US1930514A - Two-button multicall control system - Google Patents

Description

Oct. 17, 1933. w. F. EAMES 1,930,514

TWO-BUTTON MULTICALL CONTROL SYSTEM Filed Jan. 7, 1932 s Sheets-Sheet 1 INVENTOR William PEG/776$.

ATTO EY w. F. EAMES 1,930,514

TWO-BUTTON MULTICALL CONTROL SYSTEM Oct. 17, 1933.

WITNESS s; INVENTOR William F'E'ames. (O v BY M ATT NEY l- 1933- w. F. EAMES 1,930,514

TWO-BUTTON IULT I CALL CONTROL S YS TEM Filed Jan. 7, 1932 3 Sheets-Sheet 3 Star! Up Start down 6' mice] down cal/s Garyamy up Sfap downed/s Caz/" 01719 up Stop and cancel up (Jails Gar going 11 Stop up call: Gargoz'ny dawn Stop (mica/reel down cal/s Cargoi/zg dawn 25 Cancel up calls 24 Caryoz'ng down WITNESSES: INVENTOR WZ'ZZz'amFEames.

ATT NEY Patented 17, 1933 Two-Barron 1,930,5i4 1 MULTICALI'I ooN'raoL srs ,wmam rf na es, ,ndgewooarai, assignor to V .WestinghousefElectrio & Manufacturing Company, a corporation of Pennsylvania Application January 7:, 1932. SerialNo. 585,256

1 My invention relates to"; elevator 'controlsystems and. has particular'reference'to elevator control systems of the multicall type.

In elevator systems'oi the multicall type, a pluralityof manual control elements,' usually push buttons for registeringthe,callsfotprospective' passengers for the elevator car, are pro vitied at the landings served by thecar. [These control elements are interconnected with relays for recording the calls, until the latter are an'-" sweredan'd for controlling the switches of the 'ing any callsregistered at landings from which,

system to cause .the cartostart in. thedireotion of landings from which cans have, been registered,'to stop at,1and to restart from, these landj ings in a predetermined sequence.

The actual sequence in which upon whether the system of theione button or twobutton multicalltype, and whethe'r'it is of the ,fthrou'gh trip. or. reversible type. {There may alsobe minor variations in the sequence of some systems of the same type A feature com mon to the sequences of all multicall systems, however, is that after the ca'rfhas started in one" direction to answer a registered call, it will ans swer all calls registered at landings in advance of thecar, in itsdirection of travel, before answerthe car is receding. I

-m the copendingapplication of Luther J. Kin

nard, Serial No. 197,279, filedfJun'e 8, .1927and assigned, by mesne assignmentatothe westing houseElecti'ic Elevator Company,.a two-button H reversible Inulticall system is disclosed in which the sequence of responseof the car to registered calls has the following characteristics;-v

1. The car answers all down calls when travelling in-thedown direction and answers all ,upficalls when travelling in thefup direction. a

2. The car answers th e hig hest do wn call when travelling inthe "up direction before answering other down calls and answers the lowest up call, when travelling in the down di- 1 rection, before answering other up calls, provided that no call is registered for the direction of travel in which the car is moving from land- Y w elevator system embodying my invention.

ings in, advance of the car.

3. The car answers afdown" call from a land- 7 ing lower or higher than the car and an'fs'wersanup call from a landing lower or higher than thecar. K i

4. Registered calls are cancelled only when answered. i

5. If there isLanfup and afdown call reg- I I i 'the ans a I answereddifiers in different systems, depending.-

iste'redirom the same landing; the "up direc-- vtion has preference if the car is moving upward- 'wardly when it arrives at the floor.

3 1y when it'arrives' at the floor and the down direction has preference if the car is moving downi The "characteristics listed above are all desirable for expeditious and satisfactory service. However, in order to secure all of them, in accordancewith the teachings of the Kinnard application mentioned above, it is necessary to provide four floor relays for each landing interme-. diate thejterminal' landings, and a floor 're'lay for each of the terminal landings; I have found that the characteristics listed above may all be secured: by a novel control circuit in which two floor relays for each landing intermediate the terminal landings and agsingle floor relay for eachof the terminal landings are provided.

' It is accordingly anobjectof my invention to 7 provide a' novel elevator control system of the an elevator control system "of the two button reversible multicall type; in which novel and simple circuits forthe re'gisteringand cancelling of callsshall be'provided, 1 l k l t l" jficts of my invention will become evi'- dent from the following detailed description drawings, in which V v Figure 1. is a diagrammatic view showing the relationship of certain mechanical and electrical elements of an elevator system embodying my invention.

