claim as my invention: 1. In a control system for elevators, oper@ able between a plitrallitv of floo"Fs, an elevator car, means for starting said @ar, normally ioo ineffective means for stoppino, said car level with said fl oors, in.cluding inductor relal7 means carried by said car and magnetizabie plates for actuating said inductor relay means mounted adjacent said floors, manually operable call means for said floors and means operable in correspondence with movements of said car for rendering said stopping means effective to stop said car only when said car approacbes a floor for lio which a call means is'operated. 2. In a control system for elevators operable betweer@ a plurality of floors, an elevator car means for start ng said car, normally inei ective mea'ns for stoppin(y said car level with said floors, including inductor relay M eans carried by said car, and magnetizable plates for actuating said inductor relay means mounted adjiicent said floors, mantially operable tip-call means and down-call 120 means for said floors, an d rneans operable in corresponde I nee with the movements of said and - thiis preventin(r car A from receiving -car for rendering said,sto@ping means effeeany f urtlier calls L'W'hile witliin fhe upper tive to stop said car dnly ivhen said car ape I e c; block. At substantially the sanie instant proaches a floor for wbich a a I m ans j. 2 tlic@ br"sli 108' engages the contact segments operated and in the direction corresponding 109' and operates the blocic relay 114'@- for to said operated call means. the car 13, thus placing the car B in condition 3. In a floot selector for elevator control to receive the registered calls wit-hin the first systems, r. base, an arm movable over said or, block. The exclusion of the car A from bas-e-incorresporidencewiththe,movementof 1.10

1,720,638 an elevator, a set of coiita6t seg:ments @paced along'said ba@e in the direction of movement of said movable member a second set of contact segments spaced alon- said base in the direction of movement of @-aid movable member means for mounting said movable member ) for movement into engagement with either of said sets of segments, and magnetic means op6rable-responsive to the direction .10 of movement of the elevator for determining which of said sets of contact s6gments is to be eng 1:@ed. 4. floor selector, for elevator control systems, a base an arm movable over said 15 baso, in correspondence, with the movement of an elevator, a. set of contact segments spaced along said bas6 in the direction of riiovement of said movable mpmber, a sce6nd set of c ' ontact segments spaced along said 20 base in the direction of movement of said movable member, means. !or motinting,tbe a-ble responsive to the arrivdl of the eleviitor at the ends of its path of mov.ement fo(r re30 versino, the sets of contact segments eng@ ged. 5. fn a control system for a bank of olevators oper-able over a pat I h between a plurality of.floors, a,plurality of elevator cars, means dividing said path into zones of operation 35 eacli zone including a plurality of adjacent floors, call means at @aid floors common to all of -said cars means for registering said' Calls, and mean5s o@erable by the entry of more than one of said cars into any of said 40 zones for rendering all but one of said cars ineffective to receive registered calls in that zone' 6. In a control system for a baiak of el@,vators operable over a path between a plural45 @ty of floors, a pltirality of cars, megns dividing said -path into zones of operation, each zone includin-- a plurality.of adideent floors, call m'eans at Waid floors common to all of said cars, means for registering said calls, and r)o means operable by the entry of more than one of said cars into any of said zones for rendering only the last cat entering said zone effeetive to receive said calls. 7@ 1-n a control systeiii f6r a bank of elevators operable over a path between a pliirality of floors, @ pluralil@,y of cars, means dividin-, said path into zones of operation, each @zo e including 'a plurality of adjacent flo6rs, call nieans at said floors common to all of said cars, 70 call-reeeiVing'.means for each of said cars, means o e ' try of a car into a perable by th en , zone for rendering the receiviiig means for all of said co,rs i@opera.tiie to receive calls from the floors in that zone, a,nd means oper- 75 able upon further movement of said car iiito @said zone fo rendering the receiving means for ihat car effective to receive calls for floors in that zone. 9. In a control system for a bank @f eleva- 80 tors operable over a path between:a plurality of floors, a plurality of cars, means d-ividincr said a ,nc,u@ th into zo nes of operation, each zone ing a plurality of adjacent