US909889A - Electric elevator. - Google Patents

Description

HG'WARB Z GURNE'Y, OF JERSEY GETY, NEW EEI LSEE', AND WILLIAM M. GUMMISKEY, 3F EGNEQDALE, PENNSYLVANIA; Shim @UMMISKEY AWEGNQR TO SAID GURNEY.

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Application filed February 28, 3.25% (Serial No. 417,932.

tain new and useful Improvements in Electri e Elevators, of which the following is a specification. 4'

Our invention relatesto improvements in electric elevators and particularly to a novel connection of the electrical circuits used in the controllers for such apparatus, and its.

object is to increase the sa ety and eficiency of installations of this character.

W'e will describe our invention in the following specification and point out the novel 4 features thereof in claims.

The drawing is a diagrammatic re resentation of certain portions of an e evator apparatus and associated parts together with certain connected electrical circuits which are used in carrying out our invention. In this drawing and designate mains from a-suitable source of electrical supply which, after passing through a main-line switch 10, run to various parts of the apparatus through circuits which will be pointed out hereinafter.

20 is a starting switch which comprises a plurality of stationary contacts 21, 22, 23, 24, 25 and 26 and two movable contact plates 27 and 28. The latter are mounted upon but insulated from a vertically movable red 29 which is connected with the core 31 of an electromagnet or solenoid 30 by means of a rod 33; 32 designates the Winding of this solenoid.

3a is a piston atiixed to the connecting rod ,33. 35 is a closed cylinder surrounding this pistonand arranged to form an air-cushion or dash-pot for controlling the rapidity of movement of the piston 34 and its connected parts in both directions.

40 is a reversing switch which comprises stationary contacts 41, 42, 43, 44:, ;45, 46, 47 and 48 and movable contact plates 49, and 56 mounted u on but insulated from a vertical rod 51 which is directly above the rod 29. A pendant 52 is pivoted to the lower end of the rod 51 and is normally in alinement with the rod 29. It is provided with a slot 53 into which a pin 54 projects; This pin is on a rod 55, one end' of which is attached to the core 56 of a solenoid, the winding of which is designated by the numeral 57 The other end of rod 55 supports aninsulated contact plate 58'which 1S pressed a ainst two stationary contacts 60 and 61, y means of a spring 59. Whenever solenoid windin 57 1s ener 'zed the contact plate 58 wil be drawn ack against stationary contacts 62 and 63 and at the same time the pendant 52 will be drawn back into the position shown Get designates the armature of an electric motor which, in any of the well-known manneis, 15 arranged to drive a hoisting mechanisni and a car. The armature terminals .of this motor are connected by conductors 65 and 66 with stationary contacts 42 and 44, respectively. The terminals of the shunt field 67 of this armatureare connected by conductors 68 and 69 with'stationary contacts 25 and 24, respectively.

Below the solenoid 30 a brake 70 is shown. This comprises a brake-pulley 71 and a pair of brake-shoes 72 mounted upon pivoted levers 73, the upper ends of which are connected together and to a rod 36 by means of a. pair of toggle-levers 3-7. The rod 36 is affixed to the solenoid core 31 and the parts are so arranged that when the solenoid 30 is energized and the core 31 raised thereby the pivoted levers 73'will bepushed apart and the brake-shoes released thereby. "When the solenoid is deenergized the wei ht of its core and its connected parts wilf force the pivoted levers 73 together and thereby apply the brake-shoes to the ulley 71 which is connected to some movab e part of the elevator hoisting mechanism. The brake is therefore actuated by the solenoid which also-actuated the starting switch.

74, 75 are contact lates mounted upon the lorakedevers 73, a .76, 77, 78, 79 are stationary contacts with which these contact plates coect 1 v 80 is an automatic rheostat which is arranged to gradually cut a resistance 81 out of the motor armature circuit. This rheostat -conzqorises a pair of brushes 82 which bear uponand make contact with a metallic strip 83 and a plurality of stationary contacts 84. The resistance 81 is trinnected to each one of the latter so that when the brushes 82 are moved up over the stationary l in dotted lines and out of the path of movemerit of the rod 29.

contacts, the-resistance is cut out in a plurality of steps. The brushes 82 are mounted upon a vertical rod 85 which depends from the core 86 of a solenoid, the winding of which isdesignated by 87. A. iston 88 is attached to one end of the ro 85. This piston is within a closed cylinder 89 which maybe filled with oil or other fluid and is arranged to retard the upward movement of the brushes 82: A valve in the piston 88' at lows the iston and its connected, parts to move free y downward.

QjOdesignates an elevator-car within which is a manually operated switch 91 which comprises a pivoted lever 92 and two stationary contacts 93' and 9t. This lever may be moved into engagement with. either one or the other these contacts.

.Theabove description isv of the various parts of the apparatus which are connected together by a wiring system made up of a plurality of circuits which will now be traced and the operation of our invention described.

The main-line conductors and are connected by means of conductors 11 and.

