| 摘要 |
PROBLEM TO BE SOLVED: To improve workability by restraining the warping of a butt end surface by drying-contraction of a floorboard. SOLUTION: This floorboard has a pair of butt end surfaces 2a and 2b and a pair of butt end surfaces 3a and 3b, and has a tongue 7 on one butt end surface 2a, and has a groove 8 on the other butt end surface 2b. A nail hiding groove 11 forming a driving groove of an oblique nail 14 is formed on one butt end surface 3a by setting a width and the depth smaller than the groove 8, and a projection strip part 12 fittable in the nail hiding groove 11 is formed on the other butt end surface 3b. COPYRIGHT: (C)2007,JPO&INPIT
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