floors, call. means for said floors common to all of,said 85 cars, a zone telav for each of said cars for each 55 tors oper,,ible over a @atli be'tween a plur'ality 'said cars for stopping, the associated cilr, call 120 of floors, a plurality of elevator cars, means means at said floocs, means dividing said dividing said path into zojies, of operation, -,floors into blocks, each block including a plueach zone including it pliirality of adjacent rality of adjacent floors, and means lor renfloors, call means at said floo.rs common to all dering the cal-I means fDr any of tlle floors in 60 Of said cars, means for reo-isterin-o, said calls said b-lock ineffective to actuate the sto@ppin(y 125 -z5- I n and means opeiablia by the entry o? more thfkn means for the first car entering said block. one of said cars into any of said zones -for - In testimony whereof, I have hereunto subrende,ring the fir@t car ineffective to'receive scribed my name this 28th day of December, cars and nieans operable by further 'Movem e n t o f s a i d c a r i n t o s a i d z o n e f o r a c t u a t 9 5 i n g t h e z o n e r e l a y f o r t h a t z o n e f o r t h a t c a r . 10. In a control system for a bank of elevators operable between a plurality of fl6ors, a plurality of cars, means indiyidual for eacli of said cars for stopping the I ssociated car, call means at said floors, mea'n:dividing.said loo ffoors into blocks, each block including a plurdlity of adjacent floors, and means operablo by the . entry of more than one of said cars into a block for renderino, said call means for all but one of said cars ineffective to actuath the io5 stopp means forsaid cars. 11. %iga control system for a bank ofelevators operable between a plurality of floors, a plurality of cars, means individual to each -of said cars foi stopping the associated car, 110 call means at said floors, means dividing said floors into blocks, each block including a @lural ity of adjacent floors, and means to rende r said call means effective to actuate the stoppi ng means for only the last of the cars 115 to enter said block. 12. In i control system for a, bank of elevators operable between a plurality of floors., a pluralit y of cars, means individual to each of said movable member for m@ ove.-,Yient into . of said zone!Sl r@eans for each zone @relay for engager@ent with eitber of said sets of seg- maintaining said zone relay operative wlien ments, magnetic means operabl6 responsive actuated, mea'ns for releasing each, -of. @aid 25 to the direction of m'ovement of the elevator maintainin ins operable b 9 me ans , me @ 'th e 90 @ for det er mi nin g wb ich of sai d set s of co n act ent ry of a car int o a zo ne for act uat inlr le resegments is to be engage'd, a , nd means oper-, leasing inea-iis for that zone for all - of said said registered calls in that zone. 1927. 65 8. l[n a control system for a bank of eleva- - - - EDGA-R M. BOUTON.

DISOL.AIMER 1,720,538.-Edgar M. Bouton, Chicago, 111. EixvAToR-CoNTRoL STmm. PmLtent Disclaimer fil@d April 7,1931, dated Jiily 9 1929 ' by the assign", 1,Ve8tingliou,8e Electrie & Ma;;iacturing CompanyHereby enters this disclaim@r to t4t part of the claim in said specifici-tion,,which -tpl)ears as claims 3 and 4 and is in the following words, tck wit: 3. In a floor selector for elevator control systems, a ba--,6 an arm movable over said base in -correspondeilee with the moveiiient of an elevator,'a set of contmt seg-. iiients spaced along said base in the direction of moviament of said in6vable member, a second set of contact segments spaced alon 'said base in the dir et' n f. movement g e lo o of -said movable member, means for mounting said movable member for movement into engagement with either of said sets of segments, and magnetic means I operable responsive to thi@ direction of movement of the elevator for determining which of said sets of contact segments is to be engaged. 4. In a floor selector for elevator control syst(@ms, a,b@@,, an arm movable over said base- in corre@ipoiidence with the niovement of an elevator, -a set of coiitact seg-iiients spaced alon,,, said'base in the direction of movement of said movable member, a secoiid set of contact.,,,egiiients spa(!e(I along said base in the direction of movement of sai(I ino.vable ineiyiber, means for mounting the said niovable member for movellleiit into! en(ra(remeiit with eitlier of said sets of segments, i-nagnetic means operable . L@ t-I i-esponsive o the direction of moveiiient of the elevator for determining which of said sets of contact segments is to be en-aoed, and means operable responsive to @the arrival of the elevator at the ends of it-s path of movement for reversing the sets of contact segments engaged." [Offleial Ga,-ette Apiil 08,1,1)31.]

