Self-Locking Worm Gear Window Fitting Adjustment Mechanism
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Solution Overview
Problem
Existing fitting arrangements for windows and doors face issues with unreliable adjustment mechanisms, particularly longitudinal adjustment mechanisms that shift over time, requiring repeated adjustments to maintain proper alignment and prevent uneven gaps.
Innovation Solution
Incorporating self-locking longitudinal and transverse adjustment mechanisms, utilizing worm gears to ensure that adjustments are consciously made and maintained, with a carriage system and housing for stability and protection, and an assembly play to facilitate precise positioning and load transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a longitudinal adjustment mechanism is used to move the frame part and wing part relative to each other parallel to the pivot axis, then the fitting arrangement can be adjusted for proper alignment, but the mechanism shifts over time requiring repeated adjustments
Solution Approach 1:
The patent replaces a standard mechanical adjustment mechanism with a worm gear mechanism. The worm gear engages with a gear wheel to convert rotational movement into linear adjustment movement, while the self-locking property of the worm gear prevents back-driving and maintains the adjusted position without shifting over time.
Solution Approach 2:
The patent changes the mechanical parameters of the adjustment mechanism by introducing a self-locking worm gear with specific geometric parameters. The worm gear's thread angle and engagement geometry are designed to provide sufficient friction and mechanical advantage to lock the adjustment in place, preventing time-dependent drift while maintaining adjustability.
2Adaptability or versatility
If an adjustment unit is added to correct positioning inaccuracies, then the fitting arrangement can compensate for errors, but the device complexity increases
Solution Approach 1:
The adjustment unit is designed to perform multiple functions: it enables longitudinal adjustment parallel to the pivot axis, transverse adjustment perpendicular to the pivot axis, and automatically maintains positioning through self-locking. This multi-functionality reduces the need for separate adjustment mechanisms for each degree of freedom.
Solution Approach 2:
The patent combines the longitudinal and transverse adjustment mechanisms into a single integrated adjustment unit that operates on the same carriage assembly. Both adjustment mechanisms share common components such as the carriage, guide elements, and housing, reducing overall device complexity compared to separate independent adjustment systems.
3Reliability
If self-locking mechanisms are implemented to prevent displacement, then adjustment reliability is improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex locking mechanisms (such as separate locks, brakes, or clamps) with a self-locking worm gear mechanism. The self-locking property arises naturally from the worm gear's geometry and friction characteristics, providing reliable adjustment maintenance without requiring additional locking components or control systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The self-locking mechanisms prevent unwanted displacement, ensuring reliable and permanent adjustments, simplifying the installation process by maintaining alignment without mechanical stress, and allowing for precise positioning of multiple fitting arrangements without interference.
Implementation Method 1
The longitudinal adjustment mechanism comprises at least one worm gear
Implementation Method 2
the longitudinal adjustment mechanism has self-locking properties
Data Source
Figure 1~2
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AI summary
A fitting arrangement for a sash of a window, door, or the like is described, comprising a sash part (14) designed for attachment to the sash and a frame part (12) designed for attachment to a fixed frame. The sash part and the frame part are pivotably coupled to each other about a pivot axis, and the frame part (12) and the sash part (14) are movable relative to each other in a direction (B1) parallel to the pivot axis for adjustment purposes by means of a longitudinal adjustment mechanism (42) of an adjustment unit, wherein the longitudinal adjustment mechanism (42) has self-locking properties.