| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylindrical shaft, which is a product produced by bending of a metal plate, has high circularity, and is nearly free from longitudinal and literal warpages and excellent in linearity. SOLUTION: The cylindrical shaft 20 formed by a bent metal plate 10 is provided with protrusions 16 each protruded from one end 12 of a pair of joined ends 12, 14 of the metal plate 10 and having a part with a width which becomes larger as separated from the end 12 and with recesses 18 each being formed at the other end 14 of the pair of the ends, having a shape complimentary with the protrusion 16, and being fitted to the protrusion 16. COPYRIGHT: (C)2009,JPO&INPIT
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