US710914A - Electric operation of elevators by single push-button system. - Google Patents

Description

Patented Oct. 7, I902.

.1. n. IHLDER. ELECTRIC OPERATION OF ELEVATORS BY SINGLE PUSI'I BUTTON SYSTEI.

(Application filed Doc. 6, 1897.)

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' J. D. IHLDER. ELECTRIC OPERATIDN 0F ELEVATORS BY SINGLE PUSH BUTTON SYSTEM.

(Applicgtion filed Dec. 6, 1897.)

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J. D, IHLDER. ELECTRIC OPEBATIDN 0F ELEVATORS BY SINGLE PUSH BUTTON SYSTEM.

(Application filed Dec. 6, 1897.] (No Model.)

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UNITED STATES PATENT OFFICE.

JOHN T). ITTLDER, OF YONKERS, NEW YORK.

ELECTRIC OPERATlON 0F ELEVATORS BY SlNGLE PUSH-BUTTON SYSTEM.

SPECIFICATION forming part of Letters Patent NO. 710,914, dated October 7, 1902.

Applicationfilcd December 6, 1897. fierial No. 660,873. (No model.)

To all Hill/077W if Tim/y GUN/(3877M Be it known that I, JOHN D. IHLDER, a cit izen of the United States, residing at Yonkers, in the countyof \Vestchester and State of New York, have invented certain new and useful Improvementsin Electric Operation of Elevators by Single Push-Button System, of which the following is a specification.

My invention relates to the electrical operation of elevators by the use of a single pushbutton system; and ithas for its object to provide a simple, cheap, and elfective system of controlling elevators; and it consists in the various features of construction and arrange ment of parts having the general mode of operation substantially as hereinafter more particularly set forth.

In the accompanying drawings, Figure l is a diagrammatic representation of devices arranged to operate in accom'lance with my invention. Fig. 2 is a similar diagrammatic representation showing another embodiment of my invention. Figs. 3 and 4 are respectively side and sectional views of a floor controller such as I prefer to use in connection with my system. Figs. 5 and 6 are respectively side and end views of an electric reversing-switch such as I prefer to use. Fig. 7 is a side view of a modified form of drum for, the floor controller, and Fig. 8 is a diagram of a modification.

Heretofore means have been provided for electrically operating elevators by means of push-buttons (and by push-buttons I mean any sort of electrical switch ordevice for controlling the circuits) arranged on the different floors, so that the elevator can be set in motion through the engine and brought to any desired floor, and as ordinarily constructed these mechanisms are relatively complex and expensive; and it is the object of my present invention to provide means whereby by the use of a single push-button or eircnit closer in connection with each door the elevatoncar may be brought automatically to that iloor ready for use.

As a further improvement by my present invention it is not necessary that the operator should the car and break the circuit.- to stop it, as it will automatically stop at the floor to which it is called. Further, it is not necessary to keep the button closed, as an ordinary pressure of a few seconds duration is all that is required to call the elevator to the desired floor, regardless of its position.

Again, the system is non-interfering, in that when a push-button at one floor has been pressed the pressure of any push-buttons at other floors will not interfere with the operation of the elevator. Further, means are provided whereby the elevator can be operated from the car by simply pressing an y bu tton, and means are also provided whereby if the operator changes his mind and desires to stop'at some intermediate floor or at any other position he can instantly do so. Safety devices are also used in connection with the system, whereby if any door of the well or the door of the elevator-cage is opened the circuit is broken and the elevator cannot be moved until the doors are properly closed. To accomplish these results and others which will appear more fully hereinafter by means of an inexpensive system which is practicable and capable of being operated by a single push-button at each tioor'is the main object of my invention, and it includes not only the system generally, but the improvements connected with the system,which are capable of use not onlyin this connection but for other purposes; and I will now proceed to describe the embodiment of myinvention sufficiently to enable those skilled in the art to make use of the same, it being understood,ofcourse, that my invention is not limited to the precise construction and arrangement of parts set forth, which will be varied according to the exigencies of any particular case.

The invention is specially adapted for use in connection with d u mb-waiters, freight'elevators, or other moving vehicles on which the operator does not ride, but which it is desired to call or send to any particular floor or position and have it automatically stop there regardless of its prior position, and in Fig. 1 I have illustrated the circuits and devices necessary to accomplish this result under the general terms of my invention.

