Squeeze Turn Closure Stabilizing Ridges Alignment
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Solution Overview
Problem
Prior art squeeze and turn closures face issues with the outer component jostling around the inner component, making it difficult to align them for opening, which prevents the locking lugs from engaging and thus hinders the opening of the container.
Innovation Solution
A child-resistant closure assembly featuring a locking cap with stabilizing ridges and ramped tabs that coaxially align and securely engage with the inner cap, allowing for easy adult access while maintaining child safety by requiring a squeeze and turn mechanism for opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-component squeeze and turn closure is used, then child safety is improved, but the outer component jostles around the inner component making alignment difficult
Solution Approach 1:
The patent introduces locking lugs as intermediary elements that mediate between the outer closure component and the inner closure component. These locking lugs engage with corresponding features on the inner component to prevent the outer component from jostling around, thereby maintaining proper alignment while preserving the two-component child safety mechanism.
Solution Approach 2:
The patent incorporates alignment features such as ribs and grooves that preliminarily establish the correct relative position between the outer and inner closure components. This preliminary alignment action ensures that when the user attempts to open the closure, the components are already properly positioned for the locking lugs to engage, eliminating the alignment difficulty.
2Ease of operation
If locking lugs are added to prevent jostling, then alignment is improved, but device complexity increases
Solution Approach 1:
The patent merges the alignment function and the locking function into a single integrated feature. The locking lugs serve dual purposes: they prevent the outer component from jostling around (alignment function) and they mechanically lock the two components together (locking function). This merging reduces device complexity by eliminating the need for separate alignment mechanisms.
Solution Approach 2:
The locking lugs are designed as multi-functional elements that simultaneously perform alignment, stabilization, and locking functions. This universality reduces the overall number of components needed in the closure system, thereby reducing device complexity while maintaining ease of operation.
3Ease of operation
If the outer component is free to rotate, then ease of opening is improved, but proper engagement cannot be achieved
Solution Approach 1:
The patent creates a dynamic system where the outer closure component is allowed to rotate freely until the user applies the correct squeezing force. At that moment, the locking lugs engage with the inner component, transforming the system from a free-rotation state to a locked state. This dynamic behavior allows ease of opening through rotation while ensuring reliable engagement when the proper action is taken.
Solution Approach 2:
The locking lugs are positioned and dimensioned to prevent premature engagement or misalignment during rotation. The geometry of the locking lugs and their corresponding features on the inner component creates a preliminary anti-action that guides the rotation and ensures that engagement can only occur when the components are properly aligned, preventing failed opening attempts.
Data Source
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Figure 3
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AI summary
A cap-locking assembly (20) includes an inner cap (22) having a ribbed outer surface and a locking cap (24). The locking cap includes opposing first and second engagement mechanisms(102, 104), opposing first and second stabilizing ridges (106, 108), and a plurality of ramped tabs (96), all of which are disposed on the interior surface of the locking cap. When the ramped tabs engage a lower edge of the inner cap they retain the inner cap inside the locking cap. Further, the opposing first and second stabilizing ridges coaxially align the inner cap and the locking cap. Finally, the opposing first and second engagement mechanisms engage with the ribbed outer surface (48) of the inner cap upon application of an inward force to the locking cap.