US1930512A - Elevator control system - Google Patents

Description

Oct. 17, 1933; w. F. EAMES 1,930,512

. ELEVATOR CONTROL SYSTEM Filed on. 11.1929 4Sheets-Sheet 1 INVENTOR AT'TORNEY Oct. 17, 1933- w EAMES 1,930,512

ELEVATOR CONTROL SYSTEM Filed Oct: 11, 1929 4 Sheets-Sheet 2 L/ 4? I lNvENTo R f1 gfZ. MY/[am/T'E'ames.

AT'TORNEY Oct. 17, 1933. EAMES 1,930,512

' ELEVATOR CONTROL SYSTEM I Filed Oct. 11, 1929 4 Sheets-Sheet 3 INVENTOR F7? 3 Mll/bmFE ames.

A'TTORNEY Oct. 17, 1933. w E EAM'ES I 1,930,512

ELEVATQR CONTROL SYSTEM Filed Oct. 11. 1929 4 Sheets-Sheet 4 F297 INVENTOR MflllbmFEamw I B I ATTORNEY Patented Oct. '17, 3

UNITED STA 1,9so,512 I ELEVATOR oo s'rnor. srs'rmm William F. Eames, Edgewood, Pat, asslgnor to Westinghouse Electric & Manufacturing Company, a corporation of- Pennsylvania Application October 11, 1929. 'SerlalNo. 898.941

12 Claims. (cl. 1875-29) My invention relates to control systems 101' elevators and more particularly to control'systems in which the elevator cars are started by car switches and are stopped by the operation of push buttons in the cars or at the landings. jOne object of my invention is to provide for maintaining a control pushcbutton in its de pressed position. after" it has been operated, until a car hasstarted to answer the call, tov thereby indicate that the button has been depressed toafter they are depressed, so that passengers at .A further object of my invention is to providea fully-selective elevator-control system; that is, a system in which a registered call will be canof apparatus that are usually required in elevoter-control systems or the above-designated character.

It is also an object of my invention to provide an elevator control system in which. the car may be operated at express speed but be auto- -cel1ed the instant-that a car starts to answer for reducing the wiring and the number of pieces matically reduced from its express speed. to itsf normal working speed as it approaches a landing for which a stop call has been registered. so thatit may arrive within the stopping zone at such speed as to come to rest exactly level with the.

floor landing.

Other objects or the more. wiilpin pigs,

obvious and will, in part, appear hereinadter.

reference may he. hadto the following descrip For a compiete understanding of the invention...

tion, taken in connection with the accompanyingdrawings, in which;

Figures 1, 2, ii and 4 collectively constitutes diagrammatic representation of the controi'cir cuits and apparatus embodying my invention; as

applied to an elevator system.

The drawings illustrate a pair of elevator cars.

A and B as suitably suspended by cablesCa and Co which pass over the 'D and' b' f ant thereon.

to suitable counterweights ow and cw, reg spectively. g

- Inasmuch as the control systems for the cars A and B are alike, only the control system for car A will'be described. 69

The hoisting drum D for the car A isdirectly coupled to an armature EM'- 0! an elevator motor EM, the field winding EMF of which is con-5 nected, for constant-voltage energiz'ation, toa' source oipower-designated as tors L1 and L2. i

A- variable-voltage system of control-may be provided for operating the hoisting motor EM wherein the armature EM isconnected in loop circuit with the armature G 01' a generatorG; 70;: The generator G is provided with a separatelyv excited field winding GF and a cumulative series field winding GSF. v p

The armature G 01' the generator G is suit ably driven by means of a driving motor M illustrated as being of the shunt-wound type having its armature M and. its field winding M1! 7 connected, in shunt relation to the supply conductors L1 and- L2.

The direction and speed of the hoisting motor EM may be suitably controlled by controlling the direction and value of the elicitation current that is supplied to the separately excited field winding'GF of thef'generator G.

4 The direction of the excitation current-for the field winding; GE may be suitably controlled by means of an lip-direction switch 1 and w down-direction switch 2', while the value of the current supplied to the field winding may be controlled by means of an intermediate-speed relay ii, a normal orhigh-s peed relay 4 and an express relay 6. The operation ofthe up -direction and down direction switches 1. and 2, as well as the inter mediate-speed relay 3 and the normal highspeed relays may be controlled by means 'of a car sw'ii'leh'ififilt that is mounted upon; the car A in position to be actuated by 'an attend- An express-speed switch Si is provided forcon trollling the express-speed relay- 5. The switch;

emery be disposed at any suitable point where' a "dispatcher" in charge of the elevators may close theswitch to speed up the operation of-f the car-Ant any time desired. For instancel"ii the high speed, that is, the normal working? speed of the car. is, say, 700 teet'per minute the: dispatcher" may cause it to operate" at an express speed 0!, say, 800 feet per minute.

the supply conduc- 65 I A w h? B is connected in'the elevator control system in such manner that it will deenergize the express-speed relay 5 to decelerate the car rom express speed to high speed; that is, its normal working speed, when the car nears a landing at which it will be stopped by a registered call.

A relay 7 is connected across the loop circuit of the motor EM and is provided with contact members that open or close gaps in the energized circuits for the high-speed relay 4 and the express-speed relay 5, in accordance with the voltage of the generator G, thereby delaying the energization of the relays 4 and 5 until the generator voltage reaches a predetermined value and thus preventing the car from being operated in a jerky manner.

Any suitable means may be employed which will, when energized, automatically stop the car A level with the floors past which it moves. In the present instance, I have illustrated the stopping means as including an automatic inductor landing system, such as is disclosed in the copending application of E. M. Bouton, Serial No. 731,921, filed- August 14, 1924 and assigned to the Westinghouse Electric &- Manufacturing Comm y- -The inductor landing system for the car A includes an up-high-spee'd inductor relay HU,

and up-intermediate-speed inductor relay SU and a stopping inductor relay S for causing the car to be automatically decelerated from its high and intermediate speeds, respectively, and brought to a stop at an exact level with a floor when the caris travelling upwardly. Similarly, d'own-high-speed inductor relay HD, a downintermediate-speed inductor relay SD and the stopping inductor relay S will cause the car to slow down and stop at the floors when it is travelling downwardly.- i

It is assumed that each of the floors past which the car A moves will be provided with a set of inductor plates that will cooperate with the inductor relays as the car approaches predetermined points in advance of the floor atv which a stop is tobe made to effect the operation of the relays.