In the drawings, A is a shaft of an armature A of an electric motor, which is the preferred means of operating the elevator-car, the car and connections between the armature and the motor for operating it being omitted, as they may be of any well-known or desirable construction, it only being necessary that they are such connections that as the armature of the motor rotates in one direction the car will be moved in one direction, and when the armature of the motor rotates in the other direction the car will be is controlled, it being understood that the brake is normally on to prevent the engine operating except when the current is flowing through the magnet A when the brake is released and is automatically applied when the current ceases.

For convenience of illustration, a a 0, 0. represent binding-posts on the motor,to which the terminals of the motor-circuit are connected and to which also the circuits lead ing to and from the motor are connected.

In order to control the circuits of the motor, I make use of an electric reversing-switch Byand while this may vary in construction and operation, it only being necessary to be so constructed as to control the circuits of the motor and to be controlled by the elevator-operating circuits, I prefer the construction illustrated more fully in Figs. 5 and 6 and indicated in the diagram by similar letters. In the present instance the electric reversing-switch consists, essentially, of two magnets 13 B arrangedv opposite to each other, with an armature B suspended between the magnets. Mounted in the armature are a number of double-faced contacts I) b 17 b preferably of carbon, and each connected by a suitable conductor to-a corresponding binding-post screwed on the top of the armature or otherwise. These doublefaced contacts on the armature are arranged .to cooperate with similar contacts arranged on either side of the armature and preferably under the magnets, and these contacts are designated for convenience in the present instance as b b b b b 19 b b, as indicated in the diagram. These latter contacts b to b are shown as mounted in cups B having stems 13, extending through the supports B under the control of springs, as B so that good and satisfactory contact can be made between all the contact devices of the moving armature and the corresponding contactson one side thereof, securing a spring-pressed yielding contact between them.

13 represents a mechanically-pressed pin on the magnet tending to separate the contacts and overcome any electric adhesion or other tendency to stick.

claim the same, as I am informed and believe it is not proper subject-matter to be claimed in connection with the other features of my invention, but reserve all rights to claim the same in a separate application.

In order to operate the electric reversingswitch automatically when any push-button corresponding to any fioor or stopping-place is operated, I provide what I have termed a floor controller 0, and this is indicated diagrammatically in the drawings, and the preferred mechanical embodiment of which is shown more particularly in Figs. 3 and 4. This controller is connected in some suitable way to be operated in unison with the motor or the engine of the car, and I have indicated a sprocket-wheel A mounted or connected to the shaft A of the motor, and'a sprocketrally on a smaller drum, as indicated, and the drum iscaused to move longitudinally as Well as rotatively,andin the presentinstance I have shown a worm-shaft -0 fixed in the frame, and connected therewith isadisk O to which the arms carrying the brushes bearing on the spiral contacts are supported, only one being, shown in Fig. 4 for convenience of illustratration. The drum 0 is screw-threaded to fit the worm-shaft O and is rotated thereon by any suitable means-as, for instance, the cross-head (1 connected to move with the sprocket-wheel G, and it will "be apparent that while the drum 0 rotates in one direction or the other it is also moved longitudinally on the worm-shaft C and as the pitch of the spiral contacts 0 C on the drum corresponds to the pitch of the worm-wheel the brushes will continuously bear on said spiral contacts and travel over the same as the drum is rotated. While this is the preferred construction of the floor controller, it is apparent that the principles thereof can be embodied in other forms, and instead of being .a rotating drum it may be a moving plate or other similar device, the essential being that it shall automatically control the circuits, substantially in the manner hereinafter set forth.

In the present arrangement in connection with the floor controller there are eight brushes bearing on the spiral contacts, which are sufficient to control an elevator used for six floors or stopping-places or stations, and in the diagram instead of showing the spiral contacts I have shown contacts in the form of two semicircles, which is the equivalent and may be used, except that it requires too large a drum for convenience of operation,

