US819195A - Electric elevator. - Google Patents

Description

PATENTED MAY 1, "1906/ P. WRIGHT.

ELECTRIC ELEVATOR.

APPLICATION FILED JAN.19,.1905.

.4 SHEBTSSHEBT 1.

w @WWMM PATENTED MAY 1, 1906.

P. WRIGHT. ELECTRIC ELEVATOR.

APPLICATION FILED JAN. 19, 1905.

4 SHEETS-SHEET 2.

[Ill/613226 MN m ml EN 7 No. 819,195. I I PATENTED MAY 1, 1906.

' P. WRIGHT.

ELECTRIC ELEVATOR.

APPLICATION FILED JAN. 19. 1905.

4 SHEETS-SHEET 3.

@ATENTED MAY 1, 1906.

P. WRIGHT} ELECTRIC ELEVATOR. APPLICATION FILED JAN. 19, 1905.

4 SHEETS-SHEET 4.

PATENT oFFIon.

PARVIN WRIGHT, OF LOS ANGELES, CALIFORNIA.

ELECTFLZ'IC ELEVATOR,

Specification of Letters Patent.

katented May 1, 1906.

Application filed January 19, 1905. Serial No. 241,742.

To all learn it may concern:

Be it known that I, PARVIN WRIGHT, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Electric Elevators, of which the following is a specification.

The main object of this invention is to provide an electric-elevator system of great economy and efficiency in operation.

.A further object of the invention is to provide-for convenient and efiective control of the operation of the elevator.

Another object of the invention is to provide means for. safeguarding the system against any possibility of injury thereto by sudden reversal of the controller or reversing switch.

Another object of this invention isto provide in an elevator system ofthis character,

improved means for automatically arresting the movement of the elevator when it reaches the limit of its travel in either direction.

Another object of the invention is to provide in an elevator system of this character means for arresting the movement of the elevator and generally for throwing the system out of operation upon occurrence of a slack cableby the sticking of the elevator in its descent.

Another object of the invention is to provide means for the gradual and smooth'starting of the elevator in operation.

Another object of the invention is to provide in an elevator system of this character im roved braking means for the elevator.

in additional object of the invention is to provide for gradual deenergization of the motor-field, thereby avoiding possibility of injury to the insulation by the self-induction discharge from the field-magnet.

The elevator-operating system herein showncomprises the following elements: cable mechanism connected to operate the elevator, an electric motor connected to operate said cable mechanism, operating-circuit connections for said motor,- controlling means on the elevator cab or cage, and electromagneticall -operated controllingidevices adjacent to t e motor and controlling its operation and responsive to and controlled by the con-.

troller in the e1evator'-cage. Said electromagnetic controlling devices comprise a main switch operated electromagnetically to close the'main circuit of the motor, a rheostatic device operated electromagnetically to gradually cut out resistance in the motor-circuit, and reversing-switches operated electromagnetically to reverse the circuit connections of the motor.

The present invention relates in part to the special construction of these electromagnetic controlling devices with a view to their more eflective operation, simplicity of construc tion, and freedom from liability to injury by arcing. 4

The system is so arranged that when the motor is cut off from the main circuit the motor is connected in a closed circuit, including an electromagnetic brake, the motor acting as a generator to partially hold off the brake or retard the braking action. I

The invention comprises safeguarding means for the electromagnetic reversing devices, preventing the motor from being connected to the line for reverse operation until the braking action is completed and the elevator is brought substantially to a full stop, thus preventing any liability of burning out the motor or injuiing the system by throwing the line-current on an armature generating electromotive force in the same direction and also preventing the possibility of the violent reverse start that would result from such an o oration.

The systeml ui-ther comprises certain improvements in the braking devices. The system also comprises circuit-controlling means, herein termed limit-switches, for disconnecting the system when the elevator reaches its upper or lower limit or movement.

The system also comprises a switch controlled by the elevator-cable and operated on slacking of the cable to disconnect the controlling system from the line. I

The accompanying drawings illustrate the. invention.

