US1938238A - Elevator control system - Google Patents

Description

ELEVATOR CONTROL SYSTEM Filed Feb. 18, 1932 4 Sheets-Sheet 1 INVENTOR.

C/Iar/es 6 Wallis.

Dec. 5, 1933. c G, w s 1,938,238

ELEVATOR CONTROL SYSTEM Filed Feb. 18, 1952 4 Sheets-Sheet 2 9 2 INVENTOR.

I Dec. 5, 1933. c. e. WALLIS 1,938,238

ELEVATOR CONTROL SYS TE'M wu-U WITNESSES: INVENTOR.

W Char/es G. 4 a BY Patented Dec. 5, 1933 ELEVATOR CONTROL SYSTEM 1 Charles G. Wallis, Chicago, Ill., assignor to Westinghouse ElectricElevator Company, a corporation of Illinois Application February 18, 1932. Serial No. 593,780 16 Claims. (Cl. 187-29) My invention relates to automatically operated electric elevator, systems adapted for operation without .a skilled attendant, and relates particularly to automatic elevator control sys- 5 tems for effecting a substantially immediate response to a call registered while the car is proceeding to a predetermined position under. the

influence of a biasing control which is effective,

the car remains at the floor corresponding to the last call registered 'lll'ltll another call is registered. This type of elevator-control system has the disadvantage, of causing the elevator car to ;movefrom a remote floorto the floor at which a subsequent, call is registered and thus necessitates an appreciable delay incalling the car to the floor at which the call isyregistered.

,In order to reduce the time required for the elevator car to move to a floor at which a call is devised, embodying a so-called biasing control, for causing the elevator carto automatically move to a predetermined position, such as the lower terminal floor or a floor intermediate of the lower and upper floors,'after the complete response to a prior call. In elevator control systems of this type, however, it is necessary that the elevator car proceed to the predetermined to thatposition, except that if a call is registered in advance of thecar and for the same direction of movement as that in which the car will stop. The result of this is moving, the car feature is that calls behind the elevator car or calls in advance of the car which require an opposite direction of movement in response thereto than that in which the car is moving.

when registered while the car is proceeding'to 150 the predetermined position, are not responded to untilthe, elevator car reaches the predetermined position. Thus, the elevator car frequentlypasses the fioor'at which a call is regis- 5 tered and returns thereto only after having reachedthe predetermined position. Obviously,

registered, elevatorcontrolsystems have been.

position without stopping, once it has started 7 this causes an unnecessary delay in responding to a registered call.

In elevator control systems of the type comprising my present invention, this disadvantageous feature is eliminated because a substantially immediate response to a call is effected thereby,without the necessity of the car proceeding to the pre: determined position. For example, if an up call is registered on the third floor of aten-story structure when the car is at the eighth floor 5 descending toward the first or lower terminal floor, under the influence of the biasing control, the car is caused to stop at the third floor upon attaining that level instead of proceedingto the first floor and then returning to the third floor. As another example, let it be supposed that a down call is registered at the eighth floor of a-ten-storystructure when the car is at the fifth floor descending toward the first or lower terminal floor underthe influence of the biasing controlg In such case, the. car will stop at the nearest floor possible in the direction it is moving, (in the case given this being the fourth floor), reverse its direction of movement and ascend .to the eighth floor, where it automatically 30 stops. I I

. It is, therefore an object of my invention to effect the most eilicient method of operating an elevator system of v the type herein described.

, Another object of my. invention is to effect with the minimum of delay, a response to a call registered. l

Another object of my inventionis to provide a novel control system for effecting a so-called biasing f control of an elevator car whereby it is caused to move automatically to one predetermined position, or, optionally, to any one of a plurality of predetermined positions, after it has completely responded to the last call registered. I

I I A further object of my invention. is to effect a 1 response of anelevator car to. a registered call,

regardless of the'location of the call withrespect .to the car,jin preference to'a response of the car to a biasing control means influencing the elevator-car to a predeterminedposition.

Qtherobjects ,of my invention will be apparent from the following description of my invention whentaken inconnection with the accompanying drawings wherein:

Figures 1, 2 and 3, taken together, constitute an across-the-line diagram illustrating one embodiment of my invention, T I Fig. 4 isa diagram, showing an elevator car provided with inductor slow-down and stopping 110 relays and the relative positions, with respect to several floors, of inductor plates ,thereformounted in the hatchway and adapted to cooperate with the inductor relays on the'elevator car.

Fig. 5 is a diagram illustrating the operation of any of the inductor relays shownin Figs. 1 and 4, and Fig. 6 is a diagram showing the position of the movable contact members on the floor selector, employed in my invention, with respect to the stationary segments thereof, at any one time, and the corresponding positions of inductor plates mounted in the hatchway.

Referring to Figs. 1, 2, 3 and 4, thecontrol system embodying my invention is illustrated as applied to a building having a basement floor B and four other floors,'designated as #1, #2, #3, and #4, respectively. It should be understood, however, that the number of floors in the building is immaterial and that my invention can be embodied in a control system applicable to any'building, regardless of the number of floors therein.

The control system, constituted by Figs. 1, 2 and 3, includes a variable-voltage or Ward- Leonard type of motor control, which comprises an elevator motor M, of a direct current type, provided with a separately excited field-winding MF, which motor is employed for driving the elevator car C, shown in Fig. i. A cable drum -D, secured to the shaft of the armature MA of the motor M, is adapted to support a cable 0a which is wrapped therearound in the usual manner, the cable being secured at one end thereof to the'car C and at the other, end thereof 'to a counter-weight Cw. 5

A brake B, of well known construction, is provided for the motor M and includes a brake drum BD which is preferably secured to the shaft of the motor armature MA and a brake shoe BS which is adapted to frictionally engage the drum under the influence of a biasing I means, such as a compression spring, not shown.

In accordance with well known practice, a brake coil or solenoid'BG'is also provided for actuating a plunger member of the'brake shoe BS and thereby-releasing the brake when the. coil is energized. h

Power is supplied to the winding of the armature MA of the motorQM from a generator G, the

winding of the armature GA of the generator being connected in loop circuit with-the winding of the' armature MA and a series field winding GSF of the generator G.

The'generator armature GA is driven by a motor DM of any suitable type, such as the three-phase induction motor illustrated, which is connected to the three-phase supply conductors m, n, o, by means of a switch 3.

The generator G is provided with a separately excited field-winding GF which is reversibly controlled byan up. direction relay or switch 1 and a down direction relay or switch 2,

reversible control for the motor M being thereby, also effected. I I

Resistors R1 and R2 are connected, in series with generator field-winding GF, across the supply conductors L1 and L2 and are adapted to be short-circuited by the contact members of relays GR5 and GR6, respectively, whereby acceleration of the motor M is effected. Obviously, the relays GR5 and GR6 are employed to reinsert the resistors R1 and R2 to effect deceleration of the motor M. I I

A relay 6 is employed in conjunction with certain contact members a of either relay 1 or 2 for efiecting the energization of thebrake coil BC and also the coil of a relay 39. 7

Relay 39 is actuable to partially complete a circuit for effecting theenergization ofcoils 3L, 2L and IL of high-speed slow-down inductor relay H, intermediate-speed slow-down inductor relay I and stopping inductor relay S, respectively.

The inductor relays H, I and S may be of any suitable type but are preferably of the type described in the copending application of Harold W. Williams, Serial No. 279,771, filed May 22, 1928 and assigned tothe Westinghouse Electric 8: Manufacturing Company, the construction and operation of which may best be understood by reference to Fig. 5 in which one is diagrammatically shown.

Referring to Fig. 5, any of the inductor relays, as, for example, the inductor relay H, comprises a-magneticstructure I-Ia' of IT-shape, having a central core portion HI) and a pair of small lugs or projections Hc extending from the ends thereof on opposite sides. A pair of armatures Hu and H01, of magnetic material are pivoted to the magnetic structure Ha in juxtaposition to the lugs Hc. Each of the armatures Hit and Hd is provided with a contact member for engaging a separate stationary contact member. The

contact member on armature Hu and its asso-v ciated stationary contact member will hereinafter be designated as contact members UH and thecontact member on armature Hd with its associated stationary contact member will be designated as contact members DH. 2

The armatures Hu and Hd are biased by any suitable means, such as a spring, to a position in which their contact members respectively engage their associated stationary contact members.

When an armature is pivoted away from its assonetic circuit of two branches both of which are normally incomplete because of the large air gaps between the upper portion of the magnetic structure and the armatures.

The inductor relays I and S are provided with contact members UI and US, respectively, which correspond to contact members UH of relay H and are also provided withcontact members DI and DS, respectively, which corresponds to contact members DH of relay H.

.- The energizing windings for relays I and g are designated respectively as 2L and IL.

The operation of any of the inductor relays is as follows, relay H being taken as an'example: As long as the winding 3L is de-energized, the armatures Hu and, Hd remain in their biased positions with their contact members engaging their respectively associated stationary contact members. Upon the energization of the winding 3L, as by the closure of a switch 3S connecting the winding to a suitable source of' energy such as the battery 33, a magneto-motive force is impressed upon the magnetic circuit of the relay. Because of the large air gaps between the armatures and the opposite ends of the magnetic structure Ha, the magnetic flux set up: in the relay is insufiicient to cause a pivotal movement of'the armatures.

. If abranch of the magnetic circuit is completed, however, as by movement of the relay into a position adjacent to aninductor plate 1HU, the corresponding armature Hu pivots,

against the force exerted by the biasing means, into a position to engage the corresponding lug He, thus effecting the disengagement of the conand thus the contact members UH remain open.

