US1645353A - Signal system - Google Patents

Description

Oct. `1'1, 1927.

- 1,645,353 E. E. SALISBURY SIGNAL SYSTEM Filed Jan. 24, 1925 3 Sheets-Sheet 1 Oct- 11 1927' E. E. SALISBURY SIGNAL SYSTEM 1925 3 Sheets-Shaml 2 Filed J'an 24 SIGNAL SYSTEM Filed Jan. 24, 1925 5 sheets-sheet 3 Patented Get. 11, 1927.

lillttll STATES PATENT Fllll.

EDGAR E. SALSBURY,

SIGNAL Application filed January rlhis invention relates to a signal system, and more particularly to a system of automatic control lor patrolmens movements, in which system is provided means tor causing an automatic alarm at some selected station, as a. police station, Within aipredetermined time, and in a predetermined order, atler failure of the patrolman or patrolmen to properly operate any station box on his beat or route, and also upon any interruption to the circuit in which such boxes areplaced.

To this end the principal object of my invention, broadly considered, is to provide a series oic patrolmens boites designed and electrically connected in such manner that when operated in accordance with a prearranged schedule no record is made ot the progress oi the patrolman or patrolmen from station to station, or ot the time or times any one or more patrolmen report at the several stations', but when not operated in accordance with the schedule, will automatically give an alarm or cause a signal to appear in a central station.

Another broad object ot my invention is to provide a means, in such a system, to give an alarm or signal upon any interruption to or closing of the circuit in which such boxes are placed, depending upon Whether a closed or open circuit is used.

ianother object of my invention is to provide a station box and automatic supervisor tor a system of the kind rei'erred to, each of Which is a unitary mechanism and, consequently, which may be shipped ready assembled Without chance of loss or displacement of the component parts thereof.

A further object ot my invention is to provide a series ot' electrically connected station bones in Which only one or more selected boxes may be operated attlie same time.

Still another object ot my invention is to pro vide an automatic supervisor for such a system comprising an electro-mechanical attachment tor an ordinary clock movement, and constructed in such manner that Will not cause an alarm or give a signal when the system is functioning normally and properly operated.

There are many other objects ot' the invention which Will appear from the following more detailed description thereof when considered in connection With the accompanyingdrawings which have been chosen to illustrate the saine, and in Which:

OF CHICAGO, ILLINOIS.

SYSTEM.

24, 1925. Serial No. 4,547.

Fig. l is a schematic vievv of the system, showing diagrammatically the details ol structure ot' the automatic supervisor;

Fig. 2 is a front elevation of a station box designed *for use on a closed circuit with the cover removed, shov-.ring a part ot' the internal mechanism in elevation and set in oper ative` position for a patrolmans visit;

Fig. 3 is a section taken along the line 33 of Fig. 2;

Fig. e is an end elevation of the box illus trated in F ig. 2;

Fig. 5 is a View similar to Figp, but showing a station boi; desiO'ned for use on an open circuit;

Fig. 6 is a side elevation of the trated in Fig. 5; Y

`Fig. 7 is an end elevation ot the box illustrated in Fig. 5;

Fig. 8 is a side elevation oi the pulley mechanism of the supervisor; and

Fig. 9 is a Wiring diagram illustrating the manner of connecting a series ot" open circuit patrolmens boxes in an open circuit.

It. is desirable t'or public authorities, owners of factories and large ot'llce buildings, and other persons Who employ patrolmen or Watchmen, to determine Whether or not the latter are performing their duties, and many mechanical and electrical systems have been devised With this end in View. In all oit them, however', in so tar as applicant is aware, it is necessary for the watchman to turn in an alarm at some central station from different points or stations on his route. `When such an alarm is turned in, a record of that fact is made, together `With the time it is received, and in this Way the progress of the Watchman or patrolman from station to station is checked.

The present invention obviates the necessity o'f checking patrolmen at a central station When they are functioning emciently and While the system is in `good Working order. In a general Way this object is attained by providing station route boxes ot a novel design at specified locations on the street or throughout a factory, tor example, and having the patrolinan operate the same in a predetermined order in accordance With a time schedule. It the boxes are operated in accordance With such schedule no alarm or signal of any kind is made. On the other hand, if the patrolman neglects or fails to operate any box on time, or if for any reason izo the device getspoutiot order, as wheii a line S bi'ekeniaelmm elisir-,nel iii-llaa ally be turned in at the central lsta trically connected in the system, whereupon an appropriate investigation may inode.

