Window Locking Device with Toggle Lever Mechanism
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Solution Overview
Problem
Existing locking devices for rotating and tilting windows are difficult to use with corner bearings, as bolts mounted on horizontal or vertical bars obstruct movement, and require high structural effort when attempting to prevent unauthorized opening.
Innovation Solution
A locking device with a swiveling control lever and toggle lever mechanism, where the control lever and pivoting lever form a toggle lever, allowing easy transfer of pivoting movement to longitudinal bolt movement, and a deflectable button for position detection, enabling a large bolt stroke with minimal wing deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bolt is mounted on a horizontal bar to lock the sash, then the locking function is achieved, but the bolt blocks the movement of the wing in the tilted position
Solution Approach 1:
The bolt is made dynamically positionable through a control lever mechanism that allows it to move between a locked position (extending into the pocket) and an unlocked position (retracted). The control lever itself can pivot to accommodate different sash positions, enabling the locking system to adapt dynamically between closed, tilted, and rotary positions without the bolt permanently blocking movement paths.
2Reliability
If a bolt is mounted on a vertical bar to lock the sash, then the locking function is achieved, but the bolt blocks the movement in the rotary position
Solution Approach 1:
The control lever mechanism enables the bolt to dynamically adjust its position based on the sash orientation. When the sash is in the rotary position, the control lever pivots to allow the bolt to retract from the pocket, preventing interference with rotary movement while maintaining the capability to lock when the sash is closed or tilted.
3Reliability
If a connecting rod fitting is used to drive the locking device, then the locking function is achieved, but the structural effort is very high
Solution Approach 1:
The invention extracts and eliminates the connecting rod fitting from the system, replacing it with a direct control lever mechanism mounted on the sash. This simplification removes the intermediate connecting components while maintaining the essential locking function through the bolt and pocket arrangement controlled directly by the lever's pivoting motion.
Solution Approach 2:
The control lever is designed to be directly actuated by the sash's own movement. As the sash moves between closed, tilted, and rotary positions, the control lever automatically pivots accordingly, which in turn automatically moves the bolt into or out of the pocket. This self-actuating mechanism eliminates the need for external connecting rod mechanisms.
4Length of moving object
If a toggle lever mechanism is used to transfer pivoting movement to longitudinal bolt movement, then a large sliding path is generated with small deflections, but the device complexity increases
Solution Approach 1:
The control lever and the lever mounted on the fitting part are merged into a single toggle lever mechanism. This combined structure efficiently converts the small angular deflection of the control lever (caused by sash movement) into a large longitudinal displacement of the bolt through the geometric amplification inherent in toggle mechanisms, achieving motion amplification without requiring separate complex transmission components.
Data Source
Figure 1
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AI summary
A locking device (10) for a sash (2) that can be tilted and pivoted relative to a frame (1) has a locking mechanism (10) independent of a drive rod fitting (3) in one of two axes (7, 8) of the sash (2). A bolt (13) of the locking mechanism (10) can be actuated by a push button (18) which detects the position of the sash (2) relative to the frame (1). In a tilt position, the locking mechanism (10) is locked, so that the corner area of the window at the intersection of the axes (7, 8) is protected against unauthorized prying open.