US2057492A - Signal and control system for elevators - Google Patents

Description

Oct. 13, 1936. P. C, KElPER ET AL 2,057,492

SIGNAL AND CONTROL SYSTEM FOR ELEVATORS Filed Nov. 3, 1954 5 Sheets-Sheet 1 ATT RNEY Oct. 13, 1936. P C. KElPER ET AL 2,057,492

SIGNAL AND CONTROL SYSTEM FOR ELEVATORS Filed Nov. 3., 1954 5 Sheets-Sheet 2 F7oor Buffon Sap Srl/.shes Car B.

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SIGNAL AND CONTROL SYSTEM FOR ELEVATORS.

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SIGNAL AND CONTROL SYSTEM FOR ELEVATORS Filed Nov. 3, 1934 5 Sheets-Sheet 4 F/oor Buffer/5 @3 i Cancc//af/br) 632 @raaf/hes l Car B 4127i Sufi.

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SIGNAL AND CONTROL SYSTEM FOR ELEVATORS ATT NEY Patented Oct. 13, 1935 PATENT OFFICE SIGNAL AND CONTROL SYSTEM FOR EL'EVATORS Application November 3, 1934, Serial No. 751,358

28 Claims. (Cl. 177-336) Our invention relates to signal and control systems for elevators.

In some elevator systems, it is desirable to operate the cars from terminal to terminal upon a predetermined schedule. ln other systems, it is desirable to operate the cars only when calls are to be answered. When cars are operated in the latter system, there are some periods in which the majority of the calls may be in the l0 down direction, and some periods in which the majority ci calls may be in the up direction, In these latter operations, it is desirable to have the signal and control systems so operate that the cars, if operating from a lower terminal, will, while being operated upwardly, stop at the highest registered call, regardless of whether it is an up direction or a down direction call, and if operating from an upper terminal, will stop at the lowest registered stop call, regardless of whether it is an up or a down direction call.

Therefore, one object of our invention is to provide a control and signal system by which the cars will be automatically stopped or will receive a stop signal when they reach the highest registered call regardless of the direction of the registered call or, on the other hand, will stop or receive a stop signal when they reach the lowest registered call regardless of its direction.

It is alsofan object of our invention to provide a flexible elevator system under which the cars may be operated in the most efficient manner under either a predetermined schedule or Without any schedule of operation and under either a button control system or a pre-registered signal system.

Other objects oi our invention will, in part, be obvious and will, in part, appear hereinafter.

For a clearer understanding of our invention reference may be had to the accompanying drawings, in which:

Figure 1 is a diagrammatic representation of an elevator system embodying a group of two cars to be operated in accordance with our into vention;

2 represents the arrangement of the contact segments and contact brushes on the iioor selector for one of the cars shown in Fig. 1;

- Figs. 3 and 4 collectively constitute a diagrammatic representation, in what is known as a straight line style, of the signal and control system employed in operating a group o two cars shown in Fig. l; and

Figs. 3A and 4A collectively constitute an exn planatory illustration of the relays embodied in Figs. 3 and 4.

In the illustration oi the relays in Figs. 3A and 4A, their coils and contact members are disposed in horizontal alignment. with their positions in the straight line circuits of Figs. 3 and 4, so that the reader may readily determine the identication of any relay, the number and kind of its contact members and the position of its coil and its contact members in the straight line circuits For convenience in reading the drawings, Fig. 4 should be placed under Fig. 3, Fig. 3A should be placed beside Fig. 3, and Fig. 4A should be placed under Fig. 3A and beside Fig. 4.

Also for convenience, the main relays included in the system are designated as follows:

C=C'ar buttons. CC=Car button holding coils. D=Down direction switch.

E=Decelerating inductor relay. F=Stopping inductor relay. Gzlnductor maintaining relay. Hzzlnductor restoring relay.

J :Floor buttons. IzOpposite call device or relay. Nw-Call below system relay. P=Call above system relay. Q=Restoring coils on registering relays. R--Floor button registering relays. S=Stopping relay responsive to car buttons. T=Stopping relay responsive to floor buttons. U=Up direction switch. V=High speed relay. W=Up preference relay.

X=Down preference relay. Y=Preventing relay (prevents car from answering an opposite direction call while inside call exists).

Although the control and signal system is il lustrated as provided for two cars, A and B for serving five lioors, it is to be understood that our invention may be utilized in connection With any number of cars serving any number of floors.

The relays for car B are given the same designation as those for car A with the letter B prexed thereto. The letters U and D indicate up and down direction. The preX numerals indicate the floors, and the sufiix numerals indicate the contact members of the relays. For instance, the reference letters BV indicate the high speed relay for car B, while BV3 indicates the pair of contact members of that relay disposed in the circuit leading 'to brushes B32 and B42.

The contact members EDR indicate the down call registering relay at the fifth floor, while 5DR2 indicates the contact members of that relay disposed in its self-holding circuit.

Referring more particularly to the drawings the car A is suitably suspended by a cable II, which passes over a hoisting drum I3 to a suitable counterweight I5. Referring to the control system for car A as shown in Figs. 3 and 4, the hoisting drum I3 is directly coupled to an armature I'I of a suitable hoisting motor I8, the field winding I9 of which is connected for constant voltage energization to a source of supply designated by the supply conductors L+I and L-I.

A variable voltage system of control such as the Ward Leonard system may be provided for operating the hoisting motor I8, wherein the armature II is connected in a closed circuit with the armature 2| of the generator 22. The generator is provided with a separately excited field winding 23 and a cumulative series eld winding 24. A resistor TI is connected in the circuit of the separately excited field winding for controlling the speed of the generator.

The armature 2| of the generator is operated by a suitable driving motor 25 connected to any suitable source of energy (not shown). A brake 5 operated by an electromagnet 8 is provided for applying a braking effect to the hoisting drum I3 when the car is brought to a stopy the brake magnet 6 being energized to release the brake 5 when the car is running, and being deenergized to apply the brake when the supply of power to the car is cut off.

The direction and speed of the hoisting motor I8 may be suitably controlled by controlling the direction and the value of the excitation current supplied to the separately excited field Winding 23.

The direction of excitation current for the eld winding may be suitably controlled by an up direction switch U and a down direction switch D. The value of the current supplied to the iield winding may be controlled by means of a high speed relay V for connecting and disconnecting the resistor rl. The closing of the contact members VI and the opening of the contact members V2 and V3 is retarded by a dashpot 85 to get smoother starting and to provide time for effecting cancellation of a call upon reversal of the car.

The up direction and the down direction switches are controlled by a car switch CS disposed in the car. When the car switch is moved in a clockwise direction, the down direction switch D is energized to start the car downwardly. When the car switch is moved in a counterclockwise direction, the up direction switch U is energized to start the car upwardly.

The car may be started by operating a car switch and may be stopped either by a push button control system or by response to a preregistered signal system. If the push button control system is used, the car is started by moving the car switch to start the car and is stopped by the attendant pressing a push button in the car or by waiting passengers at the floors pressing push buttons at the floors. After the car starts, the operator should return the car switch to its central position. This will have no effect on the operation of the car because the stopping is under the control of the car buttons and the iioor buttons.

When the car is operated on the preregistered signal system, it is started by moving the car switch to the right or left and is stopped by centering the car switch. A preregistered signal lamp SL is provided in the car and so connected to the stop push buttons that, when the car reaches a zone in which the car switch should center to stop the car at the floor for which a stop signal exists, the lamp SL will light. If the operator will center the switch at that time, the car will move into and stop level with the floor for which the signal was registered.

A pair of system-selecting switches 51 and 58 are provided for causing the car to operate under the preregistered signal system or under the push button control system. With switch 51 open and switch 58 disposed to engage contact member 6D shown in Fig. 3, the system is connected for operation under the push button control system and that system will be described first.

Under the control system, when the car switch operated to start the car, the up direction or the down dirction switch which is energized completes a self-holding circuit for itself which causes it to be held in until the car approaches a floor at which a stop is to be made, at which time an automatic stopping system causes the -v car to slow down and stop level with the floor. The automatic stopping system is responsive to stop buttons disposed at the floors to be operated by waiting passengers who desire to have the car stop for them, and stop buttons disposed in the car for operation by the car attendant when he wants the car to stop at a iioor to let off a passenger. In other words, a car is started by a car switch in the car, and is stopped by the waiting passengers pressing the stop buttons at the iioors or by the attendant pressing stop buttons in the car corresponding to the oors at which stops are to be made. After the car starts the car switch may be returned to its center position to await the next starting action.

Any suitable system may be employed for automatically stopping the car A level with the floors it serves. As one example of such a system we have illustrated an automatic inductor relay landing system similar to that disclosed in Patent No. 1,884,446, issued October 25, 1932, to K. N. White and G. H. Hearn, and assigned to the Westinghouse Electric Elevator Company.

The landing system for car A (Fig. l) includes a high speed decelerating inductor relay E and i a stopping inductor relay F for causing the car to be automatically decelerated from its high speed and brought to a stop at exactly level with the iioor. The inductor relay E is mounted on car A in position to cooperate with an inductor plate UE for the up direction and an inductor plate DE for the down direction. The inductor relay F cooperates with the inductor plate UF for the up direction, and an inductor plate DF for the down direction. The inductor plates are con-- structed of magnetic material and are mounted in the hatchway (not shown) in position to cooperate with and open contact members on the inductor relays when the relays are in an energized condition as the car approaches a stop at a landing.