In a similar manner, assuming the coil 3L to be energized, and the second branch of the magnetic circuit to be completed by the. movement of the relay into the position adjacent another inductor plate lHD, the armature Hd is pivoted into aposition in engagement with its correv sponding lug He thus effecting the opening of contact members DI-L- When the relay moves away from the inductor plate the armature Hd does not return to its. biased position because of the magnetic attractionexerted thereon by the lugJHc with which it is in engagement and thus 25,

the contact members DH remain open.-

vWhen the winding 3L is deenergized by opening the switch" 38, the magnetic attraction exerted upon the armatures Hu and Hd by the lugs H0, is not sufiicient to overcome the force exerted thereon by-the biasing means and the armaturesarereturned to their biased positions. Thus contact members UH and DH are reclosed.

If the winding 3L of the relay ,is deenergized, a movement of the relay to a position adjacent an inductor plate is not effective to cause a separation of the contact members UH or DH.

.Itwill, therefore, be seen-that a separation of the contact members UH and, DH is effected only when the winding 3L is energized and the relay is moved into a position adjacent a corresponding inductor plate.

. Referring to Fig. 4, the relative disposition of the inductor plates for efiecting the slow- 'tance of theinductor relays from the .fioor of the elevator car, any other disposition of the inductorrelays may be hadwith a corresponding adjustmentin the positionof the inductor plates.

Assuming the: elevator car to be ascending toward floor #1 it will be clear that the contact members UH; UI and-US are opened in succession by the relays H, I and S reaching the level of their-respectively associated inductor, plates lHU, III] and 1SU. cs1

In a similar manner when the relays H, I and S successively reaching the level of the inductor plates lHD, 11D and 18D with which they are respectively associated;

The energization of the energizing coils 3L,

2L, and IL of relaysH, I and S, respectively,fis efiected in a manner which will be described in detail hereinafter.

Referring. to Fig. 6, all of the inductor plates the elevator car is descending toward floor #1 contact members DH,-DI and DS are'opened in succession by -'I he up contact members contact members D8 of stopping inductor relay for all of the floors are diagrammatically illustrated, the up. high-speed plates for floors #1, #2, #3 and #4being designatedlHU, 2HU, 3HU andI-IU, respectively; the up intermediate-speed plates for the same hours being designated 1IU, 2IU, 3IU and 4IU, respectively; and the up? stop-plates for the same floors being designated 1SU, 2SU, BSU and 4SU, respectively. Similarly, the down high-speed plates for the basement floor B and floors #1, #2 and #3 are designated, respectively, BHD,

speedplatesfor the same floors are designated, respectively, BID, lID, 2ID, and'3ID; and the down stop-plates for, the same floors are designated, respectively, BSD, 1 SD, -2SDand 38D.

.VlHD, 2HD'and 3HD; the down intermediate For ,purposesof clarity, thegroupsof up and down plates for the various floors. have been moved laterally apart and are not shown in their proper relative vertical relation as. in

Itwill be noted that whereas in Fig. 4, the

stopping. plates 1SU, 2SU, etc., are disposed in the hatchwayysome distance above the level of the floor to which they correspond, for reasons as previously explained, in Fig. 6 the same plates are illustrated as coinciding with broken lines .passing therethrough,

These broken lines are, respectively, the inductor floor lines corresponding. to I the various floors, the inductor floor linesbeing a distance above the floor, to which each corresponds, which is equal to the distance of the inductor relays on the car above the floor of the elevator car. I H v Referring to Figs. 1, 2 and 3 a safety circuit including ,a top over-travel switch, a bottom over-travel switch, a plank switch, a governor switch and a motor-generator -over speed switch, all illustrated symbolically by characters Xisprovided in series with an emergency stop switch suitably-identified in Fig. 1 for preventing the energization of each of the relays 1,2 and 6 unless all of the switches are. closed.

.A relay 42 is employed for completing a circuit-for energizing the relays 1,2 and-6 in a manner which will be, hereinafter fully described.

. A voltage-responsive relay 31 of wellknown construction is provided with an actuating coil which is connected across the brush terminals of the winding of the armature MA and effects theenergization of the relay GR6 to short circuit the resistorRZ and thereby efiect the acceleration of the motor to high speed.

which results in a deceleration-of the elevator car to slow speed. 7

US and'the down S: whenopened, as previously described, effect the deenergization respectively of. relays land 6 and 2 and 6 which results in the final stopping of the elevator car. 1 1

Any-suitable type of, operating=means for-the elevator car to V intermediatev elevator car may be employed in conjunction with my invention. However, as illustrated, in

Figs. 2 and 3, I prefer to employ call-means consisting of an up and a down push-button switch at each floor except the upper and lower floors, namely, floor #4 and the basement floor,

at which are disposed only a down push-butbutton at the upper terminal and a down button at the basement floor would be superfluous and unnecessary.

I prefer also to employ additional call-means consisting of a plurality of push-button switches in the elevator car,'one for each of the floors past which the elevator car moves and at which it may stop.

The push-button switch at the upper terminal or fourth floor is designated, in Fig. 2, as 4D and the push-button switch at the basement floor is designated as BU. The up direction pushbutton switches at floors #1, #2 and #3 are.

designated, in Figs. 2 and 3, as 1U, 2U, and 3U, respectively. The down direction push-button switches at floors 1, #2 and #3 are designated as 1D, 2D, and 3D, respectively. p

The push-button switches in the elevator car are designated BC, 1C, 2C, BC, -and.4C, corresponding, respectively, to the basement floor and floors #1, #2, #3 and #4.

A plurality of relays or switches 28, 11, 12, 13, 14, 21, 22 and 23 areprovided for registering calls in response to the operationof the pushbutton switches at the floors and in the car, which relays will hereinafter be termed callregistering or call-registration relays.

-The two-digit designations for these relays j are significant of their function and character. The first digit 1 or 2 indicates that the relay registers an up or a down call, respectively. The second digit, namely B, 1, 2, 3 or 4, designates the floor to which the relay cor-' For example, relay 13 registers an responds.

of pushup call in response to the operation button switch 3U at floor #3. 1

The upper terminal floor, which in this case is the fourth floor, has but one relay, 14, associated with the push-button switches 4D and 4C and the basement floor has but one relay 23 associated with the push-button switches BC and BU.

A pair of relays 11 and 21 are associated, respectively, with the up and down? direction push-button switches 1U and ID at floor #1..

A pair of'relays 12 and 22 areassociated, respectively, with the up direction switch 2U and the down direction switch 2D at floor #2.

' A pair of relays 13 and 23 are associated respectively, with the up direction switch 3Uand the down direction switch 3D at floor #3.

It is to be noted that the p lSh-buttonswi'tches 4D and BU at the upper floor and basement floor, respectively, are so designated merely to conform to the desire of the passenger to go down or up respectively, but that actually, 4D

is the equivalent .of an up-call push button and BU is'the equivalent of a down-call push button.

associated with both of therelays which are associated, individually with the corresponding push-button switches at the corresponding floor.

' sesame Each of the relays 2B, 11, 1'2, 13, 14,21, and 23 is provided with amain coil for actuating the relay and a neutralizing coil for de-actuat ing the relay, the coils being designated by characters consisting of the numeral designating-the" 30 relay and a sufiix M or N, respectively. For example, the main coil'of relay 14 is designated as 14M and the neutralizing coil for relay 14 is designated as MN.

Taking the push-button switches and relays. for the third floor as an example, the operation 'of push-button switch 3U closes a circuit'for energizing the main coil 1'3Mior coil 13. The normally open contact'members a of relay 13, when closed as a result of the energization of the main coil 13M, establish a holding circuit which shunts the push-button switch 3U, and thus permits the latter tobe'released and thecall so registered maintained.

Similarly, the operation of the push-button g switch 3D closes a circuit for energizing the main coil 23M of relay 23, a holding circuit being established therefor by-contactQ-members a' of relay 23 which close when the main coil 23M is energized. I

The push-button switch 30 in the carisproioo vided with apair of contact members connected sequent direction of movement of the elevator 1.1

car.

-A floor selector 'FS is provided which may be of any suitable construction and which functions in a manner which will be. hereinafter described in detail. The floor selector FS is provided with 1 an up cancellation contact segment and a down cancellation contact segment; for each, of the floors except the basement and the upper terminal floor, for each of which is provided only a down cancellation segment and an, up cancellation segment, respectively. The up segments lCU, 2CU, 301) and -4CU disposed rel-' ativelyin positions corresponding to the position of the elevator car at floors #1, #2, #3 and #4, respectively, comprise one row, and the down segments BCD, 1CD,. 2CD and 3CD disposed relatively in positions corresponding to the position of the elevator car at the basement floor, floors #1, #2, and #3, respectively, comprise an adjacent row. 1 j 3 Each of the segments 'is connected to the neutralizing coil of the call-registering relay corresponding thereto. For example, segment 3CU is connected to the neutralizing coil 13N of relay 13. 7 Q Theselector FS further-comprises "a brushcarriage 4, shown in broken lines' in Fig. 6, which carriage is moved in accordance with the movement of the car by any suitable mechanism and which has secured thereto a contact member 5 for successively engaging the alined segments o, 2CU, v and 40o as well as a contact member? secured thereto in spaced re lation to contact member 5 for successively "en gagingthe alined segments BCD, 1CD, 2CD and 145 3CD. I I v The contact members 5 and"? are connected to one of the supply conductors, namely L2, and the neutralizing coils are connected to the other supply conductor L1. Thus when the elevator 150 'the'relay, is thus cancelled.

A pair of relays 81 and 82 are provided which are normally energized as long as there are no calls registered. Whenever a call is registered by the operation of one of the push-button switches such as 4D, 3D, etc., one of the relays 81- or 82 is selectively deenergized to partially complete a circuit for energizing up direction relay 1 or down direction relay 2, respectively.

