| 摘要 |
PROBLEM TO BE SOLVED: To constitute a boot economically by performing a miniaturization and a weight saving easily while maintaining desired durability. SOLUTION: The boot 10 is equipped with a large size cylindrical part 18, a small size cylindrical part 20 and a bellows part 22 to connects the above large size cylindrical part 18 and the above small size cylindrical part 20. The bellows part 22 prepares the first mountain part 24a to the sixth mountain part 24f and the first valley part 26a to the sixth valley part 26f continuously. While the opening angleθ1 toθ3 of the mountain part inner circumference face of the first mountain part 24a to the third mountain part 24c is set up smaller than the opening angleθ4 toθ6 of the mountain part inner circumference of the forth mountain part 24d to the sixth mountain part 24f, the wall thickness t7-t12 of the slant part 28g to 28l is set up thinner than the wall thickness t1-t6 of the slant part 28a to 28f. COPYRIGHT: (C)2008,JPO&INPIT
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