US531070A

US531070A - Controlling device for elevators

Info

Publication number: US531070A
Authority: US
Publication date: 1894-12-18
Anticipated expiration: 1911-12-18

Description

(No Model.)

A. B. SEE & W. L. TYLER. CONTROLLING nnvm; FOR ELEVATORS.

No. 531,070. Patented Dec. 18, 1894.

o EU

UNITED STATES PATENT OFFICE.

ALONZO 13. SEE AND WALTER L. TYLER, OF BROOKLYN, NE\V YORK.

CONTROLLING DEVICE FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 531,070, dated December 18, 1894.

Application filed August 24, 1894. Serial No. 521,186. (No model.)

To allwhom it may concern.-

Be it known that we, ALONZO B. SEE and WALTER L. TYLER, citizens of the United States, residing in Brooklyn, in the county of Kings and State of New York, have invented certainnew and useful Improvements in ElectricElevators, of which the following is a specification.

This invention relates to electric elevators and has for its object to provide for an easy starting of an elevator and to permit the speed and direction of movement to be varied by control of a switch on the car.

In carrying out our invention we mount on the car a controller or switch provided with a series of contacts for reversing or varying the speed, said contacts leading through a flexible cable to a motor in the basement or other part of a building, where are also placed the regulating devices for controlling the speed of the motor.

The several features of novelty of the invention will be more particularly hereinafter explained, and will be definitely indicated in the claims appended to this specification.

In the accompanying drawing, which illustrates the invention, is shown diagrammatically a system embodying our improvements.

A represents a controller or switch mounted upon a suitable insulating plate or frame in the car, but which, for convenience of illustration, is shown outside of the car. The controller is provided with a pivoted lever electrically connected with one of the electric mains 1, 2, through a flexible cable leading from the car.

The switch lever is provided with two contact shoes 3, 4, the former of which is electrically connected with the body of the lever, and the latter of which is insulated therefrom. Contact shoe 3 co-operates with contact studs 5 and 6, the former of which controls the circuit of a solenoid 7, and the lat ter of a solenoid 8.

All conductors leading from the controller A may be grouped into a cable of sufficient length to connect with the motor apparatus and permit free movement of the car.

The cores of the solenoids 7, 8 are hinged to a metallic reversing bar 9, 9 on opposite sides of itspivot, the two arms 9, 9 beinginsulated from each other. The bar is normally maintained in a horizontal position, or a position in which the motor is open-circuited, by a weight 10 suitably supported on opposite sides of the pivot. The reversing bar is pivotally connected with the circuitclosing arm 11 in such a way that a movement of the bar in either direction will close the circuit.

The circuit-closing arm 11 carries at its outer end two metallic bridge-plates insulated from each other, which, when depressed, electrically connect contact-

plates

12, 12 and 13, 13,

plates

12 and 13 being connected with the two sides of the supply main. The controller A is also provided with contacts 1%, 15 which may be bridged by plate 4 in either direction of its movement.

Stop-pins 16, 16 are provided to limit the movement of the controller lever. Contacts 14, 15 are the terminals of a normally open shunt around the armature of a motor 17, said shunt including a solenoid 18 for regulating the speed of the motor. The core of this solenoid controls an arm 19 co-operating with a series of resistances, by which, when the solenoid is energized, resistance will be cut into the fieldmagnet circuit of the motor and thus weaken the field and permit the motor to take a higher speed.

A solenoid 20, connected across the two supply conductors and normally open at contact-

plates

13, 13, is provided with a dashpot 21, which, when the circuit is closed, retards the upward movement of the solenoid core and permits a lever 22 to slowly cut resistance out of the armature circuit and thus accelerate the speed of the car.

The operation of the invention will now be understood.

The attendant first shifts the switch to contact 5 or 6 according to the desired direction of travel, and in doing so closes the circuit from the positive main through the controller lever to, say, contact stud 6, and through solenoid 8 to the negative main. The left arm of the reversing bar 9 will then be depressed into contact with plate 23 and the right arm lifted into engagement with contact 24*. Simultaneously therewith circuitclosing arm 11 will be depressed and the con- IOC contact-plate 25 with which the right arm of the reversing bar is in contact, thence through the right arm of the reversing bar 9, thence to contact-plate 24:, lever 22, resistance, the armature of the motor, contact-plate 23 with which the arm 9 of the reversing bar is in contact, across the arm 9 to contact-plate 25,

thence to contact-plate 12 and across the bridge-plate 12 to 12 and back to the negative main. Simultaneously with the. closure of the motor circuits the solenoid 20 is brought into circuit by the bridge-plate engaging contact-

plates

13, 13. The resistance in the armature circuit is therefore gradually cut out and the speed of the motor increased. The employment of the dash-pot 21 and the resistance controlled by lever 22 insures a slow start of the motor and prevents aburning out of its coils by giving it time to start up and acquire sufficient counter electro motiveforce to insure its safety. A continued move ment of the controller lever, however, by the attendant will bridge contacts 14,15 and cut into circuit solenoid 18 which is in a shunt around the armature and will therefore not draw sufficient current to actuate its switch until the armature has attained considerable counter electro motive-force. When, however, sufiicient current is shunted through the solenoid 18 to actuate its core, resistance is gradually cut into the field circuit, weakening the magnetization and permitting the armature to gradually attain a still higher speed. On the other hand, in bringing the elevator to a stop the switch on being thrown away from contact 14 or 15 immediately increases the strength of the field by cutting the solenoid 18 out of circuit and permitting the lever 19 to cut out resistance, thereby slowing down the motor before the armature circuit is opened and gradually bringing the motor to a stop. As will be seen, in the normal position of the arm 19 there is no extra resistance in the field-magnet circuit.

Should the attendant desire to reverse the direction of travel of the motor he will throw his lever to the left, thus first engaging stud 5 and bringing solenoid 7 into action, producing a reverse tilt of the switch arm 9, 9 which closes the motor circuit but reverses the direction of current through the armature in a manner which will be clearly understood upon examination of the drawing.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. An electric elevator provided with a normally open-circuited driving shunt-wound motor, a controller mounted on the car, connections for closing the circuit when the controller is operated and gradually increasing the speed of the motor, and a circuit-closing device on the elevator for gradually varying the resistance of the field-magnet circuit.

2. An electric elevator provided with a stationary shunt-Wound motor, a magnetically controlled reversing switch and circ nit-closer at or near the motor, a resistance in the armature circuit, a regulator for gradually cutting it out, a regulator for gradually varying the resistance of the field-magnet circuit, and a controller mounted on the car provided with contacts for controlling the reversing switch, the circuit-closer and the fieldmagnet resistance.

3. An electric elevator provided with a stationary shunt-wound electric motor, a circuitcloser and reversing switch at or near the motor, a controller mounted on the car, electrical connections for operating the switch and circuit-closer, a gradually variable resistance in the armature and field-magnet circuits, respectively and solenoids for successively operating them and thereby varying the motor speed when the controller is manipulated.

In testimony whereof we have hereunto subscribed our names.

New York, August 1, 1894.

ALONZO B. SEE. WALTER L. TYLER.

Witnesses:

R0131. H. READ, HENRY W. EATON.