Closure Cap Engaging Lug Geometry for Safer Snap-Open Use
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Solution Overview
Problem
Existing closure caps with security strips suffer from mechanical instability, lack of user feedback during opening, and potential injury risks due to sharp edges, especially under high tensile stress.
Innovation Solution
The closure cap features a reinforced engaging lug with a first ramp that increases in radial height, flanked by second and third ramps, providing mechanical stability and minimizing edge exposure, along with a U-shaped design and rounded edges to enhance user safety and haptics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the engaging lug is made with a simple design to minimize material usage, then manufacturing cost is reduced, but the lug bends under tensile stress from the retaining strips
Solution Approach 1:
The engaging lug is designed with a ramped geometry featuring curved surfaces and rounded transitions rather than sharp edges. The ramp profile with gradual height increase from the open rim provides both structural reinforcement and aesthetic smoothness, eliminating sharp corners while maintaining mechanical strength under tensile stress.
Solution Approach 2:
The engaging lug incorporates localized reinforcement features including a ramped profile with varying thickness and a reinforcing rib at critical stress points. The U-shaped configuration with increased wall thickness at the base provides targeted strength enhancement where tensile stresses are highest, without unnecessarily increasing overall complexity.
2Manufacturing precision
If the engaging lug is designed with sharp edges for precise engagement, then engagement accuracy is improved, but user safety is compromised due to injury risk
Solution Approach 1:
All edges of the engaging lug are rounded to eliminate sharp corners that could cause injury. The ramped geometry features smooth, gradual transitions rather than abrupt edges, maintaining precise engagement capability while ensuring user safety. The rounded profile allows the lug to snap into place accurately without exposing harmful sharp edges.
Solution Approach 2:
The design converts what would normally be sharp, potentially harmful edges into rounded, safe surfaces. The ramped geometry naturally eliminates sharp corners while maintaining the functional engagement precision, turning a potential harm into a safety feature without compromising the engagement function.
3Reliability
If the threaded part is held close to the container for secure closure, then sealing is improved, but user feedback during opening is reduced due to limited movement
Solution Approach 1:
The threaded part is designed to be movable relative to the container, transitioning from a closed position where it seals the opening to an open position where it can be folded away. The engaging lug with its ramped geometry provides dynamic movement capability, allowing the threaded part to move freely during opening while maintaining secure sealing when closed.
Solution Approach 2:
The engaging lug is designed to provide tactile feedback to the user during the opening process. As the threaded part moves into the open position, the ramped geometry creates audible and tactile sensations that inform the user of the opening progress and final locked position, improving ease of operation while maintaining sealing reliability.
Data Source
AI summary
A closure cap for closing the pouring opening of a container includes a cylindrical threaded part which has an open rim, a first cylindrical shell, and an internal thread, which is formed on the interior of the shell and can interact with an external thread of a container neck delimiting the pouring opening; a security ring, which is designed to be held on a projection formed on the container neck. The closure cap includes a first retaining strip having a first and a second end, wherein the first end is rigidly connected to the open rim of the threaded part and the second end is rigidly connected to the security ring; and a second retaining strip, having a third and a fourth end, wherein the third end is rigidly connected to the open rim of the threaded part and the fourth end is rigidly connected to the security ring.