DEO0001820MA - - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

Registration date: September 15, 1951. Advertised on December 20, 1956

GERMAN PATENT OFFICE

The invention relates to control systems for a plurality of elevators, and is particular aimed at the formation of a so-called lift chair collective control. With these Control systems are provided in the elevators and floors operated by the buttons traveling or waiting passengers for the purpose of issuing an operating command and its Storage are actuated. With simplex group controls, where only a single elevator is controlled, saving one sets Elevator or a landing call the elevator in motion, which starts after starting stops on all floors with stored calls and automatically starts again after this stop, until all calls have been answered and the operating commands have been fulfilled. With multiplex group controls, where two or more elevators are controlled, each elevator is under the command his own elevator buttons and the command of the floor buttons common to all elevators. Each elevator is set in motion by storing its own elevator call while answering of a stored landing call, usually only one elevator is put into operation. There are

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Also various bodies have already been proposed in order to support a to put another elevator into operation if the elevator is already in operation. For example kaiin a stand-by elevator to be set in motion if one is behind one or more elevators already in operation stored floor call will. One such control system is described in U.S. Patent 2,100,176.

The invention relates to multiplex group controls, in particular to an elevator group control with several elevators under the joint influence of the landing call storage means, of which at least in each case one of the first, stored floor call is started and is identified by electrical controls, e.g. B. Waiting relay, which only after a specified period, in the further Floor calls not answered by the first started elevator or the already started elevators are, the starting of an additional elevator to support answering calls by acting on its starting means, e.g. B. Start-up switch, trigger.

With Sämmel controls it is advantageous to use up to a certain part of its capacity to automatically prevent a loaded elevator from stopping on landing calls, This operating mode is usually referred to as automatic load passage. If now that Elevator system of the type mentioned is equipped with automatic load passage, then can also automatically close another elevator when an elevator is loaded with loads his support.

For ease of understanding, reference should now be made to the drawings, in which an embodiment of the invention has been illustrated. It shows

Fig. Ι a simplified schematic representation of a according to the invention designed double elevator 'device,

Fig. 2a and 3a taken together, the simplified circuit diagram of the power and control circuits for one of the elevators according to FIG. 1, with certain Circles belong to both elevators,

FIG. 2 b a simplified circuit diagram of the control circuits of the other elevator according to FIG. 1 corresponding to those of Fig. 2 a,

Fig. 4S ₁ , 4S ₀ , 4S ₃ and 4S ₄ key blades for Fig. 2 a, 2 b and 3 a, the electromagnetic switches are shown in spindle form and Fig. 4S _{1 is} limited to the floor relays,

Fig. 5 a and 6 a, 5 b and 6 b and Sc and 6 c simplified Circuit diagrams of parts of control circuits, which when using the invention for more two elevators can be used,

FIg ^ s ₁ , 7S ₂ , 7S ₃ , 7S ₄ , 7S ₅ and 7 S ₆ key blades for Figs. 5 a, 6 a, 5 b, 6 b, 5 c and 6 c, again with FIg ^ s ₁ on the Stoekwerk relay is limited.

The key blades shown in FIGS. 4 s and 7 s are intended to be used in the extensive circuit diagram of FIGS. 2 a, 2 b, 3 a, 5a, 5b, 6a, 6b and 6c to find a certain switching element faster, to make the circuit easier to understand, etc. On its long, vertical lines or "spindles" z. B. for each relay, the windings and contacts are drawn in the altitude in which they are based on the actual circuit diagram of FIGS. 2 a, 2 b, 3 a, 15 a, 5 b, 5 c, 6 a, 6 b or 6 c appear when the circuit diagram and key blade are aligned horizontally to each other. So in order to find a specific winding or a specific contact, etc., one runs on the vertical spindle, which bears the switch or relay designation, down to the point where the symbol of the specific winding is. From this reference point, one then moves in a horizontal line to the actual switching diagram, on which the switching element sought can then be easily found. For example, the contacts of the auxiliary holding relay SXa in FIGS. 2 a or 3 a are sought. You can find it first on the key blade 4J ₄ on the ^ X spindle at the place with the number 1 (3 a). This note says first of all that the contacts in the Fig. 3a are shown. If one goes now at the level of this reference point SX ι (3 a) horizontally from the key blade to FIG. 3a, one finds the. Contacts slightly in the circuit diagram of this figure, to the left of the six circles labeled DSa.

For a general understanding of the invention, reference is made to FIG. 1, in which the duplex elevator system selected to explain the principle of the invention is shown with respect to various parts. The arrangement is the same for each elevator. Each elevator is moved up and down with the help of the elevator motor AM , which drives a conveyor disk FT over which the conveyor ropes FS for elevator P and counterweight GW run. Furthermore, there is an electromagnetic brake EB , by means of which the elevator is finally stopped and held in its holding position,

Each elevator is provided with a floor selector W , by which the direction of travel of the elevator is set and its stopping is effected. The floor selector W is driven with the help of a belt ZB , which is attached at one end to the top of the elevator F , runs upwards over the W.ählera.ntriebsrad 10 and then back down to the counterweight GW , to which it is attached at its other end is. The drive radio is arranged on the selector drive shaft 11, which drives a chain 12 attached to a cross head 13 and driving it. The crosshead carries brushes which are able to touch stationary contacts for the various floors, and also a direction control curve which is a combination of brush and, furthermore referred to as direction switch, used for direction and follow-up control

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Able to operate switches. These elements are later used in connection with the Schaltscheniatas are explained in more detail.

There is an up and a down button on each mezzanine floor, while there is only one button on each of the two end floors. These buttons are called floor buttons SK and. are assigned to all elevators. Each elevator has its own

ίο Set of buttons, one for each floor, which are arranged on an elevator panel FTa and are usually referred to as elevator buttons. The invention is to be described in connection with floor and elevator buttons of the push button type, which regulate the vehicle operation in connection with the selectors and other control devices by means of floor relays, the floor relays and certain control switches can be arranged on the floor selectors, while other electromagnetic control switches sit at the control panels.

Each elevator is provided with a door operating device TE for the elevator door FaT and the shaft door ST . This device operates the elevator door via a lever 14, while the connection to the shaft doors ST is effected by a sensor 15 on the elevator door FßT and rollers 16 on each shaft door.

Since this device is well known, it will not be described in detail.

With regard to the circuit diagrams of FIGS. 2a, 2b and 3a, the following should be said: FIG. 2a shows the different control circuits for one elevator, namely the circuits for call recording, for call storage and automatic call cancellation, for the direction of travel, for stopping the end station and the highest reputation and continue the control circuits to the elevator under certain Use operating conditions to support another elevator. Fig. 2 b shows similar ones Circuitry for the other elevator, but does not contain certain circuits common to both ferries Control circuits of FIG. 2 a. Fig. 3a shows further control and supply circuits for one Elevator. Similar circles intended for the other elevator are not shown.

In order to facilitate the illustration of an example of the invention, the illustrated control system compared to the tax systems applied in economically exploited facilities much simplified. Of course, when applying the invention, must be economical exploited controls numerous modifications, in particular for the purpose of adapting the invention to the extensive control circuits and the control configurations not shown here and devices are made.

For the sake of simplicity, the invention will be described as applied to a system with a three-phase alternating current supply network. The AC feed lines are labeled I, II and III. KS is a three-pole knife switch for connecting the system to the mains. A polyphase rectifier RE is provided to generate the operating direct current for the 65 floor relays and electromagnetic switches from the alternating current. The direct current feed lines H ⁷ 1 and W 2 from the rectifier RE extend from FIG. 3 a to FIG. 2 a. All 70 elevators have similar facilities. Disconnectors for changing the operating type are generally designated with CU .

The electromagnetic switching means used in the controller are 75 as follows designated:

A. Up reverse switch AS Approach switch AU Up reversing switch relay B. Down reverse switch BA Basement counter BD Down-reverse switch relay BP Pass-by desk BX Auxiliary overhaul switch CBH Follow-up call switch CC Elevator button relay CDN Down call elevator relay CK Elevator call switch CT Reverse resistance relay CUP Up elevator relay DC Door lock switch DHC Downstairs call switch DL Auxiliary door relay DO Door opening switch DR Door relay Double room Door re-opening relay FC Starting relay GH Auxiliary door closing relay GW Elevator door contact switch HC Factory call relay HD Downstairs call switch HL End station holding relay HLR End station reversing switch HO Factory reopening relay HU Switch to downstairs call K Acceleration switch LD Downward Reversing Auxiliary Switch Relay LU Up-reversing auxiliary switch relay LUD Up and down relays P. Power switch Pc Call pass switch Rc Reversing switch s Hold relay SC \ ^ orwäh] switch SX Auxiliary hold relay TG Transfer switch TGX Commissioning supervisor TT Waiting relay TX An approach t ν er s age r r <el a i s UC Call switch to follow up UHC Upstairs switch XTT Forward call switch Z Timing relay

In the description below, these 125 reference numerals are the windings of the specified

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Assigned to the switch. In conjunction with reference numbers, they are also used to designate the contacts of these switches. In a corresponding manner, the release winding of the electromagnetic brake EB is denoted by BR , and this winding and the contacts actuated by the brake are inserted into the winding schemes. To distinguish the control elements belonging to the two elevators, their reference symbols are also indicated

ίο the small letters α and b have been added.

The circles are shown as "continuous," that is, "across the network," with the windings and contacts of the various switches separated in such a way that the circles are as simple and direct as possible. The relationships between these windings and contacts can be seen in Figures 4S ₁ , 4S ₂ , 4S ₃ and 4S ₄ , in which the windings and contacts of the various shakers are arranged on spindles. The floor contacts are shown in Fig. 4S ₁ in alphabetical and numerical order. The remaining switches are shown in FIGS. 4S ₂ , 4S ₃ and 4S ₄ in alphabetical order. On each spindle sheet all switches are shown with all contacts and windings, the number of the figure in which the element occurs is indicated in brackets, namely after the reference number for the contacts. The windings and contacts on each spindle blade are arranged in line with their position on the relevant circuit diagram. One can find the winding or the contact for any particular switch by picking up the sheet of paper on which the switch is indicated. notes the figure number attached to the relevant winding or contact in brackets and aligns the spindle blade horizontally on the blade with the figure indicated. Then on this figure one finds the winding or the contact in horizontal alignment with the winding or the contact on the spindle blade. In order to find the contacts DC1 α , for example, one will find on the spindle sheet 4s2 that the contacts of the switch DCa labeled 1 have the additional designation 3 α in brackets. This means that these contacts occur in Fig. 3a. They can then be found by aligning the sheet with FIG. 3 a with the sheet with FIG. 4S _2. Then you will find these contacts in Fig. 3a in alignment with the contacts in Fig. 4S ₂ .

In Figs. 2a and 2b, the control circuits for a five-story and basement facility are shown, namely the up buttons are labeled UB and the down buttons DB , with the identification of the associated floor by digits and the letter T for the top floor or B for the basement are added. The elevator buttons for the elevator α are shown in Fig. 2a and those for the elevator & in Fig. 2b and denoted by CB , again for the purpose of identifying the assigned floor ■ digits for the mezzanine floors and the letter T for the 'top floor or the letter B for the basement has been added.

The floor relays operated by the floor or elevator buttons are corresponding to the control buttons 70, namely the floor button relays with C and the floor button relays with U or D , depending on whether they belong to the up-floor buttons or the down-floor buttons . In order to identify the floors assigned to the relays, these letters are connected with digits and the letter T for the top floor and B for the basement. The floor relays remain in the working position after actuation and consequently allow the push button to be released. After answering a call, the floor relay is reset, which automatically clears the call. Different forms of floor relay can be used. A floor relay was shown, which is kept in the working position after switching on ■ due to residual magnetism.

