Sill Corner Brackets for Coastal Impact Fenestrations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Modern fenestrations, such as windows and doors, face a design constraint in achieving both high wind resistance and aesthetic appeal, as well as energy efficiency, due to stringent coastal building codes, often resulting in compromised performance in insulation and energy efficiency.
Innovation Solution
The development of an impact-resistant fenestration unit with a frame assembly that includes a sill, head jamb, and side jambs, featuring a movable bottom sash with a bottom rail that defines a channel for corner brackets, which are anchored using fasteners penetrating through the frame, and constructed from thermoplastic resin materials to enhance durability and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fenestrations are designed to meet coastal building code requirements for high wind loads and impact resistance, then impact resistance is improved, but aesthetics and energy efficiency are worsened
Solution Approach 1:
The corner brackets are nested within channels defined in the bottom rail of the bottom sash, allowing the reinforcement structure to be hidden from external view while maintaining impact resistance. This nesting approach resolves the contradiction by embedding the functional element (bracket) within another element (channel) to eliminate aesthetic compromise.
Solution Approach 2:
The corner brackets extend partway along the side jambs into a third dimension, providing structural reinforcement beyond the corner region. This dimensional extension allows the brackets to engage with deeper structural elements while remaining largely concealed, thus maintaining both aesthetics and impact resistance.
2Reliability
If fenestrations are designed to meet coastal building code requirements for high wind loads and impact resistance, then impact resistance is improved, but insulation and energy efficiency are worsened
Solution Approach 1:
The corner brackets and frame components are constructed from composite materials including thermoplastic resins and reinforced polymers that provide both high impact resistance and thermal insulation properties. This composite material approach resolves the contradiction by selecting materials that simultaneously deliver structural performance and energy efficiency.
3Reliability
If corner brackets extend partway along side jambs and are anchored with fasteners penetrating through the frame, then impact resistance is improved, but device complexity increases
Solution Approach 1:
The corner brackets are segmented into distinct functional zones: a corner reinforcement portion, extension portions along the side jambs, and mounting portions with fastener holes. This segmentation allows each zone to perform its specific function optimally while simplifying the overall design and assembly process.
Solution Approach 2:
The corner brackets are pre-configured with channels and fastener holes during manufacturing, allowing for simplified on-site installation. The preliminary preparation of mounting features resolves the complexity contradiction by moving design complexity to the manufacturing stage rather than the installation stage.
Data Source
AI summary
Embodiments herein relate to fenestrations exhibiting coastal impact performance. In an embodiment, a fenestration unit includes a frame assembly forming a first lower corner and a second lower corner. A first sill corner bracket can fit on a top of a sill and extend from the first lower corner partway along the top of the sill and partway along one side jamb of the frame assembly. A second sill corner bracket can be configured to fit on the top of the sill and extend from the second lower corner partway along the top of the sill and partway along the other side jamb. A bottom sash can include a bottom rail defining a channel to receive at least a portion of the first corner bracket and the second corner bracket therein when the bottom sash is in the closed position. Other embodiments are also included herein.