US2182657A

US2182657A - Elevator

Info

Publication number: US2182657A
Application number: US180956A
Authority: US
Inventors: Charles F Carney
Original assignee: Westinghouse Electric Elevator Co
Current assignee: Westinghouse Electric Elevator Co
Priority date: 1937-12-21
Filing date: 1937-12-21
Publication date: 1939-12-05
Anticipated expiration: 1956-12-05

Description

Dec. 5, 1939. c CARNEY 2,182,657

ELEVATOR 2 Sheets-Sheet 1 Filed Dec. 21, 1937 g WW W v {17L I Q:

Canzacts Lu! 0f Safely Devices INVENTOR Gharies F Carney.

W% A I'TO EY 2 Sheets-Sheet 2 v, m x m I I I I I l l I I I l Ill I I I l I 18 g q. .fi m x S 3 g U 3 lllllllllll NW :2 2 3 a 5 s neg. TgNEY INVENTOR FT (Jar AIT C. F. CARNEY ELEVATOR Filed Dec. 21, 1937 Giza/Z65 Patented Dec. 5, 1939 Li ht.

Charles F. Carney, Chicago, 111., assignor to Westinghouse Electric Elevator Company, Jersey City, N. J., a corporation of Illinois Application December 21, 1937, Serial No. 180,956

14 Claims.

My invention relates to elevator systems embodying selector mechanisms and more particularly to floor selector mechanisms that are operated through driving connections with the hoisting apparatus of the cars.

This application is a continuation-in-part of my application Serial No. 132,073, filed March 20, 1937, assigned to Westinghouse Electric Elevator Company, and now abandoned.

The floor selectors are provided for connecting the various circuits for the push buttons, floor lanterns, signals, etc. in accordance with the position of the cars. There is a floor selector for each car and it usually comprises a plurality of contact segments arranged in accordance with the positions of the floors and a plurality of cooperating brushes. The brushes are mounted upon a brush arm which is operated to move the brushes over the contact segments in accordance with the movement of the car past the floors it serves. When the brush arm is driven through a direct connection with the hoisting motor or drum, it occasionally gets out of step with the car and fails to correctly engage the contact segments in accordance with the position of the car. That is, when the car is at a floor, the brushes will not be on the contact segments for that floor, but will be off-center and may even be in contact with the segments for some other floor. This failure of correct positioning of the brush arm may occur by reason of creepage of the hoisting cables where the car is operated by friction drive or it may at times occur because of stretching of the hoisting cables. When it does occur, the car 35 fail to stop accurately or to operate its signals correctly and it is necessary to reset the b ush arm to avoid trouble.

The main object of my invention is to provide the automatic resetting of the brush arm of a floor selector whenever it gets out or" step with the car, regardless of whether the car is at its terminals or its operating at floors between the terminals.

Another object is to provide a simple and inexpensive resetting means for floor selectors which shall be easy to construct, install, operate, and maintain in operation.

For a better understanding of the invention, reference may be had to the accompanying drawi. as, in which:

pl ura 1 is a diagrammatic representation of an ElE'v'all system embodying my invention, the control circuits being drawn in what is known as the straight-line style; and

Fig. 2 is a key illustration of the relays embodied in Fig. 1.

The illustration of the relays in Fig. 2 shows them with their coils and contact members disposed in horizontal alignment with their positions in the straight-line circuits of Fig. i so that the reader may readily determine the position of the coil and the contact members of any relay in the straight-line circuit. The relays are named as follows:

K=Non-interference relay U=Up direction switch D=Down direction switch UP=Up direction preference relay DP=DoWn direction preference relay G=Starting relay E=Door relay sL=Low-speed line switch H: High-speed line switch RW=Retardation relay HW=High-speed accelerating relay S=Foor stopping relays =Up leveling switch DQ=Down leveling switch UL=Up leveling relay DL=Down leveling relay X=Selector correcting relay.

Although the invention may be utilized in any elevator system embodying a floor selector having a movable arm, it will, for the sake of simplicity, be illustrated and described in connection with a very simple elevator installation such as a lowspeed automatic system operated by a single call button at each floor and a single call button for each floor in the car. In this simple system, the elevator car is operated by the passengers pressing the push buttons at the floors to call the car to them. When the car arrives they open the door, enter the car, close the door and then press the button in the car for the floor to which they desire to travel. Then the car will automatically go to and stop at that floor. Also, in this simple system the passenger who first operates the push button for the car has control of the car until he is through with it, and during the time he has the car, the push buttons for the other floors are rendered ineffective so that no other passenger can interrupt the operation of the car.

Referring more particularly to the drawings, I have illustrated an elevator car it as supported by a cable ll passing over a hoisting drum !2 to a suitable counterweight 53. The hoisting drum is mounted upon a shaft i l disposed to be driven by a high-speed three-phase alternating-current iii motor HM and a low-speed three-phase alternating-current motor LM. An electromagnetic brake it having an energizing coil it is provided for controlling the car when it makes a stop, and a speed reducing gear mechanism 18 is provided to permit the use of high-speed motive means in the operation of the hoisting drum l2. The rotors of the high-speed motor and the low-speed motor are mounted on the shaft l4, and their stator or field windings HMl, I-IM2 and HMS and Li /ll LME and LM3 are illustrated in the wiring diagram. The high speed motor is used for startmg and running the car at normal high speed. The low speed motor is used after the high speed motor is disconnected for retarding the car and moving it into a floor at a landing speed. Other suitable motive means may be utilized, if desired.

