Fenestration Corner Key Overlap Structure for Coastal Impact Resistance
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Solution Overview
Problem
Modern fenestrations struggle to balance coastal impact resistance with aesthetic appeal and energy efficiency, as engineering for high wind loads often compromises these aspects.
Innovation Solution
The use of reinforcement members overlapping support arms of corner keys in fenestration units, combined with thermoplastic resin composites and hollow lineal extrusions, to enhance impact resistance while maintaining energy efficiency and aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reinforcement members and corner keys are added to achieve coastal impact resistance, then impact resistance is improved, but device complexity increases
Solution Approach 1:
The reinforcement member is integrated with the corner key assembly, where the reinforcement member's first end overlaps with the support arm of the corner key. This merging of components allows the reinforcement structure to be incorporated into the existing corner key design, providing impact resistance while minimizing additional complexity and the number of separate parts.
Solution Approach 2:
The reinforcement member is positioned within the stile assembly, nesting the reinforcement function within the existing structural framework. The overlap geometry allows the reinforcement member to be contained within or adjacent to the corner key components, creating a compact nested structure that enhances strength without proportionally increasing overall device complexity.
2Strength
If metal reinforcement is used to meet impact resistance requirements, then strength is improved, but weight increases
Solution Approach 1:
The reinforcement member utilizes overlap geometry where the first end overlaps a portion of the support arm, creating a distributed reinforcement pattern rather than requiring heavy metal concentrations. This parameter-based design approach optimizes the reinforcement distribution to achieve necessary strength while minimizing material usage and associated weight.
Solution Approach 2:
The reinforcement member can be constructed from composite materials that combine structural strength with reduced weight compared to traditional solid metal reinforcement. The overlap configuration works effectively with composite materials to provide the necessary impact resistance while maintaining lower weight, aligning with the goal of minimizing metal usage.
3Reliability
If corner keys with support arms are used to provide structural support, then impact resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The corner key assembly is segmented into distinct functional components: the corner key body with its support arm, and the separate reinforcement member. This segmentation allows each component to be manufactured independently using optimized processes, then assembled together through the overlap connection, simplifying the overall manufacturing complexity compared to a monolithic structure.
Solution Approach 2:
The reinforcement member is pre-configured with its overlapping end geometry before assembly with the corner key. This preliminary preparation of the overlap interface allows for simplified assembly operations, where the reinforcement member is positioned and secured relative to the corner key without requiring complex alignment or multi-step manufacturing processes.
Data Source
AI summary
Embodiments herein relate to fenestrations, such as windows and doors, exhibiting coastal impact performance. In a first aspect, an impact-resistant fenestration unit can be included having a frame assembly including a sill, a head jamb, and two opposed side jambs. A bottom sash can be included having a bottom rail, a check rail, and two opposed stiles. A first corner key can be configured to engage the bottom sash at a first lower corner. The first corner key can include a support arm extending in a first direction onto or into a first stile of the two opposed stiles. A first reinforcement member disposed on or within the first stile. The first reinforcement member can include a first end and a second end. The first end can overlap a portion of the support arm of the first corner key. Other embodiments are also included herein.