US1546373A - Brush holder for commutators - Google Patents

Description

July 21, 1925.

1,546,373 A. W. FARCUS ET AL BRUSH HOLDER FOR COMMUTATORS Filed Dec. 5, 1924 2 Sheets-Sheet l J THEIR ATTORNEY July 21, 1925. "1,546,373

A. w. FARCUS ET AL BRUSH HOLDER FOR COMMUTATORS Filed Dec. 5. 1924 2 Sheets-Shoot 2 INVENTORS W 1 TNESSES A WW6 W Daw'd T Jacobs 4% I l I r I TJI'EIR ATTORNEY Patented July 21, 1925.

UNITED STATES CAD PATENT OFFICE. i

ALEXANDER W. FABCUS AND DAVID '1. JACOBS, OF PHILADELPHIA, PENNSYLVANIA.

BRUSH HOLDER FOR COMMUTA'IORS.

Application filed December 5, 1924. Serial No. 754,048.

To aZZ whom it may concern:

Be it known that we, Aiinniimncn TV. FiincUs and DAVE) T. Jixoons, citizens of the United States, residing at Philadelphia, county of Philadelphia, and State of Penin sylvania, have invented certain new and use ful Improvements in Brush Holders for Commutators, of which the following is a specification.

Our invention relates tobrush holders for commutators and more particularly to those known as the open type which have minimum sliding surface. l

The open type of commutator brush holder and brush is universally used and accepted because dustand grit cannot accumulate to cause the brush to stick. The objection to this type is that'the rush is free to shift and tilt sidewise so as to cause uneven wear on the brush and commutator and thereby enhance the danger of the brush slipping out of position and causing serious injury to the dynamo or motor.

Another objection. to this type is that when the commutator wears, the brush depends so far from the holder that the friction between the brush and the commutator causes the brush to cant or tilt out of position, thereby causing short circuiting and burning of the electrical parts. To replace the brush holders with larger ones that extend to a point near the surface of the worn commutator so that the brush will not tilt out of position, is very costly.

The objects of our invention are to provide means on a brush holder which will prevent the brush from shifting or tilting sidewise, and which may be adjusted to the proper working position as the commutator wears, thereby avoiding the uneven wear on the brush and commutator and the costly replacement of brush holders.

These objects, and other advantageous ends which will be described hereinafter, We attain in the following manner, reference being had to the accompanying drawings in which Figure 1 is a vertical section through a brush holder having my invention applied thereto, certain of the parts being shown in full,

and a plate 8 mounted on the bracket for adjustment toward and from the commutator. The plate 8 is rigidly held in adjusted position by teeth 9 on the bracket meshing with corresponding teeth 9 on the plate and screws 10 passing through slots 11, in the plate, into the bracket. Brush 4; slidably engages the outer face of the plate and is held against the commutator by spring-pressed arm 6 engaging its upper face, and against sidewise tilting or shifting by a guiding rib 12 on the plate fitting within a groove 13 in the brush.

In operation, the guiding rib 12 will keep the brush in proper vertical alignment to cause even wear on the brush and commutator and thus lengthen the usefulness of the brush and the life of the commutator. As the commutator wears, plate 8 is adjusted toward the commutator as shown in Figure 2, and thus prevents the brush from being canted and slipped out of position by the friction between it and the commutator. Plate 8 is adjusted by loosening screws 10 and bringing it down to the proper position so that the teeth on the plate will mesh with the teeth on the bracket, after which the screws are tightened to hold the plate in adjusted position.

When a brush holder and brush as above described are used, the possibility of the brush getting out of proper alignment and slipping out of position is eliminated and the costly replacement by larger brush holders is avoided.

While we have described our invention as taking a articular term t wi be under? a section on line of F igstood that the various parts may be changed without departing fromthe spirit thereof, and hence we do not limit ourselves'to the preciseconstruction set forth, but consider that we are at liberty to make such changes and alterations as fairly come within the scope ofthe appended claims.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is 1. A brush holder for commutators hav ing a brush engaging face; a brush slidably engaging the face and the commutator, and arib on the face for guiding the brush toward and from the commutator.

2. A brush holder for commutators having a brush engaging face; a bru'shhaving a groove therein slidablyengaging the face i and the commutator, and means on the face fitting within the groo e for guiding the brush toward and from the commutator.

3. Abrush holder for commutators having a brush engaging face; a brush having a groove therein slidably' engaging the face and the commutator, and a rib on the face fitting within the groove for guiding the brush toward and from'th'e commutator.

4L. A brush holder for commutators having a plate mounted: thereon for adjustment toward and from the commutator, and

a brush slidably engaging the plate and the commutator.

5. A. brush holder for commutators having an element mounted thereon for adjustment toward and from the commutator, and a brush slidably engaging the element and the commutator.

6. A brush holder for commutators having a brush engaging element mortised thereto and adapted to be adjusted from one mortised position to another, means for holding the element in a mortised position, 7

-*bracket for holding the brush in position.

8. A brush holder for commutators hava brush engaging plate mortised thereto and adapted to be adjusted fromone mortised position to another; mean'sfor holding the plate in a mortised position, and a brush slidably engaging the plate and the commutator.

9. A brush holder for commutators having a brush engaging plate mounted there? on for adjustment toward and from the com.- mutator; a brush slidably engaging the plate and the commutator, and means on the plate for guiding the brush toward. and from the commutator.

10. A brush holder for commutator-s having a brush engaging plate mounted thereon for adjustment toward and-from the commutator; a brush slidably engaging the plate and the'commutator, and a rib on the plate for guiding the brushtoward and from the commutator.

In testimony whereof we have signed our names tothis specification in the presence of two subscribing witnesses.

ALEXANDER N. FARCUS. DAVID T. JACOBS.

lVit-nesses:

liiLIZABETH GARKE, UHAS E. Por'rs.

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