The SitockwerkrelaiiS are used to control the elevators via the floor selector, the various elements of which are shown for the elevator α in FIG. 2 a and for the elevator b in FIG. Carried by the cross head 13, designated FDC direction control cam consists of two sections, ^from: which, however, is the lower electrically conductive, the upper non-conductive. Of the direction switches that work together with the control cam and are labeled FH , there is one for each floor; they are set apart from one another in accordance with the distance between the associated floors. Each direction switch consists of a combination of brush and switch. When an elevator stops on a floor, the brush part of the one assigned to this floor rests. Direction switch in the middle of the upper section of the direction control curve. The brushes carried by the crosshead include an up-landing call pick-up and reset brush UHS, a down-landing call pick-up and reset brush DHS, an elevator call pick- up and reset brush UCS for upward travel, an elevator call pick-up and reset brush DCS for downward travel, an upward landing call auxiliary brush UHR, a downstairs call auxiliary reset brush DHR and an elevator call auxiliary reset brush CAR. The stationary contacts actuated by the elevator call brushes are designated CP, the contacts actuated by the upstairs landing paging brushes are designated UP, and the contacts actuated by the downward landing paging brushes are designated DP. An additional combination of brush and switch UCB is also carried by the cross head 13, each with one floor

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associated stationary contacts UCC cooperate and serve to store the fact that there is an up call below the elevator set for upward travel. In addition to the aforementioned elements, each selector is provided with a stationary terminal contact HLC and a stationary basement contact BLC , which can be operated by the terminal brush HLB carried by the crosshead 13 when the elevator is at the terminal or in the basement. The stationary contacts are arranged at a distance from one another in accordance with the spacing between the associated floors. The fixed contacts belonging to the individual floors and the directional switches FH are identified by added reference numbers and the letter T for the top floor and B for the basement. On the crosshead 13 sit an up-stop switch USS and a down -stop switch DSS and are operated by control cams assigned to each floor as soon as the elevator arrives at the floor in question in the direction of travel for which the stop switches are provided. The corresponding stationary contacts DP, UP and UCC of the voters according to FIGS. 2a and 2b are connected to one another by cross-connecting wires, which are generally designated as WD, WU and WCC .
To facilitate understanding of the invention, the processes involved in starting and stopping an elevator, for example elevator a, will first be described together with the mechanisms and control circuits used.

The elevator motor AM is shown as a three-phase cage induction motor, the stator windings of which are denoted by MO τα, MO 2 α and MO 3 a and the rotor winding by MORa . SRi α and SR ^ a are resistances in the circle of the stator windings of the elevator motor. The elevator door contacts are designated with CSa and the shaft door contacts with DSa. The door operating motor is shown as a three-phase cage induction motor, the stator windings of which are labeled DM 1 a, DM 2 α and DM3 α and the rotor winding of which is labeled DMRa . DSR 1 α and DSR 3 α denote resistances that are in the circle of the stator windings of the door operating motor.

A double-cutting alarm stop switch ES 1 a, ES2a is provided in the elevator. The contacts of the various safety devices are marked with the keyword "alarm" (see, for example, FIG. 3 a). End station limit switches are designated UPLa and DNLa and limit switches influenced by the door operating device are designated DO L ία, DCLi a, DCL 2 α and D0L2a. DZLa is a door zone limit switch that is carried by the elevator and closed by control cams (not shown) located in the elevator shaft on each floor. MCCa is a switch that responds to the load in the elevator. The other resistors used in the control are generally designated with Ra and the capacitors generally with COa . All electromagnetic switches are shown in the de-energized position and all interlocking switches in reset.

It is assumed that the elevator α is out of operation on the main floor, its selector being shown for this operating condition, and that furthermore the alarm stop switch ESi a, ES 2 α for this elevator is closed and the alarm stop switch ES 1 b, ES 2 b for elevator & is open. Under these conditions, only the switch TGa, but not the switch TGb , is actuated, whereby the contacts TG 2 α are closed and the circuit for the winding of the starting relay FCa is completed. The circuit runs via the contacts FC ^ b, which are closed due to the non-actuation of the switch FCb as a result of the separation of the contacts TG 2 b . As a result, the switch FCa is operated. Since the elevator α is out of operation, the door on the first floor, and the elevator doors are closed, the door contacts DSa and the elevator door contacts GSa so engaged.

It is now assumed that a waiting passenger on the third floor presses the floor button UB 3 belonging to this floor. This closes the circuit for the working winding of the step-up relay 3 U for the third floor, whereby this relay separates the contacts 3 U 1 and the contacts 3 U 2, 3 C / 3 a and 3f / 3 & closes, which also after the release of the Button to stay in this position. The contacts 3 U 3 α close a circuit for the windings of the relays LUa and AUa via the contacts GIT2a, Z2a and FC2a, resistors RSa, contacts 3 £ / 3 », switches PH J, a, FH 4 a and FPITa, the windings LUa and AUa and contacts BD 3 α. The relay LUa now works and separates the contacts LU2 a in order to make the auxiliary reset brush DHRa ineffective for the upward movement. It also closes the contacts LU6 a and thereby builds up the holding circuit for the windings of the relays LUa and AUa . The relay AUa separates the locking contacts AU 3 α in the circle for the winding of the relays BDa and LDa and furthermore closes the contacts AU 1 a, while a circuit via the contacts DZ 2 α and Z τ α for the winding of the stopping relay Sa is completed. The relay Sa closes the contacts S1 a and thereby completes a circuit for the winding of the relay SXa. This relay SXa completes a circuit for the windings of the switches Aa and Pa when actuated, which these windings, the contacts B 1 a, the upward limit switch UPLa, the contacts LUi a and SX ι a, the door contacts DSa and GSa and the alarm stop switch ES2 α contains. The switch Aa , when actuated, separates the locking contacts A2a in a circle for the winding of the switch Ba and furthermore the contacts A 3 a, whereby the brushes DHSa and DCSa are ineffective for the upward travel. In addition, the switch

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ter Aa the contacts A 5 α and A 6 α and thereby prepares the circles for the stator winding of the Fährstuhaufzugsmotors for a phase rotation of the applied voltage for upward travel. When actuated, the switch Pa closes the contacts P S α and P6a of the circuit for the stator windings of the elevator motor. At the same time, the contacts P2a, P ^ a and A4a close the circuit for the brake release winding BRa. This releases the brake and sets the elevator in motion upwards.

When the brakes are released, the contacts BR ι a separate, whereby the resistor R 16 α is in the circle with the brake release winding.

! 5 is switched. By closing the contacts P '3 α and A4a , a circuit for the windings of the switch Ka and the relay DLa is also closed. When actuated, the relay DLa closes the contacts DL 3 α and thereby a circuit for the winding of the relay DRa. This relay DRa closes the contacts Pi? 3 »for the purpose of building a self-holding circuit and furthermore the contacts DR 1 a, while the contacts DL 2 a are now separated, the closure of a circuit for the windings of the switches DOa and DZa being prevented. In addition, the relay DLa closes the contacts DL 1 α of a circuit for the winding of the timing relay Za. This relay Za disconnects the contacts Z 2 a when actuated, but this has no effect as they are bridged by the contacts LU6α. In addition, the relay Za separates the contacts Zi α and interrupts the circuit for the working winding of the relay S, which is of the floor relay type and remains in the operating position when the circuit for its working winding is interrupted. Furthermore, the switch Pa separates the contacts Pia and thereby interrupts the circuit for the auxiliary reset brushes while the elevator is in motion.

The switch Ka does not work immediately when the circuit is closed for its working winding because it is delayed by a shock absorber, but then closes the contacts K 2 α and K4a after actuation, whereby the resistors SR ι α and SR 3 a in the circuit for the stator windings of the elevator motor is short-circuited and the torque is increased to full travel mode.

As soon as the elevator approaches the third floor, the brush UHSA touches the stationary contact UP 3 α, and thereby completes a circuit for the reset coil of the latching relay Sä via the resistor R 5 a, the contacts α B 3 and BP 1 a, brush UHSA, Contact UP 3 α and contacts 3 C / 2 and the reset winding for the step-up relay 3 U for the third floor. The voltage thus imposed on the reset winding of this floor relay is not sufficient to reset the relay, but is sufficient to reset the holding relay. As a result, contacts S1 a separate, opening the circuit for the winding of relay SXa, and also contacts 5 * 2 a close, increasing the voltage imposed on the reset winding of step-up relay 3 U for the third floor, resetting the relay and so that the call is canceled automatically. When brush UHSa and contact UP ^ a touch each other, the isolated upward section of control curve PDCa moves into engagement position with direction switch FH 3 α for the third floor, whereby the circuit for the winding of relays AUa and LUa is interrupted and these relays to Waste to be brought. As a result, the contacts LU 1 a separate, which together with the separation of the contacts SX ι α causes an interruption of the original excitation circuit for the windings of the switches Aa and Pa . However, these windings remain energized via the contacts A ι α and the upstop switch USSa . As soon as the elevator comes a certain distance to the third floor, the upward stop switch USSa is opened, whereby the circuits for the windings of the switches Aa and Pa and thus at the same time the circuits for the stator windings of the elevator motor are interrupted, the brake release winding BRa is de-energized and the brake is applied to stop the elevator on the third floor.

By using the contacts A 4 α and P 3 a when the elevator is stopped, the circuit for the windings of the switch Ka and the relay DLa is interrupted. The relay DLa closes the 'contacts DL 2 α when it drops out and thereby closes a circuit for the winding of the relay DZa via the now closed door zone limit switch DZLa and the contacts DR 1 α and a circuit for the winding of the switch DOa via the limit switch DOL 1 α . The door opening switch DOa closes the contacts DO 2 α and DO 3 a, whereby the stator windings of the door actuating motor are energized for the purpose of opening the elevator door and the landing door on the third floor. The door reopening relay DZa connects the contacts DZ 1 a with the transmission contacts DL 1 α and thereby keeps the timing relay Za in operation. When the doors begin to open, the limit switch DCL 2 α closes to complete the circuit for the windings of the relay GHa, which is operated as long as the doors are outside their open position.

However, when the doors have reached their open position, the limit switches DOL ι a open. and D0L2a. Opening the first limit switch DOL τ α breaks the circuit for the winding of the door opening switch DOa and opening the second limit switch D0L2a breaks the circuit for the winding of the door relay DRa , causing these switches to drop out. When the switch DOa drops out , the circuit for the door operating motor is interrupted. The drop-out of the relay DRa , on the other hand, causes the interruption of the circuit for the winding of the door reopening relay DZa, which causes this relay

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drops and causes an interruption of the circuit for the winding of the timing relay Za . The relay is delayed by the discharge of the capacitor CO 4 α in order to give the passenger time to enter the elevator, to press the elevator button for the desired station and thereby determine the direction of travel of the elevator.

Assume that the one on the third

Passenger waiting on the fourth floor

ίο going floor wishes that he enter the elevator ■ and press the elevator button CB4a for the fourth floor. This closes the circle for the working winding of the elevator button relay 4Ca for the fourth floor, which comes into operation and automatically locks in the working position. That caused thereby closing the contacts 4C2 α closes via the contacts Ki α and the direction switch FH4a and FHTa a circle for the windings of the relay Lua and AUA. In addition, when the elevator button for the fourth floor is pressed, a circuit for the winding of the relay CCa is closed, which when actuated closes the contacts CC 1 α and thus via the contacts DZ 2 α and DR 2 α and the now closed limit switch DCL 1 α closes a circuit for the winding of the door closing switch DCa. When it is actuated, this switch closes the contacts DC1 α of a circuit for the winding of the relay CTa, which in turn closes the contacts CT 1 α and thereby creates a hold circuit for the winding of the switch DCa . This switch DCa also closes the contacts DC 2 α and DCj, α and thereby forms a circuit for the stator windings of the door operating motor for the purpose of closing the doors. When the doors come into the closed position, the switch DCL 1 a opens and thus causes the switch DCa to drop out. In addition, the closing of the contacts CC ι α forms a circle for the working winding of the stopping relay Sa via the contacts AU 1a . As a result, the closing of the doors and the resulting closing of the door contacts DSa and GSa via the contacts LU 1 a and SX ι α a circuit for the windings of the switches Pa and Aa is closed. These switches work as described earlier and cause the elevator to start up in the upward direction. After the contacts K 1 α have been separated, the circuit for the windings of the relays LUa and AUa is maintained by the contacts LU 3 α .

When the elevator approaches the fourth floor, the upward brush UCSa touches the stationary contact CP 4a, thereby closing a circuit for the reset winding of the stopping relay Sa and causing it to be reset. As a result, ¹ deleted the Fahrstuhlruf for the fourth floor automatically, the lift decelerated and finally brought to a stop in the manner described earlier on the fourth floor. In addition, the interaction of the upper section of the control curve FDCa with the switch FH4a causes the relays LUa and AU α to drop out. In addition, immediately after stopping, the landing door on the fourth floor and the elevator door open automatically. As soon as the doors reach their open position, the circuit for the winding of the timing relay Za is interrupted. As mentioned above, the release of this relay is delayed in order to give the passenger time to leave the elevator. If there are no unanswered calls after the delay time of this relay has expired, a circuit for the winding of the door closing switch DCa is established by closing the contacts Zi α again, so that this switch is actuated and the door is closed.

When a button is pressed that calls for the elevator to descend, it is started downward and slowed down and stopped at the floor for which the button was pressed. A detailed description of this process does not appear to be necessary, as it is easy to understand based on the above description of elevator operation in the upward direction. In order to set the elevator in motion downwards, the relays BDa and LDa and the switch Ba are actuated instead of the relays AUa and LUa and the switch Aa. The circuit for the windings of the two relays LDa and BDa is closed in the case of floor calls above the main floor with the help of contacts GH2a, Zae and FC2α and in the case of a floor call from the main floor or basement by contacts TG3b and BA2b . If the elevator is set in motion downwards due to a downward floor call, it is slowed down and stopped on this floor by the contact of the brush DHSa with the stationary contact DPa for the floor for which the call was stored. When the elevator is up. When an elevator call was set in motion downwards, the deceleration and stopping on the floor corresponding to the call storage takes place due to the contact of the brush DCSa with the stationary contact CPa of this floor.

