| 摘要 |
PROBLEM TO BE SOLVED: To prevent load concentration on a welded part, and reduce the number of parts in a leg structure. SOLUTION: The leg structure is provided with a plurality of supports 8 combined and welded with each other, and a sheath pipe 90 covering the welded part of a bundle 16 of the supports 8 to prevent widening of the bundle of the supports 8 at the welded part. A spacer is provided at a center of the bundle of the supports 8, and each support 8 is welded with it. A gap is provided between the bundle of the supports 8 and the sheath pipe, and a seat of a chair is installed on the sheath pipe. COPYRIGHT: (C)2007,JPO&INPIT
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