Double-Wall Resin Cover Assembly Without Wall Interference
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Solution Overview
Problem
Existing resin structures for electrical junction boxes with double-wall structures face challenges in achieving both waterproofness and workability, as the peripheral walls of the main body case and upper cover often interfere with each other during attachment and detachment, making it difficult to perform these steps effectively.
Innovation Solution
A resin structure design featuring a first resin body with a double-wall structure and engagement portions, where the second resin body is rotated with respect to the first resin body, preventing interference between the peripheral walls by positioning the engaging parts in a way that allows parallel movement during attachment and detachment, thus enhancing workability while maintaining waterproofness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both the main body case and upper cover have a double-wall structure for waterproofness, then waterproofness is improved, but the peripheral walls interfere with each other during attachment and detachment, worsening workability
Solution Approach 1:
The peripheral wall engagement mechanism is segmented into multiple engagement portions distributed around the circumference. This allows the upper cover to be attached by engaging at one location while rotating, preventing the double-wall structures from interfering with each other during the attachment process, thus maintaining both waterproofness and workability
Solution Approach 2:
The attachment mechanism transitions from a static parallel alignment requirement to a dynamic rotational engagement process. The upper cover rotates during attachment, allowing the engagement portions to engage sequentially while the double-wall structures move apart, eliminating interference and improving workability while maintaining the waterproof double-wall structure
Data Source
AI summary
A resin structure includes first and second resin bodies including first and second wall portions and first and second engagement portions, respectively. One of the first engagement portions engages with one of the second engagement portions and form a first engaging part. Another one of the first engagement portions engages with another one of the second engagement portions and form a second engaging part. The first engaging part is positioned on a further front side than the second engaging part in an attaching direction of the second resin body to the first resin body. When the second resin body is rotated toward the first resin body with the first engaging part as a center of rotation and with the one of the first engagement portions being engaged with the one of the second engagement portions, the first wall portion is prevented from interfering with the second wall portion.