| 摘要 |
A protective cap having excellent gas permeability and ventilating property, provided with a waterproof feature in rainy weather or the like, and having a considerable strength. The protective cap comprises a cap body having an inner layer and an outer layer with a gap therebetween, a multiplicity of vent holes formed in the inner layer and outer layer to be staggered from one another on the inner and outer layer sides, dams provided around the vent hole on a side of the inner layer facing the outer layer, and spacers including vertical walls disposed centrally of the vent holes or adjacent to the vent holes and contacting with the inner layer and outer layer. Also, the protective cap comprises a cap body having an inner layer and an outer layer with a gap therebetween, concave and convex portions alternately provided on a side of the inner layer facing the outer layer to extend radially from apices, vent holes provided in the convex portions, and vent holes formed in the outer layer to face the concave portions of the inner layer.
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