An up direction switch U and a down direction switch D are provided for connecting the motors to a source of electric energy represented by the supply conductors LI, L2 and L3 for operating the car in either the up direction or the down direction. These direction switches are controlled by the push buttons in the car and by the push buttons at the floor landings which the car serves. The car buttons are indicated as BC for the basement fioor, IC for the first floor, 2C for the second floor, and 3C for the third floor. The floor buttons are indicated as BF for the basement, IF for the first floor, 2F for the second floor, and 3F for the third floor. It is to be understood that the elevator system may be designed for any suitable number of floors, and that only three fioors and the basement are shown in the present illustration for the sake of simplicity.

A plurality of stopping relays are provided for effecting the stopping of the car at a floor when it is answering a call for that floor. The stopping relay for any floor is energized by the pressing of a button for that floor so that it will stay energized until the car comes to and stops at that floor. The stopping relays are indicated. as BS for the basement, IS for the first floor, 28 for the second fioor, and its for the third floor.

A pair of direction preference relays are provided to be controlled by the floor stopping relays in accordance with the position of the car either above or below the operated floor stopping relay. The up direction preference relay is designated as UP and the down preference relay as DP.

A non-interference relay K is provided to be energized when a push button is pressed by an intending passenger so that no other passenger can secure possession of the car while the first passenger is using it. The relay K is provided with a dash-pot It so that it closes its contact members slowly upon being deenergized when the car reaches its destination. This delayed operation of the relay K permits the passenger in control of the car to have sufficient time for opening or closing the door and to enter or leave the car before the next passenger may take over its control.

A starting relay G is provided for conditioning the control system to start the car when one of the push buttons has been operated to move it to a fioor.

The car may be provided with a suitable door 2t? with which is associated a door relay E. for conditioning the control system for operation when the door is closed and for preventing operation of the car while the door is open.

The stator windings of the high-speed motor are provided with a plurality of resistors TI, 13 and T5 for controlling the acceleration of that motor in starting. The field or stator windings of the low-speed motor are provided with a plurality of resistors T2, T4 and r6 so that the retarding torque of that motor may be increased when it is connected for bringing the car into a floor at a landing speed.

A high-speed accelerating relay I-IW is provided for short circuiting the resistors rl, 1'3 and T5 in the circuit of the field windings of the high-speed motors, and a retardation relay RW is provided for short circuiting the resistors r2, T4 and T6 in the circuit of the low-speed motor.

A high-speed line switch H, controlled by the starting switches, is provided for connecting the field winding of the high-speed motor and for operating the highspeed accelerating relay.

A low-speed line switch SL is provided for connecting the field windings of the low-speed motor and for energizing the retardation relay RW. The relays HW and RW are provided with dash-

pots

22 and 23 so that they will delay closing their contact members for a predetermined period after being energized, thus delaying the short circuiting of the resistors in the circuits of the field windings for the motors for a predetermined period after the motors start, so that they will be cut out of the circuit at the right time.

An up limit switch ULS and a down limit switch DLS of old and well known construction may be provided for limiting movement of the car when it arrives at either the upper or the lower terminal.

The car is provided with a leveling means for causing it to stop level with the floor for which it has answered a call. The floor leveling means comprises an up leveling relay U1 and a down leveling relay DL. The up relay UL is controlled by an up leveling switch UQ and the down relay BL is controlled by a down leveling switch DQ. The up switch UQ is actuated by an up cam U25 and the down switch by a cam D25. A pair of up and down cams should be mounted on the walls of the hatchway (not shown) at each floor. In this installation it will be assumed that the switches are disposed in permanent position on the car and that the low speed of the car permits it to move the switches over the cams every time it passes the floor at which the cams are located. However, if desired, the switches may be so mounted on the car that they may be retracted except when. the car is approaching a floor at which a stop is to be made. However. inasmuch as leveling switches and cams of this nature are old and well known in. the art, it will be assumed that the elevator engineer will select such leveling switches and cams as he deems advisable.

If the car overruns the floor on down trip stop, the up level" switch. will be closed to energize the up leveling relay to operate the up direction switch to bring the car back up the hatch- Way to position level with the floor. On the other hand, if the car underruns the floor on a down trip stop, the down leveling relay will. be energized by the position of the down switch on the down cam to cause the down direction switch to be operated to move the car down level with the floor. Also, the leveling relays are so connected in. the control system that they will hold in the correct direction switch the car approaches a stop until the car reaches the stopping point.