For simplicity, only the inductor plates for one iioor have been shown, but it will be understood that a set similar to that shown may be provided for each iioor served by the car intermediate the upper terminal floor and the lower terminal floor. If desired, a set of inductor plates corresponding to UE and UF may be provided for the upper terminal, and a set corresponding to plates DE and DF may be provided for the lower terminal.

Howe-ver, in the present instance, it will be as` sumed that the car will be stopped at the terminal floors by the usual and well known limit switches (not shown).

As shown, each inductor relay is provided with two sets of contact members. For an up stop, the contact members El oi the relay E cooperate with the inductor plate UE, and the members Fl of relay F cooperate with the up inductor plate UF. For the down direction, the contact members E2 of relay E cooperate with inductor plate DE and the contact members cooperate with the inductcr plate DF.

The contact members oi the indue-tor relays just described are so connected with the car con trol circuits that, when the inductor relays energized to decelerate and stop the car at a floor in the down direction, the contact members E2 pass the inductor plate DE, and are there-- by opened to decelerate the car from high speed to stopping speed. As the Contact members come opposite the inductor plate they open to stop the car level with the floor. When the stop is to be made in the up direction, the con-- tact members El are opened by the inductor plate UE and the contact members FI are opened by the plate UF.

ie inductor relays are of the self-holding type; that is, while they are energized but have not yet come opposite an inductor plate, the contact members remain closed, but when the relay comes opposite an inductor plate, the contact members adjacent that plate move to their open position and are held in such open position until the inductor relay is deenergized. The means for holding the contact members in the open position of inductor relay EZ are the extended portions 28 and 2Q.

For instance, it will be seen that when the inductor relay E passes the down inductor plate DE while in an energized condition, the contact members E2 are opened by the arm 29a moving upwardly to a position where it is attracted and held by the magnetized projection 2.9. Therefore, the open contact members remain open and do not, after passing the inductor plate, reclose to complicate the operation oi the control system. However, we do not desire to be limited to inductor relays of this particular type, because inductor relays with temporary open contact members (well known in the art) may be used just as readily if the motor control system is adjusted to cooperate with them.

The exact position oi the inductor plates in the hatchway and of the inductor relays on the cars cannot be given here, because the position of these devices varies in each installation by reason of differences in motors, weights of cars, heights of cars, etc. However, in many commercial installations of inductor stopping systems already made, it has been found that the mechanics have no difficulty in ascertaining, while the cars are rst tried out in operation, just the precise positions in which the plates and relays should be placed.

An inductor maintaining relay G is provided for maintaining the inductor relays in an energized condition after they are energized until the stop for which they are energize-d is made.

Inasmuch as the energized inductor relays remain energized after their contact members are operated by passage near the inductor plates, an inductor restoring relay l-I (Fig. 3) is provided for deenergizing the relays after the stop is made and also for so interlocking them that they can be energized only while the car is moving.

The energization o the inductor relays on car A for decelerating and stopping that car at the various floors is eiected either by a car button stopping relay S responsive to stop buttons or switches in the car, or by a floor button stopping relay T responsive to stop buttons or switches at the various floors. The energizaticn of either the relay S or the relay T, as the car nears a floor at which a stop is to be made, energizes the inductor relays on that car and thereby causes the car to decelerate and stop at that iioor.

The stop push buttons in the car for energizing the relay S comprise one for each of the intermediate oors. The pressing of a car button by a car attendant will register a stop call, or in other words, initiate and maintain a circuit which will be completed by the arrival of the car within a predetermined distance of the floor correspending to the button and thereby deenergize the stopping relay S, which will in turn energize the inductor relays to stop the car at that floor. In this manner the car may be stopped at any intermediate floor by pressing a push button in the car for that floor. The push buttons in car A for the intermediate floor are designated as 2C, 3C and 4C corresponding to the second, third and fourth noors, respectively.

It will also be noted that a stop button IC is provided for the lower terminal and a stop button 5C is provided for the upper terminal. The buttons IC and 5C are not necessary for stopping the car at the terminals because the car will stop at such terminals by the usual limit switches. car attendant may, in accordance with our invention (as will be later described), cause the car to go to a terminal to let ori a passenger at that terminal without stopping to answer a stop call registered on a floor button for the opposite direction if he so desires.

Th car buttons IC tc 5C are provided with holding or registering coils ICC, ECC, SCC, 40C and C which operate to hold the buttons in a depressed position after they are pressed by the car attendant in controlling the stops from within the car. These coils are deenergized when the car reaches the terminals to release the buttons for the neXt direction of operation.

The means for deenergizing the registering coils ICC, etc., comprises an up preference relay W and a down preference relay X. These relays are controlled by the direction switches and interlocking contact members in such manner that when the car starts in a direction, the preference relay for that direction will be energized, and when the car starts in the other direction, the preference relay for the other direction will be energized and the previously energized relay will be deenergized. Whenever the car changes its direction, the holding coils are deenergized to restore the car buttons to their normal condition so that the car attendant may operate them for such reverse direction.

As stated previously, the loor button stopping relay T is controlled by push button switches at the oor landings, that is, the pressing of a floor button will register, or in other words, initiate and maintain a circuit which will be completed as the car nears that floor and thereby energize the stop relay T, which will, in turn, energize the inductor relays to stop the car at such floor. It should be noted that, while the car buttons are individual to each car, the floor buttons are These buttons are provided so that the soif common to both cars, that is, there is only an up button and a down button at each floor regardless of the number of cars. Hence the walting passenger has only one button to press to stop the car for him in the direction in which he desires to go.

The push buttons or switches disposed at the floors for registering stop calls (see Fig. 4) are designated as follows IUJ, 2UJ, 3UJ and 4UJ for the up direction at the first, second, third and fourth floors, and 5DJ, 4DJ, 3DJ, and 2DJ for the down direction at the fifth, fourth, third and second floors. Inasmuch as no car goes below the first oor, no down button is provided for that floor, and inasmuch as no car goes above the fth floor, no up button is provided for that floor.

Associated with the floor push buttons are stop call registering relays IUR, ZUR, 3UR, and 4UR for the up direction, and EDR, 4DR, 3DR and 2DR for the down direction. These relays operate to maintain a floor button circuit in a partially completed condition after the button is pressed until the car answers the registered call by stopping at the floor, so that the momentary pressing of a button will effect the registration of a stop call.

A cancellation coil is also mounted upon the body of each of the call registering relays for the purpose of deenergizing and restoring that relay when the call is answered. The cancellation coils are designated as IUQ, ZUQ, 3UQ and 4UQ for the up direction, and as 5DQ, 4DQ, 3DQ and 2DQ for the down direction.

The car A is provided with a call above and call below signal device for indicating to the car attendant the existence of a registered call above or below the car and that he should run the car in that direction in answer to that call. These signal devices are illustrated as a, call above panel 50 and a call below panel 5l disposed in front of corresponding electric lamps, so that the energization of a lamp will illuminate its panel. The call above lamp for car A (see Fig. 4) is designated as UL, and the call below lamp as DL.

The call above relay P and the call below relay N are provided for controlling the call above and call below lamps UL and DL in car A. The relay P is controlled by an above circuit 54 and the relay N is controlled by a below circuit 55 (Fig. 4).

The opposite direction stopping relay or opposite call response device K is provided for causing the car to stop at a floor in answer to the highest down call while the car is going up and there are no higher calls, and to stop at a floor in answer to the lowest up call while the car is going down and there are no lower calls. This relay is energized and operated by the energized portions of the circuits 54 and 55.

The preventing relay Y is provided to render the relay K ineffective and thus prevent the stopping of the car at the farthest call in the opposite direction when a stop call has been registered on a car button. A switch 56 is disposed in the car for throwing the relay Y out of operation when desired and causing the car to operate without stopping for the farthest call in the opposite direction.

In order that the various circuits for the push buttons, signal devices, control relays, etc., may be connected for operation in accordance with the movements of the cars, car A is provided with a floor selector M, and a similar selector is provided for car B. The floor selectors are similar to those usually employed in elevator signalling systems and may be located in any suitable place, such as in the penthouse.

The floor selector M for car A is provided with a set of up contact segments arranged according te the floors and disposed to be engaged by cooperating contact brushes 30, 3l, 32, 33 and 34 for the up direction, and 4U, 4|, 42, 43 and 44 for the down direction. The brushes are mounted upon an insulated movable arm MO. The movable arm MO is operated in accordance with the movements of the car A by means of a screw shaft 52 driven by some part of the operating mechanism of the car.

The frictional engagement between the arm being understood that the arm will tilt from one f position to the other when the direction of operation of the car is reversed. For a more complete description of floor selectors of this type, reference may be had to the Smalley and Reiners Patent No. 634,220, of October 3, 1899. sired, electromagnets may be employed in the well known manner to tilt the arms when the cars reverse.

The group of contact segments designated as a under the up brush 30 are energized by the pressing of the iioor buttons for the purpose of energizing the floor button stopping relay T to stop the car on its up trip when it approaches a floor at which an up stop is to be made in response to a stop signal on the floor buttons.

The group of contact segments designated as b under the brush 3l are energized when stop calls are registered on the car stop buttons for the purpose of energizing the car button stopping relay S to stop the car on its up trip when it approaches a floor at which an up stop is to be made in response to a stop signal on the car button.

