Sliding Door Sash Anti-Lifting Contact Element
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Solution Overview
Problem
Anti-lifting plugs in 'lift and slide' doors and windows are less effective and difficult to install, allowing potential lifting and unauthorized opening, especially in larger sash dimensions, due to reduced thickness and limited installation points.
Innovation Solution
Incorporating a first slider and rotatable contact element with drive means into the operating parts of the door/window, allowing the contact element to move between operating and non-operating positions, ensuring the sash cannot be lifted off the fixed frame in the lowered configuration, and allowing for secure installation before mounting the sash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anti-lifting plugs are fitted on 'lift and slide' doors and windows, then security against lifting is improved, but the plug thickness must be reduced which creates gaps and reduces effectiveness
Solution Approach 1:
The anti-lifting security function is divided into multiple contact elements distributed at different locations on the sash (corner regions and intermediate regions). Instead of relying on a single thick plug, multiple thinner contact elements work together to provide comprehensive security coverage across the entire sash width, preventing both corner and intermediate lifting attempts.
Solution Approach 2:
The security system transitions from a single-dimension vertical plug to a two-dimensional distributed array of contact elements across the sash width. Contact elements are positioned at corner regions and intermediate regions, creating a security network that spans the horizontal dimension, thereby preventing lifting attempts from multiple locations simultaneously.
2Reliability
If anti-lifting plugs are installed on the sash, then lifting protection is improved, but installation becomes difficult and limited to specific locations
Solution Approach 1:
The contact elements are designed to be universally applicable at multiple locations on the sash (both corner regions and intermediate regions). The same basic contact element design can be installed at any position along the sash width, providing flexibility in installation locations and simplifying the manufacturing and installation process compared to location-specific plugs.
Solution Approach 2:
The contact elements are integrated into the sash profile during the manufacturing process rather than being installed afterward. The sash profile includes pre-formed recesses or mounting features that accommodate the contact elements, allowing them to be positioned and secured during sash fabrication before the sash is installed in the door or window assembly.
3Ease of manufacture
If a single anti-lifting plug is used on one side of the sash, then installation is simplified, but security is reduced as lifting can occur from the opposite side
Solution Approach 1:
The security coverage is segmented into multiple zones across the sash width, with contact elements positioned at corner regions and intermediate regions. This segmentation ensures that lifting attempts from any location (left side, right side, or intermediate points) are met with resistance, eliminating the vulnerability of single-sided protection.
Solution Approach 2:
Multiple contact elements are combined into a unified security system where each element contributes to overall security coverage. The contact elements at different locations work together synergistically, creating comprehensive protection that covers the entire sash width, while still using relatively thin individual elements that are easy to install.
Data Source
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AI summary
A sliding door or window (1) comprises: a fixed frame (2); a sash (3) which slides horizontally and which has a perimeter groove (C); a pair of carriages (4, 4a) on which the sash (3) slides and which rest on a track (5); a controlling member (6) mounted on the sash (3), connected to operating means (7) which, when actuated by the controlling member (6), lift the sash (3) from the carriages (4, 4a) so that it can be slid open, and then lower the sash (3) when the sash (3) is returned to the closed position; a first slider (8) slidably fitted in the groove (C) made in an upper horizontal member (9) of the sash (3) and connected to the operating means (7); a first contact element (10) located in the proximity of the first slider (8) and rotatable between a lowered, non-operating position and a raised operating position; drive means (11) acting between the first slider (8) and the first contact element (10) and designed to allow a first position of lifting and stable positioning of the first contact element (10) when the sash (3) moves from the raised configuration to the lowered configuration in such a way as to prevent the sash (3) from being lifted off the fixed frame (2).