the principles of operation, however, being precisely the same as when the spiral contacts are used. There is abrush c normally engaging contact 0 and connected by a conductor with one of the coils B of one of the magnets B B of the electric reversing-switch B, and there is another brush 0 normally bearing on the contact 0 connected to the coil B of the other magnet B B of the reversingswitch, and it will be observed that both of these magnets are connected directly to the minus feeding main, and when a current flows through one or the other of the coils B B the corresponding magnet B .1 is energized and the armature ]3 moved to one or the other side to close the circuit between the double faced contacts and one or the other of the set of contacts corresponding with the magnet energized, and consequently the circuits through the motor will be in a direction to cause it to raise or lower the elevator, as required. Also arranged in connection with the floor controller are a series of brushes f f f fif f, one for each floor or stopping-place of the elevator-car and numbered to correspond with the stations F F F F F. Connected to each brush f to f is a conductor (Z d d d d d, each including a circuit-making magnet D and each leading to a position corresponding with its respective floor and terminating at the push-button or other switch device for that floor. The armature D of each of the circuit-making magnets D is connected to a conductor 6, leading to the center of the coils of a doubly-wound circuit-breaking magnet E, and leading from the armature E of said magnet is a conductor having branches 6 c e e" e 6, leading to the push-buttons corresponding to the floors, the push-buttons or circuit-closing devices in the present instance being represented by the pins 5 g g g Also leading from the circuit-breaking magnet E is a conductor I-l, including the circuit-breakers 7;. 7L2 7L3 7t" 7r 7t, controlled by the doors of the well corresponding to the different floors, and this conductor H extends to and is connected with the main leading-wire plus and may include a resistance H, so that the current flowing therethrough may be properly regulated.

I will now explain briefly the operation of the apparatus so far described, and assuming that the doors to the well are all closed, closing the contacts h to it, and assuming,for instance, that the elevator is at the bottom of the well and it is desired to cause it to rise to the top floor F, the button g is pressed for an instant, closing the circuit, which may be traced through the conductor H, contacts h to it, through the circuit-breaking magnet E, the coils of which are wound in opposition, through the armature E and conductor e to conductor (Z through the coil of the corresponding circuit-making magnet D to the brush f, bearing on the contact 0. Thence the current passes to the brush 0 through the coils B of the electric reversing-switch B to the minus main. This energizes one of the magnets of the electric reversing switch, moving the armature 13 thereof in the proper direction, causing its double-faced contacts I) b 0 11 respectively, to make contact, say, with the contacts I) b b thus closing the circuit of the motor, which may be traced as follows: from the plus main through the contacts I)" b to binding-post a, whence a branch includes the brake-magnet A From post tt extends a conductor to the series field-magnet coils A thence through the binding-post 663, contacts 1) if b ,binding-post c through the armature to binding-post a, contacts b" b b b 5 and out, thus causing the motor to rotate in a certain direction to raise the elevator. This will cause the floor-controller drum to rotate in the direction of the arrow, and it will be seen that this circuit would be maintained until the drum rotated sufliciently to allow the brush f to come upon the insulating portion C between the contacts 0 C, which would break the circuit of the magnet B releasing the armature of the reversing switch and stopping the motor. In order to overcome the necessity of holding the pushbutton g in contact position and in order to prevent interference with the elevator when it has once started, the circuits are arranged so that immediately on completion of the circuit closed by the push-button g the circuitmaking magnet D attracts its armature D, making a parallel and shorter circuit through the door-contacts 7t to 7t,conductor H,through one coil only of the circuit-breaking magnet E and the armature and coils of the circuitinaking magnet D, through the brush f and out, as before. One of the coils of the circuitbreaking magnet E is therefore shortcircuited and the core becomes magnetized, attracting its armature E, breaking the circuit 6, leading to the push-button, and as soon as this is accomplished the button may be released and breaks the push-button circuit without sparking, since it is without current. The motor will then continue to run, revolving the elevatormachine in the proper direction and the connected floor controller until the brush f arrives at the insulated portion, which breaks the energizing-circuit of the electric reversing-switch l3 and releases its armature, therebyinterrupting the elevator-motor and breaking the circuit and stopping the car. If in the meantime any other push-button, as g 9 is operated, the circuit cannot be completed so as to interfere with the travel of the car until it reaches its destination, when the circuit will be broken at the floor controller and the car remain at the desired station. When the car arrives at the desired floor, if the door of the well is opened, breaking the contact h, it will be obvious that the car cannot be started until such contact is closed. It is also obvious that in order to prevent any one at an intermediate floor operating the door well-known contrivances may be used which will prevent the opening IIO of the door except when the elevator-car is opposite thereto. If then, the elevator being at the top floor, it is desired at any other floor, the'corresponding push-button is pressed, and the well-doors being closed, as before, the circuit will be completed, except that the reversing-switch will be operated to close the circuits through the motor to cause it to move the elevator in a downward direction, and when it has once started the push-button may be released and no one can interfere with the operation of the elevator until it reaches its destination.