The elevator is also slowed down and stopped on the basis of a downward floor call during the upward journey and on the basis of an upward floor call during the downward journey, if no circles have been established that require the elevator to travel beyond the floor on which the button is located. Let us assume, for example, that in the case of an elevator located on the main floor, a passenger waiting on the second floor wishes to be driven to the first floor and consequently presses the down floor button DB 2 on the second floor. As a result, the relay 2 D is in operation for the second floor and in the operating position for self-locking. brings. The resulting closure of the contacts 2 D 3 α closes a circuit for the relays LUa and .AUa, whereby the elevator is set in motion upwards. When the elevator ₍

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Approaching the second floor, the upper, isolated section of the control curve FDCa opens the switch FH 2 a, which interrupts the circuit for the windings of the relays LUa and AUa in the absence of stored calls for a floor above and causes these relays to drop out. The resulting separation of the contacts LU ι α causes the elevator to slow down and stop on the

ίο second floor. If the doors start to open after the elevator has stopped, the contacts GH ι α close and close a circuit via the contacts DZ 4 a, the resistor Ria, the contacts Pia, the contacts LU 2 a and BP 3 a, the Brush DHRa, the contact DP 2 a and the contacts 2 D 2 for the reset winding of the relay 2 D, whereby the downward call from the second floor is automatically canceled.

In a similar manner, the controller operates to bring the elevator up by pressing an upward stroke button to move down a floor below the elevator and to move the elevator during its Stop downward movement on the floor for which the floor button has been pressed, as long as there are no circles that go down the elevator below this floor leave.

In both of the aforementioned examples, it was assumed that only one button was pressed. However, the control also works to stop the elevator on every floor for which a button has been pressed if several buttons are pressed, ie also in the case of "collective" push-button operation. Stopping takes place in each direction of travel in the natural sequence of floors, regardless of the sequence of button actuation. It is assumed, for example, that the elevator is set in motion upwards from the main floor due to an elevator call for the fourth floor and that, before the brush UHSa has touched the fixed contact UP 3 α , the upstairs button UB 3 of the third floor is pressed and thereby a Up call for the third floor is stored and the contact UP 3 α has been made effective. Touching the brush and the contact then resets the stop relay Sa, which slows and stops the elevator on the third floor and automatically clears the call for the third floor. When the elevator stops, the doors open automatically. It is now assumed for the sake of simplicity that no passenger enters the elevator.

After the waiting time caused by the relay Za has expired, the contacts Zi α close and the door lock switch DCa close the doors. As soon as the doors reach the final position, the switches Pa and Aa are actuated by closing the door contacts DSa and GSa and the elevator is set in motion upwards. The contacts LU1 α in the initial excitation circuit for the windings of the switches Pa and Aa are closed as a result of the storage of the elevator call for the fourth floor, and the contacts SX 1 α are also closed as a result of the actuation of the relay Sa by closing the contacts Zi α .

The elevator is not stopped by any interim call downwards when traveling upwards , since the elevator call for the fourth floor keeps the relays LUa and AUa in operation when the isolated upward section of the control curve FDCa comes into contact with the switch FHa for the floor for which one intermittent downward call has been stored. When the elevator approaches the fourth floor, by touching brush UCSa and contact CP4a, the elevator on this floor is slowed down and stopped and the ferry call for the fourth floor is canceled in the manner described earlier.

From the above description it can be seen that when the elevator is traveling upwards, the stopping takes place on the basis of upstairs and elevator calls in the natural floor sequence regardless of the sequence in which the buttons are pressed. Furthermore, there is also a halt on the basis of a downstairs call, provided that no pushbutton has to be answered for a floor above. As long as an elevator or landing call for a higher floor is stored before the landing relay is reset for the floor at which a stop is to be made, a circuit is maintained for the windings of the relays LUa and AUa , which the elevator after the passenger change and is set in motion upwards again when the doors are closed.

Undoubtedly there is no further detailed description clear that when the elevator is going down due to all downstairs and elevator calls in the natural sequence of floors and regardless of the sequence in which the push-button is pressed is stopped. Furthermore, there is a stop due to an upstroke call, provided that no call for a floor below has gone unanswered.

It is possible that a push button on a floor is pressed more than once before the elevator is stopped on the floor belonging to this button, and the button can be pressed again after answering the call after the floor relay belonging to this button has been reset. A relay put into operation due to such a delayed push-button actuation is closed again by the brushes UHRa and DHRa. ■ reset, with the brush UHRa for the upward travel and the brush DHRa for the downward travel. The reset circuit is built up by opening the doors after the elevator has stopped and runs via the contacts GH ι α and DZ 4 a, the resistor R ι α and, the contacts Pia, BP 3 α and either LU2a or LD 2 a.

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It can also happen that a push button is pressed on the floor on which the elevator is at rest with the doors closed. In this case, actuation of the push button causes the doors to be reopened by actuating the relay HOc. The circuit for the winding of this relay runs, depending on the operating conditions, as can be seen from the explanations below, through one of the contact pairs HL ι a,

ίο FCi α and HLzb, via the resistor R ι a, contacts Pia, BP $ α and either via the contacts LD 2 a, the brush UHRa and the contact UPa of the elevator location floor and the contacts U 2 and the reset winding of the upstairs relay U for this Floor or via the contacts LU 2 a, brush DHRa, the contact DPa for this floor and the contacts D 2 and the reset winding of the downstairs relay D of this floor. The relay HOa closes the contacts HO 1 a when actuated, whereby a circuit for the windings of the relay DZa and the switch DOa is closed. The switch DOa causes the doors to open, while the relay DZa closes the contacts DZ 4 α , which together with the closing of the contacts GH 1 a supply enough current to the reset function of the floor relay to cause it to be reset when the door begins to open. In addition, the relay DZa closes the loop for the winding of the relay Za in order to set the delay time again.

After the operation of a single elevator has been described so far, the operation of two elevators under "duplex" control will now be explained with reference to both FIGS. 2 b and FIGS. 2 a and 3 a. During this operation, the alarm stop switches ES of both elevators are closed. For the following description it is assumed that the off switches CU1, CU2 and CUt are closed for both elevators, the off switches CU4 and CU 5 and also the off switches CU6, CUy and CUS are open for both elevators. The circles are for the terminus on the main floor, ie

the anteroom floor, shown, which in the presence of a basement, as shown, the first floor is.

The description of the operation of elevator a both on the basis of a landing call and on the basis of an elevator button pressed by the passenger, which saved a landing call, is above and should not be repeated. After stopping on the floor for which the elevator button has been pressed, the elevator remains on that floor, provided that no other pushbuttons have been pressed, and thus becomes a free elevator. If a floor button is pressed for another floor while the elevator is idle, the elevator is set in motion and the call stored by this floor button is answered, regardless of whether it is an up or down call and for which floor it was made. This elevator continues answering the stored landing calls, provided they are not behind it, and works as an occupied elevator. The other elevator b, which is idle under the assumed conditions at the terminus, acts with regard to the floor buttons as an elevator available to support the occupied elevator and at the same time serves to accommodate passengers at the terminus in order to bring them to their destinations. An elevator waiting at the terminus is therefore called an »terminus« elevator.

If an elevator works as an occupied elevator and has a certain direction of travel, then the storage of a call behind it causes the end station elevator to be put into operation for its support. The term "trailing call" is intended to denote an up call for a floor above the terminus, which is located behind an occupied elevator set for upward travel, if its storage after disconnecting the brush switch UCB of this elevator from its fixed contact UCC for the ' The floor for which this call is saved takes place. If the call stored under these conditions is a down call, it is not considered a "lagging call" because the occupied elevator is still in such a position that it can answer this call when it is going down later. If the occupied elevator is set to go down, either an upward or a downward call for a floor above the terminus is a subsequent call if it is activated after separating the upper section of the control curve FDC for the occupied elevator from the switch FH of the corresponding floor is registered. A previously stored up call for a floor above the end station becomes a lagging call if one or more buttons have been pressed for floors below the one for which the up call is stored as soon as the upper section of the control curve FDC for separates the occupied elevator from counter FH on the corresponding floor. Furthermore, a call is not trailing if the elevator is on a floor and its direction of travel is not set so that the elevator moves when leaving this floor in the correct direction for answering the call.

A terminal elevator is put into operation on the basis of an elevator call for a higher floor, regardless of whether it is behind the other elevator that is in operation or not. The storage of such a call causes the windings of the relays LU and AU of this elevator to be energized through its contacts Ki, thereby setting it in motion upwards. As this was described earlier

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it need not be repeated; rather, the description is intended to refer to the commissioning a second elevator due to a landing call following the occupied elevator be restricted.

If the elevator α is at the end station, then the winding of the upward trailing call - switch UCa via the contact UCC ι a, the brush arm of the switch UCBa and

ίο the contacts TG ι α energized. It is assumed that the elevator α has been set in motion from the end station due to a call for the fifth floor upwards. While the elevator moves up the shaft, the switch UCa remains in operation between the floors with the help of the holding contacts UC ι α and the switch UCBa and on the floors with the help of the floor-related fixed contacts UCCa and the brush arm of the switch UCBa. It is now assumed that after the switch UCBa has been disconnected from the fixed contact UCC 3 α, the upstairs button UB 3 on the third floor is pressed. This actuates the third floor relay 3 U and separates the contacts 3 U 1. This interrupts the circuit for the winding of the switch UCa when the switch UCBa and the stationary contact UCC4a for the fourth floor are touched. As a result, the contacts UC 2 a close and close a circle via the contacts TG 2 b and LU 4 ά and the switch CU 2 b for the winding of the start relay FCb, whereby this relay comes into operation. It is further assumed that elevator b is at rest at the end station and is therefore the end station elevator. Then by closing the contacts FC 2 b as a result of the action of the relay FCb via the contacts GH 2 b and Z 2 b, the resistor R8b, the contacts 3 Uj, b, the switches FHJ, b, FH4b and FHTb and the contacts BD 3 b a circuit closed for the windings of the relays LUb and AUb. As a result, the elevator b is set in motion upwards in the same way as has been described for the upward movement of the elevator a from the main floor.

Now it is assumed that the elevator b is the end station ferry chair and is at rest on the main floor, that the elevator α travels downwards and that after it has passed on the third floor either the up or down button is pressed there. The resulting closing of the contacts 3 f / 3 α or 3 D 3 a closes a circuit via the contacts GFI2a, Z2a and FC2 a, the resistor R 8 a, the switches FH 3 a FH4 a and FHTa and the contacts LD 3 α for winding the call pass switch PCa. When it is actuated, the contacts PC 1a close a circuit for the winding of the relay FCb via the contacts TG2b and the switch CU2b, which causes the elevator b to start up in the upward direction in the manner described above.

It is now assumed that both elevators are at rest, namely elevator b on the terminus and elevator α on some mezzanine floor. If an up button is pressed on a floor that is below elevator a but above the terminus, this does not cause elevator b to start, since contacts LU4 α are separated and, as a result, when contacts UC 2 a close, the circle for the winding of the relay FCb remains open. Instead, however, elevator a is set in motion downwards to answer the call. Likewise, pressing an up or down button on a floor above the stationary elevator α does not cause the elevator b to start because the contacts LD 3 α are open, the circuit for the winding of the switch PCa is open and, as a result, the relay FCb remains inoperative. Instead, the elevator α is set in motion upwards to answer the call. In addition, pressing an up or down button on the floor where the elevator α is idle does not cause the elevator b to start because the contacts LU4a and LD 3 α are separated, because the switch UCa and the switch also work under these conditions FHa this floor is open. As a result of the actuation of the switch UCa , the starting of the elevator b due to an upward call for the floor on which the elevator α is located is prevented when the elevator α is set to travel upwards. Furthermore, the open position of the switch FHa for the floor on which the elevator α is, prevents the start of the elevator b due to an upward or downward call on this floor, if the elevator α is set to go down. Finally, pressing a down button on the floor on which the elevator ο is standing or on a floor below if the elevator α is set to upward travel does not cause elevator b to start, since such a call does not affect switch UCa.