The relays and switches may be provided with energy from a control circuit represented by the conductors L+ l, L4, L+5 and L& connected to the supply conductors Li, L2 and L3 through a suitable rectifier 23. A floor selector FS is provided for connecting the various circuits for the relays, switches, etc., in accordance with the position of the car with reference to the floors it serves. The floor selector comprises a plurality of stationar 1 ccntac segments disposed on a frame or support 2": for the various floors, a constant supply contact strip 28 and a plurality of cooperating brushes 3!), El and 32.

The up contact segments disposed under the up brush are for the up stopping relays and designated as BUA for the basement, IUA for the first floor, 'ZUA for the second floor, and 3UA for the third floor. The down contact segments under the down brush iii are designated as EDA for the third floor, EDA for the second floor, lDA for the first floor, and BDA for the basement. The brush engages contact strip 28 constantly for providing a constant electrical connection between the brushes and El and the supply conductor L i The brushes are illustrated as mounted upon a brush 33 operated by a screw-threaded shaft 3 The screw-threaded shaft moves the arm up and down the floor selector, thereby movthe brushes over the faces of the contact segments for the floors accordance with the operation of the car past the floors. The shaft 34 is operated by a pair of beveled gears 35 and 36 operated by shaft which is connected through a friction clutch 38 to the outer end of the hoisting shaft i l.

At times the brush arm moves to its uppermost or lowermost position, it may not be exactly in step with the position i the car as the car nears the corresponding terminal. In order to cause the brush arm to reset itself or adjust its position. to place it in step with the movement of car, the lower end of the floor selector is provided with a block All and the upper end with a block il. When the brush arm is out of step with the car and reaches the lower block too the block stops its further progress and thus halts the operation of the shaft 3-3, the gears and and the shaft ill by reason of the fact that friction clutch 38 between the shaft and and permits the shaft 3'! to ren in stationary and not operate with the hoist- 52. Likewise, when brush arm rose 31' the upper end of the floor selector corresponding to the upper terminal and it is out of step with the car, so that it is moving ahead of the position it should occupy in accordance with the position of the car, the arm will strike the block All that block will stop it and prevent its further upward movement. This again stops the operation of the bevel gears 35 and 36 and the shaft 31. However, the friction clutch 33 slips and permits the shaft s! to remain stationar while the hoisting drum i2 is rotating. The-refore the car pulls into its terminal and leaves the brush arm in its correct positon on floor selector so that it corresponds accurately with the position of the With this arrangement, the position of the brush arm is corrected every time the car goes to a terminal.

In apartment -ouse elevators, however, the car is usually pa at the first floor. This that the car will be cpercfi'ed usually between first floor and the upper terminal, but will seldom go to the lower terminal in the basement. Hence, if the brush arm gets ahead of the car going up,

ing

it will probably have its position corrected very quickly by the movement of the car when it reaches the upper terminal. However, if the brush arm gets ahead of the car in the down direction, it may be quite awhile before the car makes a trip to the basement and thus cause the brush arm to have its position corrected. This presents some difiiculty in the operation of the car when no attendant is employed to see that the brush arm is always in its correct position for operation.

In order to overcome this difficulty, I have provided a means for causing the car to move to the basement whenever the brush arm gets ahead or the position it should occupy in accordance with the position of the car on a down trip. In practicing my invention, i provide a down correcting contact segment on the floor selector panel and a down correcting brush on the brush arm so disposed that the correcting segment and the correcting brush will not engage when the car stops at the 1st floor with its contact brushes in correct position on their segments, but which will be engaged when the car stops at a floor and the brushes are not on their correct segments but are out of step with the car. The down correcting contact segment is mounted on the down side of the floor selector panel adjacent to the 1st floor position and is designated as XA. Its cooperating correcting brush on the brush arm is designated as If desired, a down resetting contact segment may be provided for each floor and an up correcting segment may provided for one or more floors in the up direction with a cooperating up correcting brush. However, in practice it will usually be found that a sufiicient correcting action will be provided if a correcting contact segment is provided for the down direction on the selector for the floor at which the car parks most of the time. In this case it will be assumed that inasmuch as it is an apartment house elevator, the car will be parked at the first floor most of the time. VIhen the door selector is so out of step with the car on a down trip that the brush arm is in advance of its correct position, the correcting brush 43 will engage the corrooting segment XA and thereby energize the control system to call the car to the basement terminal where the pos tion of the brush arm will be automatically reset.

A better understanding of the invention may be had from an assumed operation of the apparatus illustrated in the drawings.

Assuming that the car is standing at the first floor with its door closed. Inasmuch as the car door as is closed, the gate contact members 50 are closed, thereby energizing the door relay E by the following circuit:

L-l-d, 59, E, L4, at the lower left-hand corner of 1. The energization of the door relay prepares the starting switch G for operation. Hence the car is ready to respond to any call. Assuming that an intending passenger at the second floor presses the button 2F to call the car, the pressing of the button causes the car to move up to and stop at the second floor by energizing the stopping relay 28 by the following circuit:

L+5, Kl, Ell, 30a, 2Ca, lCa, BCa, 2F, 28, 53, 3S2, L 5. The energized relay 28 opens its contact members 28! and 282 and closes its contact members 2S3. The closing of the contact memhere 233 provides a self-holding circuit for the relay. The opening of the contact members 282 provides an interlocking of the circuit for the floor relays which when two or more floor push buttons are pressed simultaneously bywaiting passengers, will permit energization of only the floor relay for the highest floor button operated. It is provided because, in apartment houses, several waiting passengers are likely to keep their fingers on the floor push buttons at the same time in the hope of being the first one to get possession of the car after it is released by the one who already has it.

