Appeal No. 2001-0648
Application No. 07/702,615
brush assembly. The brush assembly has support arms being
connected in parallel and each arm carries a respective brush
body, each body contacting a motor commutator. The support arms
have different respective resiliencies and are made of different
materials so as to have different frequencies. Such an
arrangement is alleged to provide for an improved electrical
contact since, at a motor resonant frequency corresponding to a
resonant frequency of one brush, the motor speed resonant
frequency will not correspond to the resonant frequency of the
other brush and the other brush will be less likely to lose
contact with the commutator.
Representative independent claim 48 is reproduced as
follows:
48. An electric motor brush assembly for being mounted in a
DC electric motor, comprising:
first and second resilient, electrically conductive support
arms arranged for being axially spaced from each other with
respect to a longitudinal axis of said DC electric motor when
said assembly is mounted in the motor,
the support arms being connected electrically in parallel,
each arm carrying a respective brush body, said brush bodies
being arranged for contacting a generally cylindrical commutator
of the motor,
the commutator having a plurality of circumferential
2–
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