In Fig. 2 I have shown a substantially similar invention embodied in a somewhat-different arrangement and better adapted for use in connection with passenger-elevators, and in this case corresponding parts are correspondingly lettered and need not be specifically described. The motor in this case is shown as a shunt-field motor, in which the coil A is in the shunt-field, and there is a coil A in the armature-circuit which may be in the form of a series field-coil or an external resistance, and there is shown a switch S, controlling the circuits, which is adapted to be operated by the automatic stop-motion device in common use with elevators or by other well-known appliances and which have no immediate connection with the present invention. In this diagram I have shown a set of push-buttons arranged in the car, (indicated at I,) and it will be seen that the circuit H is extended into the car to include a gate or door contact h", and it also includes a pushbutton g by means of which the circuit can be broken at any time by a person on the car, so that incase of emergency or change of purpose the car can be immediately stopped at any desired position. The push-buttons in the'car are lettered correspondingly to the push-buttons at the floor-landings, and the connections need not be further described than to say that closure of a push-button corresponding to any fioor at the floor-landing or on the car will close the circuit through the reversing-switch, which will close the circuit through the motor in the proper direction and move the car and the floor controller, and, as before stated, this being closed the push-button can be released and the closure of any other push-button corresponding to any floor will not interfere with the operation of the elevator, but the breaking of the circuit by push-button will stop the car at once. It will also be noticed that the car cannot be started until the gate or door thereon is closed, as well as the doors of the well.

In the operation of fast-speed elevators or in cases where the load varies or in any other case where on account of the varying mo- I mentum of the masses in motion it is difficult to stop the car automatically at the exact position desired under the varying loads or speeds I have found it desirable to provide some means to automatically reduce the speed of the car before it reaches the floor mediate the first contact.

or point at which the automatic stop is to be made, and in this way the speed is reduced to such an extent from its normal speed that the car can finally be brought to rest at practically the exact position under all conditions of load or speed. This slow speed before the stop is arranged to be produced automatically and may be accomplished in various ways, as by a circuit controlling an additional shunt field-winding, a short-circuiting resistance in the shunt field making a parallel circuit to the'armature, or other equivalent means, and in the present instance I have shown an additional shunt field-winding automatically controlled by the floor controller. This is illustrated in Figs. 2 and 7, and while various ways of accomplishing this may be used the one adopted is simple and effective. In place of the drum shown in Fig. 4 I use a drum 0 as indicated in Fig. 7, in which in addition to the spiral contacts 0 0 there are two secondary spiral contacts 0 0 arranged inter- The break 0 between the spiral contacts 0 O is' greater in extent than the break between the secondary spirals O O, and in the present instance I have provided the latter spirals with lateral extensions 0 0 extending into the break C Bearing on these secondary spirals are the brushes 0 0 which are respectively connected toinclude the coils JJofthe magnet. The armature J which is shown diagrammatically as two blocksor contacts normally separated, one of which is understood as being a front contact for the armature, and the other to be on the armature of this magnet, is connected to the conductors 7c 75, the former of which is connected to the binding-post ct, and the latter is connected through the additional shunt field-coil K to the binding-post a With this arrangement, supposing any one of the push-buttons g to g is operated the current passes through the corresponding brush f to f, through the contacts 0 0 according to the previous position of the elevator, and the motor is operated as before described. When, however, such brush approaches the break 'or gap G it passes off from the contact O or 0 onto one of the secondary contacts or 0 thus closing the additional shunt field-magnet circuit, causing the motor to reduce its speed, and a further movement of the floor controller causes the brush to pass onto the break or gap 0 which breaks the circuit of the motor and reversing-switch, and the car immediately comes to rest. It will be seen that according to the direction of the travel of the car either coil J or J of the magnet is energized, attracting the armature J 2 to close the circuit of the conductors k k, and as soon as the circuit is broken this magnet is denergized and the armature-contacts separate. It is evident that the converse of this is true and that when a push-button is pressed and the motor started to bring the car to any desiredfloor the floor controller also starts to move, and when either of the brushes passes oil? from the break or gap C it first bears on one of the secondary contacts C or C, as the case may be, thus energizing one of the coils J or J, attracting the armature J and closing the circuit 7t 7t, so as to include the additional shunt field-magnet coil K in the circuit of the motor, and the motor will start with a relatively slow speed and strong torque, and when the brush passes from the contact C or C onto the contact C or C the circuit of the coil J or J is broken and the additional shunt field-coil K is automatically cut out of circuit, and the speed of the motor is thereby accelerated or increased to the normal speed.

