Curved-Tab Panel Interlocking for Strong, Material-Saving Cartons
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Solution Overview
Problem
Existing carton locking mechanisms are inefficient in securing panels together while minimizing material usage and ensuring strength and security, particularly for carrying heavy loads.
Innovation Solution
A panel interlocking device featuring a male tab with concavely curved side edges and a female tab with concavely or convexly curved locking aperture, allowing for secure engagement and enhanced structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional locking tabs with straight edges are used, then the structure is simple and easy to manufacture, but the panel security and strength are insufficient
Solution Approach 1:
The patent applies curvature to the tab structure by providing tabs with curved edges instead of straight edges. The curved edges engage with corresponding curved recesses in the retaining tab, creating a more secure interlocking mechanism that prevents panel separation while maintaining manufacturing feasibility through standard forming processes.
2Strength
If more material is used to strengthen the carton, then the strength and security improve, but material waste increases
Solution Approach 1:
The patent applies local quality by concentrating material strength at specific critical locations rather than uniformly throughout. The curved edges of the tabs are positioned at precise locations where panel separation is most likely to occur, providing localized reinforcement that enhances overall carton strength without requiring excessive material usage across the entire structure.
3Ease of manufacture
If the locking mechanism is simplified, then manufacturing cost decreases, but the ability to hold heavy loads is compromised
Solution Approach 1:
The curved geometry of the tabs and corresponding recesses creates a mechanical interlocking action that distributes load forces more effectively than straight-edged tabs. The curvature allows for gradual engagement and load transfer, enabling the simplified tab structure to accommodate heavy loads while remaining easy to manufacture through standard forming processes.
Data Source
AI summary
Aspects of the disclosure relate to a panel interlocking device, a carton, and a blank for forming the carton. The carton blank incorporating a panel interlocking device for securing together a first and a second panel in overlapping relationship. The panel interlocking device comprises a locking tab struck from the first panel, and a retaining tab defining a locking aperture struck from the second panel. In use the retaining tab is displaced out of the plane of the second panel to receive said locking tab through the locking aperture to be engaged therewith. The retaining tab has opposing side edges each concavely curved as viewed from the outside of the retaining tab.