| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pipe frame of a chair, which allows a bent portion to be sharply curved while satisfying both securement of the thickness of the bent portion and reduction in weight of a pipe, and further which can reduce restrictions on a structure adoptable as a chair folding mechanism. <P>SOLUTION: The pipe frame 4 of a chair having a bent portion 2 formed by bending a pipe 1 includes a thickness increased portion 3 for compensating reduction in thickness in the bending, which is integrally formed at least on an outside portion 2a of the bending of the bent portion 2. <P>COPYRIGHT: (C)2013,JPO&INPIT |
