Container Lid Press-Fit Seal Mechanism
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Solution Overview
Problem
Existing containers with lids made from sheet-formed synthetic resin materials face challenges in achieving high sealability due to the weakness and susceptibility to deformation of skirt portions, leading to inadequate seal integrity when screw-threaded or projection-based sealing mechanisms are used.
Innovation Solution
A container design featuring a press-fit mechanism where the lid is guided by a guide surface on the container body, with ledge portions on the lid interacting with a flange portion and guide portions on the container body to form a circumferential liquid-tight seal, utilizing a press-fit state that is resistant to deformation and ensures high sealability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw-threaded portions are provided on skirt portions of container body and lid to enable attachment and detachment, then sealability is improved, but the skirt portions are weak and susceptible to deformation, reducing reliability
Solution Approach 1:
The invention divides the sealing function into two distinct locations: the skirt portions are separated from the screw-threaded portions. The screw-threaded portions are placed on the flange portions (stronger, more rigid sections), while the skirt portions remain simple and weak but are no longer required to bear the sealing load. This segmentation allows each part to optimize its function without compromising the other.
Solution Approach 2:
The flange portions serve as intermediaries that transfer the sealing function from the weak skirt portions to the stronger flange portions. The screw-threaded portions on the flanges engage to provide the sealing force, while the flange portions themselves act as the structural mediators that can withstand the mechanical stresses of threading and engagement without deforming.
2Reliability
If engaging portions are interlocked on skirt portions to ensure close contact, then sealability is improved, but the sheet-formed skirt portions deform easily, reducing reliability
Solution Approach 1:
The invention segments the functional requirements: the skirt portions provide simple structural connection and are left stable and undeformed, while the flange portions provide the complex interlocking engagement and sealing function. This segmentation prevents the weak skirt portions from being subjected to deformation-inducing forces.
Solution Approach 2:
The flange portions act as intermediaries that perform the sealing and interlocking functions. The strong flange portions can withstand the forces required for engagement without deforming, while the weak skirt portions remain stable and undeformed since they do not perform the sealing function.
3Ease of operation
If screw-threaded portions with the same shape are formed on sheet skirt portions, then attachment is enabled, but forming difficulty increases and sealability cannot be ensured
Solution Approach 1:
The invention segments the structural features: simple skirt portions that are easy to form from sheet material, and separate flange portions that contain the screw-threaded features. This segmentation makes the skirt portions easy to manufacture while the flange portions provide the necessary attachment functionality.
Solution Approach 2:
The invention applies local quality by making the flange portions have different properties than the skirt portions. The flange portions are designed with screw-threaded features and greater rigidity to handle attachment, while the skirt portions remain simple and flexible for easy forming. Each location has the appropriate local properties for its specific function.
4Reliability
If projection body and groove are formed over entire circumference for sealing, then sealability is improved, but the structure becomes complex and pressing force is insufficient
Solution Approach 1:
The invention segments the sealing mechanism into discrete elements: projection bodies and grooves are placed at specific locations on the flange portions rather than continuing around the entire circumference. This segmentation reduces the total number of features and simplifies the overall structure while maintaining effective sealing at the critical interface.
Solution Approach 2:
Instead of providing sealing features over the entire circumference (excessive action), the invention uses partial action by placing projection bodies and grooves only at specific locations where sealing is most critical. This partial approach achieves sufficient sealability with reduced structural complexity.
Data Source
AI summary
A container body (20) includes an upper opening portion (21) having a container internal sidewall portion (22) and a container side skirt portion (24). A lid (10) includes a lid internal sidewall portion (12) and a lid side skirt portion (14). Two or more ledge portions (15) protruding inward are formed on the lid side skirt portion (14). The container side skirt portion (24) includes a first guide portion (30) for guiding downward the ledge portions (15) when the lid (10) is attached. When the lid is closed, the lid (10) is drawn into the side of the container body (20). Thus, a seal portion formed between the container internal sidewall portion (22) and the lid internal sidewall portion (12) is press-contacted, in the state of which the seal portion secures high sealability. Further, the length of the lid side skirt portion (14) is increased so as to cover the lower end of the container side skirt portion (24) with a lower portion of the lid side skirt portion (14) when the lid is attached or detached, whereby the fingertips can be prevented from being scratched.