| 摘要 |
PROBLEM TO BE SOLVED: To easily perform a work for exchanging a chair, etc., by easily attaching/detaching a pole for supporting a seat part to/from a floor without impairing strength and durability, etc., of the chair to be mainly arranged in a game hall. SOLUTION: A hilly cylindrical reception body 5 with an inner diameter enlarged and tapered upward therein is fixed to a board 3 to be fixed onto the floor. An engagement shaft 8 is orthogonally put through a part close to the lower end part 6 of the cylindrical pole 2 for supporting the seat part 1, and projected a little from both the side surfaces of the pole. The lower end part of the pole is fitted to the cylindrical reception body. When the pole is vertically established, the projecting parts 8a of the engagement shaft are positioned with a small gap g from an opening edge at the upper end of the cylindrical reception body. COPYRIGHT: (C)2005,JPO&NCIPI
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