Mounting for brushes of electric motors

Abstract From the Canadian patent

A small electric motor includes a wound rotor or armature, a segmented commutator and brushes biased lengthwise against the commutator for providing a circuit through which the armature is energized. Each brush is part of an assembly that also includes a conducting brush tube from which the brush extends and, an insulating tube in which the brush tube is frictionally held. Aligned pivot projections extend transversely from opposite sides of the insulating tube and are received by recesses in the motor frame The recess walls provide bearing formations that are engaged by the pivot projections to cooperate therewith so that during mounting of the insulating tube and elements assembled …