In order to effect the selective deenergization of relays 81 and 82, one terminal of each thereof is connected to a common supply conductor, namely L1, and the opposite terminals thereof are connected to each other through a series of normally closed contact members on all the callregistering relays, that is, the normally closed contact members 0 and d of relays 2B, 11, 12, 13, 14, 21, 22 and 23.

The common terminal of the contact members e and d of each call-registering relay is connected to a separate segment on the floor selector FS and the circuitfor energizing relays 81" and 82 is completed therethrough to supply conductor L2 by means of contact members 8 and 9-secured to the brush-carriage 4 on the selector 'FS and electrically connected to the supply conductor L2 by flexible conductors or other suitable connecting means.

The segments on the floor selector include a plurality of up segments disposed in alinement in one series, the segments being designated 1FU,"2FU, 3FU and 4FU, corresponding, respectively, to floors #1, #2, #3 and #4. V

The segments onthe floor selector also include a plurality of down segments disposed in an adjacent alined series and designated BFD, lFD, 2FD and 'BFD'corresponding, respectively, to the basement floor and floors #1, #2, and #3.

The common terminal of the contact members 0 and d of a relay for registering an "up call is connected to an up or FU segment corresponding to the same floor as that to which the relay corresponds. For example, segment 3FU is connected to the common terminal of contact members 0 and d of relay 13.

Similarly, each FD segment is connected to the common terminal of the'contact members 0 and d of the relay for registering a down call at the floor represented by the segment.

The contact member 8 on the brush carriage of' the floor selector successively engages the segments lFU, 2FU, 3FU, and 4FU, in accordance with the movement of the elevator car to floors #l,,#2, #3 and #4, respectively. That is, the FU segments are of such length and 7 segment corresponds and continues toeng'age the segment until the elevator car ascends from that floor, at which time the contact member disengages the former segment, passes over an insulatingsegment and thenengages the next FU segment in the ascending direction. This is clearly shown in Fig. 6.

The up slow-down zone fora particular floor is, of course, the zone between the highspeed up inductor plate and the stopping inductor plate for the same floor. For example, the up slow-down zone for floor 1 is the zone between the inductor plate lHU and the inductor plate lSU.

The contact member 9 on the brush carriage of the floor selector is adapted to successively engage the down or FD segments in accordance with the approach of the elevator car to the floors to which the segments correspond. I

The-disposition of the FD segments on the floor selector and the lengths thereof is such that contact member 9 engages an"FD segment before the elevator car comes within the down slow-down zone of the floor to which the segment corresponds and continues to engage the segment until the elevator car 'de-' scends from that floor, at which time the contact member disengages the former segment,

passes over an intervening insulating segment and then engages a succeeding FD segment for the next floor in the direction of travel.

At the time the elevator car is at a floor both the contact members 8 and 9 are, respectively,

ments corresponding to that noon.

The insulating segments separating succeed-- ing FU and FD segments are of suchlength as to causethe contactvmembers 8 and 9, respectively, to completely disengage one segment before engaging the succeeding one. The purinv engagement with the FU and FD segpose of such constructionis to effect a momentary deenergization of either relay 81 or 82 as will be explained in greater detail hereinafter;

It'will thus be seen that depending upon the relative positions ofthe contact members 8 and 9, corresponding to the positions of the elevator car in the hatchway, and that of the contact members 0 and d of the call-registration relay corresponding'to the floor for which a call is-- registered, the circuit for energizing either of the relays 81 or 82 is selectively interrupted by the opening of the contact-members c and d and the proper direction of movement of the elevator car, in response to the call registered thereby,

subsequently effected. 1

Additional relays 38 and 80, actuable in response to the deenergization of one,of the relays 81 or 82, are employed for efiecting the 'energization of relay 42, whereby a circuit for energizing the up direction relay 1 and the relay 6 or the down direction relay 2 and the relay 6 is completed to efiect the starting of the elevator car in the proper direction in response to the call registered.

As a part of my invention, I provide a novel biasing control, means which is independent of the push-button switches at the floors or on the car and which includes a plurality of relays or switches, for automatically effecting the movement of the elevator car to any one of a plurality of predetermined positions, after all Included in the above-mentioned plurality of relays, is a relay'88 and a relay 87 which are registered calls have been completely responded v selectively controlled by means of a doublef sponding thereto, until a predetermined time,

such as ten seconds, elapses after the stopping of the car in response tothe last registered call.

- Thus a'passenger has ample time to open the car gate and hatchway door before the car starts to move under the automatic control of relays 87 or 88. Oncethe car gate or any hatchway door is opened, the interlock switches g and ds respectively opened thereby, prevent movement of the car. The interlock switches g and dc are reclosed, upon reclosure of the car gate and hatchway door, and permit the relays 87 or 88 to be energized and subsequently effect the automatic movement of the car.

Either one of a pair of relays 83. and 84 isselectively energized through normally open contact members of relays l and 2, respectively, and the'normally open contact members of the calleregistration relay which have been closed in response to the actuation of the corresponding push-button switch, when the contact members 8 or 9, depending upon Whether the car is moving up or down, respectively, engages the EU or FD segment corresponding to the floor for which a call has been registered. The opening of normally closed contact members on relays 83 or 84, caused by the energization thereof, interrupts the circuit for energizing either relay 87 or 88 to prevent the latter being effective to cause the elevator car to proceed to the predetermined floor corresponding thereto.

A relay 89 is employed having normally open contact members 1) thereof which are connected in parallel with normally closed contact members a of relay '70 and which close to establish a holding circuit for maintaining energized either of the. relays 87 or 88 and and 89 itself, at certain times when the normally closed contact members a, ofrelay 70 are open. I

The floorselector FS is additionally provided with three. segments TTP, lTPand BTP disposed in relative positions corresponding, respectively, to the positions of the elevator car at the top terminal floor, floor #1 and the basement floor (see Fig. 6). Segments TTP and lTP are disposed in alinement and a contact member 14a on the brush-carriage 4 of the floor selector FS is adaptedto engage either of the segments in accordance with the position of the elevator car and connect them to the supply conductor L2.

A contact member 15 is provided on the brush% carriage of the floor selector for engaging the segment BTP and connecting it to supply conductor L2.

The length of the contact member 14a engages it when the elevator car approaches the top terminal floor, which in the present embodiment is the fourth floor, and before the elevator car enters the up slow downzone for. that floor. Assuming the segment TTP issuch that that the (double-throw switch ,10 is thrown into the position for rendering the relay 87 effective to move the car upwardly after all calls are responded to, the engagement of contact member 14a with segment TTP completes a short-circuit connection around the coil of relay 87, thereby effecting its deenergization. When relay 87 is deenergized a circuit is completed for energizing the high-speed inductor relay H and thus when the inductor relay H passes the high-speed inductor plate 4HU, the deceleration and subsequent stopping of the elevator car at floor #4 is effected.

The length of the segment IT? is such as to cause the contact member 14a to engage it dur ing the descent of the car toward floor #1 before the car enters the down slow-down zone for fioor #1 and such that the contact member 14a engages it during the ascent of the car to floor, #1 before the car enters the up slow down zone for floor #1. Thus, whether the elevator car is descending or ascending toward floor #1, the engagement of contact member 14a with the segment 1T1? completes a shortcircuit connection around the coil of relay 88, thereby effecting the deenergization thereof. The deenergization of relay 88 effects the energization of high-speed inductor relay Hand the car is subsequently decelerated and stopped at floor #1; V

The engagement of contact member 15 with segment BTP completes a circuit for energizing relay 87., By. employing normally closed contact members f of relay 87 in the circuit for energizing relay 88, relay 88 is deenergized when the car is at the basement floor, while relay 8'7 isenergized to cause the elevator carto automatically ascend. The length of the segment BTP is such that the contactmember 15 disengages it a short interval of time after the contact member 14a engages the segment lTP.

Thus, once the elevator car begins to ascend towards floor #1 and contactmember 15' dis engages the segment BTP, both relays 87 and 88 are deenergized and the circuit for energizing the high-speed inductor relay H completed thereby to effect the subsequent deceleration and stopping of the elevator car at floor #1.

While I have illustrated an embodiment of my invention in which the elevator is biased either to the upper terminal floor or the first floor, after a predetermined time from the complete response to the .last call registered, it should be understood that any other floors may be selected for the same purpose and the stopping thereat effected by'additional segments and contact members corresponding to segments TTP and lTP and contact members 14a and 15.

A knife-switch 16 is provided in the energizing circuit for relays 87 and 88 for opening the circuit permanently and thus preventing the automatic movement of the elevator car to a predetermined position after the complete re sponse to the last call registered. In other words, by opening the knife-switch 16, the elevator-car is caused to remain at the floor corresponding to the last call registered.

In order to simplify the control diagram, details of a floor control or door-operating system are omitted. In the subsequent description of my invention, the elevator car'gate and the hatchway doors for the various floors willbe described as manually operated because no mechanism for effecting the automatic operation of the doors is shown, However, it. should be understood that by employing the call-.registerv ing relays, such as 14, 13, 23, etc., to control a door-motor, the opening and closing of the doors may be readily effected automatically.

Furthermore, it should be understood that any other mechanism or method for automatically controlling the operation of the car-gate and hatchway doors may be readily employed in conjunction with my invention.

As previously mentioned, the control system, embodying my invention and shown in Figs. 1, 2 and 3, is illustrated as adapted to a building having a basement floor andfour other floors designated #1, #2, #3 and #4.

Let. it be assumed that the elevator car is stopped at floor #1, that the car-gate and hatchway door at the floor are closed, and that a call is registered at floor #4 by a passenger op-' erating the push-button switch 4D.

The operation of the switch 4D closes a circuit for energizing the main coil 14M of relay 14 whereby the relay 14 is actuated to close its normally opened contact members a and b and to open its normally closed contact members 0 and d, which circuit extendsfrom supply conductor Ll (Fig. 2) through conductor 1'7, push-button switch 4D, conductors 18 and 19, coil 14M and conductor 20 to supply conductor L2.

