Pivotable Window Sash Pin Positioning for Stress-Free Tilting
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Solution Overview
Problem
Existing tilt-and-turn window and door fittings often require complex mechanisms to enable tension-free tilting, which can lead to structural complexity and inefficiencies.
Innovation Solution
A window or door design featuring a locking piece on a vertical frame spar with a drive rod and pin that engages behind the locking piece for tilting, where the pin's center maintains a distance of 4mm to 29mm from the frame's rebate top, avoiding high contact pressure and allowing tension-free tilting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pin center is positioned closer to the frame rebate top, then the tilting mechanism becomes simpler, but high contact pressure from sash overhang occurs on the frame
Solution Approach 1:
The invention changes the vertical position parameter of the pin center relative to the frame rebate top, specifying it should be between 4mm and 29mm. This parameter optimization simultaneously achieves simple tilting mechanism operation and avoids excessive contact pressure by positioning the pivot point at an optimal distance that balances mechanical simplicity with stress distribution.
2Stress or pressure
If the pin center is positioned farther from the frame rebate top, then contact pressure is reduced, but the tilting mechanism becomes more complex and tension-free tilting cannot be achieved
Solution Approach 1:
The invention establishes an optimal parameter range (4mm to 29mm) for the pin center distance from the frame rebate top. This parameter optimization ensures that the tilting mechanism achieves tension-free operation while maintaining acceptable contact pressure levels, avoiding the need for more complex mechanisms that would be required if the pin were positioned farther away.
3Reliability
If a complex mechanism is used to enable tension-free tilting, then tilting performance is improved, but structural complexity increases
Solution Approach 1:
The invention achieves tension-free tilting by optimizing the pin center position parameter rather than employing complex mechanisms. By positioning the pin center 4mm to 29mm from the frame rebate top, the design naturally enables tension-free operation through proper force distribution, eliminating the need for additional complex components while maintaining reliable tilting performance.
Data Source
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AI summary
The invention relates to a window (10) or a door with a tiltable and turnable sash (14). A tilt axis of the sash (14) is realized at a sash corner by a horizontally extending pin (18) which, in the tilt position, engages a locking element (20) on a vertical frame member. When the sash (14) is in contact with the frame (12), the pin (18) is positioned only between 4 mm and 29 mm above the rebate surface of the frame (12) in order to achieve stress-free tilting of the sash (14) and to prevent excessive pressure of a sash overlap against the frame (12).