Double-Wall Box Cover Assembly That Prevents Latch Misalignment
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Solution Overview
Problem
Existing box-shaped bodies, such as electric junction boxes, face issues with improper assembly due to engaging portions erroneously entering gaps between the inner and outer walls, affecting operability and potentially causing molding defects.
Innovation Solution
A multilayer wall structure with connecting walls sandwiching the outer wall between the inner and engaged portions, guiding the engaging portions to avoid gaps and ensuring proper assembly without visual checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cover is assembled to the case with a double wall structure, then waterproofness is improved, but the engaging portion may erroneously enter the gap between layers reducing assembly operability
Solution Approach 1:
A guide wall is introduced as an intermediary component between the engaging portion and the gap between inner and outer walls. The guide wall acts as a mediator that directs the engaging portion along its outer surface, preventing erroneous entry into the gap while maintaining the double wall structure for waterproofness.
Solution Approach 2:
The guide wall is pre-formed as part of the case structure before assembly with the cover. Its presence beforehand ensures that the engaging portion is guided correctly from the start of the assembly process, preventing misalignment and erroneous entry into the gap between wall layers.
2Manufacturing precision
If the engaging portion is designed to fit tightly, then assembly precision is improved, but the risk of erroneous entry into gaps increases
Solution Approach 1:
The guide wall serves as a protective intermediary that intercepts the engaging portion before it can erroneously enter the gap. This allows the engaging portion to maintain tight fit characteristics for precision assembly while the guide wall prevents harmful erroneous entry into the inter-layer space.
Data Source
AI summary
A box-shaped body includes: a case having a tubular peripheral wall; and a cover. The cover includes an engaging portion extending in an attachment direction in which the cover is attached to the case. The peripheral wall has a multilayer wall structure including an inner wall and an outer wall, and includes a connecting wall and an engaged portion, and the engaged portion being configured to be engaged with the engaging portion. An end surface of the connecting wall facing the cover is located at a position, closer to the cover in the attachment direction than an end surface of at least one of the inner wall and the outer wall facing the cover, or the same position, in the attachment direction as the end surface of at least one of the inner wall and the outer wall facing the cover.