| 摘要 |
With the aim of forming a waterproof structure without using a sealing material or filling material, the circumferential edge of the base main body part 4a is fitted in a first ring-form groove 5d in the pad main body part 5a. Next, the cover main body part 6a is fitted in a second ring-form groove 5e in the pad main body part 5a. Fastening screws are passed through from beneath the base main body part 4a, and are screwed into bosses 6d and 6e formed inside the cover main body part 6a. As a result, the second ring part 5c is fastened in place by being clamped between the lower end of the cover main body part 6a and the upper surface of the base main body part 4a. Accordingly, the base main body part 4a and cover main body part 5a can be fastened together in a water-tight manner.
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