Child-Resistant Container Cap With Keyed Slots for Adult Opening
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Solution Overview
Problem
Existing child-resistant caps are either too difficult for adults to open or too easy for children to access, lacking a balance between ease of use and security.
Innovation Solution
A cap design featuring engagement features that align with corresponding slots on the container, allowing for easy adult access when aligned correctly but preventing removal by children due to misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cap uses a child-resistant mechanism with engagement features and slots, then security against child access is improved, but ease of operation for adults deteriorates
Solution Approach 1:
The cap employs asymmetric engagement features with specific geometric configurations (triangular, rectangular, circular cross-sections) that create a keyed interface between the cap and finish. This asymmetric design ensures that only caps with matching asymmetric features can properly engage and rotate, providing security while maintaining ease of operation for authorized users who have the correct cap geometry.
Solution Approach 2:
The child-resistant mechanism transitions from a static locked state to a dynamic unlocked state through rotational movement. The engagement features are designed to slide along the finish surface during rotation, allowing the cap to be easily opened by adults who understand the rotational motion, while children cannot figure out the dynamic sequence required to unlock it.
2Reliability
If the cap mechanism is made more secure with multiple engagement features, then child resistance is improved, but device complexity increases
Solution Approach 1:
The child-resistant mechanism is segmented into multiple discrete engagement features (first, second, third, and fourth engagement features) with different cross-sectional geometries positioned at different locations on the cap's interior surface. Each engagement feature independently engages with corresponding features on the finish, providing enhanced security through distributed engagement points while keeping each individual feature simple in design.
Solution Approach 2:
Different engagement features have locally optimized geometries (triangular, rectangular, circular cross-sections) suited to their specific positions and functional requirements. This local quality variation allows each engagement feature to provide optimal resistance against child access while maintaining manufacturing simplicity through standard geometric shapes.
3Reliability
If the engagement features are made more robust to prevent breaking, then reliability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The engagement features are designed with varied cross-sectional parameters (triangular, rectangular, circular) that optimize their mechanical strength and resistance to breaking. These parameter variations allow each feature to be robust against specific types of failure modes while remaining manufacturable through standard molding or machining processes for common geometric shapes.
Data Source
AI summary
A child-resistant container that includes a cap and a bottle portion. The cap includes several inner engagement features protruding radially inwardly and the finish of the bottle portion includes a protrusion disposed about the opening with an overhanging ledge. Slots in the ledge correspond to the engagement features. In one particular embodiment, the cap includes two different length circumferential engagement features and two triangular engagement features.