As soon as the elevator b has been set in motion once, it is stopped by shouts in a manner similar to that described for the elevator α. In the case of ferry chair calls during the upward journey, stopping is initiated by touching the brush UCSb with the contacts CPb of those floors for which such calls are stored, and during the downward journey by touching the brush DCSb with the aforementioned contacts CPb . Because of upstairs calls, the stopping of elevator b by touching brush UHSb with stationary contacts UPb for the floors for which such calls are stored, and because of downstairs calls by touching brush DHSb with the aforementioned, stationary contacts DPb initiated. Elevator b can also be stopped when traveling upwards due to a downward floor call if no call influencing the elevator is to be answered for a floor above the floor

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that the down call is stored. Similarly, the elevator b can also be stopped when traveling downwards by an upstairs call, if no call influencing it has to be answered for a floor below the floor for which the up call was stored. This stop is initiated by touching the upper section of the control curve FDCb with the switch FHb for the corresponding floor, as has been described for the elevator α . If both elevators are in operation, then the elevator that stops at a floor with a stored floor call is the elevator that is running in the correct direction of travel,. 15 whose call recording brush UHS or DHS first touches the fixed contact of the floor for which the call is stored for this direction of travel, or if there is a call for the opposite direction of travel, that travel

ao chair whose upper section of the control curve FDC first touches its switch FH for this floor. If both elevators respond to calls, they can both be regarded as occupied elevators. Which elevator then returns to the terminus depends on the operating conditions. The starting of an elevator on its automatic return journey to the end station is caused by the fact that an end station return circuit is set up for this elevator. This end station return circuit runs, for example, for the elevator α via the contacts TT 3 a, BX 2 b and FC 5 a, the resistor Ri2a, the switch FH 1 α and the switch FFIa below the elevator, via the lower section of the control curve FDCa, the windings of the relays LDa and BDa and the contacts AU3 a. The purpose of the contacts TT 3 α and BX 2 b will be described later; at the moment it is assumed that they are closed. When the elevator α reaches its highest call, it loses its setting for upward travel, as a result of which the contacts LU 5 α open. If there is then no call behind the elevator b to energize the winding of the relay FCa , then by opening the contacts LU 5 α the circuit for the winding of the relay FCa is interrupted, causing it to drop out, the contacts FCa close and the End station return circuit for elevator α is closed. With the assumed return of the elevator α to the end station, the contact of the upper section of the control curve FDCa with the switch FH ι α causes the elevator to stop on this floor when approaching the end station. When the relay FCa drops out , the contacts FC 3 α also close and thereby keep the relay FCb in the operating position. As a result, when the last call is answered by elevator b, its terminal return circuit is not closed, and it remains on the floor on which it last stopped.

If an elevator call is stored for an elevator on its automatic return journey to the terminus for a floor between the elevator and the terminus, the elevator is automatically stopped when its brush DCS * touches the contact CP for this floor on this floor. After the passenger has disembarked and the delay time has elapsed, the contacts Z ία close and the elevator automatically starts its return journey to the terminus. In the same way, when a downstairs call is stored on a floor between the elevator and the terminus, the elevator is stopped by touching its brush DFIS with its contact DP for this floor and automatically resumes its journey after the delay time has elapsed. If a floor call is stored behind the occupied elevator but not a call for a floor below the elevator returning to the terminus, the automatic return of the elevator to the terminus is interrupted and the elevator reverses to assist the other elevator. If, for example, elevator α is automatically returning to the end station and elevator b is set to travel upwards, then the storage of an upstairs call below elevator b causes the contacts UC2 b to close, whereby a circuit for the winding of the relay -FCa is closed and this relay is put into operation, whereby the contacts FC ^ a separate and interrupt the automatic end station return circuit for the elevator α. If the up call is above elevator α and no elevator call from elevator α for a floor below and no floor call for such a floor are stored, the relays LDa and BDa drop out, which brings the elevator to a stop on the next floor , after the delay period has elapsed, the direction of travel is changed to "up" and the elevator is set in motion in an upward direction. If the up call is below the elevator, the circuits for the windings of the relays LDa and BDa are maintained through the contacts LD 5 α and the floor relay contacts, causing the elevator to continue its descent and stop at the floor for which the up call is stored is, provided that no elevator call is stored in elevator α for a floor below this floor call. If the elevator b is going down, the storage of a floor call above it causes the switching on of the switch PCb and thus the relay FCa, whereby the end station return circuit for the elevator chair a is interrupted and the elevator in the manner described earlier to answer this call in Gear is brought. In the above example, if a floor call is stored for a lower floor, the circuit for the windings of the relay LDa. and BDa in the event

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one above the. Terminal located call via the contacts LD 5 α and in the case of a call from the terminal via the contacts LD 7 α maintained.

Accordingly, according to the arrangement shown, an elevator at the terminal station serves to service the incoming traffic, as far as the conditions permit. If a passenger enters the end station elevator and one. If you press the elevator button for a higher floor, the other elevator, if it is free, is automatically set in motion to return to the terminus. Assuming that elevator α is a stationary free elevator, then when elevator b starts upwards via the contacts TG 2 b, LU 5 b and BA ib. A circuit for the winding of the relay FCb is closed, whereby this relay works and. the contacts FC 3 b separates, which in turn causes an interruption of the circuit for the winding of the relay FCa . When this relay drops out, the contacts FC 5 a close, whereby the end station return circuit for the elevator α is closed. If, on the other hand, when elevator b is at rest at the end station, elevator α moves to the end station due to an elevator call, then when this elevator arrives, the contact between the brush HLBa and the stationary contact HLCa via the contacts S4a creates a circle for the winding of the end station relay HLa closed. When this relay is actuated, the contacts HL 3 a close, so that a circuit for the winding of the relay FCb is closed via the contacts P 4 a. This separates the contacts FC 3 b, the circuit for the winding of the relay FCa is separated, this relay fails, the contacts PC 3 α close, and ultimately the winding of the relay FCb is kept energized after the contacts P4a have been separated. As a result, the elevator α becomes the end station and the elevator b becomes a free elevator. Since the contacts HL 1 a, HL 2 a, HL 1 b and HL 2 b are open in both of the elevators at the end of the line, only the doors of the selected free elevator are automatically opened to accommodate passengers when a floor button is pressed on the first floor , since the contacts FC ι are open to the other elevator. For example, when the elevator α is a terminal elevator, its contacts FC 4 α are closed. As a result, when the button UBB is pressed, the contacts BU ^ a are closed and a circuit is closed for the windings of the relays LDa and BDa , causing the elevator to move downwards.

If, for example, the elevator & is in the basement at this time, the winding of the basement switch BAb is energized via the brush HLBb and contact BLCb , which means that the contacts BA2b are open and thus the structure of the circuit for the windings of the relay LDa and BDa is prevented. As a result, elevator a is not set in motion, but instead relay HOb is actuated and the doors of elevator b are opened. If the end station elevator is set in motion towards the basement, the other elevator for the elevator going to the basement is not automatically returned to the end station as a result of the relay FC being actuated. When pushing the elevator, for example, the elevator a, boarded in the basement passenger the button to the first floor, the relay FCa is not operated, namely by the discharge of the capacitor CO 3 α after the elapse of the brush HLBa from contact BLCA sufficient to answer function Time. long the dropping of the switch BAa is delayed. As a result, the contacts BA1 α remain separated and the development of the circuit for the winding of the relay FCa is prevented. As a result, if elevator b is free, it will not return to the ground floor. However, if the elevator button is pressed for a floor above the first floor, the contacts BA ι a close again after the elevator has passed the first floor and build the circuit for the winding of the relay FCa . If the elevator b is at rest, the resulting separation of the contacts FC 3 α disconnects the circuit for the winding of the relay FCb and causes the elevator b to return automatically to the end station, so that it becomes an end station elevator.

So far, the description of the duplex operation has been limited to assumed cases in which, after storing a floor call behind the occupied elevator, the end station elevator is put into operation to support the occupied elevator or the automatic return of the other elevator to the end station is interrupted. However, especially in heavy traffic, several landing calls can be waiting for an answer, none of which is behind the occupied elevator. Under these conditions, the end station ferry chair is put into operation or the return journey of an elevator to the end station is interrupted, provided that floor calls are stored continuously for a certain period of time. This is done by controlling the landing call relay HC, whose contacts HC 1 control the circuit for the winding of the transfer delay relay TT . As long as there is no stored call, the winding of this relay HC is kept energized via the series circuit return contacts U1 and D 1 of the floor button floor relay. This closes the contacts HC 1 and puts the relay TT into operation. As soon as a landing call is stored, the HL relay drops out, which interrupts the circuit for the TT relay to be activated. However, due to a delay caused by the discharge of the CO 2 capacitor, this relay only drops out after a certain time, for example 30 seconds. If the relay HC remains de-energized during this period and the contacts HC 1 remain disconnected, the relay TT drops out. The relay

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HC can be de-energized by various calls as long as they overlap, ie are answered under conditions where another floor call remains unanswered. These calls have no relation to the position of the elevators, since the disconnection of any contact of any floor button floor relay in the series circuit will prevent the relay HC from being energized.

ίο If the TT relay drops out due to a fixed period of call storage, the TT 3 contacts are opened and the TT 2 and TTA contacts are closed for each elevator. Assuming, for example, that the elevator α is at rest at the end station and that no landing call, which causes the relay TT to drop out, is behind the elevator b, then the contacts FC 2 α are bridged by closing the contacts TT ι α and a circuit for the windings of the relays LUa and AUa is closed, whereby the elevator α is set in motion upwards. As a result, as in the previous case, elevator α becomes an occupied elevator, which assists elevator b in answering floor calls and also responds to elevator calls made by entering passengers. If the call conditions permit, one of the two elevators is automatically sent back to the end station in the manner described earlier.

Should the above-described case of persistent call storage occur while an elevator, for example elevator a, is on its automatic return journey to the end station, then its end station return circuit is interrupted by the separation of the contacts TT 3 α and, if there is no own elevator call and no floor call for a floor below the ferry chair, the elevator on the next floor is brought to a stop and set in motion upwards again to support elevator b. If the status of the continuous call storage exists when an elevator reaches its highest call, then the separation of the contacts TT 3 prevents the establishment of its automatic end station return circuit for this elevator. If an elevator located at the end station or in the basement, for example elevator b, cannot answer an end station or cellar call within the waiting time, the contacts TT 2 α enable the other, i.e. α-elevator, to be returned, regardless of whether it is at rest or is used, to the terminus or to the basement.

In all cases where a landing call or a series of overlapping landing calls is stored for a certain period of time, an end station elevator is set in motion or the automatic return of an elevator to the end station is prevented or interrupted. However, if at some point within the waiting time all landing calls are received, then the relay HC is energized again, whereby the contacts HC ι and the circuit for the winding of the relay TT are closed. As a result, the end station elevator is not put into operation or the automatic end station return circuit of an elevator returning to the end station is not interrupted.

As soon as an occupied elevator is loaded to a certain extent, for example to 80% of its capacity, its bypass switch is activated and automatically drives past landing calls until space is created again by passenger delivery. If, for example, the elevator α is loaded by passenger up to the capacity to which the system is set, then the load switch MCCa closes, which can be arranged, for example, under the elevator floor and operated by its relative movement to the framework. With the switch closed McCallum the contacts CT is then passed through the taking place in the connection to the door Close Close 2 α a circuit for the coil of the passing switch BPa closed. This switch is a locking switch similar to the landing relay and therefore locks itself automatically in the operating position. When the doors reach their final position, the relay CTa drops by separating the contacts DC ι α , which causes the separation of the contacts CT 2 α and an unintentional actuation of the switch BPa as a result of starting or driving the elevator is prevented. When the switch BPa is operated, the contacts BP ι α and BP 2 a open, which prevents floor calls from being picked up and is set to "automatic load drive-by operation". In addition, the contacts BP 3 α are separated and thus prevented that the reopening of the door is caused by pressing the floor button on the floor in the set direction of travel. If the elevator stops due to an elevator call, the contacts DO ι α close after the door opening process and close a circuit for the reset winding of the switch BP via the contacts BP4a, whereby this is reset. As a result, a load test is carried out at each stop to determine whether there is still room in the elevator for other passengers and whether it is therefore necessary to stop because of calls to the floor.

