| 摘要 |
<p>Invention concerns wood-working and can be used in the production of the wooden floor boards. Wooden floor board has groove in the one side, tongue in the other side, groove 4 in the one end and groove 5 in the other end. There is compensating grooves 6 in the lower side of the board. There is special removable tongue 7 (in the figure it is placed in the groove 5 of the end of the board). Horizontal sides of the tongue are parallel and its end is rounded. There is cut above the side tongue, height and depth of the mentioned cut is 25-50% of the thickness of the side tongue.</p> |
