Foam-Core Appliance Panels Without Mechanical Fasteners
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Solution Overview
Problem
Panels and doors for appliances require significant labor time to assemble due to the use of multiple mechanical fasteners, resulting in complex structures with many parts.
Innovation Solution
A panel or door design featuring inner and outer shells bonded together with a cured foam core, which is injected as an uncured or partially-cured liquid into the hollow region between the shells, forming a chemical bond and eliminating the need for mechanical fasteners, while optionally including a translucent or transparent window and a hinge system to secure the assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple mechanical fasteners are used to secure panels together, then structural strength is improved, but assembly time and device complexity increase significantly
Solution Approach 1:
The patent replaces the mechanical fastening system (screws, bolts, clips) with a chemical bonding system using foam adhesive. The foam is injected into the hollow region between panels and cures to form a strong chemical bond, eliminating the need for mechanical fasteners and significantly reducing assembly time while maintaining structural strength
2Strength
If multiple mechanical fasteners and structural ribs are used, then structural rigidity is improved, but panel weight increases
Solution Approach 1:
The patent uses thin panel shells (inner and outer panels) that are bonded together with foam adhesive, eliminating the need for heavy structural ribs and multiple fasteners. The foam core provides structural support while keeping the overall panel weight reduced compared to conventional multi-component constructions
3Reliability
If many parts are used in panel construction, then structural integrity is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent merges multiple separate components (panels, ribs, fasteners) into a simplified construction where inner and outer panels are bonded directly together with foam adhesive. The foam itself serves multiple functions: bonding agent, structural core, and sealant, reducing the total part count while maintaining structural integrity
4Manufacturing precision
If conventional panel construction methods are used, then manufacturing precision is maintained, but productivity decreases due to labor-intensive assembly
Solution Approach 1:
The patent replaces labor-intensive mechanical fastening operations with automated foam injection and curing processes. The foam is injected into the hollow region and cures to bond panels together, enabling faster, more consistent assembly with higher productivity while maintaining manufacturing precision through controlled foam application
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 reduces weight, enhances sound dampening, and provides structural rigidity comparable to conventional methods, with faster assembly times and lower production costs, while being moisture-resistant and requiring fewer parts.
Implementation Method 1
The liquid may form a chemical bond with interior surfaces of the shells to rigidize the finished assembly
Implementation Method 2
The foam core may be injected as an uncured or partially-cured liquid into an interior hollow region defined between the inner and outer shells
Data Source
AI summary
A panel for appliances includes an inner shell and an outer shell that engage one another to define a hollow interior region. An interior divider or intermediate close-out is disposed between the inner and outer shells, and has at least an outwardly-extending portion that extends into the hollow interior region. A foam core is bonded to interior surfaces of the shells and to the divider or close-out. The foam core may be formed or established by injecting an uncured or partially-cured liquid into the hollow interior region. Optionally, the panel is a movable door attached to an appliance, and may include a window portion in a central region thereof.