Tamper-Evident Cap Ring Assembly With Low-Force Twist Lock
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Solution Overview
Problem
Existing closure assemblies with tamper-evident rings face challenges in assembly complexity and require high forces during cap securing, leading to potential damage to equipment and difficulty in securing both screw and snap caps.
Innovation Solution
A closure assembly design featuring an oblong tamper-evident ring member with retention members and windows that allows for a combined axial and rotational securing motion, reducing assembly forces and ensuring the ring remains fixed after opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional tamper-evident ring with circular lower end is used, then the assembly process requires high axial forces that can damage equipment, but the tamper-evident ring can be securely fixed to the neck
Solution Approach 1:
The lower end of the tamper-evident ring is designed with an oblong shape instead of a circular shape. This asymmetric geometry allows the retention members to engage with the retention windows during rotation, enabling the cap to be secured with significantly reduced axial forces while still achieving secure fixation of the tamper-evident ring to the neck
2Device complexity
If the cap is secured using only axial motion, then the assembly is simple, but the retention members cannot properly engage with the retention windows to fix the tamper-evident ring
Solution Approach 1:
The assembly process transitions from purely axial motion to a combined axial and rotational motion. The oblong shape of the lower end requires rotational movement to allow the retention members to align with and engage the retention windows, while the axial motion provides the securing force. This two-dimensional motion approach ensures reliable engagement while maintaining assembly simplicity
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
Facilitates easier assembly, reduces equipment stress, and maintains the tamper-evident ring's position post-opening, enhancing user experience and assembly efficiency.
Implementation Method 1
the retention members will elastically deform the tamper-evident ring member until a snap-fit connection is established between the retention members and the retention windows
Data Source
Figure 1
Figure 2
Figure 3a~3c
AI summary
A closure assembly comprising an article and comprising a cap provided with an integrated tamper-evident ring member. The article has a neck around a product passage. The tamper-evident ring member is adapted to be secured on the neck of the article by means of a securing motion which comprises both an axial and rotational component, and the tamper-evident ring member is connected to the cap body via breakable bridges. The neck and tamper-evident ring member are provided with retention members and windows respectively which block axial and rotational movement of tamper-evident ring member with respect to the neck. The tamper-evident ring member has an oblong shape at the lower end.