Adjustable Thermoplastic Threshold Assembly
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Solution Overview
Problem
Conventional entryway threshold assemblies are prone to damage from mechanical stress and UV light, are thermally conductive, and lack adjustability to fit varying door heights and entryway dimensions, leading to inefficiencies in energy management and aesthetics.
Innovation Solution
A modular threshold assembly featuring a base portion with an adjustable cap and deck cover made from thermoplastic materials like PMMA, incorporating features such as coextrusion, impact modifiers, and UV inhibitors, allowing for tool-free installation and repair, and accommodating varying dimensions with a thermal barrier for improved energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional wood or metallic materials are used for threshold assemblies, then the threshold can be manufactured with simple materials, but the threshold becomes susceptible to damage from mechanical stress and ultraviolet light
Solution Approach 1:
The patent employs composite materials consisting of a thermoplastic matrix combined with UV inhibitors and impact modifiers. This composite structure provides both durability against mechanical stress and UV degradation while maintaining manufacturability through standard thermoplastic processing techniques.
Solution Approach 2:
The patent modifies the chemical composition parameters of the threshold material by incorporating specific additives (UV inhibitors, impact modifiers) into the thermoplastic matrix. These parameter changes enhance the material's resistance to environmental degradation without fundamentally altering the manufacturing process.
2Strength
If conventional metallic threshold assemblies are used, then the threshold can be structurally strong, but the threshold becomes thermally conductive and energy inefficient
Solution Approach 1:
The patent changes the thermal parameter of the threshold material by selecting thermoplastic materials with inherently lower thermal conductivity compared to metals. This parameter change maintains structural adequacy while significantly reducing thermal energy transfer across the threshold.
Solution Approach 2:
The patent applies different material properties to different functional regions of the threshold assembly. The thermoplastic material provides thermal insulation where needed while maintaining sufficient structural strength for load-bearing functions.
3Ease of manufacture
If a fixed threshold assembly is used, then the manufacturing process is simple, but the threshold cannot accommodate doors of varying heights or entryways of varying widths
Solution Approach 1:
The patent divides the threshold assembly into separable components including a base portion, a cap portion, and a deck cover. This segmentation allows individual components to be adjusted or replaced independently to accommodate varying door heights and entryway dimensions while maintaining manufacturing simplicity for each component.
Solution Approach 2:
The patent incorporates adjustable elements within the threshold assembly that allow dynamic adaptation to different configurations. The separable and potentially reconfigurable design enables the threshold to adapt to varying architectural requirements without requiring custom manufacturing for each application.
4Device complexity
If a non-modular threshold assembly is used, then the structure is simple, but the threshold is difficult to repair or replace when damaged
Solution Approach 1:
The patent divides the threshold into distinct, separable components (base portion, cap portion, deck cover) that can be independently removed and replaced. This segmentation maintains overall structural simplicity while enabling easy repair of damaged components without replacing the entire assembly.
Solution Approach 2:
The modular design allows damaged portions of the threshold assembly to be discarded and replaced with new components, while intact components can be recovered and reused. This approach simplifies repair processes while maintaining structural integrity.
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 solution provides a durable, aesthetically pleasing, and energy-efficient threshold assembly that is resistant to mechanical and UV damage, easily adjustable, and cost-effective, while preventing condensation and icing, thus enhancing safety and reducing maintenance costs.
Implementation Method 1
thermoplastic materials like PMMA, incorporating features such as coextrusion, impact modifiers, and UV inhibitors
Implementation Method 2
The base top portion can be a graded surface with the height proximal to the attachment groove being a greater than the height near the front face to promote moisture runoff
Implementation Method 3
thermally insulating, aesthetically pleasing, and convenient to repair all while providing the ability to manufacture the threshold in a cost effective manner
Data Source
AI summary
Disclosed is a threshold assembly that is durable and resistant to damage from mechanical stress and ultraviolet light exposure, thermally insulating, aesthetically pleasing, and adjustable to accommodate varying door heights and entryway dimensions and that can also be manufactured in a cost effective manner. The threshold includes base portion having a front face that accommodates an extender, a top surface, a channel, a nose wall, and an optional sizing notch that allows the threshold to be cut to varying entryway widths. The threshold further includes a deck cover secured about the base portion and a cap disposed within the base channel. An adjustment screw is disposed within the cap and used to vary the height of the threshold assembly to create an appropriate fit to an associated door. The deck cover or other components can be made of a durable coextruded material with impact or other modifiers.