Pail Closure with Biased Tabs and Radial Projections
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Solution Overview
Problem
Existing plastic pail closures, especially those with helical threads, face challenges in securely attaching the lid to the pail without damaging the bridging segments, particularly during falls from elevated positions, and require a mechanism that can be easily released without destruction.
Innovation Solution
A container design featuring a pail with a flange and cover system, where the cover has a tab with apertures that align with radial projections on the flange, allowing for secure locking and easy release, with a biased tab mechanism that ensures the lid remains attached during falls and can be manually opened.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an interference fit derived from snap on application is used, then the lid can be easily applied, but the lid retention becomes problematic during falls from elevated positions
Solution Approach 1:
The closure system is divided into multiple functional components: an inverted U-shaped rim with arcuate engaging portions for initial interference fit engagement, integrally molded threads for secure threaded engagement, and a breakaway segment for controlled separation. This segmentation allows each component to perform its specific function optimally while working together to resolve the contradiction between ease of application and reliable retention.
2Ease of operation
If integrally molded threads are used on the inverted U-shaped rim, then easy opening and closing is achieved, but the bridging segments must be destroyed for separation
Solution Approach 1:
The breakaway segment is designed as a distinct, removable component that can be easily separated from the main body without destroying the integrally molded threads or the inverted U-shaped rim structure. This extraction principle allows the bridging segment to be removed cleanly, enabling easy opening and closing operations while avoiding damage to other components.
3Reliability
If a secure locking mechanism is used to prevent lid separation during falls, then reliability is improved, but the mechanism complexity increases
Solution Approach 1:
Multiple retention functions are merged into a unified closure system: the inverted U-shaped rim provides initial interference fit engagement, the integrally molded threads provide secure threaded engagement, and the breakaway segment enables controlled separation. This merging of functions into a single integrated design achieves reliable lid security during falls without requiring separate complex locking mechanisms, thereby maintaining simplicity while improving reliability.
Data Source
AI summary
A pail having a cylindrical sidewall with an upper margin defining an opening generally equal to the sidewall diameter, a thread projecting outwardly from the sidewall below the upper margin, and at least one flange projecting outwardly from the sidewall below the thread, each flange including one or more radial projections and portions on either side of the radial projections extending outward from the sidewall at least as far as the radial projections. A cover having a central portion received within the opening, a mating portion extending outward from the central potion to engage the sidewall upper margin, a downwardly projecting rim including at least one inwardly directed thread to engage the thread projecting outwardly from the pail sidewall, and at least one tab integrally coupled to the downwardly projecting rim including one or more apertures corresponding to the plurality of radial projections, each tab being biased for displacement from an outwardly displaced disengaged position toward a more inward position with the radial projections being received in the apertures to lock the cover onto the top of the pail to enclose any contents of the pail, each tab including a lower edge extending sufficiently below the apertures to provide a grip allowing a manual outward force to be applied to disengage the tab apertures from the flange radial projections.