US2669335A - Coin control and change apparatus - Google Patents

Description

ll lfl mll wnrlllltwfllllrllllfirllz 4 Sheets-Sheet l 8. MAY 1 COIN CONTROL AND CHANGE APPARATUS Feb. 16, 1954 Filed June 11, 1945 Feb. 16, 1954 s. MAY 2,669,335

COIN CONTROL AND CHANGE. APPARATUS Filed June 11, 1945 4 Sheets-Sheet 2 7 Feb. 16, 1954 5. MAY 2,669,335

com CONTROL AND CHANGE APPARATUS Filed June 11, 1945 4 Sheets-Sheet s 93 .9 7 79c i 7651 96 /75 78 1.4 :I

A 7 TI 1 -122. 74 *I A 77 1 H L: x 79; H 7

Feb. 16; 1954 5, MAY

COIN CONTROL AND CHANGE APPARATUS Filed June 11, 1945 4 Sheets-Sheet 4 Patented Feb. 16, 1954 2,669,335 COIN CONTROL AND CHANGE APPARATUS Sam May, Chicago, Ill. Raymond '1. Mol

, assignor of one-half to oney, Chicago, Ill.

Application June 11, 1945, Serial No. 598,832

10 Claims.

in conjunction with coin-operated vending and dispensing machines, the novel control means operating to return the change of a coin exceeding in value that required to actuate the vending or among other things.

More specifically, it is an object of the invention to provide coin-control apparatus suited for use with known types of coin testing apparatus, and which by reason of its structural and functional peculiarities, obstructs the practice of certain kinds of fraud to which machines of this class are vulnerable.

Further objects are the provision of coin control means of general application and especially suited for use testing chute; which the accepted coin lodges and actuates cer- Which is of a rugged and relatively simple character, structurally and functionally, whereby it is capable of rapid, accurate operation over long periods Fig. 2 is a vertical section, to enlarged scale, through the coin control unit, viewed along lines 2-2 of Fig. 1;

Fig. 3 is a side elevation of the coin apparatus of Fig. 1 viewed from its opposite side;

Fig. 4 is a vertical sectional detail along lines 4'--fl of Fig. 3 showing the fraud preventive coin trough;

Fig. 5 is a side elevation of the circuit control unit;

Fig. 6 is a front Fig. 5;

Fig. 7 is a front elevational detail of the change payout control switch on the unit of Fig. 5 looking in the direction of lines '!-1 of the latter;

elevation of the unit shown in anisms employed.

The long-established the vertical-drop or gravity type of coin testing I coin-testing devices are used; and where a change-return means is employed, the seriousness of the fraud problem is greatly amplified.

The present invention provides coin-handling means and cooperating circuit control tuated by a coin-testing that access of defrauding tools to otherwise vulproper coin, after it has left the a proper coin, if the change-return means is to be operated.

To this end, the apparatus shown in Fig. 1 includes a conventional coin-testing unit ceive coins of three denominations, namely, five For purposes of description, it is suiiicient to point out that all three coins, namely, nickels. dimes, and quarters, are deposited in the chute IS in a passage at the upper left-hand corner as indicated by the coin I8, and the nickels, if

acceptable, issue from the lower right-hand cor- I9, from which they means actrol apparatus, as for example a beverage vending machine. Thus the acceptable coins of lowest denomination, the nickels, are stored in the change-return unit to provide the bank from which change may be made, the unit of sale in this instance being five cents.

Referring now to Fig. 3, coins of ten-cent denomination, issue from the testing chute at its lower left-hand corner (inv Fig. 3), and. pass into a guide 22 by which they are directed into a switch unit 23 to operate a lever arm '24 and close switch contacts 25, 25, 21 and there-- after drop free into a suitable collecting receptacle (not shown). Closure :o'.contacts.;25',-..26;

and 21 will result in operation. of the vending or dispensing apparatus and the change-return. means in a manner hereinafter explained in de-' tail.