'I'he inductor plates associated with any one floor for the car A are illustrated'as comprising an up-high-speed inductor plate HU', anup-in termediate-speed inductor plate SU and a stop- .pi'ng inductor plate S for successively operating the rip-inductor relays HU, SU and S as the car makes an up stop. When the car is travelling-downwardly, a high-speed inductor plate HD', an intermediate-speed inductor plate SD and a stopping'inductor plate S will successivelyoperate the inductor relays HD, SD and S, respectively, as the car approaches a down stop.

In the elevator system illustrated in the drawings, the energization of the inductor relays on each car for stopping that\' car is effected by a control relay that is operated by a plurality of associated floor relays. Thus, the stopping of the car may be controlled by the floor relays.

The floor relays, in turn, are controlled by push,

buttons in the cars and at the floor landings. With this arrangement of apparatus, the operation 01 a push button at a floor landing will cause a car running in a corresponding direction to stop at that landing, while the operation of a'push button in a car will cause that car to stop at the landing represented by that push, button.

Inasmuch as the present system is of the high-' speed type in which the normal slow-down dis tance of the cars is greater than the distance between two adjacent floors, two pairs of floor relays are-"provided for each car, one pair for operating the control relay when the car is to be decelerated from its normal high speed to a stop at a landing more than one floor away and the other pair for energizing the controller relay when the caris standing at one floor and is to make a stop at the next floor.

As shown, the control relay for the car A is RI=is energized by the push buttons in car A when the car is to be decelerated from high speed to a stop at a floor.-

R2=is energized by the floor push buttons when the car is to be decelerated from high speed to a stop at a floor.

Gl=is energized by the push buttons in car A when a one-floor run is to be made.

G2=is energized by the floor push buttons when a one-floor run is to be made.

The push buttons disposed in the car A to be operated by the car attendant when he desires to register or set up calls that will cause the car to stop at the floors where passengers desire to get off, are designated as A.--2, A-3 and A8.

Similar push buttons B-2, B3 and B8 are disposed in the car B to enable the attendant in that car to stop at any landing to discharge passengers.

, The push buttons disposed at the floor landings to enable waiting passengers to register or set up calls that will cause the first car to approach in a corresponding direction to stop thereat so that they may board it are designated as follows:

The up and the down buttons for the second floor are respectively numbered 2U and 2-D while those for the third and eighth floors are designated as 3-U and 3-D and BU and 8.D.

For the purpose of signalling a passenger wait ing at a floorlanding that a car approaching in the direction in which he desires to go will make a stop at his landing, each car is electrically connected to indicating devices, preferably electric lamps, which are mounted outside of the elevator shafts at the floor landings. Each of the top and bottom floors is provided with a single lamp or floor lantern for each car, while each of the intermediate floors is provided with a pair of lanterns for each car, one serving to indicate that the corresponding car is approaching in a downward direction and the other in an upward direction. The floor lanterns for the car A are The floor lanterns for the car B are desig- I emplate in maritime with the son oils of the cars with respectto'the associated floors, the

car Ais provided witlia floor selector FS and thecar" B'with a floor selector BFS. The floor selectors may be located at any suitable point, such, for example, as in the pent house or in the elevator shafts and, as illustrated, are simtilar to those usually employed in elevator systems.

As1sh own, the selector F5 for the car A is provided'with a set of up contact segments and a set of down contact segments that are disposed to be engaged by cooperating brushes 10 to'27, inclusive, mounted upon, and insulated from, a movable arm MA;

. Tlie movable arm MA is operated in accordance with the movements of the car A by means of a screw AS that is driven by some part of the operating mechanism of the car which the selector serves. f

Usuallmithe -frictional engagement between arm MA and its operating screw AS will cause the arm to bear upon the up contact segments wherrthe 'car 'is travelling upwardly and upon the down contact segments when the-car is travelling downwardly. However, in the present system, it isdesirable, to have the movable arm MA tilted to the opposite side as soon as the "'car reaches the limit or its up and'down travel.

Therefore, the selector is provided'witha pair offelectromagnets 30 and 31 that'may be energized to cause'the arm MA to tilt in the proper direction upon reaching the end of its travel. The 'electromagnets so and 31 may be energiz'ed to tilt the movable, arm MA when the car l a"down*,"se1ector relay'33, which, in turn, are

' the brushes 1G,.Illand12 control the lighting of theup floor lanterns to indicate'to waiting controlledb'yf a air of limit switchest and. as. The] group oi. upf' contact segments under passengers that the car will stop for them. I

' g'roup" oi flip"v contactsegments under tons, and the group" of 'fup" contactfisegments undefthe'brushes l6, l'l'and 18 connect the car buttons. with the floor, relays for stopping the GIG-r. Ir-". I all; ,1. I. s LAs shown, ,the brushes ;1o, 11' and12 for the up floor-iantern'segmerit sare so disposed on the arm MA that the high-speed brush 10 "will engage the? 'fioor-lanternseghi'ent for a floor when, the, car is two floors away from that floor,

" the intermediate-speedbrush 11 will engage the segment ,when the car is one floor away and the brush 12 will be in engagement with the segwant when the car is standing,-thus providing means whereby an energized segment will keep a fioqr lantern lighted whtle a, car decelerates from highspeed tb 'a stop at afioor and remains The express-brush i s term "up?" floor-but ten segments is so disposed entire arm MA. that it. will engage the floor-button segment" for-Ia coir when thecar isapproidmately three floors from that floors, The express brush 13 is connected inthecirouit ioi" the coil of the express control relay 6. Therefore, when the ex: press brush i3 'comesjintof engagement with a when segment that has energized bythe registration of a stop call. it'wil1 energize the relay 6 tohopen the circuit tor the express relay 5.

line conductor L2;

the car to decelerate from its express speed to its normal-speed so that it will be running at such speed; when .it picks up the registered stop call, that it will be stopped exact-1y level with the floor for which the registered stop call exists. I'he brushes 14 and- 15 for the up floor-button segments are disposed on the arm MA in such manner that the'high-speed brush 14 will engage thefloor-button segment fora floor when the car is approximately two floorsaway from that floor, and the'standing brush 15 will be in-engagement with the segment when the car is one floor away, thus providing separate circuits for operating the hi gh-speed fioor relay and the low-speedor standing floor relay associated with the car B'is similar, inall respects, to that de-- 2D, 3U, 3D and 8U and 8D instead oi toa sep-q arate set of'fioor push buttons; Therefore the push buttons 2U, 2D, 3U, 3D and 8U and 8D are common to both the cars A and B and the pressing of any one button will energize the floor. 4 button contact segments of both cars to cause the first car to approach in a corresponding direction to stop at the floor at which the button I has been pressed. x

My, invention may behest understood from an assumed operation of the apparatus represented in the drawings.