The opening of the contact members ZSI opens the circuit from the resistor 1'! through contact members 38!, 258, contact segment iUA and brush 3t to the supply conductor L5. The opening of this circuit causes the energy through the current limiting resistor 1''! to flow through the contact members DP! and coil UP to the supply conductor L5, thereby energizing the up direction preference relay UP to cause the car to move upwardly. The energized relay UP closes its contact members UPI, UP3 and UP4 and opens its contact members UPZ and U1 5. The closing of the contact members UP4 energizes the up direction switch U by the following circuit: L-I-4, D6, U, DP4, U1 4, G3, E3, L-4. The energized up direction switch U closes contact members UI, U2, U3 and U4 and opens its contact members U5 and U6. The closing of the contact members U! and U2 prepares the windings of the low-speed motor and the high-speed motor for connection to the supply conductors Ll, L2 and L3. The closing of the contact members U4 energizes the non-interference relay K the circuit: L+4, U4, K, L-4. The energized relay K opens its contact members KI, thereby preventing another intending passenger from taking the car away from the passenger who has called it, by preventing energization of any of the other floor stopping relays. The closing of the contact members U4 also energizes the highspeed line switch H by the circuit: L-ll, U4, El, H, G2, D4, ULS, L-4.

The energized relay H closes its contact members Hi, H2 and H3. The closing of the contact members HI and H2 connects the field windings HM! HM2 and I-IM3 of the high-speed motor to the line conductors Ll, L2 and L3, thereby starting the high-speecl motor HM. The closing of the contact members H3 energizes the high-speed accelerating relay I-IW which, by reason of its dashpot 22, closes its contact members HWi and l-[WZ after the expiration of a predetermined delay, thus short circuiting the resistors r! r3 and 1'5 in the field winding circuit of the high-speed motor and thereby causing the motor to speed up and operate the car at its normal high speed.

In the meantime the car has started to leave the first floor, and the down leveling switch relay BL is temporarily energized by the switch DQ being disposed on the cam, but as the car continues, the switch leaves the cam and again deenergizes the leveling relay DL. However, no action has resulted from the energization of the relay DL because the circuit for the down switch D is open at the contact members UP5.

As the car approaches within decelerating distence of the second floor, the up direction switch UQ engages the cam U25 and thereby energizes the up leveling relay UL which closes its contact members ULl, thereby providing an additional circuit for the up relay U to hold that relay until the car gets to a position level with the second floor. As soon as the up leveling switch is operated by the up leveling cam, the brush 3!] also engages the contact segment 2UA, thereby short circuiting the up direction preference relay UP and deenergizing that relay because the current does not flow through it now, but flows through the following circuit: 11, 3Sl, 55, ZUA, 30, 32, 28, L5.

The deenergized relay UP opens its contact members UP3, thereby deenergizing the starting switch G, which in turn closes its contact members G! and opens its contact members G3, G4 and G5. The opening of the contact members G4 deenergizes the floor stopping relay 2S and restores it to its normal condition. The opening of the contact members G2 deenergizes the highspeed line switch H which opens its contact members Hi, H2 and H3, thus disconnecting the highspeed field windings HMI, I-IMZ and HM3 from the supply circuit, thereby deenergizing the highspeed motor HM. The opening of the contact members H3 also deenergizes the high-speed accelerating relay HW to restore the resistors Tl, T3 and T5 to the circuit of the field of the highspeed motor ready for future operation.

The deenergization of the starting switch G also closes its contact members GI, thus energizing the low-speed line switch SL to close its contact members SLE and SL2, thus connecting the field windings LMl, LMZ and LM3 of the low-speed motor to the supply conductors Ll, L2 and L3, thereby energizing the low-speed motor LM and starting it in operation to decelerate the car and stop it at the second floor.

The closing of the contact members SL3 energizes the retardation relay RW which closes its contact members RWl and RWZ, thereby short circuiting the resistors 1'2, 1'4 and T6 in the circuit of the field windings LMl, LM2 and LM3 of the low-speed motor LM. This increases the retarding torque of the low-speed motor for decelerating the car to arrive at the second floor landing at landing speed. As the car approaches closely to a position level with the second floor, the up switch UQ slides off the up cam U25, thereby deenergizing the up direction leveling relay UL to stop the car. The deenergized relay UL opens its contact members UL! in the circuit of the up direction switch U, thereby deenergizing that switch which in turn opens its contact members Ui and U2 to disconnect the motors from the supply conductors LI, L2 and L3, and also opens its contact members U3, thus deenergizing the brake coil it and applying the brake G5 which stops the car and holds it level with the second floor landing. The deenergized up direction switch U also opens its contact members U4, thereby deenergizing the non-interference relay K, but that relay does not immediately close its contact members Kl because of the time delay provided by its dashpot IS. The deenergized switch U also, in opening its contact members U4, deenergizes the low-speed line switch L, which in turn deenergizes the retardation relay RW, returning them to their normal condition ready for use the next time the car is to be decelerated to a stop at a floor.

