Metal working – Method of mechanical manufacture – Electrical device making
Patent
1988-03-09
1990-05-01
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
310 43, 310234, 310236, H01R 4308
Patent
active
049206338
ABSTRACT:
A commutator shell suitable for receiving a molded commutator core is fabricated by providing an elongated ribbon of electrically conductive material. The ribbon is passed through a set of rollers to form a plurality of relatively shallow preliminary grooves of a given width longitudinally on one side of the ribbon to partially displace the conductive material. The ribbon is passed through a subsequent set of rollers to form the preliminary grooves to a full depth and to completely displace the material to a width substantially equal to that of the preliminary grooves to form the predetermined pattern of grooves between adjacent ribs. The ribbon is passed through a further set of rollers to form valleys in the tops of the ribs and to divide the ribs into dove-tailed cross-sections overhanging adjacent grooves. A length of the rolled ribbon is severed and shaped into an annular form so that the rib and groove pattern is on the inside thereof for anchoring to a core of insulating material molded inside the annular groove.
REFERENCES:
patent: 3140414 (1964-07-01), Skjodt et al.
patent: 3376443 (1968-04-01), McColl
Hall Carl E.
Resinoid Engineering Corporation
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