Patente,d July 9 1929. lt72Ot538 UNITED STATES PATENTOFF,ICE* EDGAR M. BOUTON, OF CHICAGO, ILLINOIS, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION oF RENNSYLVANIA. ELEVATOR-CONTROL SYSTEX. Application filed idnuary 16, 1928. Serial, No@ 247,156. R Ell S S U E D My invention relates to ccfn I trol systeiiis and cars are automatically stoi)ped @t the several , it has pbrticultr rolation to systeins of con@. - floors in response to passenger-operated pushbuttons, and wherein the approaching ol: two cars, travell-ing in the same direciion within a predetermined distance, prevents the first 6o car travelling in that di@ection from stop in p g@ in response to the passenger-operated- puslibutton s. My invention will be described with referenc e to the accompanying drawings, where- 65 in: Figti re 1 is a diagrammatic view of my control @ystem as applied to two elevators operat, in(,@ in adjacent hatchways; and . Fig. 2 is a diagrammatic view o'f my block- 70 ing or zon@ing system as applied to two adjacent elevators oi)eratinz between ten floors. Fir,ure I illustra'tes a control system for two el6vators, A and B- the drivino, systems' for which are identical and. the control for 75 only one of which will theiefore, be specifically described, the letter A preceding the refere nce characters for the, parts descr-ibed. T.Li e control systein for elevator car A comprises a coiatrol system bf the variable voltage so or WardLeonard type and inell-ides a drivin(-r motor AM o,f the shuntwoiind type having a shunt-field winding AMF and an arm,,tture AM'. Directly coupled to the armature ture AG' of a generator AG. The generator AG is preferably of the compound-wound winding AGSF, and a demao-net'Die generator go in "loop'9 circuit with the armature AEM' of a hoisting motor AEM. The hoisting motor AEM is provided with a shunt field winding AEMF and bas its armature AEM' direetly coupl6d to a hoist- 95 ing drum AD, over which a cable AC, suspei,,iding the elevator car A, passes to a counterweight AW. The hoisting rnotor is controlled as to direction and, speed throuo,,h the agency.of an loo up-direction switch Al, a down-direction switch A2 and a sp6ed relay A3.. These relays are c erated by the acttiation of a e'ar T, switch ACS mounte,a upon the elevaior car A. Each of the floors iiatermediate the t eirml- 105 nal floors.traversed by,tlie elevator car A, is provided with a pair of call ptish-buttons, on6 for "up" and one for "down" travel. The call buttons for the third floor are desi-nated by the reference numerals 3U and 3D, re- iio 'O stop only when travelling in th in AM' of the dr.iving motor, AM is an arma- 85 trol for roa;d veli'cles, elevators, hoists and similar,. apparatus. 5 An 6bject of my invention is to provide a control system for elevators wherein the elevator may be started by an attendant on the izar qiid stopped by the persons desijring to use the car. I li Another object of my invention is to pro.. vide a control system Tor elevators wherein the car is started by an attepdant on the car and stopped by the operati.on of push-buttons, either at the landings at which persons 15 desire to boarl the cux, or by push-buttons -,vithin the car corregpondincr to the floors at which passengers wish to leave the car. Anotlier object of my invention is to provide a contiol system for a plurality of cle20 vators in a bank,. wh6rein eacli of the cars js started by an attendant on the car anid wher ein passen@ger-operated means'at the several landiilos'traversed by the elevators will cause the @Arst, car to approach the cor25 responding floor to stop for such passeiager or passengers. Another obje6iL of my invention is to pro-. vide a control system, as described in tlio preceding aragrtph, wherein the car will p e direction ivliich the passenger wishes to go. Another object of my invention is to provide a control system for @ plurality of elevators in a bai@i, wherein eacli car may be started by the attenddnt on the car and stopped in respon@e to@ passengeroperated push-buttons and wherein the fir t car . to approach the floor restores the passen er-op9 crated butfo'ns and preveiats cars approach40 ing@,the floor subseque-ntly from stoppingr at sueh floor. -&n6ther object of'my invertion is to provide a control systeih for a pliirality of ele. vators operating between a plurality of floor@ls, 4,3 where in the shaft for each of the'ears is divi(led into a plurality of zones or blocks, each including several adjac6nt floors and wherein the condition of two cars being simultane ously within a zone or block prevents the 5o car which first entered. the @ zone from re ceivin--si(ynals or being stopped.at any floor @n t5 witliiia that zone in response to calls froin floors witbin that zone. Anotlier object of i-ny invention is to prolo 55 vido a control system r elevators where'n