As the car stops at the second fioor, the waiting passenger opens the door 2!) and enters the car, thereby opening the door and gate contact members 50 and thus deenergizing the door relay E.

Upon the expiration of the predetermined time of delay for which the dashpot l9 of the relay K is designed, that relay closes its contact members Ki in the circuit for the car operating push buttons, thereby conditioning the car for its next operation.

By the foregoing operation it is seen how the car may be called to a floor by a passenger pressing the button at that floor.

It will be assumed now that the waiting passenger at the second floor enters the car, closes the door and presses the car button IC to cause the car to move to and stop at the first fioor. The closing of the door closes the door contact members 59, thereby energizing the door relay E to prepare the control system for moving the car when the car button is operated. The pressing or" the button IC energizes the floor stopping relay is for the first floor by the following circuit:

L+5, Ki, 5!, 3Ca, 20a, lCb, IS, 232, 352, 53, L5. The energized relay lS opens its contact members is? and IS! and closes contact members 183. The closed contact members IS3 provide a holding circuit for the coil is, and the opened contact members is! cause the down direction relay DP to be energized because it opens the circuit which formerly existed through contact members lSl, contact segment ZDa, brushes 3D and 32, and contact segment 28 to L-5, and causes the current to fiow now from L+5 through resistor T8 and coil DP to L5.

The energized. relay DP opens its contact members DP! and DP4 and closes its contact members DP2, D1 3 and DP5 to cause the car to start to and stop at the first floor. The closing of the contact members DP3 energizes the starting switch G to close its contact members G2, G3, G4 and G5 and open its contact members GI. The closing of. the contact members G5 energizes the down direction switch D by the following circuit: L-ll, U5, D, U1 5, DP5, G5, E3, L-d. The energized down direction switch D thereupon closes its contact members Dl D2, D3 and D5 and opens its contact members D4 and D3 to start the highspeed motor, release the brake and move the car down to the first floor. The closing of the contact members Di and D2 connects the field windings of the highspeed motor HM to the supply conductors Li, L2 and L3. The closing of the contact members D5 energizes the non-interference relay K and the high-speed line switch H.

The energized relay K opens its contact members KI in the push button circuit thereby preventing appropriation of the car by other passengers. The energized relay H closes its contact members H! and H2, thereby energizing the field windings HM! and HM2 of the high-speed motor to start the car downwardly. The energized relay H also closes its contact members H3, thereby energizing the high-speed relay I-IVV to close its contact members HW% and HWZ after the time delay caused by the dashpot 22 to short circuit the resistors Tl, T3 and T5 in the field winding circuit of the high-speed motor so that the motor will operate at its normal high speed in moving the car down to the first floor.

The car now moves toward the first fi-cor and the up leveling switch UQ leaves the cam U25, thereby deenergizing the leveling relay UL. However, this relay had no effect because the contact members DPd are open in the U switch circuit.

As the car approaches within stopping distance of the first floor, the down leveling switch DQ engages the down cam D25 for the first floor and thereby energizes the down leveling relay DL, which closes its contact members DLi in an additional circuit for the down direction switch D, thereby maintaining that switch in its energized condition. At about the same time, the down brush 3! engages the down contact segment IDA,

thereby deenergizing the down direction preference relay DP to cause the high-speed motor HM to stop operating the car and permit the lowspeed motor LM to take over the operation of the car for the purpose of retarding it and moving it into the first fioor at a desirable stopping speed. The deenergized relay DP opens its contact members DP3, thereby deenergizing the starting switch G which in turn opens its contact members G2 to deenergize the high-speed line switch H and close its contact members Gl to energize the lowspeed line switch L. The deenergized switch H opens its contact members Hi and H2, thereby deenergizing the field windings HMI, HMZ and of the high-speed motor. The opening of the contact members H3 also deenergizes the high-speed accelerating relay HW which restores the resistors of the high speed motor to their normal circuit.

The energization of the line switch L closes its contact members SLI and SL2, thereby energizing the field windings LMl, LM2 and LM3 of the low-speed motor to cause that motor to start in operation and carry the car into the first fioor landing at its landing speed. The energized relay SL also closes its contact members SL3, thereby energizing the retardation relay RW, which, after the expiration of the predetermined time delay for which it is set, closes its contact members RW! and RW2, thus short circuiting the resistors T2, 1'4 and T8 in the field winding circuit of the low-speed motor to increase its retarding torque for decelerating the car to its landing speed.