The closing of contact members a of relay 14 establishes a holding circuit for the coil 14M, because the contact membersa are connected in parallel with the push-button switch 4D. Thus,

although the push-button switch 4D, is released, relay 14 is maintained in an actuated condition to effect the. registration of the call.

The closing of contact members b of relay 14 (see Fig. 3) prepares a circuit for energizing, selectively the relays 83 and 84 in the manner to be hereinafter described.

Relays 81 and 82 are bothenergized at the time that the elevator car is stopped and no other calls exist. The circuit for energizingrelay 81 extends from supply conductor L1 (see, Fig. 2) through conductor 25 to the pointj26;

and thence in two parallel branches to supply conductor L2. One of the branches from point 26 extends therefromthrough the coil of relay 81, conductor 26a, through contact members '0 and. d of relay 14, contact members c and d of relay13, contact members 0 and d of relay 23,

contact members 0 and d of relay 12, contact members 0 and d of relay 22 andcontact members c'of relay 11, all in series, to the point 2'7, thence through two parallel branches one. of

which extends through conductors 28 and 29, segment lFU on the floor selector FS, contact conductor L2.

The other branch of the parallel circuit extending frompoint 26 extends through the coil of relay 82, through conductor-40, contact members d and c of relay 2B and contact members (1 of relay 21, in series, to the point 41', thence through. two parallelbranches, the one extending through contact members 0 of relay 21 and contact members d otrelay 11 to the point 27 thence to supply conductor L2 as previously traced and the other branch extending through conductors 35 and 36420 the segment lFD on the floor selector and thence to the supply conductor L2, as previously traced.

It will thus be understood that the circuit for energizing relay 81 is openedwhen contact members c and d of relay 14 are opened by the actuationthereof in response to the call registered at the fourth floor as assumed. 1

The deenergization of relay 81 efiects the closing of contact members b thereof and they in turn complete a circuit for energizing relay 38, whichextends from supply conductor L1, (see Fig. 2) through conductor 43, the coil of relay and conductor 45 to supply conductor L2.

The energization of relay 38 completes a circuit for energizing relay 80, which circuit'extends from supply conductor L1 (see Fig. 2)

members a of relay '70 (deenergized at this time), conductor. 47, in series through normally closed contact members I) of relay 83 and con- 38, conductor 44, contact members b of relay 81 through conductor 46, normally closed contact tact members b of relay 84, (both deenergized .at this time) through conductor 48, coil of relay 80, conductor 49, contact members b of relay 38, (now closed), conductor 50 to thepoint 51 on Fig. l and thence by conductor 52 to supply conductor L2.

The energization of relay efiects the closing'of contact members 0. thereof to prepare a circuit for energizing the relays 1 and 6, and also effects the closing of contact members e thereof to effect the energization of relay 42 when the door andgate interlock switches ds .and g are closed.

Contact members 1 of relay 80, when closed 'by the energization of that relay complete a cir-' cuit for energizing relay 89 which circuit extends from supply conductor L1 (Fig. 2) through con ductor 46, contact members a of relay '70, con'- ductor 47, contact members b of relay83-and contact membersb of relay 84in series, conductors 48 and 48a, coil of relay v89, conductors and 91, contact members 1 of relay 80 and conductors 92 and 93 to supply conductor L2.

- Contact members b of relay 89, when closed by energization of that relay, complete a hold-.

ing circuit which shunts the nor'mally'closed contact. members a of relay '70 :and thereby vmaintains the'relays 80 and 89 energized.

Let it be assumed that the door and gate interlock switches ds and g have closedpindicating that the elevator car isin a safe condition for starting. The closingof the switches ds and g completes a circuit for energizingthe relay 42, which extends from supply conductor L1 (see Fig. 1) through all of the dcor'interlo'ck switch-.

es d's in series, through the gateinterlock switch. g,'through conductor 53, contactmcmbers e of 1 relay 80, conductors 54, 55, 56, coil of relay 42 and conductor 57 to supplyff eonductor L2.

Relay '42, when energi'ad'coinpletes a circuit for energizing relays 1 and 6, which circuit extends from supply conductor L1 (Fig. 1) through the safety circuit including the previously described safety switches, through the stop switch suitably identified, coil of relay 6, conductor 58,

coil of relay '1,'conductor 59, contact members US on the stopping inductor relay S, conductor 60, contact members d of relay 2, conductor'fil; contact members a of relay 81,'conductor 62, 1 contact members a of relay 83, conductor 63,--

tablish a holding circuit for maintaining the re-' lays 1 and 6 energized. I

Contact members I) and c of relay 1 when closed by the'energization of relay 1 complete a circutfor energizing the generator field winding GF which circuit extends from supply conductor L1 (Fig. 1) through conductor 66, contact members b of relay 1, conductor 67, generator field Winding GF, conductor 68, contact members 0 of relay 1, conductor 69, resistors R1 and R2 in series, and conductor 71 to supply conductor L2.

Simultaneously with the energization of the generator field winding GF, the contact members a of relay 1 and the contact members of relay 6 complete a circuit for energizing relay 39 and the coil BC of the motor brake B, which circuit ,extends from supply conductor L1, through conductor 66, contact members b of relay 1, conductors 67 and 72, contact members a of relay 1, conductor 73, contact members of relay 6,

thence through two parallel branches compris- 'ing, respectively, the coil of .relay 39 and the brake coil BC, tothe point 74, thence through conductor to supply conductor L2.

Assuming,'of course, that the motor DM is driving the armature GA of the generator G, ;the energization of the generator field winding GF causes the generator G to build up a voltage across its brush terminals which results in a flow] of current in the loop-circuit comprising the winding of. the armature MA of the elevator driving motor M. The brake coil BC, beingenergized simultaneously with the energization of the, field winding GF, releases the brake shoe BS from engagement with the brake'drum BD.

The armature MA of the motor M thus starts to rotate at slow speed,'incidently effecting the re tation of the hoist drum D to wind up the cable Ca thereon in such manner that the elevator car C 'ascendsin the hatchway. at, slow speed.

Contact members 0 of relay 39, when closed by the energizati'on of that relay, complete'a shunting circuit around contact members e of relay 80, which circuit is clearly shown in Fig. 1,

and thus establish a holding circuit for maintaining the coil of relay 42, energized, independently of whether or not the contact memberse ofrelay remain closed.

Contact members a of relay 39, when closed by the energization of that relay, complete a circuit for energizing relay 70 as well as partially completing a circuit for energizing the coil 3L of the high-speed inductor relay H, the

latter circuit ofwhich will be traced in detail,

hereinafter. The circuit for energizing relay 70, which is completed by the closing of contact members a of relay 89, extends from supply conductor L1 (Fig. 1) throughconductor 76, contact members a of relay 39, conductor 77, coil of relay 70 and conductor 52 to supply conductor L2. 7

The closing of contact members of relayl, eifected by the energization of that relay, com

pletes a circuit forenergizing relay GR5 which circuit extends from supply conductor L1 (Fig. 1), through conductor 78, contact members f of relay 1, conductor 79, contact members UI of intermediate-speed inductor relay I, conductor 85, coil of relayGR5 and conductor 86 to supply conductor L2. The closing of contact members a, of relay GR5 completes a shunting circuit around the resistor R1 in the circuit for energizing the generator field winding GF, which results in an increased flow of current through the field winding GF, a further building-up of the voltage by thege'nerator G, and an increased speed of rotation of the motor M which, of course, effects an increase in the speed of movement of the elevator car to a speed hereinafter designated as the intermediate speed.

By this time, the voltage across the brush terminals jof the motor M is sufficient to energize the coil of voltage-responsive relay 31 and.

cause it to close its contact members.

The contact members of relay 31, when closed, complete a circuit for energizing the relay GRG, which circuit extends from supply con-' ductor Ll (Fig. 1) through conductors 94 and 95, contact members 9 of relay 1, conductor .96, contact members UH of high-speed inductor relay'H, conductor 97 to the point 98, thence through two parallel branches, the one comprising contact members 'a of relay 89, and the other comprising conductors 99, 100 and 101, contact members 0 of relay 80 and conductors 102 and 103, to the point 104, thence through conductor 105, contact members of relay .31, con ductor 106, coil of relay GRG and conductor 107 to supply conductor L2. 7

Contact members b of relay GR6, when closed by the energization of that relay, complete a third branch circuit in parallel with the two branch circuits comprising contact members a of relay 89 and contact members 0 of relay 80 in parallel, and thereby establish a self-holding circuit for the coil of relay (3R6.

Contact members a of relay GR6, when closed by the energization of that relay, complete a shunting circuit'around the resistor R2 and thereby effect an increased energization of the generator fieldwinding GF, which results ulti- -mately. in the elevator car C accelerating to its "highest speed of movement hereinafter designated as high-speed.

Assuming that no other calls are registered between the elevator car and the call registered by the operation of the push-button switch 4D when the elevator car is ascending to the fourth floor in responseto the call registered, the elevator car continues to move at high-speed until 7 the contact member 8 on the brush carriage 4 of the floor selector FS, engages the segment 4FU' thereof, whereupon a circuit is thereby completed for energizing relay 83 which circuit extends from supply conductor L1 (Fig. 2),

through conductor 107, coil of relay 83, conductors 108 and 109, contact members it of relay 1, conductors 110, 111 and 112, contact members.

I; of relay'l, conductor 113, floor selector segment 4FU, contact member 8, conductor 30, con tact members i of relay 2 and conductors 32' and 33 to supply conductor L2.