11720,538 spectively, those for the second. floor by the reference numerals 2U and 2D respectin,ely. While only foui- floors are illustrated in the drawing, it will be obvious from the followinlr description that the system may be applied to a@y number of floors without modification of the essentials of my invention. No buttons 'are shown for the terniinal fl6ors since, in the usual iiiethod of opeiat10 ing elevators, each car makes a complete trip from one terminal to the otlier whenever the ear is started in either direction and since limit switches are universally provided fo'r automatically stopping the car at the termi15 nal flooi-s. Push-button relays are sho,%vn connected to the res pective'push-@buttons 3U, 3D, etc., and, are designated, respectively, by the reference numerals R3U, R3D, R2U and R2D. The 20 coils of these relays are respectively connected in series relation with contact members on reset- relays S3V, S3D, etc. These relays comprise means for registering and cancelling calls for service at the correspondi ng 25 floors, as herein.after more fully described. A push-button for each of the floors is mount4bd on the car A, the button for the third floor being designated by the reference numeral C3 and that for tli6 second floor by 30 the numeral C2. These buttons are associated with relays CR3 CSR3 et 'n a manner similar to that describe'd 'fco"r'the buttons and reliiys mounted at the various floors. It will be noted that only one button for, 35 eacli floor is provided in the car f(:)r stopping the car when travelling in either direction. Floor selectors AFS and BFS for the respective cars areillustrated in the lowermost portion of Fig. 1. The floor selectors are ,,o duplicates. of each other and each comprises se ' ries of contact segments mounted upon suitable base (not shown) and trave'rsod by movable floor selector arm AFSA (or BFSA for car B). The arm AFSA is driven 4ti in correspondence with the movements of the elevator car A in the nio@nner usually practiced in the control of signal systems, that is, the arm AFSA is'mounted upon a screw AS, which is connected for rotation with some 50 movable part of the elevator hoisting mechanism. Asillustrated4 the movable arin AFSA is partially rotated about the screw AS by means of. a pair of mao-netic members ADS and AUS so as to engage, respectively, r,5 the right hand or "down" set of contact segments with the brushes 63 of the right-:hana portion of the floor sel@ctor arm AFSA-, Qr to engage the left hand or "up" set of contact segments and the brushes on the left-hand 60 portion of the selector arm AFSA, depend-ing upon which of the magnetic members is energi,zi@d, - The system *ill be best understood when described in connection with an assumed op(i5 criltion. Assuming that.the elevator car A is at the uppermost ter-minal or- fourth floor, the operator starts- the car do,%,@- n%vardly'by movin- the liandle of the car switch ACS to the left, engagin- contact niembers 10 and 11 wit-h the contact segrnent ACS'. This 7o operation ener,,,izes the down - direction switch A2 throu,,h a circuit extendinr from line conductor Ll tlirough cond,uctor 12, the coil of down-direction switeli A2, conductor 13 contact meiilber 11, c'ontact segment 75 A@S', contact mem-ber 10 and conductors 14, 15, 16 and 17, to line conductor L2. Down-direction switch A,2 completes a circuit for the generator shunt field windin.-I AGF extending fi-om line conductor tl, 80 througli c6nductors 12 and 18, co.-,itact mcm-- bers a of switch A2, conductors 19 and 20, the generator shunt field windin- AGF conductor 21, resistor 22, conductoi@ 23 an'd'24, contact members b of switch A2, and c6n-'85 ductors 25 and 26 to line conductor L2. Dikoetion switch A2@ also completes a s6lf-holding circuit extending from line conductor Ll, through conduct4or 12, the coil of the down-. direction snvitch A2, conductor 27, contact 90 members c of switch A2, -conductor 28, the normally closed contact members 29 of the up stop-inductor-relay 30, conductor ')I, the iiormally closed contact niembers '2 of down stop-inductor-relay 33, and coiidu I etors 34, 35 95 and 26 to line conductor L2. The functions of the inductor relays 30 and 33, in'@ this system are the same as those disclosed iii my cop,ending application Serial No. 731,921, filed August, 14, 1924, and assigned 100 to the Westin(,rhouse Electric & Manuf acturing Comp any. In that application is diselosed an elevator control system wherein the holding eir'cui.ts for the direction and speed switches are automatically operied by the in- 105 ductor-relays as the. car approaches predetermined ponts n the hatchway, thus stopping the car accurately. level with the adjacent floor. Referring'aLyain to Fig. 1, a further opera- 110 tion of the ca@'switch ACS engaoes the contact members 10 vind 36, completing a cijrcu@it for the speed relay A3 extending fi-om line conductor Li,' through conductors 12 and 37, tlle coil of rela@ Ag, conductors 38 and 39, 115 contact member 36, contact segment ACS' of car switch ACS, contact m'e:mber 10, aiid conductors 14, 15, 16 and 17 to line conducior M. act members a, excircuit for the 120 AGF causing ase i ts speed and, by operation of its contact members b, completes a @elf-holdin@, 'circuit extending from line con(luct@r Ll, through conductors 125 12 and 37, the coil of relay A3, coiiduetors 38, and 40, cont-act, members & of switch A3, conductor 41, 'normary closed coxitact members 412 of an up sl6w-down-inductor-relay 43,@ conductor 44, the normally closed'contact 130

