US1226130A - Brush for electric machinery. - Google Patents

Description

E. M. SORENG.

BRUSH FOR ELECTRIC MACHINERY- APPLICATION FILED JULY 8, I912- RENEWED OCT- 10.19l4.

1,226, 1 30. Patented May 15, 1917.

ATTORNEY UNITED sTATns ATENT OFFICE- IFIDGAIB. M. SORENG, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO ALLIS-CHALMEBS MANUFACTURING COMPANY, .OF MILWAUKEE, WISCONSIN, A CORPORATION OF DELAWARE.

BRUSH FOR ELECTRIC MACHINERY.

Specification of Letters Patent.

Patented May 15, 1917.

Application filed J'uly 8, 1912', Serial No. 708,111. Renewed October 10, 1914. Serial No. 866,336.

To all whom it may concern Be it known that I, EDGAR M. SonENc, a citizen of the United States of America, and

. resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Brushes for Electric Machinery, of which the following is a specification.

My present invention relates to brushes for use on slip rings or commutators of dynamo-electric machinery, or of any machinery to which collector or feeding brushes are applicable.

It is an object of this invention to provide a brush of improved construction for electrical machinery, for engagement with a current-collecting device thereof.

It is a further object of this invention to provide a brush of improved construction for use on electrical machinery, a body portion of the brush being of conducting material and being provided with a backing of material, at least as soft as the material of the body portion ofthe brush, for increasing the rigidity of the brush so as to permit the setting of the brush in operative position relatively to a current-collecting device at a comparatively small angle to such collecting device.

These and other objects are attained by this invention, the various novel features of which will appear fromvthe description and drawings, disclosing one embodiment of such invention, and will be particularly pointed out in the-claims.

In the accompanying drawings:

Figure 1 is a side elevation of the improved brush.

Fig. 2 is an inverted plan of the same.

In the form of the invention disclosed in the drawing, the brush consists of laminae of copper wire gauze, or other comparatively good conducting material, 1, one end of which is adapted to bear on a commutator, or other current-collecting device, indicated at 2, and a comparatively thin backing of material which is at least as soft as that of the body portion of the brush, and is preferably metal and softer than the material of the body portion of the brush, 2'. e. less capable of resisting abrasion. This backing may be applied by fusing, or otherwise, to form a layer of a comparatively rigid character which acts as a reinforcing backing for the body portion of the brush and prevents any distortion thereof, even though the same may, of itself, be of a more or less flexible character. To secure the greatest advantages, the re- 1nforc1ng backing should extend to the tip of the brush, thus offering greater protection against any tendency of the tip or other portlon of the active end of the brush to curl or become distorted in any way. The backing material, being at least as soft as the conducting material of the brush, will wear away as fast as the latter and, thus, will not, 1n any way, prevent good electrical engagement between the brush and the surface of the current-collecting device.

The preferred material for the reinforcing backing of the brush is solder, which may be applied in fused condition. When thus applied, particles of the solder enter beneath the outer surface of the-brush and impregnate the same, and enter into intimate engagement with the interior particles of the conducting material of the brush. Where the backing material is not applied in fused condition, it may be so unitedv to the conducting material of the brush, as by the application of pressure, that particles of the preferably softer backing penetrate the outer surface of the brush and are intimately united with the material of the brush.

Where the conducting material of the brush is wire gauze, the same may, if desired, be rolled into convolutions and compressed to the desired shape.

It should be understood that it is not desired to be limited to the exact details of the invention shown and described, for obvious modifications will occur to a person skilled in the art.

I claim as my invention 1. A brush for electric machinery, con sisting of the combination of electric conductors, and a backing of solder connecting some of said conductors together and extending to the tip of the brush.

2. A brush for electric machinery, consisting of the combination of convolutions of a woven wire copper sheet, and a backing of solder adhering to said brush and extending to the tip thereof.

3. A brush for electric machinery, consisting of the combination of copper Wires, and solder impregnating the upper surface of the brush and extending to the tip thereof.

4. A brush for electrical machinery comprising a body portion of metal and of generally porous structure at one portion of its surface, and a reinforcing metal backing for said body portion, said backing and said body portion being intimately united along said surface portion of generally porous structure at that part of the body portion that is adapted and intended for ourrent-collecting engagement with a cooper- .ative current-collecting device.

5. A brush for electrical machinery comprising a body portion of metal, and a reinforcing, metal backing for said body portion, the material of said backing having no greater abrasion-resisting qualities than the material of the body portion, and said backing adhering to and intimately united to said body portion at the part thereof that is adapted and intended for currentcollecting engagement with a cooperative current-collecting device.

6. A brush for electrical machinery comprising a body portion of metal and having a surface portion of generally porous structure, and a reinforcing metal backing for said body portion of material at least as soft as the material of the body portion, said backing being intimately united with the body portion by having portions thereof impregnating said body portion at the surface portion of generallyporous structure.

7 A brush for electrical purposes comprising a body portion of metal fabric, and

a reinforcing metal backing for said body portion, said backing being intimately united to said body portion by impregnation of said body portion with particles of said backing.

8. A brush for electrical purposes comprising a body portion of woven metail fabric, and a reinforcing metal backing for said body portion, said backing being of material at least as soft as that of said body portion and being intimately united to said body portion by impregnation thereof with particles of said backing.

9. A brush for electrical purposes comprising a body portion made up of laminated metallic fabric, and a reinforcing metallic backing for said body portion, said backing being less capable of resisting abrasion than said body portion and adhering to and intimately united with the body portion at the part thereof normally intended for current-collecting engagement with a cooperative current-collecting device.

10. A brush for electrical purposes comprising a body portion of fabricated metal, and a reinforcing metallic backing for said body portion, said backing being of material less capable of resisting abrasion than the material of said body portion and being intimately united with said body portion at the part thereof normally intended for current-collecting engagement with a cooperative current-collecting device.

EDGAR M. SORENG.

Witnesses:

WM. A. RAUH, J. BRAUN.

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