Sheet metal casing for a small electric motor

A method for manufacturing a yoke of a small electric motor comprising:

• forming an oval shaped tubular housing having a pair of oppositely disposed flat portions and a pair of arcuate portions disposed between said flat portions by bending a rectangular metal plate provided with jagged faces on oppositely disposed edge portions thereof to be engaged with each other and by engaging the jagged faces of the rectangular metallic plate with the engaged jagged faces being disposed in one of said arcuate portions;
• burring an end portion of said oval shaped tubular housing in an axial direction thereof for forming a bendable tab and a contact face while simultaneously securing the engaged jagged faces of said oval shaped tubular housing to each other by axial compression;
• locating an end cap with an oval shaped flange on said contact face provided on the end portion of said oval shaped tubular housing;
• and
• securing said end cap to said oval shaped tubular housing by bending said bendable tap provided on said end portion of said oval shaped tubular housing over said flange of said end cap.

A method for manufacturing a yoke of a small electric motor comprising:

• forming a tubular housing by bending a rectangular metal plate provided with jagged faces on oppositely disposed edge portions thereof and by engaging the jagged faces with each other;
• burring an end portion of said tubular housing in an axial direction thereof for forming a bendable tab and a contact face thereon while simultaneously securing the engaged jagged faces to each other by axial compression;
• locating an end cap with a flange on said contact face;
• and
• securing said end cap to said tubular housing by bending said bendable tab over said flange.