US544768A

US544768A - Electric elevator

Info

Publication number: US544768A
Authority: US
Publication date: 1895-08-20
Anticipated expiration: 1912-08-20

Description

l(No Model.)

N. 0. LINDSTROM ELECTRIC ELEVATOR. vNo. 544,768. yPatented A'ug WITN ESSES;

UNITED-:STATES,rm-@NTo1-nca;

NILs o.` LINDs'm-ton, or UNION Counsel; -AssIGNoR- To THE A; B. SEE. MANUFACTURING COMPANY; on BRooKLvN, NEW YoRK.

' Epi-:orme

EnsvAToR,

SPEOIFICATQN forming partefLettersretentir@544,7e8dtedAugust.2O,1895

' ppncnon sied Mayjia, 1895.

.To alla/hom, it may-concern: f Beit known that I, NILs O; LINDSTROM', a

citizen ot theUnited'States, residing in Union Course,`in the county of Queens 'and State of New York,` have invented certain new and useful Improvements in ElectricI Elevatorsfot which the following is a specification.' This invention relates to electrically-operated elevators.v g 3 The vobjects of the invention are to'simplify the construction of the switching-apparatus, controlling the direction of rotation -ot thel the motor, by which the field-magnet is nor-l mally kept charged ready for instant action and adapted to close the armature-circuit on itself when the switch is shifted to a stopping position, thus causing the motor to act as a .magnetic brakeand smoothly and powerfully reduce the speed of travel of the car. The continuously-closed circuitwhich maintains the field-magnet charge also acts magnetically on the controller to hold it forcibly in a position in which the armat ure-'circuit is open Vuntil by a suitable change of the car-switchit is permitted to change position and start u p the motor. f The several features of .novelty ot' `the invention will behereinafter .more fully-de;

scribed andwill be deuitely indicated-'in the claims appended to vthis specification(y In the accompanying drawing,`which diagrammatica-lly illustrates Athe inven'tiongis shown asystem embodying my improvements. Upon the elevator-car is a switch l, compris-A ing a pivotedmetallic hand-leverl provided with three tro-operating contacts-f2 3:4;prefe'rably arranged Ain an arc of a'circle over which' the lever sweeps.A The car is indicated in dotted lines and the hoisting-cable and its windv ing-drum-havebeen omitted for vcl ee'. rnessand simplicity. f

sannita. 549,492. momenti thejarmature is'closed on the `supply ci'rcuit. The contacts 2 3 4 of thecarswitchare insuswitch-lever is norm'allyin the position shown in the drawing, bearingon the-contact 3, The

ply-circuit, are grou ped in acable follow the movements of the car.

mounted to slide in `tubularbearings `formedof non-magnetic' and preferablynon-conductlenoid-cores when at eithenextremejot movement,

14 llarepresent solenoidsto control-{closswitch on one side, and with the field-magnet cores 131'37',arecompoundin character,being adapted tobe closed on lthelgarmatme-lofixlslies n 2Q 2O5arepivotedarmsjor levers, which may he counterweighted, as shown, on sprlngoperationwiththe cores 1G3f'1 3]'7as, f orexainple, by being looselyl pivotedthereto, as shown. Each lever 'carries insulated metallic brushes -whe'n th motor is open-circuited, antithe-,lastv` A set y'in series wiithfth'e m Ot0 1"when-operating.

yo l6,, the 'former of which '-is' always' incircu'it and the latter-of vwhich is on'ly-incircuit when* 55 lated from' one another and so arrangedthat; 'the switch-lever 'inpassing from 3 to 2 or 4 will not break the vield-magne't circuit.' The 6o, lever is connected with one side V'ot-a supplyfrom the car-switch tothe controlleriand supadapted t o f 13 13a. represent solenoid-cores, each 'co-operating with solenoid-coils bywhichr'theirt movement is controlled. As shown, the-'y arey ing material-such as wood, paper', or indu? rated ber-suitably supported upon a frameg work or wall, The bearings are'p'rovidfedwith Y plugs of iron to produces. firmgriponthe soa y;.

vurefot the armature-circuit, and connecting with contacts 23nd 4, respectively, of the car-Vv 8o coil'5 'on the other side. 'The shell 15 is prov vided at or nea-rits middle with a plug of iron, j

(indicated,) against which thecores 13-13jlfbear y when the Vmotor isrcut outotV circuit. f lhe. 8

5 magnetically insulatedat the ln liddle 4point by a section 31vv ljot brass oi; other hon-m'ag- V notie materialgtofperniitthe' twqino nsections of eachv core to he. separate1y-vgagnetized. fj 1 'Around. `t he shell is placedfthree coilsor actuated. These levers. are arranged, fforgcorco 21, 22, 23, ce. Brushes 21 21s @i5-operaie with contact-strips 19, 24, 19, and 24. Contactstrips 24 24* are electrically connected with i thearmature-brushes, a suitable resistance 25 being interposed in.one branch. Brushes 22 and 23 co-operate with pairs of contact-strips 26 27, 28 29, one strip of each pairconnecting with the respective armature-brushes and the other with the respective supply-wires. The brushes 21, dro., and their cci-operating contacts are similarly arranged, except that strips 27 and 28 are rcversely connected tothe armature-brushes compared with 27 28.

