Closure Cap Pre-positioning via Snap-fit Relief
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Solution Overview
Problem
Existing packaging devices with membrane seals require improved reliability and retention of the closure cap in the pre-positioned state during automated mounting and user operation, while maintaining ease of use and manufacturing simplicity.
Innovation Solution
A packaging device with a closure cap featuring a tubular skirt having separate thread elements and reliefs that snap-fit into a housing on the neck, enhancing the cap's retention in the pre-positioned state through a combination of snap-fitting and rotation-prevention mechanisms, allowing for easier automated mounting and user-friendly operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cap is pre-positioned on the neck using thread elements and ramps, then the cap can be mounted in a standby position, but the cap may become loose or misaligned due to manufacturing and operating tolerances
Solution Approach 1:
The relief on the cap automatically engages with the housing on the neck through a snap-fit mechanism during the pre-positioning operation, self-correcting for manufacturing tolerances without requiring additional adjustment mechanisms or operations
Solution Approach 2:
The snap-fit engagement provides a distinct tactile and audible signal (click sensation) that indicates the cap has reached the correct pre-positioned position, allowing operators to verify proper positioning without visual inspection
2Reliability
If the cap is retained strongly in the pre-positioned position, then the cap is held effectively during packaging and transport, but the force required to remove the cap increases
Solution Approach 1:
The retention mechanism transitions from a static interference fit to a dynamic snap-fit engagement that provides strong retention in the pre-positioned state but allows easy release when force is applied in the removal direction
Solution Approach 2:
The cap positioning system is divided into two independent engagement mechanisms: thread elements for rotational engagement and reliefs for axial snap-fit retention, allowing each to be optimized for its specific function without compromising the other
3Ease of manufacture
If the cap structure is simplified for easy manufacturing, then production costs decrease, but the cap may lack sufficient retention or marking features for reliable pre-positioning
Solution Approach 1:
Multiple functions (thread engagement, positioning, retention, and tactile feedback) are combined into a single integrated cap structure with reliefs that protrude from the cap body, eliminating the need for separate components and complex assembly operations
Solution Approach 2:
The reliefs on the cap serve multiple functions simultaneously: they provide snap-fit engagement with the housing for retention, create tactile feedback for position verification, and guide the cap during the pre-positioning operation
Data Source
AI summary
Device including a cap having a skirt provided with at least one thread element and with at least one relief that is separate from the thread element. A container provided with a neck having at least one screw thread in which the thread element can engage, at least one housing, the relief on the cap being configured to snap-fit in the housing at the end of a movement for pre-positioning the cap on the neck. The preferably has at least one ramp having an opposite slope and at least one space for receiving the thread element in the pre-positioned position, situated between a passage for introducing the thread element into the screw thread and an upright at least partially delimiting said housing.