Metal working – Method of mechanical manufacture – Electrical device making
Patent
1991-06-25
1992-10-13
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
228258, 427431, H01R 4306
Patent
active
051539799
ABSTRACT:
A plate-like material is rounded in the form of a cylinder so as to form a main body of a commutator to which an end of a winding for an armature coil of an electric motor is electrically connected, and both ends of the plate-like material are opposed to each other so as to define a joint portion therebetween. When a molten soldering material is introduced into the joint portion and solidified therein, the joint point is closed by the soldering material, thereby making it possible to mold the main body of the commutator, which is shaped substantially in the form of a jointless cylinder. The commutator can be easily fabricated and the manufacturing cost thereof can also be reduced as compared with a case where the main body of the commutator is fabricated from a pipe-shaped material. Since the joint portion can reliably be closed, resin used to charge the inside of the main body of the commutator therewith at a subsequent step can be prevented from extruding toward the outside of the main body.
REFERENCES:
patent: 3958326 (1976-05-01), Matsumoto et al.
Japanese Patent Application Laid-Open No. 63-265548.
Japanese Patent Application Laid-Open No. 63-265549.
Asmo Co. Ltd.
Hall Carl E.
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