| 摘要 |
PURPOSE:To prevent deformation and occurrence of distorsion in synthetic resin parts upon thermal shrinkage, by providing a stopper face colliding with the edge of bolt in a nut for fixing bolt thereby maintaining the gap between the fixing face of said parts and the inner end face of nut. CONSTITUTION:A stopper face 11a is formed in a nut 11 from a tapered face while facing with the end face of fixing bolt 6 where the stopper face 11a will collide against the bevelled edge 6b of said bolt 6. Consequently, the axial position or the position in the fastening direction of nut 11 is limited to maintain the gap (D) between the fixing face 5d of foot section 5 and the inner end face 11b of nut 11 approximately constant. The air straightner board (S) made of synthetic resin csn move laterally against the upper face panel 1 upon thermal shrinkage, to prevent deformation and occurrence of distortion. |
