Metal working – Method of mechanical manufacture – Electrical device making
Patent
1976-08-25
1977-07-19
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
29424, 310236, 427125, 427126, 427357, H01R 4308
Patent
active
040359085
ABSTRACT:
In manufacturing an electric motor commutator which includes a cylindrical insulator having an axial bore for receiving the shaft of an electric motor, and a plurality of segments of commutator metal, such as, copper, extending about the outer circumferential surface of the insulator and being spaced apart by axially extending slots opening radially outward from the insulator between confronting surfaces of adjacent segments; the circumferential surfaces of the segments are shielded, as by plating the same with a metal other than the commutator metal, such as, silver, nickel, tin or zinc, or by coating such circumferential surfaces with a paint, whereupon, the resulting commutator assembly is oxidized so that only the confronting surfaces of the segments between which the slots are defined are covered with insulating layers of copper oxide, and then the shielding, along with any oxide that may have been formed thereon, is removed from the circumferential surfaces of the segments for exposing the copper or other commutator metal at such circumferential surfaces. Preferably, the commutator segments are formed by cutting the slots in a sleeve of the commutator metal which extends around the cylindrical insulator, with the cutting of the slots being effected after the outer circumferential surface of the sleeve has had the shielding, that is, the metal plating or paint, applied thereto.
REFERENCES:
patent: 1768654 (1930-07-01), Apple
patent: 3103060 (1963-09-01), Fay
Hukui Koichiro
Inoue Norikatsu
Ishi Hirohisa
Eslinger Lewis H.
Hall Carl E.
Sinderbrand Alvin
Sony Corporation
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