The group of up contact segments designated as c under the brush 32 serves to connect the circuits for energizing the cancellation coils on the floor button registering relays to cancel the registered oor calls when the car stops in answer thereto.

The group of contact segments designated as d under the brushes 33 and 34 serve to connect the call above and call below indicators and also for stopping the car for opposite direction calls under certain conditions.

The contact segments engaged by the down brushes 40 to 44, inclusive, when the car is descending correspond to the contact segments just described for the up direction, those marked e being the floor button stopping segments, f the car button stopping segments, g the cancellation segments, and h the call above and call below segments.

The up brushes 33 and 34 and the down brushes 43 and 44 leading to the call above and call below relays should be mounted upon springs which will cause them to bear continuously upon their contact segments regardless of the direction of operation of the car. Also, the P and N relays in the call above and call below system should be so constructed that they will delay operation for a short period after they are deenergized. The period of delay should be short, usually only a fraction of a second, to permit the brushes 34 and 44 to cross the gap between the contact Segments If dewithout operating the relays P and N. This de- 75 layed operation will prevent iiickering o'f the call above and the call below lamps. The delay may be secured in any suitable manner, as by placing copper tubes in the spools upon which the coils of the relays are wound.

Inasmuch as the length of the contact segments and the size of the brushes will vary in accordance with the difference in the heights of the floors, speed of the cars, etc., it is impossible to give the exact dimensions of brushes and segments in this application. However, with the aid of the illustration given in Fig. 2, any one familiar with the elevator art should be able to arrange the contact segments and brushes on the floor selector to suit any particular installation after the desired characteristics of the system have been ascertained.

It is believed that the invention will be understood best by an assumed operation of the system diagrammatically illustrated inthe drawings.

Operation under the button control system It will be assumed that the switches t! are closed to connect the supply conductors. of the control circuit to a source of electrical energy, that car A is standing at the third floor on an up trip and that car B is standing at the fourth floor on a down trip. V7 ith the cars at these floors, the brushes will be in the positions shown in Figs. 3 and 4.

The closing of the switches E! energizes the motor field windings i9 and BSS for the motor i3 of car A and the motor Bit of car B. It will be assumed that the generators 22 and B22 are in operation and that the energized condition of the motor iield windings prepares the hoisting motors for operation.

With car A in the position indicated, its up direction preference relay W is energized, thereby closing its contact members W2 to maintain the holding coils ICC, ZCC, CC, MCC and CC to maintain the car stopping push buttons lC, etc., in car A in a depressed position if they are pressed by the car attendant to cause the car tornake a stop at a floor. The down direction preference relay BX for car B' is also energized to close its Contact members B312, thereby energizing the holding coils B'ICC, etc. for maintaining the push buttons BIC, etc. in car B in a depressed posi-A tion after they are pressed by the car attendant to cause that car to stop at a iioor.

It will be assumed now that a waiting passenger at the second floor presses the down floor button ZDJ at that floor to stop a car for a down trip. The pressing of the button ZDJ closes its Contact members and thereby energizes the stop call registering relay ZDR by a circuit extending from the supply conductor L--3, the contact members of button 2DJ, coil 2DR and conductors 52 and 63 to the supply conductor L-S. The energization of the registering relay 2DR registers a stop call for the next car to come to the second oor and indicates in both the cars that a stop signal exists at a floor below them, by closing its contact members ZDRI, 2DR2 and opening its contact members 2DR3 and EDRA.

The closing of the contact members 2DR! energizes the contact segment c2 on the floor selector for car A and the contact segment Bc2 on thefloor selector of car B to effect the stopping of the rst car to arrive. The closing of lthe contact members 2DR2 completes a self-holding circuit for the registering relay 2DR, so that it will now stay in an energized condition until its cancellation coil ZDQ is energized. The closing of contact members 2DR2 also energizes the Contact segment g2 on the floor selector of car A and a contact segment Bg on the floor selector of car B, so that the rst car to arrive and stop in answer to the call will cancel the call.

The opening of the contact members 2DR3 electrically disconnects a portion of the call above signal circuit 55's, but inasmuch as both cars are above this interruption or break, it has no effect on the above signals in the cars. The opening of the Contact members EDRA electrically interrupts or breaks the call below circuit 55, and inasmuch. as both cars are abve the second oor, no current can flow from the supply conductor L+?, through the circuit 55 to the brush il@ of car A which, by reason oi the position of car A at the third floor is now disposed on the contact segment h3. Thereiore, the below relay N is now deenergized. This condition closes its contact members NI and thereby energizes the call below lamp DL in car A by a circuit extending from the supply conductor L-l-E through the contact members NI and lamp DL to the supply conductor lll-3. The lighting of this lamp illuminates the call below panel 5| in the car A, thereby indicating to the attendant on that car that a registered stop call exists at a iioor below his car.

The opening of the contact members DBs also deenergizes the contact segment Btfi which is connected to the portion of the circuit 55 above the open contact members 2DR-4 and thereby deenergizes the brush BM and hence the below relay B'N for car B. The deenergization of the relay BN closes its contact members BNi and thereby energizes the call below signal lamp BDL in car B by a circuit extending from the supply conductor L-l-l through the contact members BNI and lamp BDL to the supply conductor L-t. The energized lamp BDI.. illuminates the call below panel B51 in car B', thereby indicating to the attendant in car B that a stop call has been registered at a floor below his car.

It will be assumed now that the attendant in car B moves vthe car switch BCS in a clockwise direction to start the car downwardly. The movement of the car switch closes its contact members @A and 55 thereby energizing the down direction switch BD by a circuit extending from the supply conductor L-l-Z (Fig. 3) through the contact members S4, 65 and BF2, the coils BD and BH and the door and gate contact members B56 to the supply conductor L-l-Z. This circuit also energizes the inductor restoring relay BH to prepare the inductor relays for operation.

The energization of the switch BD closes its contact members BDl, BDZ, BDB, BDA and BD5 and opens its contact members BDG. The closing of the contact members BD! and BDS energizes the generator field winding B23 by a circuit extending from the supply conductor L-,2 through the contact members BDS, windings B23, contact members BDi and resistor Bri to the supply conductor L+2. Energization of the generator eld winding causes the generator to operate the hoisting motor BI t to rotate the hoisting drum Bl3 for moving car B downwardly. The closing of the contact members BD2 completes a circuit for energizing the brake coil. B6 to release the brake B5 by a circuit extending from the supply conductor L--l. through the winding BIB, the coil B5 and the Contact members BDE to the supply conductor L+?.

The closing of the contact members BD6.'- energizes the high speed relay BV by a circuit extending from the supply conductor L-l-Z through the Contact members BD@ and BF2 and the coil BV to the supply conductor L-2. 'I'his relay now closes its contact members BVI and opens its contact members BV2 and BV3. The closing of the con* tact members BVI short circuits the resistor BTI thereby causing the generator and hoisting motor to operate the car at its normal high speed. The opening of the contact members BV2 prevents energization of the stopping inductor relay BF while the car is running at high speed. The opening of the contact members BV3 (Fig. 4) prevents energization of the cancellation brushes of car B to cancel a call while the car is running at high speed.

The closing of the contact members BDS completes a self-holding circuit for the down direction switch BD and this switch will now remain energized to keep the car moving until it is stopped by the operation of one of the stop buttons at the floor or operation of one of the stop buttons on the car. The opening of the contact members BDB prevents energization of the up direction preference relay BW of car B while the car is going down.

'I'he car B now moves downwardly at high speed until it approaches the second iioor at which time its oor button brush 40 moves into engagement with live contact segment BeZ for the second floor. This engagement energizes the iloor button stopping relay BT of car B by a circuit extending from` the supply conductor L-l-I (Fig. 3) through the contact segments ZDRI, conductor G'I, contact segment Be2, brush B40, the coil BT and the contact members BH3 to the supply conductor L-2.

The energization of the relay BT closes its contact members BTI, thereby energizing the inductor relay BE and the inductor maintaining relay BG by a circuit extending from the supply conductor L-l-Z through the contact members BTI, switch B58, to a junction point B68 and thence in parallel through the coils BE and BG to a junction point B69 and thence through the contact members BHI to the supply conductor L-2. The energization of the relay BG closes its contact members BGI to maintain the inductor relays in an energized condition until after the stop is completed.

As the car B approaches still closer to the second floor, the inductor relay BE passes the down inductor plate BDE and is thereby operated to open its contact members BE2, thus deenergizing the high speed relay BV to open its contact members BVI and close its Contact members BV2 and BV3. The opening of the contact members BVI reinserts the resistor BrI in the circuit of the generator eld winding B23, thereby slowing the hoisting motor and the car down to stopping speed. The closing of the contact members BV2 energizes the stopping inductor relay BF by placing it in parallel with the inductor relay BE. The closing of the contact members BV3 prepares he cancellation brushes for operation.

As the car B approaches more closely to the second floor at stopping speed, the energized inductor relay BF comes opposite the down stopping inductor plate BDF and is thereby operated to open its contact members BF2 to deenergize the down direction switch BD and the inductor restoring relay BH. The deenergization of the switch BD opens its contact members BDI and BD3 in the circuit of the field winding B23 and its contact members BDZ in the circuit of the brake coil B6, thereby stopping the motor BI8 and applying the brake B5 to hold the car while it stands at the second Hoor. The opening of the contact members BDS eliminates the holding circuit for the switch BD.

