Roof Window Screening Assembly via Inverted Casing
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Solution Overview
Problem
Existing screening arrangements for roof windows are complex to manufacture due to small clearances during assembly, which can lead to nicks, bumps, and increased time or steps to avoid these issues.
Innovation Solution
A screening arrangement with a winding device featuring a winding reel connected to a roller bar, where the top casing is designed with a bottom end element and a top end element that support and connect the roller bar, simplifying assembly by eliminating the need for the roller bar to be introduced through an opening in the top casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the roller bar is introduced through an opening in the top casing during assembly, then the assembly process becomes complex and time-consuming, but the structural integrity is maintained
Solution Approach 1:
Instead of introducing the roller bar through an opening in the top casing, the patent inverts the assembly approach by forming the top casing around the roller bar. The roller bar is positioned first, then the top casing is assembled around it, eliminating the need for large openings and complex insertion maneuvers.
Solution Approach 2:
The patent applies preliminary action by pre-positioning the roller bar and winding reel assembly before closing the top casing. The roller bar is inserted into the bottom element first, and the winding reel is attached, so that when the top element is connected, everything is already in place, eliminating the need for complex in-situ assembly operations.
2Manufacturing precision
If small clearances are present during assembly, then nicks and bumps are created by unwanted contact between components, but maintaining tight tolerances increases manufacturing difficulty
Solution Approach 1:
The patent introduces an intermediary approach by designing the top casing with end elements that provide controlled clearance management. The bottom element and top element are designed with specific geometries that maintain appropriate clearances between the roller bar and casing walls, preventing unwanted contact that causes nicks and bumps while avoiding the need for extremely tight tolerances.
3Reliability
If the winding reel is not constrained during assembly, then unwanted movement occurs leading to assembly errors, but adding constraint mechanisms increases device complexity
Solution Approach 1:
The patent merges the constraint function into the existing structural elements of the top casing. The bottom element and top element are designed to naturally constrain the winding reel through their geometries and the space they define, rather than adding separate constraint mechanisms. The engagement means of the winding reel connect directly to the roller bar, providing inherent constraint during assembly.
Data Source
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AI summary
A screening arrangement for a roof window, and roof window comprising such a screening arrangement. The screening arrangement (50) comprises a screening device (60) comprising a top casing (61). The top casing (61) comprises a bottom element (61a) and a top element (61b) delimiting a bar space accommodating and limiting movement of the roller bar (61r). The bottom element (61a) is configured to receive and support the roller bar (61r) during assembly of the screening arrangement (50). The top element (61b) is configured to be connected to the bottom element (61a) subsequent to the bottom element (61a) receiving the roller bar (61r). A winding device comprising a winding reel (671) is connectable to the roller bar (61r) at the first longitudinal end (61r1) of the roller bar (61r). Furthermore, the top casing (61) comprises a bottom end element (611a) and a top end element (611b) adjacent to the first longitudinal end (61r1) of the roller bar (61r) and further delimiting the bar space. The bottom end element (611a) and the top end element (611b) delimit a reel space (61w) accommodating and limiting movement of the winding reel (671). The bottom element (61a) of the top casing (61) is configured to receive and support the roller bar (61r) during assembly of the screening arrangement (50) and the top element (61b) is configured to be connected to the bottom element (61a) subsequent to the bottom element (61a) receiving the roller bar (61r).