Mechanical Panel Locking for Stronger Mitre Joint Assembly
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Solution Overview
Problem
Existing mechanical locking devices in furniture assembly lack sufficient strength and stability, particularly at mitre joints, leading to potential instability and structural issues in assembled products.
Innovation Solution
A mechanical locking system comprising panels with a first edge featuring an edge tongue and a second edge with an edge groove, where the edge tongue is configured to cooperate with the edge groove for locking in two directions, providing large contact surfaces and enhanced rigidity, utilizing a flexible tongue in an insertion groove that is displaceable and angled for increased stability, and incorporating a decorative layer to maintain bevel edges for improved assembly and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a simple mechanical locking device is used, then the device complexity is reduced, but the strength and stability of the joint deteriorates
Solution Approach 1:
The locking device is segmented into multiple functional components: an edge tongue with a tongue groove, an edge groove with a flexible tongue, and a decorative layer. Each component performs a specific locking function in different directions, allowing the system to achieve high strength through distributed functionality rather than a single complex mechanism.
Solution Approach 2:
The flexible tongue is nested within the edge groove, and the tongue groove is nested within the edge tongue structure. This nested arrangement allows multiple locking actions to occur within a compact joint configuration, maintaining strength while controlling overall device complexity.
2Stability of the object's composition
If a rigid locking mechanism is used, then the stability of the joint is improved, but the ease of assembly deteriorates
Solution Approach 1:
The flexible tongue introduces dynamic behavior to the otherwise rigid locking system. The flexible tongue can deform during the assembly process to accommodate the insertion of the edge tongue, then springs back to provide a rigid locked position. This dynamic characteristic enables easy assembly while maintaining joint stability.
Solution Approach 2:
The flexibility parameter of the tongue changes the assembly characteristics. The flexible tongue's ability to deform allows the joint to be assembled with less force and precision requirement, while once locked, the system achieves rigid stability. The parameter change from flexible (during assembly) to rigid (after locking) resolves the contradiction.
3Strength
If the locking surfaces are made large, then the strength of the joint is improved, but the area of the panel required increases
Solution Approach 1:
The locking surfaces are concentrated at the critical joint location rather than distributed across the entire panel. The edge tongue and edge groove create localized large-contact-area locking surfaces precisely where the panels join, providing high strength without requiring increased overall panel area. The decorative layer further localizes the locking function at the joint interface.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly enhances the strength and stability of assembled furniture products by providing a rigid locking mechanism that maintains structural integrity and allows for efficient assembly, even with varying panel thicknesses, while minimizing irregularities and loose fibers.
Implementation Method 1
The edge groove comprises a flexible tongue arranged in an insertion groove, said flexible tongue is configured to cooperate with the tongue groove for locking together the first and the second edges in a second direction which is perpendicular to the junction plane
Data Source
AI summary
A set of panels includes a first panel having a first main plane and a second panel having a second main plane. The panels are provided with a mechanical locking device for locking a first edge of the first panel to a second edge of the second panel. The mechanical locking device includes an edge groove at the first edge, wherein an edge tongue of the second edge is insertable into the edge groove. A flexible tongue is arranged in an insertion groove provided in the edge section groove, and cooperates with a tongue groove provided at the edge section of the second panel. The first and the second panels are locked at a junction plane which is extending between the first main plane and the second main plane. The first edge comprises an edge tongue that extends from the junction plane.