| 摘要 |
PROBLEM TO BE SOLVED: To prevent chip powder of a predetermined size or larger from being intruded into a gap between a recess and a projection on a plate. SOLUTION: One end of each plate P in the connecting direction is formed in a recess Pa in cross section. The other end of each plate in the connecting direction is formed in a projection P in cross section. Any one plate P and a plate P before that plate are so disposed that one projection Pb of the plate P1 before any one plate P can be rotated in the other recess Pa of the any one plate P. Projections Mb and grooves in which the projections Mb are fitted which correspond to the recess Pa and projection Pb are formed at predetermined intervals. COPYRIGHT: (C)2008,JPO&INPIT
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