Adjustable Screen Door Frame with Mechanical Tenons
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Solution Overview
Problem
Existing screen doors, particularly rollformed aluminum ones, face issues with corner stability leading to jamming and the need for frequent replacement due to loosening from repeated use, while existing patents lack effective screen affixment mechanisms and adjustable joint solutions.
Innovation Solution
A screen door design featuring a substantially continuous spline with a screen affixment mechanism that covers a standing ridge, mechanical tenons contained within the material of the stiles and rails, and accessible for tightening or loosening, along with a paired stabilizer system for enhanced structural integrity and ease of assembly/disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If rollformed aluminum screen doors are used, then manufacturing cost is reduced, but corner stability deteriorates leading to jamming and frequent replacement
Solution Approach 1:
The patent applies nesting by placing the spline inside the recessed groove of the corner assembly, and the corner assembly inside the rollformed aluminum frame. This nested structure allows the corner to be securely held while maintaining the cost-effective rollformed construction. The spline acts as an internal stabilizer that nests within the corner geometry, preventing the corner from loosening during repeated door operations.
Solution Approach 2:
The patent uses composite construction by combining rollformed aluminum with separate corner assemblies made from different materials (aluminum or wood) and splines. This composite approach allows the main frame to remain inexpensive rollformed aluminum while the corners use more stable materials and structures, resolving the contradiction between low cost and corner stability.
2Strength
If mechanical tenons are contained entirely within stile material, then structural integrity is improved, but accessibility for adjustment is reduced
Solution Approach 1:
The patent segments the tenon structure into internal and external portions. The main body of the tenon is contained entirely within the stile material to maintain structural integrity, while a portion of the tenon extends through the stile to provide external accessibility. This segmentation allows the tenon to serve dual functions: structural reinforcement when embedded and adjustment access when protruding.
Solution Approach 2:
The patent makes the tenon dynamic by allowing it to be adjusted from an embedded state (for structural integrity) to a protruding state (for accessibility). The tenon can be inserted fully into the stile for maximum strength, or partially withdrawn to allow access to the spline and screen adjustments, enabling the structure to adapt between strength and adjustability modes.
3Reliability
If spline extends onto stile material, then screen affixment is improved, but joint complexity increases
Solution Approach 1:
The patent applies universality by making the spline multi-functional. The spline serves both as a screen holder (its primary function) and as a structural element that extends onto the stile to reinforce the joint and provide additional screen affixment surface. This eliminates the need for separate reinforcement elements, maintaining reliability while controlling complexity through functional consolidation.
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 a strong, easily assembled, and adjustable screen door frame that minimizes tool requirements, allows for joint tightening, and features a frictional screen attachment, enhancing durability and reducing the need for frequent replacements.
Implementation Method 1
a spline cover vertically attached in frictional engagement with the standing ridge
Data Source
AI summary
An adjustable assembly double stabilized screen door that forms a strong frame and requires minimal effort to assemble, disassemble and/or tighten wherein the door contains multiple stiles and rails forming joints containing mechanical tenons.