As car B is now standing at the second floor on its down trip, the cancellation brush B42 (Fig. 4) is disposed on the down contact segment Bg2, thereby energizing the cancellation coil 2DQ by a circuit extending from the supply conductor L+3 through the contact members 2DR2, coil 2DQ, conductor 10, Contact segment Bg2, brush B42, and contact members BV3 to the supply conductor L-d. The energization of the coil 2DQ deenergizes the registering coil 2DR and thereby cancels the registered down stop call at the second floor. This cancellation will be maintained while car B stands at the second floor and will thus prevent any re-registration of a down stop call at that floor during that time.

It will be assumed now that the attendant on car B opens the car and gate (not shown), takes on the Waiting down passenger, closes the door and gate, and again moves the car switch BCS in a clockwise direction. This operation will start the car downwardly as previously described, and as it comes into the lower terminal floor, the usual limit switches (not shown) will effect the stopping of the car at that terminal.

With car B at the lower terminal and car A standing at the third floor on an up trip, it will be assumed that a waiting passenger presses the down oor button 5DJ at the upper terminal or fth door, to register a down stop call at that oor. The closing of the button 5DJ energizes the registering relay EDR by a circuit extending from the supply conductor L3 through the contact members of button 5DJ and coil 5DR to the supply conductor L-S. The energize-tion of the registering relay BDR closes its contact members 5DRI and opens its Contact members 5DR2. The closing of the contact members SDRI completes a self-holding circuit for the registering relay EDR.

The opening of the contact members 5DR2 in the circuit 54 opens the circuit for the brush 353 of call-above relay P for car A (Fig. 4), thereby de energizing that relay. The deenergization of relay P closes its Contact members PI, thereby energizing the call above lamp UL in car A by a circuit extending from the supply conductor L+3 through the contact members PI, and lamp UL to the supply conductor L-3. The lighting of lamp UL illuminates the call above panel 50 in car A, thereby indicating to the attendant that a call has been registered at a floor above car A.

The opening of the contact members 5DR2 in' circuit 54 also deenergizes the contact segment Bell. Therefore, the brush B34 of car B which is now standing on that contact segment, is also deenergized, thus deenergizing the call above relay BP of car B, which in turn, closes its contact members BPI, thereby energizing the call above lamp BUL in car B by a circuit extending from the supply conductor L+4 through the contact members BPI and the lamp BUL to the supply conductor L-4. The lighted lamp BUL illuminates the call above panel B5B in car B, thereby indicating to the attendant in that car that a call exists at a floor above his car. Hence, it will be seen that the attendant in each car has been notified of the existence of a registered call at some floor above that car.

Inasmuch as car A is at the third floor on an up trip, it Will be assumed that the car attendant moves the car switch CS in a counter-clockwise direction to start the car upwardly in search ci' the call above. The car Will now run to and stop at the upper terminal. 'I'he movement of the car switch CS closes its contact members 1I and '12, thereby energizing the up direction switch U by a circuit extending from the supply conductor L+I through the contact members II and 12, and FI, coils U and H and the door and gate contact members 66 to the supply conductor L-I.

The energization of the up direction switch U closes its contact members Ui, U2, U3, U4 and U5, and opens its contact members U6. The closing of the contact members U5 completes a selfholding circuit or the up direction switch U, so that it will remain energized until the car is stopped by the operation of the inductor relays. Closing of the contact members U2 energizes the brake coil 6 by a circuit extending from the supply conductor L+I through the winding I9, coil 6 and contact members U2 to the supply conductor L- I. The energized coil B releases the brake 5 to permit the starting of the car upwardly. The closing of the contact members UI and U3 energizes the generator ield winding 23 for up direction operation by a circuit extending from the supply conductor L-I-l through the contact members UI, winding 23, and contact members U3 and resistor rI to the supply conductor LI, so that the car now starts upwardly.

The closing of the contact members U4 energizes the high speed relay V to increase the speed of the car B through a circuit extending from the supply conductor L-l-I through the contact members U4 and EI and the coil V to the supply conductor L-I. The energized relay V closes its contact members VI and opens its Contact mem bers V2 and V3. The closing of the contact members VI short circuits the resistor ri in the generator field winding circuit, and thereby causes the car to operate at its normal high spe-ed. The opening of the contact members V2 prevents energization of the stopping inductor relay and the opening of the contact members V3 prevents operation of the cancellation brushes of car A while it is running at high speed.

Car A is now moving upwardly at high speed and as it approaches the upper terminal or fifth floor, it is slowed down and stopped at that terminal by the usual limit switches (not shown). As the car comes into and stops at the landing, the cancellation brush 32 engages the contact segment c5, thereby energizing the cancellation coil 5DQ by a circuit extending from the supply conductor L-i-S, through the contact members 5DRI, coil 5DQ, contact segment o5, brush 32 and contact members V3 to the supply conductor L-3. The energized coil EDQ opposes the registering coil 5DR and thereby causes the relay 5DR to open its contact members SDRI, thereby releasing its self-holding circuit and cancelling the registered call at the upper terminal.

With the car A at the upper terminal and car B at the lower terminal, it will now be assumed that a waiting passenger at the third floor registers a down stop call by pressing the button 3DJ. This operation energizes the down registering relay 3DR for the third floor by a circuit extending from the supply conductor L|3 through the contact members of button 3DJ, the coil 3DR and conductors 62 and 63 to the supply conductor L-S. The energized relay 3DR closes its contact members SDRI and 3DR2 and opens its contact members 3DR3 and SDRA. The closing of the contact members 3DR2 completes a self-holding circuit. The closing of the contact members 3DRI (Fig. 3) energizes the down contact segment e3 of car A and down contact segment Be3 for car B for the purpose of stopping the iirst car serving that floor in the down direc tion.

rIhe opening of the contact members 3DES (Fig. 4) opens the call aboveebelow circuit 54 so that its lower portion is deenergized, thus deenergizing the contact segments dI and Boll. inasmuch as the brush 34 for car B is disposed on the contact segment Boll, the call above relay BP is deenergized and therefore closes its contact members BPI, thus energizing call above lamp BUL, The lighting of the lamp BUL illuminates the call above panel B59 in car B, thereby indicating to the attendant in that car that a registered call exists at a floor above that car.

The opening of the contact members 3DR4 interrupts the upper portion of the call below circuit 55, thereby deenergizing the contact segment h5 and the contact segment Bh. Inasmuch as the brush 44 of car A is disposed on the deenergized contact segment h5, the call-below relay N is deenergized, and thereby closes its contact members NI to energize the lamp DL by a circuit extending from the supply conductor L-l-3 through the contact members NI and lamp DL to the supply conductor L-S. The lighting oi the lamp DL illuminates the call below panel 5I in car A, thereby indicating to the at- Y tendant in that car that a stop call is registered at a oor below his car.

It will also be assumed that a waiting down passenger at the second iioor, desirous of going down, presses the down button 2DR and thereby registers a down stop call at the second floor in the same manner as previously described in connection with moving car B downwardly from the fourth floor. Inasmuch as the contact members 2DR3 are open in the call above-below circuit 56 and the contact members iiDRtI are opened in the call above-below circuit 55, no additional effect will be added to the callabove and call-below signals in cars A and B at this time.

It will be assumed now that the attendant in car B throws the car switch BCS in a counterclockwise direction to start his car upwardly. The movement of the switch cioses its contact members and lll, thereby energizing the up direction switch BU to move the car upwardly by a circuit extending from the supply conductor L-l-E through the contact members 65 and 'I4 and BFI, coils BU and BH and the contact members B66 to the supply conductor L-2.

The energization of the up direction switch BU closes its contact members BUI, BU2, BU3, BUG and BU and opens its contact members BU6. The closing of the contact members BD2 releases the brake B5, as previously described. The closing of the contact members BUI and BU3 energizes the generator field winding B23 for operating the generator and the hoisting motor BlB for the up direction. The closing of the contact members BUE provides a self-holding circuit for the switch BU. The closing of the contact members BU4 energizes the high speed relay BV to insert the resistor Bri in the circuit of the eld Winding B23 to increase the speed of the car. The energized relay BV also closes its contact members BVE and BVS to prevent energization of the inductor relay BF and to prepare for operation of the cancellation brushes, as previously described.

The energization of the relay BH closes its contact members BHI, BH2, BH3 and BH4. The closing of the Contact members BHI prepares the inductor relays for operation. The closing of the contact members BH2 and BH3 prepares the car button stopping relay BS and the floor button stopping relay BT for operation. The closing of the contact members BH4 prepares the farthest-call-in-opposite-direction relay BK for operation.

Inasznuch as the direction of car B has been reversed by energizing the up direction switch U, the opening of the contact members BUS deenergizes the down direction preference relay BX which thereupon closes its Contact members BX! and thus energizes the up direction preference relay BW by a circuit extending from the supply conductor L-l-2 through the contact meme bers BD6 and BXI and the coil BW to the supply conductor Lmii.

The deenergization of the relay BS opens its contact members BX2 and thereby deenergizes the car button holding coils BICC, B2CC, etc., to release any car button upon which a call may have been registered in car B. However, the immediate energization of the relay BW closes its contact members BWIZ and thereby reenergzes the holding coils BICC, BZCC, etc., so that, if the attendant presses a car button in car B during the up trip, the button will be maintained in its depressed position until the car reaches the other terminal or until the direction of operation of the car is reversed.