The car is now approaching the first floor landing on its downward movement at its stopping speed, and, as it reaches the point where it should be stopped, the down leveling switch DQ runs off the down cam D25 and thereby deenergizes the down leveling relay DL which opens its l contact members DLI, thus deenergizing the down direction switch D to stop the low-speed motor and apply the brake to stop the car level with the fioor. In doing this, the deenergized switch D opens its contact members DI and D2 to disconnect the motors from the supply conductors LI, L2 and L3 and opens its contact members D3 to deenergize the brake coil 16 and apply the brake [5 to hold the car at the first floor. The passenger now opens the gate and the door and leaves the car, thus opening the gate and door contact members 50, thereby deenergizing the door relay E. The deenergized relay D also opens its contact members D5, thereby deenergizing the non-interference relay K, and after the expiration of the time delay occasioned by the dashpot l9 on that relay, it closes its contact members Kl to render the push buttons ready for the next operation of the car.

However, at this point in the operation, it will be assumed that the floor selector arm 33-3 and the brushes 323, 3| and 32 thereon are ahead of the position of the car and are out of step with v iii to place the floor selector in step with the movements of the car.

The energized relay X closes its contact members Xi thereby energizing the floor stopping relay for the basement fioor by the following circuit: L-i-e, Ki, 55, XI, BS, ISZ, 2S2, 3S2, L-5. The energized relay BS opens its contact members 136i and closes its contact members BS2. The closed contact members BS2 provide a selfholding circuit for the relay BS. The open contact members BS! causes energization of the down direction preference relay D by eliminating the short circuit around that relay. The energized relay DP opens its contact members DPS and DPLl and closes its contact members DB3 and DPS. fhe closing of the contact members DPS energizes the starting switch G, which in turn closes its contact members G5, thus energizing the down direction switch D to start the car downward. The energized switch D closes its contact members Di and D2, thereby preparing the hoisting motor field circuits for energizaticn and closes its contact members D3 to release the brake l5. The closed contact members D5 energize the non-interference relay K to open its contact members KI and prevent operation of the other fioor relays while the relay BS is in action. The closing of the contact members D5 also energizes the high-speed line switch H, which closes its contact members Hi and H! to energize the field windings HM2 and HMS of the high-speed motor, and closes its contact members H3 to energize the high-speed accelerating relay HW, which in turn, after a predetermined time delay, closes its contact members HWi and I-IW2, thereby short circuit ing the resistors Tl, 1'3 and T5 in the high-speed motor field windings. The car is now moving downwardly toward the basement at its normal high speed.

As the car leaves the floor, the up leveling switch UQ leaves the up leveling cam U25, but the operation of the levelingrelay UL has had no effect on the up direction switch because the contact members DP l were opened in the circuit for that switch when the down direction preference relay was energized. As the car travels to the basement floor, it reaches the point where it should be decelerated for the stop at the basement fioor. At this point the down leveling switch DQ, engages the down leveling cam D25 and is thereby operated to energize the down leveling relay 'DL, which closes its contact members DL! and a second circuit for the down direction switch D and holds that switch in until the car is level with the basement floor.

When the down leveling switch DQ strikes the cam D25, the down brush 3i engages the down contact segment BDA for the basement and thereby short circuits the down direction preference relay DP, thus deenergizing that relay which opens its contact members DP3, thus deenergizing the starting switch G which in turn opens its contact members G4 to deenergize the basement floor relay BS and opens its contact members G2 to deenergize the high-speed line switch and closes its contact members G! to energize the low-speed line switch L. The deenergized switch H opens its contact members HI and H2,

thus deenergizing the field windings for the highspeed motor and also opens its contact members E3 to deenergize the high-speed accelerating switch HW to return. the resistors in the highspeed motor field windings to their normal condition. At the same time the energized low-speed line switch SL closes its contact members SLI and SL2, thereby energizing the field windings of the low-speed motor LM to take over the operation of the car and run it into the basement fioor landing at stopping speed. The energized switch SL also closes its contact members SL3, thereby energizing the retardation relay RW to close its contact members RWI and RW2 after a predetermined delay, thus short circuiting the resistors r2, rd and r5 out of the circuit for the field windings of the low-speed motor to increase the retardation torque of that motor.

At this point the car is near the basement fioor landing and inasmuch as the selector arm 33 and the brushes thereon are ahead of their correct position with reference to the car, the arm engages the block id and inasmuch as the car is still moving, the clutch 38 slips and permits the shaft 3?, the gears 36 and 35 and the shaft 34 to stop operation while the car catches up with the position of the selector arm so that the selector arm is now disposed in an accurate position with reference to the position of the car to insure accurate operation of the car in the future until the arm again gets out of its correct position and is reset by engagement with the block 40 at the basement terminal or with the block M at the third fioor terminal.

As the car reaches its stopping position at the basement fioor level, the down direction switch DQ runs oif the down direction cam D25 for the basement floor, thereby deenergizing the down leveling switch DL to stop the hoisting motor and apply the brake. The deenergized relay DL opens its contact members DLl, thereby deenergizing the down direction relay D which opens its contact members Di and D2 to deenergize the low-speed motor and also opens its contact members D3 to deenergize the brake coil, thereby applying the brake iii to stop and hold the car at the basement fioor. The de energized switch D also opens its contact members D5, thereby deenergizing the non-interference relay K and the low-speed line switch SL, which in turn deenergizes the retardation relay RW to return the resistors for the low-speed field winding to their normal condition. Thus the car is stopped level with the floor with its floor selector in correct position with reference to the position of the car.

