Container Cover Stopping Protrusions for Sealing Stability
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Solution Overview
Problem
Existing container assemblies with paper molded cup lids suffer from poor sealing and rotational instability due to weak lateral friction and gaps between components, leading to leakage and easy separation.
Innovation Solution
A container assembly with a cover featuring a connecting portion and stopping protrusions that form a significant frictional contact area with the container, enhancing stability and sealing by creating three tight rings for frictional contact and preventing rotation, while being stackable for space efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the engaging portion and protrusion abut against each other with weak lateral friction force, then the structure is simple, but the container lid and container can easily rotate relative to each other
Solution Approach 1:
The patent transitions from a single-point or single-line contact engagement (prior art) to a distributed areal contact engagement. The engaging portion is designed with multiple contact points distributed across its surface, creating frictional contact in multiple dimensions simultaneously. This areal engagement prevents rotation by distributing stabilizing forces across the entire contact interface rather than relying on weak lateral friction at a single point.
2Ease of manufacture
If a gap is formed among the top end wall, innermost sidewall and protrusion, then the manufacturing is easier, but the sealing effect between the paper molded cup lid and the container is poor
Solution Approach 1:
The engaging portion is designed with flexible, deformable characteristics that allow it to conform to the container's surface profile. When the lid is placed on the container, the engaging portion elastically deforms to fill gaps and conform to the container's curvature, creating a continuous sealing interface. This flexibility compensates for manufacturing tolerances while maintaining reliable sealing without requiring complex precision machining.
3Strength
If the cover and container are designed for secure connection, then the bonding force is strong, but the covers cannot be efficiently stacked and accessed
Solution Approach 1:
The connecting portion is segmented into distinct functional zones: an outer sidewall for frictional contact and sealing, stopping protrusions for rotational prevention, and a recessed structure for stacking. This segmentation allows each zone to perform its specific function independently—the outer sidewall provides bonding force through friction, while the recessed structure enables efficient stacking by providing clear access points and stable stacking surfaces.
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 significantly improves the sealing and stability of the container assembly by increasing the frictional contact area and preventing rotation, effectively preventing liquid leakage and enhancing bonding force, while allowing for efficient stacking and easy access.
Implementation Method 1
Each stopping protrusion has a highest point configured to cooperate with a lowest point of the mouth portion to define a contact area for frictional contact with the mouth portion
Implementation Method 2
The inner and outer sidewalls of each cover are configured to press against and clamp therebetween the mouth portion of the respective container
Data Source
AI summary
A cover of a container assembly includes a cover portion, a connecting portion connected to a periphery of the cover portion, and a plurality of stopping protrusions formed around the outer sidewall. The cover is detachably connected to a mouth portion of a container of the container assembly, and cooperates with the container to define a receiving space. The connecting portion includes an outer sidewall surrounding and pressing against the mouth portion and having an end edge. Each stopping protrusion forms an included angle with the end edge, and has a highest point cooperating with a lowest point of the mouth portion to define a contact area having a height along the axis that is more than 30% of a height of each stopping protrusion along the axis.