Inflatable Spa Cover with Drop Stitch Bladders
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Solution Overview
Problem
Conventional spa covers are heavy, costly to transport, and lose insulative properties over time due to waterlogged foam cores, necessitating frequent replacements.
Innovation Solution
A spa cover design featuring inflatable bladders with a drop stitch construction and a slipcover with flexible hinges, allowing for folding and inflation, mimicking the appearance and functionality of foam-core covers but with significantly reduced weight and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional foam-core spa covers are used, then insulative properties and structural support are achieved, but weight becomes excessive and handling difficulty increases
Solution Approach 1:
The patent uses inflatable bladders filled with air or other gases to provide structural support and insulation. The bladders are inflated to a predetermined pressure to achieve the required rigidity and load-bearing capacity, replacing the heavy foam core while maintaining structural integrity. This pneumatic approach allows the cover to be lightweight when deflated for transport but strong when inflated for use.
Solution Approach 2:
The spa cover transitions between static (inflated) and dynamic (deflated) states. When deflated, the cover is lightweight and easy to transport; when inflated, it achieves the necessary structural support and insulation properties. This dynamic transformation resolves the contradiction between weight and strength by allowing the cover to adapt its physical state based on operational requirements.
2Loss of energy
If thick dense foam is used for insulation, then insulative properties improve, but weight and shipping costs increase
Solution Approach 1:
The inflatable bladders utilize trapped air or gas within the bladder structure to provide thermal insulation. Air is a poor conductor of heat, providing effective insulation without the weight penalty of dense foam materials. The bladder walls and internal structure create thermal barriers that prevent heat loss while keeping the overall cover weight minimal.
Solution Approach 2:
The patent changes the physical state and composition of the insulating medium from solid foam to gaseous air trapped within the bladder structure. This parameter change allows the insulation to be highly effective while dramatically reducing weight, as gas density is much lower than foam density.
3Strength
If foam core is used for structural support, then load-bearing capacity is achieved, but water absorption occurs over time reducing insulative properties
Solution Approach 1:
The inflatable bladder structure provides load-bearing capacity through pneumatic pressure rather than through water-absorbing foam materials. The bladder walls and internal pressure distribution enable the cover to support snow loads and other weights without absorbing moisture, thereby maintaining insulative properties and reliability over time.
Solution Approach 2:
The patent extracts the foam core material from the design entirely, replacing it with an inflatable bladder system. This extraction eliminates the water absorption problem inherent in foam materials while maintaining the necessary structural support functions through the pneumatic bladder structure.
4Stability of the object's composition
If rigid foam core is used, then structural stability is achieved, but flexibility for folding and user entry is reduced
Solution Approach 1:
The cover incorporates flexible hinges that allow the bladder structure to be folded or rolled back to provide user access to the spa. The pneumatic bladder maintains structural stability when inflated but can be dynamically repositioned or deflated to enable easy folding and operation, resolving the contradiction between rigidity and flexibility.
Solution Approach 2:
The cover is divided into multiple segments or sections separated by flexible hinges, allowing each section to be independently folded or rolled back. This segmentation enables the cover to maintain structural integrity when closed while providing ease of operation when opening, as individual sections can be maneuvered without compromising overall stability.
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 inflatable spa cover is lighter, easier to transport, maintains insulative properties, and can withstand external loads like snow, reducing shipping costs and the need for frequent replacements.
Implementation Method 1
Each of the first and second bladders made of a drop stitch construction including a top skin, a bottom skin, and a fiber core comprising a plurality of tension fibers extending between the top and bottom skins, the tension fibers structured and spaced between the top and bottom skins to lock the top and bottom skins into a predefined shape when the respective bladder is in a fully inflated state
Implementation Method 2
The slipcover has forms a flexible hinge between at least two separate chambers to permit slipcover with inflatable bladders to be folded back on itself between open and closed configurations
Implementation Method 3
a cover is required to support the body weight of a child without collapsing, when the spa cover is closed over the tub. Also, a spa cover used outdoors should be capable of supporting a snow load
Implementation Method 4
a fiber core comprising a plurality of tension fibers extending between the top and bottom skins, the tension fibers structured and spaced between the top and bottom skins to lock the top and bottom skins into a predefined shape
Data Source
AI summary
A spa cover is described that is comprised of a plurality of inflatable drop stitch bladders and a slipcover comprising a plurality of separate chambers. Each chamber corresponds to a respective one of the plurality of inflatable bladders, and each chamber is constructed to house a corresponding one of the inflatable bladders therein. The slipcover has a hinge between at least two separate chambers.