Angled Sill Cleat Anchoring Fenestration Wind Loads
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Solution Overview
Problem
Fenestration systems face challenges in withstanding wind loads and maintaining stability due to inadequate anchoring, leading to potential movement and instability.
Innovation Solution
The use of sill cleats with angled surfaces that engage edge projections of the sill assembly, providing secure anchoring by extending through a gap between projections and limiting movement in both directions, while being easily installable and adaptable to various materials and configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional anchoring methods are used for fenestration systems, then installation is simpler, but the system cannot withstand wind loads and maintains stability
Solution Approach 1:
The anchoring system is divided into multiple sill cleats distributed along the sill assembly, with each cleat providing localized anchoring. The sill cleat itself is segmented into distinct functional portions: a first portion engaging the first edge projection, a second portion engaging the second edge projection, and an intermediate portion extending through the gap. This segmentation allows the complex anchoring function to be distributed across multiple simple components.
Solution Approach 2:
The sill cleat is designed to be nested within the cavity formed by the edge projections of the sill assembly. The intermediate portion of the sill cleat extends through the gap between the first and second edge projections, allowing the cleat to be positioned and secured within the existing structure. This nesting approach integrates the anchoring component into the fenestration system without adding external complexity.
2Stability of the object's composition
If rigid anchoring is used to withstand wind loads, then stability improves, but the system cannot accommodate thermal expansion and contraction
Solution Approach 1:
The sill cleat employs angled surfaces (first and second angled surfaces) that provide dynamic engagement with the edge projections. These angled surfaces allow the cleat to maintain contact and provide anchoring force while accommodating movement of the sill assembly due to thermal expansion and contraction. The geometry of the angled surfaces enables the system to adapt to dimensional changes while maintaining stability.
Solution Approach 2:
The engagement between the sill cleat and edge projections is designed to change parameters of the connection based on movement. The angled surfaces transform linear thermal expansion/contraction into angular adjustments in the engagement, allowing the system to maintain stable anchoring while accommodating dimensional changes in the sill assembly.
3Strength
If the sill cleat extends fully through the gap, then anchoring strength increases, but installation becomes more difficult
Solution Approach 1:
The sill cleat extends at least part way through the gap between the edge projections, providing sufficient anchoring strength without requiring complete extension through the entire cavity. This partial extension achieves the necessary mechanical interlocking and force distribution to withstand wind loads while simplifying the installation process and allowing for tolerance accommodation.
Data Source
AI summary
Embodiments herein relate to sill cleats for fenestration systems. In an embodiment, a fenestration system is included having a frame assembly including a sill with a bottom side. The bottom side can include a first edge projection, a second edge projection, and can define a cavity. The system can also include a sill cleat with a first angled surface configured to engage the first edge projection upon movement of the sill in a first direction. The sill cleat can also include a second angled surface disposed on an opposite side of the sill cleat from the first angled surface configured to engage the second edge projection upon movement of the sill in a second direction. Other embodiments are also included herein.