| 摘要 |
PROBLEM TO BE SOLVED: To prevent gathering of rainwater by respectively arranging a plurality of shape memory linear material extending in the longitudinal and lateral directions in a main body sheet part for covering an upper surface part of a head guard, and restoring the main body sheet part from deformation by a temperature and humidity. SOLUTION: Shape memory glass fibers 13a as shape memory linear material are fully embedded in large numbers at prescribed intervals in the lateral direction by the sheet length in the longitudinal direction inside a main body sheet part 11. Shape memory glass fibers 13b are fully embedded in large numbers at prescribed intervals in the longitudinal direction by a sheet width in the lateral direction. Thus, even if rainwater gathers in a lattice part in a lattice- shaped upper surface part 2, the rainwater can be dropped from the main body sheet part 11 in rainy weather by a shape restoring function of the shape memory glass fibers 13a, 13b. Thus, the gathered rainwater does not drop even if a vehicle is operate after the rain, so that an operator can safely perform work without caring about the rainwater.
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