Car B is now moving upwardly with its panel B50 indicating a registered stop call at a iloor V above; that `is the registered down stop call at the third floor. But as car B passes the registered down stop call at the second floor, in appreaching the third door, its energized contact brush B44 engages the contact segment B712, and is deenergized because of the open contact mem,- bers 2DR!! cutting it off from the supply conductor L,L3, thereby deenergizing the call-below relay BN which in turn closes its contact members BNI to energize the down direction BDL in car B, as previously described, to illuminate the call-below panel BSI, thereby indicating, at this instant, that a call exists below and another call exists above car B; that is, when car is leaving the second iloor, the call above-below signals will indicate the call-above at the third iloor and the call-below at the` second floor.

It will be recalled that the contact members 3DR3 in the circuit 54 are open in that portion of the circuit 54 immediately below the conductor 15 leading `to the contact segments d3 for car A and Bd for car B, but that no contact mein bers are open in that portion of circuit 511 between the supply conductor L-l-3 and conductor 15. Therefore, the contact segments d3 for car A and Bd3 for car B remain energized or alive". As car B runs up and approaches the third floor, its farthest stop brush B33 slips oil the dead contact segments and upon the live contact segment Bd3 and thereby energizes the relay BK to eiiect the stopping of the car B at the third floor for the down call at that floor, even though car B is running in the up direction. The circuit for relay BK extends from the supply conductor L-i3 through conductor 54, the contact members 5DR2, 4UR3, 4DR3, 3UR3, conductors 15 and "I6, contact segment Bd, brush B33, contact members BYI, coil BK and the contact members BH4 to the supply conductor L-d.

The energization of the relay BK to stop the car closes its contact members BKI, and thereby energizes the inductor relay BE by a circuit extending from the supply conductor L+2 through the contact members BKH, switch B58, coil BE, and contact members BHI to the supply conductor L-Z.

As the car continues to approach upwardly toward the third floor, the energized inductor relay BE passes the up inductor plate BUE for the third floor and is thereby eenrgized to open its contact members BEI to deenergize the high speed relay BV which, in turn, opens its contact members BVI to reinsert the resistor BrI in the generator circuit thereby decelerating the car. The deenergized high speed relay BV also closes contact members BV', thereby energizing the inductor relay BF, and closes its contact members BVS to prepare the cancellation brushes for operation, as previously described.

As the car approaches still closer to the third iloor, the energized inductor relay BF passes the stopping inductor plate BUF, and is thereby operated to open its contact members BFI, thus deenergizing the up direction switch BU to stop the car level with the third floor.

The deenergization of the switch BU opens its Contact members BUI. BUR, BUS, BU!! and BU5 and closes its contact members BUG. The opening of the contact members BU?. deenergizes the brake coil B5 to apply the brake B5 to the hoisting motor. The opening of the contact members BUI and BUB opens the generator field winding B23 to stop the motor, and the opening of the contact members BUS breaks its self-holding circuit and the car now stands at the third floor.

By reason of the foregoing, it is seen that car 4UR3, ABRS, BURB, conductors 'I5 and 7E to i segment Btl-'2. brush Bibl and coil BP to con ductor L-l. The energization of relay BP extinguishes the call above lamp BUL in car B.

Inasmuch as the car B is now stopped at the third floor and is taking on a passenger for a i down trip, the car attendant will throw the car switch BCS in a clockwise direction to start the car downwardly by energizing the down direction switch BD as previously described As the car reverses its direction, the up brushes on its floor selector leave the up contact segments and the down brushes engage the down contact segments for the down trip. As the down brush 42 engages the down contact segment g3, the cancellation coil BDQ is energized to caneel the down call at the third floor by a circuit extending from the supply conductor L-i-S through the contact members 3DR2, coil 3DQ, conductor l?, contact segment Bpl-3, brush B42 and the contact members BV-fl to the supply conductor L-d, the openinrJr of the contact members BV3 being retarded by the dashpot 85. The energization of the coil @DQ will oppose the energized coil 3DR and thereby deencrgizing the registering relay 3DR to cancel ti 'egistered down call at the third floor and to close its contact members SDRS and 3DR4 in the call- above callbelow circuits 54 and 55 to elimina-te the call below signal given in car A by the registered down call at the third floor. It will also prevent the illumination of the call above-below signal in car B as that car leaves the third floor.

As the car B starts downwardly, it will pick up the registered down call at the second floor, make the stop, and then proceed tol the lower terminal floor, as described in connection with the previously registered down call at the second floor.

Hence it is seen that although car B started on an up trip, it was stopped at the floor at which the most distant call was registered in the opposite direction.

With car A at the upper landing and car B now at the lower landing, it will be assumed that a passenger enters car B and indicates a desire to get off at the fourth floor. Thereupon, the attendant in car B presses the car button BIIC to register a car call for a stop at the fourth floor. The pressing of the button closes its contact members B4C2, thereby energizing the up ccntact segment BblI to effect the stopping of car B when it arrives at the fourth floor on its next up trip. Inasmuch as the holding coil B4CC is energized, the button B4G will remain in its depressed or registered condition until the direction of operation of the car is reversed.

The opening of the contact members B4CI of the pressed button makes a break in the circuit leading to the preventing relay BY to prevent the car B from answering the uppermost call in the opposite or down direction below the fourth floor, while it is going up to the fourth oor. The energization of the relay BY opens its contact members BYI (Fig. 4) in the circuit leading to the last call stopping relay BK. Hence, the relay BK cannot be energized to effect the stopping of the car B as long as the contact members BYI are open.

It will be assumed now that a waiting passenger presses the down button 3DJ at the third floor, thereby registering a down .stop call at the third floor on the registering relay 3DR, as previously described. This registration operates the call above signal in car B and the call below signal in car A, It also deenergizes that part of the circuit 511 below the conductor 15, thus leaving the contact segment Bd3 in an energized condition from its connection with the supply conductor .L-I-3 through the upper part of circuit 54.

It will also be assumed that the attendant in car B moves the car switch BCS in a counter- `clockwise direction thereby energizing the up direction .switch BU to run car B upwardly, as previously described. As car B runs upwardly, its up brush B33 engages the energized contact segment Bd3, but the last call stopping relay BK is not energized in this .instance because the contact members BYI in its circuit have been opened by the registration on the car button B4G of the stop call for the fourth floor.

As car B continues upwardly, its brush B3I engages the energized contact segment Bfbd and thereby energizes Vthe car vbutton stopping relay BS to stop the car at the fourth iioor, by a circuit extending from the supply conductor L-I-Z through the contact members BIiCZ, contact segment B194, brush B3I, coil BSand contact members BH2 to the supply conductor L-2. The energized relay BS closes its contact members BSI, thereby energizing the inductor relay BE by a circuit extending from the supply conductor 'L-I-Z through the contact members BSI, switch B58, coil BE and contact members BHI to the supply conductor L-Z. As the car B approaches the fourth floor, the energized inductor'relay BE passes the up inductor plateBUE .and is .thereby operated to open its contact members BEI, thus deenergizing the high speed relay BV. The deenergized high speed relay BV decelerates the car :and effectsthe energization of the stopping inductor relay BF, as previously described.

AsA the car B approaches still more closely to `within stopping distance of the fourth floor, the energized inductor relay BF passes the inductor plate UF and is thereby operated to open its contact members BFI, thus deenergizing the up direction switch BU andefecting the stopping of .the car, `as previously described, at the fourth floor.

Fromfthe above, it will be seen that the registration of a ystop call upon a car button for a floor beyond the farthest call in the opposite direction ,will result in the car passing the registered call inthe opposite direction Without stopping.

Itwillfalso be seen that if the switch 56 leading to the preventing relay Y and the switch B56 leading to the preventing relay BY are opened and left in that condition, the cars may be operated without responding to the farthest call in the opposite direction. Th-at is, they may be operated in the regular manner with the call above and call below signals working but without vstopping for any call in the opposite direction.

Operation under the preregistered signal system The system will be changed now to operate under the preregistered signal system instead of under the `button control system. This change is effected by closing the switch 51 to connect the contact member 82 of the lcar switch vCS directly to the inductor relay-s so that if the car switch is 'd ;tancefrom a floor, the inductor relays will be energized to automatically decelerate the car and stop accurately level with that floor in the same manner as when operating under push button control. The switch 58 is also moved from the contact member 60 to contact member 59, thereby disconnecting the contact members KI, SI and TI from the circuit of the inductor relays and connecting them to the circuit of the preregistered signal lamp SL in car A. Also, switch B58 is thrown from the contact member B60 to the contact member B59 and the switch B51 is closed to change the ycircuits for car B in the same manner as they have been changed for car A so that car I B will operate under the lighting of the preregistered signal lamp BSL in that car instead of under the-push button control.

It will now be assumed that car B is returned vto the lower terminal and that a waiting passenger at the fourth floor registers an up call by pressing the button IiUJ at the fourth floor to light the stop signal lamp in the first car for the up direction. The pressing of the button energizes the registering relay dUR by a circuit ex- V.tending from supply conductor L-I-3 through the contact members of button 4UJ, the coil IIUR and V'the conductors 62 and 63 to the supply conductor The energization of the registering relay 4UR closes its contact members 4URI and 4UR2 and opens i Aits contact 4members 4UR3 and IIURII. The closing of the contact members IIUR2 establishes a self-holding circuit for the relay. The closing ofthe contact members 4URI energizes the contact segment a3 on the floor selector of car A and the contact segment Ba3 on the oor selector of car B so that the nrst car to arrive at the fourth floor in the up direction will have its preregistered signal operated to indicate a stop at the fourth floor.

