Roof Window Base Frame Module with Stepped Corner Connections
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Solution Overview
Problem
Conventional roof window frames face issues with unfavorable shear stress due to snow loads, difficulty in connecting frame sections with different cross-sections, and inadequate condensation drainage, especially in closed frame shells.
Innovation Solution
A base frame module with longitudinal and transverse legs featuring projecting and recessed sections for corner connections, allowing easy assembly and improved force absorption, along with integrated drainage channels to manage condensate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional miter joint connections are used for frame sections, then assembly is simple and frames form a closed shell, but the fasteners are subjected to unfavorable shear stress under snow loads
Solution Approach 1:
The corner connection is segmented into a recessed section and a projecting section, allowing the frame legs to be divided into functional zones that distribute mechanical loads differently, reducing shear stress on fasteners
Solution Approach 2:
The connection transitions from a planar miter joint to a three-dimensional stepped configuration with recessed and projecting sections, enabling force distribution in multiple directions and reducing shear stress concentration
2Adaptability or versatility
If frame sections with different cross-sections are connected using conventional methods, then connection is difficult and requires considerable effort, but the frame can accommodate various design requirements
Solution Approach 1:
The recessed section and projecting section design creates a universal connection interface that can accommodate frame legs with different cross-sections, allowing the same connection mechanism to work across various design configurations
Solution Approach 2:
By segmenting the connection into recessed and projecting sections, the design allows different cross-sections to be joined through a standardized interface, reducing assembly complexity while maintaining adaptability
3Strength
If frame sections are connected to form a closed frame shell, then structural integrity is improved, but condensation drainage becomes difficult and requires well-sealed joints
Solution Approach 1:
The frame connection is segmented into recessed and projecting sections that create distinct functional zones, allowing the joint area to serve both structural and drainage functions simultaneously
Solution Approach 2:
The recessed section acts as an intermediary element between connecting frame legs, providing a built-in drainage pathway that mediates between the need for structural integrity and condensation removal
Data Source
Figure 1~2
Figure 3~4
Figure 5a~6
AI summary
The invention relates to a base frame module for roof windows, comprising: a longitudinal leg and a transverse leg, which are arranged substantially at right angles to each other and are connected substantially at right angles to each other at one end region; wherein the longitudinal leg and the transverse leg each have a projecting section and a recessed section at the connected end regions; wherein the recessed section of the longitudinal leg abuts a lateral region of the projecting section of the transverse leg at its end face; and wherein the recessed section of the transverse leg abuts a lateral region of the projecting section of the longitudinal leg at its end face.