Fig. 2 is a diagra mmatic viewfof part of the fioor selec'tor shown in Fig. 1. Y I I Fig. .3 isl:a diagrammatic View i lustrating the operation of anlinductor relay used inthe 1prac- .tice of, my invention.

.L Fig; 4 is afl diagrammatic view of an'elevator 7 control system embodying my invention. I Fig; 5 is adiagra'inmatic view of the call regis tering 'an'd cancelling circuitsfor a five-landing paratus shown therein comprises an elevator car I suspended by means of a cable' 2 which passes over ah'oisting drum. 3 to a suitable counter} weight 5.,"The hoisting drum 3 is mounted on a', shaftwith an elevator motor 5, a spring-ap- V plied electro-magnetically released brake 6 of I 75 reversible multicall type, in which twofioor re usual type, and a telemotor transmitter 7 preferably of the self-synchronizing type.

The telemotor transmitter 7 is electrically connected with a telemotor receiver 8 of the same type, in a well known manner,so that any r0- tation of the armature of the transmitter procluces a proportional rotation, in a corresponding direction, of the armature of the receiver 8.

The telemotor receiver 8 serves as a driving device for a mechanical switch or fioor selector 9, the purpose of which isv to commutate certain circuits of the system in accordance with the position of the car 1.

In the illustrated embodiment of my invention, the floor selector 9 comprises a vertically mounted base panel 10, upon which are secured suitable guide rails 11 for a pair .of vertically.

movable cross-head members 12 and 13. The cross-head members 12 and 13 are mechanically connected together by means of a chain 14 which passes over an idler sprocket 15, rotatably mounted on the base panel 10, and a driving sprocket 16, rotatably supported by means of a casing 1'7 mounted upon the base panel 10. The casing llcontains suitable gearing (not shown) for transmitting the motion of the armature of the telemotor receiver 8 to the driving sprocket 16.

The construction so far described is such that movements of the elevator car 1 are reproduced on a smaller proportionate scale as movements of the cross-head members 12 and 13. Although either cross-head member 12 or '13 may move upward in response to upward movement of the car 1, depending upon the phase sequence. of the electrical connections between. the telemotor transmitter 7 and the telemotor receiver 8, it will be assumed that the telemotor connections are such that the cross-head member 13 moves upward when the car moves up-' ward and covers its entire path of travel from bottom to top while the elevator car 1 is moving from its lower terminal limit to its upper terminal limit.

Referring now to Fig. 2, which shows diagrammatically, the contact elements or the floor" selector 9, a pair of rollers 18 and 19, are mounted on the cross-head member, 13 in suitable positions to engage rows of contact fingers 20, 30, 40 and 21, 31, 41, respectively- Each of the contactfingers 20, 30, 40, 21, 31,'and. 41, is biased by suitable means (notshown) so that it is. stable in either of two operating positions. The relationship of the rollers and. contact fingers is such that when a roller 18, for example, is opposite a contact finger which it controls, such as 30, the contact finger stands in a disengaged position between an upper and a lower contact member a and b respectively. When, however, the roller 18 is above the contact finger 30, the latter is held by its biasing means in engagement with the lower contact member I). When the roller 18 is below the contact finger 30,

I the latter is 'held by its biasing means in engagement with the upper contact member a.

A plurality of horizontal rows of contact segments 23, 24, 25 and 26; 33, 34, 35 and 36; 43, 44, 45 and 46 and 53, 54, 55 and 56, vertically spaced at intervals corresponding to the distance between floors served by the elevator car 1, are mounted upon the base panel 10 between the guide rails 11. A plurality of movable contact brushes 60, 61, 62, 63, 64 and 65, carried by the cross-head member 13, extend through the crossthe horizontal rows of contact segments mentioned above.

The contact fingers 20, 30 and 40 and the contact fingers 21, 31 and 41 are spaced vertically at distances corresponding to the distances between corresponding landings served by the elevator car 1.

The rollers 18 and 19 and the contact brushes 60, 61, 62, 63, 64 and 65 are so positioned on the cross-head member 13, that when the elevator car 1 is level with a fioor, such as the third fioor, the corresponding contact fingers 30 and. 31 stand in neutral position and the movable contact brushes 60 to 65 stand in positions between the rows of contact segments 23, 33, 43, etc., out of engagement with the latter.

