Brush holder

Claim 2

A brush holder for holding a brush opposite to and in contact with a motor commutator, which comprises: a brush arm made of conductive and resilient material and including a brush support having a brush at its tip and a brush arm base having a first ridge section; an insulating brush arm mount provided with slits extending from a front edge portion thereof, first grooves provided in the vicinity of the central portions of said slits respectively, and second grooves provided along the side edge portions thereof and extending from the front edge portion thereof, said brush arm being removably mounted on said brush arm mount; and a case provided with a base having a bearing section for supporting a motor shaft, and sides having second ridge sections in the vicinity of the upper end portions of the internal surfaces thereof, respectively; wherein said first ridge section of said brush arm is resiliently positioned in said first grooves of said brush arm mount, respectively, to thereby mount said brush arm on said brush arm mount and wherein said second grooves of said brush arm mount are mated with said second ridge sections of said case, respectively, to thereby attach said brush arm mount to said case.

Claim 3

The brush holder as set forth in claim 1, further comprising recesses provided at the side edges of said brush arm base respectively, a projection provided in each of said slits and at the rear edge side of said brush arm mount, a third groove provided on the front edge portion of said brush arm mount, and a third ridge section provided in the vicinity of the upper edge of the internal surface of said base, wherein one of said recesses is mated with said projection, and the other of said recesses and said third groove are both mated with said third ridge section.

Claim 4

The brush holder as set forth in claim 1, further comprising a plate member provided on the upper rear edge portion of said brush arm mount.

Claim 5

The brush holder as set forth in claim 1 wherein said first ridge section is arcuate in transverse cross-section.

Claim 6

The brush holder as set forth in claim 1 wherein said second ridge sections and said second grooves are arcuate in transverse cross-section.

Claim 7

The brush holder as set forth in claim 2 further comprising a plate member provided on the upper rear edge portion of said brush arm mount.

Claim 8

In a brush holder for holding a brush opposite to and in contact with a motor commutator, the brush being mounted in a brush arm made of conductive and resilient material and including a brush support for mounting the brush at the tip thereof and a brush arm base having a first ridge section, the improvement comprising: an insulating brush arm mount having a first edge portion, slits extending from said front edge portion of said brush arm mount, first grooves provided in the vicinity of the central portions of said slits, respectively, and second grooves provided along the side edge portions thereof and extending from the front edge portion thereof, said brush arm being removably mounted on said brush arm mount; and a case provided with a base having a bearing section for supporting a motor shaft, and sides having second ridge sections in the vicinity of the upper end portions of the internal surfaces thereof, respectively; wherein said first ridge section of said brush arm is resiliently positioned in said first grooves of said brush arm mount, respectively, to thereby mount said brush arm on said brush arm mount and wherein said second grooves of said brush arm mount are mated with said second ridge sections of said case, respectively, to thereby attach said brush arm mount to said case.

Claim 9

In a brush holder for holding a brush opposite to and in contact with a motor commutator, the brush being mounted in a brush arm made of conductive and resilient material and including a brush support for mounting the brush at the tip thereof and a brush arm base having a first ridge section, the improvement comprising: an insulating brush arm mount having a first edge portion, slits extending from said front edge portion of said brush arm mount, first grooves provided in the vicinity of the central portions of said slits, respectively, and second grooves provided along the side edge portions thereof and extending from the front edge portion thereof, said brush arm being removably mounted on said brush arm mount; and a case provided with a base having a bearing section for supporting a motor shaft, and sides having second ridge sections in the vicinity of the upper end portions of the internal surfaces thereof, respectively; wherein said first ridge section of said brush arm is resiliently positioned in said first grooves of said brush arm mount, respectively, to thereby mount said brush arm on said brush arm mount and wherein said second grooves of said brush arm mount are mated with said second ridge sections of said case, respectively, to thereby attach said brush arm mount to said case.

Claim 10

The brush holder as set forth in claim 7, further including recesses provided at the side edges of said brush arm base, respectively, and wherein said improvement further comprises a projection provided in each of said slits and at the rear edge side of said brush arm mount, a third groove provided on the front edge portion of said brush arm mount, and a third ridge section provided in the vicinity of the upper edge of the internal surface of said base, wherein one of said recesses is adapted to be mated with said projection, and the other of said recesses and said third groove are both adapted to be mated with said third ridge section.

Claim 11

The brush holder as set forth in claim 7 further comprising a plate member provided on the upper rear edge portion of said brush arm mount.

Claim 12

The brush holder as set forth in claim 7 wherein said first ridge section is arcuate in transverse cross-section.

Claim 13

The brush holder as set forth in claim 7 wherein said second ridge sections and said second grooves are arcuate in transverse cross-section.

Claim 14

The brush holder as set forth in claim 8 wherein said projection, said third ridge and said second groove are arcuate in transverse cross-section.

Claim 15

The brush holder as set forth in claim 8 further comprising a plate member provided on the upper rear edge portion of said brush arm mount.