Chair Frame Injection Molded Foam Padding Integration
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Solution Overview
Problem
Existing chair designs with injection molded foam do not integrate the foam cushions with the frame, leading to increased manufacturing costs and separate upholstery processes, which can compromise comfort and efficiency.
Innovation Solution
A chair design where the seat and back foam cushions are molded directly onto a partially assembled frame, with the frame pieces being press-fit together, allowing for integrated upholstery and reduced post-molding processing, using molds that accommodate the frame legs to ensure proper alignment and sealing during the molding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If injection molded foam is used to create a seat bottom that attaches separately to a chair, then the seat can be designed with flexible supports and foam cushion, but the manufacturing process becomes more complex and costs increase
Solution Approach 1:
The patent merges the seat bottom foam cushion and backrest foam cushion into a single integrally molded foam assembly. The foam is injection molded directly onto the chair frame, eliminating separate attachment components and simplifying the manufacturing process. The single foam assembly includes both the seat bottom and backrest portions, reducing the number of parts and assembly steps.
Solution Approach 2:
The chair frame is prepared in advance with specific structural features (openings, recesses, mounting surfaces) that accommodate the foam molding process. The frame is assembled before foam injection, allowing the foam to be molded directly onto the completed frame structure, ensuring proper alignment and integration without requiring post-molding adjustments.
2Ease of manufacture
If hard plastic seats are used, then manufacturing costs are reduced, but comfort qualities are compromised
Solution Approach 1:
The patent uses a composite construction combining a rigid chair frame (metal or plastic) with a soft foam cushion material. The foam provides comfort and cushioning qualities that hard plastic cannot achieve, while the rigid frame maintains structural integrity. This composite approach delivers both comfort and cost-effectiveness by using materials that complement each other's properties.
Solution Approach 2:
The patent changes the material parameter of the seat from hard plastic to soft foam, fundamentally altering the comfort characteristics. The foam material provides conformability, cushioning, and comfort while maintaining manufacturing efficiency through injection molding processes that are already well-established in the industry.
3Manufacturing precision
If foam cushions are molded separately and then attached to the frame, then the molding process is simpler, but post-molding processing and assembly time increase
Solution Approach 1:
The foam molding process is merged with the frame assembly process. The foam is injection molded directly onto the assembled frame, combining two operations into one. This eliminates the need for separate attachment steps, aligning operations, and post-molding processing, thereby reducing total manufacturing time while ensuring precise foam-to-frame alignment through the direct molding process.
4Adaptability or versatility
If the frame is made in multiple pieces requiring assembly, then adaptability and transportability are improved, but the number of parts and assembly complexity increase
Solution Approach 1:
The chair frame is segmented into multiple modular pieces (front legs, back legs, crossbars, support structures) that can be independently manufactured, assembled, and configured. This segmentation allows for flexible assembly, easy transport, and adaptability to different configurations while maintaining a manageable number of standardized parts that simplify the overall system.
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 approach reduces manufacturing costs by integrating the upholstery process and minimizing post-molding processing, while enhancing comfort by ensuring the foam cushions are securely attached to the frame, providing a cost-effective and comfortable seating solution.
Implementation Method 1
The backrest support is molded thereover in foam to define a backrest... The seat support is molded thereover in foam to define a seat
Data Source
AI summary
A chair having a first frame portion with a backrest support and a rear leg portion at least part of the backrest support and the leg portion being formed from a single piece. A second frame portion has a seat support and a front leg portion extending in a direction transverse to the seat support, the seat support in a fixed position relative to the backrest support. The backrest support molded thereover in foam, the backrest support being substantially peripherally located around the foam of the backrest and the backrest being provided free from rigid supports extending across a middle portion of the backrest. The seat support molded thereover in foam, the seat support being substantially peripherally located around the foam of the seat and the seat being provided free from rigid supports extending across a middle portion of the seat.