Knockdown Sofa Assembly Using Friction-Fit Joints Without Fasteners
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Solution Overview
Problem
Existing knockdown furniture is often unsteady due to the lack of structural stability, which is exacerbated by the use of mechanical fasteners that increase complexity, weight, and cost, making it inefficient for assembly, disassembly, and transportation.
Innovation Solution
A knockdown sofa design featuring a base with angled struts and slats that frictionally engage, along with a back section that uses lugs and apertures for secure attachment, eliminating the need for additional hardware and ensuring stability without increasing weight or complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If mechanical fasteners are used to secure furniture components, then structural stability is improved, but device complexity, weight, and cost increase
Solution Approach 1:
The patent removes mechanical fasteners from the furniture assembly system entirely. Instead of using screws, bolts, or other hardware components, the design relies on the inherent friction between precisely fitted wooden joints and the interlocking geometry of tapered pins and mortises to provide structural stability without additional fastening mechanisms.
Solution Approach 2:
The furniture joints are designed to be self-securing through friction and geometric interlocking. The tapered pins automatically wedge tighter upon assembly, and the friction-fit joints maintain their connection through the natural friction between mating surfaces, eliminating the need for separate fastening actions or additional hardware.
2Stability of the object's composition
If mechanical fasteners are used to secure furniture components, then structural stability is improved, but weight increases
Solution Approach 1:
The patent eliminates mechanical fasteners from the furniture construction, removing their weight contribution entirely. The structural stability is achieved through the weight and density of the wood itself, distributed through carefully designed joint geometries that leverage the material's natural properties rather than adding metal fastening components.
3Stability of the object's composition
If mechanical fasteners are used to secure furniture components, then structural stability is improved, but manufacturing cost increases
Solution Approach 1:
The patent removes mechanical fasteners and their associated assembly hardware from the furniture system, eliminating the need to source, inventory, and install multiple types of fastening components. This simplifies the bill of materials and reduces manufacturing complexity.
Solution Approach 2:
The structural and joining functions are merged into the wooden components themselves. The furniture pieces are designed so that the structural members double as joining elements, with integrated joint geometries that eliminate the need for separate fasteners, reducing part count and manufacturing steps.
4Ease of operation
If furniture is designed for knockdown assembly, then ease of assembly and disassembly is improved, but structural stability deteriorates
Solution Approach 1:
The knockdown furniture is designed with self-securing joints that automatically achieve full structural stability upon assembly without requiring additional fastening actions. The friction-fit and tapered joint mechanisms self-tighten and self-lock, providing permanent-strength connections that are as stable as traditional fixed furniture while maintaining easy assembly and disassembly capabilities.
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 design provides a lightweight, structurally stable sofa that is easy to assemble and disassemble, reducing transportation costs and logistical challenges while maintaining stability and style.
Implementation Method 1
The angled slats are attached such that there is a void defined closer to the centerline of the side arm than the slat, permitting the corresponding strut to slide behind the slat and frictionally engage the opposingly oriented angle
Implementation Method 2
the lug is inserted into the aperture, forming a tight frictional engagement with the base
Data Source
AI summary
A knockdown sofa that includes a pair of angled struts affixed at opposing sides to a wooden base and configured to engage different ones of a pair of angled slats, each of the slats attached to different ones of a pair of side arms. The base also defines a pair of apertures configured to receive different ones of a pair of downwardly depending lugs affixed to the bottom of a sofa back, such that the entire sofa can be assembled quickly and easily without the need of tools. An embodiment of the sofa includes hook and loop strips connecting both the side arms and the back to the base.