[Assuming that the car B is standing at the upper landing; that the car A is standing at the first floor landing ready to start upwardly and that a passenger waiting at the second floor presses the up" button 2U to register a stop call that will cause a car to stop at the second floor, then the operation of the push button 2U closes a self holding circuit for itself that extends from the supply conductor Ll, through conductor 40, the contact-members of button 2U, holding coil 41 and -conductorea to supply conductor L2.

Inasmuch as the car A is standing at the floor below'that door" at which the stop call exists, the'pressing oi the button 2U also completes a the car to stop at the second floor, which circuit extends from supply conductor L1, through eon ductor so, the contact members of push button j 2U, conductor e3, restoring coil 44, conductor 45, contact segment as, brush '15, conductors i7 and as, the contact members I of up-direction switch 1,, conductor 49, thec'ontact members I of down-direction switch 2, conductor-50, the

coil of relay-G2 and conductors 51 and 52,.to

circuit'ior energizing the floor relay G2 to cause The closing of the contact members on the floor relay G2 completes a circuit for energizing the control relay Co to thereby efiect the restoration of the push button 2U, the lighting of the floor lantern L2U, and the energization of the inductor relays to stop the car at the second floor, which circuit extends from line conductor L1, through conductors 55 and 56,

the contact members of stopping inductor relay S, conductors 57 and 58, the coil of relay Co, conductors 59 and 60, the contact members a of relay G2 and conductors 61, 62 and 52, to

v supply conductor L2.

The closing of the contact members a on the control relay Co completes a self-holding circuit for that relay which extends from the Supply conductor L1, through conductor 55, as just described, to the coil, of the relay Co and thence, through the contact members a thereof and conductors 63 and 64, to supply conductor L2.

The closing of the contact members 0 on the control relay Co completes a circuit tor-fully energizing the restoring coil 44 to! restore the floor push button 2U to its open position, which circuit extends from the supply conductor L1, through conductor 40, the contact members of push button 2U, conductor 43, restoring coil 44,

v on the push button 2U are wound in oppositionto each other so as to oppose each other magnetically. Therefore, when the restoring coil 44 is fully energized, it has sufficient magnetic force to neutralize the magnetic force of the holding coi1'4l, thereby causing it to release the push button to its normal open position. Thus, the push button 2U will be restored to its open position to make it ready for future operation and to prevent the registered stop call from being picked up by any other car when full current is supplied to the restoring coil 44. When the restoring coil 44 was in series with the coil of the floor' relay G2, during the energization of that relay, there was suflicient resistance in the coil of relay G2 to prevent the restoring coil 44 from being sufiiciently energized to magnetically overcome the holding coil 41.

The floor relay G2 is deenergized when the contact members -on the push button 2U are opened.

It should be noted here that the push button 2U is restored to its open position as soon as the relays G2 and Co operate, because the car A is at the next floor below, with its car switch 05.4. in a centered position. If no car were standing atthe next floor below, the restoring coil 44 would not be fully energized until a car came to, and stopped at, the lower terminal. Hence, in the absence of a car at the lower terminal, the push button 2U would have remained in its depressed position until a car arrived, thus indicating to the waiting passenger, at the second'floorthat the stop calfwas registered.

The opening. of the contact members 9 on the control relay Co opens the circuit to the coil of the high-speed relay 4 and thereby preventsthe car from running at high speed, so that it may 'makea one-floor run to the second floor. Further explanation oi the operation of the control relay Co will be deferred until the starting of the car by the car attendant is described. I

Assuming now that the attendant on the car A decides to make an up run, under our assumed condition of operation, he will start the car from the first floor in the usual manner by operating the car switch CSA in a clockwise direction to full-speed position and then returning it to its control position. v In the control system illustrated in the drawings, the attendant will normally throw the car switch all the way over to its high-speed position, hold it there for a short period to permit the various relays to pick up and then recenter it, so that the car will be stopped at any floor by its inductor relays when they are energized as a result 01" the' operation of the push buttons at the floor landings or in the car. If the car switch is held in its high-speed position, the inductor relays cannot be energized, and the car 'will run through its stop ca1ls.- I

The movement of the car switch CSA in the clockwise direction completes a circuit for energizing the up-direction switch 1 to start'the car upwardly, which circuit extends from supply conductor L1, through conductors 55 and 56, the contact members of inductor relay S, conductors 57 and 68, the coil of rip-direction switch 1. conductor 69, the contact members 70, 71 and 72 of car switch CSA and conductors 73 and 42, to supply conductor L2.

The closing of the contact members a on the up-direction switch 1 completes a sell-holding circuit for that switch which extends from supply conductor L1 to the coil of up-direction switch 1, as justdescribed, and thence through conductor 74, the contact members a of up-direction switch 1 and conductors 75 and 76, to supply conductor L2.

The closing of the contact members b and c on theiup-direction switch 1 energizes the field winding GF of the generator G with current in one direction by way of a circuit that extends from supply conductor L1, through conductors 77 and 78, the contact members b of up-direction switch 1, conductors 79 and 80, the field winding GF, conductors 81 and 82, the contact members 0 of up-direction switch 1, conductors 83 and 84, resistor sections r1, 1'2 and 1'3 and conductor 85, to supply conductor L2.

The energization of the field winding GF causes the generator G to supply current in one direction to the hoisting motor. EM, and the car starts upwardly.

