Curved Base Cup Mechanical Engagement for Pressurizable Containers
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Solution Overview
Problem
Pressurizable containers with irregular bases, such as hemispherical bottoms, face challenges in standing upright on horizontal surfaces due to their design, and existing attachment methods like groove/projection systems or adhesives are unsightly and costly, while dip tubes often fail to reach the contents correctly.
Innovation Solution
A container with a 45-degree bottom cone and a base cup featuring a mechanical engagement system that provides a friction fit or snap fit without adhesives, allowing the container to sit upright and maintain stability under pressure without visible lines or additional material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hemispherical or curved base is used to resist pressure, then the container can withstand pressure better, but the container cannot sit upright on horizontal surfaces
Solution Approach 1:
The base is segmented into two functional parts: a hemispherical or curved bottom portion for pressure resistance, and a separate flat base cup for upright stability. This segmentation allows each part to fulfill its specific function without compromise.
Solution Approach 2:
The base cup is designed to fit over the hemispherical bottom, creating a nested structure where the curved bottom is contained within the flat base cup. This nesting arrangement combines the pressure-resistant curved bottom with the stable flat base.
2Reliability
If a groove/projection engagement system is used to attach the base cup, then mechanical attachment is achieved, but an unsightly line or ridge appears at the interface
Solution Approach 1:
The engagement system is extracted from the visible exterior interface and relocated to the interior of the base cup. The groove and projection features are positioned so that they do not create visible lines or ridges on the outer surface, separating the functional attachment mechanism from the aesthetic exterior.
Solution Approach 2:
The base cup acts as an intermediary element that provides both the engagement system for secure attachment and a smooth exterior surface. The engagement features are concealed within the base cup structure, allowing the exterior to remain aesthetically pleasing.
3Reliability
If adhesive attachment is used to join the base cup to the container, then secure attachment is achieved, but additional material cost and manufacturing complexity increase
Solution Approach 1:
The base cup and container bottom provide self-service attachment through their own geometric features. The groove and projection engagement system allows the components to attach to each other without requiring external adhesives or additional fastening materials.
Solution Approach 2:
The chemical bonding mechanism of adhesives is replaced with a purely mechanical engagement system. The groove and projection features create a mechanical interlock that provides secure attachment without requiring adhesive materials or complex bonding processes.
4Reliability
If the engagement interface is made robust for drop tests, then dynamic attachment is ensured, but the line or ridge at the interface becomes more pronounced
Solution Approach 1:
The robust engagement features are extracted from the exterior interface and placed inside the base cup. This allows the interface to remain smooth and aesthetically pleasing while the interior engagement system provides the necessary robustness for drop tests and dynamic conditions.
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 solution enables containers to stand upright on horizontal surfaces, withstand pressure, and maintain aesthetic appeal while reducing material costs and manufacturing complexity, ensuring secure attachment and efficient dispensing without waste.
Implementation Method 1
The groove/projection system is typically disposed near the curved bottom of the container... The base cup is a complementary projection or groove, which engages the groove or projection of the container. Such engagement provides a mechanical fit which prevents separation of the base cup from the container during ordinary use.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A container (10) having a curved bottom (12) and base cup (20) which allows the container to stand upright. The container and base cup are fitted together by a mechanical engagement (32) having portions on the container and base cup. The mechanical engagement of the container is disposed within the bottom cone of the container. The mechanical engagement of the base cup is cantilevered from the bottom of the base cup. Such disposition reduces stress at the interface between the side wall of the container and edge of the base, providing for a smoother transition and better appearance. Also, this disposition provides resistance to separation of the container and base cup during drop impact. The bottom of the container may be curved and have a well therein for receiving the contents of the container and a dip tube.