Electric motor brush holder

摘要

A frame that has a central opening through it for the commutator of an electric motor is provided with a pair of brush housings, each having a passage therethrough in which a brush is slidable. One side of each housing is provided with a longitudinal slot, beside which a stud projects from the frame. The central coil of a torsion spring encircles the stud and has end portions extending laterally toward the housing, with the free ends of the spring biased toward each other. One end of the spring engages an abutment at the inner end of the housing and the opposite end of the spring extends through the housing slot and into a notch in the side of the brush to hold the brush retracted in the housing passage until the end of the spring is removed from the notch and placed against the outer end of the brush to move the inner end of the brush into commutator-engaging position.