1,720,538 niembers 45 of a down slow-down-inductor- the circuit for the "up" magnet AUS, the subrelay 46, and conductors 35 and 26 to line con- sequent reenergization of the magnet AUS ductor L2. will be ineffective to draw the arm back to its The inductor relays'30, 33, 43 and 46 are neutral position or to rock it in the "up" di. preferably of the type described in the co- rection, until the dowu magnet ADS has been 70 p I ending application of John F. Clancy Se- deenergized. A suits@ble'switch DL is prorial No. 559,997,- filed May 11, 1922, and in the vided for engagement by a cam DLC when copending application of H. W. Williams, the car approaches its lower limit of travel for Serial No. 190,482, filed May 11, 1927, and the purpose 6f deenergizing t.he "down" magio assioiied to the Westinghouse Eloctric & net@ADS as the car arrives at the lower ternii- 7t; 'Manufacturiiig Company. The operation of nal. Thus, as the car starts downwardly, in these relays is such that the energization of response to the above-described operation, the coil for the relay does not aciuate the the floor selector arm AFSA will have been' associated contact members immediiitely, but rocked to engage the down contact seo-ments, 15 when the relay structure is brought adjacent that is, the right-hand set of segi-nents. 80 a magnetizable inductor plate, the energized Assume that a passenger at the third flo6r coil wiU effe@t an operation of the contact desires to travel downwardly and operate's members. the button 3D at the third floor. A eireiiit When the:car is moving,upvvardly, the up :is thus cornpleted for the push-button relay 20 inductor-@ela'ys 30 and'43 cooperate with R3D extending from line conductor Ll, 85 m . agnetizable iron.inductor plates mounted througli conductor 50, the push-button 3D, ,in the hatchway, one for ea@h of the floors, conductor 5.1, uhe coil of relay,R3D, conducthe plate for the third floor being designated tor, 52, the normally closed contact members by reference numeral 3]k and ihat for the of the relay S3D, and conductors 53 and 54 25 second.being designated by reference nu- to line conductor L2. The energization,of 90 meral 2X. The down inductor relays 33 relay R3D completes a self-holding @ireiiit and 46 cooperate with inductdr plates 3'Y and. extending from line. conductor Ll, through 2Y-, as the car ap,proaches the third. and sec- conductor 55, the contact members of the reond floors, respectively, in the down diree- lay R3D, conductors 56 and 57 and. thence so, tion. The relative position of the inducto@ throug h thecoil of the relay R31) t6 line con- 95 ,.plates and inductor-relays with referonee to ductor L2, as previously traced for this' coil. the floors is such that the relays will be actu- The closing of the contact membeis of ti-ie, ated to ol)6n -their contact members when th6 relay. R3D connects the Iiiie conductor LI car is at such distance from the floors as tQ to t4e ihird floor contact segment 58. As tlle 35 permit the op6ning of the speed a.nd direction car Approaches the third floor, the floor selec- loo switches to stop-the car accurately level with. tor @rm AFSAconnects contact segments 58, the adjacent floor. and 59 thus completing a circuit to the coils As soon as the.elevator car A starts down- 'of the "down" -,low-down and stop relays 33 wariily, the attendant on the car rnay return- and 46, whielh eir.cuit extends from line con40 the car switch ACS to the central or off po- ductor LI through -conductor 55, the contact i o,5 sition@ and the car will continue to move members of relay. R3D, conductor.s 56, 61 downwardly at hikh speed,-since the' above- and 62, contact segment 58, the. brushes 63 on the .traced. self-holding circuits. foir direction the floor selector arm AFSA, contact segand speed switches remain closed independ- ment 59 conductor,64, the coil of relay 46, 45 ently of the car switch ACS. conductor 65, the coil of the relay 33, conduc- iio. As the car apprbached the upper terminal' tors 66 and 67, contact member 68 of the car on its way up, (prior to, the start of the down trip asdescribod) a cam ULC mounted on the car, was brought into engagement with a tio switch. TJL, preferably of the limit switch type, and dis6ngaged the contact members of the switch. This operation of the switch TJL opened the circuit for the "up" floor selector ma,@,,net AUS, permittiia-, the coil of the 5,5 "down" floor selector magnet ADS to draw the rilyht-hand portion of the floor selector arm AFSA into engagement with tho down sets of contact segiiients (those on the righthand @ortion of thefloorselector AFS). The 60 ma,,anets AUS and ADS are of the high-resistance @ype a'nd are designed to have their circuits completed at all ti@aes during whicli the car is between the terminals. When the movable arm AFSA has been rocked to "down" 65 cohtact-engaging position by the openin of 9 switch ACS', coiitact member 10 and conductors 14, 15, 16 and 17 to, line conductor L2. It will be noted that the circuits for the inductor relays extend through the central con- iii tact member 68 of the car switch ACS, thus rende ring it necessar'y that the. car 'switch ACS be in its central or o:ff position, in order that the inductot relays may be energized. As the. car approaches more closet to the i2t) third floor, t-he.inductor relay 46, in passing the inductor plate 3Y, open@ its contact memb ers 45, thiis, breaking the circuit for the speed relay A3. The odoijing of the speed relay A3 re-inserfs the resistor 22 in the gen- 10.5 erator shunt field v,ind@ng circuit and the car slows -,down. As the car approaches ineare 'r to ihe third floor, the relay,-33 i similarly actiiated t6 o.pen.its contact members, 32, thus d enerLriiiiaLy-the "down" 4irecti6in 130'

