Metal working – Method of mechanical manufacture – Electrical device making
Patent
1979-02-28
1982-01-12
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
310 40MM, 310 42, 310 89, H02K 1514
Patent
active
043098150
ABSTRACT:
A housing for a small electrical machine, particularly a small electric motor, forms a part of the magnetic circuit of the same and is composed of a cylindrical wall of a magnetoconductive material and a sheet-metal strip which is also constituted by a magnetoconductive material and is bent about the cylindrical wall. A method of manufacturing of the housing includes the steps of bending a sheet-metal band so as to form the cylindrical wall, and bending the sheet-metal strip about the thus-bent sheet-metal band so that the latter serves as a mandrel. The sheet-metal band may be bent on a primary mandrel and temporarily retained on the latter so that the sheet-metal strip is then bent about the band when the latter is still retained on the primary mandrel. End portions of the sheet-metal band and the sheet-metal strip may be connected with one another along the same generatrix of the cylindrical wall.
REFERENCES:
patent: 1812748 (1931-06-01), Kayser
patent: 1833747 (1931-11-01), Haughton
patent: 3131462 (1964-05-01), Owings et al.
patent: 3818585 (1974-06-01), Preece
patent: 3878802 (1975-04-01), Schmitt et al.
patent: 4074159 (1978-02-01), Robison
Schmitt Jakob
Voit Willy
Hall Carl E.
Robert & Bosch GmbH
Striker Michael J.
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