Retractable Window Handle for Espagnolette Mechanisms
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Solution Overview
Problem
Conventional operating handles for espagnolette mechanisms in window panels project significantly from the panel, obstructing transportation efficiency, increasing packaging requirements, and potentially obstructing emergency exits, while also requiring rebating that can interfere with the gearbox and adjacent window panels.
Innovation Solution
A surface-mounted operating handle with a handle part that moves between a storage and operating position, allowing for reduced projection and rebating, featuring a key-operated lock and a drive element with a pivot shaft and assembly element to distribute rotational forces effectively, enabling efficient use and assembly without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operating handle projects significantly from the panel to enable user grip and force application, then the ease of operation is improved, but the transportation efficiency deteriorates and packaging requirements increase
Solution Approach 1:
The operating handle is designed to be movable between a retracted storage position and an extended operating position. In the storage position, the handle minimizes projection from the panel for efficient transportation and packaging. When moved to the operating position, the handle extends to provide sufficient leverage and grip area for users to apply the necessary force to actuate the espagnolette mechanism.
2Ease of operation
If the operating handle projects significantly from the panel, then the ease of operation is improved, but the safety deteriorates due to potential obstruction of emergency exits
Solution Approach 1:
The operating handle can be retracted into a storage position that minimizes its projection from the panel, ensuring it does not obstruct emergency exits or create safety hazards when not in use. When needed for operation, the handle is extended to provide the necessary leverage for actuating the securing mechanism, thus balancing safety requirements with operational effectiveness.
3Ease of manufacture
If rebating is performed to accommodate the operating handle, then the ease of manufacture is improved, but the reliability deteriorates due to interference with the gearbox and adjacent window panels
Solution Approach 1:
The operating handle assembly is designed as a separate, self-contained unit that mounts to the surface of the window panel without requiring rebating. This segmentation isolates the handle from the internal gearbox and adjacent panel structures, eliminating the risk of interference while maintaining ease of manufacture through simple surface mounting.
4Device complexity
If the operating handle is designed as a single fixed component, then the device complexity is reduced, but the ease of operation deteriorates due to insufficient force application capability
Solution Approach 1:
The operating handle incorporates a movable component that can extend and retract. This dynamic element provides the necessary leverage and grip area for users to apply sufficient force to actuate the securing mechanism, while the overall design remains relatively simple and does not significantly increase device complexity.
Data Source
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AI summary
The invention relates to an operating handle (10, 210), primarily to actuate an espagnolette mechanism for securing or locking a hinged window panel. The operating handle has a mounting part (12; 112; 212) and a handle part (14; 114; 214), the mounting part being adapted for surface mounting to the panel. The handle part is movable relative to the mounting part between a storage position and an operating position, and in the operating position is rotatable relative to the mounting part. The invention also provides a modified drive element and an adjustable handing element to convert the operating handle from clockwise to anticlockwise movement.