1,720,538 switch A2 and . stopping the car accurately level-With the third floor. These indu,ctorrelays thus form a call-receiving means on the cars for the rec*ption and translation of ti calls for service for the cars. .After the car is stopped and the third floor passenaer has entered, the attendant on the -car may again start the cir downwardly by io the operation of the car switch ACS, as previously described. The car will coiitinue downwardly, stoppiiio, in response to the operdtion of any of the "down" passenger-operated bu.ttons, as the,car approaclies the corresponding floor. 15 Just prior to the time that the car arrives at the third floor level, the floor selector arm AFSA will enga(re the cojitact member 70 on the floor selector, thtis connecting, by means of the brushes 63, the codtact segments 20 58 and 70. This operation will complete' a circuit for the reset relay S3D to restore push-buttonrelayR3D. Tliiscircuite-xtends from Iiiie conductor Ll, throtigli conductor 55, contact members of the i-elay 113D, conduc25 tors 56, 61 and 62, contact segiiic@nt 58, brush6s 63 of floor selector AFS, (!oiitact segment 70, conductors 71 and 725 coil of relay S3D, and conductor 54 to line conductor L2. The operation of relay S3D opens the holdino, cii-- 30 cuit for the relay R3D, tbus restorina the circuits for the third floor down call to normal inoperative conditiori. It will be ol,)Served that the ener-ization of the relay R3D in resppnse to the opera35 tion of the button 3D connects line conductor Ll to contact segment 58 for the car A and also to the contact segment 73 of th-- floor selector for car B.- The conductor 61 may be further e)@fended to con'nect to aDy nuiii4o ber of elevators in the bank, wliereby the operation of a single btitton will condition the floor selectors for all of the cai-s to opei,ate the inductor slowdown aind stop relays for the associated car, as that car approaches the 45 third floor. The first of the cars to appi,oach the floor will be caused to stop and, as the car arrives at the floor, the consequent restoration of the relay R3D to norinal position prevents any other car subsequently approach-5o ing the third floor froni stopping in response to this tllird-floor "down" call. Assuine that t-he passen@,rc@r wbo entered tlie. cai@ at the thii- d floor desires to travel to the second floor. Tiie atteiidant on the car %vill 55 operate the butt6n C2, coi-nple.fing a. circuit for the relay CR2 extending from the line condtictor Ll, through conductors 74, 75, 76 and 77, push-button C2, conductor 78, the coil of relay CR2, and conductor,, 79 and 17 to 60 line conductor L2. The operation of relay CR2 connects l,ine conductor LI t6 the 4@ontact segment 60 of the floor selector byvvay ofcondlictors 74, 75, 80 and 81, contact I members b which extends from line cqnductor Ll, tlirougli conductors 74, 75 and 80, iform.ally closed contact members of the re-,toring.relay CSR2, conductor, 83, the cojitact ixicinbers a of relay CR2, coiiductor 84, the doil of relay 70 CR2 and conductors 79 and 17 to line condtictor L2. As the. car approaches tlie., second floor, the cii,),a(yement of the contact set--ment 60 and tile contact segment 59'by tlle brushes 63 of 75 the @ii-i-fi AFSA will complete a eircuii for enei-gizin(y the inductor slow-down stoppin ,g relavs 46@'and 33 in a nitinner similar to that des@i-ibe(I f(r the third floor stop. The car will thus be stopped at the second floor. 80 It will be observed that the conductor 85 connectincr the second floor segmc-nts for the "up" and@' "down" directions, respectively, permits th@ operation of the second floor car biitton C2 to ciiergize both the up hnd down 85 segments for thc- second fl6or; thus the car %vi II be e@tised to stop at the second floor from either direction in response to the operation of the car bi-itton C2, and similarly the button C3 will cause the car to stop at the third floor 90 f roni either direction. The (,@:tr push-button relays for car B corto . ()nding i-elays CR2 and CSR2, etc.,' re9 ll.,Il@e been oniitted in the dra-Nving, in order to silni)lify it. It must be assumed, hom,e*,er 95 that thesc- relays are provided for car B as in-' dicated by the arrow-heads on the corresl)ondin conductors. As t car continues its do-%vii@vard travel and approaches the first floor, the earn DLC I(Ju will ed(rage a I -,witeli DL', pi-eferably of the limit switch type, and will close the contact members 87 and 88 of the switch. Tlie'coiitact meinbers 87 will complete a circuit eiiergizing the "down" inductor relay coils 33 and io5 4C), 'which circuit extends f rojil lide conductor Ll, through conductors 74,75 and 89, contact itiembe'rs 87 of the switch DL', conductors 90 and 64 to the coils of relays 46 and 33, and thence to line conductor L2, as previously 110 traced for these coils. The contact members 88 of s,witeli DL' complete a circuit for the restoring relays CSR2 and CSR3 exten@ting fi-oi-ii line conductor Ll through conductors 74, 75 and 89, 115 contact members 88, and conductor 91, to a jiinction-point 92 and thence to the coils of the relays CSR2 and CSR3 in parillel rela-, tion) the circuit for relay CSR2 extendin(v by way of conaiietors 93 and 94, the coil of r'@clay 120 SOP,2 and conductors, 79 and 17 to line coiiductor L2. Thus, the push-button relays for all of the car push-buttons are re.,,-tored when tho car approacbes the lower Iiinit of travel. As the car approaches the upper limit of 125 travel, the switch TM' operates in a similar manner to perform the restorinr function at the end of the "up" trip. of relay OR2, and eonductor 82. The relay . From the above description, it will be clear CR2 also completes a self-holding eirc,uit that each of the elevators is started by the op-: 130