By actuating the switch BPa , the contacts BP 5 α are also closed, whereby a circuit for the winding of the relay BXb is closed via the contacts TG 2 b and CU3 b. As a result, when elevator b is idle at the end station, the actuation of relay BXb by closing contacts BX 1 b bridges contacts FC 2 b and thereby activates this elevator to support elevator a, provided that a floor call is made to complete the upward direction Circle is saved. On the other hand , if elevator b is on its own automatic return journey to the end station at this time, then

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its automatic end station return circuit is interrupted by separating the contacts BX 2 a if a landing call causing the separation of the contacts BX 2 α is stored. This causes the elevator b to support the elevator α to turn around in the manner previously described. If the contacts BX 2 α and HC 2 b are open at the time when the elevator b reaches its highest call, then will

ίο thereby prevents the closing of the automatic terminal return circuit for this elevator b . If this elevator is an occupied elevator and its pass switch BPb should be operated, then elevator a, if it is not already an occupied elevator, is caused in the manner described above to come to the aid of elevator b. Therefore, by pressing the pass switch of one elevator, the other elevator is called for help, even though all unanswered landing calls are in front of the occupied elevator. This operating mode is to be referred to as automatic drive-by control. Individuals of the control arrangements described above for the approach of an elevator to assist an occupied elevator can be used alone or in conjunction with other controls, depending on the requirements of the particular elevator system. For the sake of simplicity, it has been described how this is accomplished with the aid of the disconnectors and how these disconnectors can be used at certain times where a change in the operating mode of the elevator arrangement is desired. Of course, in elevator arrangements in which certain such controls are not used, the related control circuits are omitted and other circuit arrangements are used.

For example, the arrangement can be made in this way

Be that another elevator is only fetched to support an occupied elevator if there is continuous call storage. This operation can - if the switch CUi is not taken into account at the moment - · be brought about by opening all other switch-offs for both elevators. If the CU 2 switches of both elevators are open, calls behind the occupied elevator have the same weight as other calls, and then there must be continuous call storage during the waiting time to allow another elevator to support an occupied elevator, regardless of whether there is a the calls in front of or behind the latter. In order to combine the control for continuous call storage with the follow-up call control, the cut-off switches CU2 for both elevators are closed. If the follow-up call control is to work alone, then switches CU2 for both elevators and preferably switch CU 4 are closed. When the switch CU 4 is closed, the winding of the relay TT is energized again when an elevator starts, namely when the elevator b starts up via the contacts K 3 b and when the elevator α starts up via the contacts K $ a. Therefore, if there is a landing call to be answered, if the occupied elevator does not start moving within the waiting time, the end station elevator is put into operation for this elevator as a result of the closing of contacts TT 1. If so desired, however, the delay system can be left aside entirely by closing switch CU 5 and pressing the Re- \. lais TT is kept in operation.

The arrangement can also be made so that a further elevator is only brought up to support an occupied elevator if the latter is sufficiently loaded to drive past landing calls. This mode of operation can be set by only. the switches Ct / 1 and CU 3 for the two elevators and either switch CU4. or switch CU 5 closes. In this case, the duration of the call storage and the relationship of the calls to the occupied elevator has no influence on the other elevator. However, every time the switch BP of an occupied elevator makes it unable to answer floor calls, the contacts BP 5 for this elevator close, thereby closing a circuit for the switch BX of the other elevator. If this switch BX of the other elevator has not already been actuated, the actuation of this switch in the manner described earlier causes the elevator to start away from the end station or the interruption of its end station return circuit. In order to combine the automatic load-pass control with the follow-up call control, switches CU1, CU2 and CU 3 for both elevators and either switch CU 4 or CU 5 are closed. In order to combine the automatic load pass-by control with the control for continuous call storage, only the switches CU ι and CUt are closed for both elevators, and in order to also use the follow-up call control, the switches CU2 for both elevators are also closed closed. It may be desired to initiate the automatic load drive-by control for each elevator without regulating the start-up or the automatic return to the end station of the other elevator through this drive-by operation. This can be achieved by opening switches Ct / 3 for both elevators, but keeping both switches CU 1 closed.

If it is desired that after the start of the automatic return to the end station, each elevator runs to the end station in spite of continuous call storage, then switch CU6 for each elevator is closed for the purpose of bridging contacts TT 3 for this elevator. If each elevator is to continue its journey after the start of its automatic return to the end station despite the setting of the other elevator to bypass floor calls, the switch CU'7 is closed for each elevator in order to bypass its contacts BX 2. When

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furthermore, each elevator should continue its return after the start of its automatic return journey to the end station despite the storage of calls behind the other elevator, then the switches CU 8 of both elevators are closed. In the case of elevator α , for example, the closing of switch CUSa causes a bypass circuit via contacts FC $ a if it is set to downward travel when contacts LDSa are closed and relay FCb of elevator b is in operation and thus contacts FC 6 b are closed.

In FIGS. 5 a, 6 a, 5 b, 6 b, 5 c and 6 c, some circuits for controlling a system with three elevators are shown. Fig. 5 a shows the landing call memory circuits for all elevators. In Figs. 5 a, 5 b and 5 c, the circles for the elevator call storage, the call recording, the automatic call storage, for the direction, the end station, the approach, the highest call and the assistance are shown for each elevator. FIGS. 6a, 6b and 6c contain for each elevator the circles for elevator reversal, elevator selection, passing, continuous call and further direction and starting circles. Each elevator then has further circles, as they are already shown in Fig. 3a. The elevators should be designated with α and b and c .

Each voter has elevator and landing call pickup and reset contacts and brushes, up follow-up call contact and brush switches, direction switches and control surface, and terminus and basement contacts and brushes in a manner similar to that shown in Figures 2a and 2b 2 b for the duplex system is described. In addition, each voter has fixed contacts labeled HUC and cooperating brush switches HUB and HUBA in the upstairs call approach circles and fixed contacts HDC and cooperating brush switches HDB and HDBA in the downstairs call approach circles. The brushes HUBA and HDBA are pre-gripping brushes. A pre- gripping brush UCBA is also provided in the circuit of the control switch UC of each elevator. The corresponding fixed contacts HUC, IiDC and UCC of the selector of each elevator are cross-connected by lines WHU, WHD and WUC.

Assume that all elevators at the terminus, e.g. B. on the first floor. The terminal relay HL of each elevator is then in operation, the relay winding circuit being closed via the brush HLB and the stationary contact HLC assigned to the respective elevator. First, the operation of one, for example the elevator α , will be described. In this case, his emergency switch ESa is closed, the emergency switches ESb and ESc for the other two elevators are open, whereby the switches TGb, TGc, TGXb and TGXc are de-energized. As a result, the circuit for the winding of the start-up switch relay AS is via the contacts LZ? 2 α, FC ι a, TG 3 b and TG 3 c closed. In addition, the elevator selector switch SCa is in operation, for which the winding circuit is closed via the contacts HL 2 a, SC4c and SC 2 b. When the switch SCa is actuated , the contacts SC 2a close and thereby build up a self-holding circuit. By actuating the relay AS and the switch SCa , a circuit for the starting relay FCa is closed via the contacts SCy α and AS ι α. When the relay FCa is actuated , the contacts FC ι a open, whereby the circuit for the winding of the relay AS is interrupted and this relay is made to drop out. The resulting separation of the contacts AS τ α has no effect, since the relay FCa has built up a self-holding circuit via the contacts HL ^ a, SC6α and FC2a.

When the lift α is at the end station, the upstairs call switch HUa is operated, the winding circuit of which is via contacts TD 2, 4 Z) 3, 4 ^ 3. 3-D3, 3 ^ 3. 2 Z) 3 and 2 C / 3, the contact FIUC ι α and the brush arm of the switch FIUBa runs. When storing an upstairs floor call, for example from the fourth floor, the contacts 4 U 3 open and thereby interrupt the circuit for the winding of the switch HUa. This falls and the contacts HU3a close, which on the result of closed doors also closed contacts GW2α a circle is closed. As a result, the switch GWa is actuated because its winding circuit via the elevator door contacts GSa, the contacts Ζτ, α, the contacts FC 8 a, BD 6 α and BSa for the winding of the relay AUa and via these contacts and the contacts LD 5 α for the winding of the relay LUa is closed. When actuated in the manner described for duplex operation, these relays cause the elevator to start up in the upward direction.

If, instead of an upward call, a downward call should be stored for a floor above, for example a downward call on the third floor, the resulting separation of the contacts 3 D3 interrupts the circuit for the winding of the FIUa switch for the purpose of starting the elevator in the upward direction . Now if a passenger enters the elevator and an elevator button, z. B. button CB 4 a, presses, a circuit for the winding of the elevator relay CUPa is closed by the resulting closure of the contacts 4 C 2 α through the winding of the switch CK and the switch FH 4 α and FFITa. When this relay is actuated, the contacts CUP 1 α close a circuit for the windings of the relays AUa and LUa for the purpose of starting the elevator in the upward direction. Since the elevator was assumed to be at rest at the terminus with the doors closed, the passenger must, in order to enter the elevator and press the elevator call, cause the doors to open by pressing the up button UB 1 on this floor. This is via the contacts SC 5 a

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a circuit for the winding of the relay HOa is closed and the door of the elevator a is opened in the manner described for duplex operation. The closing of the contacts GH ι α and DZ \ a following the actuation of the relay HOa also causes the previously actuated relay from the first floor to be reset.

If the elevator α is on a floor above the end station, for example on the top floor, then it is set in motion downwards when a call is stored for a floor below. In the event of an elevator call, this is done by actuating the downward elevator relay CDBa. If, as assumed, an elevator call is stored for the third floor, then the circuit for the winding of the relay CDNa is closed via the contacts 3 C 2 (2, switch FH ^ a, the brush arm of the switch FH4a and the lower section of the control curve FDCa switch cDNA closes contacts CDN ι α and thereby via the contacts AU6a and AU8a a circuit for the coil of the relay BDa and these contacts and the contacts LU 5 α a circuit for the coil of the relay LDa. pressing this relay is the elevator If, instead of an elevator call, an upstairs floor call is stored for a floor below, e.g. the third, the elevator is started in the downward direction by controlling the switch UCa is on the top floor, the circuit for the winding of the switch UCa via the contacts 2 U 2, 3 U 2 and 4 U 2, the place fixed contact UCCTa and the brush arm of switch UCBa closed. When the upstairs floor call is stored from the third floor, the contacts 3 U 2 are opened and the circuit for the winding of the switch UCa is thereby interrupted. This switch drops out, whereby the contacts UC 5 a close and in the manner described above via the contacts G Wj, a, Z 4 α and FCg α and the contacts AU6a a circuit for the, windings of the relays BDa and LDa close. If, instead of an upward landing call, a downward landing call has been stored, the elevator is set in motion downwards by controlling the downward landing call s switch HDa. When the elevator is on the top floor, a circuit for the winding of the switch HDa is closed via the contacts 2 D 2, 3U2 and 4 D 2, the stationary contact HDCTa and the brush arm of the switch HDBa. When a downward call is saved, for example from the third floor, the opening of the contacts 3 D 2 causes the circuit for the winding of the switch HDa to be interrupted, causing it to fail, the contacts HD 3 α to close and a circuit for the windings of the relay BDa xmaLDa is closed to start the elevator in the downward direction. During the elevator movement, the switches HUa, UC and HDa are kept in operation, namely switch HUa through the contacts HU4a to a call for an overlying, and switch UC through the contacts UC4a, to a. Call for a floor below is stored, while switch HDa is operated in a similar manner by contacts HD 4 α . Depending on whether relay LUa or LDa is actuated, either the contacts LU4a or LD 6 α are closed and the relay LUDa is actuated, which can maintain the set direction of travel via its contacts L UD τα and LUD 3 a until the elevator is in the direction of travel Way has ended.

The elevator is stopped on the basis of elevator and landing calls in the manner described for duplex operation and is therefore not discussed again. However, when stopping when driving upwards due to a downward call, the directional circle is interrupted by the fact that the circuit for the winding of the switch HUa is closed by touching the forward brush, switch HUBAa and the associated stationary contact for the floor with, downward call storage. In the same way, when driving downwards due to an upward call, the directional circle is interrupted by the fact that the circuit for the winding of the switch UCa is closed by touching the forward brush switch UCBAa and the associated stationary contact for the floor with upward call storage.

The following is a description of the operation with three elevators, in which the emergency stop switches ES of all elevators are closed. It is assumed that all three elevators at the terminus should be at rest, and elevator α should be preselected and set in an upward movement for the purpose of answering the call. As soon as he leaves the first floor J and the brush HLBa expires from the contact HLCa , the terminal relay HLa drops out, creating a circuit for the winding of the preselector switch SCb for elevator b via the contacts HL 1 b, HL1 a, SC ι α and SC1 c is closed. When the switch SCb is actuated , the contacts SCib close to establish a self-holding circuit, and then the contacts SC2b open, as a result of which the circuit for the winding of the switch SCa is interrupted. In this way, switch SCb is actuated and thereby selects elevator b as the one that is used to support elevator a when there is an operational request.

When the elevator α leaves the first floor, the contacts HL 5 a open, but the winding circuit for the switch FCa remains closed via the contacts LU2a and BA ι α . In addition, the contacts HL 6 α close and thereby build a further circuit for the winding, the switch FCa via the contacts FCi, b and FC4c , which keeps this switch _: FCa switched on for so long regardless of the direction of travel and travel or the rest position of the elevator α when elevators b and c stay at the terminus. So elevator a serves as an occupied elevator and stays behind

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Answering all calls on the floor where he last stopped. Elevator b is put into operation on the basis of an elevator call, a landing call behind elevator a, a continuous landing call storage for elevator a or an automatic drive-by operation for elevator α . Operation based on an elevator call is known from an earlier description. Pressing the upstairs button UB ι at the end station to gain access to an elevator causes the doors of the selected, in the present case, elevator b to open, because the contacts SC 5 b are closed.