Figure '1 is a side elevation of the cabledrum and rnotor and the electromagnetic controlling devices therefor. Fig. 2 is adetail section on the line X X in Fig. 1. Fig. 3 is a side view of the electromagnetic con-. trolling devices. Figgi is a partly-sectional front view thereof. Fig. 5 is a side elevation, partly in section, of the electromagnetic rake, this view being taken on the line X X in Fig. 1. Fig. 6 is a section on the line X too X in Fig. 5. Fig. 7 is an inside elevation,

partly in section, of part of the cable-drum,

. consisting of a bar on said stem carrying inshowing the slack cable circuit-controllers. Fig. 8 is a lan of said circuit-controller. Fig. 9 is a si e elevation of the upper part of the electromagnetic controlling devices for the motor on the opposite side from Fig; 3. Fig. is a diagram of the circuit connections.

1 designates a suitable base or frame on which are mounted the cable-winding d1 um 2, the electric motor 3, and the electromagnetic controlling,devices mounted on a case or board 4. I

The cable-drum 2 is operated from the shaft 5 of the motor 3 in any suitable manner for example, by wormgearing-- (indicated at 6,) and the cable 7 passes over and around said drum and under the guide-sheave 8 in the usual manner.

9 designates a brake device operating on the drum-shaft 5, said brake device operating automatically to arrest the movement of the elevator when the motor is not in operation.

The motor 3 may be of any usual or suitable type, but is preferably compound-wound. Said motor is controlled to start and stop the elevator by means of a controller or reversing switch in the elevator-cab, said controllerswitch (indicated at 10 in Fig. 10) being a double-throw or two-way switch, acting through the controlling circuits on the electromagnetic. controlling means. Said electromagnetic means comprises electromagnetic switch-operating devices 11 11, preferably solenoids, adapted to respond, respectively, to the reverse operations of the controllerswitch aforesaid to close the motor-circuit for revolution in one or the other direction, the device 11 controllin the upward novement of the elevator and the device 11 controlling the downward movement thereof.

The electromagnetic controlling means further comprises an electromagnetic device 20, preferably a solenoid, for the starting train and rheostatic switch devices to establish and control or regulate the current to the n".oto:', so as to prevent excessive flow of current in starting and to give an easy starting movement.

The electromagnetic reverse controllers are substantially duplicates of each other, the up controller comprising a solenoid with a main or operating coil 12 and an auxiliary retaining-coil 13, said coils acting conjointly on a core 14, connected by its stem 0'; rod to operate the switch 21, said switch sulated contacts 16 17, adapted when the bar is raised to engage fixed contacts 18 19, connected in the motorcircuit, as hereinafter set forth.

The down controller similarly con.- prises a solenoid with main and auxiliary .as hereinafter set forth.

coils 12 13 and core 14, with stem 15, carrying switch-bar 21 and insulated contacts 16 17 thereon, adapted to engage fixed contacts 18 19, also connected to the 111otor-circuit.

Main coils 12 and 12 are connected in the maincontrolling-circuits and are sufficiently powerful to lift the respective cores on closure of the corresponding circuit. The auxiliary coils 13 13 are connected in shunt-circuit with the motor-armature and are responsive to the electromotive condition of the armature or practically to the rotary movement of the armature, said coils acting to retain the switches in operated condition, Means are provided whereby when one switch is so retained in operativ'e position the electromagnetic contro ling means for the other switch is open-circuited or otherwise rendered incapable of response to the elevator controller switch. For this purpose the switches 21 and 21 may carry or control switch-contacts 22 22, connected by strip 22 and engaging fixed contacts 23 23 to cl se the circuit leadin to the coil 12 or 12 of 1 other'controlling evice.

The switch-cor! ts 22 and 23 are connected in circuit with the solenoid-coil 12, and when switch-bar 21 is down or in inoper ative or open position its contacts 22 rest on the contacts 23 and keep the circuit of .coil 12 closed. Similarly, switch 11 when down or open keeps the circuit of coil 12 closed.

The switch-bar 21 and arm thereof may be of insulating material, so as to insulate the various contacts carried and operated thereby. Switch 21 and switch-contacts 22 are of similar construction to switch 21 and contact 22, respectively.

24 24 designate buHer-springs surrounding stems 15 15" and engaging between arms 25 on bars 21 21 and core members 27 27,

, fixed in the upper ends of the solenoids, these springs serving to give an easy cushion-stop to the switch as it dro s. Arms 25 also engage and slide on gui e-rods 28 to hold the switch-bars 21 21" in alinement with the fixed contacts.