The opening of the contact members 4UR3 in the call above circuit 54 cuts off the lower portion of that circuit from being energized by the supply conductor L+3 thereby deenergizing the contact segments dI and BdI. Inasmuch as car B is standing at the lower terminal and its brush B34 is disposed on the deenergized contact segment Bhl, the "call above relay BP is deenergized and thereby closes its contact members BPI to energize the call above lamp BUL ln car B. The lighting of the lamp BUL illuminates the call above panel B in car B, thereby indicating to the attendant in that car the existence of a call at a floor above the car. The opening of the contact members 4UR4 in the call below circuit deenergizes the upper portion of that circuit, thus deenergizing the contact segment h5 upon which the brush 44 of car A is disposed. This deenergizes the relay N to close its contact members NI, thus energizing the call below lamp DL. The lighting of the lamp DL illuminates the call below panel 5I in car A, thereby indicating to the car attendant in that car the existence of a registered call at a floor below that car.

It will also be assumed that a waiting passenger at the third floor, desirous of making a down trip, presses the down button 3DJ, thereby registering a down stop call at the second oor, as previously described in connection with the control system. 'I'he registration of the down stop call at the third iioor energizes the down contact segment e3 on the floor selector of car A and the down contact segment Be3 on the floor selector of car B for the purpose of giving a stop signal to the first car serving that floor in the down direction.

It will be assumed now that the attendant in car B throws the car switch BCS in a. counterclockwise direction and starts car B on an up trip, as previously described. As car B moves upwardly, it passes the down stop call registered at the third floor. Although that call is registered for the opposite direction, it is not the farthest call in the direction car B is going because of the existence of the up registered call at the fourth floor. As stated above, the up registered call at the fourth iloor has opened the contact members 4UR3 in the circuit 54 and the contact members 4UR4 in the circuit 55. Therefore, although the brush B33 of car B engages the contact segment Bd3 connected with circuit 54 as the car goes up, the farthest call stopping relay BK will not be energized because of the open contact members 4UR3 above the point at which the conductor 15 from the contact members Bd3 is connected to the conductor 54. Hence, car B will not receive a stop signal at this call in the opposite direction but will continue moving toward the fourth floor.

As car B approaches the fourth floor, its brush B30 engages the energized contact segment Ba4, thereby energizing the floor button stopping relay BT to give a stop signal, by a circuit extending from the supply conductor L+I through the contact members 4URI, contact segment Ba4, brush B3B, coil BT and the contact members BH3 to the supply conductor L-2. The energization of the `relay BT closes its contact members BTI thereby contact members B59, lamp BSL and the contact members BHI to the supply conductor L-2.

The lighting of the signal lamp BSL in car B gives the preregistered signal to the car attendant, thereby indicating to him that he should immediately center the car switch BCS to stop the car at the next floor. The attendant immediately centers the car switch and thereby energizes the inductor relay BE and the inductor maintaining relay BG by a circuit extending from the supply conductor L-l-2 through the Contact members 65 and 8D of switch BCS, the now closed switch B51 and thence in parallel through the coils BE and BG to the junction point B69 and through the contact members BHI to the supply conductor L-2.

As car B approaches still closer to the fourth floor, the energized inductor relay BE passes the up inductor plate BUE, and is thereby energized to open its Contact members BEI thus deenergizing the high speed relay BV to open its Contact members BVI and close its contact members BV2 and BV3 to effect deceleration of the car, the energizing of the stopping inductor relay BF and the preparation of the concellation brushes, as previ- I ously described.

As the car approaches to within stopping distance of the fourth floor, the energized inductor relay BF comes opposite the up inductor plate BUF and is thereby operated to open its contact members BFI, which deenergizes the up direction switch BU and stops the car level with the fourth floor in the same manner as previously described in connection with the other floors.

It will be assumed now that a waiting passenger at the second floor, desirous of going up, presses the up button 2UJ and thereby registers an up stop call at the second floor, The pressing of the button energizes the registering relay ZUR by a circuit extending from the supply conductor L+3 through the contact members of button 2UJ, the coil ZUR and conductors 62 and 63 to the supply conductor L-3. The energized relay ZUR closes its contact members 2URI and 2UR2 and opens its contact members 2UR3 and 2UR4. The closing of the contact members 2UR2 provides a self-holding circuit for the relay. The closing of the contact members ZURI energizes the contact segment a2 on the floor selector of car A and the contact segment Ba2 on the floor selector of car B for the purpose of giving a stop signal to the first car approaching in the up direction.

The opening of the contact members 2UR3 in call above circuit 54 and the contact members 2UR4 in circuit 55 do not affect the call above signals in either car as both cars are above the second floor.

It will be assumed now that the attendant in car A moves the car switch CS in a clockwise direction, thereby energizing the down direction switch to run car A downwardly in the same manner as has been described in connection with car B.

As car A approaches the third floor in the down direction, its Contact brush 40 engages the contact segment e3 (energized by the registered down stop at the third floor) and will thereby energize the floor button stopping relay T by a circuit extending from the supply conductor L-i-I through the contact members 3DRI, contact segment e3, brush 40, coil T, and contact members H3 to the supply conductor L- I.

The energized relay T closes its Contact members TI thereby lighting the preregistered signal lamp SL by a circuit Vextending from the supply conductor L-f-I through the contact members Tl, switch 58 (now closed to contact member 59) the lamp SL and contact members Hl to supply conductor L-L The lighting of the lamp SL indicates to the attendant in car A that he should at once throw his car switch CS to its central position. Assuming that he does this, he thereby energizes the inductor stopping relay E and the inductor maintaining relay G by a circuit extending from the supply conductor L-i-l through the contact members 1I and 82 of switch CS, the now closed switch 51, in parallel through the coils E and G and then through the contact members Hl to the supply conductor L-L As the car approaches more closely to the third oor, the energized inductor relay system stops level with the floor in the same manner as described in the operation of car B. It will be assumed that the attendant in car A opens the car gate and door (not shown) and takes on the waiting passenger, and starts the car to continue its down trip. As car A proceeds downwardly, it approaches the second floor at which is registered the up stop call. Inasmuch as this is the lowest call for car A going downwardly even though the call is in the opposite direction, it will effect the lgiving of the preregistered stopping signal to the attendant in car A sov that he can stop the car at that oor.

As car A approaches within signalling distance of the second floor, its brush 43 engages the contact segment h2 and thereby energizes the last call stopping relay K by a Vcircuit extending from the supply conductor L-|-3 through conductor 83, contact members IURZ and 2DR4, conductor 84, contact segment h2, brush 43, contact members YI, co il K and contact members H4 to the supply conductor L-3. The energization'of therelay K closes its contact members Kl (Fig. 3) thereby energizing the preregistered signal lamp SL by a' circuit extending from the supply conductor L-l-l through the contact members KI, switch 58, (now on contact member 59), lamp SL and the contact members HI to the supply conductor Lwl. The lighting of the lamp SL indicates to the attendant in car A that he should immediately center the car switch CS to stop the car at the next iloor. It will be assumed now that the car attendant centers the car switch and stops the car at the second floor, as previously described in stopping this car at the third floor.

Inasmuch as car A has now no calls below the second floor and the passengerv for whom he stopped at the second iloor desires to make an Aup trip, the attendant on car A will now start that car up-wardly by moving the car switch CS in a counter-clockwise direction, thereby energizing the up direction switch U and moving the car upwardly, as previously described.

The change in direction of operation of the car will cause the down brushes on the floor selector of car A to be lifted from the down contact segments and the up brushes to engage the up contact segments. Hence the up cancelling brush 32 will now engage the up contact segment c2 and thereby energize the cancellation coil 2UQ by a circuit extending from the supply conductor L+3 through the contact members 2UR2, coil ZUQ, contact segment c2, brush 32, and contact members V3 to the supply conductor L-3. The energization of the cancellation coil ZUQ opposes the energized coil ZUR and thereby restores the registering relay 2UR to itsinactive position, thus cancelling the up call at' the second floor yand restoring :the call above and call below signals into the cars now that car A has answered the lowest call in the opposite direction.

By reason of the foregoing description, it will be seen that we have provided a flexible elevator '5 system which may be operated under either a push button control system or a preregistered signal system to answer, in the most effective manner, the stop calls. of the passengers regardless of the direction of the calls and the direction of movement of the cars so that all the cars may operate at the points in the system where they may render the most eilicient service.

Although we have illustrated and described only two applications of our invention, it is to be understood that many changes and modications may be made therein without departing from the spirit and scope of the invention.

We claim as our invention:

1. In an elevator system for operating a car serving a lpluralityof floors, an up call registering device anda down call registering device for each floor, a signal device inthe car, means responsive to the operation of a call registering device for operating the signalv device in the car to indicate whether the call is at a oor above or below the car, means for starting the car, a stopping means for the car, means responsive to the approach of the car to a registered call in the corresponding direction for stopping the car at that iioor, and means responsive to the approach of the car to a registered call in the opposite direction for stopping the car at that floor provided no more distant call exists in the direction of operation of the car.