As the attendant continues the movement of the car switch CSA in a clockwise direction, a circuit is completed for energizing the intermediate-speed relay 3 for causing the car to operate at its intermediate speed. which circuit extends from supply conductor L1, through conductors 55, 56 and 87, the contact members of inductor relay SD, conductor 88, the contact members of inductorgrelay SU, conductor 89, the coil of high speed relay 3, conductors and 91, the contact members 92,. 71 and 72 of car switch CSA and conductors 73 and 42, to supply conductor L2.,

The closing of the contact members a on th intermediate-speed relay 3 completes a self-holdin'g circuit for that relay extending from supply conductor L1 to the coil of relay 3, as Just described, and thence, through the contact memscl- ' through the contact members 9 on the floor contered the car switch GSA, we will again take up ay. 3 W l b gized f Operating eta .the operations. effected by the energizing of the up ar y a intermediate p PTeVlOuBly the second floor, which circuit extends from supgized when the next stop is to be made.

section 13 from the circuit previously traced for the floor lantern L2U-to be lighted when the car the field winding GF to thereby cause the car A was at the first floor and to'thereafter remain totravel at a higher speed. lighted while the car ran to, and stopped at, the The final movement of the car switch CSA to second floor. The floor lantern will staylightits high-speed position closes its contact memed while the car remains at the second floor, but hers for the high-speed relay4 but, inasmuch will be extinguished when the contact members as the circuit for the relay 4 must be completed 101 and 72 on the car switch GSA are separated by the operation-of that switch to start the car. trol relay Co, which are now open because that I Assumingnow that the waiting passenger at relay is energized, the car will not get into high the second floor has boarded the car and that speed and will operate only at its intermediate the attendant again starts the car upwardly by Speed so that it may be stopped at the second moving the car switch CSA- in a clockwise difloor by the inductor relays. rection toits lull-speed position, then the nir- Assuming that the car attendant hasre-cendirection switch 1 and t e intermediate-speed control relay Co.

The closing of the contact members '1) on the Ina much as 110 t p call is r i ter d or excontrol relay Co completes a circuit for energiz ists for the next fioor the Co ac mem r 0 ing the slow-down and stopping inductor relays on the control relay Co are closed. Therefore, HU, SU and S on the car A to stop the car at when the car switch is moved to iuli-speed position, a circuit will also be completed for en ply conductor L1, through conductors 55 and 50, ergizing the high-spee -relay t o p a e the the coil of stopping relay S, conductors and car at high speed, which circuit extends from 96, in parallel through the coils SU and HU, supply Conductor L1, through conductors 55, 56100 conductor 97, the contact members d of up-diand 115, the contact members of inductor rerection switch 1, conductors 98 and 99, the conlay HD, conductor 116, the contact members of tact members b of relay Co, conductor 100, the indu tor Telay Conductor the 0011 of contact members 101, 71 and '72 of car switch g -Sp d e a 0010111101301 118, e C CSA and conductors 73 and 42, to supply conmembers a of voltage relay '2, conductor 119, the ductor L2. 7 contact members g of control relay Co, conduc- The energization of the inductor relays SU to Contact members 121} 71 and 72 of the and 3 causes them ,t be actuated to open their car switch CSA 'and conductors 73 and 42 to contact members as they pass the inductor plates upp y Co ducto L2- so and s' and thereby open the circuits for The closin o t Contact members a o the the intermediate-speed relay 3 and the up-direcp ed relay 4 Comp es a holding ci cu tion switch 1, thus deenergizing the relay 3 and for t at rela t nd m pp ondu t the lip-direction switch 1 and bringing the car L1 to e coi o e a as J' described, a to a stop at the second floor. thence, through conductor 125, the contact The opening of the contact members on the m mb s a f r ay 4, conductors 126, 93'a inductor relay S also deenergizes the control to pp y Conductor relay Co and renders it ready to be again enerdescribed.

The closing of the contact members I) on the high-speed relay 4 serves to shunt the resistor When the control relay Co was energized the section 72 from the circuit previously traced for closing of its contact members f completed a h field Winding GF to thereby cause the to circuit for lighting the floor lantern L2U at the t av at high p 4 seeond floor for indicating to the waiting pas- Assuming n vtihat th d pa i a e senger at that floor that the car would stop of the ato st closes the p ssp d thereat, which circuit extended from supply conswitch 9 to speedup t Operation of the & ductor L1, through conductors 5s and 105, lamp A so that it will return to t terminates 80011 LZU, conductor 106, contact, segment 107, brush as p e, en the e press relay 5 w be 11, conductor. 108, the contact members g of energized to operate the carat its express speed high-speed. relay 4, conductor 109, the contact y y Of a,0i!011it that extends from pp members d of intermediate speed relay 3, conconductor L1, through conductor 55, the disductor 110, the contact members I of relay C0, p ng Switch 9, conductor 127, the coil of reconductor 100, contact members 101, 71 and '72 y 5, 6011011101101 the Contact members 0 Of or car switch csA and conductors 73 and 42, to r ay 6, ondu 129, h C t members b supply, conductor L2. of voltage relay '7 and conductor 94, to supply As the car A approached, and stopped at the second floor, the arm MA on the floor selector FS movedto such position that thestand- I ing brush 12 engaged the contact segment 107 and, therefore, the circuit for lighting the floor lantern L2U was transferred from the lowspeed brush 11 to the standing brush 12, which circuit now extends from the supply conductor L1 to the contact segment 107, as just described, and thence, through the brush 12, conductor 111, the normally closed contact members c of intermediate-speed relay 3, conductor 100, the contact members 101, Z1 and 72 of car switch CSA and conductors 73 and 42, to supply conductor L2.

Thus, the arrangement of the intermediatespeed brush 11 and the standing brush 12 caused conductor L2.

The closing of the contact members on the express relay 5 serves to'shunt the resistor, section 11 from ,the circuit previously traced for the field winding GF, thereby allowing full line voltage to be supplied to the winding GF to cause the car to travel at full express speed.

Assuming now that a passenger waiting at the eighth floor landing pressed the up button 8U as the car A left the first floor to answer the second flcorcall and thereby registered a stop call for stopping a car at the eighth floor, then the pressing of the button 8U energized the holding coil 130 for maintaining the button 8U in a depressed position by way or a circuit that extends from supply conductor L1, through conductor 131, the contact members of button 8U,

maintain the button 8U in its depressed position to indicate to waiting passengers at the eighth floor that the button has been operated and that an up stop call at the eighth floor is registered.

