Safety Capsule Cover Retention via Segmented Extraction Prevention
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Solution Overview
Problem
Existing child-proof safety capsules are prone to de-capping when children exert force on the lower circumferential edge of the cover, leading to potential accidental access to the container's contents.
Innovation Solution
A safety capsule design featuring a press-fit engagement mechanism and extraction prevention means, including a folded strip and a stopping abutment, which opposes separation of the cover from the cap, providing increased resistance to de-capping forces and ensuring secure closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an annular projection and annular abutment are used to prevent cover removal, then the cover can be retained securely under normal conditions, but the edge may be deformed by localized force causing de-capping
Solution Approach 1:
The extraction prevention means is divided into multiple discrete elements (projections and corresponding abutments) distributed around the circumferential edge. This segmentation allows the force to be distributed across multiple contact points rather than concentrated at a single point, preventing localized deformation while maintaining secure retention.
Solution Approach 2:
The cap and cover are provided with specific local structural features (projections and abutments) at critical locations where extraction prevention is needed. These localized features create high resistance to extraction forces at the interface between cap and cover, while the overall structure remains simple.
2Ease of operation
If the cover is designed to allow easy opening by coordinated movement, then adult users can open it easily, but children may accidentally deform the edge to bypass the retention mechanism
Solution Approach 1:
The extraction prevention means (projections and abutments) is built into the structure before use, creating preliminary resistance against extraction forces. This pre-built defensive structure prevents children from accidentally deforming the edge and bypassing the retention mechanism, while not interfering with the intended opening operation by adults.
Data Source
AI summary
A safety capsule for a container, comprising:a threaded closure cap (2) for closing the container;a cover (3) for said cap (2), said cover (3) comprising a base (30) and a lateral wall (31) that extends from said base (30); said base (30) and said lateral wall (31) overlying said cap (2);a press-fit engagement means (5) that enables transmission of motion from the cover (3) to the cap (2) for unscrewing said cap (2);means (6) preventing extraction of the cover (3) from the cap (2), said means (6) comprising:a) a strip (60), being part of the cover (3), bent towards the inside of the cover (3);b) a stopping abutment (61), being part of the cap (2), intended to abut said strip (60) at least whenever there is an attempt to pull out the cap (2) from the cover (3).