Patent ID: 7732971

Claim:
A carbon brush holder comprising: an insulated housing having a through hole with a first section and a second section, which has a larger diameter than a diameter of the first section such that a stepped portion is formed between the first section and the second section, wherein two slots are provided on an inner wall of the first section, each of the slots has an end open at the stepped portion, and an internal thread is provided on an inner wall of the second section; and a carbon brush-holding member, which has a first end face and a second end face opposite to the first end face, and two rectangular blocks projected from an outer side thereof, inserted into the first section of the through hole of the insulated housing with the rectangular blocks engaged with the slots of the insulated housing, wherein each of the rectangular blocks has two parallel lateral sides projected from an outer side of the carbon brush-holding member and a top side on a top thereof, wherein each of the rectangular blocks has two beveled surfaces at junctions of the lateral sides, the top side, and the second end face, respectively, and wherein the beveled surfaces are received in the second section of the through hole of the insulated housing to form a gap between each of the beveled surfaces of the carbon brush-holding member and the internal thread of the second section of the through hole of the insulated housing.