Coins of twenty-five cent denomination also issue from the testing chute H3 in the region of its lower left-hand corner (in'Fig. 3) and drop into arspecial fraudpreventive deflector 28 inthe nature of 'a' trough of U-shaped configuration, pitched downwardly, toward the right, and hay-' inga perforate-bottom as at 29,which is not wide enough to permit=the quarter to drop through, but which is otherwise sufficiently open so'thata defrauding probe or 'wireor thelike would pass through,-..wherebiy efforts 'toforce the defrauding probe. or'wire 'tor'foll'ow the channel and passage of theq-uarters is prevented; as will presentlyappear;

The quarters "leave-the end '2 8A of the deflector and drop into a special control chute -33 of the type shown and'claimed -in-myU. S.- Patent No. 2,581,681, issued J anuary'8, 1952'; the general construction-of whichis illustrated in Fig-.- 2, and in cliidesaocoin passage 3tintowhich the quarterdrops and gravitates= past =the-nose 32 r of a firstdog' 33 normally spring-urged to-project said nose-32 into said-passage3l; The dog 33 is car ried on a vertically reciprocable slide 34 "which is normally raised by-spring '3 5 f causing an endipor tion of the dog 33 to bear against the end'3B-of a vertical 'bar 31(see also Fig: 1) fasten the control'chute frame; so th'at'the nose 32 of this-dog is=withdrawn-from the coin passage whenxthe slide-is normally raisedas "by spring*35,' thus'per mitting=the quarter"(indicated") todrop directlyonto the-nose3 ofa'second dog4ll normallyspring-urged intoblockingposition acrossthe coin passage-in thecontrolchute; In this latter or-first position ofthe quarter, the ofisetend'M of switch contact 42 bears against the sideof the coin and is thereby closed against its'companion contact43 to close a-control circuitzior purposes hereinafter "particularly described.

Closure of thecontrol clrcuit'by the quarter in said'first position results; among other things, in

the-'energization of a solenoid 45", Fig.1, having a at Hand 48tothe control pl 'nger" 46 linked as slide 34; so that the latteris moved downwardly against the tension of spring 35, carrying the first dog away from thelower end of bar '31 so that this dog is free to project into the passagei3l (Fig. 2) and-bearagainst the-upperedge-of the" quarter and carry' the'-latter"downwardly with; the descent of'the control unit slide 34 past thesecond dog40, thereby: pivoting the latter dog outwardly against switch contact arm' 50 so that the latter contact closes against" its companion contact 5|, thereby effecting further control operations for the-change-returnmeans as hereinafterdescribed. Thereafter, the quarter leaves the control chute: 30 and passesinto 'a' suitable 4* receptacle (not shown). The coin cannot be retracted so long as the first dog 33 is in the passage; nor after the coin moves past the second dog 40.

Thus, it will appear that acceptable nickels deposited in the coin testing chute operate a switch 2lX in leaving said chute and pass directly into the hopper 20, while dimes operate switch means 24-2 5-2 6-2'| inleaving the: testing chute; and quarters :pass from thetesting, chute into the control unit 30 and operate two switches 42-43 and 50-5|--52 in first and second positions or stations. The switch operated by the nickel will causeoperationof the vending or dispensing machine; theswitchoperated by the dimes will also causeaoperationof the vending or dispensing machine, and in addition, will effect operation of the change-returnmeans to return one nickel; andthe switches actuated by the quarters will likewise cause operation of the vending or dispensing machine, and inaddition, will causethe change-return means to return four nickels by means now to be described.

Referring now to the schematic circuit diagram of Fig. 9, wherein the coin the coin control unit" 30 are shown in outline form, it will be seen that the'nickel switch 21X.

its'terminals 2Iwconnected to a com.-

'or ground Ghwhile the companion has one of mon return contact terminal 2! is connectedpvia junction 60..

to one terminal of an electricallyoperable vendl ing machine; so designated, the remaining ter minal of this vending machine beingconnected to a sourceof power, illustrated'as'a battery, 61 112W.- ing its'return terminal connected to. the common return or ground Gr.

A five-cent IS on its way into the hopper 20 (Fig. 1) will close switch contacts 2 I ,2 la,

frompower source 6|, Fig. 9.

A ten-cent coin or dime would strike the switch-operating lever' 24 (Fig. 3) closing. contacts 25', .26, 21 '(Fig,. 9)

energizing circuit for grounded power supply 6! isclosed to ground through contacts, 25, 26, junction. 62 and junction 60; andin addition the change-return meansis.

passes transiently over the switcheoperating. lever- 24,- the payout. solenoicLor coil will. be imthe attraction of its core.

pulsed once, resulting. in piece 66Iand. theadvance of a. coin-ejecting slide 61 against bottommostcoin or nickel in the. hopper 20 will be customer via a conventional return chute (not illustrated), and the payout slide 61 will be quickly returned by spring payout devices, such as thedevice 20'-64-B6 61'-68, arewelleknown inthe. art, .a form suitable for presentuses Fi l.

