Window Sash Opening Limiter With Automatic Partial-Open Lock
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Solution Overview
Problem
Existing window and door assemblies lack a reliable and simple mechanism to limit the rotation to a defined, partially open position, risking accidental movement due to wind or improper operation.
Innovation Solution
A wing arrangement with a frame and a pivotable wing, featuring an opening limiting device comprising a switching rod, guide, and pivot arm, which allows defined pivoting to a partially open position and is locked automatically, using a self-locking device with a pivot bolt and locking element actuated by a handle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotation limiting arrangement is provided on a window with a frame and sash, then the sash can be locked in a partially open position, but the device complexity increases with multiple components like rotatable locking elements and rotation limiters
Solution Approach 1:
The opening limiting device automatically locks the sash in the partially open position through the interaction between the pivot arm engaging the guide groove's closed end and the self-locking device. The system serves itself by using the sash's own position to trigger the locking action, eliminating the need for separate control mechanisms and reducing overall device complexity while maintaining reliability
Solution Approach 2:
The invention combines the opening limiting function and the self-locking function into a single integrated device. The pivot arm, guide groove, and self-locking device work together as one unified mechanism rather than separate components, reducing the number of parts and simplifying the overall structure while ensuring reliable limitation of rotation
2Manufacturing precision
If multiple switches or additional mechanisms are added to control the opening position, then the opening control becomes more precise, but the ease of operation decreases requiring additional switches
Solution Approach 1:
The system automatically determines and locks at the correct opening position based on the sash's movement itself. The pivot arm naturally engages the closed end of the guide groove when the sash reaches the desired partially open position, triggering automatic locking without requiring the user to operate additional switches or controls, thus maintaining both precision and ease of operation
3Device complexity
If a simple opening limiter design is used, then the device complexity is reduced, but the reliability decreases risking incorrect operation or accidental movement
Solution Approach 1:
The self-locking device automatically engages when the pivot arm reaches the closed end of the guide groove, using the sash's own movement to trigger the locking action. This self-actuating mechanism ensures reliable locking without complex control systems, as the locking is triggered automatically by the physical position of the sash itself
Solution Approach 2:
The guide groove is designed with a closed end that provides a natural stopping point for the pivot arm. The curved or contoured end of the groove ensures that the pivot arm reliably engages at the correct position, providing inherent mechanical guidance that enhances reliability without adding complexity to the overall design
4Ease of operation
If the sash can pivot freely without limitation, then the ease of operation is maximized, but the risk of accidental closure or wind-induced movement increases
Solution Approach 1:
The system allows the sash to move freely during normal operation but automatically locks itself when reaching the partially open position. The self-locking mechanism activates based on the sash's position, providing automatic protection against wind-induced movement or accidental closure without restricting the user's ability to open and close the sash normally
Solution Approach 2:
The opening limiting device pre-establishes a defined stopping point (the closed end of the guide groove) before the sash can be fully opened. This preliminary limitation prevents the sash from reaching positions where it could be accidentally closed or damaged by wind, while still allowing full freedom of movement within the safe operating range
Data Source
Figure 1
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Figure 4a~4b
AI summary
The invention relates to a wing arrangement (10) comprising a frame (12) and a wing (14) of a door or window pivotably mounted on the frame (12), wherein an opening limiting device (40) is provided which allows the wing (14) to pivot relative to the frame (12) only to a partially open position, wherein the opening limiting device (40) comprises a switching rod (46), a guide device (48) and a pivot arm (44), wherein the guide device (48) has a guide groove (52) closed at one end, wherein in the partially open position of the wing the pivot arm engages with a pin (50) in the guide groove and rests against its closed end (76), wherein a self-locking device (42) is provided which is configured to automatically lock the pin in such a way that the pin is caught in the guide groove when it rests against the closed end of the guide groove.