The maintenance of the button 8U .in its pressed condition will also cause current to be supplied to the contact segment 132 on the floor selector FS and to the contact segment 124 on the floor selector BFS for energizing the high speed floor relay- R2 for the first car to ap proach the eighth floor in the up direction in order to stop that car at the eighth floor. However, as before stated, car B is at the top landing and car A is moving upwardly. Therefore, car A'will be the first car to approach the registered call at the eighth floor and it will be stopped at that floor. As the car A approaches the eighth floor stop at express speed, the movable arm MA on the floor selector FS will cause the express brush 13 to engage the energized contact segment 132 in advance and thereby energize the express control relay 6 to decelerate the car from its express speed to its high speed by way of a circuit which extends from supply conductor L1, through conductor 131, the

contact members of floor button 8U, restoringcoil 133, conductor 134, contact segment 132,

brush 13, conductor 135, the coil of relay 6, and

a of relay 5 to open and thus reinsert the resistor section T1 in the circuit for the field winding GF of the generator G to thereby slow down the car A to its normal high speed.

As the car A continues its approach to the eighth floor, the floor selector arm MA causes the high-speed brush 14 to engage the energized contact segment 132 and thereby complete a circuit for energizing the floor relay R2 to stop the car A at the eighth floor, which circuit extends from supply conductor L1, through conductor- 131, the contact members of floor button 8U, the restoring coil 133, conductor 134, contact segment 132, brush 14, conductor 142, the coil of relay R2 and conductors 143 and 64, to supply conductor L2.

The closing of the contact members of the floor relay R2 completes a circuit for energizing the control relay Co, which circuit exten ds from the supply conductor L1, through conductors 55 and 56, the contact members of inductor relay S, conductors 57 and 58, the coil of relay Co, conductor 59, the contact members of relay R2 and conductors. 144, 145 supply conductor L2.

The closing of the contact membeisa. of the relay Co completes a self-holding circuit for that relay extending from supply conductor L1 to the coil of relay Co, as just described, and then, through the contact members a of relay Co and conductors 63 and 64, to supply conductor L2.

and 64, to 4 the holding coil 130' and conductor 42, to supply The closing of the contact members b on the control relay Co,completes a circuit for energizing the inductor relays HU, SU and S on the car A for stopping the car at the eighth floor, as previously described.

As the car passes the eighth floor inductor plate HU, the energized inductor relay HU will be actuated to open its contact members and thereby open the holding circuit for the high-speed relay 4 to automatically slow down the car to intermediate speed.

As the car continues toward the eighth-floor 'level, the energized inductor relay SU passes the eighth-floor inductor plate SU' and isactuated to open its contact members to deenergize the intermediate-speed relay 3 for automatically bringing the car to a still lower speed as it approaches the point at which the power should be shut ofi.

As the car continues toward the eighth-floor level, the energized stopping inductor relay S passes the inductor plate S and is actuated thereby to open the circuit to the up-direction switch 1 for deenergizing the generator winding GF and bringing the car to a stop at the eighth floor. The opening of the contact members on the inductor relay S also deenergizes the control relay Co.

The opening of the contact members on the stop inductor relay S also deenergizes the holding' circuit for the express control relay 6, thereby restoring that relay to its normal condition in which its contact members a are closed to permit the express relay 5 to be again energized.

When the control relay Co was energized as the car approached the eighth floor, the closing of its contact members 0 restored the push button 8U to its normal open position by completing a circuit in shunt with the floor relay R2 to permit full current to be applied to the restoring coil 133 and cause it to overcome the holding coil 130, which circuit extends from supply conductor L1, through conductor 131, the contact members of push button 8U, restoring coil 133, conductor 134, contact segment 132, brush 14, conductors 142 and 137, the contact members I of relay 4, conductor 53, the'contact members 0- of relay C0, conductor 100, the contact members 101, 71 and '72 of car switch CSA and conductors 73 and 42, to supply conductor L2.

The opening of the contact members on the restored push button 8U opened the circuit for the energized floor relay R2 and restored that relay to its deenergized condition.

Atthe same time, the closing of the contact members f on the control relay Co completed a circuit for lighting the up-floor lamp L8U at the eighth floor to indicate to waiting passengers at that floor that the car A would stop of high-speed relay 4, conductor 109, the contact members (I of relay 3, conductor 110, the contact member 1 of relay Co, conductor 100, the contact members 101, 71 and '72 of car switch CSA and conductors '73 and 42, to supply conductor L2.

As the car continues toward the eighth-floor stop, the arm MA moves along the floor selector until the intermediate-speed brush 11 engages the contact segment 149, thereby causing the circuit for lighting of the floor lantern LHU to be transferred from brush 10 to brush 11, which iii) circuit now extends-from supply conductor L1 to the contact segment 149, as just described, and then, through brush 11, conductor 108, the normally closed contact members g of. relay 4,

5 conductor 109, the contact members d ofrelay 3,

conductor 110, the contact members I ofxrelay Co, conductor 100, the contact members, 101,571, and 72 ofcar switch CSA and conductors 73 and s2, to supply conductor L2.. y,

As the car comes to rest at the eighth-floor landinglthe arm MA on the floor selector FS metres to such position that the standing brush 12 is disposedon the ,contact segment 149. Therefore, the circuit for lighting the floor lantern L811 is transferred from intermediate speed brush 11 to the standing brush 12, which circuit now extends from the supply conductor L1 to the contact segment 1&9, as previously described, and then, through brush 12, conductor 11-1, the contact members 2 of relay 3, conductor 100, the contact members 101, 71 and 72 oi car switch CSA and conductors 73 and 42, to supply conductor 12. v 1 Thus, the arrangement of the high-spec i h 10, the intermediate-speed brush 11, a .3, me standing brush 12 causestlie floor lantern liilU to' be lighted whenthe. car A begins to maize the stop at theeighth door, that is, comes into the stopping zone for the eighth floor and to thereafter" remain lighted while the car slows.

down and while it stops at that. door. The floor lantern'LBU will be extinguished by the separa= tion of the contact members'lol and 72 on the car switch CSA when the switch moved to start the car.