Retuming to Fig. 1, a pair of inductor relays IR and 2R, preferably of the type disclosed in the copending application of Harold W. Williams, Serial 'No. 279,711, filed May 22, 1928 and assigned to the Westinghouse Electric and Manufacturing Company, are mounted on the car 1 in positions to cooperate with sets of inductor plates 1U, 1D, 2U and 2D, of magnetic material, mounted in the hatchway. For simplicity, only one set of inductor plates 1U, 1D, 2U and 2D has been shown, but it will be understood that a set similar to that shown is provided for each landing served by the car, intermediate the upper terminal landing and the lower terminal landing. A set corresponding to inductor plates 1U and 2U is provided for the upper terminal landing, and a set corresponding to inductor plates 1D and 2D, is provided for the lower terminal landing.

The construction and operation of an inductor relay of the type mentioned above, may be understood by reference to Fig. 3, which shows diagrammatically such a relay in connection with an inductor plate and an electric circuit. Referring to Fig. 3, the inductor relay 3R comprises a magnetic structure 3a having overhanging portions 35 and 30, a central core portion 3d and a pair of lugs 3e and 3f, all of magnetic material.

- A pair or? armatures 3g and 3h of magnetic material, are pivoted to the magnetic structure 3a in such manner that each may engage a corresponding lug 3e or 3 when moved to a horizontal position. A coil 31', connected in a circuit which includes a suitable source of electricity 3k and a switch BL, is mounted on the central core portion of the magnetic structure 3a. Each of the armatures 3g and 3h carries a movable contact member of a set of contact members 3UL and 3DL, respectively, and is biased to the position in which the contact members 3UL and 3DL are closed.

As may be seen from Fig. 3, the magnetic structure 3a and the armatures 3g and 3h constitute a divided magnetic circuit, both branches of which include a long air gap between the overhanding portions 3b and 3c and the armatures 3g and 3h, respectively.

The operation of the apparatus shown in Fig. 3 may be set forth as follows: Upon closure of the switch 3L, a magnetomotive force is impressed on the magnetic circuit of the inductor relay, but in the absence of inductor plates, the reluctance of either branch of the magnetic circuit is too high to permit operation of the corresponding armature 3g or 3h. The armatures 3g and 3h, accordingly, remain in the positions in which the contact members 3UL and 3DL are closed.

If the inductor relay BB is now moved to a position opposite an inductor plate 3D as ilarmature 3g moves into engagement with the lug 3e. 7 The armatures 3g and 3hgremain in engagementwith thelugs 3e and 3] after having been actuatedto such positions; regardless, of

84. This circuit, together with circuits for a re plate, and the corresponding armatureBh moves to the'po'sition shown, in engagement with the lug 3f. If now the inductor relay 3Ris moved beyond the inductor'plate' 3D, the armature 3h, nevertheless, remains in the position illustrated because of the leakage flux in the lug 31. If the inductor relay 3B is now moved so thatthe left side of the-relay passes an inductor plate, the

the position of theinductor relay-with respect to inductor plates, until the circuitftheIcoil 32' is broken by the opening of the switch 3I .i.f-

Referring now to Fig"." 4, which" shows dia grammatically, the connections between the electrical BIemeiWLOf Fig: 1 andthe remainder of the' system, the armature of} thei 'elevator motor 5 is connected in local circuit with the armature and series field winding '70s, of adirect current generator '70. The armature of the direct current generator is mechanically connected to the armature of an induction motor '71; having primary windings which 'may beconnected to a suitable alternating current,

source '72 by means of a manual switch 373,. *The' separately excited field winding 5f-of motor 5 is connected in amotor, field circuit 74' to a pair of supply conductors L1 and L2 which serve to' supply the direct current .used in the control system; The supply conductors-L1 and L2 may be connected to a suitable'direct -cur.-.

rent source "75 by means of a, manualswitch' 76. The ge ator 70 is provided with a'separately excited ldwinding'lflf, connecteddn a generator circuit" 77 to" supply conductors L1. 7 and L2, in series with the contact members of 4 a pair'of direction switches '78 and 79 and a field resistor 90. 'Ih'efieldresistor 80rmay'be short,

circuited byfcontact members of a speedzswitch 81 controlled by means of speed circuits 82and 83. I 1

