Cap and Stem Assembly with Pinch Tabs
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Solution Overview
Problem
Existing container designs with integrated applicators or brush tips are not detachable from the cap, leading to wrist strain, especially in child-resistant packaging that requires rotation to open, which can be challenging for users with impaired manual dexterity.
Innovation Solution
A cap and stem assembly where the stem is either permanently affixed or removably coupled, with a dual-pinch-and-pull mechanism that allows the cap to be unlocked and separated from the container, reducing wrist strain and enabling sanitary storage or engagement with material inside the container.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If child-resistant packaging requires rotation to open, then security against unauthorized access is improved, but wrist strain for users with impaired manual dexterity worsens
Solution Approach 1:
The cap is segmented into functional zones: stationary side walls that remain fixed during operation, and opposing push-tabs that are designed to move. This segmentation allows the opening mechanism to be divided into distinct motion components, reducing the need for full rotational wrist movement while maintaining security.
Solution Approach 2:
The push-tabs are designed with elastic deflection capability, transitioning from a locked position to an unlocked position through controlled movement. This dynamic design allows the cap to open through a pushing and pulling motion rather than full rotation, reducing wrist strain while maintaining child-resistant security through the controlled release mechanism.
2Device complexity
If applicator is integrated permanently into cap, then device simplicity is improved, but sanitary storage and material engagement flexibility worsen
Solution Approach 1:
The applicator system is segmented into a stem component that can be detachably attached to the cap. This allows the applicator to be separated into the cap assembly for storage and the stem for material engagement, providing both sanitary storage capability and flexible material engagement while maintaining relatively simple device construction.
Solution Approach 2:
The stem is designed with removable coupling to the cap, allowing it to be attached when material engagement is needed and detached for sanitary storage. This dynamic configuration enables the system to transition between integrated and separated states, providing versatility without permanently increasing device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a resealable, access-resistant packaging that minimizes wrist strain and allows for easy access to the container's contents, suitable for various products, including cosmetics and controlled substances, while maintaining a sanitary environment.
Implementation Method 1
opposing push-tabs that deflect in response to applied pressure from a first state (e.g., locked position) to a second state (e.g., unlocked position)
Implementation Method 2
a seal formed between an inner diameter of the container and a sealing taper of the cap when fastened to the container in the first state
Data Source
AI summary
A resealable, access-resistant assembly, including a cap and a stem, is configured to fasten to a container by way of opposing tabs that, when pinched towards each other, deflect from a locked to unlocked position to then be separated (e.g., lifted off of or unscrewed) from the container. The cap is permanently affixed or removably coupled to a stem that extends down from the cap into the container. When the cap is separated from the container, the stem may be positioned to extend into the container to engage material within it or for other miscellaneous uses.