Assume now that the car A completes its stop at the eighth floor and that the attendant again moves the car switch USA in a clockwise direction, then the urn-direction switch 1 will be energized, as previously described, and the car will start and move tothe upper terminal floor. As the car A'arrives atthe end of tits up run and is brought to a stop by the usual terminal switches (not shown), the cam member 151 on the upper left-hand corner. of the car A opens the limit switch 34 to deenergize-the up selector relay 32 and energize-the down selector relay 33 for causing the movable arm -MA to be-tilted over so that it bears upon the" down contact sege The circuit, completed by the "closingnon the contact members .a on thaselector relay 32 for energizing the selector relay '33, extends iii-om supply conductor L1, through conductor 152, the

' coil of relay 33,'conductor 154, the contact Klein-=- 'fi relay 33 completes a circuit for energizing the electric-magnet 31 to tilt the arm MA until it ,rests upon the down contact segments, which circuit extends .from' supply conductor L1,

throughconductors 152,157, and 158, the contact members 17 on relay '33, conductor, 159, the

coil'of electromagnetdl and conductors 160 and 162 to supply conductor L2. i

Assuming now that the car A has taken on a number of passengers atthe upper terminal and is ready to start down opdthat the car ,.attenclant moves the car: switch CSA in a countenclockwise direction, then a circuit is completed, for energizing the down-direction switch 2 to start the car downwardly, which circuit extends from supply conductor L1, through conductors, and, 56, the contact members of stoppingii -1' ductor relay S, conductors 57 and 165,- the coil of relay 2, conductors 166 and 167, the contact members 168, 71 and 169 on the car switch CSA and-conductors 73 and 42,110 supply conductor The closing of the contact member a on the down-direction switch 2 completes a self-hold ing circuit for that switch, extending from supply conductor Ll, through the coil of down-direction switch 2, as just described, and thence,

through conductor 166,- the contact members at of directionswitch 2 and conductors 170 and 76, to supply conductor L2.

The closing of the contact members b and c on the down-direction switch 2 energizes the field winding GF of the generator G with current in the reverse direction by way of a cir-- cult that extends from supply conductor L1, through conductors 77, 78, and 175, the contact members b on down-direction switch 2, conductor 81, the winding GF, conductors 80 and 176, the contact members 0 of down-direction switch 2, conductors 177 and 83, the resistor sections r1, T2, and T3 and conductor 85, to sup ply line L2.

The energization of the field winding GF causes the generator G to supply current in the reverse direction to the hoisting motor EM, and the cars starts downward.

As the attendant continues the movement of the car switch USA in a counter-clockwise direction, a circuit is completed for energizing the intermediate-speed relay 3 to cause the car -to operate at its intermediate speed, which circuit extends from supply conductor L1, through condoctors 55 and 56, the contact members of inductor relay SD, conductor 88, the contact members of inductorrelay SU, conductor 89, the coil of relay 3, conductor 90, contact members 180, l

The closing of the contact member a on the intermediate-speed. relay 3 completes a selfholding circuit for that relay which extends from supply conductor L1 to the coil of relay 3, as just-described, and thence, through the con,- tact members a of relay 3 and conductors 93 and 94, to supply conductor L2.

The closing of thecontact members b on the intermediate-speed relay 3. shunts the resistor section r3 from the circuit of the field winding Ci-F, as just described, therebypausing the car A to travel at its intermediate speed.

Assuming that the attendant desires to cause thecar to travel at a still greater speed, he

moves. the car switch CSA further in its counterclockwise direction, then a circuit for energizing the high-speed relay 4 to cause the car to travel at its high speed will be completed from supply conductor L1, through conductors 55, 56 and 115, the contact members of inductor relay l-ID, conductor 116, the contact member of in ductor relay HU, conductor 117, the coil of high speed relay a, conductor 118, the contact mem bers a of voltage relay 7, the conductor 119, the

contact members 9 of the control relay Co, conductors 1'20 and 181,v the contact members 182, 71 and 169 of car switch CSA and conductors 73' and 42,.tosupp1y conductor L2.

6 contact members a of relay 4 and conductors 126, 93 and 94, to supply conductor L2.

The closing of the contact member b on the high-speed relay 4 shunts the resistor section r2 from the circuit of the field winding GF, as previously described, thereby causing the car to travel at an increased speed.

Inasmuch as 'the dispatcher has not 'yet opened the express-speed switch 9, the car is still conditioned to operate at express speed. -Therefore, as soon as the generator G reaches a predetermined speed, the voltage relay 7 will close its contact members I) to complete the hereinbefore described circuit for energizing the express speed relay 5. Consequently, that relaycloses its contact members, thereby. shunting the resistor section 1'1 from the circuit of the field winding GF, as previously described, and causing the car to travel downwardly at express speed.

Assuming further that some of the passengers taken on at the upper terminal called out stops for the third and second floors and that the attendant pressed the push buttons A3 and A2 to register the stops indicated by the passengers so that the car will be automatically stopped at those floors, then circuits have been partially prepared for energizing the floor relays R1 and G1 to eflect the stopping of the car at the third and second floors, which circuits will be completedwhen the car enters the decelerating zones for the landings and causes the brushes and contact segmentson the floor selector to complete the prepared circuits.

The pressing of the button A3 completed a self-holding circuit for that button extending from supply conductor L1, through conductors 55, 185 and 186, the contact members of button .A3, holding coil 187 andconductors 188 and 42,

to supply conductor L2. The closed condition of the button A3 supplies energy to the contact segment 190 on the floor selector for stopping the car and, at the same time, indicates to the car attendant that a call has been registered to stop the car at the third floor.

As the car A approaches, at express speed, the down stop at the third floor, it will be decelerated from the express speed to its low speed because the arm MA on the floor selector will cause the express brush 21 to engage the energized contact segment 190 and thereby en- D relay, as hereinbefore described.

The opening of the normally closed contact members a on the relay 6 deenergizes express relay 5 and causes the car A to decelerate from express speed to its high speed.

As the car A continued its approach to the down stop at the third floor, the high-speed brush 20 engages the energized contact segment 190 on the floor selector, and thereby completes the circuit partially prepared by the operation of the push button A3 for operating the floor relay R1 to effect the stoppingof the car at the third floor, which circuit extends from supply conductor L1, through conductors 55, 185 and 186, the contact members of push button A3, conductor 191, restoring coil 192, conductor 193, contact segment 190, brush 20, conductors 195,

196, the coil of floor relay R1 and conductors 197 and 64, to the supply conductor L2.

The closing of the contact members on the floor relay R1 completes a circuit'for energizing the control relay Co, which circuit extends from supply conductor L1 through conductors and 56, the contact members of inductor relay .S, conductors 57 and 58, the coil of relay Co, conductor 59, the contact members of relay R1 and conductors 198, 145 and 64, to supply conductor L2.