12 with stationary contacts 22 and 26. A conductor 12 is run from the main to the pivoted lever 92 of vthe car-switch. If this car-switch lever is moved to the left onto contact 93, a circuit will be closed through the conductor 95, contacts 60, 61, which are bridged by plate '58, conductor 38, winding 32 of solenoid 30, and conductors 39 and 11 to the negative main. This solenoid 30 will be (Energized and will raise its core. This will cause plates 27 and 28 to be moved up against'contacts 21, 22 and 25, 26,

necessary. The core 31 will. at the same time release the brake The efiect of these operations will be to cause the motor in one direction and the car t en thereby,

'li hen the brakeshoes have been moved away from the brake pulley, the contact plates '74 and will be moved back against ually out out of the motor armature circuit under the action of the dash-pot 89. It is to be noted that this part of the operation cannot take place until the brake has been actuated and released. I

The motor and car will continue to run in one direction until the circuit through solenoid windings 32 and 87 is broken, either by some of the automatic arrangements usua ly em loyed with apparatus of this kind,

or by t e operator in the car bringing the car-switch back to its central position. This will cause the current to be cut ofi from the motor and the brake to be a plied. At the same time the brushes 82 widrop and will thereby quickly connect a part of the resistance 81 in series with the motor armature. I

the operator throws pivoted lever 92 of the car-switch to the ri ht against contact 94, the operation will e similar to that above described, except that in this case the solenoid winding 57 will lee-energized and the reversing switch 40 will cause the currentto pass throu h the motor armature in the opposite direction so that the rotation of the motor and the movement of the car will be used if desired sol, that both" rake-shoes must be released beforethe armatureresist- .ance can be removed.

The advantages of this invention are obvious. It fully insures the proper rotation of steps in the operation of the controller.

It prevents an overload upon the motor which might be caused b makin the latter work against an applied rake. it also suplies a time element during which the motor egins its rotation before its series starting resistance is cut out, which time may be augmented by the dash-pot 35.

The various apparatus shown and de= scribed are arbitrarily selected to illustrate our invention They are not a part of the present invention, nor is the eneral wiring system shown, but our invention may be applied as well to many other forms of apparatus and in conjunction with other systems of wirin Tnstea of connecting the solenoid 87 with the mains through the car-switch, its conductor 97 may be connected with stationary contact 25, and the conductor '79 connected with the stationary contact 21 so that the closing of the starting switch and thereleasing of the brake serve to complete its circuit.

What we claim is.--

1. In an elevator, an electric motor, a starting resistance therefor, an electromagnet for controlling the starting resistance a I brake, and means for preventing the completion of the circuit of the resistance-com trolling magnet while the brake is applied.

2. In an electricallycontrolled elevator, an electric motor having an armature, a starting resistance in circuit with the armature, a solenoid for gradually cutting out the startin resistance, a starting switch, a brake, an e ectroresponsive device for actuating the startin switch and the brake, a switch for contro ling said electrores onslve device, and means actuated by the re easing movement of the brake for energizing the starting resistancesolenoid.

3. In an electrically-controlled elevator, a car, an electric motor having an armature, a starting resistance in circuit with the armature, a solenoid arranged to out the starting resistance out of circuit with the motor armature, a dash-pot controlling the action of the solenoid; a motor starting switch, a brake, a pivoted brake-lever connected therewith, an electroresponsive device for actu ating the starting switch and the brakelever, a manually operated switch in the'car for controlling said electroresponsive device, and a circuit closer connected with the brake-lever arran ed to close the resistancecontrollin solenold circuit when the brakelever has een actuated to release the brake.

4. In an electrically-controlled elevator,,a car, an electric motor having an armature, a starting resistance in circuit with the armature, a solenoid arranged to cut' the starting resistance out of circuit with the motor armature step by ste a dash-pot controlling the action of the so enoid in one direction; a

motor-starting switch, a brake, a pivoted brake-lever connected therewith, an elctroresponsive device for actuating the'sta'rting switch and the brake-lever, a manually o erated switch in'the car for controlling said electroresponsive device, and'a circuit-closer connected with the brake-lever arranged to close the resistance-controlling solenoid, circuit when the brake-lever has been actuated to release the brake and when said car-switch is closed. 7 y

5; In an electrically-controlled elevator, a car, an electric motor having an armature, a starting resistance in circuit with the armature, a solenoid arranged to get the starting mature step by step, a dash-pot controlling the action of the solenoid in one direction, a motor-starting switch, a reversing switch and a brake; a solenoid arranged to actuate, the starting switch and the brake, a switch in the car for controlling said actuating solenoid, a pair of pivoted brake levers connected with the brake, and a'circuit-closer connected with each of the brake levers arranged to close the resistance-controlling solenoid circuit when the brake levers have been actuated to release the brake and when said car switch is closed.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

HOWARD F. 'GURNEY. WILLIAM M. CUMMISKEY.

Witnesses as to signature of Howard F. Gurney:

W. L. OCONNELL,

E. K. LETTLE.

Witnesses as to signature of William M. Cummiskey:

F. VALTIER, C. R. OALLAWAY.

resistance out of circuit with the motor ar-

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