| 摘要 |
PURPOSE:To contrive reduction of floor's load bearing by a method wherein working rods, displacable in the longitudinal direction, are provided at the four side-faces at the inside of a floor board member, and are simultaneously displaced from the outside of a box body of the floor board, and holes are provided for insertion of the working rods from the floor boards member and for projection of their tips from the side faces. CONSTITUTION:A floor board member 10a-10c is made in a box shape structure and placed with its four side-faces fitted closely to the adjoining board member. At the end of the four side-faces 121-124, holes 111-114 are provided and working rods 131-134 are inserted to the inside of the floor board member 10a-10c in the positions facing to the holes 111-114, and are placed on the different levels of the upper and lower positions so that the working rods are made to be displaceable in the longitudinal directions. The direction of displacement of the adjoining working rods 131-134 is made to be at the right angle. Racks 141-144 and 151-154 are provided at the end of the respective working rods 131-134. Gears with pinion members 16a and 16b placed in a two-stage of upper and lower installations are supported by the floor board members 10a-10c. With the arrangements as mentioned above, a plurality of floor board members can be firmly fixed each other. |