The release coil of brake :6 is connected in a circuit with contact members of a brake relay lay 85 and'a direction maintaining relay '86 of delayed opening type, are joined toform a brake direction switches 78 and 79. V y I 1' The operating coil of direction switch 784s connectedin anup circuit'88 which includes contact members 1UR ofthe inductor relay 1R,

circuit 87,"controlled bycontact members of the contact members of an up direction'preferenc'erelay andcontactmembers of astarting relay 92.; Similarly, the operating coilof direction switch 79 is connected in a' down, circuit 89 which includes contact members: lDR of the inductor relay 1R, contact members of a "down" direction preference relay,91. and contact members of the startingrelay 92. The 'up? .and down circuits, mentioned above; are joined to form a circuit which includes the coils of a time element relay93 and the brakerelay 84, a reclosed, auxiliary gate contact membersi99 are provided. The auxiliary gate contact members 1930,514 lustrated inlFig.*3, th e reluctance of a branch, of the relay magnetic circuit is reducedby the 99, are biased 'to open-position, but are closed' 0 when the gate is fully open, 'asshown in Fig. '4.

These contact members (99) are connectedin a'gatefcircuit 100, withothe coil of a gate pref-A erence relay101, of delayed opening type.

The direction. maintaining relay 86, the time element relay 93 and the gate preference relay 101; which are all of delayed opening type, operate totheir energized positions instantaneous ly-upon completion" of their respective circuits,

but delay, in dropping out after interruption of their circuits for approximately twoseconds.

The resistor 94 is of such resistance that it passes a current of sufficient. value to maint'aina directionswitch '78 or 79 closed, if either is. already closed when the, resistor, is. inserted in the circuit,,.butz insuflicient to permit closure offla direction switch 'while theresistor isin,-v

cluded in the circuit.

Either the up? direction preference relayi90.

or the.down direction preference relay 91 may be closed inresponseto completion of one of a plurality of closing circuits 102,, 103 and 104,

each including contactumembers .of a set of floor relays 121, 122, 131, 132, 141 and 142, and

one of the contact fingers 20, 30-or 40 of the floor selector 9. may be established for the direction preference relays90 and 91*respectively, by the gate relay 101 or thetime element relay93. ,The holding circuits,106 and.107 each include a resistor 1081,

and 109, respectively, for limiting the. current in thejcorresponding holding circuit toa' value Holding circuits. 106 I and 107.

sufiicient', to; maintain the corresponding, direcation' preference relay closed when it has-been previouslyclosed in response tocompletion of a cause closure of the relay. i The, purpose of the floor relays 121,122, ,131, .132, 141 and 142- is to record the calls of prospective passengers at the floors and of passengers in thecar, until the calls are, answered. Al-

though ;for simplicity, only three sets offloor relays, corresponding to theisecond, thirdand fourthfloors, have been illustrated in Fig. 4,

it will be understood thatan up floorrelay and a "down floor relay are provided for each floor intermediate the terminal floors. A down floor relay is provided for the upper terminal floor and anup" floor relay is provided forthe lower terminal-floor. The operationof an entire set for-a system serving-five floors, includclo'singcircuit, 102, 103 or 104, but insuflicient to ing'the terminal,floor'relayajwill be hereinafter V describedin connection withFig. 5.-

Returning to Fig'. 4 the floor relays 121, '122, 131, 132, 141,.and142 are each provided with a closing coil 0, designed toclose the relay. and a demagnetizingcoil d designed to produce a magnetomotive force in opposition to the magnetomotive force of. the closing coil and sufli 'cient to cause the relay to open when the closing coil is energized andthe full voltage of-supply conductors L1 andL2 is impressed upon the demagnetizing coil; but insuflicient to cause the relay to open when ayvoltage materially less than the full voltage of supply conductors, L1

andiL2' is' impressed upon the demagnetizing coil.";--

, Closing circuits for the; up floor relays 121, 131 and 1411 may be completed through up push- buttons 123, 133 and 143,locatedat the corresponding floors, conductors 124; 134 and 144 respectively, and a conductor 155. Similar:

1y, closing circuit for the downi fioorrelays 122, 132 and 1.1142 may, .be. completed through tact brushes 61, 62 and down push buttons 125, 135 and Y145, conductors 126, 136, and 146 and the conductor .155.

Holding circuits for each of the floor relays.

121, 122, 131, 132, 141 and 142 may be completed through conductor 156, contact members oi the corresponding relay, its closing coil .c and the conductor 155. a

A plurality of car push buttons 127, 137 and 147, one corresponding to each floor served by the car, are'mounted in the car. The car pushbuttons 127, 137 and 147 may each be connected to the closing coil of'either the :up orv down floor relays for the corresponding. floor, by means of the contact fingers 21, 31 or 41, of the floor selector 9.