The starting-rheostat device comprises a solenoid 20, operating a main switch 29 and also operating rheostat contacts 30, said rheostat-contacts being preferably a series of resilientlysupported contacts respectively connected to resistance-sections 31, and said contacts being movable to bring two or more of them into electric connection to shortcir cuit one, two, or more sections of the resistance.

The main switch may consist of a bar carrying contacts 32 33, adapted to engage when raised with fixed contacts 34 35 on the board 4. Contacts 32 33 are electrically connected by connection32 Said main switch-bar is operated and carried by the stem or rod 37 of a core 37 for solenoid 20, and a buffer- 'ried by a pair of parallel leaf-springs or spring-arms 42, which normally hold the contacts in extended or separated position and which will yield by a parallel linear movement to allow the contacts to be pressed to ether. Such operationof the contacts is efected by an arm 43, extending from the stem or rod 44 on the core 44 of solenoid 20. The

two cores 37 and 44 are preferably concentric, the core 44 telescoping within the core 37. This movement of the contacts is arrested and retarded by suitable retarding means, preferably a dash-pot 36, whose iston 41 is perforated, as at 41 a'.dasherp ate 38 on the rod 44* being also perforated with perforations 38 smaller than the perforations 41*. The top contact 30 is fixed on a bracket 30*. bottom of the dash-pot, and when'the rod 44 starts to rise it will move freely a small distance until the plate 38 strikes the piston and moves up with it.

All of the contacts of the switches 21 and 21, main switch 27, and rheostat-contact means 25 are desirably provided with carbon terminals 45, which may be supported in suitable sockets or holders 46.

The brake device, Figs. 5 and 6, comprises a standard 48 on base 1, lever 49 50, pivoted on said standard and carrying the brakeshoes 51, spring means 52 engaging said levers to press the shoes on a wheel 53 on drumshaft 5, and electromagnets 54 55, mounted on the respective levers 49 in position to mutually attract each other when either or both are energized, as hereinafter set forth,

such attraction causing the shoe-carrying arms of levers 49 50 to be moved further apart and releasing the braking-grip of the shoes on wheel 53, according to the strength of the magnet energization. Magnet 54 is connected 1n the controlling-circuit and magnet 55 in the motor-shunt circuit. Brakeshoes 51 are preferably mounted on levers 49 50 by a ball-and-socket bearing 56. 53 designates an ihsulating-cou ling between the motor and cable-drum sha ts.

The limit-switches, Figs. 1 and 2, are mounted on an insulating-board 58 adjacent -to the cable-drum, the upper limit-switch comprising a series of contacts 59 6O 61 and a pivoted switch-lever 62 to engage simultaneously therewith and the lower limit-switch comprising corresponding members 59 60 61 62. Levers 62 and 62' have toes 63 63 extending in the path of pins 64 64", carried by gear-wheel 65, which is engaged by a pinion 66, fast on the cable-drum shaft 5. Pins Normally piston 41- rests at the .64 64 are circumferentially adjustable ion wheel 65, said pins, for example, being mounted in any one of two series of holes 68 68 on said wheel. When the elevator approaches or reaches the upper end of the elevator-shaft, pin 64 will engage toe 63 to open switch-lever 62, and when the elevator is at or near its lowermost position the pin 64 similarly opens'switch 62, these switches being connected to open'the respective circuits controlling the motor-circuits for downward and upward operation, respectively.

The slack-cable circuit-controller (see Figs.

