Movable Sash Support for Tilt-Turn Fitting Scraping
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Solution Overview
Problem
Tilt-and-turn window door fittings often experience sash settlement issues, leading to scraping against the bottom when opening, and obstruction in the unlocked position, which compromises load-bearing capacity and structural integrity.
Innovation Solution
A support body that moves between protruding and retracted positions, coupled with a drive rod system, allowing for controlled movement and load distribution, avoiding scraping and obstruction while enabling high load support in the locked position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sash support uses fixed ramp and support elements, then the structure is simple, but the sash scrapes against the floor when opening due to settlement over time
Solution Approach 1:
The support body is designed to be movable between a protruding position (when lock is engaged) and a retracted position (when lock is disengaged), allowing it to adapt to sash settlement and prevent scraping against the floor while maintaining structural simplicity
2Strength
If the sash support remains in protruding position, then load-bearing capacity is maintained, but the sash is obstructed in the unlocked position
Solution Approach 1:
The support body automatically retracts when the lock is disengaged, clearing the sash path for smooth operation, and protrudes when the lock is engaged to provide load-bearing support, thus resolving the contradiction between strength and ease of operation
Solution Approach 2:
The support body is coupled to the lock mechanism via a connecting rod, allowing it to automatically adjust its position based on the lock state without requiring separate control mechanisms, thereby maintaining load-bearing capacity when needed and ensuring clearance when unlocked
3Reliability
If the support body is made movable between positions, then scraping and obstruction are prevented, but the device complexity increases
Solution Approach 1:
The support body's movement is coupled to the lock mechanism via a connecting rod, merging the support function with the locking function. This integration allows the support body to automatically adjust its position based on the lock state, preventing scraping and obstruction while minimizing additional complexity through functional integration
Data Source
Figure 1
Figure 2~3
Figure 4~7
AI summary
A fitting (3) for a sash (2) of a French door that pivots against a frame (1) has a sash support (8) that can be actuated together with a lock (7). The sash support (8) has a support body (13) that can be actuated by a movement of a drive rod (6). In an unlocked position of the lock (7), the support body (13) is in a retracted position and prevents the sash (2) from being obstructed during opening.