A pair of interlock relays 157 and 158 are provided for interlocking the direction preference relays and 91, so that the latter. cannot both be closed at the same time. The interlock relays 157 and 158 operate instantaneously. upon enerand 2R and the operating coil of a cancellation relay 166, may be completed by contact members of any of four stopping relaysv 160, 161, 162 and 163. The. coils of the stopping relays 160, 161, 162 and 163 are connected to the movable con- 63, respectively, of theffloor selector 9.

Each of the up floor relays 121, 131 and 141 is provided with contact members for connecting an extreme left contact segment 33, 43 and 53, respectively, to supply conductor L2, through conductors 167, 168 and 169," respectively, and part of the starting circuit 159. Similarly, each of the down floor relays 122, 132 and 142, is provided with contact membersfor connecting an extreme right contact segment 26, 36 and 46, respectively, to supply conductor L2, through conductors 172, 173 and 174, respectively, and part of a common circuit 156.

The operation of the system shown in Fig. 4 may be set forth as follows: Preliminary to control of the 'car in response to car or hall push buttons, the manual switches 73 and 76 are closed. Upon closure of switch 73, the induction motor 71 is connected'to the alternating current source 72 and accelerates to running speed in the usual manner. Upon closure of the switch 76, the supply conductors L1 and L2 are connected to the direct current source, and the motor field circuit 74, the starting circuit 159 and the gate circuit 100 (assuming that the car gate is open) are completed. The field winding 5] of motor 5 now builds up to its full value. The starting relay 92 operates to' open its contact members in response to completion of thestarting circuit 159. The gate preference relay 101 closes in response to completion of the gate circuit 100 to complete the holding circuits 106 and 107 for the direction preference relays 90 and 91, respectively.- The direction preference relays 90 and 91 do not close at this time, however, as the resistors 10!! and 109 limit the current to a value insufficient to operate the relays, as previously explained.

Operation of the car 1 maynow be initiated by means of the push buttons'123, 125', 127, etc.

The parts are shownin the positions they assume when the car is at the third floor, and the car gate and hatchway door for the third floor are open. If a prospective passenger enters the car at the .third floor and presses the push button 147 corresponding to the fourth fioor, a circuit for the up floor relay 141 is completed through conductor 144, the closing coil of floor relay 141 and conductor, 155.

'I'hefloor relay 141 closes to interrupt the circuit 172 by means of its lowermost contact members; to establishv a holding circuit for itself through its contact members e; to connect the contact segment 53 to the supply conductor L2 through conductor 169 and the starting circuit 159; to' interrupt the starting circuit 159 and to complete a closing circuit 104 for the up-direction preference relay 90. In response to interruption of the starting circuit 159, the starting relay 92vdrops out to close its contact members in-the up" circuit '88 and in the down" circuit 89;

Uponcompletion of the closing circuit 104, the up direction preference relay 90 closes and the interlock relay 157 operates to open its contact members in the circuit of its down direction preference relay 91. The up direction preference relay 90, in closing, partially completes a circuitior the stopping relay 161 by means of its lowermost contact members; partially completes a circuit for the stopping relay 163; and partially completes the .up" circuit 88.

If the hatchway door for the third fioor is now closed, the corresponding door contact members 97 close to partially complete the door relay circuit 96. ;If the car gate is now closed, the gate circuit 100 is interrupted at the auxiliarygatc contact members 99, and the door relay circuit 96 is completed at the gate contact members 98.

In response to interruption of the gate circuit 100 the gate preference relay 101 is deenergized but'does not immediately drop out because of its time element operation described above.- In response to completion of the door relay circuit 96, the door relay closes to complete the up circuit 88. 1

Upon completion of the up circuit 88, the

up" direction switch 78, the time element relay 93 and the brake .relay 84 close. The brake relay 84, in closing, partially completes a circuit for the release winding of the brake 6. The time element relay 93, in closing, completes the holding circuit 106 for the up direction preference relay 90, independently of contact members of the gate preference relay 101.

The "up direction switch 78- in closing, completes the speed circuit 82, the brake circuit 87 and the generator field circuit 77.

-In response to completion of the speed circuit 82, the speed switch 81 operates to open contact members in the circuit of winding 1L of the inductor relay IR and to short circuit the field resistor 80. Upon completion of the brake circuit 87, the brake 6 is released, the relay 85 closes to partially complete the stopping circuit 165 and the time element relay 86 operates to remove the short circuit from the resistor 94. The resistor 94 now limits the current in the up? circuit 88 to a value sufiicient to maintain the direction switch 78, the time element relay 93 and thebrake relay 84 operatedgbut insufiicient to' cause reclosure of any of these switches if the up circuit 88. should be interrupted and reclosede Asthe generators-field circuit His now. energized and the field resistor 80 is short-circuited, the voltage of generator 'wbuilds up to its maximum value, and the motor 5 accelerates to full speed.- .While the motor 5 1s running, thecuniulative series winding '70s of the generator 70 operatesto maintain the speed of motor 5 constant in a well k nown manner.

