| 摘要 |
A composite structure comprises: a cover plate (14) that comprises a countersink (101) with a tapered hole shape and a plate-side fitting hole (102) on the small diameter side of the countersink; a bearing plate (13) that comprises a screw hole (104) with female threading and a screw side fitting hole (105) on the opposite side to the plate-side fitting hole with the screw hole therebetween; and a plate screw member (18) that comprises a tapered bearing surface portion (181) that sits in the countersink (101), a screw portion (184) with male threading to screw into the screw hole, and a plate-side fitting portion (182) and a screw-side fitting portion (185) that can fit in and align with the plate-side fitting hole and the screw-side fitting hole. The difference in diameter δ⌀a of the plate side fitting hole and the plate side fitting portion, the difference in diameter δ⌀b of the screw-side fitting hole and the screw-side fitting portion, and the difference in the effective diameter δ⌀c of the screw hole and the screw portion satisfy the dimensional relationships of δ⌀a<δ⌀c and δ⌀b<δ⌀c. |