Regarding the operation when a trailing landing call is stored, it is assumed that the elevator α is set to travel upwards, is located above the third floor and an up call is stored for the third floor. The resulting opening of the contacts 3 U 2 causes the switch UCa to drop out as soon as either switch UCBa or UCBAa touches a stationary contact located above the contacts 3 U 2. Then, the switch UCA closes contacts UC 2 a, whereby through contacts and TGX2α LU 3 α .a circuit for the Wick development of Nachlaufruf switch CBHA closed is. When this switch CBHa is actuated , the contacts CBH 1 a separate, the winding circuit for switch TGa opens, this switch TGa drops out, and the contacts TG 3 α close and thereby close via the contacts LD 2 b, FC ι b, LD 2 c and FC 1 c a circuit for the winding of the relay AS. When this relay AS is actuated, the contacts AS 1 b close a circuit for the winding of the relay FCb, when actuated a self-holding circuit is established and the circuit for the winding of the relay AS is interrupted in the manner described for elevator α. As one or more landing calls for above the elevator b lying floors be stored, the switch hub is de-energized, and the contacts HU 3 b are closed. Therefore, the closing of the contacts FC S b when the relay FCb is actuated closes a circuit for the windings of the relays AUb and LUb , as a result of which the elevator b is set in motion upwards.

Since the contacts FC 3 b are now separated, the winding circuit for the relay FCa is maintained during the setting of the elevator α to travel upwards via the contacts LU 2a and BAx α . Similarly, with separate contacts .FC 4 α, the winding circuit is maintained during the setting of the elevator b to travel upwards via the contacts LU 2 b and BA ib . When the elevator b leaves the main floor, the relay HLb drops out, and the contacts HL ^ b close a circuit for the winding of the preselector switch SCc for the elevator c via the contacts HL2c, HL2b, SC 3 b and SC 3 α. This switch SCc builds a self-holding circuit when actuated and interrupts the winding circuit for the switch SCb in the manner described for elevator α.

If the elevator b is assumed to be at rest at the end station and is preselected, it is put into operation either by an upward or by a downward call from a floor above the elevator α set for upward travel. It is assumed that elevator α is below the fourth floor and that a landing call is stored for this floor. Depending on whether the call is an upward or downward call, the contacts 4 [/ 3 or 4 D 3 separate and cause either the switch HUBa or the switch HUBAa to drop with a stationary contact for a floor below Switch HUa, which then closes the contacts HU2α and the winding circuit for the switch CBHa via the contacts TGX2a and LD 4a. The switch CBHa works in the manner described above and sets the relay AS and also the relay FCb in action. Since the contacts HU 3 b are now closed because a call is stored above the elevator b , a circuit for the windings of the relays AUb and LUb is established by closing the contacts FC 8 b , so that the elevator b is set in motion upwards .

If the elevator b is preselected at the end station at rest, then it is not put into operation by storing an up call below the elevator α set for downward travel, since this call can be answered by the elevator α on its downward journey. However, if a call has been stored for a floor that is below the floor with a stored up call, then the switch HUa fails as soon as it is established that the elevator α cannot answer this call as a result of another call below, ie as soon as the elevator α passes the floor with the stored call. This actuates the switch CBa and causes elevator b to move away from the terminus.

It is now assumed that both elevators a and b are occupied and set to the upward direction, that elevator c is at rest and is preselected at the end station and that an up call is stored for a floor below the elevator α , the elevator α being higher than the elevator b may be standing. If this up call is not also below elevator b , elevator c will not be set in motion, since switch UCb remains in operation and there is no winding circuit for switch CBHb. The contacts CBH1 b therefore remain closed, as a result of which the switch TGb is actuated and no winding relay for the relay AS is closed. However, if the up call is located under both elevators α and b , both switches UCa and UCb fail in the manner described earlier. As a result, both switches CBHa and CBHb are actuated and furthermore switches TGa and

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TGb dropped . The contacts TG 3 α and TG 3 b now close, as a result of which a circuit for the winding of the relay AS is closed via the contacts LD 2 c and FC 1 c. By actuating the relay AS , the relay FCc is actuated in the manner described for the elevators α and b , which closes the contacts FC 8 c and a circuit for the winding of the relays AUc and LUc because the contacts HU 3 c as a result of the Rtiflage above elevator c are closed. As a result, elevator c is set in motion upward to support the two elevators α and b.

It is now assumed that the two elevators α and b are set for downward travel, that elevator c is at rest and is preselected at the end station and that either an upward or a downward call is also stored for a floor above the two elevators. As a result, both switches HUa and HUb drop out, the two switches CBHa and CBHb are actuated and the winding circuits for the two switches TGa and TGb are interrupted, whereby over. the contacts LD 2 c and FC 1 c, the winding circuit for the relay AS is closed and the elevator c is put into operation to support the elevators α and b. If a down call is stored above one, for example elevator a, but below the other, i.e. elevator b, elevator c is not put into operation, since switch HUa, but not switch HUb, drops due to the call situation behind elevator α , because the call is in front of elevator b . Although a circuit for the winding of the switch CBHa is therefore closed via the contacts HU 2 α , this is not the case for the winding of the switch CBHb , since the contacts HU 2 b remain open. As a result, the contacts CjBH ι b remain closed, the switch TGb remains in operation and thereby prevents the closure of a circuit for the winding of the relay MS, so that elevator c is not set in motion. Instead, the call from elevator b is answered on its descent. If in the latter example the call is not a downward but an upward call, as will be described later, the elevator c is set in motion if the elevator b is on its way back to the end station. If the elevator b is not on such a journey, the elevator c is set in motion as soon as the elevator b passes the call.

Without a detailed explanation it is undoubtedly understandable that when one, for example the elevator α, is set to go down and the other, that is, elevator b, is set to go up and a call down is registered for a floor above, this call does not move elevator c because it is in front of elevator b . Likewise, an up call lying above elevator α cannot set elevator c in motion if it is also above elevator b because it is then in front of elevator b . However, an up call located above elevator α but below elevator b can put elevator c into operation because it is behind both elevators. This is achieved in that both the switch HUa and the switch HCb are caused to drop out, of which the former, HUa, closes the contacts HU 2 α and actuates the switch CBHa , while the second, UCb, the contacts. UC 2 b closes and the switch CBHb is actuated. An up call located under both elevators can also set elevator c in motion in a manner described later.

It is now assumed that elevator α is a quiescent, free elevator on any floor above the terminus, that both elevators b and c are idle terminus elevators, that elevator b is preselected and that it is due to the actuation of an elevator button is in operation for the higher floor. In this case the relay FCb is actuated in that the contacts LU 2b close after the elevator has started moving upwards. As a result, the contacts FC ^ b separate and interrupt the circuit for the winding of the relay FCa, since under the assumed conditions the contacts S 4 a, HL 5 a, LU 2 a, - RC 4 α and AS ι α are all open. As a result, the relay FCa drops and causes the contacts FC 7 α to close, whereby the winding of the switch HLRa, switch FH ι α and the corresponding switches for floors above and the via the contacts Z2 a, GW ι a, CK 1 a lower section. the control curve FDCa a circle for the winding of the relay CDNa is formed. This closes the contacts CDN1 α and thus a circle for the windings of the Re-. lais BDa and LDa, whereby the elevator α is set in motion downwards. The winding circuit formed in this way for the relay CDNa is the circuit for automatic end station return for elevator α and causes its return for the purpose of replacing the now occupied elevator b. After the departure of elevator b , elevator c is preselected as the next outgoing elevator in the manner described above.

It is now assumed that the elevators b '. and c stand at rest at the end of the line and that a passenger enters the elevator α and presses the elevator button CB ι α for the first floor. As a result, the elevator α is brought to travel to the terminus. As soon as it arrives there, both the contacts HL 6 α and SC 6 a open, causing the relay FCa to drop out and the contacts FC ι α and thereby closing a winding circuit for the relay AS. When pressed, this closes the contacts AS 1 b and, provided that the elevator b is the preselected. Elevator is, the winding circuit of the relay FCb. This relay comes into action and makes elevator b a free and elevator α a terminal elevator.

It should be noted that if there are two or more Upward travel set and in operation

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Union elevators, the first elevator that loses its upward setting causes the relay FC assigned to it to drop out due to the separation of the contacts LU 2 assigned to it. This relay closes the contacts FC 7 and thereby the end station return circuit for this elevator. If, for example, only two elevators, assuming elevators α and b, remain in operation, both are set for upward travel and only one floor call above both elevators remains to be answered, then the one answering the call, for example elevator α, causes the contact LU to separate 2, a the dropout of the relay FCa. As a result of the resetting of the floor relay during the automatic call cancellation, the relay LUb also drops out and causes elevator b to stop on the next floor. The separation of the contacts LU 2 b does not let the relay FCb drop out because its circuit is now closed via the contacts FC3 c, FC4a and HL6b . If, however, a passenger enters the elevator α and presses a button for a floor above, the relay LUa is actuated again and causes the relay FCa to be actuated again by the closing of the contacts LU 2 α . The latter opens the contacts FC 4 α-, whereby the winding circuit for the relay FCb is interrupted with regard to the open contacts LU 2 b. As a result, the relay FCb drops out and the contacts FC 7 & close, woduixh the circuit for automatic end station return for elevator b is established. However, when the presses an elevator button for an underlying floor in the elevator a entering the passenger, the relay LUA is not operated, so that α after the waiting time after the door closing the circuit for automatic start of said end station returns for elevator via the contacts Z 2 a, GWi α and FCy a is closed. As a result, elevator b remains on the floor where it stopped and becomes a vacant elevator.

If an elevator call is stored for a floor between the elevator and the end station while the elevator is automatically returning to its end station, the elevator is stopped by touching the brush DCS assigned to it with the corresponding floor contact CP on this floor. After the passenger has been processed and the waiting time has expired, the elevator automatically starts its return journey to the terminus. Likewise, if a downstairs floor call is saved for a floor between the elevator and the terminus, the elevator is stopped by touching the brush DHS assigned to it with the corresponding floor contact DP on this floor and automatically resumes its journey after the waiting time has elapsed.

If an elevator, for example c, is at the end station at a time when another elevator, for example b, is automatically returning to the end station, then the storage of a call behind the third, i.e. elevator α, does not interrupt the end station return circuit of the elevator b. If such a call is a down call located under elevator b , it will be picked up by elevator b on its downward journey. If it is an upward or downward call above elevator b , elevator c is put into operation. The same is the case in the case of an up call lying under elevator b , because the contacts IiLR2b close as a result of the actuation of the end station return switch HLRb ₁ whose winding is in the end station return circuit of elevator b. As a result, the contacts UC 2 b and the winding circuit for the switch CBHb are closed when an outward call is stored under the elevator b , whereby the elevator c is set in motion in the manner described above. In a corresponding manner, in an earlier example in which elevator α on downlink and elevator b set to upward travel and are a lying under both elevators up call is stored, elevator c put into operation because via the contacts LU 3 b and UC2b a circle for the winding of the switch CBHb and via the contacts HLR 2 α and UC 2 a, a circuit for the winding of the switch CBHa is closed.