,rection switch 78 and the brake relay 84to drop As the car moves upwa rdly, the: moving con tact brushesv to inclusive, of the {floor selector '9 move upwardly into engagement with,

the contact segments; of the ,floor selector, 9

whichare immediately in advance of them. Uponengageme'ntof theycontact brush 61' with the contact segment}44,1 a cirouit for the stopping relay 161is completed from supply conductoriLl through thelowerrnostcontact members of the up directionpreference relay 90,

the noperatingcoil of stoppingrelay 161, contact brush 61, contact segment 44 ,I the demagnetiz ing coil d of thefioor relay-141, "contact'memvberse of the" floor relay 141, and conductor-156 to supply conductorgL2. It will be notedthat the opening coil (1 of the floorrelaylfi is in cluded in this circuit. However, the floor relay 141 does not drop out at this time; as the current in the circuit is limited bythe presenceof the operating coil of;the stopping relay 161.

,The stoppingrelay 161 closes to complete the stopping circuit 165; In response to the completion of. the stopping circuit 165 the winding 2L of the inductor relay 2B; is energized; and the cancellation relay 166 closes.

. The cancellationrelay 166, n closing, establishes'a holding circuit for itself independent of the contact members of stopping relay 161; par tially completesa circuitto the contact brush 6' 4 shorteircuits the operating coil of 'the stopping relaylfil short circuitsfthe operating coil c of. the stopping relay 162;] and partially; completes a circuit to the contact brush fif i "Upon the short circuiting of the operating coil ofthe.

stopping relay 161, the stopping relay drops out and the opening; coil (1 of the floorrelay 141 is energized sufficiently to cause ltherelay 141'to dropout. 1

a, The car continues at ,full speed until the inductorrelay 2R'arrivesf at ailposition opposite the inductor plate 2U for the fourth floor. When this occurs, the contact. members fiURof the inductor relay QR, open to interrupt thespeed' ,circuit 82. The speed switch-Blidrop's' out .to

insertthe resistor8o in the generator field cir-' cuit 7'7 and to complete a circuit for thei wjind ing 1L of the inductor relay 1R.

the inductorr'elay. 1R opens to interrupt the up circuit 88 tothereby cause the up? diout The time element may 93 1s now deen- ,ergized, but does not immediately'drop out because of its time element feature,"mentio'ned above The brake relay 84 in dropping out, in-p Lterrupts the"ci rcuit of the release winding of I brake 6; to

-plied tv we '1 c The up direction switch 78,;in dropping out; interrupts the generator fieldpcircu'iti'l'lt and the thereby'fcause the brake to heap- .The generator voltage is .lay 91 may be completed in response tofoperation or any 'of the floor relays for floors,below.the fourth fioor.-j;

for .the,:1ifth fioor the sequence :of operations brake icircuit 8'7 and opens its contact members in the speed circuit 82, which has .already been interrupted by the contact members 2UR; of the" inductortrelay'2R'. a v p a now reduced to zero, andthe motor 5 is rapidly brought toirestjgby the'action ofithe brake 6. The car is now at the fourth floor. If, during the two-second interval before the' time element relay 93 opens,

the passenger 'in'lthe elevatoricar opens the car gate, the up direction preference will bemain- 106, and thecarmayb'e operated ineither direction in response'to furthervcallsl.

tained; If, however, the passenger does not open the car gate before thetime element re1ay" 9 3 drops out, the lup direction preference willibe 'lost by the interruption {of theholding circuit t Assuming that the p'assengerfopens the .car

gatewithin the time limit determined by time element relay 93, the gatecircuit isccOmholding a circuit 106, independently of contact members of the time relement'r'elay 93. Thefup direction preference will then. be maintained uncvplete d at auxiliary contactrnembers 99, and the gate preference relay 101 closes'ito maintainthe c c 100 tilthe 'car gate hasbeen closed andfthetwo' second interval necessary for operation of the gate preference relay 101 has expired. If at any time during this, interval, calls f for floors above the fourthare registeredthecarwwill start upwardly. Ifne such'calls are registered before the gate preference relay 101 dropsl'o'ut, then the 1 circuit for the .down direction preference re- It willbe notedth'atf contact brushfilcupon engagement with an energized segment 44' of the floor selector '9 initiated a stopping operation of V the elevator carat the nexts'uccee'ding(floor, and

