Vial Closure Assembly Anti-Rotation Locking Mechanism
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Solution Overview
Problem
Existing vial closure assemblies face challenges in maintaining a leak-tight seal due to manufacturing tolerances and dimensional variations, leading to potential breaches when the cover and stopper rotate relative to the vial, which complicates secure and stable closure.
Innovation Solution
A vial closure assembly comprising a ring, cover, and shell with locking tabs and a sliding rail system that prevents rotation of the stopper relative to the vial, utilizing an elastomeric stopper and a polymer outer shell to minimize friction and torque transfer, ensuring secure sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking cover is used to seal the stopper, then the isolation of vial contents is improved, but manufacturing tolerances and dimensional variations cause incorrect locking and potential rotation
Solution Approach 1:
The friction reduction element changes the friction parameter between the locking cover and presser plate, transforming it from a high-friction interface to a low-friction interface. This allows the locking cover to move freely during pressing without accumulating friction that would cause misalignment or rotation, while still achieving secure locking through the tab-and-slot mechanism
Solution Approach 2:
The friction reduction element acts as an intermediary between the locking cover and presser plate, mediating the interaction by reducing frictional forces. This intermediary component allows the locking cover to slide smoothly during the locking process while maintaining secure engagement through the tab-and-slot mechanism
2Ease of operation
If friction is reduced between the locking cover and presser plate, then correct locking is improved, but rotational movement of the cover and stopper may increase
Solution Approach 1:
The locking mechanism is segmented into distinct functional zones: the friction reduction element handles axial movement during pressing, while the tab-and-slot mechanism handles rotational prevention. This segmentation allows each component to specialize in one function, achieving both smooth operation and rotational stability
Solution Approach 2:
The tab-and-slot mechanism uses asymmetric geometry where the tab fits into a slot with specific orientation. This asymmetric design allows free axial movement during pressing while preventing rotational movement, as rotation would require the tab to pass through the slot in an impossible geometric configuration
3Reliability
If the cover is securely locked to prevent rotation, then seal integrity is improved, but friction creates resistance to movement during locking
Solution Approach 1:
The friction reduction element is positioned to engage before the locking cover reaches its final locked position. This preliminary action reduces friction during the movement phase, allowing smooth operation, while the tab-and-slot mechanism engages at the appropriate moment to prevent rotation and ensure seal integrity
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 effectively reduces the likelihood of seal breaches by stabilizing the stopper position and preventing rotation, thereby maintaining a secure and leak-tight seal, even with variations in manufacturing tolerances and container dimensions.
Implementation Method 1
The upper lip includes at least one rail for sliding contact with a top surface of the second top wall
Data Source
AI summary
A vial closure assembly for sealing a container includes a ring, a cap, a shell, and an optional cover. The ring has a first top wall defining a first through-opening and a skirt extending downwardly from the first top wall that includes a plurality of locking tabs. The cover includes a second top wall defining a second through-opening, a sidewall extending downwardly from the second top wall, and an interior cavity defined by the second top wall and the sidewall. The cap includes a plurality of tabs configured to engage the first or second top wall. The shell includes a body having an inwardly radially extending upper and lower lip. The upper lip includes at least one rail for sliding contact with a top surface of either the first or second top wall.