lll/ith these purposes andnobjects in `iniiid I have conceived and devised the structural idetails andarrangeinentojt 4parts illustrated by the" acconipaiiyiiigi` drawings. Referring now to, such drawings,I and particularly to the details of structure and. arrangement ot l parts thereof by. reference characters ,or numerals, in which like characters oriiiiinerzils `desigiiate likeA parts, andinore especially to Fig'. tthereo't, theiteiierence, character A b wires throuoh asourceoit electrical energy D, to an automatic. supervisor; E, .the Hsysteinbeina t ing devicesM, as elec-.trici ills, are connected grounded `at T.f. Two signalto the supervisor through a source of electrical,energy ,.asibywires a, andA such` bells are grounded at X. 1 v have lillustratedf-two ,types of station boxes A, one designed toi-.ilse onaii open `circuit ,and .the other on. a .closed circuit.

Either may `be used Vas desired yo iwheii. local conditions reduire.4

The closed Circuit boX ilhistrated'by.

2 and?) is these-nie iiiccons'ituctionlas .all ,boxes used ina closed circuit system.. vThis V35, having` a cani surface which is adapted .to slide overthe said pins..

box consistent acase 1 in which is. mounted .an. electro-inagnetl 2.0i?- ordinary` construction-.. The, cores ot this magnet. attract. an armature 3,..whichisinountedon a yflange ota slidinaplatetas.bylineaiis otscrews .6, althoughthe armature and plate inaybe made integral itydesired. The4 plate .tis

. mounted. .in grooves on A.the .outer eiidsfot guides Sand. 8@ which guidesiextend through and are. iiiedin the h acklo'l" `the `case 21.... For

. vthis purpose. the` plate. is provided .with slots f, engaging-.said grooves. A Astud k9 is iixed in the 4back ot: the case 1 `and extends throughand,beyondiafslot 9...inthe center of plate 4l, as .by means otscrews 15, isan angle release `arm 16,. thegfree i end y .17 ,oit which .ex-

tends upwardly along and spaced,` from .the said plate,iaiid-sucli end is. providedwitlra forwardly extending; projection `1S.

instable setscrew 19 is passed through a stud M 21, fixediininediately under the slidineplate An; ad-

4l' ,for limiting the. ,downward movement The control wheel 22 above'inentioiied A.spacedpins 25.

. ciprocation ot the plate. This arrangement isknown iutheliorological art as a pinwheel escape inoveiiient, and inay be replaced designates patrolinenis route station boxes (three being shown) electricallyconnected `is provided witha series,otcircuniterentially .arrangedf .fQr'inirdly.. .projecting i. equal 1y This wheel is rotatably and Xedly mounted on the stud 9, in the groove 10, by'any suitable -iiieans, as by a sci-ew i1 and washer 12. ri"he pins 25 are fixed in the"p'e`.riphery ot the flange 26 of the contro'lwheel Z'Zlpwhicli wheel is provided with a hollow forwardly Vprojecting annular flange 27,. on which isiixedly mounted a disc QS; `awls 31, are mounted on, the front side taces ofthe platetto alternately engage inv the present invention by 4any otherinechanical ,nioif'einent y.whereby the control wheel [22 iii-ay `be actuated ,by the `sliding` f" .platel--` For exainple, a toothed wheel inay be substituted for the pin wheel @Zand eiigagged bythe pawls 31.

A series of aperturesBQ 'are drilled.

through and. around the periphery of ,the

(M5028, and vdetachable. lifting pins 38 are .inserted therein for apurpose to be pres .ently slated... These.aperturesinay or, may not. be vequally spaced, as desired.

. Ani angular. lock` lever 34 is, pivotally `mounted, as. by ,ineans of pivot pin 38., in the case, in suchinannerthat the end ot .one arm thereof inay engagethe pins For this purpose `.such end. is provided. with a 'linger 4and adaptedto engage aforwardly extend- 4ing.propection 39 ony an angular control lever 41, .which vwill now be described.

