Elevated Pull Tab Structure for Easier Can Lid Actuation
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Solution Overview
Problem
Conventional pull tab designs, while improving safety by staying attached to the can, often pose challenges for users with limited dexterity or strength due to their flat orientation against the container's lid, necessitating a design that enhances accessibility without increasing production complexity or costs.
Innovation Solution
A pull tab design featuring upward bends on opposing sides of a finger hole to elevate the lift portion, facilitating user actuation and incorporating a center bar with a logo option, which is manufactured using a progressive die method to maintain compatibility with existing manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pull tab is designed with a flat orientation against the container lid, then the manufacturing process remains simple and cost-effective, but the accessibility for users with limited dexterity or strength deteriorates
Solution Approach 1:
The pull tab is elevated from the flat plane of the container lid by forming upward bends at the sides of the finger hole, creating a three-dimensional structure. This elevation provides additional vertical space that improves user accessibility while maintaining compatibility with existing manufacturing processes through progressive die forming
2Ease of operation
If upward bends are added to elevate the lift portion, then user accessibility improves, but the manufacturing complexity increases
Solution Approach 1:
The upward bends are formed as integral features of the pull tab during the blanking process itself, rather than requiring separate post-manufacturing steps. The progressive die is configured to form both the pull tab and the upward bends in a single operation, embedding the accessibility enhancement within the existing manufacturing workflow
Solution Approach 2:
The design specifies precise geometric parameters for the upward bends, including bend angles between 30-45 degrees and elevation distances of 1-2 mm from the bottom plane. These controlled parameter changes ensure consistent performance while maintaining manufacturability through standard progressive die capabilities
3Ease of operation
If the lift portion is elevated by 1-2 mm from the bottom plane, then grasping space is increased for better accessibility, but the structural integrity may be compromised
Solution Approach 1:
The pull tab structure is segmented into distinct functional zones: the elevated lift portion for user interaction, the finger hole region for mechanical advantage, and the base portion for attachment to the container lid. The upward bends are positioned specifically at the sides of the finger hole, creating a configuration where the center bar maintains sufficient thickness (at least 1.9 mm) to preserve structural integrity while providing adequate grasping clearance
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.