7 and 8) consists of a lever 70, pivoted on a support 71, so that the cross arm or bar 72 on the'end of said lever extends under the sevv eral rounds or layers of the cable in the drum, and a contact-arm 73, rigidly connected to lever and carrying a contact-spring bridge 73*, engaging fixed contacts 74, to normally close the controlling-circuit, a counterweight 75 on lever ,7 0, tending to hold the circuit closed, but yielding on the springing out of the cable due to the slackening thereof, so as to cause the circuit to be broken. The electric connections lead from the line or supply-circuit wires (indicated at 78 79) as followszFrom line 78 through a Wire 81, in cluding a resistance 80, to starting and main switch solenoid 20, thence by Wire 82 to brake-coil 54, wire .83 to contacts 74 73*, wire 84 to switch 10; from one of the contacts 110 of the switch by wire 85 to coil 12, from which Wire 86 leads to contact 60 of the up limit-switch, and from contact 61 thereof wire 88 leads to brake-coil 55, connected by wire 89 to series field-coil 9O ofthe motor, which is connected to Wire 79. A connection 86 leads from coil 12 to switch-contact 23.. Main switch-contact 34 is connected to line-wire 78, and contact 35 is connected by wire 91 with the series of resistancesections 31, from which wire 92 leads to reversing-switch contact 18. From contact 16 wire 93' leads to contact 17 of switch 21, and Wire 94 leads therefrom to one side of the motor-armature95. Wire 96 leads from the other side of the armature to contact 17 of switch 21. From corresponding contact 19 Wire 97 leads to contact 59 of the up limitswitch. A connection leads from wire 91 by Wire 98 to coil 13 of solenoid 11, thence by wire 99 to coil 13, and thence by wire 100 to one end of shunt field-coil 101 of the motor, connected at the other end to line-wire 79. Wire 92 is also connected to switch-contact 18 of the other reversing-switch, and the connections of said switch are completed by wires 93 9,7 in such manner as to lead the current in a reverse direction through the motor-armature. The connections to mov-' ing-contacts 16 17 16 17 may be made by flexible conductors 102. The operation of the system is as follows: Normally or when the elevator is at rest the circuits are open, controller-circuit being open at switch 29, as well as switch 21 21'. Both upper and lower limit-switches 62 62 will normally be closed, as will also slack-cable switch 73, leaving the controlling-circuit in condition to respond to the operation of the elevator-cab switch 10. All of the electromagnetic controlling devices will be denergized and the motor will be inoperative; but the brake will be in action, due to denergization of the releasing-magnets thereof, so that the elevator-cab will be held in fixed position. 'To start the elevator up, the switch is thrown over to contact 110 thus establishing the up controlling circuit as follows: from line-wire 7 8 through wire 81, resistance 80, solenoid 20, wire 82, brake-coil 54, wire 83, slack-cable switch-.contacts 74 73, wire 84, switch 10, contact 110, wire 85, up solenoid 12, wire 86, switch-contacts 23 22, wire 87, contact of the up limit-switch, switchblade 62, contact 61, bar 88, brake-coil 55, wire 89, series field-coil 90 of the motor to the other side of the line at 79. The current flowing in this circuit will energize the solenoid 20, drawing up the core 38 and closing switch 29, and the coil 12 of the reversingsolenoid 11 will draw up its core 14, closing the switch 21. The closure of these two switches 29 and 21 establishes the motor-circuit as follows: from wire 78 to contact 34, thence by contacts 32 33 of switch 29 to contact 35, wire 91, resistance 31, wire 92, contacts 18 16 of switch 21, wires 93 94, armature 95, wire 96, contacts 17 19 of switch 21,

wire 97, contact 59,blade 62, and contact 61 of the up limit-switch, wire 88, brake-coil 55,

wire 89, series field-coil 99 to the other side of the line at 79. The current flowing in this circuit energizes and sets in operation the motor, the entire resistance 26 being at first included in this circuit, but is gradually cut out by the elevation of internal core 44 of solenoid 20, the lowermost contact 30 bein first brought against the second contact an on further movement the second contact being raised to engage the third, and so on, eachclosure' between adjacent contacts cutting out one section of resistance, its movement being retarded by the dash-pot means 36 38 41, so as to give a gradual acceleration to the motor and prevent undue flowof current therein in starting. The field-magnet of the motor is energized by the series fieldcoil in the circuit above traced and also. by

' shunt field-coil 101, the circuit of which is traced. as follows: from line wire 78, as above, to wire 91 thence by wire 98 to coil 13 and solenoid 11, wire 99,'coil 13, wire 100, shunt field-coil 101 of the motor to the other side of the line. 7 9.

It will be noted that the controlling-circuit at this time energizes brake-magnet 54,

while the motor-circuit energizes brake-magnet 55, so that the mutual attraction of these motor will then propel the elevator upwardly until the controller-switch 10 is moved-to open position, as shown in Fig. 10, thereby breaking the controller-circuit and denergizing solenoid 20, allowing the switch 29 to all in open position. This will break the line connection to the motor; but the armature thereof will still be on closed circuit and will act 'as a generator sending a current backwardly through the closed local circuit.