It is assumed that all three elevators are in operation, one of which, for example elevator a, is on its way back to the end station, and that a call behind the other two elevators is stored. As explained above, this call causes the elevator α to stop on its descent if it is a down call for a floor below the elevator. However, if the call is an upward or downward call above elevator α , assuming that no elevator call is stored in elevator a for a floor below and neither an upward nor downward floor call is stored below that elevator, it becomes the end station return circuit Interrupted for elevator α , the elevator on the next floor stopped and set in motion upwards to answer the call. This is accomplished by controlling the elevator reversing switch RCa . Since the call is behind both elevators b and c , both switches CBHb and CBHc are actuated, causing both switches TGb and TGc to drop out and contacts TG 1 b and TG 1 c to be closed. Since neither an upward nor a downward call is stored below the elevator a- , both switches UCa and FIDa are in operation and the contacts UC 1 α and HD τ a are closed. As a result, a circuit for the winding of the switch RCa is closed via the contacts TG ib, TGic, HLR 1 a, UC 1 a, FID ia, RC 1 b, RC ι c, TX ι α and TGX ι α. The switch RCa closes the contacts RC 4 α and puts the switch FCa into operation, which in turn controls the

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clocks FC ¹ J α separates and opens the terminal return circuit for elevator α. Therefore, if there is no elevator call in elevator α for a floor below, the winding circuit for relay CDNa is interrupted and the elevator on the next floor is stopped. In addition, as a result of the closed contacts FC 8 α, the elevator is set in motion upwards after the waiting time has elapsed. In addition, the switch RCa closes

ίο the contacts RC ι α for the purpose of setting up a self-holding circuit and separates the contacts RC 2 α and RC'si in order to prevent actuation of the switches RCb and RC c. The hold circuit depends on the contacts P ja and SX 2 α in order to secure time to build another circuit for the winding of the switch FC α via the contacts LU2 α before the contacts RC 4 »separate. If there are two elevators, for example α and b, on the way back to the end station and behind the

ao chair c a call is stored under conditions where there is no call under any of the elevators α and b , then separates the first effective switch RC, z. B. RCa, the contacts RC 2 a and thus prevents the actuation of the switch RCb. As a result, the terminal return circuit is broken only at one elevator. The preselected elevator at the terminus responds to floor calls from the basement. If, for example, elevator α is the preselected elevator at the end station, then its contacts SC 8 α are closed. Then, by pressing the button takes place during closing of the contacts UBB BU2 α via the contacts Z2a, GWτα, BA2b and BA is c a circuit for the coil of the relay 3 is closed cDNA, is set whereby the elevator down in movement. The contacts LUD2a receive the directional setting both when the basement is in operation and when it automatically returns to the end station.

After starting up, the contacts LD 3 a close a momentary circuit for the winding of the basement switch BAa. This is actuated and its shutdown is delayed by the discharge of the capacitor CO 3 α after the brush HLBa has left the contacts HLCa in order to separate the contacts HL 3 α and thereby open the contacts BA 2 α and B At, α and to prevent the creation of a basement circle for each of the other two elevators.

If one of the other two elevators on pressing the knob UBB stood in the basement, in the case of the elevator then prevent the contacts b BA 2 b or in the case of the elevator c contacts BA 3 c the construction of a cellar circuit for the elevator a. Instead, the relay HO is actuated for the elevator in the basement, thereby opening the doors of this elevator. If the elevator α drives to the basement under the aforementioned assumption, another one, for example elevator b, is preselected to the end station, with a circle for the winding of the via the contacts HL 1 b, HL1 a, SC ι α and SC 1 c Switch SCb is established. When actuated, the switch SCb allows elevator a to change its preselection in the manner described earlier. ^;

If a passenger enters an elevator, for example elevator a, in the basement and presses the elevator button for the first floor, then, as has been described for duplex operation, the relay FCa is due to the delay in the dropping of the switch BAa and the closing of the contacts BA ι α not actuated and consequently the free elevator is not returned to the terminus. However, if the elevator button is pressed for a floor above the terminus, the contacts BA 1 a close and build a circuit for the winding of the relay FCa after the elevator has passed the first floor. Therefore, when the elevator is idle, the resulting separation of the contacts FC 3 α or FC4a, depending on whether elevator b or c is the free elevator, causes an interruption of the winding circuit for the relay FC of this free elevator, whereby it returns to the end station . If two elevators, for example elevator & and c, are out of service, i.e. their emergency switches ES are open, then switches TGXb and TGXc fail and contacts TGX 3 & and TGX4c close. These contacts bridge the contacts BA2b, BAt, c and SCSa and let the elevator α operate the basement as in simplex operation. . '.

When a floor button is pressed at the end station, no free elevator is returned there, because neither relay 1 U nor relay 1 D have contacts in the circuits that control switches UC and HD. However, if one, for example elevator a, is on its own way back to the end station and a call is stored behind the other two elevators, then its end station return trip is not interrupted if a floor call is stored for the end station because the winding circuit for the relay CDNa is maintained in the event of an interruption of the circuit for the automatic end station return as a result of the separation of the contacts FC 7 α either via contact τ U 2 α or 1 D 3 α . In the same. The contacts BU2a act to maintain the circuit when a floor call is stored in the basement.

If there is a continuous landing call storage for a certain period of time before the occupied elevator, the preselected end station elevator is set in motion to support the occupied elevator. This is done by controlling the switch XT and the relay TT for the individual elevators. It is assumed that the circuit breaker CU1 1 is open for each ferry chair and that the elevator α is occupied and is set to travel upwards. The storage of both an upward and downward floor call via the elevator α causes the switch HUa, which separates the contacts HU ι α , to drop out. Similarly,

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if a downstairs call is stored under the elevator α, the switch HDa falls off and the contacts HD 2 a are disconnected accordingly . When the elevator is set to go down, the contacts HUi a are bridged by the contacts BD 5 α , and as a result, the separation of the contacts HU 1 a during the upward journey or the separation of the contacts HD 2 α prepares a call in front of the elevator α

ίο before. The separation of both the contacts HUi a during the upward travel and the contacts HD 2 a interrupts the winding circuit for the forward call switch XTTa. Since elevator α is the occupied elevator and is not at the end station, its contacts FC ζ α and HLy α are open, so that when switch XTTa falls, the separation of contacts XTT 2 α interrupts the winding circuit of the transmission delay relay TTa , which only occurs after a A certain time of, for example, 30 seconds as a result of the delay caused by the discharge of the capacitor CO 2 a drops. Therefore, if the winding circuit for the switch XTTa and thus the winding circuit for the relay TTa is kept open during this time as a result of the separation of the contacts HU 1a or HD2a or both, the relay TTa drops out. The switches HUa and HDa can be kept currentless by different calls, as long as they overlap.

The continued for a certain time before the elevator call storage α caused the fall of the relay TTa, a separation of the contacts TT ι α and the interruption of the winding circuitry for the switch TGa. This switch 7 "Ga drops out, whereby the contacts TG 3 α and via the contacts LD 2 b, FCib, LD 2 c and FC ic close a circuit for the winding of the relay AS . If, according to the assumption, elevator b is the preselected elevator, then causes the closing of the contacts AS ι b , which takes place when the relay AS is actuated, to close a circuit for the winding of the relay FCb via the contacts SC 7 b, whereby the elevator b is put into operation in the manner described earlier to support the elevator a.

It should be noted that under the assumed conditions where elevator α is the occupied elevator and elevators b and c are at the end station, the stored landing calls are not able to control the relays TTb and TTc , since both the contacts FC 5 b and FC 5 c as well as the contacts HL 7 b and HLy c are closed. If, however, the relay FCb is actuated as a result of the release of the relay TTa or any other call condition causing its actuation, the contacts FC 5b open and allow the landing calls to take effect via the switch XTTb for controlling the relay TTb. As a result, when the elevator b starts to support the elevator α , the waiting time caused by the relay TTb cannot begin until the contacts FC 5 & have opened following the start of operation of the elevator b .

The waiting time for relay TTa is also reset by closing the contacts AS 2 α . The switch XTTb is controlled by landing calls in front of elevator b in the manner described for elevator α. If, therefore, there is then a continuous storage of floor calls in front of elevator b and of floor calls in front of elevator α , relays TTa and TTb are made to drop, whereby contacts TG 3 b and TG 3 a are closed and relay AS is actuated and the elevator c is put into operation to support the elevators α and b. As soon as a downward call is stored above the end station, the DHC switch is de-energized. The contacts DHC 2 of this switch and, as soon as the elevator passes the floor for which a down call is saved, its contacts AU 5 for each elevator prevent its switch XTT from being actuated again.

If two elevators, e.g. B. elevator α and b, are in operation and one of them, z. B. Elevator b, is on an automatic return trip to the end station, causes the long-lasting storage of one or more floor calls in front of the elevator α and elevator b a drop in the relays TTa and TTb. As a result, as described above, the contacts TG 3 a and TG 3 b are closed, the relay AS is actuated and thus the elevator c is put into operation. When all three elevators are in operation and one of them, e.g. B. Elevator a, is on the end station return trip, causes the long-lasting storage of one or more floor calls in front of the two elevators b and c a dropping of the relays TTb and TTc and thus the switches TGb and TGc. As a result, the contacts TG 1 b and TG 1 c are closed, whereby in the event that neither an upward nor a downward call is stored below the elevator α , a circuit for the winding of the switch RCa is closed in the manner described earlier. Switch RCa closes contacts RC4a, actuating switch FCa and breaking the terminal return circuit for elevator α . If there is no elevator call in elevator α for a floor below, then the winding circuit for the relay CDNa is interrupted, the elevator on the next floor is stopped and, after the waiting time has elapsed, it is started up again to support elevators b and c.

If an occupied elevator is loaded up to a certain capacity, then its pass switch BP is operated in the manner described for duplex operation. It is assumed that the pass switch BPa for elevator α has been actuated when elevators b and c are at the terminus. If one or more calls in front of the elevator α are saved and the contacts XTT1 α are open,

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then the separation of the contacts BP 4α caused by / the actuation of the switch BPa interrupts the circuit for the winding of the switch TGa, which fails and closes the contacts TG 3a, causing the preselected elevator to be started up away from the terminus. If only one, e.g. B. the elevator c remains at the end station, then causes the actuation of the λ / override switch for the elevators α and b, if calls are stored in front of both elevators, the dropping of switches TGa and TGb and thus the operation of elevator c. When all three elevators are in operation and one of them, e.g. B. Elevator a, is on an automatic end-station return trip, then causes the operation of the pass switch for the elevators b and c, if there are calls ahead of them, the dropping of the switches TGb and TGc and the closing of the contacts TG 1 b and TG ι c. Therefore, if neither an upward nor a downward call is stored below the elevator α , then a circuit is closed for the winding of the switch RCa. This switch is operated in the manner described earlier and causes the interruption of the end station return circuit for elevator a, so that if there is no elevator call in elevator α for a floor below, the elevator on the next floor is stopped and back up to support elevators b and c is put into operation.

Up to now, the operation of the elevators with "triplex" control has been described for cases in which a call was stored behind one or more elevators or calls were continuously stored in front of one or more elevators or where one or more elevators were in drive-by mode . If two elevators are in operation, the activation of the third elevator away from the terminus to support the other elevators can also be brought about by a coincidence of these conditions. It is assumed, for example, that elevators a and b are in operation and elevator c is at the terminus and that a call is stored behind elevator α. If this call is not also behind elevator b , it does not cause elevator c to start up by dropping the switch CHBb. However, if there is a permanent storage of a call or several overlapping calls in front of elevator b , then elevator c is put into operation in conjunction with the call behind elevator α.

This is done by separating the contacts CBH ι α associated with the fall of the switch TGa and the separation of the contacts TT1 b associated with the fall of the switch TGb. Likewise, when the elevator chair b drives past, when the call behind elevator α is in front of elevator b , elevator c is put into operation in cooperation with the call behind elevator α. This happens as a result of the separation of the contacts BP4b and XTT ι b connected with the dropping of the switch TGb in cooperation with the above-described dropping of the switch TGa. In a similar AVeise, the coincidence of a pass-by operation for elevator b and a call in front of it in conjunction with a continuous storage of a call or several overlapping calls in front of elevator α causes elevator c to start up. It can therefore be seen that the coincidence of one of the following conditions: a call behind an elevator, a pass-by for an elevator with a call in front of it, or the storage of a call or several overlapping calls from such an elevator for a certain period of time one of the following conditions: a call behind another elevator, a drive past for this other elevator with a call in front of it or the long-term storage of a call or several overlapping calls in front of this other elevator, a third elevator from the Terminates in operation. Likewise, each of these types of meetings interrupts the return journey of the third elevator to the terminus if there is no call for a floor below the third elevator.

The system can be set up to operate without follow-up call, continuous call storage, or pass-by control. The pass-by control can be switched off for each elevator by closing the switch CUio, the continuous call storage by closing the switch CU 11 and the follow-up call control by closing the switch CU15. When the follow-up control is switched off, the switch XTT of each elevator is preferably subjected to every floor call in front of or behind the elevator. This can be done by opening the switch C [/ 13 and CU 14 for each elevator. By opening the switch CU 13, the elevator-associated contacts HU ι become effective for both directions of travel, while opening the switch CU 14, the elevator-associated contacts UC 3 become effective, so that a lower up call also affects the elevator-associated switch XTT.

The circuits are also set up in such a way that if an elevator does not start operating within a certain period of time when conditions that require it to be put into operation occur, its switch TG drops out, thereby causing another elevator to be put into operation. The occurrence of such start-up conditions is indicated by actuation of either relay AU or relay BD for that elevator. A failure to start an elevator is thus indicated by an operational failure of the switch P associated with the elevator. So if z. B. in the elevator α either relay AUa or relay BDa, but not switch Pa , then interrupts the occurring separation of the con-

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clocks BD 4a or AU4a and in parallel with it the contacts PC / 9 α the winding circuit for relay TXa. This switch does not drop immediately because this is delayed for a while by the discharge of the capacitor CO 7 α. If the circuit remains interrupted during the waiting time, the relay TXa fails , and the contacts TX ι α and TX 2 a open. The contacts TX 2 a cause the switch TGa to drop out, as a result of which another elevator is put into operation in the manner described earlier. The contacts TX ι α prevent the actuation of the switch RCa and thereby the possibility that this switch excludes the PC switches for the other elevators via their contacts RC 2 α and PC 3 α. In the winding circuit of each relay TX, for example the relay TXa, there are contacts GH 2, which cause the relay TXa to drop out if the doors are kept open for the waiting time.

