| 摘要 |
<p>A small electric motor (10) includes a wound rotor or armature (23), a segmented commutator (24) and brushes (31,31) biased lengthwise against the commutator (24) for providing a circuit through which the armature(23) is energized. Each brush (31) is part of an assembly that also includes a conducting brush tube (60) from which the brush (31) extends, and an insulating tube (30) in which the brush tube (60) is frictionally held. Aligned pivot projections (58,59) extend transversely from opposite sides of the insulating tube (30) and are received by recesses (94,95) in the motor frame (16,17,22). The walls of recesses (94,95) provide bearing formations that are engaged by the pivot projections (58,59) to cooperate therewith so that during mounting of the insulating tube (30) and elements (31,60) assembled therewith, the insulating tube (30) is pivoted from an oblique intermediate position (phantom in Figure 6) to a final operating position (solid line in Figure 6). A single screw (90) threadably engaged in the motor frame (16, 17,22) locks the insulating tube (30) in this final operating position. Tightening of this screw (90) generates a wedging action that stabilizes the insulating tube (30) in its final operating position.</p> |
