US692121A - Alternating-current motor. - Google Patents

Description

Patented 1an. 28, 49,02.

u. E. couLsoN..

ALTEHNATINGCURRENT MOTOR.

(Application led Mar. 2, 1901,.)

(NQ Model.)

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UNITE DAVID E. COULSON, OF GALESBURG, ILLINOIS, ASSIGNOR OF ONE-IIALF TO KIMSEY T. RICHARDS, OF GALESBURG, ILLINOIS.

ALTERNATING==CURRENT MOTOR.

SPECIFICATION forming part of Letters Patent No. 692,121, dated January i538, 1902. Application ledMarch 2, 1901. Serial No. 49,642. (No model.)

To LEZ whom t may concern.-

Be it known that I, DAVID E. OOULSON, a citizen of the United States, residing at Galesburg, in the county of Knox and State of Illi. nois, have invented certain new and useful Improvements in Alternating Current` Motors, of which the following is a specification.

The present invention relates to means for opening the circuit of the starting or torque coils of an alternating motor after the armature has attained the desired velocity.

The object of the invention is to provide a device of simple and efiicient construction which will automatically accomplish this and which will also automatically reestablish or close the circuit when the motor stops, so that it will be in readiness for operation when the current is again turned on. This object I accomplish by means of brushes which are yieldingl y held in contact with the segments of the cominutator and which are carried by the armature-shaft through the vmedium of devices that will permit them to be thrown outward by centrifugal force, and thus open the circuit of the starting-coils when the desired velocity is attained.

The invention consists in the features of novelty that are hereinafter described, with reference to the accompanying drawings, which are made a part hereof, and in which- Figure l is a sectional elevation of a portion of an alternating motor, the section being taken in the axial plane of the armatureshaft. Fig. 2 is a section thereof on the'li'ne 2 2, Fig. 1, looking in the direction of the arrow.

A represents the armature-shaft, to which is non-rotatively secured, by means of an insulated key A, a pulley B, an insulatingring O being interposed between them, said pulley being grooved to receive abelt or cord, through the medium of which the power of the motor is applied. To the extended periphery b of the pulley are secured a pair of pins D,v which extend inward toward the armature shaft and are radial with respect thereto. These pins enter sockets in brushes E, the t between the pins and brushes being sufliciently loose to permit the brushes to slide freely upon the pins. Surrounding the pins are coiled springs F, whichbear at their inner ends against the brushes and at their outer ends against collars G, which are adjustably secured to the pins by means of setscrews g, wherebythe tension of the springs may be regulated. These springs hold the brushes yieldingly in contact with the segments of the coinmutator-ring, said commutator being here shown as formed in two segmentsH H', which are secured to a sleeve I through the medium of insulated screws J, said commutator-rin g being further insulated from the sleeve I by an insulating-ring K. The sleeve I telescopes with a tubular extension b of the armature'casing L and is secured thereto by means of set-screws t. The terminals M M of the starting or torque coils are connected to the commutator-segments H H', respectively, and Vfor this purpose they are preferably passed through perforations formed through the sleeve lI,the insulatingringK,and the commutator-segments, their ends being clamped beneath the heads of screws h,tapped into said segments, the latter being preferably counterbored in order to receive the heads of the screws. With this arrangement while the motor is at rest the circuit including the starting or torque coils is completed through the terminal M, the commutator-segment H, the brushes E, the pins D, and the pulley B. When the current is turned on, the circuit will remain closed through these parts until the desired velocity is attained, whereupon the brushes E willbe thrown out of contact with the commutatorfsegments by centrifugal force, andv this same force will maintain them out of contact until the motor stops or its speed is reduced to such an extent that ythe centrifugal force will not overcome the resistance of thesprings F. When this condition is attained, the circuit of the starting or torqueV coils will again be closed through the parts above enumerated.

For the purposes of this application I have illustrated a form of the invention which is adapted to be made and sold as a separate article of manufacture and applied to motors at present in use; but I desire to have it understood that my invention is not limited thereto. On the contrary, it contemplates any arrangement of the elements above de# scribed that will accomplish the result aimed ssl IOC

at, and in the building of motors embodying the invention the supports for the brushes Will preferably be carried by the armature rather than by the driving-pulley.

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

1. In a motor, the combination with the terminals of the starting or torque coils,the commutator-segments with which they are connected and the armature-shaft, of brushes arranged outside of the eommutator-segments and movable toward and from them, means carried by the armature-shaft and in turn carrying and electrically connecting the brushes, and means for yieldingly holding the brushes in contact with the segments, whereby they will be moved out of contact with said segments by centrifugal force, substantially as set forth.

2. In a motor, the combination With the terminals of the starting or torque coils, the commutator-segments with which they are connected and the armature-shaft, of brushes arranged in operative relation to said segments, pins upon which said brushes are slidably mounted, means carried by the armatureshaft and carrying said pins, and means for yieldingly holding said brushes in contact with the comm utator-segm ents, substantially as set forth.

3. In a motor, the combination With the terminals ofthe starting or torque coils, the commutator-segments with which they are connected and the armature-shaft, of brushes arranged outside of said segments and movable toward and from them, means carried by the armature-shaft and carrying said brushes, and means foryieldinglyholding said brushes in contact With the segments, said brushes being electrically connected through the medium of the means by which they are carried, substantially as set forth.

4. In a motor, the combination with the terminals of the starting or torque coils, the commutator-segments with which they are electrically connected, and the armature-shaft, of brushes arranged outside of said segments and movable toward and from them, means carrying and electrically connecting said brushes, said means being in turn carried by the armature-shaft, and means for yieldingly holding the brushes in contact with the cornmutator-segments, substantially as set forth.

5. In a motor, the combination with the terminals of the starting or torque coils, the commutator-segments and the armature-shaft, of brushes arranged in operative relation to said segments, pins upon which said brushes are adapted to slide toward and from the segments, said pins being disposed radially with respect to the armature-shaft, means carried by the armature-shaft and in turn carrying said pins, and means for yieldingly holding said brushes in contact With the segments, substantially as set forth.

6. In a motor, the combination with the ter-` minals of the starting or torque coils, and the armature-shaft, of brushes arranged in operative relation to said segments, pins upon which said brushes are slidably mounted,said pins being disposed radially with respect to the armature-shaft, coiled springs surrounding the pins and engaging the brushes,adj ustable collars carried by the pins and engaging the springs, whereby they may be adjusted, and means carried by the armature-shaft and in turn carrying said pins, substantially as set forth.

7. In a motor, the combination with the terminals of the starting or torque coils,the commutator-segments with which they are electrically connected, and the armature-shaft, of a sleeve to which the segments are secured, means forinsulat-ing the sleeve and segments, brushes arranged outside of the segments, and movable toward and from them, means carrying the brushes and in turn carried by the armature-shaft, and means for yieldingly holding the brushes in contact with the segments, substantially as set forth.

8. In a motor, the combination with the terminals of the starting or torque coils, the commutator-segments and the armature-shaft, of brushes arranged outside of the segments and movable toward and from them, a pulley non-rotatively mounted upon the armatureshaft, means for insulating the pulley from the shaft, means carried by the pulley and in turn carrying the brushes, the brushes being electrically connected through the pulley,and means for yieldingly holding the brushes in contact with the segments, substantially as set forth.

DAVID E. COULSON.

Vitnesses:

L. M. HOPKINS, A. L. CRAIG.

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