Static Air Dam Structure for Window Jamb Air Sealing
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Solution Overview
Problem
Window jamb channels allow excessive air flow and particle entry, compromising insulation and increasing the force needed to move window sashes due to inadequate sealing, and existing solutions to meet high wind standards often introduce unwanted resistance.
Innovation Solution
A static air dam with mounting features, reinforcing elements, and flexible projections is designed to fit within the jamb channel, inhibiting air flow and securing the curl spring balance, while providing structural support and minimizing particle entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the jamb channel is left open to allow sash movement, then the sash can traverse freely up and down, but excessive air flow and particle entry occur, compromising insulation
Solution Approach 1:
The jamb channel is segmented into two functional zones: an upper sealed portion containing the air dam that blocks air and particles, and a lower open portion that allows sash movement. This segmentation allows the channel to simultaneously prevent harmful air flow while maintaining operational freedom for the sash.
Solution Approach 2:
The air dam acts as an intermediary element within the jamb channel that selectively blocks air and particle flow while permitting sash movement. It serves as a mediator between the conflicting requirements of sealing and operational freedom, using its specific geometry and positioning to achieve both goals.
2Object-affected harmful factors
If conventional sealing methods are used to block air flow, then air passage is reduced, but resistance is added to sash movement
Solution Approach 1:
The air dam is designed with localized sealing features only where needed to block air and particles, while maintaining open spaces and clearances in areas where sash movement occurs. This local quality approach ensures effective air blocking without creating friction or resistance against the moving sash.
Solution Approach 2:
The air dam incorporates flexible elements and clearances that adapt dynamically to sash movement. The structure allows the sash to pass through freely while maintaining its air-blocking function, effectively making the seal dynamic rather than static to avoid resistance during operation.
3Object-affected harmful factors
If the air dam is made large to block air flow, then air passage is inhibited, but the structure becomes complex and adds resistance
Solution Approach 1:
The air dam extracts only the essential air-blocking function from the jamb channel without requiring a complete seal. By removing unnecessary structural elements and focusing on minimal effective blocking, the design achieves air flow inhibition with a simple, low-complexity structure that does not interfere with sash movement.
Solution Approach 2:
The air dam implements partial blocking action rather than complete sealing, which is sufficient to inhibit harmful air and particle flow while maintaining simplicity. This partial action approach avoids the complexity of a full seal while achieving the necessary air flow reduction.
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 static air dam effectively reduces air flow and particle entry, maintaining window operation efficiency and structural integrity under high wind conditions without adding resistance.
Implementation Method 1
Air passage through the jamb channel is prohibited or at least substantially inhibited by the static air dam
Implementation Method 2
The air dam preferably includes a pair of flexible projections for engaging ears on the curl spring carrier
Implementation Method 3
The air dam includes integrally formed reinforcing elements that either abut or are adjacent to the side walls of the jamb channel
Data Source
AI summary
The static air dam includes at least one mounting feature, which is preferably at least one hole or slot to allow a fastener, such as a screw, bolt, rivet, weld, or other similar attachment devices, to secure the air dam to a wall of a jamb channel. Air passage through the jamb channel is prohibited or at least substantially inhibited by the static air dam that is designed to approximate the size and dimensions of the cross section of the jamb channel. At least one side of the air dam includes a tab or similar structure for securing the free end of the curl spring of a curl spring balance. The air dam includes integrally formed reinforcing elements that either abut or are adjacent to the side walls of the jamb channel. The air dam preferably includes a pair of flexible projections for engaging ears on the curl spring carrier.