| 摘要 |
PURPOSE: A bookshelf supporting board is provided to make books upright even though a few books are inserted in the bookshelf. CONSTITUTION: A bookshelf supporting board includes: a screwnut(30) of porous wooden material, in which lower part of cylindrical shape is obstructed; a bolt(20) of wooden material having a cylindrical shape; and an adsorption plate which is attached to the lower part where the screwnut is obstructed and in which the side part of the adsorption plate has a spiral bumpy surface to make the bonding of bolt and screwnut possible.
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