2. In an elevator system for operating .a plurality of cars serving a plurality of floors, an up call registering device and a down call registering device for each floor, a signal device in each car, means responsive to the registration of'one or'i more calls for operating the signal device in each car to 'indicate the direction of the floors of the registered calls from that car, starting means for the cars, a stopping means for each car, and means responsive to the position of the lrst car to approach the most distant registered call regardless of the direction of that registered call for operating the stopping means of that car to stop it at the oor of that registered call. v A

3. In an elevator system for operating a car'f5'0 serving a plurality of oors, an up call registering device and a down call registering device ior each floor, an energized above circuit and an energized below circuit, means responsive to regisn tration of an up call and/or down call for deen- `r ergizing that portion of the above circuit corresponding to the floors below the registered call and for deenergizing that portion of the below circuit corresponding to the floors above the car,

a signal device on the car, means responsive to the 'T130 deenergized portions of the above and below circuits for operating the signal device in the car to indicate whether the registered call is at a iioor above or below the car, means for starting the car,

a stopping means for the car, means responsive to the approach of the car to the registered call in the corresponding direction for operating the stopping means to stop the car, and means responsive to the energized portions of the above v and below circuits for operating the stopping'to means tostop the car at the most distant registered call for the opposite direction when no farther call is registered in the direction the car is running.

`rality of cars serving a plurality of floors, an up call registering device and a down call registering device for each floor, an energized above circuit and an energized below circuit, means responsive to the registration of one or more calls for deenergizing that portion of the above circuit corresponding to the floors below the registered call or calls and for deenergizing that portion of the "below circuit corresponding to the oors above the registered call or calls, a signal device in each car, means responsive to the deenergized portions of the said circuits for operating the signal device to indicate the direction of the floor of the registered call from each of the cars, means for starting the cars, individual stopping means for the cars, means responsive to the registered calls for operating the stopping means of the first car to approach in the corresponding direction, and means responsive to the energized portions of the said circuits for stopping the first car to approach a registered call in the opposite direction when it is the farthest registered call in the direction of operation of that car.

5. In an elevator system for operating a car serving a plurality of floors, an up call registering switch and a down call registering switch at each floor, a stop call registering device in the car, an energized above circuit and an energized below circuit, means responsive to the registration of a call on a switch for deenergizing that portion of the "above circuit corresponding to the oors below the registered call and for deenergizing that portion of the below circuit corresponding to the floors above the registered call, a signal device in the car, means responsive to the deenergized portions of said circuits for operating the signal device to indicate the direction of the floor of the registered call relative to the car, means for starting the car, a stopping means for the car, an opposite call device, means responsive to the energized portions of the said circuits for energizing the opposite call device to operate the stopping means to stop the car at the floor of the registered call as it approaches said registered call in a direction opposite to the direction of that registered call when no more distant call exists in the direction of operation of the car and means responsive to the registration of a call on the registering device in the car for preventing operation of the opposite call device.

6. In an elevator system for operating a car serving a plurality of floors, means for starting the car, a stopping means for the car, an up control device and a down control device for each floor, an energized above circuit and an energized "below circuit, means responsive to operation of a control device for deenergizing that portion of the above circuit corresponding to the floors below the floor of the operated control device and for deenergizing that portion of the below circuit corresponding to the floors above the floor of the operated control device, an opposite call device responsive to connection with the energized portion of the above circuit as the car travels upwardly for operating the stopping means to stop the car at the next floor and responsive when traveling downwardly to connection with the energized portion of the be1ow" circuit for operating the stopping means to stop the car at the next oor.

7. In an elevator system for operating a plurality of cars serving a plurality of floors, means for starting the cars, a stopping means for each car, an up control device and a down control device at each floor common to all the cars, an

energized above circuit and an energized below circuit common to all the cars, means responsive to the operation of a control device at a floor for deenergizing that portion of the aboi/e" circuit corresponding to the iloors below the floor of the operated control device and for deenergizing that portion of the below circuit corresponding to the floors above the oor of the operated control device, an opposite call device for each car for operating the stopping device of that car, and means responsive to the approach oi the first car to the energized portion of that circuit corresponding to the direction of that car for connecting the opposite call device of that car to that energized circuit whereby the stopping oi that car will be effected at the next floor in the direction of operation of that car.

8. In an elevator system for operating a car serving a plurality of oors, means for starting the car, a stopping means for the car, an up control device and a down control device and a down control device at each floor, means responsive to operation of the control device and to the approach of the car in the corresponding direction for stopping the car at the floor of the operated control device, an energized above circuit and an energized below circuit, means responsive to operation of the control devices to register stop calls for deenergizing that portion of the above circuit corresponding to the floors below, the operated control device and for deenergizing that portion of the below circuit corresponding to the floors above the operated control device, an opposite call device responsive to the energized portion of the above circuit when the car makes an up trip and to the energized portion of the below circuit when the car makes a down trip for operating the stopping means of the car when it arrives at the iioor of an operated control dcvice for the opposite direction and no operated control device exists beyond that oor in the direction of travel of the car.

9. In an elevator system for operating a car serving a plurality of iioors, means for starting the car, a stopping means for the car, an up ccntrol device and a down control device at each floor, means responsive to operation of the control device and to the approach of the car in the corresponding direction for stopping the car at the oor of the operated control device, an energized above circuit and an energized below circuit, means responsive to operation of the control devices to register stop calls for deenergizing that portion of the above circuit corresponding to the floors below, the operated control device and for deenergizing that portion of the below circuit corresponding to the floors above the operated control device, an opposite call device responsive to the energized portion of the above circuit when the car makes an up trip and to the energized portion of the below circuit when the car makes a down trip for operating the stopping means of the car when it arrives at the floor of an operated control device for the opposite direction and no operated control device exists beyond that floor in the direction of travel of the car, and means responsive to the manual operation of the car attendant for rendering said opposite call device ineffective when the attendant does not desire to make a stop for the farthest call in the opposite direction.

l0. In an elevator system for operating a car serving a plurality of floors, means for starting the car, a stopping means for the car, an up conmtrol device and a down control device at each device for operating the stopping means when the car approaches in the corresponding direction, an energized above circuit and an energized below circuit, means responsive to operation of. a control device for deenergizing that portion of the above circuit corresponding to the oors below the operated control device, and for deenergizing that portion of the below circuit corresponding to the floors above the operated control device, an opposite call device responsive to the above and below circuits and to the approach of. the carto the floor of the most distant operated control device when it is for the opposite direction for stopping the car at that floor, control devices disposed in the car for registering stop calls to be made at the floors, and means responsive to the registration of a stop call on a control device in the car for rendering ineiective the opposite call device` l1. In an elevator system for operating a car serving a plurality of floors, means for starting the car, means for stopping the car, an up control device and a down control device at each floor,"

f means responsive to operation of a control device for operating the stopping means when the car approaches in the direction of the operated control device, an energized above circuit and an energized below circuit, means responsive to o-peration of a control device for deenergizing that portion of the above circuit corresponding to the iioors below the operated control device and for deenergizing that portion of the below circuit corresponding to the iioors above the operated control device, an opposite call device responsive to the energized portions of the above and below circuits for operating the stopping means of the car as it approaches the floor of the most distant operated control device for the opposite direction, and means responsive to reversal of the car after making the opposite direction stop for restoring the operated opposite direction control device to normal condition.

12, In an elevator system for operating a car serving a plurality of floors, means for starting the car, an up control device and a down control device at each floor, a call response device responsive to operation of a control device and to the approach of the car in the corresponding direction for operating a means associated with the stopping of the car, an energized above circuit and an energized below circuit, means responsive to operation of a control device for deenergizing that portion of the above circuit corresponding to the floors below the operated control device and for deenergizing that portion of the below circuit corresponding to the oors above the operated control device, and an opposite call response device responsive to the energized portion of the "above circuit when the car moves upwardly for operating a means associated with the stopping of the car as the car arrives at the highest operated down control device while no farther up control device is operated and responsive to the energized portion of the below circuit while the car is travelling downwardly for operating a means associated with the stopping of the car as the car arrives at the lowest operated up control device while no farther down control device is operated.

13. In an elevator system for operating a car serving a plurality of floors, means for starting the car, an up control device and a down control device for each iioor, an energized above cir-v cuit and an energized below circuit, meansresponsive to energization of a control device iory deenergizingthat portion of the above circuit corresponding to the floors below the floor oi the operated control device and for deenergizing that portion of the below circuit corresponding to the floors above the oor of the operated control device, a pre-registered signal device and a stopping device, an opposite call response device for operating either the pre-registered signal device or the stopping device, means for selectively connecting the pre-registered signal device or the stopping device to the opposite call response device, and means responsive to upward travel of the car for connecting the opposite call response device* to the energized portion of the above circuit and to downward travel of the car to connect the opposite call response device to the energized portion of the below circuit for operating the call responding device.

14. In an elevator system for operating a car serving a plurality of oors, means for starting the car, an up control device and a down control device at each iioor, a call responsive device responsive to operation of a control device and to the approach of the car in the corresponding direction for operating some means functionally related to the stopping of the car, an energized above circuit and an energized below circuit, means responsive to operation of a control device for deenergizing that portion of the above circuit corresponding to the floors below the operated control device and for deenergizing that portion of the below circuit corresponding to the floors above the operated control device, an opposite call response device responsive to the energized'portion of the above circuit when the car moves upwardly for operating some meansi functionally related tothe stopping of the car as the car varrives at the highest operated down control device while no farther up control device is operated and responsive to the energized portion of the below circuit while the car is traveling downwardly for operating some means functionally related to the stopping of the car as it arrives at the lowest operated up 'control device and no vfarther down control device is operated, and means responsive to reversal of the car upon answering an opposite direction operated control device. for restoring that operated control device to its normal condition.

