Title: Brushes for rotating electric machines

Abstract: For use with an electrical machine, a contact brush is provided which comprises a solid "carbon" block having a thin layer of electrically conductive, preferably carbon, fibers on a surface which contains the entering edge, or a surface which contains the leaving edge, or both such surfaces. The fibers have free ends contacting the relatively-moving counterface, e.g. a slip ring or commutator, close to the entering or leaving edge, thereby to provide near the respective edge a large number of contact points to obtain sparkless operation.

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Inventors: Cunningham, James (Glamorgan, WA, US)

Application Number: 315781
Filing Date: 1972-12-18
Publication_date: 1976-09-14
Assignee: Morganite Carbon Limited (EN)
Primary Class(es): 310/251
Other Classes:
US Patent Ref:

573105	Dec, 1896	Raymond	310/248.
716252	Dec, 1902	Laughlin	310/248.
2300503	Nov, 1942	Hamister	310/248.
2739255	Mar, 1956	Shobert	310/251.
2870353	Jan, 1959	Shobert	310/248.
3303370	Feb, 1967	Boes	310/252.
3509400	Apr, 1970	Conrath	310/248.

Other Refs: 573,9551,057,580745,673

Apr, 1959	CA
Mar, 1954	FR
May, 1944	DD

Primary Examiner: Skudy, R.
Assistant Examiner:
Attorney: Larson, Taylor and Hinds