Screen Retention System With Serrated Channel And U-Hem
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing channel-based screen retention systems lack sufficient resistance to impact loading, offer limited tensioning adjustability, and are prone to galvanic corrosion due to contact between dissimilar metals.
Innovation Solution
A screen retention system featuring a frame with serrated channels and deformable locking tabs that secure a screen with a U-shaped edge hem, allowing for adjustable tensioning and electrical isolation from the channel walls, using an elastomeric gasket for sealing and compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If simple fasteners are used to attach the screen directly to the frame, then the system is simple and easy to manufacture, but the screen lacks tensioning capability and appears floppy after repeated use
Solution Approach 1:
The attachment system is segmented into multiple functional components: channel sections framing the opening, screens with U-shaped edge hems, and tensioning mechanisms (screws, rivets, or glue applied to the flange). This segmentation allows each component to perform its specific function while working together to achieve both simplicity and effective tensioning.
Solution Approach 2:
The invention transitions from simple planar attachment to three-dimensional tensioning by creating a channel structure with depth. The U-shaped edge hem and channel walls provide vertical and horizontal constraints, enabling the screen to be tensioned in multiple dimensions rather than just held flat against the frame.
2Ease of manufacture
If the screen is cut slightly too small, then installation is easier, but the screen is weakened and subject to pulling out of the frame because fasteners will be too close to the edge
Solution Approach 1:
The U-shaped edge hem is formed on the screen perimeter before installation, creating a pre-prepared attachment feature that extends the effective attachment area inward from the edge. This preliminary action allows fasteners to be positioned optimally for both strength and appearance, regardless of the screen's final cut dimensions.
3Area of stationary object
If the screen is cut slightly too large, then coverage is improved, but the mesh will be unavoidably floppy because simple fasteners provide no means for tensioning
Solution Approach 1:
The attachment system transitions from a static, fixed-position fastening method to a dynamic tensioning system. The channel structure with its depth and the U-shaped hem allow for adjustment and application of tension forces, enabling the screen to be securely attached regardless of slight size variations while maintaining rigidity.
4Strength
If prior art tensioning provisions are provided in channel-based systems, then some screen tensioning is achieved, but the adjustment range is very limited
Solution Approach 1:
The invention changes the geometric parameters of the channel section, specifically providing substantial depth of clear space inwardly of the serrations and bottom of the main channel. This parameter change creates adequate clearance that allows for a broad range of tensioning adjustments, accommodating different screen sizes and tension requirements.
5Reliability
If metal screen contacts aluminum channel walls, then galvanic corrosion occurs at the interface, but using non-metallic materials reduces structural strength
Solution Approach 1:
The invention introduces an intermediary substance (paint, coating, or other protective layer) between the metal screen and aluminum channel wall. This intermediary layer prevents direct contact between dissimilar metals, eliminating galvanic corrosion while allowing the metal screen to maintain its full structural strength and rigidity.
6Ease of manufacture
If flat or U-shaped screen edges are used in prior systems, then installation is simple, but screen tensioning is very limited and impact resistance is modest
Solution Approach 1:
The invention specifies a U-shaped edge hem with specific geometric characteristics that provide superior performance compared to flat edges. The curved, three-dimensional geometry of the U-shaped hem distributes loads more effectively and provides better engagement with the channel structure, significantly improving resistance to impact loading while remaining relatively simple to form.
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
Enhances resistance to impact loading, provides a broad range of tensioning adjustability, and prevents galvanic corrosion by electrically isolating the screen from the channel, improving both functionality and aesthetics.
Implementation Method 1
This contact of dissimilar metals allows for galvanic corrosion at the interface between the screen and the channel
Implementation Method 2
an elastomeric gasket for sealing and compression
Data Source
AI summary
An adjustable screen re don system is presented. The present invention screen retention system comprises a mesh Of perforate screen retained within a frame composed of frame members have channel cross sections. The screen is formed with a rolled or U-shaped edge hem. The edge hem having a free edge that folds inwardly over the inner face of the screen and is parallel to, and spaced above, the inner face of the screen. The framing members are channel section extrusions which contain features for retaining, tensioning and locking the screen. The adjustable screen retention system herein presented improves upon the prior art by providing a more secure attachment of the screen within the channel of the frame members thereby providing increased resistance to screen impact loading. The new system also provides for a broader range of screen of tensioning adjustment than has heretofore been available and further electrically isolates the screen from the walls of the channel.