Device for indicating wear on a motor brush

Details Device for indicating wear on a motor brush Device for indicating wear on a motor brush

1996-11-27

1998-05-19

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310238, 310239, 310245, 310246, 310247, H01R 3938, H02K 1300

Patent

active

057539952

ABSTRACT:
To inform a user of wear on a carbon brush for a motor earlier than when the carbon brush is actually required to be replaced with a new brush. In a motor brush wear indicating device, a metal terminal is attached to a brush holder, being opposed to the inside of a holder shank of the brush holder, and an indicator is operated when the metal terminal contacts a brush spring. The metal terminal has a contact in the middle of a length of the brush holder. The indicator can be operated while the carbon brush is continuously pressed against a commutator by the brush spring. The metal terminal serves as a leaf spring. When the carbon brush is worn and shortened, the indicator is operated. Even after the indicator operates, the carbon brush is still pressed against the commutator by the brush spring. Therefore, the user can operate a motor-driven tool for some time before the carbon brush must be replaced with a new one.

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