The Vcontrol lever 41 is pivoted on thepivot pin. 12in such nianner that. one ariii thereot will extend under the disc 28 andthrough an .opening inthe side of the Vcase 1(i.nthe con .struction shown .in Fig'. 2) ,l and ,terininate .inside ofthe casein theeonstruction shown..

by Fig. 5..; The v.othere iid, 4e3 ot' this lever yis providedwith a spring; Contact arin fiel,

which isniounted on an insulation 4.5,.t`iiied onthe said.4 arin. Ordinarily. `the `control havingthe free end thereof. passed .underxa lug 1.0011 .the said. lever.. i

A binding post 46 is positioned on the case l lever isheld in a raised position by ineans of. .a spring @f1-coiled.around thestud 42 and 1 under. the contactarin and. electrically i.

connected. thereto by ineaiis of a. coiled wire if and .to the inaincircuit 4through the inediiiin of the insulated, wirel. Adjacentthe said postwar-n adjustable screw 4 8, functioning as a. Contact post for the arin 44, is provided. rthis screw is electrically connected, by ineans tion a three-station route is disclosed.

mounted on a sha'lt 57. A slip collar 58, provided ith contact friction springs 53),

59', on the ends thereof, is splined on the shaift 57. This collar is provided at a point intermediate its ends with a groove in which a slidable yoke 6l is mounted.

There is also loosely mounted on the :hatt 5T, at the ends ot the collar 58, two grooved pulleys 62, 62. rlhese pulleys are positioned by collars 63 fixed on the shaft. Each pulley is provided with a weight 66, which is connected thereto by means ot a cord,-

tieible wire, chain, or other securing device 6T, one end of the same being secured to the pulley. i tell-tale Contact arm 68 is secured to each pulley in such position that a sutilcient rotation of the same will bring` the. said arm into contact with a lug 69 on the end ot and insulated trom an arm 70, which arm is adjustably mounted on the shaft bearing. rlhe lug 69 is electrically connected, through a source ot electric energy l), by means ot the wires a, to an ordinary electric bell or buzzer M, which is grounded at X, in the circuit Selected to illustrate my invention.

The yoke 6l, above mentioned, constitutes one end of a lever 7l, which is pivoted, by means ot a pin 72, intermediate its ends. One end ot a link T3 is plvoted, by a pin 74, to the tree end ot the lever 71, the opposite end ot said link being pivoted at to the end ot au armature 7e ot' an electro-magnet 'T6 in the main circuit ot the system. The opposite end of the armature Til is piyoted by means orn a pin TT. Adjustable screws 750 are provided tor holding the armature Til in halt-way or neutral position.

lt will be understood that the parts or' the devices herein disclosed are properly insulated wherever necessary, and'that a suitable bonv or framework is provided tor my supervisor, a speciiic description ot the details ot structure of the saine being` considered unnecessary tor the purposes of this speciiication.

For the purpose ot illustrating my invenln operation ot such a route the flexible cords 67 (Fig. l) are unwound and the tell-tale contact arms 68 adjusted with respect to the arms 69. The pulley 62 is rotated to a position such that the said arm 68 will rotate to a point adjacent but not touching the contact lug 69, and then return to normal position through the automatic reversal of the pulley when the station boxes are operated at the proper time. y

To effect this result we may suppose that the boxes are set tor operation at one hour intervals in the order they appear in the circuit, although they may be set tor operation at any interval ot time and need not be operated in the order above stated, and that the iirst bor; is to be operated at two oclock. :it one oclock, ior example, which will be` indicated by the clock mechanism (not shown) connected to the sha'jt 54, the cord 6T (letthand side ot Fig. l) is unwound, as illustrated, and the movable contact lug 69 and pulley 62 are set as shown by Fig. l, and the contact vitriction spring 59 on the splined collar 58 is caused to engage the said pulley, the friction spring 59 on theoppositev end ot said collar being out orn contact with its corresponding` pulley.

rlliereupon movement of the clock mechanism begins, which causes the shaft 5ft tcrotate. The rotation of this shaft in turn rotates the gears 55, 56, shaft 5T, collar 58, and pulley 62. As this pulley revolves it slowly winds up the cord 67, and raises the weight 66 and, at the same time, brings the contact arm 68 thereon in increasingly closer relation with the lug 69. y

fitter an hour has passed, viZ:-at two oclock, tor example, the tirst route. bor; is operated; that is to say, the main line circuit .is momentarily interrupted, as will later appear. Immediately upon the opening ot the circuit the electro-magnet 76 is demagnetized, whereupon the spring Tel raises the armature 74e and shitts the collar 58 through means orn the link 73 and lever 7l. rlhereupon the weight 66 will drop by gravity, causing the cord 67 to be unwound and the Contact arm 68 returned to normal or rero position.

In the event, however, that the first, or any other box in the system, is not operated on time, the armature 7st will be held in the position illustrated by Fig. l, and the clock mechanism will bring the arm 68 into contact withl the insulated lug 69 after a predetermined interval ot' time, say tive minutes. lnasmuch as this lug is electrically connected to an electrical bell M, or other signaling device, located in a central station, it will be seen that an alarm or signal will then be given.

