Pull Tab Lift Geometry for Easier Can Lid Actuation
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Solution Overview
Problem
Existing pull tab designs face challenges in accessibility for users with limited dexterity or strength, particularly with stay-on-tab designs, while maintaining cost-effective and efficient manufacturing processes.
Innovation Solution
A pull tab design featuring upward bends on opposing sides of the finger hole to elevate the lift portion, combined with a cooperative indentation in the container lid, providing enhanced user accessibility and allowing for logo stamping, and facilitating efficient stacking during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lift portion is elevated using upward bends, then user accessibility and grasping ease are improved, but manufacturing complexity increases
Solution Approach 1:
The lift portion is elevated from the plane of the container lid by forming upward bends at 45-degree angles, creating a three-dimensional structure that rises vertically. This dimensional change allows users to grasp the lift portion more easily without requiring additional manufacturing steps or complex assembly processes
Solution Approach 2:
The upward bends are formed at specific angles (30-50 degrees, preferably 45 degrees) to create curved lifting surfaces that are more ergonomic for finger placement. The curved geometry provides natural hand positioning and mechanical advantage while maintaining simplicity in the forming process
2Ease of operation
If the lift portion is elevated above the container lid plane, then grasping ease is improved, but stacking efficiency during manufacturing may be reduced
Solution Approach 1:
The upward bends elevate the lift portion vertically by 1-2 mm above the container lid plane, creating clearance that facilitates finger insertion and grasping. This minimal vertical displacement maintains compatibility with automated stacking processes while significantly improving user accessibility
Solution Approach 2:
The elevation distance is precisely controlled within specific parameters (1-2 mm above the lid plane, with upward bends positioned 1-6 mm from the lift portion). These controlled parameter changes optimize both grasping ease and stacking efficiency by providing sufficient clearance for user interaction without excessive height that would interfere with manufacturing
3Ease of operation
If upward bends are added to the pull tab, then accessibility for users with limited dexterity is improved, but production costs may increase
Solution Approach 1:
The upward bends are formed using standard progressive die stamping processes that create 45-degree angled lifting surfaces. These curved features are integrated into the existing pull tab forming operation, utilizing conventional manufacturing capabilities without requiring additional production steps or specialized equipment
Solution Approach 2:
The upward bends are combined with the existing pull tab structure and forming process. The finger hole is positioned within the upward bend structure, merging multiple features into a single integrated component that can be manufactured in one stamping operation, thereby avoiding additional production costs
Data Source
AI summary
A pull tab for a container lid includes a nose configured to apply downward pressure on a frangible region of the container lid, a rivet receiving portion adjacent to the nose that includes a rivet aperture therethrough, a lift portion located distally from the nose, and a finger hole located in proximity to the lift portion. Side edges of the finger hole include one or more upward bends, placed such that the lift portion is elevated relative to a bottom plane of the pull tab, thereby facilitating user actuation of the pull tab and enabling efficient stacking of a plurality of the container lids during manufacturing thereof to facilitate shipment and storage thereof. An indentation formed in the container lid cooperative with the lift portion provides additional grasping space. Novel methods of manufacturing are also disclosed.