Mull End Connector Bonding for Secure Compound Fenestration Joints
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Solution Overview
Problem
Existing compound fenestration assemblies lack secure attachment to building openings, leading to potential integrity issues under wind loads and other forces, especially when multiple fenestration units are joined, and require complex installation processes.
Innovation Solution
Incorporating mull end connectors that attach to both fenestration units and building openings using a flowable bonding agent, allowing for adjustable positioning and secure fixation without visible fasteners, enhancing structural integrity and simplifying installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mull joints are not attached to the building opening, then the installation process is simpler, but the structural integrity and load transfer capability deteriorates under wind loads
Solution Approach 1:
The patent replaces traditional mechanical attachment systems (screws, bolts, clips) with a flowable bonding agent that chemically bonds the mull joint to the building opening. This substitution eliminates the need for complex mechanical fastening while providing superior structural integrity and load transfer capability, resolving the contradiction between ease of installation and structural strength.
Solution Approach 2:
The patent utilizes the flowable state of the bonding agent during installation (low viscosity for easy application) that transitions to a rigid bonded state after curing (high strength for load transfer). This parameter change allows the same material to provide both ease of installation and structural integrity at different stages of the process.
2Strength
If traditional fastening methods are used to attach mull joints, then structural integrity is maintained, but visible fasteners compromise the aesthetic appearance
Solution Approach 1:
The bonding agent completely replaces mechanical fastening systems, eliminating visible screws, bolts, or clips that would compromise aesthetics. The chemical bond provides equivalent or superior attachment strength while maintaining a clean, uninterrupted appearance of the fenestration assembly.
Solution Approach 2:
The bonding agent serves as an intermediary substance that transfers loads between the mull joint and building opening without requiring visible mechanical connectors. This intermediary material bonds the components together internally, keeping all fastening elements hidden within the joint structure.
3Adaptability or versatility
If mull end connectors are made adjustable for positioning, then installation flexibility is improved, but device complexity increases
Solution Approach 1:
The mull end connectors incorporate adjustable positioning mechanisms that allow the connectors to be moved along the mull joint to various positions before being permanently bonded. This dynamic adjustability during installation provides flexibility to accommodate different opening dimensions and alignment requirements, while the final bonded state provides structural rigidity.
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 enhanced structural integrity and simplified installation by ensuring all mull joint ends are securely attached to the building opening, improving load transfer and maintaining assembly integrity under various forces while maintaining a clean, unobstructed appearance.
Implementation Method 1
The mull end connectors described herein are configured to be attached to the building opening using a flowable bonding agent
Data Source
AI summary
Compound fenestration assembly mull joints including one or more mull end connectors, compound fenestration assemblies using those mull joints, and methods of making and using the same are described herein. The compound fenestration assembly mull joints including one or more mull end connectors described herein are configured to be attached to the building opening using a flowable bonding agent (in addition to attachment of the fenestration units to the building openings).