The contact members 0 of relay 83, when .closed by the energization of that relay, complete a holding circuit for the coil of relay 83,

Which'circuit extends from supply conductor Ll (Fig. 2) through conductor 107, coil of relay 83, conductor 108, contact members c of relay 83, conductor 114, contact members 7) of relay 70, and conductors 115 and 116 to supply conductor led membersd of relay 80, conductors 118, 119 and.

120, coil 3L of inductor relay H, and conductors 121. and 122 to supply conductor L2.

The elevator car, not having reached. the high-speed inductor plate 41117, the energization of the coil 3L of relay .H iscwithout immediate effect. However, when relay H on the car reaches the inductor plate 4l-IU, contact members UH of relay H open, in. the manner previously described, to interrupt the circuit, previously traced, for energizing relay GR6.

The opening of contact members a of relay (1R6, caused by the deenergization of the relay, removes the short-circuit connection around resistor R2 in the circuit of the generator field winding GF and the current through the field winding GF is thus reduced due to the increased resistance in circuit therewith. The reduction in the degree of energization of the field Winding GF effects a deceleration in the speed of the elevator car so that the car moves at intermediate speed.

' The closing of normally closed contact members c of the relay GR6 caused by the deenergization of the rela completes a circuit for energizing the ccil 2L of intermediate speed inductor relay 1, which circuit extendsfrom supply conductor L1, through conductor '76, contact members a of relay 39, conductor 117, contact members b of relay 87, contact members 22 of relay 88, contact members (1 of relay 80, conductors 118, 119 and 120, contact members'c of relay GR6, conductor 123, coil 2L of inductor relay 1 and conductors 124, 121 and 122 to supply conductor L2.

The energization of coil 2L of relay I is of no eifect until the relay I on the car passes the intermediate speed inductor plate 413', at which time contact members UI of relay I open to interrupt the circuit, previously traced, for energizing relay GR5.

The opening of contact members a of relay (3R5, caused by the deenergization of the relay, opens the shortcircuit connection around resister R1 in the circuit of the field winding GF and thus causes additional resistance to be inserted in the field Winding circuit to reduce the speed of the elevator car to slow speed.

The closing of normally-closed contact members b of relay GR5, caused by the deenergization of the relay, completes a circuit for energizing the coil 1L of stopping inductor relay S which circuit extends from supply conductorLl through contact members 01! of relay 80, as previously traced, conductor 118, contact mem-- bers b of relay 6R5, conductor 125, coil 1L of relay S and conductors 121 and 122 to supply conductor L2.

The energization of. the coil 1L of relay is of no effect until the inductor relay S on the car reaches the stopping inductor plate 4811,

at which tin e contact members US of relay 3 open, in the manner previously described, .to

of relay 39. As a result, therefore, the elevator car stops completely, the brake shoe BS is setcn the brake drum BD by the biasing means provided, and the circuit, previously traced, for energizing the coils 3L, 2L and IL of the inductor relays H, I and S,'respectively, interrupted.

The voltage responsive relay 31 is, of course, dcenergized when the voltage across the terminals of the winding of the motorarmature MA falls to zero and the contact members thereof are thus caused to open, but such opening is of no effect because the relay GR6 controlled there.- by has been previously deenergized, as just described.

The opening of contact members a of relay 39 and the opening of contact members 0 of relay 39 interrupts the circuits for energizing relays'YO and 42, respectively. As a result,these latter relays are, therefore, deenergized.

The reclosing of the normally closed contact members b of relay 70 is delayed a predetermined length of time, after the deenergization of the relay such as 10 to 20 seconds, by some suitable time-delay means, such as the dash pot 126, for the purpose of allowing some time in which the car-gate and hatchway door may be opened before permitting the relay 88 to be effective to automatically cause the elevator car to descend to the first floor in the manner which will be hereinafter described.

When the elevator car attains the level of the fioorto which it has moved in response to a call registered thereat, the'contact member 5 on the brush-carriage 4 of the floor selector FS engages the cancellation segment 4CU' and a circuit is thereby completedfor energizing the neutralizing coil 14N of relay 14 to efiect the movement of the relay to its deenergized position and thus effect a cancellation of the call previously registered by the operation of the push button switch 4D. The circuit for energizing. coil 14N extends from supply conductor L1 (Fig. 2) through conductor 17, contactmembers a of relay 14, conductors 18 and 127, coil 141i, conductor 128, segment 4CU,"brush or contact member 5 (see Fig. 3), conductor 129, contact members 0 ct relay GR5 (Fig. 1) and conductor 130 to supply conductor L2.

The-energization of coil 14N effects the'open- 7 ing of contact members a of relay 14 by overcoming the force holding those contact members closed which is exerted by the energized actuat- 25, coil of relay 81, conductor 26a, contact members c ofrelay 14, (Fig. 3)-conductorf131;to the point 132 and thence through conductor 113, contact segment 4FU on the floor selector FS,

contact member 8 on the brush-carriage 4, conductor 30, contact members i of relay 2, and conductors 32 and 33 to supply conductor L2.

The opening of the contact members b of relay .field Winding GF, the brake coil BC and the coil 7 r 81, as aresult of the energization thereof, ef-

conductor L2,

' the coil thereof.

It will thus be seen that theelevator caris stopped at the level of the upper terminal floor, namely floor,#4, and that a passenger at floor #4 .fmay' open the hatchway door and car-gate to enter the car. 7

Let it be'assumed, further, that the person registering the call does not open the hatchway door and the car-gate and that no other calls are registered.

- After the expiration of the predetermined time previously mentioned, the contact members'b of relay '70 open to interrupt the holding circuit,

previously traced, for maintaining the relay 83 energized and thereby effect the deenergization thereof.

The deenergization of relay 83 causes the contact members 1) thereof to reclose and complete a circuit for energizing relay 88which circuit extends from. supply conductor L1 (Fig. 2) through conductor 46, contact members a of re lay '70, conductor 47, contact members b of relay 83 and contact members I) of relay 84, conductors 48, 133 and 134, contact members d of relay 82 and contact members at: of relay 81, conductor 135, contact members'c of relay 88, conductors 136 and 137, knife switch 16 (closed), conductor 138, resistor RB, conductors 139 and 140, normally closed contact members 1 of relay87, coil of'relay 88, conductor 141, contact arm 142 ofdouble-throw switch 10 and conductor 143 to supply "conductor L2. 7

The contact members c and e of relay 88, when closed'by the energization'of the relay, complete circuits for energizing, respectively, relays 42 811K189. I

' The circuit for energizing relay 42, established by contact members 0 of relay 88, is substantially that previously traced for contact members e of'relay .80,the contact members 0 of relay 88 being connected in parallel with the contact 9 'memberse of relay 80 as shown at the bottom of Fig. 1.

The circuit for energizing relay 89 is substantially that previously traced therefor, contact members'e of relay 88 being. connected in parallel with fcontactmembers f of relay 80 included in the circuit previously traced.

The contact members of relay 42 when closed, complete, at this time, a circuit for energizing relays 2'and 6, whichlcircuit extends'from supplyflconductor L1 .(Fig. 1) through the safety circuit, stop switch, coil of relay 6, conductor '58, coil of relay 2, conductor 144, contact members D of stopping inductor relay S, conductor 145, normally closed contact members e of relay 1, conductors 146. and 147, contact members a of relay- 88, conductors 148, .149 and 64, contact members. of relay 42, and conductor to supply A holding circuitfor maintaining relays 2 and 6 energized independently of. the contact mem bers a of relay 88 is established by contact members e of relay 2 which are connected in parallel with contact members a. of relay 88, as shown in the 'middle of Fig. 1. r 7

It willbe observedthat the -"down direction relay 2 is thus selectively and automatically energized to efiect a subsequent movement of the elevator car downwardly. Y

The brake coil BC and relay '39 are enerfgized when contact members a, of relay, 2 and the contact members of relay 6 close. Thus the brake B is released by coil BC to permit rotation ofthemotor'arrnatureMA and the circuit for energizing the inductor relay coils 3L, 2L and 1L is partially completed by the closing of contact 7 members a of relay 39. I a

Contact members 1 of relay 2, when closed, complete a circuit for energizing relay GR5 which circuit extends from supply conductor L1 (Fig. 1) through conductor 150, contact members as a result of the energization thereof, completes a circuit for energizing relay 70 which circuit has been previously traced.

The elevator car is thus accelerated to intermediate speed when contact members a of relay GRS complete a short-circuit connection around resistor R1 as previously described. The closing of contact membersa' of relay GRG, efiected by means of voltage-responsive relay.31, completes a short circuit connection around resistor R2 to efiect the acceleration of the elevator car to high-speed. i

Assuming that no other calls are registered, the elevator car continues to descend at highspeed until the contact member 14a on the floor selector brush-carriage engages the segment lTP. v 7

The engagement of contact member 14a with segment lTP closes a short circuit around the coil of relay 88 and the normally closed contact members 1 of relay 87 as clearly shown in Fig. 2 and thus effects the deenergization of relay 8'8.

The resistor RB is, thus, obviously employed to prevent a shortcircuit across the supply conductors L1. and L2 by limiting the current through the circuit completed by the engagement of contact member 14a and segment lTP.

When relay 88 is deenergized, the contact members'b thereof close to complete a circuit for energizing the coil 3L of the inductor relay H which circuit has been previously traced.

until. opened'manually by a passenger desiring to be transported from floor #1. It will be seen, I

therefore, that, thus far, a novel control system has been described for effecting, automatically, the movement of an elevator car to a predetermined position after the complete response to all registered. calls, by means independent of the push-button switches at the floors or in the car and'independent of the call-registration retional features of my invention, let itbe assumed that when the elevator car was descending at high-speed from floor #4 and as it was passing floor #3, a call was registered at floor #4 by the operation of the push-button switch lays. which are operable in response to the op In other types of elevator control systems would, under such circumstances, continue to travel to the predetermined position, under the influence of a biasing control, such as floor #1, and would not respond to the call at the fourth floor until it had arrived and stopped at floor #1.