' 15. In an elevator system for operating a plurality of cars serving a plurality of oors, an up call registering device and a down call registering device for each floor, a call above-below signal device in each car, means responsive to the operation of a` call registering device for operating the call above-below signal device in each car to indicate whether the call is above or below that car, means for starting the cars, a call responsive means for each car responsive to the approach of that car to a registered call in a corresponding direction for operating some device functionally related to the stopping of that car at that oor, and an opposite call responsive device for each car responsive to the approach of that car to a registered call in the opposite direction for operating some device functionally related to theA stopping of that car at the iioor of that'I call 'provided no more distant call exists in the direction of operation of that car.

'16. In an velevator system for operating a car serving a plurality of floors, an up call registering device and a down call registering device for each oor, a call above-below signal device in the car, means responsive to the operation of a call registering device for operating the call above-below signal device in the car to indicate whether the call is above or below the car, means for starting the car, a call response means responsive to the approach of the car to a registered call in a corresponding direction for operating some device associated with the car for stopping the car at that oor, and an opposite call response device responsive tol the approach of the car to a registered call in the` opposite direction for operating some device associated with the stopping of the car at the floor of that call provided no more distant call exists in the direction of operation of the car.

17. In an elevator system for operating a plurality of cars serving a plurality of floors, an up call registering device and a down call registering device for each floor, a call above-below signal device in the car, means responsive to the operation of a call registering device for 'operating the call "above-below signal device in the car to indicate whether the car is at the floor above or below the car, means for starting the car, a stopping means for the car, a pre-registered signal device on the car for indicating when the attendant should operate the stopping means to stop the car in answer to an operated control device, means responsive to the approach of the car to a registered call in the corresponding direction for operating the pre-registered signal device, and means responsive to the approach of the car to a registered call in the opposite direction for operating the pre-registered signal device provided no more distant call exists in the direction of operation of the car.

18. In an elevator system for operating a car serving a plurality of Iioors, an up call registering switch and a down call registering switch at each floor, an energized above circuit and an energized below circuit, means responsive to the registration of a call on a switch for deenergizing that portion of the above circuit corresponding to the oors below the registered call and for deenergizing that portion of the below circuit corresponding to the floors above the registered call, a call above-below signal device in the car, means responsive to the deenergized portions of said circuits for operating the call above-below signal device to indicate the direction of the floor of the registered call relative to the car, means for starting the car, a stopping means for the car, an opposite call response device, means responsive to the energized portions of the said circuits for energizing the opposite call response device as the car approaches said registered call in a direction opposite to the direction to that registered call when no more distant call exists in the direction of operation of the car, a pre-registered signal device in the car, and means responsive to operation of the opposite call responding device for operating the pre-registered signal device to indicate to the car attendant to operate the car stopping means.

19. In an elevator system for operating a car serving a plurality of floors, means for starting the car, a stopping means for the car, a preregistered signal device in the car for indicating when the attendant should operate the stopping means to stop the car in answer to an operated control device, an up control device and a down control device at each floor, means responsive to operation of a control device and to the approach of the car in the corresponding direction for stopping the car at the floor of the operated control device, an energized "above circuit and an energized below circuit, means responsive to operation of a control device for deenergizing that portion of the above circuit corresponding to the floors below the operated control device and for deenergizing that portion of the below circuit corresponding to the floors above the operated control device, and opposite direction control means responsive to the energized portion of the above circuit when the car moves upwardly for operating the signal device as the car arrives at the highest operated down control device while no farther up control device is operated and responsive to the energized portion of the below circuit while the car is traveling downwardly for operating the signal device as the car arrives at the lowest operated up control device and no farther down control device is operated.

20. In an elevator system for operating a car serving a plurality of floors, means for starting the car, a stopping means for the car, a signal device in the car for indicating when the attendant should operate the stopping means to stop the car in answer to an operated control device, an up control device and a down control device at each floor, means responsive to operation of a control device and to the approach of the carin the corresponding direction for stopping the car at the iloor of the operated control device, an energized above circuit and an energized below circuit, means responsive to operation of a control device for deenergizing that portion of the above circuit corresponding to the oors below the operated control device and for deenergizing that portion of the below circuit corresponding to the floors above the operated control device and opposite direction control means responsive to the energized portion of the above circuit when the car moves upwardly for operating the signal device as the car arrives at the highest operated down control device while no farther up control device is operated and responsive to the energized portion of the below circuit while the car is traveling downwardly for operating the signal device as the car arrives at the lowest operated up control device and no farther down control device is operated, and means responsive to reversal of the car upon answering an opposite direction operated control device for restoring that operated control device to its normal condition.

2l. In an elevator system for operating a plurality of cars serving a plurality of floors, means for starting each car, an up control device and a down control device at each oor, a call responsive device for each car and responsive to operation of a control device and to the approach of that car to the floor of the operated control device in the corresponding' direction for operating some means functionally related to the stopping of the car, an energized above circuit and an energized below circuit common to all the cars, means responsive to operation of a control device for deenergizing that portion of the above circuit corresponding to the floors below the operated control device and for deenergizing that portion of the below circuit -corresponding to the floors above the operated control device, an opposite call response device for each car responsive to the energized portion of the above circuit when that car moves upwardly for operating some means functionally related to the stopping of the car as the car arrives at the highest operated down control device while no farther up control device is operi ated and responsive to the energized portion of the below circuit while that car is travelling downwardly for operating some means functionally related to the stopping of the car as it arrives at the lowest operated up control device and no farther down control device is operated, and means responsive to reversal of a car upon answering an opposite direction operated control device for restoring that operated control device to its normal condition.

22. In an elevator system for operating a plurality of cars serving a plurality of floors, an up call registering device and a down call registering device for each oor, means for starting the cars, a stopping means for each car, and means responsive to the position of the first car to approach the most distant registered call regardless of the direction of that registered call for operating the stopping means of that car to stop it at the floor of that registered call.

23. In an elevator system for operating a plurality of cars serving a plurality of floors, an up call registering device and a down call registering device for each floor, an energized above circuit and an energized below circuit, means responsive to the registration of one or more calls for deenergizing that portion of the above circuit corresponding to the floors below the registered call or calls and for deenergizing that portion of the below circuit corresponding to the floors above the registered call or calls, means for starting the cars, individual stopping means for the cars, means responsive to the registered calls for operating the stopping means of the rst car to approach in the corresponding direction, and means responsive to the energized portions of the said circuits for stopping the rst car to approach a registered call in the opposite direction when it is the farthest registered call in the direction of operation of that car.

24. In a control system for a plurality of elevator cars servingva plurality of floors, means for starting the cars, an up control device and a down control device at each of said oors, means individual to each car and responsive to the operation of either control device at one of the floors to stop the associated car at said floor, means for causing the operation of the stopping means for but one of the cars approaching the Floor, said means effective to stop said car regardless of its direction of travel provided no other control device is operated at any oor beyond said floor in the direction of travel of said car, and means for preventing the operation of the stopping means for the other cars in response to said operated control device until after the first-named car has stopped at the oor.

25. In a control system for a plurality of elevator cars serving a plurality of floors, means for starting the cars, an up control device and a down control device at each of said oors, means responsive to the operation of an up control device at one of the floors to stop one of said cars depending on the relative positions of said cars, said means effective to stop said car regardless of its direction of travel provided no other control device is operated at any floor beyond said floor in the direction of travel of said car, and means for preventing the stopping of the other cars at said floor in response to the operation of said up control device until after the first-named car has stopped at said floor.

26. In an elevator system for operating a plurality of cars serving a plurality of floors, an up call registering device and a down call registering device for each floor, a control device in each car for starting that car, a stopping means for each car, and means responsive to the position of the first car toapproach the most distant registered call regardless of the direction of that registered call for operating the stopping means of that car to stop it at the iioor of that registered call.

27. In an elevator system for operating a plurality of cars serving a plurality of floors, an up call registering device and a down call registering device for each iloor, an energized above circuit and an energized below circuit, means responsive to the registration of one or more calls for deenergizing that portion of the above circuit corresponding to the floors below the registered call or calls, and for deenergizing that portion of the below circuit corresponding to the floors above the registered call or calls, a control device in each car for starting that car, individual stopping means for the cars, means responsive to the registered calls for operating the stopping means of the first car to approach in the corresponding direction, and means responsive to the energized portion of the said circuits for stopping the first car to approach a registered call in the opposite direction when it is the farthest registered call in the direction of operation of that car.

28, In an elevator system for operating a plurality of cars serving a plurality of floors, a control device disposed in each car for starting that car, a stopping means for each car, an up control device and a down control device at each floor common to the cars, an energized above circuit and an energized below circuit common to all the cars, means responsive to the operation of a control device at a floor for deenergizing that portion of the above circuit corresponding to the floors below the floor of the operated control device, and for deenergizing that portion of the below circuit corresponding to the floors above the floor of the operated control device, an opposite call device for each car for operating the stopping device of that car, and means responsive to the approach of the rst car to the energized portion of that circuit corresponding to the direction of that car for connecting the opposite call device of that car to that energized circuit whereby the stopping of that car will be effected at the next floor in the direction of operation of that car.

PHILLIP C. KEIPER. EDGAR M. BOUTON,

Administrator of the Estate of Frank E. Lewis,

Deceased.

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