Acceptable twenty-five cent coins or quarters.v

willbe delivered from thetesting chute [5. into the control chute 30, wherein the quarter will,

lodge in the first position,.as in .Fig. 2, closing starting switch contacts: 42, 4'3,

testing chute l5 and minor nickel traversingthe chute.

and cause the vending machine or other controlled deviceto be energized Contact 26, isconnected to the common return or ground G-r, so that the.

the vending machine from connected with batteryor,

the normal tension ofspring.[i8,..withv the result that the ejectedlfor. return to the.

68.. Electromagnetic coin.

being shown in elevationin.

which results in. the connection ofground G1" through contact.

43- to contact 42 and via conductor 10 to one terminal H of a motor 12 (Fig. 9), the remaining terminal of this motor being connected to battery or power source 13 grounded at Gr; thus, motor 12 is started, and in consequence the shaft 14, driven through a speed-reduction unit 15 of conventional type, begins to turn slowly carrying with it a toothed switch-operating disc 16 having four equally spaced teeth 16a.

The switch-operating disc 16 is impositively driven with shaft 14 through the agency of a slip-clutch means including a spring 11 com- 18 on the shaft, at one and contact 8%! connecting via conductor 82 to one terminal of the coin-control unit solenoid 45, thus energizing the latter from power source closed by the quarter, as in Fig. 2, into the nd position or station momentarily, the quarter secwherein 34, heretofore described.

A first result of the closing of the second control-unit switch means 50, 52 is the actuation of the vending machine by connection of chine thereby closing tery or power source 6! for the latter. In addithe ground connection through contacts 50,

Energiza-tion of clutch coil 81 attracts a clutch armature 89 against the normal tension of its spring 89a (Fig. 8), thereby withdrawing the oilset end SI of the armature from blocking or restraining position relative to the teeth 92 of another or second toothed disc 93 floating on shaft 14 and driven impositively through friction clutch means including the clutch parts 11 and 19'. heretofore described and more particularly described hereinafter, it being suflicient for purposes of the present description that so long as motor 12 is running, the first disc 16 will rotate and will exert a turning eflort on a third toothed clutch drive so-designattation by blocking or arresting action of the clutch armature part 9|, so that only the first disc 16 rotates when the motor first starts.

As previously stated, initial rotation of the first disc 16 closes switch contacts 86, 8|, causing the coin to be moved to the next position with a consequent closure of the second set of control-unit is withdrawn, and disc 93 as well as its companion disc begin to rotate, and in addition, the clutch armature 89 engages and closes switch contacts iii and I ill, thereby applying a holding ground from Gr via contacts mil, Hll, conductor I82, junction I83 to motor terminal 1|, thereby afiording an operating ground for the latter to replace the starting ground initially applied by the first control-unit contacts 42-t3, since the latter will be quickly opened as soon as the quarter is moved to second position by action of the control-unit slide 34 as aforesaid, thus permitting the motor to continue running.

However, the holding ground through contacts 190, ltll is of brief duration since the clutch coil 81 is only momentarily energized by passage of the quarter into and out of second position in the control unit, and clutch armature 83 is rather quickly released immediately following the freeing of disc til, so that a second holding ground must be applied.

As a result of the operation of the electromagnetic clutch release means, the second and third discs 93 and 95 begin joint rotation, and the third disc 95 is provided with a plurality of teeth 96 exceeding in number those on the second disc, such that there is an interval between sucwith the clutch part 9| to arrest these two discs, four of the teeth 96 on the third disc will. have passed in engagement with contact N5 of a second or quarter payout switch, as a result of which, contact Hi5 will connect ground from Gr through contact I06, conductor I09 and junction H0 to complete an energizing circuit for payout coil 64 from its battery 85, whereby the payout coil will be impulsed once for each tooth 96 permitted to pass into engagement with contact H15 during the interval of rotation permitted disc 93 of the clutch armature 89,

four coins or nickels from the payout hopper 20, so that the change of a quarter will be returned to the customer.

Jointly closed with contacts I05, I06 are contacts I01 and H38, which serve to provide the further holding ground for continued operation of the motor 12 during the payout interval, these contacts serving to connect ground Gr through contact I08, contact m, conductor H2 to junction H3 with conductor I02 leading to motor terminal "H.

