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METHOD OF MAKING COMMUTATOR FOR REVOLVING ARMATURE

  • US 3,812,576 A
  • Filed: 10/11/1972
  • Issued: 05/28/1974
  • Est. Priority Date: 10/25/1971
  • Status: Expired due to Term
First Claim
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1. A method of making a face commutator for a revolving armature comprising the steps of a. forming a plurality of recessed portions on the internal wall of a cylindrical member having an open end with an outwardly extending flange and a bottom, said recessed portions extending down the internal wall of the cylindrical member to define commutator segments along the internal wall between adjacent ones of the recessed portions, b. forming engagement hooks on the internal surface of said cylindrical member at positions corresponding to the commutator segments, c. punching said flange to form connection risers at positions between said recessed portions, d. putting an iNsulating material into said cylindrical member at least after said recessed portion forming step and said engagement hooks forming step, said insulating material having portions extending into said recessed portions, e. removing said recessed portions of the internal wall of the cylindrical member after said insulating material putting step to expose the insulating material portions which extended into the recessed portions and which divide the wall of the cylindrical member into commutator segments, and f. forming radial dividing grooves across the bottom of the cylindrical member extending between the insulating material exposed portions to form a plurality of divided coplanar commutator segments.

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