Cabinet Mortise-Tenon Assembly Using Notched Orientation Cues
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Solution Overview
Problem
The existing methods for assembling kitchen cabinets from wood-based sheet materials, such as plywood or MDF, are inefficient due to the lack of clear orientation and sequence guidance for mortise and tenon connections, leading to incorrect assembly and reduced productivity.
Innovation Solution
The method involves providing identifying marks on the surfaces of mortises and tenons to ensure proper orientation and sequence of assembly, using machined notches to indicate the correct mating and fitting order of components, which are then assembled manually.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If blind dado joints are used to join cabinet parts, then the joint is not visible when assembled and allows two orientations, but it becomes difficult to determine the correct orientation especially for internal joints such as shelves or partitions
Solution Approach 1:
The patent applies visual indicators (different shading patterns) to mark the correct orientation of workpieces. The first workpiece has a first shading pattern on its surface, while the second workpiece has a second shading pattern, allowing assemblers to easily identify the correct orientation during assembly without visible external markings on the finished product.
Solution Approach 2:
The workpieces themselves carry the orientation information through their shading patterns and identifying marks. The assembly instructions reference these marks directly on the workpieces, making the system self-explanatory and eliminating the need for external references or complex assembly documentation.
2Loss of information
If assembly drawings and part labels are provided to guide the assembly process, then information about component relationships and sequence is available, but substantial time and mental effort are required to understand and locate each part
Solution Approach 1:
The patent pre-marks the workpieces with identifying marks and shading patterns during the manufacturing process. This preliminary action ensures that when the workpieces arrive at the assembly stage, all necessary orientation and identification information is already embedded on the parts themselves, eliminating the need for assemblers to cross-reference drawings and labels during assembly.
Solution Approach 2:
The patent extracts the essential assembly guidance information (orientation marks, identifying marks) directly from the assembly drawings and embeds it onto the workpieces themselves. This removes the need for assemblers to consult external documentation, as the critical information is now directly available on the parts being assembled.
Data Source
AI summary
A method of forming an assembly including a first workpiece having a surface provided with a mortise and a second workpiece provided with a tenon inserted into the mortise joining the workpieces together in which the second workpiece is disposed in a certain orientation relative to the first workpiece to provide a certain disposition of the workpieces when joined together, generally consisting of providing identifying marks on the surface of the first workpiece and the tenon of the second workpiece at locations assuming a certain disposition when the second workpiece is disposed in a certain orientation and the tenon is registered with the mortise; positioning the second workpiece relative to the first workpiece wherein the second workpiece is disposed in the certain orientation relative to the first workpiece, the tenon is registered with the mortise and the marks are disposed in the certain mark disposition; and displacing the second workpiece toward the first workpiece and inserting the tenon into the mortise.