also completed a circuitfor deenergizing the floor relayj141'for the up direction.- The contactibrush' 6 2, performs a, similar function of stopping the car in responseto fdownfl calls a when the car is moving downwardlyand orcancellingth'e down" calls by de'ene'rgizing the 'corresponding fdown",floor;relays'. The contact brush 60 performs the function of" initiating a stopping operation; for I the car. in response to j 'up calls when theicarnis moving downwardly.

The contact jbrush I65 operates to cancel up j callswhen the car is moving downwardly. -The contact brush63 operates similarlyto th'e'contact brush60,except that it causes the car. to

stop in. -response to down calls when the car is moving rupwardly. The icontact brush 64 01)- 'erates. to cancel down calls '.whenthe car; is moving upwardly in a manner similar to contact brush65- H t, n t

Turning now to'Fig. 5,which shows the 'set of floor relays-forth'e second, third and 'fourth floors, and also a terminalfloor relay 111; .for

the first floor and ,a terminal floor relay 152 upon the'o'ccurrence of a pluralityof callsmay i The parts are shown in positions they ase sume when the cart is at the third noon. Assuming" that thecanbut'ton 147 has been pressed-te a initiate'the operation of the elevator car in the how be explained; In Fig. 5,r,the functions a V the contactblllshs some 65 finc1 us'ive'-are indii edby legends, r r 7 up directiomas described ir'rconnection with Fig. 4, andthat shortly after thelcar hasfstart de upwardly in the manner'jide'scribed, the pushrbut- 15o AL V tons 123, 133, 135 and 153 are simultaneously operated, the sequence of operations is as follows: In response to closure of the push button 123, the floor relay 121 closes and completes a holding circuit for itself in the manner previously described in connection with floor relay 141. The floor relays 131, 132 and 152 close similarly. p,

The floor relays 121, 131, and 141 are now closed in response to up calls for the second, third, and fourth floors, the floor relays 132 and 152 are closed in response to"down calls for the third and fifth floors," and the car is between the third and fourth floors moving upwardly. The contact segments 24, 34, 44 and 54 are now connected-at the supply conductor L1 through the opening coils of the floor relays 121, 131, 141 and .152, respectively. The contact segment 33. is connected to the supply conductor L2 throughcontact members of floor relay 121, conductor 16'! and the startingcircuit 159. The contact segments 43 and 53 are not similarly energized, however, as the'iloor relay 121 has interrupted the starting circuit 159 at a point in advance of the conductors 168 and;169. The contact segment 45 is connected to the supply conductor L2 through the demagnetizing coil of the down" floor relay 132. However, the contact segment 36 is not connected to the supply conductor L2, as the circuit 156 is interrupted at a point in advance of the conductor 173.

As the car moves upwardly, the contact brush 61 engages the contact segment 44 to initiate an automatic stopping operation at the fourth floor in a manner described in connection with Fig. 4. As a call for the fifth flooris registered, the up" direction preference is not lost, and upon restarting of the car, the direction of movement will be upwardly. 7

After the call at the fourth floor has been answered, the car accordingly moves upwardly until the contact brush 61 engages the energized contact segment 54. An automatic stopping operation similar to that described is now initiated for the fifth floor. When the car arrives at the fifth floor, as no calls for floors above the fifth can be registered, the "up direction preference is lost, the "up direction preference relay drops out, and a circuit for the down direction preference relay 91 is completed throughone of the closing circuits 102 'eration in the the floor for which the call is registered.

The car then starts downwardly and continues downwardly until the contact 62 engages the energized contact segment '45. When this occurs, an automatic stopping operation for the third floor is initiated, and thecar is brought' to rest at the third floor in the same manner as heretofore described in connection with the stopping operation at the fourth floor.

After the call for the third floor has been answered, the car starts downwardly as the "down direction preference is maintained by the "up" .floor relay 121. It will ,be noted that both up" and down" fioorrelays are effective to initiate a starting operation in the down direction; if the car is above the floor for which.

the call is registered. Similarly, both up and down floor relays may initiate a starting opup direction if the car is below As the floor relay 121 is closed'the car starts in the downward direction, and answers the "up" call corresponding'to the up" floor relay 121 for the second floor in preference to the up call corresponding to the up" floor relay 131 for the third floor.

