Roof Window Fastening Device Positioning Projection
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Solution Overview
Problem
Existing roof windows face challenges in simpler and faster assembly, with issues such as misalignment and varying air gaps due to play and deformations, leading to difficulties in complete closure and locking.
Innovation Solution
A roof window design featuring a fastening device with a positioning projection that interacts with a positioning device on the sash frame to ensure proper alignment and centering, allowing for easy installation and secure closure, comprising a holding part attached to the window frame and a cover part that engages with the sash frame via a form-fitting connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional fastening device is used to attach the cover plate to the window frame member, then the cover plate can be secured, but the assembly process becomes time-consuming and complex
Solution Approach 1:
The fastening device is divided into two functional parts: a holding part that attaches to the window frame member and a cover part that secures the cover plate. This segmentation allows for simpler individual components that can be manufactured and assembled more quickly, directly addressing the contradiction between assembly speed and device complexity.
Solution Approach 2:
The holding part is pre-attached to the window frame member before the cover plate installation. This preliminary action simplifies the overall assembly process by eliminating the need for complex multi-step fastening operations during final assembly, thereby improving assembly speed without significantly increasing device complexity.
2Manufacturing precision
If play and deformations in the sash frame and window frame are present, then the structure can accommodate manufacturing tolerances, but misalignment and varying air gaps occur
Solution Approach 1:
The positioning projection acts as an intermediary element between the fastening device and the sash frame. It compensates for play and deformations by providing a positive positioning feature that ensures accurate alignment of the sash frame with the window frame, thereby achieving high alignment precision without compromising the stability that accommodates manufacturing tolerances.
Solution Approach 2:
The positioning projection changes the geometric parameters of the connection by providing a fixed reference point that defines the exact position of the sash frame. This parameter change ensures consistent alignment and minimal air gaps while still allowing the overall structure to accommodate normal manufacturing variations through controlled flexibility in the frame connections.
3Ease of operation
If the casement is rotatably mounted with play in the bearing, then the window can open and close smoothly, but the air gap varies on opposite sides
Solution Approach 1:
The positioning projection serves as a mediator that compensates for bearing play in the rotatable mounting. It provides a fixed reference point that ensures consistent air gaps on all sides when the window is closed, while still allowing smooth opening and closing operations through the rotatable bearing mechanism.
4Reliability
If multiple fastening points are used to secure the cover plate, then the attachment is more reliable, but the assembly process becomes more time-consuming
Solution Approach 1:
The fastening device is segmented into a holding part and a cover part, where the holding part provides reliable attachment to the window frame member and the cover part secures the cover plate. This segmentation achieves reliable attachment with fewer fastening operations, thereby improving assembly speed without sacrificing attachment reliability.
Data Source
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AI summary
The invention relates to a roof window with a frame (2) and a sash frame (3) which is movable relative to the frame (2) and carries a glazing, wherein the frame (2) has at least one frame member (4) to which a cover plate (7) extending along the frame member (4) is attached by means of a fastening device (9).The fastening device (9) comprises a retaining part (10) attached to the frame member (4) and a cover part (11) attached to the frame member (4) via the retaining part (10), wherein the cover part (11) is connected to the retaining part (10) by means of a positive locking fastening device (13) and serves to hold the cover plate (7) on the frame member (4), wherein the fastening device (9) has a positioning projection (17) extending beyond a base body (18) of the retaining part (10) in the direction away from the frame member (4) for positioning the sash frame (3) relative to the frame (2) when the roof window (1) is closed by means of a positioning device (23) provided on the sash frame (3).