The pulley 62 is'constructed and connected to a signaling device, as the one previously described. This pulley, however, is always out Ot contact with the spring 59 so long as the main circuit is unbroken. But should such circuit become'interrupted for any reason, the armature Tl would be released through the demagnetization ot the electro-magnet 76, whereupon the collar 58 would shift the said spring 59 into trictional engagement with the said pulley, and

"towel" Syetenrand when eef deed; l

deemed Unnecessary present p lte'te'riing'now totheopeiicirci tbe 'and the [proj ec 'circuit'eyetein` 'Normally `the artnetiii-'e ently described.`

Lthe clockl lne'ehanisn'iL we ii'ldceuee' the afin 68 thereon to Contact With its Corresponding" lng after a predetermined time and' thereby give an alarm, ae previously described. Wifhen 'so Shil'ted Vthe Contact spring 59 would be "dieengaged from' the corresponding pulley. l'

lt 'qbe desiredlto hold the cen'taet springs 59, 59', ont et' 'contakt itliboth' pulleys in "order tgperinit `he cloel-nieclianein to operate without eaiieingthe enpervie to' tunetion, the" screifzs 75O`1na`y be' adjueted toho'ld the arin'atiire Til inniidwayposition, which in turn wlll'shit the splinedcol'lai '58in neutral poeition;`

"Further, I desiieit to" be understood that although "Thavedescribed 'my anton ie siiperyieor connected witlifan' electricbell,

the latter ie connected inem-neotheieignaling Syetein; foi'eiainple,"it"niay` `be 'einployedin connection' witlia railiiay watch els'iipf viso1``woulcl be connected to' the L 'ein hereinbe'ore` described and setv oil' an" alarin when the Lttnyernian`didnot operate anapcircuitat "predetermined" time`VA1` Bilbo, if desired, only one 'det'ice'fin'ajyfbe connected to the supervisor to indicati-i'4 e1 ber an' interruption" to "the c'irciiit or 'iipon `til- '1`i`i'e""of"anyonefto operate a"` rlh i cha'nfave` 'lie fwithin "the Skill 'of'a nieclianic, aiiddeci'ipt "1 etliictute on ne e" neceeeary to ornpheli the!" agee are gpoees.

system, it will be noted frein inspection oit" Fig'. lhat niyhopen 'circuit Station 'route box is'the Ine" 1n conetri'ictiona'e tlie'one "ptevoiielyl'deecribethexcept that the Contact poet 48 electrically connectedtoftlie inain circiit, byineane ofa wire' g, andlhat y io1r39"`on the"` kcontrol' leiter 'extende throiigl'i'aii openingl in' the ifi'font of the trae-ey lfto Serveasfan' operating"'liandle, the` lende" et" the leve ll being` 'on "the" inside of the bebe ln' Fi `9 'l liay "the manner olf sonnet ing; these boee in an open 7G', l andV wires Z Vand A 7i 'back "to the said" elec- `troeine.,fgnetz The n'iagnetization of the elect'rofniagnet TG attracts 'the armature "Telf and efnzil to'be ,is yen, as will be pres4 `j Referring" to the tliee-tation"route 'eloeed oii'euitmbox Shown in'yFigjS. 23, the first box setas `illustrated."Tl1at 1S to say,

the armature 3 and Sliding,` 'plate 4 being iraisedmiid" the cainfaceon on`"ei1d of the 35 linger' "being` in engagement with one ot Vthe lifting pineI *These pinsare inserted engagement witlith'e projection 18cm' the release arm 16.

L pa'trolman 1nay\ 1iow depress the projeetingpendot the operating'lever," which 75 demaguetizee the electro-magnet 2' by break- 1 the inain 'circuit'thronghtle separation jo'l'tlieepring contactarnii Maand Contact screw 18. Thereup'onwtlre slidingplate 4 drops"tl1rough"the `torce of `gravity, which 80 a pin on thecontrol"wheel 22 and partially rotates the sa'inefThe rotation 'of this wheel Causes the disc "23,S mounted thereon, toY also revolve and the 'cani' Jaceo'n'the linger 35 to 55 contiene to ride onthe prn 33 oneaid. dise.

