WATERTIGHT PACKING STRUCTURE OF ELECTRICAL JUNCTION BOX

摘要

A watertight packing structure of an electrical junction box includes: a box main body; a cover; inclined step portions each formed on the box main body and the cover; a packing-receiving groove provided on any one of the step portions; and a wall-end portion provided on the other step portion for pushing a packing in the packing-receiving groove. At a start end or a stop end of the step portion, a gap between the most concaved portion in a concave curved portion of any one of the packing-receiving groove and the wall-end portion facing each other and the most projecting portion in a convex curved portion of the other is set narrower than any other gap between any other portions of both curved portions. A radius R1 of the concave curved portion is set larger than a radius R2 of the convex curved portion.