In this respect, however, my invention effects a distinct advance in the art for the reason that I cause the elevator car, under the circumstances assumed, to slow down and stop at the next floor it approaches, the slow-down zone of which the car has not already entered, then reverse and respond immediately tothe registered call without proceeding to the predetermined position such as floor #1. In other words, my invention effects a response of the elevator car to registered calls in preference to the automatic biasing control for returning the. car to a predetermined position after all registered calls have been responded to.

Under the conditions assumed, therefore, the operation of push-button switch 4D completes a circuit for energizing the main coil 14M of relay '14, which circuit has been previously traced, and the contact members a of relay 14, when closed, complete a holding circuit for coil 14M as previously described. Although contact members 0 and d of relay 14 open, relay 81 does not immediately become deenergized because a holding circuit is maintained therefore by contact members f of relay 88.

As the elevator car passes below floor #3, contact member 9 on the floor selector brushcarriage leaves the segment 3FD and engages the insulating member between segments 3FD and 2FD. A circuit for energizing the coil of relay 82 is thus interrupted, momentarily, and relay 82 becomes deenergized.

Contact members b of relay 82 are connected in parallel with contact members b of relay 81 and thus the reclosing of contact members I) of relay 82, upon the deenergization thereof, completes a circuit for energizing relay 38 which has been substantially previously traced to include contact members b of relay 81. Contact members I) of relay 38, when closed by the energization thereof, complete a circuit for energizing relay 80, which circuit has beenpreviously traced.

' As the elevator car continues to descend from floor #3, the contact member 9 on the floor selector brush-carriage engages the segment'2FD and thus recloses the circuit for energizing relay 82 which circuit extends from supply conductor L1 (Fig. 2) through conductor 25, coil of relay 82, conductor 40, contact members d and c of relay 2B, in series, (Fig. 3) contact members d and c of relay 21, in series, contactmembers d and c of relay 11 in series, contact members d of relay 22, conductors 155 and 156, segment 2FD, contact member 9, conductor 37, conterrupts the circuit previously traced for energizing relay 80, and thus the latter is deenergized. v

The opening of Contact members f of relay 80, as a result of the deenergization of that relay, interrupts the holding circuit for relay 89, maintained thereby, and thus relay 89 becomes decnergized.

When relay 82.became re-energized by'the completion of the circuit for energizing it as a result of the engagement of contact member 9 with the segment 2FD, it interrupted a holding circuit maintained for relay 88 by contact members c of relay 82, which circuit extends from supply conductor L1 (Fig. 2) through conductor 46, contact membersa of relay 70, conductor 47, contact members I) of relay 83 and contactmembers b of relay 84 in series, conductors 48, 133.

and 157, contact members d of relay 88, conductor 158, contact members c of relay 82, conductors 159 and 137, knife-switch l6, conductor 138, resistor RB, conductors l39 and 140, contact members f of relay 87, coil of relay 88, conductor 141, contact arm 142 of double-throw switch 10 and conductor 143 to supply conductor L2.

Thus relay 38 becomes deenergized and the and the re-energization of relay 38,relay was.

de-energized as a result of the opening of con-' tact members 12 of relay 38. Contact members 6 of relay 88, having previously opened as a result of the deenergization of relay 88, the opening of contact members i of relay 80 interrupted the holding circuit maintained thereby for energizing relay 89. Thus relay 39 became deenergized and because the contact members a of relay 70 and contact members I) of relay 89 are simultaneously open, relay 80 cannot become reenergized when contact members b'of relay 38 reclose.

When contact members (1 of relay 80 recloseias a result of the decnergization of relay 80, a circuit is completed thereby for energizing the coil 3L of the high-speed inductor relay H.

As the high-speed inductor relay H on the elevator car reaches the level of the down high-speed inductor plate 2HD, the contact members DH of relay H are opened and the car subsequently decelerated and stopepd in the manner previously described by the successive operation of relays H, I and S.

It will thus be clear thatalthough the elevator car was under the influence of relay 88 at the time it was automatically proceeding .to floor #1 after responding to all prior registered calls, nevertheless, the registration of a call, behind the elevator car in its direction of movement, effected an immediate response thereto which resulted-in the subsequent stopping of the car at the next floor, namely, in the example taken, floor #2. 1

Obviously, itis necessary that the elevator car be out of the slow-down zoneof a floor when a call is registered in order that the car may stop at that floor. In other Words,if the inductor relay H on the elevator car has already passed the high-speed inductor plate for a particular floor, the elevator car must proceed to the high-speed inductor plate corresponding to the nextfloorin order to stop. 7

.The elevator car remains at the floor at which it stops, for a predetermined interval: of time, such as 10; or 20 secondsybecause of the time lag necessary forthe contactmembers a of relay 7% to.rec1ose ,and'thereby complete a circuit for energizingrelayBO.

vAssumingzthen that the predetermined length .ofxtimerequired for the contact members a. or relay 7O toreolose has expired, thenrelay 80 is. energized, thereby, as previously described.

.,,,'The,'closingzof contact members 1 of relay 80, as...a result oi the energizationthereof, completes a circuit for energizing: relay 89, which circuit has beenpreviously traced, and the closing of contactmembers e of relayBO completes a circuit for energizing relay .42, which circuit has also been'previously traced.

The closing of the contact members of relay v42 completes a. circuit for energizing relays 1 and 6, which circuit has been previously traced. It ,willbe notedjthat the ,up direction relay 1 is energized. i a 1 :Assumingnoother calls to be registered, the elevator car startstojmove upwardly, acceleratestou-highspeed, deceleratesandstops, in the manner previously'described; at floor #4.

It remains at floor #4 a predetermined length of time as a result of the time lag on relay in order to j allow the hatchway door at the fourth floor and the car gate to be opened. The

, passenger, upon entering the elevator: car, re-

.closes the hatchway door and the car-gate and if he desires to go to floor #1 has the option of waiting until'the car is automatically returned to floor #1, as previously. described, or or oper-' ating the push-button switch 1G in the elevator car toeflectimovement thereof to floori#1.

The operation of push button switch 19 in the elevator car'to cause the latterstomove to fio0ri#1 .efiects a sequenceof operation which is substantially the same as previously'describcd for theautomatic movement of the car to the firstzfloor butdiifers therefrom in some respects. The initial steps in the sequence of operations as a result of the operation of push button switch 1C wi1l, therefore, be traced in detail.

The closing of the switch 10 completes a circuit for energizing the mainvcoils 11M and 21M of relays 11 and 21 respectivelywvhich.circuit extends from supply conductor L1 (Fig. 3)

through conductors 19 0, 191 and 192. to the como men contact terminal 193 of push button switch 1C, thence through two parallel branches, the one extending through the contact member 194 of switch 1C,theterminal 195 of switch 10, conductors 196 and 197, coil 11M and conductor 198 to th'epoint199, the other branch extending through the contact member 194 of the switchlC, thecontact terminal260 of the switch 1C, conductors 201,202 and203, coil 211Viand conductor 294 to the point 199, whence the cire cuit extends through conductor 205 to the supply conductor. L2. I

It will'be remembered that at this time relay ,88,*iS energized and that its contact members 1 are maintaining a holding circuit for the coil of relay fil, which circuit extends from supply conductor Ll (Fig. 2) through conductor 25, coil of relay 81, conductorsZfia, 205, contact members ofrelay 88 and conductors 207 and 208 to supply conductor L2. Thus the opening of .the :contact members cuand ,d of relay .11

and the opening-of contact members s and (1 of relay 21, as a result of the energization of those relays, interrupts only the circuit for energizing relay 32, which circuit includedrcontact memb rs 0 and of, all of the relays 2B, 21, 11, 22, 12, 23 and 13, the contact membersd of relay 14, conductors 131 and 113, segment iFU and 2), contact member 8 on the floor selector brush carriage which connected to supply conductor L2 as previouslydescribed.

The closing of contact members b of relay 82, upon the deenergizatio'n thereof, completes-the previously traced circuit for energizing relay 38;and as a result of theenergization of relay 38. the contact members of the latter relay u :290 close to complete the. previously traced circuit for energizing relay 8%. i r e The closing of contact members e of relaya completes the previously traced circuit for energizing relay 42 and the closing of contact members f of relay 80 completes-the previously traced circuit iorenergizing relay 89,,

Because relay 82 is de-energizedathe contact members, a thereof are closed and thus the closing the contact members of relay i2 completes the circuit for energizing the down direction relay d relay'c, which circuit has'been described above. h V

The subsequent sequence of events inthe acceleration of the elevator car downwardly to ospeed'shouid be understood without a detailed description thereof.

When the elevator car, moving downwardly at high speed, attains a position in the hatchway oh that the contact member'Q on the brush iage or" the floor selector engages the segment circuit is completed thereby for, enerelay 84, which circuit extends from supy nductor L1 (Fig. 2) through conductor 18-2 coil'oi relay 84, conductor 173, contact members h of relay 2, conductors 110, 111 and 209, contact members 2; ofrelay 21, conductor 36, segment on the floor selectoncontact member-9 and thence to supply conductor L2, as previously described. 1

The closing of contact members c of relay 84, as aresult of the energization thereof, completes a holding circuit for maintaining relay 84 energized through the contact members 0 of relay .70 as previously describedx i The opening of; contact members b ofrelay'84, as a result of the energization thereof, interrupts the previously maintained circuit heretofore described for energizing relay 88 and as a result relay 88 becomes deenergized.

It will thus be seen that a preference is given .to the established call instead of to the automatic biasing control effected by relay .88.

The opening of contact members b of relay 84 also interrupts the previously traced circuit for energizing relays S0 and 8E) and they, therefore, become deenergized. V

The closing of contact members b of relay 88 and the closing of contact members (2 of relay 80 thus complete the previously traced circuit for energizing the coil 3L of: the high speed inductor relay H.

