Lift-Slide Fitting Coupling Lever Joint for Roller Wear Reduction
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Solution Overview
Problem
Existing lift-and-slide element fitting arrangements experience uneven loading on rollers during raising and lowering, leading to uneven wear and increased maintenance costs due to undesirable tilting of the carriage frame.
Innovation Solution
A fitting arrangement with a coupling lever joint that allows relative movement in a direction transverse to the displacement, enabling the carriage frame to compensate for vertical force components and prevent excessive tilting, thus ensuring even loading on the rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a purely rotatable or articulated connection is used between the coupling lever and the carriage frame, then the structure is simple, but the carriage frame experiences excessive tilting and uneven loading on the rollers
Solution Approach 1:
The joint between the coupling lever and carriage frame is transformed from a fixed rotatable connection to a dynamic connection that allows both rotation and relative displacement. The coupling lever can move relative to the carriage frame in a direction transverse to the displacement direction, enabling the carriage frame to compensate for inclination caused by vertical force components during raising and lowering operations.
2Stability of the object's composition
If the coupling lever is rigidly connected to the carriage frame, then the structure is stable, but the rollers experience uneven loading and accelerated wear
Solution Approach 1:
The rigid connection is replaced with a dynamic joint that permits controlled relative movement. This allows the carriage frame to adjust its position relative to the coupling lever, compensating for forces that would otherwise cause uneven roller loading while maintaining overall structural stability during operation.
3Reliability
If a joint allowing relative movement is introduced between the coupling lever and carriage frame, then the roller wear is reduced, but the device complexity increases
Solution Approach 1:
The joint is segmented into distinct functional elements: the coupling lever, the carriage frame, and the connection interface that permits relative movement in a transverse direction. This segmentation allows each component to perform its specific function while collectively reducing roller wear through the introduced degree of freedom.
Data Source
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AI summary
The present invention relates to a fitting arrangement for a lifting-sliding element which comprises a window frame and a wing which is slidable along a track in a sliding direction relative to the window frame. The fitting assembly comprises: at least one base part which is designed for attachment to the wing; at least one carriage having a carriage frame and at least two rollers mounted on the carriage frame; a lifting mechanism for raising the wing relative to the carriage frame from a lowered position into a raised position, the lifting mechanism comprising an inclined guide by means of which the carriage frame is slidably guided on the base part in a direction extending so as to be inclined with respect to the sliding direction; and a coupling lever having a first end which is coupled to the carriage frame, and a second end which is articulated to a bell crank articulated to the base part and via which the lifting mechanism can be actuated by means of a connecting rod, the first end of the coupling lever being coupled to the carriage frame via a joint which allows relative movement between the first end of the coupling lever and the carriage frame in a direction extending transversely to the sliding direction.