The operated switch 21 will not fall or open, for the reason that it is held up by the shunt-coil 13, which is energized first by a connection from the line and then when the line connection is broken by this regenerative current from the motor-armature, said current passing from the armature through wires 94 93, switch-contacts16 -18, wire 92, resistance 31, wire 98, solenoid-coil 13, wire 99, solenoid-coil 13, wire 100, shunt field-coil 101, series field-coil 90, wire 89, brake-coil 55, contact 61, switch-arm 62, contact 59, wire 97, and switch-contacts 19 17, and wire 96 to the other side of the armature. The energization of the brake-ma net 55 will cause partial continuance of t c release of the brake, so that the braking action will be gradually exerted, ,it being understood that the releasing action'due to said coil 55, alone is much less than when the coils 55 and .54 are acting conjointly. As a result the motor will gradually slow down, and as its speed diminishes the energization of the magnet 55 will decrease, with a resulting increase in the braking action, until the motor is brought to a standstill and the elevator is stopped. The regenerative current will at this time cease to flow, and the solenoid-coil 13 will then be deenergized, allowing the core 14 to drop to open switch 21. The system is thus restored to a normal condition and is ready for operation to again start the elevator either up or down, as may be desired. If while the elevator is moving in one direction-for example, upwardly the attendant should throw the controller-switch 10 clear over to establish a connection for moving the motor downwardly, such connection'will not be immediately operated in, but themotor will first be brought to a standstill, and the safety devices for reversing switch for such connection will then be operated'to establish the connection. If we assume the elevator to be moving upwardly, switch 21 will be in raised position and contact 22, controlled thereby, willbe out of engagement with the contact 23, thereby opening or disconnecting the controllingcircuit for the down solenoid 12. If then the attendant moves the switch-lever 10 over to the down'contact 110, the first effect will be simply that due to breakin the connection with the contact 110, w ich acts, as above explained, to cause the main switch '29 to open, putting the IYlOf-OIOIl closed cir claims and gradually slowing up and stopping the motor, whereupon the switch 21 W1ll drop and open the local circuit of the motor and closing contact 22 on the contact 23, thus establishing a connection through down controlling-magnet coil 12"and to the controllercircuit 1 12, so that connection established at the latter contact by the attendant will then become operative to effect reverse movement of the motor and down movement of the-elevator.

The invention is not confined to the specific apparatus and connections shown, as the same may be varied considerably to meet different requirements. Thus the energizing connections for the retaining-coils 13 13 may .be connected to receive current from the armature in any suitable manner.

What I claim is 1. In combination with an electric elevator-motor, a brake therefor, a controllingcircuit for the motor, means operated by said controlling-circuit to control the brake, a circuit for the motor independent of the controlling-circuit, and means operated by said independent circuit to control the brake. 2. In combination with an electric elevator-motor, a brake therefor, a controllingcircuit, a switch operated thereby to control the motor, connections for establishing a closed circuit for the motor independent of said switch, electromagnetic means operated by the controlling-circuit for releasing the brake, and electromagnetic means operated by said independent circuit for releasing the brake.

3. In combination with an electric elevator-motor, a brake therefor, an energizingcircuit, a main switch in said circuit and switches and reversing connections establishing reversely-operating circuits irom the energizing-circuit to the motor, a controllingcircuit comprising means for operating said 2 switches, means controlled by the operation of the reversing-switches to establish a closed circuit for the motor independent of the energizing-circuit, electromagnetic means in said closed circuit operating on. the reversing means to hold the same in operated position and electromagnetic means in said closed cir- 1 ling-circuit comprising means for operating cuit operating to release the brake.

4. In combination with an electric motor, a brake theretor, an energizing circuit, a

main switch in said circuit and switches and 5 reversing connections establishing reverselyoperating circuits from the energizingmircuit to the motor, a controlling-circuit comprising means for operating said switches, 'ineans controlled by the operation of the reversingswitches to establish a closed circuit for the motor independent of the energizing-circuit, electromagnetic means in said closed circuit operating on the reversing means to hold the same in operated position, electromagnetic means in said closed circuit operating to reling said circuit, electromagnetic operating means for said switch comprising a coil for operating the switch and a coil for retaining the switch in operative position, a controlling-circuit including said operating-coil, and a closed circuit including the armature of the electric motor and the said retaining-coil.

