US361973A - Ebnest p - Google Patents

Description

(No Model.) I

E. P. WARNER.

COMMUTATOR FOR DYNAMO ELEGTRIG MACHINES NO. 361,973.

Patented Apr. 26, 1887.

u. D. C.

UNITED STAT S PATENT OFFICE.

ERNEST P. NVARNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE WVESTERN ELECTRIC COMPANY, OF SAME PLACE.

- COMMUTATOR FR DYNAMO-ELECTRIC MACHINES.

SPECIPICATION orming part o`f Letters Patent No. 361373, dated April 26, 1887.

Application filed September 9,1886. Serial Ne. 213.178. (No model.)

To all whom it may concerm Be it known that 1, ERNEST P. VVARNER, a citizen of the United States, residing at Ohicago, in the County of Cook and State of Illinois, have invented a -certain new and useful Improvement in Commutators for Dynamo- Electric Machines, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forning a part of this speeification.

My invention relates to the construction of the commutators of dynano-electric machines; and it consists in forming the center piece or hub of metal, preferably brass, about which an insulatingring, preferably of blocks' of wood bound together, is formed. The segments are attached to the outside of the insulatingring, as hereinafter described.

My invention will be readily understood by reference to the accompanying drawings, in whichv Figure 1 is an outside end view of the commutator removed from its shaft. Fig. 2 is a longitudinal section thereof upon line X X of Fig. 1. Fig. 3 is an inner end elevation showing the manner of attaching the wire to the segments. Fig. 4 is an enlarged sectional View of one of the bands which bind together the blocks which make up the insulating-ring.

Like parts are indicated by similar letters of reference in the different figures.

The hub or center piece, a, is preferably formed of brass, and is preferably provided with grooves b, which may be formed by means of a milling-maehine. The blocks c are inserted in these grooves, as shown, and each Secured to the hub by a screw, d. I have shown butone of the screws din the drawings. Each screw d is deeply countersunk, as shown, and the space above plugged up with wood or other insulating material. After the pieces c are thus each secured in place the wooden wedges e are driven in and glued between the difi'erent blocks, so as to form a continuous insulatingring. Other insulating material might be used instead of wood. The partiallyformed commutator is then placed in alathe, and grooves f, preferably three in number, are formed therein, and at the same time the outer surface is rendered truly cylindrical and prepared to receive the metal shell. I then wind a band,

g, preferably of brass, about the wood in each of the grooves, and over the metallic bands I wind tightly wire, preferably brass. The wire thus wound on under tension is soldered to the underlying bands in the different grooves. I then cover the wire with insulating-tape, and about the tape I bind strong thread. Any

'other suitable baud or hoop might be used.

A shell of metal is then slipped over the outside of the wood, and secured thereto by woodscrews. I insert the screws through the shell, so that there may be four screws in each of the blocks c, as shown in Fig. 2, in order that when the shell is divided into segments each segment may be firmly held in place. The shell thus placed over and Secured to the insulatingring is divided into segments, a milling-nachine being used'for this purpose.

The slots or divisions between the different segments h should be of sufficient width to insulate the segments from one another.

The wires leading from the armature may be attached to the different segments h of the commutator by binding-screws z', as shown in Figs. 2 and 3.

The slots formed by the milling-machine are filled with wcoden blocks Ic, as shown, and then about the circunference I place the removable metallic segments l. These piecesl are a little wider than the underlying segments h. The blocks k are thus securely held in place.

Commutators thus constructed may be used upon different styles of dynamo-electric machines, and are of greater strength, more durable, and less liable to become impaircd or injured than any commutators for dynamoeleetric machines with which I am familiar.

In case the entire center is of wood, as heretofore, the commutator is almost sure to become tight upon the shaft, so that it can be removed only with great difficulty.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination, with the center of hub a, of the wooden ring formed of blocks, and the segments attached to said ring, substantially as shown and described.

2. The combination, with the center piece Ioo provided with grooves, of the blocks inserted i thereto and bound together, and the segnents supported by said nsulating-ring, substantially as shown and described.

3. The eombination, in a eonnutator, of 5 the segnents h, sepamted by bloeks k, and the external removable segments, Z, wder than the underlying segments 71 whereby said bloeks k a'e retaiued in place, substzmtiallyas described. 4. In a commutator, the bloeks c, each se- IO cured to the hub, and the wedges e, glued be tween said bloeks to form therewith :L wooden insulating-ring for supporting the segments, and the bands bonnd t'ghtly in grooves provided in said insulating-ring, substantally as 15 shown and described.

ERNEST P. ARNER witnesses:

GEORGE P. BARTON, CIIAS. A. J osLYN, J

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