Stackable Electrical Box Asymmetric Nesting
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Solution Overview
Problem
Conventional electrical boxes are voluminous and difficult to store, transport, and ship due to their one-piece structure, which hinders efficient nesting and stacking.
Innovation Solution
Designing electrical boxes with reversible nesting features such as ribs, grooves, notches, chamfers, and shoulders that allow specific orientations for stacking while preventing identical boxes from nesting, enabling patterns like X-Y-X-Y or X-Y-Z-X-Y-Z configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional one-piece electrical box structures are used with external mounting features, then installation capabilities are maintained, but storage and transportation space requirements increase
Solution Approach 1:
The patent implements nesting features including ribs on the outer surface and corresponding grooves on the inner surface of electrical boxes. These features enable one electrical box to be nested within another, significantly reducing storage and transportation space requirements. The ribs and grooves create complementary interfaces that allow tight nesting while maintaining box integrity.
Solution Approach 2:
The patent employs asymmetric nesting features where the rib pattern on the outer surface is mirrored or offset from the groove pattern on the inner surface. This asymmetry ensures that boxes can only nest in specific orientations, preventing improper stacking while maximizing space efficiency. The asymmetric design also distinguishes between different box types within a product family.
2Ease of operation
If multiple electrical boxes are stored separately, then installation features are preserved, but storage efficiency and portability decrease
Solution Approach 1:
Multiple electrical boxes are designed to nest within each other through complementary rib and groove features. This allows a stack of boxes to be collapsed into a compact form factor, improving portability and reducing the quantity of space required to store multiple boxes. The nesting capability maintains easy access to individual boxes when needed.
3Volume of stationary object
If nesting features are added to electrical boxes, then storage space is reduced, but manufacturing complexity increases
Solution Approach 1:
The nesting features are segmented into distinct components: ribs on the outer surface and grooves on the inner surface. This segmentation allows the features to be manufactured as integral parts of the box structure using standard molding techniques, minimizing manufacturing complexity. The rib and groove features can be created in the same molding cycle as the box itself, avoiding additional manufacturing steps.
4Productivity
If identical electrical boxes are designed to nest, then storage efficiency improves, but nesting control and orientation management become difficult
Solution Approach 1:
The patent implements asymmetric rib and groove patterns that create orientation-dependent nesting. The rib pattern on one box fits into the groove pattern of another box only in specific orientations. This asymmetric design provides automatic orientation control, ensuring boxes are nested correctly without requiring manual alignment or complex control mechanisms. The asymmetric features make it physically impossible to nest boxes in incorrect orientations.
Data Source
AI summary
A method and structure of a system of electrical boxes including differing patterns of interference structures, such as ribs and/or grooves, to prevent identical boxes from being nested but permit non-identical boxes from being nested for more space-efficient storage of electrical boxes.