3D Bed Frame Wedge Joint for Tool-Free Rigid Assembly
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Solution Overview
Problem
Conventional bed frames require tools for assembly, are prone to connection weaknesses due to metal edges concentrating force, and can be expensive and difficult to work with, leading to potential collapse and squeaking issues.
Innovation Solution
A tool-less interlock system using a wedge and receiver design with three-dimensional contact, made from plastic, which distributes stress and provides stability by translating downward pressure into outward forces, constraining them with a continuous surface contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional metal components with interfitting connections are used, then the bed frame can be assembled at the site, but tools are required for assembly and the connections become unreliable over time
Solution Approach 1:
The connection system is divided into separate wedge and receiver components that can be independently manufactured and assembled. The wedge is inserted into the receiver to create a secure mechanical connection, allowing tool-free assembly while maintaining connection reliability through the interlocking geometry of the segmented parts.
Solution Approach 2:
The connection transitions from conventional two-dimensional planar connections to a three-dimensional volumetric interlock. The wedge-shaped component creates depth and volume in the connection, with the wedge fitting into a recessed receiver to form a multi-dimensional mechanical lock that resists loosening and provides reliable long-term connection.
2Strength
If steel components are used for connections, then the bed frame structure is strong, but the material is expensive and difficult to work with
Solution Approach 1:
The connection geometry is optimized with specific wedge angles and receiver dimensions that maximize mechanical interlocking strength. The wedge angle and receiver cavity dimensions are carefully parameterized to distribute loads effectively, achieving strong connections while allowing for easier manufacturing compared to traditional steel fasteners.
Solution Approach 2:
The connection system uses composite construction combining the wedge and receiver as integrated components that work together. The design may incorporate different materials or material treatments in the wedge and receiver portions to optimize both strength and manufacturability, replacing homogeneous steel construction with a more versatile composite approach.
3Ease of operation
If sheet metal plates are used for interlocking, then the bed frame can be assembled without tools, but the edges concentrate force and connections become unreliable
Solution Approach 1:
The connection evolves from two-dimensional sheet metal contact to three-dimensional volumetric interlocking. The wedge component introduces depth and volume to the connection, creating a multi-dimensional mechanical lock that distributes forces throughout the volume of the receiver cavity rather than concentrating them at edges, thereby maintaining tool-less assembly while significantly improving connection strength.
Solution Approach 2:
The design converts the potential harm of edge concentration into beneficial force distribution. By using a wedge shape inserted into a receiver, the forces that would normally concentrate at sharp edges are instead distributed throughout the volumetric interface between the wedge and receiver surfaces, transforming a weakness into a strength through geometric design.
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 system securely locks the bed frame components together without tools, resisting bending, swaying, and twisting forces, ensuring a rock-solid connection and preventing looseness, thus enhancing the structural integrity and reducing assembly complexity.
Implementation Method 1
employing a wedge on one of the components and a receiver on the other of the components such that there is a three dimensional contact of the wedge into the receiver
Data Source
AI summary
A connection system for use in joining structural members of a bed frame together. One of the structural members has a wedge and the other of the structural members has a cavity formed in a receiver. The wedge has a plurality of exterior surfaces that contact with a plurality of interior surfaces formed in the cavity. There may be four interior and exterior surfaces of the wedge and receiver and at least two of the surfaces taper inwardly in the downward direction. The interfitting of the wedge into the receiver make a solid connection that is enhanced by weight of the bedding positioned thereon. The connection resists twisting forces as well as lateral and fore and aft forces.