1,720,538 d@ation.of the car swi.tch for that car, by the arm engages and bridges a set of contact menibers 109, 110 and 111, as the car enters the zones 101, 102 and 103. A set of "down" block relays., one for each of the zones, designated as 112, 113 and 114 7o are. provided liavin- their coils respectivel y connected to the contact segments 111, 110 and 109 and their'contact mei-nbers respectively connected to the seginents 103, 102 and 10l... The purpose of the block relays 112-, 75 etc., is to connect the block segments 101, etc., to the "down" inductor rolay co ils onl when y th'e car is in the corresponding block or zone. Each of the r@lays.'112, etc., is provided with a latchino, member, ti.ie refererice cliar- 8o Acters 115, 116and 1'17, respectively, designating the latche's for the relays 112, 113 and 114. The latch member 115. is normally - spring-pres@ed, as by spring 118, to engage the latch meinber 115 witli a shoulder o@ 85 hotch 119 iii the armature of th6 block relay 112. Similar springs operate tlie latches 116 Figur@ .2 shows the blocking or zoning sys@ I and 117. Magnetizable coils 120,121 and 122 are arranged to wi thdraw the latch members 115, etc., fr6in engagement with the respec- 90 tive block relays. A similar set of block relays, latches and coil @ are provided for the "up" direction' of trav el, being designated generally as 129, 124- and 125. 95 Th e contact segments 126 are eonnected as iri. Fig. .1 to the respective push-buttons' mou nted upon the car and are designed to be connected with the continuous contact strip 127 b'@ means of a brush i28 insulating- 100 ly Mounted, as at 129, on the fl66t selector arm. @The contact strip 127 is connected, as by a conductor 130, to a conductor 131, which - feed s the coils of the "down" inductor-relays (33 and 46 of Fig. 1). The contact segments 105 132 are connected in patallel relation to corresponding contact segments 132' on the floor selector BFS' for the car B and in series relatioii with the contact members of the pushbutton relay@s corresponding to R3U and R3D 110 of Fig. 1. The contact se,-Ments 133 are' rereset relays c6rrein Fig. I for the the conta@t seg- 115 ment 101 (which corresponds to the C'ontact sogment 59 in Fig. 1) hiay be connected to the indubtor relays 33 aiid 46 only in the case that the block relay 114 has its contacts clos6d. The circuit for these inductor relays 120 extends from the lin6 conductor Ll to the contact seomerit 132 through the push-button relay R3D, etc., of Fig. 1, and conductor 134. Thence the circuit continues through the setrnent 132 corresponding.to the ninih 125 floor, rush 135 on the floor selector arm eS conductor 136, the,conet I-- ,mtT en t 1 0 1 @ of reliy 114, and conductor 137 to the conductot 191 which extends to the (15 contact brush 108 on the fl6or selector. indtictor relays 33 and 46 of. Fig.' 1. 110 attendant on the car, and that as soon as the elev,,itoi st@ris, the car switch may be centered, permittin@ the car to@ continue moving iintil it automatically stops through the operation @ of the landing push-buttons- 3U, etc., common to all cars, or the car btittons individual to the eir. The ope ration of one of the landing buttons 3U, etc., prepares circuits 10 for stoppin- all of. the ca@rs in the bank, but only the fir@i car to approach t,he floor in the direction for which such button is operated will stop at the floor' if , for any reason, such as when a car is 15 loaded to capacity, the op6rator desires to travel to the terminal floor without making further stops, the movement of the car switch ACS. will break the eir@ouit to the inductor rela,ys and the car will not stop in respons-e to 20 an 6perated push-button. This permits the. operator to pass floors for which buttons have been operatea. tem for two'elevators operating bet@veen ten 25 flo6rs. This system comprises floor selectors AFS' and BFS' for tho cars A and B respeetivel-y. The gen@ral a'rrangem6nt of the contact @e,-ments for these fl6or selectors is identical with that shown for the floor selectors in 30 Fia. 1. The &sential differences between thefloor selector of Fig.. 2 and those of Fig. I reside in the division of thi@ coiitact segment 59 shown in Fj'ig. 1 into three sedarate, segments. designated as 101 .102 and 103 in Fig. 2. 35 Each of these segments extends over such portion of the.travel of the floor selector arm AFSA', as represents the travel of the, elevator between at least three ffoors. In the system illustrated, the ten-floor 40 liatchway is divided into three zones, the first including the first, second, third and fourth. floors, the second includino, the fifth, sixth and @eventh floors, the l@'st including the eighth, ninth and tenth -floors. The descrip45 tion of the relation of the various floors will be hereinafter set forth with reference to the position of the car relative to the floors, as repregented by th6 movement, of the floor selector arm over the floor selector. 50 The floor selector AFS' shqwn in Fig. 2 represents a seriies of "down" egmexits, shown on the left-hand side of the floor selector, and a series of "up" segments 6n,the right-hand side. At the entrance to each df 55 the zones of blocks, as defined by segments 1011 102@ 1,03, etc., a normally open contact switch mechanism, comprising ,,witches 105; 106 ind 107, is mounted for actuation by a tripping' mechanism 104 on the floor select6r 60 ai-m AFSA', which will engage. and operate the switehes 105, 106 and 107, respectively, @s the car moves downwardly into the zones defined,respectively by the segments .101, 102 and.103.

