| 摘要 |
PROBLEM TO BE SOLVED: To provide the drain structure of an electrical junction box which can protect a drain hole from clogging and enables stable drainage even if it is splashed by mud add, further, can prevent external moisture from penetrating into the box. SOLUTION: A clamp 4 which has a plate 5, a pillar 6 stood at the center of the plate 5, two wings 7 which extend from the tip of the pillar 6 to the neighborhood of the plate 5 and can be elastically deformed is attached to a drain hole 3 formed in the bottom wall 2 of an electrical junction box 1 by inserting both the wings 7 into the junction box 1 through the drain hole 3. Guide planes 8 which are slidably fitted to the inner circumferential surface of the drain hole 3 and steps 9 which are brought into contact with the inner edge of the drain hole 3 when the clamp 4 is made to descend by its own weight are formed on the respective tips of both the wings 7. A gap 10 is formed between the outer surface of the bottom wall 2 and the plate 5 when the clamp 4 is at the descending position. If an external force is applied to the plate 5 upward in this state, the plate 5 is brought into tight contact with the outer surface of the bottom wall 2 while the guide planes 8 of the respective wings 7 are fitted to the inner circumferential surface of the drain hole 3. As a recessed part does not exist under the drain hole 3, even if the plate 5 is splashed by mud, the drain hole 3 is not clogged.
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