Slidable Fenestration Unit With Removable Frame Sill
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Solution Overview
Problem
Fenestration units such as windows and glass doors face challenges in assembly and moisture intrusion due to complex frames with multiple pieces and joints, which complicate installation and affect aesthetic appearance.
Innovation Solution
A fenestration unit design featuring a seamless, single-piece frame sill with integrated tracks that allows slidable glass panels, a removable frame sill without disassembling the sill flashing and jambs, and a sill flashing with a base and upward wall to inhibit moisture intrusion, simplifying installation and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the frame is constructed with multiple pieces attached together at joints, then structural strength can be achieved, but the assembly becomes difficult and moisture intrusion increases
Solution Approach 1:
The frame is divided into separate components (header, jambs, sill) that can be assembled together, with the sill being removable without disassembling other components. This segmentation allows for easier assembly and maintenance while maintaining structural integrity through proper connection design.
Solution Approach 2:
The sill is extracted as a separate removable component from the frame assembly. This allows the sill to be independently removed for maintenance or replacement without disassembling the header and jambs, simplifying the overall assembly process and reducing installation time.
2Strength
If the frame includes multiple pieces attached together, then structural strength can be provided, but the aesthetic appearance is affected
Solution Approach 1:
The header, jambs, and sill are designed to connect in a seamless manner that minimizes visible joints. The removable sill design allows for clean connections that improve aesthetic appearance while maintaining the structural benefits of multi-piece construction.
3Ease of manufacture
If the tracks are attached together at joints, then the frame can be assembled, but sealing against moisture intrusion becomes difficult
Solution Approach 1:
The sill is extracted as a separate component with its own integrated flashing system. This allows for dedicated moisture sealing at the sill location without requiring complex sealing at multiple joint locations, improving overall moisture intrusion prevention.
Solution Approach 2:
The sill flashing acts as an intermediary barrier between the sill and the surrounding frame components. This dedicated flashing layer provides specialized moisture protection at the critical sill interface without requiring complex sealing arrangements at other joints.
4Stability of the object's composition
If the frame sill is permanently attached to the frame, then structural integrity is maintained, but maintenance and repairs become difficult
Solution Approach 1:
The sill is segmented as a separate removable component from the frame. This segmentation maintains structural integrity during operation while enabling easy removal for maintenance or replacement without affecting the header and jambs.
Solution Approach 2:
The sill transitions from a static permanent attachment to a dynamic removable connection. This allows the sill to be easily removed for maintenance or replacement while maintaining structural stability during normal operation through proper connection design.
Data Source
AI summary
A fenestration unit includes a first glass unit, a first panel frame, a second glass unit, a second panel frame, a sill flashing, and a frame. The frame includes a header, jambs, and a frame sill including a first track and a second track. The first panel frame and the first glass unit are slidable along the first track when positioned in the frame. The second panel frame and the second glass unit are slidable along the second track when positioned in the frame. The sill flashing includes a base extending under the first and second tracks and a wall extending upward from the base to inhibit moisture intrusion through the fenestration unit. The frame sill is removable from the frame without disassembling the sill flashing, the jambs, and the header.