The free elevator does not have to stop on the floor on which a call was made to stop, but can also be made to return to a selected floor, if desired. This is done for every elevator by closing the switch CUg. In the circuits, the third floor was shown as the selected floor by connecting this switch for each elevator to the elevator-associated direction switch FH 3 for the third floor. In the circles for the elevator α, for example, its contacts FC 6 α are closed when the elevator is free. Since no elevator calls from elevator α are stored, its contacts CK 1 α are closed and, since there are no floor calls to be answered by it, the contacts UHC 1 α and DHC 1 α are also closed. As a result, after the waiting time has elapsed and the doors are closed, a circle via the contacts Z 2 a, GWi a, CK ία, FC 6a, UHCi α and DHCi α and the switch CUg a to the direction switch FH 3 a for the third floor and further depending on the position of the elevator below or above the third floor, closed by the winding of either relay CUPa or relay CDNa . The actuation of one of the relays CUPa or CDNa causes the elevator to be started up to the third floor and to stop when it arrives there.

How the system works when applied

on two elevators, as shown in FIGS. 2 a, 2 b and 3 a, or when applied to more than two elevators, as shown in FIGS. 5 a, 5 b, 6 a and 6 b in conjunction with FIG. 3 a is, could by describing the way of working among other things than those previously assumed Conditions are explained further, but a more detailed description should be unnecessary, because these other ways of working from the above are understandable.

On the operation of the control in application to two elevators, as in the Fig. 2 a, 2 b and 3 a is shown, coming back, is from both of the idle elevators one usually as a free elevator on any floor other than the terminus, although both can also be at the end of the line. The landing doors of the floor are at every elevator, on which he stands and his own door closed.

If a floor button is on a floor other than the one where the free elevator is located is pressed, the elevator will move in the direction of the floor with the stored call Movement is set and becomes an occupied elevator. As soon as the elevator in some way Distance from the floor with the stored call arrives, it is slowed down and finally at Arrival stopped at floor level. The elevator door is at the end of the elevator stop and open the landing door of the floor where the car stopped. The waiting passenger steps into the elevator and presses the elevator button for its destination. The doors close and the elevator will begin moving towards the call storage floor set. When you arrive at this floor, the elevator will be brought to a stop and the doors open so that the passenger can exit the elevator.

In case of further calls either through elevator buttons in this elevator or through floor buttons for floors in the direction the elevator is set to be saved, then the elevator stops at each floor for which an elevator call or a floor call in the The direction in which the elevator is set is saved. He continues his journey each stop continues in the same direction until it stops on the farthest floor with call storage. This call can be an elevator call or a landing call in one or the other direction of travel being. Then the elevator can answer calls in the opposite direction Movement can be set. If no calls are stored in the opposite direction: the elevator remains on the floor where he stopped.

The occupied elevator continues answering the stored landing calls until conditions occur that put the other elevator into operation. The commissioning of the end station elevator is made by storing a landing call behind the occupied elevator, which persists for a certain period of time Storage of a landing call or several overlapping landing calls or caused by the occurrence of automatic pass-by for the occupied elevator. This on continuous call responding control arrangement for putting the other elevator into operation can be used alone or in conjunction with one or more others. There is a call behind the vacant elevator immediately puts the end station elevator into operation, speaks with common Use of follow-up call control

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tion and ongoing call storage control, the latter on lying in front of the free elevator Floor calls to. Each elevator answers its own elevator calls, so does the end station elevator can also be put into operation by a passenger who enters the elevator and an elevator call for his destination saves. In any case, the elevator answers when the

ίο terminus away its own elevator calls and supports the other elevator in answering the stored landing calls.

Each elevator can be sent back to her on the basis of an elevator call for the terminus will. If both elevators are in operation, one elevator can also due to a floor inspection be sent back to the terminus for this floor. When both elevators are in operation, one of them is automatically sent back to the end station if conditions permit. However, if there is any condition that requires an elevator from the terminus would start operating, no elevator is sent back to the terminus.

If none of these conditions exist, if an elevator answers its highest call, then the circle is closed for its automatic return to the end station.

If during the automatic end station

30. Returning an elevator any condition occurs causing it to operate away from the terminus would set, then he is prompted to assist without completing his return journey to the terminus of the other elevator if there is no other call for a lower floor that he would answer.

Should the occupied elevator reach the terminus due to an elevator call under certain conditions be sent back where an elevator is already there, then the end station elevator will be to the free and the other elevator to the end station elevator. Should be if present of both elevators at the terminus, a passenger enter the terminus elevator and press the elevator button Press for its destination, the elevator with the stored elevator call becomes the occupied and the other elevator to the end station elevator. Should the vacant elevator be on stand at rest on a floor other than the terminus and a passenger use the terminus elevator enter and press an elevator button, the end station elevator will be in operation and becomes the occupied elevator, while the other elevator returns to the 55 end station is put into operation. The end station elevator also answers a cellar call, but this does not result in the return of the free elevator to the terminus. If a call should be saved, use the free elevator could answer, but this should not start up within a certain time, then the end station elevator is put into operation to answer this call.

When using the control on more than two elevators, as shown in FIGS. 5 a, 5 b, 6 a and 6 b is shown in connection with Fig. 3a, occurs practically the same operation and is only in certain Relationships changed to accommodate multiple elevators. If all elevators are at rest, then one elevator is open as a free elevator any floor other than the terminus, and the other elevators are on the terminus.

If a floor call is stored, it will be answered by the vacant elevator. The elevator continues answering the stored landing calls as long as none have an end. There is a condition that puts the station elevator into operation. If one or more elevators are on End station, one is preselected as the next one, and one when one occurs End station elevator has to respond to the condition setting it into operation. Storing a The landing call behind the occupied elevator causes the preselected elevator to be activated Elevator at the terminus. The commissioning of this preselected end station elevator is also carried out by the permanent storage of a landing call for a certain period of time or several overlapping landing calls in front of the occupied elevator or - the action of the automatic pass-by for the occupied elevator in the case of one in front of the occupied elevator caused lying, stored landing call. If two elevators are in operation, the Preselected end station elevator put into operation if one of the conditions for one elevator is present, through which an end station elevator is in operation when this elevator is operated alone would be set, namely z. B. a call behind the elevator, a continuous call storage in front of him or driving past him with a call ahead, and at the same time one of these conditions also applies to the other elevator. As with the This control arrangement, which responds to continuous calls, can be used in duplex operation for commissioning an end station elevator alone or in conjunction with one or more other no be used. A terminal elevator can also be put into operation on the basis of an elevator call will. In any case, an elevator answers away from the terminus after it has been put into operation its own elevator calls and supports one or more elevators in answering stored calls Floor calls.

Every elevator that is in operation is saved with its own elevator call for this floor returned to the terminus. If two or more elevators are in Are in operation, all but one are automatically returned to the end station if the conditions allow it allow. When an elevator reaches its highest reputation, the circle becomes for its own automatic end station return closed,

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if another elevator is in operation and not on the way back to the terminus. If only two If elevators are in operation, the elevator with a closed end station return circuit is used End station sent back and, if necessary, the third elevator to support the other Elevator put into operation. If all the elevators are in operation, then an elevator will be activated as soon as he makes his own return trip to the end of the line

ίο has started causing its travel in the downward direction to continue as long as a floor or a separate elevator call for a lower one Floor is available. But if there is no such floor call, then the circle is for Automatic end station return interrupted under conditions under which it was used as a end station elevator would be put into operation, d. H. where in relation to any other in operation Elevator a subsequent call or a permanent storage of a call or itself overlapping calls in front of him or an automatic drive by for him along with the preceding one, stored call.

If an occupied elevator is due to an elevator call to. Terminus should return, where the other two are already, the preselected end station elevator becomes a free and the previously occupied elevator to the end station elevator. If the free elevator is on another On the first floor when the terminus is at rest, a passenger uses the preselected terminus elevator should enter and press an elevator button, then the end station elevator will be in operation set and to the occupied elevator, while the previously vacant elevator is on the way back to Terminus is sent. The preselected end station elevator also answers a cellar call, but this does not cause the free elevator to return to the terminus. If a Call should be saved that the free elevator could answer, but not itself Should be put into operation within a certain time, then the preselected end station elevator put into operation to answer this call.

Those described above only in connection with a duplex and triplex system The invention can of course also be used in arrangements with more than three elevators. The invention is also not only, as described, in arrangements with a basement, but can also be used for those with more than one or no basement. Many of the inventive features described are also special in connection with others than that described arrangements and circuits and also in connection with other types of elevator control usable. For example, the elevator motor control can be changed by for example a direct current motor powered by a direct current generator with variable voltage is used. The power flow can either come from a direct current or an alternating current main network can be removed. The control described is very extensive and allows many changes without departing from the spirit and scope of the invention.

Claims (13)

PATENT CLAIMS: 1. Collective elevator control for several elevators under the common influence of landing call storage means, of which at least one is started by the first, stored landing call, characterized by electrical control elements, e.g. B. Waiting relays (TT), which only after a specified period in which further floor calls are not answered by the first started elevator (a) or the already started elevators (a, b , etc.), the starting of an additional drive chair (z) to support answering by influencing its starting equipment, z. B. Start-up switch (TG, AS), trigger. 2. Control according to claim 1, characterized in that in the excitation circuit of the electrical control element (TT) one of the first, stored landing call switchable separation point, z. B. working contacts of the landing call relay (HC), and a delay element, z. B. Discharge capacitor (CO) are present. 3. Controller according to claim 1 or 2 with automatically preventing the answering, z. B. of load- sensitive switches (MCCa) operated pass-by switches (BP), characterized in that 'the Anfahrschalteir (TG ₁ AS) for sending an additional elevator (z) can also be influenced by the, Voirbeifahrscbaltem. 4. Control according to one of the preceding claims 1 to 3, characterized by such a design of the control elements that the dispatch of an additional elevator (z) triggering, further floor calls seen in the direction of travel in front of the first started elevator (a) or the already started elevators ( a, b etc.) 5. Control according to one of the preceding claims 1 to 4, characterized in that electrical controls, for. B. Follow-up call switch (CBH) are provided, which are only controlled by - viewed in the respective direction of travel - behind the first started elevator (a) or the already started elevators (a, b , etc.) and the start of a Additional elevator (z) to support answering by acting on its starting means, z. B. Start-up switch (TG, AS), can trigger. 6. The controller of claim 5, characterized in that the run-call switch (CBH) can be controlled only by such calls that for each position of the elevator erstgestarteten (a) or the already started s (a, b, etc.) a have a fixed order according to the amount. 609 737/151 O 1820 XI / 35 a 7. Control according to claim 5 or 6, characterized in that the follow- up call switch (CBH) by an up call below each lift already started up for answering calls (α or α, b etc.) or on an up call or a down call above each lift (α or α, b) already started for answering the call downwards. 8. Control according to one of the preceding Claims in which the call storage means is for each floor from the associated floor can be controlled from and with the exception of a free elevator all other end station elevators are, characterized in that the starting switch of the free elevator through the first stored call can be activated. 9. Control according to claim 8, characterized by electrical controls, for. B. Preselection switch (^ C) to select the one of the elevators that have not started and that should serve as the next additional elevator. 10. Control according to claim 8 or 9, in which normally all elevators except for one are returned to the end station and controls, for. B. reversing switch, are available to interrupt the return journey of an elevator to the terminus when the end station is empty, characterized in that the reversing switch (TG, RC) under the influence of the waiting relay (TT) operate if the latter respond after the start of all elevators because a call was not answered within a certain time. 11. Control according to claims 3 and 10, characterized in that the travel reversing switch (TG, RC) are also brought into position dependence of the pass-by switches {BP) . 12. Control according to claim 10 or 11, characterized by electrical control means, eg working contacts of floor call relays (U, D or UC, HD), in the control circuit for the automatic end station return of an elevator to the elevator by a floor call in front of it in the direction of travel to keep it in operation in this direction of travel until it has answered this call. 13. Control according to one of claims 10 to 12, characterized by such a dependency in the control circuit that an already At the terminus, the elevator interrupts the return of another Prevents the elevator to the terminus. In addition 7 sheets of drawings © 609 737/151 12.55