Adjustable Cap Assembly Minimizing Gap Between Glass Container and Plastic Closure
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Solution Overview
Problem
Achieving a close, snug fit between cap and container components made of different materials, such as glass and plastic, is challenging due to manufacturing tolerances, leading to potential gaps that affect both aesthetics and functionality.
Innovation Solution
The cap assembly features adjustable inner and outer components, with the inner component installed first, allowing the outer cap to be adjusted onto the inner sleeve using ratchet teeth and pawls to minimize the gap between the cap and container shoulder, enabling a snug fit without adhesives and suitable for various container shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a cap assembly made of plastic is installed on a glass container, then the assembly can be produced, but achieving a close, snug fit is difficult due to manufacturing tolerance differences between materials
Solution Approach 1:
The cap assembly is divided into an inner cap component and an outer cap component. The inner cap is installed on the container neck first, and the outer cap is then fitted over the inner cap. This segmentation allows each component to be manufactured with standard tolerances while achieving an overall snug fit through the layered structure.
Solution Approach 2:
The inner cap acts as an intermediary element between the glass container and the outer cap. It provides a mating surface that accommodates tolerance variations in the glass container, allowing the outer cap to fit consistently without requiring tight tolerance control on the glass component.
2Ease of manufacture
If the cap and container components are made with standard manufacturing tolerances, then production is simplified, but gaps appear between the cap and container affecting aesthetics and functionality
Solution Approach 1:
The outer cap is designed with movable adjustment features that allow it to be positioned dynamically during assembly. The outer cap can be adjusted axially along the inner cap to eliminate gaps, providing a snug fit that adapts to variations in container dimensions without requiring precision manufacturing.
Solution Approach 2:
The design allows for adjustment of the outer cap's position parameter relative to the container. By changing the axial position of the outer cap during assembly, the gap between the cap and container can be minimized or eliminated, achieving a snug fit despite standard manufacturing tolerances.
3Manufacturing precision
If the outer cap is made adjustable relative to the inner cap, then a snug fit is achieved, but the assembly process becomes more complex
Solution Approach 1:
The inner cap is installed on the container neck as a preliminary step before fitting the outer cap. This preliminary action establishes a stable base that guides the outer cap into position, simplifying the subsequent adjustment and assembly process.
Solution Approach 2:
The outer cap is designed to self-adjust during assembly through its interaction with the inner cap. The components work together to automatically position the outer cap in the correct location, reducing the need for complex adjustment mechanisms or skilled assembly operations.
Data Source
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AI summary
A cap assembly for a container has an inner sleeve that is secured to the neck of the container and an outer cap that is adjustably secured to the inner sleeve. The outer cap can be adjusted downwardly relative to the inner sleeve so that a gap between the bottom of the outer cap and a top of the container can be minimized or eliminated.