forward the first coin to the discharge slot and cause the second or following coin to return to the original position of rest of the first coin, and stop means automatically actuated by the forwarded coin Ato prevent the second coin from following the first coin into the discharge slot, said casing consisting of a housing and a door hingedly connected thereto, and a coin receiver hinged to the housing and provided with means for securing the door in closed position when the receiver is moved to its operative position, and means for locking the receiver in its operative position against movement about its hinge joint ,to -coincidently lock the door, and stop means actuated at will for stopping the first coin inserted, to retain'the firstfcoin in the depression for loading the machine.

15. A spurious coin detector comprising a rectangular casing having one side, a door hinged to the casing and forming the other side of the casing, a coin-receiver-housing receiving recess formed in the underside of said casing adapted to fit over the coin receiverof a slot machine, a discharge slot communicating with the recess, a coin trackplate interposed between the one side of the housing and the door, the oneside of the housing and the door each being provided with a,` transparent wall whereby the trackplate is vis- I ible throughout its extent, a coin path formed in said trackplate and terminating` at its opposite ends in a receiving slot and a discharge slot, said path having a depression formed adjacent the discharge slot for gravitationally retaining a first,

coin, said first coin being forwarded to thefdischarge slot by the impact of a second coin Vof equal or greater weight, and means for stopping the second coin after impact to prevent the second coin from following the first coin directly to the discharge slot, second coins of less weight than the first coin having insuiiicient energy to forward the rst coin and being retained in visible position within the path with the first coin.`

16. A spurious coin detector comprising a rectangularcasing having one side,.a door hinged to the casing and forming they other side ofthe casing, a coin-receiver-housing.,receiving recess charge slot for gravitationallyretaining a iirst.

coin, said iirst coin being forwarded to the discharge slot by the impact of a second coin of equal' or greater Weight, and means for stopping the second coin after impact to prevent the second coin from following the first coin directly to the discharge slot, second coins of less weight than the iirst coin having insufficient energy to forward the iirst coin and beingretained in visible position within the path with the first coin, and stop means actuated at will for stopping the first coin inserted, to retainthe first coin in the depression.

for loading the machine.

1'7. A spurious coin detector comprising .a rec.- tangular casing having one'side, a door hinged to the casingandforming the other side of the casing, a coin-receiver-housing receiving recess formed in the underside of said casing adapted to iit over the coin receiver of a slotrmachine, a discharge slot communicating with the recess, a coin trackplate interposed between the one side of the housing and the door, the one side of the housing'and the door. each being provided with a transparent wall whereby the trackplate is visible throughout its extent, a coin path'formed in said trackplate vand terminating at its opposite ends in a receiving slot and a discharge slot, said path having a depression yformed adjacent the discharge slot for gravitationally retaininga first coin, said first coin being forwarded to the dis-r charge slot by the impact of a second coin of equal .or greater weight, and means for stopping the second coin after impact to prevent thesecond coinfrom following the iirst coin directly to the discharge slot, second coins of vless weight than the first coin having insufficient energy to forward the first coin and being retained in visible position within the path with the vfirst coin, said path being of substantially U form, the upper and lower legs terminating at the receiving anddischarge slots and being respectivelyob-H formed in the undersidev of said casing adapted to fit over the coin receiver of a slot machine, adischarge slot communicating with the recess, a coin trackplate interposed between the one side of the housing and the door, the one side of the 'housing and the door each being provided with a transparent wall whereby .the trackplate is visible throughout its extent, ak coin path formed in said trackplate and 'terminating at its opposite ends in a receiving slot and a discharge slot, said path having a depression formed adjacent the 'discharge slot for gravitationallyretaining a first coin, said first coin being forwarded to the dischargeslot by the impact of a second coin of equal or greater weight, and means for stopping the second Ycoin after impact to prevent the second coin from following the iirst coin directly tothe discharge slot, second coins of less weight than the .first coin having insufficient venergy to forward the rst coin and being retained in visible position within the path with the rst coin, said path being of substantially U form, the upper and lower legs terminating at the receiving and discharge slots and being respectively obtusely related to the receiving slot and acutely related to the dischargeV slot, and stop ymeans actuated at will for stopping the first coin inserted, to re-Y tainthe iirst coin in the depression for loading Y the. machine.

