Title: Method of manufacturing carbon brushes for electrical machines

Abstract: A binder consisting of an aromatic polymeric material in which aryl groups are connected together by single-bond linkages over one or more atoms of carbon, sulfur, oxygen, nitrogen, phosphorus or silicon, preferably polyphenylene-sulfide, is mixed with carbon particles, with or without the addition of copper powder and the mixture is then pressed in a mold, removed from the mold, and sintered at a temperature of 300-500.degree.C, preferably about 350.degree.C for about an hour. Even without the presence of metal powder such brushes have qualities comparable to brushes cut from carbon plate material and conventional copper-containing brushes, and have substantially longer life than the former.

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Inventors: Holl, Walter (Stuttgart, DT)
Scholpp, Martin (Stuttgart, DT)

Application Number: 435959
Filing Date: 1974-01-23
Publication_date: 1976-01-20
Assignee: Robert Bosch G.m.b.H. (Stuttgart, DT)
Primary Class(es): 252/511 252/503, 252/510, 264/104, 264/105
Other Classes:
US Patent Ref:

2224724	Dec, 1940	Elsey	252/511.
3697450	Oct, 1972	Takenaka et al.	252/511.
3716609	Feb, 1973	Trocciola et al.	264/111.

Other Refs:
Primary Examiner: Padgett, Benjamin R.
Assistant Examiner: Parr, E. Suzanne
Attorney: Woodward; William R.