Can Lid Tab With Inclined Finger Hook for Seamed-Edge Clearance
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Solution Overview
Problem
Conventional can lids with positive internal pressure face issues where the finger hook portion of the tab protrudes above the seamed portion, leading to potential catching during conveyance and handling, especially when the can expands into a dome shape.
Innovation Solution
The can lid tab design features a finger hook portion with an inclined upper surface and/or recessed surfaces to prevent protrusion above the seamed portion by maintaining a lower height position during dome expansion, ensuring improved conveyance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional tab design is used in a positive pressure can, then the tab structure is simple, but the finger hook portion protrudes above the seamed portion causing catching during conveyance and handling
Solution Approach 1:
The patent applies local quality by creating an inclined upper surface specifically on the rear end side of the finger hook portion, while other parts of the tab maintain their conventional structure. This localized modification ensures the finger hook portion does not protrude above the seamed portion during dome expansion, preventing catching issues without unnecessarily complicating the overall tab structure.
Solution Approach 2:
The patent introduces a dimensional change by inclining the upper surface of the finger hook portion at a specific angle (α) relative to the horizontal plane. This angular orientation in the vertical dimension allows the finger hook to maintain a lower height position during pressure-induced expansion, solving the protrusion problem through spatial reconfiguration rather than structural complexity.
2Reliability
If the can lid expands into a dome shape under positive internal pressure, then the can maintains pressure integrity, but the finger hook portion of the tab protrudes above the seamed portion
Solution Approach 1:
The inclined upper surface is applied specifically to the rear end side of the finger hook portion, creating a localized geometric feature that compensates for the dome-shaped expansion. This local modification allows the tab to accommodate pressure-induced deformation while maintaining proper positioning relative to the seamed portion.
Solution Approach 2:
The patent changes the geometric parameter of the finger hook portion by introducing an inclined surface with a specific angle (α). This parameter change allows the tab structure to adapt to the dome-shaped expansion under positive pressure, ensuring the finger hook remains positioned below the seamed portion while the can maintains its pressure integrity.
Data Source
AI summary
A can lid tab includes a flat plate-shaped attachment portion including a rivet hole to be attached to a rivet portion provided in a panel portion of a can lid, the attachment portion being in contact with the panel portion; a tip portion continuous with the attachment portion; and a finger hook portion formed on a side opposite to the tip portion across the attachment portion, at least an upper surface on a rear end side of the finger hook portion being inclined downward from the tip portion side toward the rear end side with respect to the attachment portion.