Double Shell Closure with Reverse Tapered Drop Lug
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Solution Overview
Problem
Existing dispensing closures lack a mechanism to prevent accidental removal while allowing for easy access and dispensing of contents, leading to potential leakage and misuse, especially in child-resistant designs.
Innovation Solution
A double shell dispensing closure with a reverse tapered drop lug mechanism that limits rotation and prevents removal of the cap from the container, combined with a child-resistant lock and multiple sealing mechanisms to ensure secure closure and easy dispensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple cap design is used, then ease of operation is improved, but reliability deteriorates due to accidental removal and leakage
Solution Approach 1:
The closure is divided into multiple functional components: an outer shell with child-resistant locks, an inner shell with drop lugs, and a stop mechanism. This segmentation allows each component to perform its specific function - the outer shell provides child-resistant protection, the inner shell enables controlled opening, and the stop mechanism prevents over-rotation and accidental removal.
Solution Approach 2:
The drop lug acts as an intermediary element between the inner shell and the stop mechanism. It translates rotational movement into linear engagement with the stop, creating a controlled opening mechanism that requires deliberate action while preventing accidental removal.
2Reliability
If a child-resistant lock mechanism is added, then reliability is improved, but device complexity increases
Solution Approach 1:
The child-resistant locks are merged with the outer shell structure, and the drop lugs are integrated into the inner shell. The stop mechanism is combined with the threading structure. This merging reduces the number of separate components while maintaining the child-resistant function, as the locks and stops work together as an integrated system.
Solution Approach 2:
Instead of using complex locking mechanisms that require multiple steps to open, the design inverts the approach by using a simple threaded structure where the stopping action occurs at a predetermined rotation point. The child-resistant function is achieved through the combination of the outer shell, inner shell, and stop mechanism rather than complex locks.
3Reliability
If a stopping mechanism is implemented, then reliability is improved, but ease of operation worsens due to limited rotation
Solution Approach 1:
The closure mechanism provides dynamic control over rotation: free rotation is allowed within a controlled range for dispensing, but rotation is automatically stopped at a predetermined point to prevent over-rotation and accidental removal. The system adapts its rotational freedom based on the operational state - open for dispensing, closed for storage.
Data Source
AI summary
The dispensing closure is provided having a stopping mechanism that limits the rotation of the closure and generally prevents removal of the closure from the container. The dispensing closure includes a cap body, fitment, and container finish. The cap body has a double shell design, which includes at least one drop lug reverse tapered from the inner shell. When the cap body is rotated about the container finish, the reverse tapered drop lug engages at least one lug stop located on the container finish so as to limit the rotation, thereby preventing removal of the cap body from the container finish. The reverse taper of the drop lug maximizes the abutment surface and stability of the drop lug when engaging the corresponding lug stop.