The subsequent sequential operation of inductor relays H, I and S when the elevator car successively passes the inductor plates lHD, 11D and 18D should be understood from previous descriptions thereof and it will, therefore, not be repeated.

When the elevator oar stops at floor #1, con- ,1 tact members 5 and 7 on the floor selector brush and 2lN wherebythe cancellation of the call.

registered thereon by the operation of the push button switch 1C is cancelled.

The reclosingof contact members (1 of relay 21, as a result of theldeenergization thereof completes the circuit through the segment lFD and contact member 9 ofthe floor selector forreenergizing relay 82. -The opening of contact members b of relay 82interrupts the previously. described circuit for energizing relay 38 and the latter thus becomes deenergized.

When contact members 0 of relay '70 open after the predetermined time lag above-mew.

tioned, the holding circuit, previously traced, for maintaining relay 84 energized is interrupted thereby and as a result, relay 84 becomes deenergized. r

The elevator car is, therefore, stationed at floor #1 and the passenger who descended therein from floor #4 may open the car-gate and hatchway door at floor #1, leave the car and '-Ireclose the car-gate and. hatchway door, after which the car waits indefinitely at floor #1 until a subsequent call is registered. t I

In order to still further explain the operation of the control system. embodying my invention, let it be assumed that under the conditions above-described, that is, as the elevator car is being caused to move automatically to floor #1 from floor #4 under the influence of relay 88 and is just passing the level of floor #3, an up call is registered at floor #2 in advance of the car, by the operation of the push-button switch 2U. V

The operation of switch 2U completes a circuit for energizing the main coil 12M of relay 12 which circuit extends from supply conductor Ll (Fig. 3) through conductor 160, contact members of switch 2U, conductors 161 and 162, coil 12M and conductor 163 to supply conductor L2 The contact members a of relay 12 close, as a result of the energization of the relay, and being connected in parallel with the switch 2U, establish a holding circuit for maintaining coil 12M energized, although the push button switch -2U is is released. 1

The opening of contact members 0 and d of relay'12 interrupts the circuit for energizing the relay 82 previously maintained bythe engage- ..ment of-contact member 9 with segment 3F!) on the floor selector-"which circuit extends from supply conductor Ll (Fig. 2) through conductor 25, coil of relay 82, conductor 40, contact members dand c of relay 2B (Fig. 3), contact members d and c of relay 21, contact members at and'c of relay 1l,'contact members 11 and c of relay 22, contactmembers d and c. of relay 12, contact members d of relay 23, conductors 164 and 165, segment 3FD, contact member 9 on the brush-carriage 4, .conductor 37, contact members i of relay 1 and- conductor 32 and 33 to supply conductor L2. i The closing of contact members b of relay 82, upon the deenergization of the relay, completes circuit for energizing relay 38, which circuit has been previously traced.

The opening of contact members I) of relay 38, as a result of the deenergization of the relay, interrupts the circuit previously maintained thereby for energizingrelay 80, which circuit is bs-fore'it disengagedthe segment 3FD, relay 82 v would not be deenergized. As will be apparent;

from the subsequent sequence of operations it is necessary that'relay 82 be de-energized in order to efiect a deenergization of relay 88 and an immediate preferential response to the registered call.

As the elevator car continues to descend, the contact member 9 engages the segment 2FD before the inductor relay H comes within the down slow down zonefor floor #2. Thus relay 82 is again energized by the completion of a circuit therefor through segment 2FD and contachmember 9, which circuit is substantially the same as that previously traced and which includes thesegment 3FD. i

The energization of relay 82 effects'the opening of contact members 1) thereof,- and thus the circuit for energizing relay 38 is interrupted with the result that relay 38 becomes deenergized.

The opening of contact members '0 of relay82 interrupts the holding circuit maintained thereby for energizing relay 88, which circuit has been previously traced, and thus relay 88 becomes deenergizedg As a result of the opening of contact members 1 of relay 88, theholding circuit for the coil of relay 81 maintained thereby is interrupted and since the contact members c and d of relay 12 are open at this time due to the registration of a call by the relay 12, the circuit for energizing relay 81 through the segment 2FD on the floor selector and contact member 9 is not complete.

Thus relay 81 becomes deenergized by the open- During the interim between the de-energization and'the re-energization of relay 38, relay 80 was, of course, deenergized as previously described. As a result of the de-energization of the relay 80jthe circuit for energizing relay 89 was interrupted by the opening of contact members I ofxrelay 80 and, as a result, relay 89 became de-energized before relay 38 became reenergized. i

As a result of de-energization of relay 89, relay 80 could not be re-energized upon the reenergization of relay 38 because the contact members b of relay 89 which are connected in parallel with contact members a of relay 70 and which serve to complete the holding circuit for relay 80, are open.

Thus,,. relay 80 remaining de-ener'gized, the

contact members d thereof completea circuit for dov/n zone, that is, it passes the down" highspeed inductor plate 2HD-for 'fioor #2.

As a result, contact members DH-of relay-H open tokeffe'ct de-energization of relay (ERG. 'Ihesubsequent sequence of operation untilthe elevator car is-stopped completely-at floor"#2 need not be--described here indetail because it is similar to that already described.

The passenger at floor #2 manually opens the hatchway door at the floor and the'car gate,-

entersfthe car and reclos'es'the door and gate behind him. r

' Assuming that the passenger' who entered the elevator-car at floor #2 desires to ascend to floor #e; such n ovementof the elevatorcar to floor "#4 without'proceeding to floor #1, is effected by the operation of pushbutton switch 4G in the elevator car. The sequence of operations effected by the operation of push button switch-AC" is believed to be sufiiciently' under at the basement floor: by the operation of the push-button switch BU thereat. The operation of'the switch BU completes-a circuit for energizing-the main coil ZBM-of relay 2B which circuit extends from supplyconductor Ll, (Fig. 3), through conductors 166'and 167, switch BU, conductors 168' and 169,-coil 2BM and conductor 1'70 td'supp'ly conductor L2.'- The normally open contact members a of 1 relay 2B are connected in parallel withthe switch BU and the closing thereof," as 'a-result'of the energization of relay 2B, completes a holdingcircuit for maintaining relay 2Benergized. I a

' *Tlie op'ening of contact members 0 and d of' relay 2B in-terrupts the-circuit by which relay 82 is'renergiz'ed, which circuit extends from. supply conductor Ll (Fig. 2) through conductor 25',

coil -of--'r'elay=- 82, conductor 40, contactmembers dand' c of relay 2B (Fig-. 3), contact members d of relay 21 to the point 41, thence through' -two parallel' branches one comprising the segment lFD and contact member 9 of the floor selector- "connected to supply conductor L2 as previously described-,' and the other comprising contact membersjc of relay 21,-contact 'members d of relay 11, segment lFU and'contact member 8, the latter: being connected to the supply conductor L2xiare =prev'iouslydescribed.-

Therefore, whent'the contact members. 0 and d?Of Ie1ayi;2B are opened, as a result oi the energization of relay 2B, the circuit forenergiz ing relay 82 is interrupted and the latter be comes zdeenergized. Thereclosingof normallyrclosedcontact members b 'of-relay 82 completesthecircuit, already described, for energizing relay 3,8, whichthus.

becomes energized. I Y c The closing of contact'members' b of relay 38,

asa result of the energization thereof, com

pletes' the-previously' described circuit for energizin'gj'relay SOTand thus relay becomes ener- V gizei The-closingof' contact members -e and f of relay 80 complete the individual circuits, previously traced, for energizing relays 42 and 89,

' respectively:

The closing of the contact members of relay 42 completes a circuit for energizing the relays '2 and 6, whichextends from supply conductor- Ll-(Fig. 1) through the safety circuit, stop switch, coil of relayfi, con'ductor58, coil of relay- 2, conductor 144, contact members D8 of stop-- ping inductor relay S, conductor 145, contact" memberse of relay 1,:' conductor 146, contact members a of relay 82,. conductor 1'71, contact members a of. relay 84, conductor 1'72, contact members b' of re1ay'89, conductors 149 and 64', contact members of relay 42 and conductor 65 to supply conductor L2. a

It will thus be seen that the down direction relay 2 is selectively energized to effect the descent of 'the elevator car. I

It is deemed unnecessary to trace in detail the steps in the acceleration of the car because.

may attain high speed in caseswhere it isre quired to move onlyfthe distance between adjacent floors. 7

' As-{the elevator car descends, the contact member-9 on the brush-carriage of the floor selector engages the segment BFD and a circuit is thereby completed for energizing relay 84 which circuit extends from supply conductor-L1 (Fig. 2) through conductorlOT, coil or relay 84, conductor 173, contact members h of relayv 2,. conductors 110' and 111, contact members biof relay 23, (Fig. 3) conductor 174, segment TBFD, contact'member 9, conductor 37, contact members z' of relay Land-conductors 32-and 33 to supplyconductor L2. p

The opening of contact members I) of relay 84 interrupts the circuit for energizing both of the relays 80 and :89,;which circuit has already been traced, and thus the latter two relays become deenergized;

I The reclosing of contact members (1 of relay, 80 completes a .ci'rcuitior energizingthe coil 3L of inductor relay fi which circuit already beenatracedr Y a V The subsequent deceleration andstopping of the elevator car by the inductor relaysH, I and S as the car moves past inductor plates BHD,

of their operation is omitted. V I 'Whenthe' elevator car'arrives substantially at the basement floor, contact member '7 on the brush-carriage of the fioorselector engages the segment BCD and a circuitiis thereby com pletedfor energizing the neutralizing coil 2B N of relay"2B which circuit extends from'supply conductor L1 (Fig. 3)' through conductors 166- and 167, contact. members a of relay-2B,,con-

ductors 168 and'169,"coil-2BN," conductor 175;

segment BCD, contact member '7, conductor l76,'- contact member-3d of relay GR5' (Fig. 1), and

BID, andBSD, respectively, (Fig. 6) is thought to be well understood and adetailed description conductors 1'77 and 130 to supply conductor L2. 7

The contact members a ofrelay 2B are thus caused to open, as will be'understcod from previous description oif the operation of the calltained by contact members a is interrupted whereby the main-coil 213M of relay-2B is'deenergized. The call registered at the basement registering relays, and the holding circuit mainfloor by the operation of push button switch BU is thus cancelled. V I

- The reclosing of contact members at of relay 2B as a result of the de-energization of relay 2B completes a circuit for re-energizing relay 82 which extends from supply conductor L1 (Fig. 2) through conductor 25, etc. to the point 178 common to the contact members 0 and. d of relay 23 (Fig. 3) and thence through conductors 1'19 and 174, selector segment BFD, contact member 9, to supply conductor L2 as previously traced. I

The opening of contact members b of relay 82, as a result of the energization ofrelay 82, interrupts the circuit for energizing relay 38 previously maintained thereby and thus relay 38 becomes deenergized. I

Let it be assumed, therefore, that the elevator car stops properly at the basement floor and, as a result of the time delay in the reclosing of contact members 22 of relay '70, waits a predetermined length of time for the passenger at the basement floor to open the hatchway door thereat and the car-gate.

