| 摘要 |
PURPOSE: A bookshelf supporting board is provided, which can stand books perpendicularly even though a small number of books are inserted into a bookshelf. CONSTITUTION: A bookshelf supporting board comprises: a screwnut(30) made of the bored lumber in which the lower part of the cylindrical shape is obstructed; a bolt(20) which is made of the lumber and has the cylindrical shape; and an adsorption plate(10) in which the side has spiral unevenness in order to make coupling of the bolt and screwnut possible and which is attached to the obstructed lower part of the screwnut.
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