| 摘要 |
PROBLEM TO BE SOLVED: To provide an innovative bolt structure of a folded-plate roofing mounting frame which is of simple constitution and excellent in mass- productivity and which allows a smooth nut attaching operation, for a bolt- equipped folded-plate roofing mounting frame being excellent in productivity and having a bolt with a structure such that it can be snap-fitted. SOLUTION: The bolt structure of a frame for mounting folded-plate roofing is capable of anchoring a hanger 4 or folded-plate roofing 5 in position, the hanger 4 being projected from the top of a folded-plate roofing mounting frame 2 attached to the top of a roof, for fixing the folded-plate roofing 5 to the folded-plate roofing mounting frame 2 by threadably attaching nuts 3 from above. An unthreaded part 8 which can be passed through the threaded attachment hole 7 of each nut 3 at the upper end of a bolt 6 without rotation of the nut 3 is provided and the upper end of the unthreaded part 8 is formed into a generally flat surface. The boundary part between the unthreaded part 8 of the bolt 6 and a threaded part 9 therebelow is provided with a tapered thread part 10 where a ridge increases in diameter toward a lower end to continue with the ridge of the threaded part 9.
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