Patent · US Expired

Method of manufacturing carbon brushes for electrical machines

US3933687A · kind A · utility

0Cited by

3References

5Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Walter Holl · Stuttgart, DE
Martin Scholpp · Stuttgart, DE

Key dates

Filing date	Jan 23, 1974
Grant date	Jan 20, 1976
Priority date	—
Expiry date	Jan 23, 1994

Classification

Technology area (CPC H)Electricity
CPC primaryH01R43/12
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.