Container Cap Bridge Notch Torque Resistance
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Solution Overview
Problem
Existing container caps are prone to deflection during tightening, leading to compromised leak-tight sealing and inadequate resistance against impact forces, which can result in undesired leakage and poor locking strength, especially during transportation and accidental knocks.
Innovation Solution
A cap design featuring a bridge-type portion with a flat notch that contacts the container neck, allowing for high torque resistance without significant deflection, combined with a locking mechanism that ensures secure closure against impact while being easy to open and close, particularly single-handedly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cap is tightened to ensure leak-proof sealing, then the sealing reliability is improved, but the cap body experiences deflection which compromises the sealing and locking strength
Solution Approach 1:
The cap body is segmented into multiple functional zones: a bridge-type portion for structural support, a flat notch for contact with the container neck, and a threaded portion for engagement. This segmentation allows each zone to perform its specific function optimally while distributing the tightening forces to minimize deflection.
Solution Approach 2:
The cap body is formed from a polymeric material that combines rigidity for structural support with sufficient elasticity to absorb tightening forces without permanent deformation. This composite material approach enables the cap to maintain its shape and locking strength while achieving leak-proof sealing.
2Reliability
If the cap is tightened with high torque to prevent leakage during transportation, then the sealing is improved, but the cap body deflects significantly which reduces locking strength
Solution Approach 1:
The flat notch is pre-formed in the bridge-type portion at a specific distance (2mm to 3mm) from the apex. This preliminary structural preparation ensures that when torque is applied during tightening, the contact point is predetermined and optimized to minimize deflection while maintaining sealing effectiveness against impact forces.
Solution Approach 2:
The bridge-type portion with flat notch introduces a new dimensional feature that contacts the container neck in a specific location, creating a stable contact point that distributes torque forces. This dimensional addition transforms the cap body's torque resistance by creating a lever arm that reduces deflection.
3Ease of operation
If a hinged lid with protrusion sealing is used to enable easy opening and closing, then the ease of operation is improved, but the sealing may leak under high pressure from impact forces
Solution Approach 1:
The lid integrates multiple sealing mechanisms: the protrusion for basic sealing during normal operation, and the disposable sealing means for enhanced sealing under high pressure. This merging of sealing approaches maintains ease of operation while ensuring reliability under impact forces throughout the supply chain.
4Strength
If the cap is designed for strong locking to resist impact forces, then the locking strength is improved, but the operation becomes more difficult particularly for single-handed use
Solution Approach 1:
The locking mechanism incorporates dynamic elements including the elastically deformable material that provides automatic engagement and the movable lid that transitions between open and closed positions. This dynamic design allows strong locking under impact while maintaining ease of operation through natural spring-back and mechanical advantage.
Data Source
Figure 1A~2
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AI summary
A cap resistant to impact forces and providing a leak-tight fitting to a container whilst allowing simple and quick release.