| 摘要 |
PROBLEM TO BE SOLVED: To provide a ventilation water non-impermeable device that is constructed by two rubber components of an outer case and an inner case and a ventilation water-impermeable sheet, can be easily mounted in a mounting through-hole of a housing and can obtain sufficient mounting force.SOLUTION: In a ventilation water-impermeable device in which a water-impermeable unit having rubber outer case and inner case, and a ventilation water-impermeable sheet sandwiched between the cases is mounted in a mounting through-hole of a housing, the outer case has an anti-loosening flange portion at one end portion of a cylindrical portion and a bottom plate portion having a hole at the other end portion of the cylindrical portion. The inner case comprises a cylindrical body having a hole which is fitted in the cylindrical portion of the outer case and pinches the ventilation water-impermeable sheet with the bottom plate portion having the hole. The mounting through-hole has an anti-loosening inner cylindrical face having a smaller diameter than the other portion at the intermediate portion in the axial direction of the mounting through-hole. The ventilation water-impermeable unit is inserted from the bottom plate portion having the hole into the mounting through-hole. The outer case has an insertion guide small-diameter portion non-compressed by the anti-loosening inner cylindrical face and an anti-loosening large-diameter portion compressed by the anti-loosening inner cylindrical face which are arranged in this order from the bottom plate portion having the hole to the insertion direction.SELECTED DRAWING: Figure 1 |
