Sash Window Pivot Shoe Assembly for Dual Removal
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Solution Overview
Problem
Existing sash window designs often require customers to choose between lift-off and slide-off configurations, and manufacturers must produce multiple variants to meet different customer needs, which can complicate removal and reinstallation due to unpredictable pivot shoe movement.
Innovation Solution
A pivot shoe and mounting frame assembly that allows for both lift-off and slide-off functionality by pivoting to different positions, enabling the sash to be removed via lifting or sliding, with a locking mechanism to prevent unwanted movement and a braking system to secure the pivot shoe during removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single removal method (lift-off or slide-off) is used, then the device complexity is reduced, but the adaptability to different customer preferences is limited
Solution Approach 1:
The mounting frame is designed to perform multiple functions: it can provide both lift-off removal (by detaching from the pivot shoe) and slide-off removal (by sliding the mounting portion from the arm portion). This multi-functionality allows a single window assembly to accommodate different customer preferences without requiring separate designs.
Solution Approach 2:
The mounting frame incorporates dynamic elements including a pivotable connection between the mounting frame and pivot shoe, and a slidable connection between the mounting portion and arm portion. These dynamic connections allow the mounting frame to transition between different removal configurations based on operational needs.
2Reliability
If the pivot shoe is allowed to move freely during sash removal, then the ease of operation is improved, but the reliability of the removal process deteriorates due to unpredictable movement
Solution Approach 1:
The braking system is designed to engage automatically when the sash is tilted during removal. The brake member applies braking force to the pivot shoe in advance, preventing unwanted movement before it occurs. This preliminary action ensures stable pivot shoe positioning throughout the removal process.
3Reliability
If a locking mechanism is added to prevent pivot shoe movement, then the reliability of removal is improved, but the device complexity increases
Solution Approach 1:
The locking mechanism is designed as a self-service system where the brake member automatically engages with the pivot shoe through the existing tilting motion of the sash. No separate locking action or additional control mechanism is required - the removal process itself activates the braking and locking functions.
Data Source
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AI summary
ASSA ABLOY Limited have developed an assembly (200) for attaching a sash to a window frame. The assembly (200) comprises a mounting frame (300) for mounting to the sash and a pivot shoe (400). The mounting frame (300) comprises a mounting portion (301) slidably mounted to an arm portion (320), and the arm portion (320) is pivotally mounted to the pivot shoe (400). The mounting frame (300) is pivotable to a first position in which the mounting frame (300) can be removed from the pivot shoe (400), and to a second position in which the mounting portion (301) can be slidably removed from the arm portion (320).