Assuming that the car-gate and hatchway door at the basement'fioor are not opened, the opening of contact members 0 ofrelay 70 after the expiration of the predetermined time opens the holding circuit for maintaining the relay 84 energized, which circuit extends from supply conductor L1 (Fig; 2) through conductor 107, coil of relay 84, conductors 1'73 and 180, contact members 0 of relay 84, conductor 181, contact memberscof relay 70 and conductor 116 to supply conductor L2: I

Contact member 15 on the floor selector brush-carriage being now] in engagement with the segment BTP, the deenergization of relay 84 and the reclosing of normally-closed contact members 1) thereof effects the completion of a circuit for energizing relay 87 which circuit extends from supply conductor L1 (Fig. 2) through conductor 46, contact members a of relay 70, conductor 47, contact members I) of relay 83, contact members b of relay 84, conductors 48, 133 and, 134, contact members (1 of relay 82, contact membersd of relay 81, conductor 135, contact members c'oi relay 38, conductors 136 and 187, knife switch 16, conductors 138 and 182, resistor RT, conductors 183 and 184, coil of relay 8'7, conductor 185, segment BTP, contact member 15 on the floor selector brush-carriage, and conductor 186 to supply conductor L2.

Resistor RT is provided fora purpose similar to that of resistor-RB and it limits the shortcircuit current where relay 87 is shunted by the engagement ofsegment BTP and contact member 15.

I The opening of contact members f of relay 8'? interrupts the circuit for energizing relay 88 which would otherwise be energized because the contact member 14ais not in engagement with the segment lTP atthe time that the elevator car is at the basement floor.

The closing of normally opened contact members e of relay 87 completes a circuit for energizing relay 89 which circuit extends from supply conductor Ll (Fig; 2) to the coil of relay 89 as previously traced, thence through conductor 90, contact members 0 ofrelay 87 and conductor 93 to supply conductor L2. 7

The closing of contact members I) of relay 89 completes a" holding circuit for maintaining relay 89 energized independently of whether or not thenormally closed contact members a of relay '70 are closed or open.

The normally open contact members 0 of relay 87, when closed, complete a circuit for energizing relay 42 which circuit extends from supply conductor L1 (Fig. 1) through the door and gate interlock switches ds and g in series, conductors 53 and 187, contact members 0 of relay 8'7, conductors55 and 56, coil of relay 42 and conductor 57 to supply conductor L2.

The contact members of relay 42, when closed by the energization of the relay,-comp1ete'a circuit for selectively energizing relays 1 and 6, which circuit extends from supply conductor L1 (Fig. 1) through the safety circuit,'stop switch, coil of relay 1, conductor 59, contact members ,US of stoppinginductor relay S, conductor 60,

normally closed contact members d of relay 2, conductors 61 and 188, contact members a of relay 8'7, conductors 189,149, and 64, contact contact members a of relay 8'7, by normally opened contact members d of relay 1 which are connected in parallel with the contact members of relay 87.

It will thus be observed that the up direction relay has been energized to effect the movement of the elevator car upwardly.

The succeeding steps in the acceleration of the elevator car to intermediate speed or high speed will not be traced because they will be understood from previous description.

Let it be assumed therefore that the elevator car has accelerated to high-speed upwardly. When the contact member 15 disengages the segment BTP, the circuit for energizing relay 87, previously traced, is interrupted thereby and the de-energization of elay 89 and the energizaticn of the relay 3L of the high speed inductor relay H efiected, respectively, by the opening of contact members e of relay 87 and the closing of contact members b of relay 8'7.

The subsequent steps in the deceleration and stopping of .the elevator car by the operation of the inductor relays H; I and S when the elevator car passes inductor plates lHU, lIU,

automatically'returns to floor #1 whether the calllast registered. and responded to is above or below floor #1.

Although the present embodiment of my invention is illustrated for a condition wherein a predetermined position or floor to which the car is automatically returned after the complete response to all registered calls is adjacent to the lowermost floor, that adjacent to the basement floor, it should be understood'that the segment BTPpn the floor selector may be .readilylengthened to maintain the continued energization of relay 8? whereby the car will move any predetermined distance instead of merely the distance between adjacent floors. Thus,- floor #2 or 11001" #3 may be taken as the length of this specification, for the reason that the foregoing description and assumed instances of operation are deemed to comprehensively explain and describe the structure and method of operation of the control system illustrating and embodying my invention.

It should be understood, moreover, that although the above assumed instances of operation describe merely one call as being registered at a time, it is possible to register a plurality of calls to which the elevator car will respond.

in succession. For example, if the elevator car is proceeding to the first floor as the predetermined position to which it returns after the complete response to the last call registered, and a plurality of calls are registered between the car and the first floor, the car will stop successively at the various floors at which calls have been registered.

In furtherexplanation of the operation of the control system illustrating the present. embodiment of my invention, it should be understood, also, that in the event .a pluralityof up calls and a plurality of down calls'are registered substantially at the same time, the elevator car will proceed upwardly stopping only at the floors at which up calls have been registered and will continue upwardly to the most remote.

floor at which a call, be it down or up, is registered, then reverse and descend, stopping only at the floors at which downccalls have been registered. It is difilcult'to describe in detail a sequence of events for such. a condition as the foregoing because of the small number of floors taken to illustrate the present embodiment of my invention. However, such a detailed description is deemed unnecessary because it will be apparent that the control system illustrated is capable of so functioning. f

Although I have not described in detail the exact sequence of events when the double throw switch 10 is thrown into a position to render the relay 87 effective to cause the elevator car to move to the upper'terminalfloor as the predetermined position to which it will always return after. the complete response of the elevator car .to the last call registered, such sequence should be readily understood from the foregoing description of the sequence in'connection-with relay 88, and the operation of relay 87 in connection with the automatic return of the elevator car to floor #1 from the basement floor.

It will thus be understood that in the early morning when the tenants of an apartment house are leaving, the double throw switch 10 may be thrown to the position for rendering relay 87 effective to cause the elevator car to re,-

' turn.v automatically to the upper terminal floor,

since the least amount oftravel of the elevator car isthereby necessary, in most instances, to bring the car to the floor at which a call is registered. During the evening hours when the tenants oi" the apartment house are returning, the double throw switch may be thrown to the position rendering relay 88' effective to auto matically return the car to floor #1 after the complete response to the last call registered, because by so doing, the car will be thereby, most readily available with the least amount of'delay to the tenants. g It will, therefore, be seen that I have disclosed a novel control system for an. elevator car whereby it is influenced or biased to one predetermined position or optionally to anyone of a plurality of predetermined positions automatically, after the car has completely responded to the last call registered.

It will also be seen that I have disclosed an elevatorcontr ol system for-operating an elevator car most elliciently and comprising means for giving a registered call preference over the bias ing control elements embodied therein so that the elevator car moves tothe floor at which a callis registered in the shortest time practicable.

It should be understoodthat the diagram of the control system accompanying this specification is intended to be illustrative of but one of many embodiments which are possible without departing from the spiritand scope of my invention. I desire, therefore, not to restrict the scope of my inventionv except as limited by the scope of the prior art and by-the appended claims. l V

- I claim as my invention;

1. In an elevator control system, motive means for moving an elevator car in a hatchway past a plurality of floors, reversing means forstarting and stopping said motive means, call-registration means operable to control said reversing means to cause said motive means to move the car to any of the floors and stop it thereat, and means responsive to a condition in which none of said call registering means is operated, forcontrolling said reversing means to causesaid motive :means to move the car to a predetermined position and stop it thereat.

2. In an elevator control system, motive means for moving an elevator car in a hatchway past a plurality of floors, reversing means for starting and. stopping said motive means, call-registration means including a relay for each floor operable to control said reversing means 'to cause said motivemeansto move the car to any of the floors and stop it thereat, andmeans responsive to a non-operated condition of all of said relays,

efiective when said call-registration meansis not effective to cause movement'of the car, for controlling said reversing means to cause it to move the car to predetermined positions correspond ing to the said additional means respectively and stop it thereat, and means for causing only one of said additional means .to be effective at one time.

4. In an elevator control .system; 'motive means for moving an elevator car in a hatchway past a plurality of floors, reversing means for starting and stopping said motive means, call-registration means including a relayfor each 'fioor'operable to control said reversing means to cause said motive means to move the car to any .of said floorsand stop it thereat, and

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