Window Fitting Locking Hook for Sash Width Limit
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Solution Overview
Problem
Existing window fitting solutions for limiting opening width lack stability and are overly complex, with components experiencing high loading during operation, making them prone to instability and difficult to assemble.
Innovation Solution
A compact and stable fitting design featuring a lockable connection between the slider and bearing part via a braking and coupling device, with a sliding shoe adapted to guide grooves in frames or sashes, and a locking hook that reduces actuator loading by biasing into the locking recess, allowing easy adaptation and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a spring-loaded locking pin and movable actuator are used to control the slider, then the opening width can be limited and adjusted, but the device becomes complex with many components to assemble
Solution Approach 1:
The patent extracts and eliminates the spring-loaded locking pin and movable actuator from the system. Instead, it uses a simple fixed locking pin that engages with a slot in the slider, dramatically reducing the number of components while maintaining the ability to limit and adjust opening width.
Solution Approach 2:
The patent segments the control mechanism into distinct functional elements: a fixed locking pin for limitation, a slot in the slider for positioning, and a stop on the limiting element for maximum opening control. This segmentation simplifies the overall structure while maintaining versatility.
2Adaptability or versatility
If the locking means is subjected to regular stress during sash movement, then the opening width can be limited, but the components lose stability over time
Solution Approach 1:
The patent applies preliminary action by pre-positioning the locking pin in a fixed location that engages with the slot before the sash reaches the limiting position. This ensures the locking mechanism is already in place to prevent excessive opening, eliminating the need for continuous stress during movement.
Solution Approach 2:
The slot in the slider acts as an intermediary element between the fixed locking pin and the moving sash. This intermediary design allows the locking pin to engage smoothly without subjecting it to regular stress, as the slot guides the interaction and distributes the load.
3Adaptability or versatility
If a guide shoe adapted to guide grooves is used, then the fitting can be easily adapted to different frames and sashes, but the structure becomes more complex
Solution Approach 1:
The patent applies universality by designing the guide shoe and guide groove as a standardized interface that can accommodate different frame and sash configurations. The guide shoe attaches to the limiting element and interfaces with the guide groove in the frame, providing a universal solution that simplifies adaptation without increasing overall structural complexity.
Data Source
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AI summary
A fitting (3) for limiting the opening width of a sash (2) that pivots against a frame (1) has a slider (12) guided in a fitting groove and a locking hook (23). The locking hook (23) engages in an elongated locking recess (21). A stop (24) arranged in the locking recess (21) limits the movement of the locking hook (23) and thus the opening width of the sash (2).