Assuming the car to be at the upper ter- receiving further caus while within that block minal or tenth floor a,nd to be, started down- permits the car A to move into the next block .wardly as described with reference to Fig. 1, before receiving any further calls and throws. the left-hand portion of the-floor selector arm the burden of the traffic to the car B. wiR engage the left-hand set of contact seg- . For the usual operation, cars are dispatched 70 nients on the floor selector. As the car starts, the tripping member 104 will engage and ol)erate the switch 105, thereby completing a circuit for the latch magnet 122 for the e-ar 10 A and magnet 122' for the car B. This eir4cuit may be- traced from line cbnductor LI, through conductors 138 and 139, the contact members of the switch 105, and coi@iductor 140, to itinction point 141, whence one bra nch ex15 tends by way of conductor 142 through the ma,-net e-oil 122, and conductor 143 to line conductor L2 and the other branch extends by .way of conductor 142', the magnet 122' aiid conductor 143' to line conductor L2. The eneroization of the magn6ts 122 and 122' will relba-;P- any of the first block relays for all Of the cars, which may happen to be energized. At substantiary the same inst@nt, the brush 108 of the floor selector arm will engage and 25 bridge the contact segments 109, coinpleting a -circuit for the first blo@k relay 114 forihe e-ar A, which circuit 6xtends from line cbnductor LI through conductor 138, contact.segments 109 and brush 108, condtictor 144. the 30 coil of -block reltl--v 114, and . conductor. 145 to line conductor L2. This operation energizes the bloek relay 114 and causes the relay to close its contact members, a. The car A Will thereafter pick up any call for the u per p 35 Izonel@ that is, the ninth and eighth -floors and make the necessary automatic stops in response to the caus registered by the floor buttons (not shown) for the ninth and eighth - floors. 40 As the car passes the eighth floor, the trip rneint),6r 104 will engage and operate the switch 106, aiid the brus.. iOS will. engage the contact segments 110 to first release all of the second block relays and subsequently. actuate 4r, the second bl6ek relay 113 corresponding to the elevator car A. Th@s o fo pteration pre@ares the car to take, all calls' r Ile m'ddle zone, I that is the seventh, sixth and fifth floors. A.ssume now that the elevator car B, operat50 ing traznder substantially light conditions of , overtakes or a@proaches closely the (@ar A, for exiim le the car A is still I p , when i,vithin the tipper zone or block. The tripping meinl)er 104' of the floor selector arin IISFA' will engage, and o;erate the switch p 105, entrgizing the ma,-nets 121-) and 122', 1)ermittin@ the block r(3lay 114 to drop out, at such- inter-@als that, under normal traffic conditions, they will. never overtalze each other, and it i only under the @oiidition of an abnormal traffic siitiationtliat such okertal-,- ing- will occur. 75 M vstem. tlierefore, provides for erring y S3 for this abnormal traffic condition by,releasing the first car, which bas been beai-i-n- the burden of the traffic, from ftirther load - *vitiiin a given zone aiid causiiig the traffic in that 8o zone to he thrown upon the following car which lias been operatin- under comparatn tivelv ligbt traffic conditions. It - @vill be observed that iiiy systei-n I)rovides for the distribution of the tr'aflf@ in accordance. 85 with th-- lo-,i upon the several elevator,cars, and that this distribution will cie4jur automatically in.response to the variations o.f tlle traffic conditio'ns. The description and illustration of m* @ys- oo teni is i-nerely illustrative, the syste'@n . being capable of fiiany variations in the apparatus and cireiiits described. 1, tlierefore, do not desire to be limited to the systern sliown and d-escribed, except as defined in the appended 95 claims. I