Hinged Container Protective Flap Design
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Solution Overview
Problem
Plastic egg cartons with flanged hinges pose a safety hazard due to sharply angled trim edges, but manufacturing rounded corners reduces structural rigidity and aesthetic appeal.
Innovation Solution
A hinged container design featuring a folded hinge connection with protective flaps that extend from the lid to deflect objects away from sharp edges, maintaining structural and aesthetic benefits while preventing injuries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the hinge trim edges are left sharp for ease of manufacture and structural rigidity, then manufacturing complexity is reduced and structural strength is maintained, but user safety deteriorates due to injury risk from sharp edges
Solution Approach 1:
The hinge trim is segmented into two functional zones: a sharp inner trim edge for structural integrity and manufacturing simplicity, and a separate rounded outer protective flap for user safety. This segmentation allows each edge to serve its specific purpose without compromising the other.
Solution Approach 2:
A rounded protective flap is introduced as an intermediary element between the user's finger and the sharp hinge trim edge. This mediator deflects contact away from the sharp edge, preventing injury while allowing the sharp edge to remain for structural and manufacturing reasons.
2Object-affected harmful factors
If the hinge trim corners are rounded for user safety, then user safety is improved, but structural rigidity deteriorates and manufacturing complexity increases
Solution Approach 1:
The hinge structure is segmented into the main rigid body with sharp trim edges for structural integrity, and a separate protective flap with rounded edges for safety. This segmentation preserves structural rigidity while providing safety benefits.
Solution Approach 2:
The protective flap extends in a new dimension beyond the plane of the sharp trim edge, creating a three-dimensional protective barrier. This dimensional addition provides safety without altering the two-dimensional structural integrity of the original hinge design.
3Strength
If the hinge trim edges are kept sharp for structural integrity, then structural strength is maintained, but user safety deteriorates due to exposed sharp edges
Solution Approach 1:
The rounded protective flap serves as an intermediary barrier between the user and the sharp structural trim edge. It intercepts and deflects contact away from the sharp edge, maintaining both structural integrity and user safety simultaneously.
Solution Approach 2:
The potentially harmful sharp trim edge is converted into a beneficial structural feature by adding the protective flap. The sharp edge continues to provide structural integrity while the flap converts the hazard into a safety feature by deflecting contact away from it.
Data Source
AI summary
To guard against injury to persons engaging the trim edges of a hinged container, a protective flap extends from the lid on either end of the axial hinge. The flaps extend from the corners of the lid adjacent respective trim edges of the hinge. The flaps have a rounded bottom portion which is extended past the axial hinge line. The curved structure of the protective flaps helps to gently deflect objects, such as fingers, away from any sharply angled trim edges of the hinge, thereby guarding handlers from accidental injury.