Scissor Fitting Displaceable Coupling for Window Sash Rubbing
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Solution Overview
Problem
Existing scissor fittings for windows and doors often result in the sash rubbing against the lower section of the window frame when closed, due to an ineffective determination of the scissor fitting's effective length, leading to mechanical stress and potential damage.
Innovation Solution
The scissor fitting's first coupling point is made displaceable relative to the faceplate, allowing the effective length to be determined by a fixed point on the faceplate and the scissor arm's coupling point on the window frame, which shortens as the sash tilts closed, preventing the sash from rubbing against the lower frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the effective length of the scissor fitting is determined by a fixed first coupling point on the faceplate, then the structure is simple and stable, but the sash rubs against the lower section of the window frame when closed
Solution Approach 1:
The first coupling point is made displaceable relative to the faceplate, allowing it to move in a direction transverse to the axis of rotation. This dynamic adjustment enables the effective length to change automatically based on the sash position, preventing the sash from rubbing against the lower frame while maintaining structural stability.
Solution Approach 2:
The effective length parameter of the scissor fitting is made variable through the displaceable first coupling point. By changing the position of this coupling point, the effective length adjusts automatically, solving the problem of fixed-length-induced friction between the sash and frame.
2Length of moving object
If the effective length of the scissor fitting is too long, then the sash can be fully extended, but the sash runs up or rubs against the lower section of the window frame when closed
Solution Approach 1:
Rather than using a fixed effective length, the invention makes the effective length dynamic through the displaceable first coupling point. This allows the system to automatically adjust the effective length based on operational conditions, preventing both excessive length (causing rubbing) and insufficient length (limiting extension).
Solution Approach 2:
The displaceable first coupling point enables the scissor fitting to self-adjust its effective length automatically during operation. The system serves itself by automatically preventing the sash from rubbing against the frame without requiring external intervention or complex control mechanisms.
Data Source
Figure 1~2
Figure 3A~4B
AI summary
The invention relates to a fitting arrangement (11) for a window, a door or the like, having a scissors fitting comprising a scissors arm (13) and a scissors link (15) coupled in an articulated manner to the scissors arm, wherein the scissors link is mounted at a first coupling point (39) to a cover rail (17), which is assigned to the window sash or the door leaf, so as to be rotatable about an axis of rotation (49), wherein the scissors link at the first coupling point is displaceable with respect to the cover rail in a direction transverse to the axis of rotation and a stop (18) for the scissors link is provided on the cover rail, which stop is positioned and designed such that, when the sash/leaf is closed by tilting, the scissors link is displaced by the stop with respect to the cover rail, resulting in a shortening of the effective length of the scissors fitting.