'Simultaneously' :'tlieiewirtli, 'the circuit 'bei-ng broken, the n1agnetY6"('Fig; l) is demagnet ized and" the weight 66 (left-hand eide of the hilaire) drops, as "previously" described. 90 Upon releasing the control' leverY all the 'Spring flwreturns the saine to normal po- 'Siti'oin closes tl'1eco1'1tarct `between thespring arin letand'screw contz'ict post 48," where" upon'tlieV electro-magnet '2 reinagnetiZe-d 95 and attracteiie 'armature and :thus causes Inblfeinent ofthis' plate' ceases the lowerinoet pawl 3l toengage another pin on the 'conf' 'trol wliee'l 22 anc'ipartially rotat'etlieeanie. 100A the disc to, revolv'eand t-hecaml face on the finger of 'lock "lever to ridecompletely overfthe pin y331,"whereby*the said linger drops ."behji'nd vthe 'eaidipin' andin' 'front of 105 Athenext faydJaeenthole and"'permitsA the projection on'the endo'f eaiddeye'r to lock under the projection 39 onthe Control leiter.

Frein what has 'been saidit will Abe noted that a complete reciproeati'onoffthe plate 110 #lf causee the' Cain 'face on ithle linger '35 yto ride over andi p ast a pinv 33 'when the `mechanism-iseet a's"illi1strated l'by' Fig'. 2 *of the clrawi11gs."Two ineiie complete recip- 'rocatione ofthe plate' will'bringthe Said 115 cani surface 'into Contact iiith Athe nextv vadjacentpin when two holes' arel left between adjacent" pairspt' pins, as previously 1nen. tioned. y

"lli the three-Station"route 'boxes are' to 120 be operated'one after theothei "as 'they are p'laced'fin vtheline or circitftlie"disc :in

`the third`stat`ion boxwill'be set-,'juet before the lii"st"box ie operated, so that the' finger n 35 willlbe in' frontot' a"pin,'a`nd the linger 125 in the" 'second let-ation' boxz `will Abe between "twoh'ole'sl 'lnasinuch as" thel depression of any oneoperatng'leyer opens` the circuit,y

all of the magnets in all of the boxes will be simultaneously demagnetized. Consequently a depression and release of any operating lever will cause the simultaneous operation of the mechanism in all boxes, which includes, of course, the simultaneous rotation of all discs.

The lifting pins in the discs being arranged and the mechanism in the boxes set` as specified, it will be seen that at the time the first box is to be operated the other two are loclred by the interlocking of theiprojections 37 and 39. The complete operation of the first box locks itself, unlocks the second, and leaves the third locled; andthe operation of the second box loclrs itself, leaves the first locked, and unlocks the third,

Vand so on for the number of boxes used in the system. rllherefore, in any event the said boxes must be operated in a predetermined order.

Although the foregoing description relates particularly to a closed circuit system, my invention may also be used in connection ith anopen circuit by initially raising the armature '74 (Fig. 9) and setting the mechanism in all patrol boxes as illustrated by Fig. 5, and the discs as previously described, that is yto say, with the spring contact arm la out of contact with the adjustable contact post 118, whereupon the magnets 2 will be demagnetiaed and the sliding` plate 4l- 1n lowered position.

ln a system of this kind, viz: an open circuit system, the Contact friction spring 59 l) will ordinarily be in engagement with the pulley 62', and the signaling device associated therewith used to indicate the failure of a watchman to report at and operate any box within a specified time after the time schedule, or upon failure of the box system for any reason. The other signaling device will be used to indicate a closing of the circuit by accidental or other means. Otherwise the devicesfunction and operate as the closed circuit mechanism described.

Vi'hile I hare shown my invention as used in connection with three-station route boxes, and described the same as adapted to be operated in the order in which they .are placed in the circuit, I desire it to be distinctly understood that this arrangement and use of the invention includes the use of any number of such boxes and is not limited to the operation of the boxes in the order stated, since all boxes, and each of. them, regardless of number, may be set for operation at any predetermined time or times. It will further be understood that my automatic supervisor is adapted to set in operation any signaling mechanism, regardless of whether the latter is used in some other signaling system. For example, it may be used to set 1n operation a device in an ordinary police signal system to give an alarm or signal.

2.111 a signaling system, a central station, signal means within said station, a plurality'of patrol boxes, means for electrically connecting said boxes whereby they can be operated only in a predetermined order, and means for operating said signal at a Apredetermined time after said Vconnection becomes inoperative.

8. In an electrical circuit, the combination of ay plurality of patrol, boxes and a signal mechanism, said boxes comprising means for setting each box for operation within a predetermined time after the operation of the preceding box, means comprising a winding mechanism and an electro-magnet encrgized by the operation of said boxes for rendering the same inoperative to produce a signal. when the said box is operated on time.

