Outdoor Tabletop Frame Structure to Prevent Warping
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Solution Overview
Problem
Outdoor tabletops made of plastic or composite materials face issues with warping and bending due to temperature changes, leading to loose decorative stone components and structural instability, especially in larger sizes.
Innovation Solution
A tabletop system featuring a decorative top layer with a horizontal mesh sublayer and binder system, combined with a rigid frame system using C-channels and retaining tabs, to provide enhanced adhesion and structural integrity, using binders like unsaturated polyester resin or epoxy resin to fill gaps and adhere the stone and metal components securely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If plastic materials are used for outdoor tabletops, then weight is reduced and resistance to harsh environmental conditions is improved, but sufficient supporting strength and rigidity cannot be achieved without additional structure
Solution Approach 1:
The patent uses a composite structure combining plastic tabletop material with a metal frame (aluminum, steel, or iron) to achieve both light weight and sufficient strength. The metal frame provides the structural support while the plastic top maintains environmental resistance and portability.
Solution Approach 2:
The tabletop is divided into separate components: a plastic top layer and a metal frame structure. This segmentation allows each material to perform its optimal function - plastic for weather resistance and the metal frame for structural integrity.
2Strength
If metal base plates are used to provide sufficient strength, then warping and bending are prevented, but the tabletop becomes too heavy for portable tables
Solution Approach 1:
Instead of using a solid metal base plate, the patent employs a metal frame structure with vertical and transverse members that provide the necessary anti-warping strength with significantly reduced weight compared to a solid plate.
Solution Approach 2:
The patent uses thin metal frame members (vertical and transverse) that provide structural support through their geometry and arrangement rather than through mass, achieving strength with minimal weight.
3Shape
If cement board with magnesium silicate plate is used as base plate, then the tabletop remains reasonably flat for smaller sizes, but the table warps in extreme temperatures when used in larger tables
Solution Approach 1:
The patent changes the material parameters by using metal frame members with specific thermal expansion properties that are more suitable for large tables in extreme temperatures compared to cement board with resin binders.
Solution Approach 2:
The metal frame structure uses materials (aluminum, steel, iron) that maintain dimensional stability and resist warping in extreme temperatures better than cement board with organic resin binders, especially for large table sizes.
4Strength
If metal plate is used to provide strength and resist bending, then structural integrity is improved, but significant weight is added and adhesion with resin is poor causing separation
Solution Approach 1:
Instead of using a single large metal plate, the patent segments the metal support into vertical members and transverse members that work together to provide bending resistance with reduced total weight.
Solution Approach 2:
The patent uses thin metal frame members that provide structural support through their arrangement and geometry rather than through material mass, achieving strength with minimal weight addition.
5Ease of manufacture
If polyester resin is used as binder, then cost is reduced, but the binder expands and contracts significantly with temperature changes causing warping and cracking
Solution Approach 1:
The patent changes the binder material parameters by using epoxy resin or vinyl ester resin instead of polyester resin, achieving better dimensional stability and reduced thermal expansion/contraction while maintaining cost-effectiveness.
Solution Approach 2:
The patent selects resin materials with phase transition characteristics (thermal expansion coefficients) that better match the metal frame and decorative elements, reducing differential expansion and preventing warping and cracking.
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 system effectively prevents warping and cracking, ensuring the decorative stone components remain securely attached and the tabletop maintains structural integrity across temperature variations, even in larger sizes.
Implementation Method 1
A first horizontal sublayer of binder is disposed under and in contact with the first horizontal mesh sublayer... a second horizontal sublayer of binder may be disposed under and in contact with the horizontal felt sublayer
Implementation Method 2
The tabletop made of such material remains reasonably flat, but only for smaller size tables... If the base plate, being adhered to the resin, is flexible, then it will tend to bend with resin and warp the table. This is because the resin included as a binder or media to adhere the support plate to a decorative stone layer can expand when the temperature increases and contract when the temperature drops.
Data Source
AI summary
A tabletop system having a metal frame with at least one horizontally oriented transverse member and a rim member defining a general shape of a tabletop. At least one fiber mesh layer, fabric felt and at least one layer of adhesive binder is affixed to the underside of spaced apart decorative elements. Vertical rim elements envelope the perimeter providing the outer surface of the tabletop. The metal frame has at least one C-channel with retention tabs defining an opening into a base cavity. The base cavity and opening are filled with adhesive binder material and cured before placing the frame assembly into the binder layer of the decorative elements where the rim of the frame member is smaller than the perimeter of the vertical element which is then interposed with a mesh strip and binder. The retention tabs mechanically secure the tabletop to the frame system.