The closing of the contact members a on relay Co completes a self-holding circuit for that relay which extends from the supply conductor L1 to the coil of relay Co, as just described, and.

thence, through the. contact members a of relay Co and conductors 63 and 64, to supply conductor L2. 9

The closing of the contact members hen the relay Co completes a circuit for energizing the inductor relays HD, SD, and S, so that they will be actuated by the inductor plates HD, SD and S to bring the car to a stop at the third floor landing, which circuit extends from supply conductor L1, through conductors 55 and 56, the

coil of inductor relay S, conductors and 200,

in parallel through the inductors HD and SD HD, SD, and S for the third floor and thereby open the circuits for high-speed relay 4, inter-' mediate-speed relay 3 andthe down-direction switch 2, thus deenergizing the high-speed relay 4, the intermediate speed relay 3, and .downdirection switch 2, and bringing the car to a stop at the third floor.

At the time the control relay Co was energized, it closed its contactmembers d to complete a circuit for causing the car button -A3 to be restored to its normal open position, which circuit extends from supply conductor L1, through conductors 55, 185 and 186, the contact members of button A3, conductor 191, restoring coil 192, conductor 193, contact segment 190, high-speed brush 20, conductors 195, 196 and 202, the contact members 11 of relay 4, conductor 203, the contact members d of relay Co, conductor 100, contact members 101 '71 and 169 of car switch CSA and conductors 73 and 42, to supply conductor L2.

It will be noted that this circuit is a shunt circuit around the coil of the. floor relay R1. Therefore, full voltage is supplied to the restoring cell 192 and it overcomes the holding coil 187, thus restoring the .push button A3 to its normal open position. The opening of the contact membe of the. push button A3 deenergizes thefloorre yRland restoresit.

At the same time, the energization of the conm1 relay Co closed its contact members e which ing passengers that the car A would stop at that floor, which circuit extends. from supply conductor L1, through conductors 55 and 105, floor lantern L3D, conductor 204, contact segment 205, brush 27, conductor 206, the contact member J of high-speed relay'4, conductor 207, the

contact members j of relay 3, conductor 208,

the contact members e of relay Co, conductor 100, the contact members 169, 71 and 101 of car switch CSA and conductors 73 and 42, to supply conductor L2.

As the car continues toward the third door,

the floor selector arm MA moves downwardly.

until the low-speed brush 26 engages the contact segment 205and thereby causes the fighting of the floor lantern L3!) to be transferred from brush 27 to brush 26 by way of a circuit that extends irom the supply conductor L1 to the contact segment 205, as just described, and then,

through'brush .26, conductor 209, the normally closed contact-members i of high-speed relay 4, conductor 207, the contact members 1' of intermediate-speed relay 3, conductor 208, the contact members e of relay Co, conductor 100, contact numbers 101, 71 and 169 of car switch CSA and conductors '73 and 42, to supply conductor L2.

As the car comes to rest at the third floor landing, the arm MA bn the floor selector moves to such position that the standing brush 25 is disposed on the contact segment 205, thus transferring the circuit for lighting the floor lantern MD from the low-speed brush 26 to the standing brush 25, which circuit now extends from thexsupply' conductor L1 to the contact segment 205955 just described, and. then, through brush 25, conductor 210, the normally closed contact members c of relay 3, conductor 100, the contact members 101, 71 and 169 of car switch CSA and conductors '73 and 42, to supply conductor L2..

Thus, the arrangement of' the high-speed brush 27, the intermediate-speed'brush 26 and the standing brush 25 causes the down floor lantern L31) to be lighted when the car A prepares to stop at the third floor and to thereafter remain lighted while the car slows down, and while it stops at that floor.

Amuming now that the stop at the third floor is completed, and, recalling that-the car attendant pressed the car button A2 to cause-the car to stop atthe second floor on its down trip, then the pressing of the button A2 completed a'seliholding circuit for that button extending from supply conductor L1, through conductors 55, 185 and 212, the contact members or button A2,

holding coil 213 and conductors 188 and 42, to

supply conductor L2.

Inasmuch as the button A2 has been operated for a down stopat the second floor, the standing of the car at thethird floor will cause a circuit to be completed for energizing the floor relay G1 to cause the car to stop at the second floor, which circuit extends from Supp conductor L1,

through conductors 55, 185 and 212, thecontact ously described.

The closing of the contact members on the floor relay G1 completes a circuit for energizing the control relay Co, which circuit extendstrom 30, conductors 59 and 60', the contact members of relay G1 and conductors 223, 82 and 52, to supply conductor L2.

The closing of the contact members a on the control relayCo completes a self-holding circuit for that relay which extends, as just described, from the supply conductor L1 to the coil of relay Co, and thence, through the contact members a of relay Co and conductors 63 and 64, to supp conductor L2.

The closing of the contact members (1 on the relay Co completes a circuit for supplying full voltage to the restoring coil 214-to cause it to overcome the holding coil 213 and release the push button A2 to its open position, which cir- 'cuit extends from supply conductor L1, through conductors 55, 185 and 212, the contact members of button A2, conductor 225, restoring coil 214, conductor 215, contact segment 216, brush 19,

' conductors 217 and 218, the contact members 0 of high-speed relay 4, conductor 203, the contact members-d of relay Co, conductor 100, the contact members 101, '11 and 169 of car switch-GSA and conductors 73 and 42, to supply conductor The movement of the push button A2 to its open position, opens its contact members, thereby deenergizing the floor relay G1.

The closing of the contact members e on the control relay Co completes a circuit for lighting the down floor lantern. L2D, in a manner previ- The closing of the contact members b on the control relay Co completes a, circuit for energizing the inductor relays, as previously described.

-The opening of the-contact members 9 on the control relay Co opens the circuit for the highspeed relay 4 and prevents the operation of the car at high speed, thus providing a means whereby the car A will run at intermediate speed upon being'started from the third floor and make a one-floor run to the stop at the second floor.

Assuming now that the car attendant .operates the car switch CSA in a counter-clockwise direction to its full running position in the usual manner after the stop at the third floor is com pleted, then the down-direction switch 2 and the intermediate speed relay 3 will be energized as previously described, and the car will make a one-floor run to and stop at the second floor.

Afte'r the stop at the second floor is completed,

the operation of the car may be continued heretofore as described.

Thus, it will be seen that I have provided an elevator-controhsystm that serves to indicate the registered condition of the control push buttons associated therewith, and which provides for restoring the push'buttons to their normal open position as soon as the elevator car begins to answer a stop call set up by the buttons. It will also be noted that my control system requires a small number of parts and a minimum amount of wiring, as compared with the usual elevator-control systems.

