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

• Current Assignee: Terumoto Yamaguchi
• Original Assignee: Terumoto Yamaguchi
• Inventors: Yamaguchi, Terumoto
• Primary Examiner(s): Lanham, Charles W.
• Assistant Examiner(s): Hall, Carl E.
• Application Number:
  US05/299,609
• Time in Patent Office: 594 Days
• Field of Search: 29/597,63C 310/233,234,235,237
• US Class Current: 29/597
• CPC Class Codes: H01R 43/08 in which segments are not separated until after assembly
• CPC Class Codes: Y10T 29/49011 Commutator or slip ring assembly

Abstract

A method of making a commutator for a revolving armature which has a surface to be in contact with a brush is perpendicular to the shaft of the armature is improved. Recessed portions are formed on the internal surface of a cylindrical member having an open end with an outwardly extending flange and a bottom. The recessed portions are removed after insulating material is filled in the cylindrical member. The cylindrical member made of conductive material is divided into commutator segments by grooves which extend through holes formed by removing the recessed portions after filling the insulating material.

Claims

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.

2. Method of making a face commutator for a revolving armature as defined in claim 1 wherein said cylindrical member having an open end with an outwardly extending flange and a bottom is made by pressing a metal plate.

3. Method of making a face commutator for a revolving armature as defined in claim 1 wherein said bottom has an opening at the central portion thereof.

4. Method of making a commutator for a revolving armature as defined in claim 3 wherein said cylindrical member having an open end with an outwardly extending flange and a bottom having an opening at the central portion thereof is made by pressing a metal cylindrical element.

5. Method of making a commutator for a revolving armature as defined in claim 1 further comprising the step of forming radial bridge portions on the bottom of said cylindrical member after said recessed portion forming step.