19. A spurious coin detector comprising a rectangular casing having Vone side, a door hinged to the casing and forming the other sideof the casing, a coin-receiver-housing receiving recess formed in the underside of said casing adapted to fit over the coin receiver of a slot machine, a discharge slot communicating with the recess, a coin trackplate interposed between the one side of the housing and the door, the onel side of the housing and the door each being provided with a transparent wall whereby the trackplate. is .visible throughout its extenta coin path formed in said;

trackplate and terminating at its opposite ends in a receiving slot and a discharge slot, said path having .a depression formed adjacent the discharge slot for gravitationally retaining a first coin, said first coin being forwarded to the discharge slotby thel impact of a second fcoin of equal or greater weight, and means for stopping the second coin after impact to prevent the kseciond coin fromfollowing the iirstcoindirectly to the discharge slot, second coins Vof less'weight than the first coin having insufficient energy toV forward the first coin and being retainedin visible position within the path with the first coin, and

tangular lcasing, having one side, a door hingedto the casing and forming the other side-of the casingLa coin-receiver-housing receiving recessV formed in Ythe underside ofsaid casing adaptedr to fit over the coin receiver of a slot machine, a

discharge slot ,communicatingwith the recess, a,

coin trackplate interposed between the one side ofthe housing and the door, the one side of the housing and the door each being provided with;

a transparent wall whereby the trackplate is vis-v ible throughout itsextent, a coin path formed in said trackplate and terminating atits opposite ends inra receiving slot and a discharge slot, said path having a depression formed adjacent the discharge slot for gravtationally retaining a first coin, said rfirst coin being, forwardedtothe discharge slot by the impact of a second coin of equal or greater weight, and means for stoppingy the second coin after impact to preventY the second coin from followingthe first coin directly to the discharge slot, second coins of less weight than the first coin having insufficient energy tor forward the first coin and being retained in visible position within the path with the first coin, and stop means actuated at will for stopping the first coin inserted, to retain the first coin in the depression for loading the machine, and a receiver hinged to the housing and having means for'securing the door in closed position, and means for locking the receiver in operative position, coincidently locking the door.

21. A spurious coin detector comprising a rectangular casing having one side, a door hinged to the casing and forming the other side of the casing, a coin-receiver-housing receiving recess formed in the underside of said casing adapted to fit over the coin receiver of a slot machine, a discharge slot communicating with the recess, a coin trackplate interposed between c the one side of the housing and the door, the one side of the housing and the door each being provided with a transparent wall whereby the trackplate is visible throughout its extent, a coin path formed in said trackplate and terminating at its opposite ends in a receiving slot and a discharge slot,

said path having a depression formed adjacent the discharge slot for gravitationally retaining a first coin, said first coin being forwarded to the discharge slot by the impact of a second coin of equal or greater weight, and means for stopping the second coin after impact to prevent the second coin from following the first coin directly to the discharge slot, second coins of less weight than the first coin having insuicient energy to forward the first coin and being retained in visible position within the path with the first coin, said path being of substantially U form, the upper and lower legs terminating at the receiving and discharge slots and being respectively obtusely related to the receiving slot and acutely related to the discharge slot, and a receiver hinged to the housing and having means for securing the doorV in closed position, and means for locking the receiver in operative position, coincidently locking the door.

22. A spurious coin detector comprising a rectangular casing having one side, a door hinged to the casing and forming the other side of the casing, a coin-receiver-housing receiving recess formed in the underside of said casing adapted to fit over the coin receiver of a slot machine, a discharge slot communicating with the recess,v a coin trackplate interposed between the one side of the housing and the door, the one side of the housing and the door each being provided with a transparent wall whereby the, trackplate is visible throughout its extent, a coin path formed in said trackplate and terminating at its opposite ends in a receiving slot and a discharge slot, said path having adepression formed adjacent the discharge slot for gravitationally retaining a first coin, said first coin being forwarded to the discharge slot by the impact of a second coin of equal or greater weight, and means for stopping the second coin after impact to prevent the second coin from following the first coin directly to the discharge slot, second coins of less weight than the first coin having insuihcient energy to forward the first coin and being retained in visible position within the path with the first coin, said path being of substantially U form, the upper and lower legs terminating at the receiving and discharge slots and being respectively obtusely related to the receiving slot and acutely related to the discharge slot, and stop means actuated at will for stopping the first coin inserted, to retain the first coin in the depression for loading the machine, and a receiver hinged to the housing and having means for securing the door in closedv position, and means for locking the receiver in operative position, coincidently locking the door.

23. A spurious coin detector comprising a rectangular casing having one side, a door hinged to the casing and forming the other side of the casing, a coin-receiver-housing receiving recess formed in the underside of said casing adapted to fit over the coin receiver of a slct machine, a discharge slot communicating with the recess, a coin trackplate interposed between the one side of the housing and the door, the one side of the housing and the door each being provided with a transparent wall whereby the trackplate is visible throughout its extent, a coin path formed insaid trackplate and terminatingfat its opposite ends in a receiving slot and a discharge slot, said path having a depression formed adjacent the discharge slot for gravitationally retaining a rst coin, said first coin being forwarded to the discharge slot by the impact 'of a second coin of equalor greater weight, and means for stopping the second coin after impact to prevent the second coin from following the first coin directly to the discharge slot, second coins of less weight than the first coin having insufiicient energy to forward the rst Y coin and being retained in visible position within the path with the first coin, and a receiver hinged to the housing and having means for securing the door in closed position, and means for locking the receiver in operative position, coincidently locking the door, said receiver having a slot registering with the receiving slot when in its operative position, the means for securing the door in closed position consistingof downwardly projecting ears on opposite sides of the receiver lspanning the casing and the door to prevent separation thereof.