A form of motor control unit suitable for use with the aforesaid coin testing and coin control means, is shown in Fig. 5, wherein the motor '12 and speed-reduction means 15 are mounted as acumen-5s a unit on arr-upright bracket plate- I25, through Spring means -fi9anormally holdsthe clutch re- 89in raised-position to project the ofiiset'- end SI thereor'into-the path ofthe lease armatureteeth- 92 =on-disc 93. The first holding switch fonthe motor, including contacts- Hill;- lO-l, is

mounted on" a bracket i2l' on' plate l25"with" the switchblade I disposed to be pressed downwardly-into contactwith' contact blade 1 at when thearmature Eii'is attracted by coil 21. In this view are seen also thetie rod means 91 by which the second disc 9-3 'ispositively coupledrwith the third disc-'95; seealso Fig. 5:

The arrangement on shaft I4,- is seen in Fig. '7, the corresponding switch means W5, W8, lt'l; Hi8 being carried ona bracket 428' secured to the plate liiiwi-th the cammed end of contact blade ltiti'riding the teeth of disc Stand droppinginto the notches between said teeth.

Theifirst disc '26 is viewed endwise in Fig. 6, its switch means 80-, 8| being mountedalso on the bracket I28 with the cammed end portion of bla'de-80 riding in the notch or tooth portions.

Asin'Fig. 5, the clutch spring El presses against a friction-washer of feltor the like, indicated at 18;" which is thereby pressed against the disc 16, there beinganother of these friction washers a on the opposite side of said disc, which in turn is pressedagainstia shortsleeve rat; while.

the latter sleeve presses-against another friction washer TBcurging the latter against disc 95; so that'the latter'tends to rotate with the first disc 16,'and'since the third disc 93 is tied to the second orintermediate discby means 97, the tendency isfor the second and third discs to. rotate with; the normal restraining the first one; however action of clutch parts St -9i prevents such rotationand th'e first Blisenergized: The slip-clutch-means is com pletedby the provision of another friction washer 19d andsleeve lfie'working between'disc 93 andthe hub-portion- 15a of the-speed reduction unit.-

Summary of operation Thesnoyel coin control means is intended to be used with one or anotheraform of coin operated device, suchasa merchandise vending or 'beverage-dispensing machine in which theunit of "sale isapreferably Fig. 9;.th'e.:controlled.instrumentality isdesignated a; vending. machine,

if the nickel'is energizing circuit for powersource B l. As-shown in Fig. 1, the accepted change is made, and

and the dime. is

9).,thereby closing an energizing circuit for the vending machine from power supply, 6 I and also, of the. change-return payout.

65 via the. circuit. hereinbefore. 751:

energizing. coil 64. from power. supply traced. thereby causing the payout slide 67 to second toothed disc -iiI1 is shown of the third disc 95, floatingdisc rotates alone until coil.

but'inotnecessanly five cents.. In-

and this machine. may hie-actuated by deposit of afive-cent coin. or nickel-invthe conventional coin-testingch-ute l5; accepted by chute .15; it :will, gravitater, froma the; latter and. transiently operate. switch-.2 IT-Z'I, a with the sole result .of closing an the vending. machinev from;

be reciprocated" once with -:the result that one five-cent coin is ejected fromthe bottom'of-the 'toforedescrlbed in detail, to clos the starting switch 42-43, which results inenergization of the payout motor with a consequent 12 from its power supply 13, rotation of the first control disc 18 and a closure of switch means tit-8| by;- one of the teeth-ltd, for example, in-consequence of which-thecoin-moving slide 34 (Fig. 2) of coin control'unit 3B is reciprocated once, causing the quarter to be shifted downwardly from its initial position past'the dog and outwardly of the latter. As the quarter engages dog iil in this dog and the latter closes switch contacts 50, 5|, 52. motor-l2 might stop but for the closure of contacts 50-5l-52 almost instantly thereafter, by shifting of the quarter to second position.

Closure of contacts 5E-5 l-52 as aforesaid energizes clutch coil 81, thereby freeing the second j.

disc 93 for rotation thedistance cessive teethtZ, 92a, and contacts Hit-Hi! between two'suc- While the clutch disc 93'ls permitted to travel two successive teeth 92,5241,

the distance between the payout disc 95 will move with it a like distance and four of its teeth 96 will operate the payout switch means Hl5-ls5 four times, causing four energizations of the payout coil 64 with a consequent ejection of four nickels from hopper 2t-for return-to the customer as change forthcquarter. Also, switch contacts HIT-Hi8 will likewise be closed rapidly four times, thereby afford.- ing a further holding circuit for motor 12', it being pointed out that th latter four holding impulses follow in such rapid succession that the.

combined momentum and over-run of the motor.

and speedreduction means assures an apparently uninterupted operation of the motor control unitduring the change-return operation of the payout means i i-451' as aforesaid.

