Vacuum Molded Spa Cover with Bonded Foam Core
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Solution Overview
Problem
Existing spa covers lack improved insulative properties and structural integrity, are costly to produce in various sizes and shapes, and have limited color and design variations due to restrictive molding methods.
Innovation Solution
The method involves vacuum molding acrylic shell halves that are joined to form a hollow cavity, filled with high-density polyurethane foam that bonds with the shells, providing increased strength and rigidity, and allowing for customizable sizes, shapes, and colors through adjustable molds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If internal ribs or columns (kiss offs) are added to provide structural rigidity, then the structural integrity of the cover is improved, but the insulative properties deteriorate due to conductive heat escape paths
Solution Approach 1:
The patent combines foam core material with shell materials to create a composite structure that achieves both structural integrity and thermal insulation. The foam provides rigidity without creating conductive heat paths, while the shell layers provide structural strength and weather resistance.
Solution Approach 2:
The patent uses thin shell members (first and second shells) that are bonded to the foam core, creating a lightweight yet strong structure. These thin shells provide the necessary structural integrity without adding significant thermal conduction pathways.
2Adaptability or versatility
If custom molds are used for different sizes and shapes, then the manufacturing precision and adaptability are improved, but the production cost increases significantly
Solution Approach 1:
The patent divides the cover into modular components (first shell, second shell, and foam core) that can be manufactured separately and assembled. This segmentation allows for easier manufacturing of individual components while maintaining the ability to create various sizes and shapes through configuration changes rather than entirely custom molds.
Solution Approach 2:
The patent creates a universal manufacturing approach where the same basic process and component types can be used across different cover sizes and shapes. The modular design allows a single set of manufacturing capabilities to produce multiple variations, reducing the need for expensive custom tooling for each variant.
3Ease of manufacture
If existing molding methods are used, then the manufacturing process is simple, but the color variation and design flexibility are limited
Solution Approach 1:
The patent uses a composite structure with separate shell and core components, allowing different materials and colors to be combined. The shells can be manufactured in various colors and finishes while the foam core provides structural support, enabling greater design flexibility without complicating the manufacturing process.
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 solution enhances insulative properties, structural integrity, and customization options while reducing production costs, enabling on-demand manufacturing of spa covers with improved thermal efficiency and aesthetic finishes.
Implementation Method 1
vacuum molding a first shell member and a second shell member
Implementation Method 2
disposing a foam within the hollow cavity, wherein the foam is configured to bond with the shell members to create a unitary structural part
Implementation Method 3
These covers help prevent dirt, leaves and other debris from entering the water, and provide a safety function by preventing children and animals from falling into the water. Moreover, spa covers are often insulated so as to limit heat loss from the water
Data Source
AI summary
A method of manufacturing a cover for a spa includes the steps of vacuum molding a first shell member and a second shell member, bringing the first and second shell members into registration with one another to define a hollow cavity therebetween, and injecting a foam into the hollow cavity, wherein the foam is configured to bond with the shell members to create a unitary structural part that provides increased strength and rigidity.