Serrated Recess Joint Geometry for Clamp-Free Interference Fit
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Solution Overview
Problem
The existing methods for forming mortise and tenon joints in furniture and cabinetmaking require clamping devices to secure bonding agents, leading to inventory management issues, increased labor, and potential damage to materials.
Innovation Solution
A method involving the formation of a recess with serrated side walls in one workpiece and a corresponding insertable portion with sloped surfaces in another, creating an interference fit when inserted, eliminating the need for clamps by using a CNC router to machine the serrated configurations and allowing a bonding agent to set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If clamping devices are used to secure bonding agents, then the joint strength is improved, but the device complexity and inventory requirements increase
Solution Approach 1:
The recess structure provides self-clamping functionality through its geometric design. The angled sides of the recess create a mechanical interference fit with the insertable portion, allowing the joint to secure itself without external clamping devices. The bonding agent is retained by the recess geometry rather than requiring separate clamping mechanisms.
Solution Approach 2:
The clamping function is extracted from separate clamping devices and integrated into the recess structure itself. The recess geometry inherently provides the securing mechanism through its angled sides that create friction and mechanical retention, eliminating the need for external clamps.
2Adaptability or versatility
If multiple clamping devices are used to accommodate various workpieces, then the adaptability is improved, but the inventory requirements and loss of substance increase
Solution Approach 1:
The recess structure serves multiple functions: it provides mechanical retention through its angled sides, retains the bonding agent through its cavity design, and accommodates various insertable portions through its geometric configuration. This multi-functional design eliminates the need for separate clamping devices for different workpiece types.
Solution Approach 2:
The recess structure is self-sufficient, providing both the bonding agent retention and the clamping function through its own geometry. The angled sides create a self-adjusting interference fit that adapts to different insertable portions without requiring external clamping devices.
3Reliability
If manual clamping operations are performed, then the joint securing is improved, but the labor requirements and production time increase
Solution Approach 1:
The joint assembly is self-securing through the interference fit created by the angled recess sides. When the insertable portion is inserted, the geometry automatically creates the clamping force needed to secure the bonding agent, eliminating manual clamping operations and accelerating assembly.
Solution Approach 2:
The recess geometry is pre-configured with angled sides that will automatically create the necessary clamping force during insertion. This preliminary geometric configuration ensures reliable joint securing occurs automatically as part of the assembly process, without requiring subsequent manual clamping steps.
4Strength
If conventional mortise and tenon joints are used, then the joint strength is improved, but the manufacturing complexity and number of operations increase
Solution Approach 1:
The recess structure merges multiple joint-forming functions into a single geometric feature. The angled sides provide both the mechanical interference fit and the bonding agent retention, combining what would traditionally require separate mortise and tenon operations into one integrated structure.
Solution Approach 2:
The recess geometry uses specific angular parameters of its sides to create the interference fit effect. By changing the angle parameters of the recess sides, the structure achieves both mechanical strength and bonding retention in a single operation, simplifying the manufacturing process.
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
This method reduces the need for clamping devices, minimizes labor and inventory costs, and enhances productivity by providing a secure interference fit for bonding agents to cure without damaging materials.
Implementation Method 1
at least one side wall having a serrated cross-sectional configuration with inwardly projecting, distortable segments; providing a portion of the other of such workpieces insertable into the recess of the first workpiece, having a cross-sectional configuration sufficient to engage and distort the inwardly projecting, distortable components of the first member
Implementation Method 2
inserting the projecting portion of the other workpiece into such recess causing such segments to distort and thus provide an interference fit between such workpieces
Data Source
AI summary
A method of forming a joint between first and second workpieces generally consisting of forming a recess in one of such workpieces, provided with at least one side wall having a serrated cross-sectional configuration with inwardly projecting, distortable segments; providing a portion in the other of such workpieces, insertable into such recess, having a cross-sectional configuration sufficient to engage and distort such segments as such portion is inserted into such recess; and inserting such of the other workpiece into such recess, causing the segments to distort and thus provide an interference fit between such workpieces.