Brush assembly for a portable electric tool

Claim 1

A brush assembly for a power tool comprising: a. a clam shell housing having a first housing portion and a second housing portion interconnected to each other to define a mating line therebetween, b. the clam shell housing formed of dielectric material, c. a universal motor mounted in the clam shell housing having an armature shaft journaled therein, d. a commutator affixed to the armature shaft and operatively connected to the motor, e. a radial brush aperture in superposition to the commutator and being formed at the mating line to extend into both the first and the second housing portions, f. the brush aperture has a lower section with a slot extending between a pair of spaced shoulders formed in the lower section, g. the brush aperture has an upper section disposed radially above the lower section, and the upper section formed with threads therein and being externally accessible, h. one of the shoulders formed at the juncture of the upper and lower sections of the brush aperture, i. the other shoulder formed on the underside of the lower section of the brush aperture, j. a metallic tube affixed in the slot of the brush aperture, k. a pair of spaced transverse tabs formed on the metallic tube, one tab to engage the upper shoulder and one tab to engage the lower shoulder to prevent radial movement of the tube in the brUsh aperture, l. means on the tube at the underside of the slot to electrically connect the brush assembly in circuit with the motor, m. a brush insertable into the brush aperture to be radially slidable in the tube and adapted to operatively engage the commutator, n. a coil spring carried on the brush, and o. a cap threadedly connected to the upper section of the aperture to compress the spring and urge the brush to engage the commutator.