Wide-neck Plastic Container Locking Projections Anti-tampering
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Solution Overview
Problem
Wide-neck plastic containers with non-rotationally symmetrical necks pose challenges in securing closure attachments, requiring precise alignment and manufacturing, leading to increased tool costs and potential tampering issues.
Innovation Solution
A plastic wide-neck container design featuring axially extending locking projections on the outer wall and corresponding receptacles on the inner wall of the closure attachment, forming a non-releasable lock and anti-twist mechanism, with centering elements for precise alignment and assembly, ensuring secure fixation and easy detection of manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If locking means are designed as annular ribs and annular locking projections for rotational symmetry, then assembly is easier and alignment is simpler, but secure fixation against manipulation is insufficient for non-rotationally symmetrical containers
Solution Approach 1:
The patent applies asymmetry by providing locking projections at specific positions on the container neck that correspond to specific positions of locking receptacles on the closure attachment. This asymmetric arrangement ensures that the closure attachment can only be assembled in the correct orientation, providing both easy assembly through positive engagement and reliable anti-tampering security by preventing rotation or misalignment.
2Reliability
If additional anti-twist devices are provided to prevent closure removal by turning, then security against manipulation is improved, but manufacturing precision requirements and tool costs increase significantly
Solution Approach 1:
The patent merges the locking function and anti-twist function into a single integrated system. The locking projections and locking receptacles are designed to engage in a way that simultaneously prevents removal and rotation. The geometric configuration of the locking elements themselves provides the anti-twist mechanism, eliminating the need for separate anti-twist devices and reducing manufacturing precision requirements.
Solution Approach 2:
The locking projections and receptacles serve multiple functions: they provide the primary locking mechanism to prevent closure removal, act as anti-twist devices through their asymmetric geometric configuration, and guide alignment during assembly. This multi-functionality reduces the overall complexity and manufacturing precision requirements compared to having separate dedicated components for each function.
3Reliability
If locking projections and receptacles are positioned precisely to ensure secure fixation, then anti-tampering security is improved, but device complexity and tool requirements increase
Solution Approach 1:
The locking projections are pre-formed as integral parts of the container neck structure during the molding process, and the locking receptacles are pre-formed on the closure attachment. This preliminary action ensures precise positioning is built into the components themselves, eliminating the need for complex post-assembly positioning tools or adjustable mechanisms while maintaining secure fixation.
Data Source
Figure 1
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Figure 5~6
AI summary
The invention relates to a wide-neck plastic container (1) produced using extrusion blow moulding and having a closure cap (4) that can be non-detachably connected to a container neck (3) of the wide-neck plastic container (1), said container neck having a container opening (30). A number of locking projections (32), that are hollow as a result of the manufacturing method, are arranged on an outer wall (31) of the container neck (3), said projections being distributed over a periphery of the container neck (3) and projecting from the outer wall (31) of the container neck (3). An inner wall of the casing of the closure cap (4) is provided with corresponding locking recesses (52). In the case of the closure cap (4) mounted on the container neck (3), the interlocked locking elements (32, 52) are inaccessibly covered by a section of the casing (41) of the closure cap (4).