Other means of introducing the slow-speed devices into the circuit may be used; but it will be seen that in this construction as the floor controller moves around corresponding to the position of the car and the car approaches the desired floor the particular floorbrush will reach the end of the spiral contact and. pass onto the secondary spiral contact, closing the additional shunt field-magnet circuit and causing the motor to reduce its speed, and then as soon as the floor-brush reaches the central position of the gap and breaks the circuit the car will come to rest automatically and immediately at the desired position regardless of the varying load. It will be observed that by this comparatively simple arrangement of circuits I provide a non-interfering system for controlling the movements of the car requiring only the closure of a single push-button or switch, which can be almost instantly released, and the car will an tomatieally be brought to the floor without further attention from the operator, and its movements can not take place unless the parts are all in condition for safety and the prevention of accidents.

The system involves a reversing-switch for the motor, a floor controller, a circuit-making magnet for each floor, a single circuit-breaking magnet, and a single push-button for each floor, and of course when used a door-contact for each floor and an automatic stopmotion switch or other safety appliance employed in the well-known way.

It will be observed that this system is not only applicable to dumb-waiters and freightelevators, where, if desired, the push-buttons can all be arranged adjacent to each other and not necessarily on the floors or at the stations, but also to passenger elevators, where the occupant of the car or a person on any of the floors or stations can control the movements of the car by the simple pressure of a single push-button without danger of interference from others.

While I have shown the push-button circuit and the magnets for operating the reversing-switch as a branch of the main cir cuit, which is the preferred form, it is evident that it can receive its current from a separate source without materially changing the operation of the device, and this is indicated at M, Fig. 1, which shows an indication of a gal vanie battery and points where it may be connected or interposed between the conductor leading to the switch magnet-coils B B and the conductor H instead of having these conductors connected to the main line furnishing current for operating the motor. Of course this source of power M may be a galvanic battery, storage battery, or any other well-known source of supply and is useful more especially when high-voltage currents are used to operate the motor.

\Vhile I have shown the floor controller operated by connections with the shaft of the motor, as above explained, it may be operated from any other part of the apparatus, and in some casesas, fol-instance, where the cable operating the car is liable to slip on the sheaves or become stretched or otherwise out of adjustment, so that the ear might not be stopped exactly at the desired position when the controller is operated by the motor-I arrange to have the floor controller operated by some mechanical connection from the ear, and in this way there is less liability of variations in action between the controller and car. In Fig. 8 I have illustrated diagrammatically one way of accomplishing this ob ject, in which A represents the lXlOt-OPSllft'fh, as before, and A a drum thereon, operating the cables N and N, connected with the car X and counterweight X, respectively, passing over the sheaves, as indicated. In this particular arrangement I have shown the car and counterweight connected by a sprocketchaiu N passing over a sprocket-wheel N on a shaft N, carrying a pinion N or other means connected to the wheel 0' of the door controller. This is a typical connection, and it will be seen that in this way the movements of the floor controller are more directly connected with the movements of the elevatorear, so that there is less liability of inaccurate movements or failure to stop at the desired point when the circuit is broken automatically by the floor controller. In this way I have positive and direct connections between the door controller and the car.

Vhat I claim is 1. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a floor controller, a puslrbutton for each floor, a circuit between each push-button and the floor controller, and means between the floor controller and each push-button for short-circuiting the pushbuttons, substantially as described.

2. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a floor controller, a push-button for each floor, a circuit between each push-button and the door controller, means between the floor controller and each push-button forshort-circuiting the push-buttons, and means for breaking the circuit of all the push-buttons, substantially as described.

3. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a rotary floor controller, a push-button for each floor, acircuit between each push-button and the floor controller, and means for short-circuiting any push-button when operated to close the circuit, substantially as described.

4. In an apparatus for controlling elevators, the combination with an electric motor for operating thecar in either direction, of an electric reversing-switch controlling the circuit of the motor, a floor controller controlling the operations of the reversing-switch, a push-button for each floor, and a circuit between eachpush-button and the floor controller, substantially as described.

5. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a single push-button for each floor or station, a circuit-making magnet for each push-button circuit, and a circuit-breaking magnet controlled thereby, whereby the push-button circuits are short-circuited and broken and interference prevented, substantially as described.

6. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of an electric reversing-switch, a floor controller con nected to operate the switch, a push-button for each floor, and a circuit between each push-button and the floor controller, substantially as described.

7. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of an electric reversing-switch, a floor controller operated by the motor and controlling the reversingswitch, a push-button for each fioor, a circuit between each push-button and the floor controller, and means in said push-button circuit for closing a circuit around the push-buttons, substantially as described.

8. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of an electric reversing-switch, a floor controller operated by the motor and controlling the'reversing-switch, a push-button for each floor, circuits between each push-button and the'floor controller, a circuit-making magnet in each push-button circuit, and a circuit-breaking magnet controlled by the circuit-making magnets and arranged to cut out the push-button circuits, substantially as described.

9. In an'apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of an electric reversing-switch, a floor controller operated by the motor and controlling the reversing-switch, a push-button at each floor, cirbreaker mounted on the car arranged to stop j the movement of the car on the breaking of the circuit, substantially as described.

10. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of an electric reversing-switch,a floor controller,a pushbutton for each floor, circuitsand connections between the push-buttons and floor controller, the floor controller comprising ,two contacts and brushes connected to the push-button circuits and electric reversing-switch, substantially' as described.

11. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a reversing-switch, a floor controller, a single pushbutton for each floor, and circuits including the push-buttons and floor controller, the floor controller comprising a drum, two spiral contacts mounted thereon and means formoving the drum longitudinally and rotatively, substantially as described.

12. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a reversing-switch, a floor controller, a single pushbutton for each floor connected to control the controller, and automatic means for reducing the speed of the motor before the motor is stopped, substantially as described.

13. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a'floor controller, push-buttons controlling the floor controller, an additional shunt field-magnet circuit, and means connected with the floor controller for controlling said additional fieldmagnet circuit to reduce the speed before the motor stops, substantially as described.

14. A car, a hoisting-motor therefor, means for accelerating the speedof the motor as it starts up, and means operated by the motor for automatically arresting the car at any predetermined point.

15. A car, a hoisting-motor therefor, and means actuated by the motor for reducing the speed thereof as the car approaches any predetermined stopping-point.

16. In an electric elevator, a hoisting-motor, a switch for controlling the circuits of said motor, electrical devices for actuating said switch, circuits for said electrical devices including movable contacts actuated coincidently with the travel of the car, and adapted to break said circuits when the car arrives at its predetermined stopping-place, and electrical switches having an auxiliary circuit and a main circuit, the latter controllable from the respective landings at which the car is to stop, for completing said circuits to said movable contacts, and electrically-controlled means for rendering all the push-button circuits inoperative while the car is in motion.

17. In an electric elevaior,a hoisting-motor, switches for controlling the circuits of said motor, electrical devices for actuating said switches, a contact device arranged in the circuit of said electrical devices, said contact device including a disk carrying insulated segments or contact-strips, cooperating contacts corresponding to the various floors at which the car is to stop, means actuated by the motor for rocking said disk, means controllable from each floor and from the car for completing circuit to said contacts, and means for breaking contact between said contacts and segments when the car reaches the particular floor corresponding to the contact which is in commission.

18. In an electric elevator,a hoisting-motor, switches for controlling the circuits of said motor, electrical devices for actuating said switches, a contact device arranged in the circuit of said electrical devices and including a disk carrying contact-segments, levers corresponding to the various floors at which the car is to stop, and carrying cooperating contact-points, means controllable from the respective landings for completing circuit to said levers, and means actuated by the motor for moving said levers to break the circuits controlled thereby.

19. In an electric elevator, a motor, means electrically controllable from any landing for setting the motor in operation, the electric controlling means being inoperative when the motor is in operation, and means actuated by the inotorfor arresting the motor when the car reaches a predetermined stopping-point.

20. In an electric elevator, a motor, electrical devices controllable from any landing for setting said motor in operation, means for rendering the controlling means of said electrical devices inoperative when the motor starts up, and means actuated by the motor for reducing the speed of the motor as the car approaches any predetermined stoppingpoint.

21. In an electric elevator, a motor, means for controlling the circuits of said motor, a series of contacts, one arrangedat each floor or landing, for completing the circuit of said motor-circuit-controlling means, and means for reducing the speed of the motor when the car approaches a pred etermined stoppingpoint.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN D. IHLDER.

\Vitu esses:

F. E. IIUBBEL'L, It. RIcHnNs.

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