Child Resistant Cap With Interlocking Teeth And Frangible Seal
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Solution Overview
Problem
Current child-resistant caps may not effectively prevent accidental access by small children, as the extra action required for opening is not always apparent and may not provide sufficient security against hazardous substances.
Innovation Solution
A tamper-resistant cap design featuring an inner and outer cap with complementary teeth mechanisms and a frangible seal, where the outer cap must be pressed and turned to mesh with the inner cap, allowing unthreading, and includes a central bore to engage and break a frangible post on the container neck for secure closure and opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a typical child resistant cap requires extra action beyond normal opening motion, then child safety is improved, but the opening action is not apparent and usability deteriorates
Solution Approach 1:
The cap employs color-coded indicators and visual markings that change or become apparent during the opening process. The frangible seal breaks to reveal visual cues, and the dual-cap design uses contrasting colors to show the required twisting motion direction, making the extra action obvious without compromising child safety
Solution Approach 2:
The patent introduces an intermediary visual indication system between the child-resistant mechanism and the user. Printed instructions, color codes, and visual markers serve as mediators that communicate the required opening action clearly to users while maintaining the security function
2Reliability
If a frangible seal is engaged with the cap, then tamper resistance is improved, but the cap structure complexity increases
Solution Approach 1:
The cap is divided into distinct functional segments: an outer cap, an inner cap, and a frangible seal component. This segmentation allows each part to perform its specific function independently while simplifying the overall design - the frangible seal is a separate breakable element that provides tamper resistance without requiring complex integrated mechanisms
Solution Approach 2:
The inner cap is nested within the outer cap, with the frangible seal positioned between them. This nested arrangement provides a compact structure where the frangible seal engages with both caps to create tamper resistance, achieving security functionality without excessive structural complexity
3Reliability
If upwardly and downwardly extending teeth are used for engagement, then security against accidental opening is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The teeth are designed with asymmetric profiles where the upwardly extending teeth on one cap have complementary asymmetric shapes on the downwardly extending teeth of the other cap. This asymmetric design creates a unique meshing pattern that provides security against accidental opening while being manufacturable with standard precision tolerances, as the asymmetric shapes guide proper alignment during assembly
Data Source
AI summary
A tamper resistant cap for a container includes an inner cap and an outer cap. The inner cap has a threaded inner surface, and an upper surface with a plurality of upwardly extending teeth. The outer cap houses the inner cap and defines a central bore thereabove with an inner engagement surface. On an intermediate layer of the outer cap, below the upper bore, there are a plurality of downwardly extending teeth. The tamper resistant cap is releasably securable onto a neck of the container by engagement with the threaded inner surface and removable therefrom by applying a downward force to the outer cap to mesh the upwardly and downwardly extending teeth. The central bore is engageable with a frangible post of the container to effect removal thereof.