US903972A - Pigtail-brush. - Google Patents

Description

L. o. H AWLBY. PIGTAIL BRUSH. APPLICATION FILED FEB. 13,1908.

Patented Nov. 17, 1908,

I l l '1m/cil fari UNITED sin'rnsPATENT OFFICE.

LEE `CARROLL OF CLEVELAND, OHIO, ASSBGNOR TO NATIONAL CARBON COMPANY,

.- or' CLEVELAND, -oHio,AooR1 omT1oN or'Nnw JERSEY. a

. Program-Bauen.

Specication of Letters Patent.

Patented Nov. 17, 1.90.8..

Application led February 18, 1906. .Serial No.`415,660. l

To all whom it may concern: .g

Beit known that I, LEE CARROLL WLEY, a citizen of the United States, re iding at Cleveland, in `the county of Cuyah' a and State of Ohio, have invented a certarndne/W Aand useful Im rovement in'Pigtail-Brushes, of which the ollowing is va full, clear, and exact description.

This invention is an improvement upon the class of electrical brushes, known to the i thoroughly efficient pig-tail brushes.

j aol differs from Van In the drawing, Figure l is a perspective view of a brush embodying the present invention.y Fig. 2 is a top end view thereof. Fig. 3 is an edge View partly in section. Fig. L is a view of that part of thel tubular braided pig-`tail,which is to be inserted in the brush, and it" shows the condition of said end after it has been manipulated into the form adapted to receive the tubular rivet. Fig. 5 is a view of the attened tubular igtail, before its end has been expande as shown in Fig.- 4. Fig. 6. is a perspective view of the tubular rivet and its .associated washers.

Referring tothe 'parts by letters A represents the brush which is preferably made of carbon -or some analogous material. Near its outer end a transverse hole a is made through' the brush -rom one face to vthe other,-said faces bein recessed as at a around the ends ofV the ole so as to receive the parts now tobe described and prevent them from projecting beyond the facesl of said brush. The notch a2 is formed in one facelofthe brush from the recess in that face to the end of the brush.

B represents the connector or ig tail. It pig-tail which has been heretofore used or this purpose in that it is a tube of fine braided copper wire.

C is a hollow rivet which is to be tightly embraced by one end of this tubularvpi'g-tall and to project from one side thereof through a hole made therein by working t'he braids of wire apart. In fact, the preferable way of introducing this rivet into the tubular pig tail is to manipulate said pig-tail into the form and condltions shown in Fig. 4. The tubular rivet is then passed into the tube through the hole in the side, and the part of the pig-tail then embracing the rivet 1s then drawn lengthwise'so as to embrace it tightly. The rivet and its embracing4v tube are then passed through the hole a in the brush, which should be as small as possible to permit them to be s'o passed. The ends of the rivet project beyond the face of both of the recesses in the sides of the brush. The two washers D, D', are passed over these projecting ends, and the ends of the tubular rivet are upset' 'tightly against these washers, as shown. The

ends of the wires of the tubular pig-tail should project just a little beyond the face of the'recess in the side bf the brush so that when the washers are drawn in by the upsetting of the rivet, the ends of said wires will be pushed back into the hole a and thereby cause a slight expansion of the diameter` of the tubular pig-tail within the hole a.

This helps to make an intimate connection between said pig-tail and the surface of said hole. The upsetting of the rivet requires endwise pressure, and this, to a suitable degrec, increases its diameter within the hole, and thereby the wires of the tubular plg-tail within said hole' are forced into close and lintimate contact with the 'wallsof said hole.

The projecting part of the pig tail, which is flattened, extends upward in the notch a?.

One of the washers D has a tail piece d whichl is extended over and against the top of the brush, where it serves as plate against which al pressure device acts to push the brush endwise against the commutator. y

Having thus described my invention, I claim:

1. The combination of a brush havin a transverse hole through it from side to side, a rivet extending through said hole and projectin pi tail which embraces the rivet within said ho e and is thereby forced Tinto intimate con- .tact with'the walls of said hole, and washers embracing the projecting ends of said rivet,- the e'nds of the rivet being'upset against said washers.'

2. The combination of a brush having a from both ends thereof, a braided.

transverse hole through it from side to side, with a pig-tail made of ne wire braided into tubular form which lies partly Within ,saidv hole and is therein distended into intimate contact With the Walls of said hole, and

,a rivet which passes through said hole and through the tubular pig-.tail therein, and through a hole in the side of the pig-tail formed by separating the strands thereof, said rivet being of such diameter that it presses the embracing pig-tail against the Walls of said hole, and the projecting ends of the rivet being upset.

3. The combination of a brush having a transverse hole through it from side to side, a braided pigtail made of ne wire braided into tubular form which. lies partly Within said rivet being of such diameter that it presses the embracing pig-tail against the Wall of said hole,and Washers embracing the projecting ends of the rivet, the ends of said I rivets belng upset against said Washers.

In testimony whereof, I hereunto affix my signature in the presence of two Witnesses. LEE CARROLL HAWLEY.

Witnesses:

GEo.,-M. SMITH, C. F. HASKINS.

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