Interlocking Wood Framing Joints Eliminate Mechanical Fasteners
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional light wood framing techniques require onsite cutting and mechanical fasteners, increasing construction costs and safety risks due to the need for skilled labor, heavy lifting, and the use of tools like hammers and nail guns.
Innovation Solution
A building framing system that uses pre-cut components with specific connection geometries, such as mortise and tenon joints, allowing adjacent components to connect without mechanical fasteners, reducing the need for onsite cutting and tooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional light wood framing techniques are used with mechanical fasteners and onsite cutting, then structural connection strength is achieved, but construction cost increases and safety risks arise due to need for skilled labor and tools
Solution Approach 1:
The patent removes mechanical fasteners (nails, screws, connectors) from the framing system entirely. Instead, structural strength is achieved through precisely engineered geometric interlocking features—mortise and tenon joints, dovetail connections, and complementary shaping of lumber components that lock together through friction and geometric constraint alone, eliminating the need for metal fasteners and their associated installation tools
Solution Approach 2:
The patent replaces the mechanical fastening system (nails, screws, connectors, hammers, nail guns) with a geometry-based interlocking system. The structural connection is achieved through the shape and fit of the wood components themselves—precision-cut mortise and tenon joints, dovetail connections, and complementary surfaces that create friction-based and geometric locks without any metal fasteners or power tools
2Adaptability or versatility
If dimensional lumber is cut onsite to needed sizes, then adaptability to specific building dimensions is achieved, but skilled labor requirements and construction time increase
Solution Approach 1:
The patent specifies predetermined standard lengths and dimensions for all framing components (e.g., wall plates 8-12 inches, joists 16-24 inches on center, rafters with specific overhangs). These standardized dimensions are built into the design from the outset, allowing components to be pre-cut at the mill and assembled without onsite measuring and cutting, thereby eliminating the need for skilled carpenters while maintaining adaptability through modular design
Solution Approach 2:
The patent establishes specific dimensional parameters for all framing elements—standardized lengths, widths, thicknesses, and spacing intervals (e.g., 16 or 24 inches on center). By fixing these parameters in the design specification, the system achieves adaptability through modular repetition of standardized components rather than custom cutting, dramatically reducing construction time and skill requirements
3Stability of the object's composition
If heavy wall sections are lifted into place and braced, then structural assembly is achieved, but safety risks and equipment requirements increase
Solution Approach 1:
The patent divides the building into modular sections (walls, floors, roofs) that can be assembled incrementally. Each section is constructed with interlocking joints that provide inherent stability as assembly progresses, allowing workers to build upward in manageable units rather than lifting and positioning entire heavy wall sections, thereby reducing the need for cranes and heavy equipment while maintaining structural integrity
4Strength
If large roof trusses are set in place by machine lift, then roof structural integrity is achieved, but equipment cost and site safety requirements increase
Solution Approach 1:
The patent divides the roof structure into smaller, manageable components (individual rafters, ceiling joists, and purlins) that can be assembled in place using simple hand tools. These components are connected through standardized geometric joints that provide structural integrity without requiring large pre-assembled trusses to be crane-lifted into position, thereby eliminating the need for expensive lifting equipment and complex site setup
Data Source
AI summary
A building framing system includes a floor portion or floor framing system, a wall portion or wall framing system, and a roof portion or roof framing system. Each framing system comprises a plurality of components. Each component defines a connection geometry for connecting one component to another. The connection geometries are such that mechanical or other similar fasteners are not required to hold the various components together; rather, the connection geometries connect the components and hold them in place with respect to one another. Further, the framing systems utilize pre-cut components such that the components of each framing system arrive onsite cut to a needed length and width and with the appropriate connection geometry.