Ll. In an electrical circuit, the combination of a plurality of patrol boxes and a signal mechanism, said boxes comprising means including discs having Ipins therein for setting the same for operation within different predetermined times and lthe said mechanism comprising means for rendering the same inoperative when the said boxes are operated on time.

5. In an. electrical cir-cuit, `the combina.- tion of a plurality of patrol boxes and a signal mechanism, the said boxes comprising means for setting the same for operation within different predetermined times and the said mechanism comprising means including weights and pulleys for rendering the same inoperative when the said boxes are operated on time.

6. In station patrol mechanism, the combination with an yelectro-magnet, of an armature, and means including winding mechanism, associated with said armature for automatically setting the said mechanism for operation within a predetermined time.

7. In a station patrol mechanism, the combination with an electro-magnet, of an armature, and means associated therewith for automatically setting' said mechanism for operationwithin a predetermined time,

.ia I

the said means including a disc having pins projecting laterally therefrom. x

8. In a station patrol mechanism, the combination VWith an `electroj-niagnet, of an armature on a sliding plate, andlmeans as "sociated wit-lisaid armature `for settingthe same for operation Within a predetermined time, `the said means including a disc having pins projectingtheiefroin, and means ,for locking the said mechanism in inoperative position.

9. The combination in ay station'patrol mechanism, of `an electro-magnet, an arma- Yture toi said' magnet, the said armature being on a sliding plate, a disc having pins projecting therefrom, vmeans for' operatively connecting the saidplate andthe said disc,

a'levei having a; cam surface on one en'd thereof for riding over the `said pins,` and f p means for locking the said' mechanism.

10In a supervisor for a system of the kind herein disclosed, the combinationwith an electro-magnet, ci a signaling device,

`and means including Winding mechanism,

associated ivitli said device for normally rendering the sameinoperative ivhen said electro-magnet is energized.

Il'. Iii a signaling mechanism, the coinbination ot a pulley having a. flexible cord and Contact arm thereon, a WeightV on said` cord, a shaft for said'pulley, a splined colL lar on said" shaft for engaging said pulley,

means including an electro-magnet asso-V ciated with; said' collar for throwing the same into and out of engagement with said pulley, a signa-ling device, and electricalV connections between' said arm and device and for saidineans whereby Ythe saidfmechanisin is rendered operable. n

12. A signal system comprising a plurality. of' patrol boxes and an automatic signaling device,`electrical means connecting said boxes; and device, and means" whereby said boxes when operatedmustbe operated in a predetermined order, but may be operated at any time Within a predetermined ingenteY period after the operation of the Ypreceding n box:

13. In a'signal system, an automatic signal device, supervisor mechanism for controlling the operation ot saiddevice, means for operatingsaid device when said mechanism is notl operated'within a predeterininedil time after its preceding operation, a plu-4 rality of patrol boxes, means tor operating said mechanism when any one of said boxes `is operated, and means tor preventing the operation of said boxesexcept in a predetermined order, butpermittingany box.

to be'opeiatedy at any tiineivithin aV predetermined period atter the operation'otthe preceding boxr for preventing the operation oi' said signal device. f

141 In a signal system, a signal device, a

plurality otpatrol" boxes, means for automaticallt7 operating said device When any one'ot saidboxes is not operatedWit-hin a vpredetermined time after the opera-tion otv the preceding box, and means'vfor prevent-l ing the opera-tion ot said boxes except in a predeterininedv` order, but permitting any box to be operatedrat any time Within a predetermined period a't'ter the operation of the preceding box` for preventing the operation otsaid signal device. I

l5. In asignal system, a signal deviceT supervisorfmechanism adapted: to be reset for preventing the Voperation oit said device,4

supervisor is not reset after a predetermined time afterA theY operation vof the box last .operated Inftesti'inonywhereof I aiiix ,my signature. p i f i Encina n; simisennr.

CERTFICATE 0F CORRECTRUN.

Patent No, i,645,353. Granted October 1i, i927, to

EDGAR E. SAMSBURY.

eers in ehe Ii is hereby certified that error epA printed specification oi the quiring ooiiecion as foil above numbered patent re ows: Page 5', line 23, claim 6, after the word "said" insei the Word "pnirolm and that the said Letters Paent shonid be read with this correction iiierein i:

hat the same may conform to the record of the casse in the Patent iiioe.

Signed and sealed this ist dey ef November, A. D. 1927.

M. J., Moore, Seel. Acting Commissioner of Patents.

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