Stile and Rail Frame Assembly with Interlocking Tabs
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Solution Overview
Problem
Current frame assemblies for windows or doors are costly and time-consuming to manufacture due to the need for separate attachment components or complex tab-and-slot mechanisms, which also limit the structural integrity under normal forces.
Innovation Solution
A frame assembly design where stile and rail members are coupled by extending tabs that are bent around each other, eliminating the need for separate attachment components and allowing for interlocking without uniform cross-section requirements, thus reducing manufacturing costs and time while enhancing structural engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate attachment components (fasteners, adhesive strips, press-fit cornerlocks) are used to couple stile and rail members, then the frame assembly achieves reliable connection, but manufacturing cost increases and additional manufacturing steps are required
Solution Approach 1:
The attachment function is merged into the stile and rail members themselves through integrated tabs. The stile member includes a tab that engages with a recess in the rail member, eliminating the need for separate attachment components like fasteners, adhesive strips, or press-fit cornerlocks. This integration reduces manufacturing complexity while maintaining connection reliability.
Solution Approach 2:
The tabs and recesses are designed to self-align and self-engage during assembly. The tab on one member automatically fits into the recess of the other member without requiring additional alignment steps or separate attachment operations, enabling self-service assembly that reduces manufacturing time and complexity.
2Reliability
If tabs extend through slots in stile members to engage rail members, then connection is achieved, but manufacturing time increases and greater alignment care is required
Solution Approach 1:
The tab and recess design enables self-alignment during assembly. The geometries are configured so that the tab automatically guides itself into the recess without requiring precise external alignment or additional alignment steps, eliminating the time loss associated with manual alignment while maintaining reliable connection.
3Reliability
If the rail member has non-uniform cross-section to accommodate tabs, then tab engagement is enabled, but manufacturing cost increases because stile and rail members must be formed independently
Solution Approach 1:
The frame members are segmented to include integrated tabs and recesses as part of their structural geometry. The tab extending from the stile member and the corresponding recess in the rail member are formed as integral parts of each member, allowing both members to maintain uniform cross-sections while enabling reliable engagement. This segmentation approach allows standard manufacturing processes to be used without requiring independent formation of each member.
4Shape
If the rail member is completely disposed within the stile member, then a compact structure is achieved, but engagement between stile and rail members is limited
Solution Approach 1:
The rail member is nested within the stile member in a compact arrangement, with the tab extending from the stile member and engaging with the recess in the rail member. This nesting configuration achieves structural compactness while the protruding tab ensures reliable engagement by preventing separation in both horizontal and vertical directions, overcoming the limitation of complete enclosure.
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
This design minimizes manufacturing costs and time by eliminating the need for additional components and enhances structural integrity by ensuring secure engagement of stile and rail members under various forces.
Implementation Method 1
bending the stile tab about the rail member to couple the stile member to the rail member and bending the rail tab about the stile member to couple the rail member to the stile member
Data Source
AI summary
A method manufactures a frame assembly, which supports a fenestration article. The frame assembly includes a stile member having a stile tab. The frame assembly also includes a rail member coupled substantially transverse to the stile member. The rail member has a rail tab. The method comprises the step of inserting a portion of the stile member into an interior of the rail member such that the stile tab extends beyond the rail member. The method also comprises the step of inserting a portion the rail member into an interior of the stile member such that the rail tab extends beyond the stile member. The method further comprises the steps of bending the stile tab about the rail member to couple the stile member to the rail member and bending the rail tab about the stile member to couple the rail member to the stile member.