In specifically describing one form of theim vention for illustrative purposes, as aforesaid, it is contemplated that any type of controlled in:

strumentalitymay be substituted for the vendingv machine suggested, such coin-operated devices being of many types and well known in the art, Moreover, it is contemplated thatseparatecoin chutes may be employed for each denomination of coin, in place of the nickel, dime, and quarter.

chute ,l-ti illustrated, and in suchcase, the switch means nickel chute, the switch means 25, 26-, 21 with the dime chute, and the control unit 30 with I the quarter chute, such substitution requiring, no. change in the circuitconnections, the hopper 20. being placed to receive accepted nickelsfrom thenickelchute as illustrated herein.

It is also to be understood that the employ- 28 (Fig. 3) and til 01" the control unit'30" second'position, it pivots the Meanwhile, contact i2-43 have opened and the armature 89 closes to set up a holding circuit]. motor '52 from power supply-13 for the interval during which clutch disc 93 rotates;

Ell -5 l-52 is momentary, so-

'81 is, energized only once,

2l-j-2la would be associated with the,

. '9' ment of battery power sources in Fig. 9 has been resorted to merely to simplify the wiring diavention may be employed. I general, the foregoing detaiied specification is not intended to be limiting excepting as may be expressly provided in the appended claims.

I claim:

1. Coin control apparatus including a coin payout device, motor-driven control means for actuating said device, a coin-control unit for receiving a coin control of said motor control means during said continued operation thereof for operating said payout device a desired number of times.

2. Coin control apparatus control means for receiving a coin and operable movement of said coin into second position as aforesaid for actuating said payout device a certain predetermined number of times.

3. In a coin control apparatus, cooperating instrumentalities including a plurality of rotary means, slip-clutch means providing driving connection between said motor means and said rotary switches, electro-clutch the coin-moving means actuated responsive to movement of said coin into second position for actuating said electroclutch means to free the restrained rotary switch means for operation, said freed rotary switch means thereupon actuating said payout means and a holding circuit for said motor means and operated by said freed rotary switch means to energize said motor for a predetermined time following starting thereof as aforesaid.

i. Coin control apparatus comprising, in com- 10 bination, first and second coin switches; electrically operated transport means for moving a coin from operative engagement with the first coin switch into operative engagement with the payout;

the second coin switch.

5. Coin change apparatus comprising a coin payout; a first named means for actuating said payout; a second named means actuated undernamed means actuated effecting release of said fourth-named means.

whereby to cause operation of the payout by said first-named means; and a sixth means actuated cooperably with said fifth-named means in re-" latter, and also with leasing operation of the said first-named means operation of the latter, for continuing in payout-actuating means including a first coin switch actuated by.

presence of a coin at said first position to initiate operation of said motor switch; means including an electrically releasable brake normally preventing efiective operation of said first switch device of the motor switch notwithstanding thereof by the first coin means including a second initiated operation position for releasing said brake means and thereby causing operation of said first switch .device to actuate the payout; and a normally open carry-over circuit connected for closure to continue the initiated operation of said motor switch, said carry-over circuit including a first carry-over. switch actuated by said brake means to close said circuit contemporaneously with release of said brake means, and a second carryover switch actuated cooperatively with said first switch device to close said carry-over circuit at least once during actuations of the payout.

7. Coin payout means comprising a coin receiver, electrically operated means for moving a coin in said receiver, switch means actuated by presence of a coin at first and second positions in said receiver, electrically actuated coin payout means, a plurality of electrically driven switches, electrical means for driving said last-mentioned by presence of a coin at said first position to initiate operation of said said first-named the. initiated operation of said first-named means a.

comprising a coin,

a com-moving means operated by a coin at said second,

switches, circuit connections effectuated by a coin-in saidreceiver at 'said" first position actuat'-- ingsaid first-mentioned switch means for starting said driving" means, circuit connections effectuated byone of said electrically drivenswi'tches following starting ofthe driving means as aforesaid for actuating said coinmoving means to move saidcoin to-second position, elec-= tri'callyreleasable means normally restraining driving operation of another of said driven switches and released by" circuit connections effeetuated by ooin operation of said switch means' at second position in said' receiver, and circuit connections efiectuated by said other driven switch, released as aforesaid, for actuating said payout means; and holding switch means cooperable with said releasablemeans for con-- tinuingoperation of said driving means a limited time.