6. In combination with an electric motor and its operating-circuit, a switch controlling said circuit, electromagnet operating means for said switch comprising a coil for operating the switch and a coil for retaining the switch in operative position, a controlling-circuit includin said operating-coil, and a closed circuit inc uding the armature of the electric motor and the said retaining-coil, said last-named circuit being independent of the motor-operating circuit.

7. In combination with an electric'eleva tor-motor, a brake therefor, an energizingcircuit, a main switch in said circuit and switches and reversing connections establishing inversely-operating circuits from the energizing-circuit to the motor, a controllingcircuit comprising means for operatingsaid switches, means controlled by the operation of the reversing-switches to establish a closed circuit for the motor independent of the energizing-circuit, electromagnetic means in said closed circuit operating on the reversing means to hold the same in operated position, electromagnetic means in said closed circuit operating to release the brake, and electromagnetic means in the controllingcircuit also operating to release the brake.

' 8. In combination with an electric elevator-motor, a brake therefor, an energizingcircuit, a main switch in said circuit and switches and reversing connections establishing reversely-operating circuits from the energizing-circuit to the motor, a controlsaid switches, means controlled by the operation of the reversing-switches to establish a closed circuit for the motor independent of the ener izing-circuit, electromagnetic means in said cIosed circuit operating on the reversing means to hold the same in operated position, electromagnetic means in said closed circuit operating to release the brake, and

' limit-switches controlled by the movement of the elevator to break the respective controlling-circuit connections when the elevator reaches its limit of movement in either direction.

9. In combination with an electric elevator motor, a brake therefor, an energizingcircuit, a main switch in said circult and switches and reversing connections establishing reversely-operating circuits from the energizing-circuit to the motor, a controllingcircuit comprising means for operating said switches, means controlled by the operation of the reversing-switches to establish a closed circuit for the motor independent of the ener iZing-circuit, electromagnetic means 1n said closed circuit operating on the reversing means to hold the same in operated position,- electromagnetic means in said closed circuit operating to release the brake, and limitswitches controlled by the movement of the elevator to break the respective controlling and brake circuit connections when the elevator reaches its limit of movement in either direction. I

10. In combination with an electric elevator-motor, a cable-winding drum and a cable thereon, a brake for the motor, an energizing-circuit, a main switch in said circuit and switches and reversing connections estab lishing reversely-operating circuits from the energizing-circuit to the motor, a controllingcircuit comprising means for operating said switches, means controlled by the operation of the reversing-switches to establish a cl osed circuit for the motor independent of the energizing circuit, electromagnetic means in said closed circuit operating on the reversing means to hold, the same in operated position, electromagnetic means in said closed circuit operating to release the brake, and a switch controlled by the cable to open the controlling-circuit on occurrence of a slack cable.

11. In combination with an electric elevatormotor, a cable-winding drum and a cable thereon, a brake for the motor, an energizingcircuit, a main switch in said circuit and switches and reversing connections establishing reversely-operating circuits from the energizing-circuit to the motor, a controllingcircuit comprising means for operating said switches, means controlled by the operation of the reversing-switches toestablish a closed circuit for the motor independent of the energizingcircuit, electromagnetic means in said closed circuit operating on the reversing means to hold the same in operatedrposition, electromagnetic means in said closed circuit operating to release the brake, and a switch controlled by the cable to open the controlling and brake circuits on occurrence of a slack cable.

12. In an electric elevator system, a rheostatic device comprising a plurality of springcontact devices arranged side by side and mounted to have a parallel linear movement toward and from one another, resistances connected to said contacts, an operat.- ig-solenoid, a core therefor, an arm connected to said core and engaging one of said contacts to press the contacts together, each of said contact devices com rising two parallel springs fixed atone en and carrying the contact means at their other end.

13. In combination with an electric motor and its operating-circuit, switches controlling said operating-circuit to operate the motor in reverse directions, retaining means 'for each switch to hold same in operative position, and means responsive to, and operated by, the movement of the motor to control said switch-retaining means.

14. In combination with an electric motor and its operating-circuit, switches controlling said operating-circuit to operate the motor in reverse directions, electromagnetic devices holding said switches in operative position, and a controlling connection with said operating devices to the armature of the motor to retain the switches in operated position while the motor is in motion.