By reason of the foregoing description, it will be seen that I have provided a means for causing the position of the car selector arm to be automatically corrected when it gets out of its correct position, even though the car fails to run to its correcting terminal. It will also be apparent that the correcting means may be placed at any floor desired or at all the floors, and that it may be provided for the up direction as well as for the down direction.

Further, it is apparent that the correcting means is rendered ineffective While the car is moving between the floors in normal operation by the opened condition of the contact members K! of the non-interference relay K, so that no inconvenience will be caused by the correcting means trying to operate while the car is moving.

Although I have illustrated and described only one specific embodiment of the invention, it is obvious that many changes therein and modifications thereof may be made Without departing from the spirit and scope of the invention.

I claim as my invention:

1. In an elevator system for operating a car serving a plurality of floors between terminals, motive means, means connecting the car to the motive means whereby operation of the motive means moves the car past the floors, control means for operating the motive means, a floor selector comprising a plurality of contact segments disposed according to the floors and a cooperating brush, means responsive to operation of the motive means in moving the car for moving the brush over the contact segments in accordance and in step with the movement of the car past the floors so that with the car at any floor the brush will be on the contact segment for that floor, means responsive to the brush being out of step with the car while it is moving into a terminal for correcting the position of the brush so that it will be in step with the car, and means responsive to the brush getting out of step with the car while the car is between terminals for causing the control means to efiect the movement of the car to a terminal to correct the position of the brush.

2. In an elevator system for operating a car serving a plurality of floors between terminals, motive means, hoisting means connecting the car and the motive means, control means for causing the motive means and the hoisting means to operate the car past the floors, a floor selector comprising a plurality of contact segments disposed according to the floors and a cooperating brush, means responsive to operation of the motive means in moving the car for moving the brush over the contact segments in accordance and in step with the movement'oi the car past the floors so that with the car at any floor the brush will be on the contact segment for that floor, call means for each fioor for registering calls for the car at that floor, means responsive to the brush getting out of step with the car while it is operating at the floors intermediate the terminals for operating the call registering means for a terminal to move the car to that terminal, and means responsive to movement of the car to the terminal for correcting the position of the brush and placing it in step with the car.

3. In an automatic elevator push-button control system, the combination comprising a car movable past floors between two terminal floors, push-buttons at the floors, call registering means responsive to operation or any one of said pushbuttons for causing said car to move to the floor corresponding to the operated button, said means comprising a floor selector in which moving elements cooperate with stationary elements, said moving elements moving normally in accordance with movements of said car; an additional element with said moving elements, and a cooperating stationary element responsive to said additional element moving a different than normal amount as said car moves for operating a call registering means for a terminal floor to cause the car to move to that floor.

4. In an elevator system for operating a car serving a plurality of floors between an upper terminal and a lower terminal, motive means for driving the car, a floor selector for the car comprising a plurality of stationary contact segments for the floors and a cooperating contact brush, means connected to the motive means for driving the contact brush over the contact segments in accordance with the movements of the car for connecting circuits for the car in accordance with the position of the car with reference to the floors, a correcting segment and a cooperating correcting brush mounted on the floor selector and so displaced with reference to the contact segments and the contact brush that they will not be in contact when the contact brush is correctly engaging a contact segment but will be in contact when the contact brush is not correctly engaging a contact brush while the car is standing at a floor, and means responsive to engagement of the correcting brush with the correcting segment while the car is standing at a fioor for causing the position of the contact brush to be corrected to move it into step with the position of the car.

5. In an elevator system for operating a car serving a plurality of floors between terminal floors, motive means, hoisting means connecting the car and the motive means, control means for causing the motive means and the hoisting means to operate the car to serve the floors, a floor selector comprising a plurality of contact segments and a cooperating brush, means for supporting the contact segments in accordance with the floors, an arm for supporting the brush,

means responsive to operation of the motive means in moving the car for moving the brush arm to carry the brush over the contact segments in accordance and in step with the movement of the car past the floors so that with the car at any floor the brush will be in a predetermined position for the contact segment for that floor, a correcting segment mounted on the segment-supporting means, a correcting brush mounted on the brush arm in position to engage the correcting segment when the brush arm is out of step with the position of the car, and means responsive to engagement of the correcting brush and the correcting segment for cornoting the position of the brush arm to bring it into step with the position of the car.

In an elevator system for operating a car serving a plurality of floors between terminal floors, motive means, hoisting means connecting the car and the motor, control means for causing the motive means and the hoisting means to operate the car to serve the floors, a floor selector comprising a plurality of contact segments and a cooperating contact brush, means for supporting the contact segments in accordance with the floors, an arm for supporting the contact brush, means responsive to operation of the mo tive means in moving the car for moving the brush arm to carry the contact brush over the contact segments in accordance and in step with the movement of the car past the floors so that with the car at any floor the contact brush will be in a predetermined position for the contact segment for that floor, a correcting segment mounted on the segment supporting means, a

correcting brush mounted on the brush arm in 7 position to engage the correcting segment when the brush arm is out of step with the position of the car, a call means for a terminal for registering calls for the car at that terminal, means responsive to engagement of the correcting contact segment and the correcting brush for operating the call registering means for the terminal, and means responsive to movement of the car to the terminal for correcting the position of the brush arm to place the contact brush in step with the position of the. car.