While I have illustrated and described only one specific embodiment of my invention, I realize that it is susceptible of many -modiiications,

therefore, I do not desire to be limited to the precise construction and arrangement 01' parts illustrated and described, except as defined in the appended claims.

I claim'as my invention:

1, In a control system for an elevator car operable past a landing, means for stopping the car at said landing, a control circuit for connecting said stopping means to a source of power, a pushbutton switch for partially closing said control circuit, a holding coil for maintaining said switch in a closed position, a circuit disposed to be completed by the closing of said switch for energizing said holding coil, means operably responsive to movement of the car for completing the closure of said control circuit, and means operably responsive to the operation of said stopping means'for causing said holding coil to release said switch, X

2. In a control system for an elevator caroperable past a landing, means for stopping the car at said landing, control circuit for connecting said stopping means to a source of power, a pusl1=-button switch for partially closing said control circuit, a holding coil for maintaining said switch in a closed position pending complete closure of said control circuit, a circuit disposed to be completed by the closing of said switch for energizing said holding coil, means operably responsive to movement of the car for completing the closure of said control circuit, a restoring coil for causing said holding coil to release said switch and means operably responsive to operation of said stopping means for energizing said restoring coil,

3, In a. control system for an elevator car Operable past a landing, means for stopping the car atsaid landing, a control circuit for connecting said stopping means to a source of power, a push-button switch for partially closing said control circuit, a holding coil for maintaining said switch in a closed position pending complete closure of said contilol circuit, a circuit disposed to be completed by the "closing of said switch for energizing said holding coil, means operably responsive to movement of the car for completin; the closure of said control circuit, a restorin: coil associated with, and wound in opposition to, said holding coil for causing said holdlng coil to release said switch, and means operably responsive to operation of said stopping means for energizing said restoring coil.

4, In a control system for an elevator car oparable past a landing, means for stopping the car atsaid landing, a control circuit for con'nect-, lng said stopping means to a source of power,

control circuit. a holding coil for maintaining said switch in a closed position pending complete closure of said control circuit, a circuit disoperably responsive to movement of the car for completing the closure of said control circuit, a restoring coil disposed in series with said stopping means in said control circuit, a secondary circuit disposed in shunt relationto said control circuit. and means for closing said secondary circult to shunt said stopping means and thereby energize said restoring coil sufiiciently to cause said holding coil to release said switch.

ing said switch in a closed position pending complete closure of said control circuit, a circuit disposed to be completed by the closing of said switch for energizing said holding coil,

means operably. responsive to movement'of the car for completing the closure of said control circuit, a restoring coil disposed in. series with said stopping means in said control circuit, a secondary circuit disposed in shunt relation to said stopping means, and means operably responsive to the operation of said stopping means for closing said secondary circuit to shunt said stopping means and thereby energize said restoring coil sufiiciently to cause said holding coil switclrfor energizing said holding coil, means operably responsive tomovement of the car for completing the closure of said control circuit, a restoring coil wound in opposition to said holding coil and disposed in series with said stopping means in said control circuit, a secondary circuit disposed in shunt relation .to said stopping means, and means operably responsive to operation of said-canstopping means to stop said car for closing said secondary circuit to shunt said stopping means and thereby energize the restoring coil sufficiently to cause said holding coil to I release said switch.

7. In a control system for an elevator car opof an attendant on said car-for starting said car, means for stopping the car at said landing, a control circuit for connecting said stopping means to a source of power, a push-button switch for partially closing said control circuit, a holding coil for maintaining said switch in a closed position pending complete closure of said control circuit, a, circuit disposed to be completed by the closing of said switch for energizing said holding coil, means operably respon- Give to movement of the car for completing the closure of said control circuit, a restoring coil in opposition to said releasing coil and in series with said stopping means in said control cirwait, a shunt circuit around said stopping means, ,a push-button switch for partially closing said and means operably responsive to operation of said stopping-means for completing said shunt circuit, said restoring coil to beso proportioned with reference to said holding coil as to remain posed to be completedby the closing of said' switch for energizing said holding coil, meansineffective while in series with the stopping means and to overcome the holding coil and cause it to release said switch when the shunt circuit is completed.

8. In a control system for, a plurality of elevator cars operable'past a landing, means associated with each car for stopping that car at said landing, a control circuit for connecting the stopping means for each car to a source of power, a push-button switch for partially closing said erable pasta landing, means under the control v control circuit, a holding coil for maintaining said switch in a closed position, a circuit disposed to be completed by the closing of said switch for energizing said holding coil, means associated with each car and operably responsive to its movement for completing said control circuit to energize the stopping means on that car. and

means "operably responsive to the operation of the stopping means on the first car to stop at said landing in response to the operation or said push-button switch, for causing said holding coil to release said switch.

9. A control system for an elevator car com-- prising stopping switch mechanism, contactors controllable manually, oppositely wound windings operatively associated with said contactors, one to maintain them in actuated position and the other to neutralize the action of the maintaining winding to return said contactors to normal position, an energizing circuit for said other winding comprising contactors controllable by the car and additional contactors in series therewith, closed only after actuation of said stopping switch mechanism to render said other'winding effective. Y

10. A control system for an elevator car comprising contactors for each of a plurality of landings controllable manually therefrom, oppositely wound windings operatively associated with the contactors for each of said landings, one oi? which maintains its contactors in actuated position, and the other of which is provided with a circuit controllable by the car and is efiective when energized to neutralize the action or the maintaining winding to cause its contactors to return to normal position.

a '11. A control system for an elevator car comprising up and down floor switches for each of a plurality of landings, each having oppositely wound windings, one of the windings of any of said switches energizable at anytime regardless of the position of the car'and the direction of movement of the car, and means to successively energize the other windings of said up switches when the directionof car movement is upwardly but not when it is downwardly, and means to successively energize the other windings of said down switches when the direction of car movement is downwardly but not when it is upwardly.

12. A control system for an elevator car comprising a floor switch for each oi. a plurality of landings, each having a maintaining winding and a self-holding circuit therefor, and an'additional winding to oppose the magnetic effect of the maintaining winding to re-set its switch, car controlled mechanism to control circuits for said additional windings, and circuits responsive to said floor switches to control the car.

WILLIAM F. EAMES.

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