| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a building material that makes a gap between the building materials inconspicuous even if the building materials are shrunk. <P>SOLUTION: A building material comprises a rectangular plate 2, a male tongue part 3, and a female tongue part 4. A first inclined plane 5 inclined inward toward a front side surface of the rectangular plate 2 from above the male tongue part 3 is provided between the male tongue part 3 and the front side surface of the rectangular plate 2. A second inclined plane 6 almost parallel to the first inclined plane 5 and a third inclined plane 7 inclined inward toward the front side surface of the rectangular plate 2 from above the second inclined plane 6 are provided between the female tongue part 4 and the front side surface of the rectangular plate 2. When the male tongue part 3 provided on one rectangular plate 2 and a female tongue part 4a provided in the other rectangular plate 2a are joined to each other, a V-groove 8 is formed between the first inclined plane 5 of the one rectangular plate 2 and a third inclined plane 7a of the other rectangular plate 2a. <P>COPYRIGHT: (C)2012,JPO&INPIT |