After the call for the second floor has been answered, in the manner previously described, and the up floor relay 121 has been deenergized, the only remaining call is the corresponding to the up floor relay 131 for the third floor. The down direction preference is accordingly lost, and the car restarts in the up direction to answer the up call corresponding to the up? floor relay 131. When the up" floor relay 131 drops out, all of the calls have been answered and the up direction preference is maintained for a two-second interval by the time element relay 93. After the expiration of the two-second interval, the car may be operated in either direction in response to further calls. 7

I do not intend that the present invention shall be restricted to the specific structural details, arrangement of parts, or circuit connections herein set forth, as'various modifications thereof may be effected without departing from the spirit and scope of my invention. I desire therefore that only such limitations shall be imposed as are indicated in the appended claims.

I claim as my invention:

1. In an elevator-control system, an elevator car operable in a hatchway past a plurality of floors; motive means for said car; a plurality of floor relays corresponding to said floors, each. of said floor relays having a closing coil, an opening coil and means effective upon energizetion of said closing coil for completing a holding circuit for said relay and effective upon energization of said opening coil for interrupting said holding circuit; means for selectively energizing said closing coils to register calls for said car; starting meansfor controlling said motive means to start said car; stopping means for controlling said motive means to stop said car at floors for wihch calls have been registered; direction preference means for causing said starting means, when operated,'to start said car in the .direction in which it last travelled; means for rendering said preference means ineffective when said car is at any of said floors and no calls are registered forfioors in advance of said car in the direction in which it last travelled; and means eiiective upon operation of said stopping means for'energizing the opening coil of a floor relay corresponding stops."

2, In an elevator-control system, an elevator car operable in a hatchway past a plurality of floors; motive means for said car; a plurality of floor relays corresponding to said floors, each of said floor relays having a closing coil, and opening coil and means effective upon energization of said closing coil for completing aholding to the floor at which said car circuit for the relay and effective upon energizetion' of said opening coil for interrupting said holding circuit; means for selectively energizing said closing coils toregister calls for said car; starting means controlled by said floor relays for controlling said motive means to start said car in the direction of a floor for which a call has been registered; stopping means for controlling said motive means to stop saidlcar at floors for which calls have been registered; direction preference means for controlling said starting means to give preference to calls for floors in advance of said car in the direction in which it last travelled; means for rendering said preference means ineffective when said car is at any of said floors andno calls are registered for floors in advance of said car in the direction in which it last travelled; and means efiective upon operation of said stopping means'for energizing the openingcoil of a' floor relaycorresponding to the floor at whichsaid car stops.

3. In I an elevator-control system, an elevator car operable in a hatchway past'a plurality of floors; motive means for said car; a plurality of floor relays corresponding to said floo'rs, each of said floor relays having a closing coil, an opening coil and means 'efiective upon,energization of said closingicoil for completing a holding circuit'for the relay'and efiective upon energization of said opening coil for interrupting said holding circuit; meansfor selectively energizing said closing coils to register calls for said car; startingmeans controlled by said floor relays for controlling said motive means to start'said car vin the direction of a floorf forwhich a call has been registered; means for preventing operation of said starting means while said car isibeing loaded orlunloaded; stopping means for controlling saidmotive means to stop said car at floors ;f0r which-'callshave beenregistered; di-

rection preference means for controlling said a starting means -to give preference to calls for the opening coil of a floor relay corresponding to the floor at which said car stops.

4. In an elevator-controls system, an elevator .car operable in a hatchway past a plurality of floors; motive means for said car; a plurality 'of floor relays corresponding to said floors, each of said flow relays having a closing cell, an

, opening coiland means efiectiveupon energization of said closing coil to complete aholding circuit for the relay and effective upon energization of said opening coil to break said holding circuit; means for selectively energizing said closing coils to register calls for said car; starting means controlled by said floor relays for controlling said motive means to start said car in the direction of a floor for which a call has been a registered; stopping means for controlling said motive means to stop said car at floors for which calls have been registered; direction preference means'for controlling said starting means to give preference to calls for floors in advance of said car in the direction inwhich'it last travelled;

means for preventing operation of said starting means for a predetermined interval of time after operation of said stopping means; means for rendering said preference means ineflective when said car is at any of saidfloors and no calls are registered for floors in advance of said car in the direction in which it last travelled; and

means effective upon-operation of said stopping means for energizing the opening coil of a floor relay corresponding tothefloor at which said 7 car stops. t r

- WILLIAM E. EAME S.

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