As thus organized, the operation of the apparatus is as follows: The field-magnet coils 5 5 and the solenoid-coils 16 16'* of the controller are normally charged, current flowing from one direct-curentmain 7 over conductor 0, switch-lever, contact 3, conductor 1l, coils 16 16, and field-magnet coils 5 5` to the opposite main 8. This results in severalim' portant functions: First, it keeps the ileldmagnet chargedand yields a high-instantaneous counter-electromotive force in the motor when the armature is cut. into circuit; second, it permits the motor to actas a brake in stopping by reason ot the charged iield, and, third, it operates the controller to out ol the lsupply of current from the mains to the armature and positively holds the controller in such position until the switch lever in the car is actuated. When the attendant desires to start the car, he operates the handswitch so as to connectA with contact 2 or 4, one of which determines ascending and the other descending motion. If contact 2 be energized, solenoid 14 is rendered active, the in- .egrity'of the iield-magnet being constantly preserved. The solenoid draws in core 13 and ythrows the controller-switch, bringing brushes 22 23 into engagement with contactstrips 26 and 27 and 28 29, respectively. Cnrrent is thereby thrown into the armature at its lower brush from main 7, contact-strips 29 28, armatnre-coils,.rheostat 30, contact-strips 27 26, controller-coils 18 18, series field-magnet coiltf to opposite main 8. The seriescoil 6 Ga'consists of a few turnsof coarse wire i wound in a direction to increase the ction'of ,the shunt-coil 5 5 in producing a strong starting-torque. Ii an opposite direction of cartravel be desired, contact 4 will be energized by the car-attendant, thus energizing solenoid 14* of the controller and reversing the armature-circuit by cutting in contact-strips 26* 27,&c., which lead current through the armature by way of its upper brush. It will be noted that when the motoris running in either direction-that is to say, when its armature l is drawingcurrentfrom the mains-controllercoils 18 18* are energized and therefore lock the idle side of the controller. Thisconstruction also prevents a sudden reversal of the motor by a quick throw of the hand-switch by the car-attendant, for if said switch be quickly thrown from, say, contact2 to contact 4 core` 13 cannot be shifted by its solenoid 14* until the motor has smoothlystoppec, for after dea-energizing coil 14 core 13 is shifted by its counterweight and puts the motorarmature on closed circuit through contacts i `19 24 and coils 17 17, the motor then acting as a generator, and the latter coilsmagnetically lock core 13* until the car and the motor have stopped, when current ceases in the closed local circuit and core 135` isfree to obey solenoid 14 and reverses the circuit by v ,down the car.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. An electric elevator comprising a car, a driving electric motor, a switch on 'the car forcontrolliug its direction of travel, and

meansfor placing the motor on closed circuit and maintaining its field-magnet charged aiter the switchhas been operated to cut it out of circuit.

2. An electric elevator comprising a car, a i

driving electric motor, a circuit-controller for reversing the motor circuits, and a switch on the car and connections for normally maintaining the' motor field-magnet charged.

, 3. An electrichelevator comprising a car, a driving electric motor,- a magnetically operated'circuit-controller for reversing the armature circuit, a switch on the car, connections i for maintaining the motor field-magnet constantly charged, and a switch operated by the controller for placing the motor armature on closed circuit when the motor is cutout.

4. An electric elevator comprising a car, a driving electric motor, a. magnetically operated circuit-controller for reversing the motor, a switch on the car for operating the controlle'r, and means for magnetically locking the controller against a sudden reversing movement. i -4 5. An electric elevator comprisinga car, a driving electric motor, two independently actuated circuit-cpntrolling switches, a switch on 4the car for operating either circuit-controlling device, and means for magnetically locking one circuit-controlling device while the other connects the motor in circuit. v

6. An electric elevator comprising a car, a`

'coils for shifting4 the circuit-controller, each coil being in series with the field-magnet, and

-a car-switch normally completing the fieldmagnet circuit and adapted to cut inl either controller-coil.

7. An electric elevator comprising a car, n

driving electric motor, a circuit-controller atI or near the motor, solenoids 14, 14, acarswitch for cutting in either solenoid, and locking coils`18, 18.*in circuit when the'motor is operating, cooperating with the solenoid cores when in their normal position.

. 8.- An electric Aelevator comprising 'a car, a driving electricmotor, a circnit-controlir at 1 out and cooperating with the solenoid cores lof whenvvin' their normal position. n i

l y' .9.; An .electric elevator comprising a car, a driving electric motor," 'avn'orniallycharged ieldfmagnet coiland an' auxiliary I ield-m'ag`- net coih wound toas'sist .the main -coil, said auxiliary coil being 'out into circuit lwhen the motor starts into operation A 10. An electric' elevator comprising a car, a

' `driving electric tnotor, a circuit-controller at or near the motor, solenoids 14, 14, controllerswitches operated by the cores of the selenoids,a retractile agency to normally hold thel switches open, and auxiliary coils `for magnetically locking either of the solenoid cores. or. near the. "motor, solenoids 14, .142e carswitch for cutting in .either solenoid, locking.4 coils`17, 17a in circui\`.-,whenftheV motor is cut 11. A controller comprising two compound cores 13,13a having theirmernbers magnetica117 insulated from each other, solenoid coils 14, 14:a cooperatingv with onev member, and auxiliary solenoids cooperating with the other member. i l

In testimonywhereof I have hereunto subk 3o scribed my name this 10th day of May, A; D, 1895.

' NILS O. LINDSTROM.

Witnesses:

D. A. MASON, PHILIP KOMPFF, Jr.