Mechanical Panel Locking Joint for Gap-Free Curved Furniture Edges
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Solution Overview
Problem
Existing furniture assembly techniques using mechanical locking devices often result in weak joints and visible gaps, particularly at the front edges of panels with curved shapes, which compromise the strength and aesthetics of the final product.
Innovation Solution
A mechanical locking device comprising a dowel and dowel groove system, where the dowel is positioned at a specific distance from the panel's corner, and a flexible tongue mechanism that cooperates with a tongue groove to lock edges together, minimizing gaps and enhancing joint strength, especially when the panels have curved edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical locking device is used to join panels, then the panels can be locked together, but visible gaps appear at the junction plane especially at front edges
Solution Approach 1:
The dowel groove is pre-positioned at a greater distance from the outer corner of the second panel than the dowel is from the outer corner of the first panel. This preliminary asymmetric positioning ensures that when the dowel is inserted, it presses the first edge against the second edge, preventing gap formation at the junction plane before the final locking occurs
Solution Approach 2:
The locking device employs different positioning characteristics at different locations: the dowel is positioned at a specific offset from the corner on the first panel, while the dowel groove is positioned at a different offset on the second panel. This local differentiation in positioning creates the pressing effect that eliminates gaps at the visible front edges
2Shape
If panels with curved shapes are joined, then aesthetic appearance is improved, but gaps appear at the junction plane
Solution Approach 1:
The asymmetric dowel and dowel groove positioning is established in advance during manufacturing, creating a built-in pressing mechanism that compensates for the curvature of the panel edges. This preliminary action ensures that curved edges remain in contact at the junction plane, maintaining both aesthetic appearance and gap-free joints
3Ease of manufacture
If the dowel is positioned closer to the corner, then assembly is simplified, but the joint strength decreases
Solution Approach 1:
The locking device utilizes asymmetric positioning where the dowel and dowel groove are at different distances from their respective panel corners. This asymmetry creates a lever effect that increases joint strength while maintaining assembly simplicity, as the asymmetric positioning is built into the device design rather than requiring complex adjustment during assembly
Data Source
AI summary
A set of panels including a first panel with a first main plane and a second panel with a second main plane. The first and the second panel include a mechanical locking device which is configured for locking a first edge of the first panel to a second edge of the second panel at a junction plane. The first main plane is essentially perpendicular to the second main plane and the junction plane is extending between the first main plane and the second main plane. The mechanical locking device includes at the first edge an edge tongue which extends from the junction plane and at the second edge includes an edge groove at the junction plane. The mechanical locking device includes a dowel at the first edge and a dowel groove at the second edge. The dowel is configured to cooperate with the dowel groove.