Closure Cap Retaining Strip Geometry for Stable Open Position
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Solution Overview
Problem
Existing closure caps with tamper-proof rings face issues where the unscrewed threaded part hinders pouring and can be easily torn off, leading to instability and user inconvenience.
Innovation Solution
A closure cap design featuring a single retaining strip with specific angular dimensions and breaking elements that provides a restoring force to maintain the threaded part in an open position, ensuring stability and secure attachment to the container neck, while minimizing additional space and height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single retaining strip is used instead of two retaining strips, then the device complexity is reduced and manufacturing is simplified, but the stability and reliability of holding the threaded part may be compromised
Solution Approach 1:
The patent changes the geometric parameters of the retaining strip, specifically extending it to span a first angle of 30-50 degrees along the circumference of the tamper-proof ring. This parameter change allows a single strip to provide sufficient restoring force and stable holding of the threaded part, replacing the need for two separate strips while maintaining reliability.
Solution Approach 2:
The retaining strip is divided into functional segments: a first connection to the threaded part extending over a second angle of 10-25 degrees, and a second connection to the tamper-proof ring extending over a third angle of 6-10 degrees. This segmentation allows the single strip to perform multiple functions (holding and restoring) reliably.
2Stability of the object's composition
If the retaining strip is made short to enable restoring force, then the open position stability is improved, but the connection strength may be reduced
Solution Approach 1:
The patent optimizes the cross-sectional dimensions of the retaining strip, setting the area between 1.5 mm² and 2.5 mm². This parameter change ensures the strip is short enough to provide restoring force for stable open position while maintaining sufficient connection strength through optimized cross-sectional area.
Solution Approach 2:
The retaining strip has different local properties: it is short in the longitudinal direction to provide restoring force, but has an optimized cross-sectional area (1.5-2.5 mm²) at the connection points to ensure sufficient strength. This local quality differentiation resolves the contradiction between short length and connection strength.
3Reliability
If the first connection angle is increased to 10-25 degrees, then the connection stability between retaining strip and threaded part is improved, but the device complexity increases
Solution Approach 1:
The patent defines specific angular parameters for the first connection (second angle of 10-25 degrees) that optimize connection stability. By establishing clear parameter ranges, the invention achieves reliable connections without excessive geometric complexity, as the angles are within practical manufacturing limits.
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 design provides a stable and secure open position for the threaded part, preventing unintentional tearing and ensuring the cap remains attached during use, with intuitive user guidance and minimal material usage.
Implementation Method 1
The angular dimension enables the formation of a relatively short retaining strip which has a restoring force or a spring force and can press the threaded part against the container neck in the opened state
Data Source
AI summary
The invention relates to a closure cap for closing the pour opening of a container, having a cylindrical threaded part, which has an open edge and an internal thread which is formed on the inside and can interact with an external screw thread of a container neck of the container, a tamper-proof ring which is designed to be held on a protrusion formed on the container neck, and a retaining strip having a first and a second end. In the unopened state, the retaining strip is arranged between the threaded part and the tamper-proof ring and along the circumference of the tamper-proof ring and extends in an arc with a first angle ranging from 30 to 50 degrees. Third predetermined breaking elements are arranged in that portion of the threaded part in which threaded part and tamper-proof ring lie directly on top of each other.