8? Coin control apparatus comprising-"a coin payout; electrical" means for" operating saidpay out; electrically driven switch means including a" plurality of pulse switches and motor drivingmeans therefor; electrically releasable holding means normally restraining operation or at least one of saidpu-lse switches bysaid" drivingmeans; coin-operated switches disposed at a plurality of positions; means'for guiding a coin into a first one of said'positionsto operate afirst one of said coin switches thereat; circuit connections effectuated by operation of said first coin switch for initiatingoperation of 'said'driving means to operate a certain pulseswitch; coin-moving means actuated" by said certain" pulse switch for moving a coin from'saidfirst position to a second coin" switch at" a: second" one of said positions; circuit connectionsefi'ectuated by operation of thesecondcoin'switch by a-coinmoved thereto from said first position-for releasingsaid'l'iolding meansto effect operation" of a second one of said pulse switches by said driving means; circuitconnections efiectuated' by operationtof saidsecond pulse switchl released as aforesaid for actuating said payout a first, holding switch means "operatedhy said" releasable means in released condition for maintaininganoperating circuit for. said driving means following release of the releasable means as aforesaid; and a second holding switchmeans cooperable with said second'pulse-switch andactuated during released" pulsing operation thereof for intermittently closing a second holding circuiti'or said driving means for each pulsed operation of said payout.

9. In a, coin control andchange-makingapparatus; a coin transport" device adapted to dispose a" coinat move said coin in' one; direction only from said station pa'st a second'station, a change coin payout'el'ectrically" actuated: motorswitch means and" an operating motor therefor;

first: station to start'the motor'of said motorswitchmeans; a first control'means' actuated by said motor'switchmeans responsive to starting thereofforoperating' said transport to move'a coin a first station and operable'to a starting switch'iactuated'by'a'coin in said transport at the therein to and past a s cond station; asecond controlmean part" of" said" motor switc'h; means" andincluding an electrical releasemeans normally rendering'the same ineffective for actuation by said motor; switch means actuated by'a coin at said second station for actuating said release means-to effect operation of said second control. means-and energizing connections between it: and said payout to operate said payout a determined number of times to payout change; additional circuit meanscontrolled by coin-operation of said second-station switch means for continuing operation of said motor-switch meansaft'erstartingthereof', and' for then stopping said operation' after actuation of the payout said deter-- mined number of times; and vending mechanism actuated by said switch' m'eansat' said second? station. responsive topresence of a coin thereat..

10'. Coin control apparatus comprising an electrically" operated coinxpayout; a. coin: receiver inclu'ding'm'eans' for unidirectionally'guiding a coin into a succession of control positions; a"; coin switch at at least two of said'positions;' electrical ly" operated" coin transport means for moving a 'coinfrom oneto another of said two positions; an electrically drivenland controlled rotary switch device; and circuit connections for said coin switches and said drivenlswitch device'for actuating the latter responsive to presence of a coin operating a coin switch at said one of said two positions; said rotary switch device thereupon actuating said transport 'meansxto' move said" coin to the other of said two positions to operate'the coin, switch thereat and establish a circuitf'or effecting. a further operation of said rotary'swit'ch by" which the latter actuates' said payout;

References Cited in the fil'eof' thispatent- UNITED STATES PATENTS Number Name Date 836946 Schattner' Aug: 13, 1907 1,564 3-83 Varcoe Dec. 8;,1925: 1 587302; Crawford June8;,192 11,6993930 Thompson Jan. 22, 1929 1,748,504 Wurzbach: etal. Feb: 25, 1930 1,896,649- Th'ompson ..Eeb-. '7, 1933 1,9023-67 Robb Mar; 21, I933 2,097,4156 Green Nov. 2, 198-5: 2098310 Williams Nov.t9,,.1937 2,250,05lw Patzer. July 22,1941. 2,262,322 Harris m. Nov. 11, 1941 2 ,323,255' Sutherland .June 29; 1943 2,325,536 Osborne- July" 27,,71943- 2554,8962 Weilere Aug}, 1,1194% 2371413 Fry, -June 5,;1945 2,384,585 Y Alexander t Sept. 11,1945 2,433,689" Dec. 30,1947 2,491,900 Mihalek; s. an"... Dec. .20; 1949 FOREIGN PATENTS Number Country Date 24,125 GreatsBritainsfinwm 19 09" 1 659,251 Germany t Apr. 29', 1938

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