24. A spurious coin detector comprising a rectangular casing having one side, aldoor hinged to the casing and forming the other side of the casing, a coin-receiver-housing receiving recess formed in the underside of said casing adapted to lfit over the coin receiver of a slot machine, a.

discharge slot communicating with the recess, a coin trackplate interposed between the one side of the housing and the door, the one side of the housing and the door each being provided with a transparent wall whereby the trackplate is visible throughout its extent, a coin path formed in said trackplate and terminating at its opposite ends in a receiving slot and a discharge slot, said path having a depression formed adjacent the discharge slot for gravitationally retaining a first coin, said first coin being forwardedv to the discharge slot by the impact of a second coin of equal or greater weight, and means for stopping the second coin after impact to preventV the second coin from following'the first coin directly to the discharge slot, second coins Vof less weight than the rst coin havingY insufcient energy to forward thefirst coin and being retained in visible position within the path with the first coin, and stop means actuated at will for stopping the first coin inserted, to retain the first coin in the depression for loading the machinepand a receiverhinged to the housing and having means for'securing the door in closed posi#- tion, and means for locking the receiver in operative position, coincidently locking the door, said receiver having a slot registering with the receiving slot when in its operative position, the means for securing the door in closed position consisting of downwardly projecting ears on opposite sides of the receiver spanning the casing and the door to prevent separation thereof.

25. A spurious coin detector comprising a rectangular casing having one side, a door hinged to the casing and forming the other side of the casing, a coin-receiver-housing receiving recess formed in the underside of said casing adapted to fit over the coin receiver of a slot machine, a discharge slot communicating with the recess, a coin trackplate interposed between the one side of the housing and the door, the one side of the housing and the door each being provided with a transparent wall whereby the trackplate is visible throughout its extent, a coin path formed in said trackplate and terminating at its opposite ends in a receiving slot and a discharge slot, saidpath having a depression formed adjacent the discharge slot for gravitationally retaining a rst coin, said first coin being forwarded to the discharge slot by the impact of a second coin of equal or greater weight, and means for stopping the second coin after impact to prevent the second coin from following the iirst coin directly to the discharge slot, second coins of less weight'than the' first coin having insufficient energy to forward the first coin and being retained in visible position within the path with the first coin, said path being of substantially U form, the upper and lower legs terminating at the receiving and discharge slots and being respectively` obtusely related to the receiving slot and acutely related to the discharge slot, and a receiver hinged to the housing and having means for securing the door in closed position, and means for locking the receiver in operative position, 'coincidently Ylocking the door, said receiver having a slot registering with the receiving slot when in its operative position, the means for securing the door in closed position consisting of downwardly projecting ears on opposite sides of the receiver spanning the casing and the door to prevent separation thereof.

26. A spurious coin detectorv comprising a rectangular casing having one side, a door hinged to the casing and forming the otherv side of the casing, a coin-receiver-housing receiving recess formed in the underside of said casing adapted to fit over the coin receiver of a slot machine, a discharge slot communicating with the recess, a coin trackplate interposed between the one side of the housing and the door, the one side of the housing and the door each being provided with a transparent wall whereby the trackplate is visible throughout its extent, a coin path formed in said trackplate and terminating at its opposite ends in a receiving slot and a discharge slot, said path having a depression formed adjacent the discharge slot for gravitationally retaining a first coin, said first coin being forwarded to the discharge slot by the impact of a second coin of equal or greater weight, and means for stopping the second coin after impact to prevent the second coin from following the first coin directly to the discharge slot, second coins of less weight than the rst coin having insufficient energy to forward the rst coin and being retained in visible position within the path with the first coin, said path being of substantially U form, the'upper and lower legs terminating at the receiving and discharge slots and being respectively obtusely related to the receiving slot and acutely related to the discharge slot, and stop means actuated at will for stopping the iirst coin inserted, to retain the first coin in the depression for loading the machine, and a receiver hinged to the housing and having means for securing the door in closed position, and means for locking the receiver in operatve position, coincidently locking the door, said receiver having a slot registering with the receiving slot when in its operative position, the

`means for securing the door in closed position consisting of downwardly projecting ears on opposite sides of the receiver spanning the casing and the door to prevent separation thereof.

CECIL H. UNDERWOOD.