' 15. In combination with an electric motor and its operating-circuit, switches connected to said circuit to control the operation of the motor in'reverse directions, means controlled by the operation of each of said switches to prevent operation of the other switch, and means for retaining the switches in operated position, said means being responsive to, and operated by the movement of the motor.

16. In combination with an electric motor and its operatingcircuit, and electric operating rheostatic switch devices controlling the resistance of said circuit, electromagneticallyoperated switch devices for reversing the connections of the motor to said circuit, means retaining said reversing-switches in operated position independently of the operation of the electromagnetic'device, and switch means controlled by each of the reversing-switches to render inoperative the operative connections for the other reversing-switch.

17. In an electric elevator system, an electric operating-motor, a starting-switch for the motor comprising main and rheostatic switches and asolenoid having a core connected to operate the main switch and a supplemental core connected to operate the rheostatic switch, said cores extending into the solenoid from the same end thereof and subject to attraction by the solenoid in the same direction.

18,,- In an electric elevator system, an electric operating-motor, a starting-switch for the motor comprising main and rheostatic switches and a solenoid having a core connected to operate the main switch, and a supplemental core connected to operate the rheostatic switch, one of said cores telescoping within the other, said cores extending into the solenoid from the same end thereof and subject to attraction by the solenoid in the same direction.

19. In an electrical elevator system, the combination'with a motor of a rheostatic switch therefor comprising a plurality of spring-supported contacts normally held in separate positions, resistance connections to the contacts, a solenoid having a removable core and an arm connected to said core. to engage with one of the contacts to press the contacts successively into conducting connections, said cores extending into the solenoid from the same end thereof and subject to attraction by the solenoid in the same direction. 20. In an electric elevator system, the combination with a motor, a rheostatic switch for the motor comprising a lurality of spring-supported contacts normal y held in separate positions,'resistance connections to. the contacts, a solenoid having a movable core and an armconnected to sa1d core to engage with one of the contacts to press the contacts successively into conducting connection, and a dash-pot connected to said arm.

21. In an electric elevator system, the combination with a motor, of a rheostatic switch for the motor comprisinga plurality of spring-supported contacts normally held in separate positions, resistance connections 'to the contacts, a solenoid having a movable core and an arm connected to said core to engage with one of the contacts to press the contacts successively into conducting connection, a dash-pot connected to said arm, rovided with a piston-valve movable to a low free movement of the arm in one direction to allow the contacts to separate and to retard the movement in the opposite direction.

22. In combination with an electric motor, a brake therefor, and two electromagnets operating conjointly on the brake and on one another, and a controlling-circuit for the motor including both of said electromagnets.

23. In combination with an electric motor, a brake therefor,mutually-attractive electro magnetic devices acting conjointly on said bra e to release the same, an operating-circuit for the motor including both of said electromagnetic devices, and a closed circuit including the armature of the motor and one of said electromagnetic brakereleasing devices.

24. In combination with an electric motor, a brake therefor, a circuit for the motor having an operating line connection, electromagnetic means actin on the brake to release the same, and a close circuit including the armature of the electric motor and said electromagnetic releasing means, said closed circuit being independent of the operating line connection for themotor.

25. In combination with an electric motor and its operating-circuit, an electromagnetic operating-switch controlling said operatingcircuit, the controlling-circuit including the electromagnetic operating means for said switch, and a field-coil of the motor.

26. In combination with an electric motor, a brake therefor, electromagnetic releasing means for the brake, an operatin -circuit for the motor, an electromagnetical -operated switch in said circuit, a controlling-circuit including the electromagnetic o crating means for said switch and a field-col of the motor, and electromagnetic releasing means for the brake having an energizing-coil included in said controlling-circuit, and an energizing- I coil included in the motor-operating circuit.

27. In combination with an electric motor, a brake therefor, electromagnetic releasing means for the brake, an operatin circuit for switch in said circuit, a controlling-circuit in- -the motor, an electromagnetical operated cludingthe electromagnetic o crating means for said switch and a field-col of the motor, and electromagnetic releasing means for the brake having an energizing-coil included in said controlling-circuit, and an energizing coil included in the operating-circuit and also in the controlling-circuit.

In testimony whereof I have hereunto set my hand, at Los Angeles, California, this 27th day of December, 1904.

PARVIN WRIGHT.

In presence of- A. P. KNIGHT, JULIA TOWNSEND.

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