Arched Junction Lever for Swiveling Casement Locking
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Solution Overview
Problem
Existing movement and locking devices for swiveling casements are structurally inhomogeneous, unsuitable for robust materials, and fail to effectively operate when the window sill is too low or when there is excessive distance between the casement and the window sill, leading to application issues and inefficiencies.
Innovation Solution
A movement device with a lever having two separate bodies joined at a curved end to form an arched adjustment and tightening member, providing a wide surface connection and allowing for linear adjustment, along with an extendable striker element and spacer accessory to accommodate varying window sill heights and distances, ensuring secure operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bulky junction is used at the corner of the casement to connect the lever, then the connection strength is improved, but the device becomes structurally inhomogeneous and unsuitable for robust molded metal or section bar materials
Solution Approach 1:
The patent applies curvature by designing the lever with an arched profile that conforms to the curved surface of the casement corner. This curved geometry allows the lever to distribute forces evenly across the junction area, achieving strong connection without requiring bulky additions that would disrupt the structural homogeneity of robust materials like molded metal or section bar.
2Reliability
If the descending extension is positioned close to the outer edge of the window sill, then the wind-induced slack is reduced, but the device cannot be applied when the window sill projects with respect to the alignment of the lever
Solution Approach 1:
The patent implements adjustability by allowing the lever's descending extension to be repositioned vertically along its length. This dynamic configuration enables the device to adapt to different window sill heights and projections while maintaining optimal positioning for wind resistance. The lever can be adjusted so that its end aligns with the window sill edge regardless of whether the sill projects forward or is recessed.
3Device complexity
If a single-point fulcrum connection is used, then the device structure is simplified, but the connection involves only a single point rather than a wide surface, creating breaking points
Solution Approach 1:
The patent segments the lever into two separate bodies that are joined at the arched end. This segmentation allows the connection to be distributed across a wide surface area at the arched junction rather than concentrated at a single point. The two bodies can be independently optimized while maintaining overall structural simplicity, eliminating breaking points through the distributed connection geometry.
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 solution results in a structurally harmonious, compact, and robust device that can effectively operate across different window configurations, preventing wind-induced closure and ensuring secure locking without structural weaknesses.
Implementation Method 1
parts provided with mutually engaging mirroring faces and with respective arched sliding seats arranged about a distant virtual fulcrum
Implementation Method 2
threaded coupling means
Implementation Method 3
a lever with two separate bodies joined at a curved end portion thereof to form an adjustment member
Implementation Method 4
swiveling casements, i.e., hinged at a side thereof
Implementation Method 5
a descending extension which, with the casement in an open configuration, descends below the surface of the window sill
Data Source
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AI summary
A movement and locking device for swiveling casements, i.e., hinged at a side thereof, for example and in particular window shutters, to facilitate the opening, closing and stopping in the open position without leaning from the window sill, an operating end of which in a foldable lever and with suitable adjustment means for making it applicable to the largest number of windows possible.