Child-Resistant Flip-Top Closure With Sequential Ratchet Locking
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Solution Overview
Problem
Child-resistant closures often become too complex for adults with arthritic conditions to open, while existing designs may not adequately prevent young children from accessing container contents.
Innovation Solution
The development of child-resistant flip-top closures with a ratchet locking feature and a unique child-resistant construction that requires two separate manual manipulations to open, utilizing a living hinge or snap-together design, making it easier for adults with dexterity limitations to access the contents while preventing young children from opening the container.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If child-resistant closure requires two concurrent manipulations (squeeze-together and twist), then young children cannot open it, but adults with arthritic conditions find it difficult to open
Solution Approach 1:
The closure operation is segmented into two distinct sequential steps: first pressing the pressing element to release the locking mechanism, then rotating the closure body to open it. This segmentation allows children to perform only one simple action (pressing) without being able to complete the opening, while adults can easily perform both sequential actions despite dexterity limitations.
2Reliability
If child-resistant features are integrated into closure, then young children cannot access contents, but closure construction becomes complicated
Solution Approach 1:
The child-resistant locking mechanism is merged with the closure body as an integrated assembly. The locking element, pressing element, and ratchet mechanism are combined into a unified structure where the locking feature is formed by the interaction between the closure body and child-resistant cap, eliminating the need for separate complex child-resistant components.
Solution Approach 2:
The closure mechanism uses the user's own pressing action on the pressing element to automatically trigger the release of the locking mechanism. The ratchet mechanism automatically engages and disengages based on the rotation direction, providing self-regulating child-resistant protection without requiring additional control systems or complex mechanisms.
Data Source
AI summary
A child-resistant, flip-top closure includes a closure body for secure connection to a container which stores the content/product which is to be dispensed. Hinged to the closure body is a flip-open lid which is constructed and arranged to be lifted manually. A child-resistant structure is incorporated into the closure construction. The child-resistant structure of one exemplary embodiment is constructed and arranged with a squeeze-to-release feature. The child-resistant structures of other exemplary embodiments are constructed and arranged with a tab press-down feature. Actuation of the child-resistant structure (squeeze or press down) must be performed concurrently with the lifting action applied to the flip-open lid.