Chair Component Attachment Using Heated Polymeric Stakes
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Solution Overview
Problem
Existing methods for attaching chair components, such as screws or bolts, are aesthetically unpleasing and costly due to visible fasteners and limited design flexibility, while overmolding requires expensive molds and is only feasible for specific components.
Innovation Solution
A method involving a polymeric back skin and cross member where stakes or projections are heated using infrared energy to bond the components, allowing for flexible attachment without visible fasteners and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screws or bolts are used to attach chair components, then the components are securely fastened, but visible fasteners detract from the aesthetic effect
Solution Approach 1:
The patent removes visible fasteners (screws, bolts, clips) from the exterior of the furniture assembly by embedding attachment mechanisms within recesses or channels of the frame members, thereby eliminating aesthetic deterioration while maintaining secure component attachment
Solution Approach 2:
The patent introduces intermediate structures such as recesses, channels, and receiving portions that mediate between the fastening function and aesthetic requirements, allowing fasteners to be concealed within these intermediate structures rather than exposed on the furniture surface
2Ease of manufacture
If overmolding is used to attach components, then visible fasteners are eliminated, but expensive molds and limited design flexibility are required
Solution Approach 1:
The patent divides the attachment system into separate modular components (frame members with recesses, cross members with protrusions, fasteners) that can be manufactured independently using standard processes, eliminating the need for complex multi-step overmolding while achieving concealed attachment
Solution Approach 2:
The patent employs inexpensive fasteners and standard manufacturing processes rather than expensive custom molds, making the attachment method economically viable for various design iterations and production volumes without the constraints of mold tooling costs
3Strength
If overmolding is used for component attachment, then attachment is achieved, but assembly options are limited and manufacturing costs increase
Solution Approach 1:
The patent creates dynamic assembly capabilities by designing frame members with recesses and cross members with protrusions that can be attached at various stages of furniture assembly, allowing flexible sequencing and reconfiguration without the constraints of overmolding process timing
Solution Approach 2:
The patent develops universal attachment mechanisms (recesses, channels, receiving portions) that can accommodate multiple component types and assembly configurations, enabling the same basic attachment system to be used across different furniture designs and assembly sequences
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 provides design and assembly flexibility, enhances aesthetic appeal by hiding attachments, and reduces manufacturing expenses by enabling component attachment at various steps in the process.
Implementation Method 1
The heating of the projections may be provided by infrared light energy or infrared radiation. The heating of the stakes may also be provided by infrared light energy or infrared radiation.
Data Source
AI summary
A method of attaching furniture components includes providing a first furniture component that may be comprised of polymeric material, positioning a second furniture component adjacent to the first furniture component, positioning stakes attached to the second component through holes formed in the first component, and heating the stakes to bond portions of the second component to portions of the first component. The second component may also be comprised of polymeric material and the stakes may be integral with the second component or formed on the second component. Chairs or other furniture such as office furniture may include components attached together by embodiments of the disclosed method. In some embodiments of the method, a second component may also have projections that are positioned through holes in a third furniture component that may subsequently be heated to bond the third component to the second component.