'7. In an elevator system for operating a car serving a plurality of floors between terminal floors, motive means, hoisting means connecting the car and the motive means, control means for causing the motive means and the hoisting means to operate the car to serve the floors, a floor selector comprising a plurality of contact segments and a cooperating contact brush, means for supporting the contact segments in accordance with the floors, an arm for supporting the contact brush, means responsive to operation of the. motive means in moving the car for moving the brush arm to carry the contact brush over the contact segments in accordance and in step with the movement of the car past the floors so that with the car at any floor the contact brush will be in a predetermined position for the contact segment for that floor, a correcting contact segment mounted on the segment supporting means, a correcting brush mounted on the brush arm in position to engage the correcting segment when the brush arm is out of step with the position of the car, a call means for a terminal for registering calls for the car at that terminal, means responsive to engagement of the correcting contact segment and the correcting brush for operating the call registering means for the terminal, means responsive to movement of the car to the terminal for correcting the position of the brush arm to place the contact brush in step with the position of the car, and means responsive to operation of the car for rendering the correcting segment and the correcting brush ineffective to operate the call registering means while the brush arm is moving.

8. In an elevator control system for an elevator car operable past a plurality of floors in which the car is caused to stop at any floor in response to the operation of a push button associated with said floor; means movable in accordance with the position of said car for causing said car to stop accurately at any one of said floors, additional means responsive to said first-named means not moving in accordance with movements of said car for causing an additional movement of said car, and means responsive to said additional movement for realigning the relative position of said first-named means with respect to said cars position.

9. In an elevator system for operating a car serving a plurality of floors between terminal floors, motive means, hoisting means connecting the car and the motive means, control means for causing the motive means and the hoisting means to operate the car to serve the floors, a floor selector comprising a plurality of contact segments and a cooperating brush, means for supporting the contact segments in accordance with the floors, an arm for supporting the brush, means responsive to operation of the motive means in moving the car for moving the brush arm to carry the brush over the contact segments in accordance and in step with the movement of the car past the floors so that with the car at any floor the brush will be in a predetermined position for the contact segment for that fioor, a correcting segment mounted on the segmentsupporting means, a correcting brush mounted on the brush arm in position to engage the correcting segment when the brush arm is out of step with the position of the car, means responsive toengagement of the correcting brush and the correcting segment for correcting the position of the brush arm to bring it into step with the position of the car, and means responsive to operation of the control means to move the car for rendering the correcting segment and correcting brush ineffective while the car is moving.

10. In elevator operating apparatus comprising means to move a car to a succession of landings,

a floor finder subject to getting out of correct adjustment with the car, and means operative by movement of the car to a terminal landing to correct the adjustment of the finder when it is out of adjustment towards said landing, the improvement which comprises a device instrumental in causing the car to be sent to said terminal landing and means controlled by the relative position of the car and finder, when the car is stopped at one selected landing, for actuating said device when the finder is out of adjustment towards said terminal landing.

11. In elevator operating apparatus comprising means to move a car to a succession of landings, a floor finder subject to getting out of correct adjustment with the car, and means operative by movement of the car to a terminal landing to correct the adjustment of the finder when it is out of adjustment towards said landing, the improvement which comprises a circuit establishing a condition requiring the car to be sent to said terminal landing and means controlled by the relative position of the car and finder, when the car is stopped at one selected landing, for actuating said circuit when the finder is out of adjustment towards said terminal landing.

12. In elevator operating apparatus comprising normal switch means to move a car to a succession of landings, a fioor finder subject to getting out of adjustment with respect to the car and 7 means operative by movement of the car, in'

addition to its movements caused by said normal switch means, to correct the adjustment of the finder with respect to the car, means responsive to the car and finder being out of adjustment at a landing to cause said additional movement of the car.

13. In an elevator control system for an elevator car operable past a plurality of fioors in which the car is caused to stop at any floor in response to the operation of a push button associated with said floor; means movable in accordance with the position of said car for causing said car to stop accurately at any one of said floors, additional means responsive to said firstnamed means not moving in accordance with movements of said car for causing an additional movement of said car, and means responsive to said additional movement for realigning the relative position of said first-named means with rerelays for sending the car to the terminal landings, automatic leveling means in addition to said fioor finder, a movable contact driven with the floor finder, stationary contacts at the two sides of the position of said movable contact when the car is leveled at the main landing and the floor finder is in correct adjustment, and connections from said contacts which are inoperative while the car is moving and until leveling is completed and are operative after leveling is completed to energize the circuit to the respective relay for sending the car to a terminal landing if said movable contact engages the stationary contact towards said landing.

CHARLES F. CARNEY.