Window Security Device Detects Fitting Position
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Solution Overview
Problem
Existing security devices for windows and doors lack reliability and convenience in detecting unauthorized openings, as they require manual activation and deactivation, leading to potential false alarms and reliance on user attention.
Innovation Solution
A security device that detects the state and position of a fitting arrangement, allowing for automatic activation or deactivation based on the fitting's position, eliminating the need for manual intervention and enhancing the detection of permissible or impermissible openings by considering the fitting's position in conjunction with the window's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual activation and deactivation of the alarm device is implemented, then the alarm can be controlled to trigger only when needed, but the reliability decreases due to potential user oversight and false alarms
Solution Approach 1:
The system automatically determines whether an opening is permissible or impermissible by detecting the state of the fitting arrangement, eliminating the need for manual activation or deactivation of the alarm device. The security device monitors the fitting's position and automatically triggers the alarm only when an impermissible opening is detected, making the system self-regulating and removing human error from the equation.
Solution Approach 2:
The system performs preliminary detection of the fitting arrangement's state before determining whether to trigger an alarm. By continuously monitoring the fitting's position and comparing it against predefined criteria for permissible openings, the system prepares in advance to trigger the alarm only when necessary, avoiding both false alarms and missed detections.
2Reliability
If the alarm device is continuously active, then unauthorized openings are reliably detected, but false alarms increase due to permissible openings being treated as unauthorized
Solution Approach 1:
The system applies different evaluation criteria based on the local state of the fitting arrangement. By detecting specific positions of the fitting (such as locked versus unlocked states), the system determines whether an opening should trigger an alarm. This localized quality assessment allows the system to distinguish between permissible openings (when the fitting is in an unlocked position) and impermissible openings (when the fitting is locked), eliminating false alarms while maintaining reliable detection.
Solution Approach 2:
The system changes the parameter being monitored from a simple binary open/closed state to a multi-state detection based on the fitting arrangement's position. By detecting parameters such as the fitting's locked/unlocked status and comparing it against the sash's opening state, the system dynamically adjusts its alarm trigger criteria, allowing permissible openings to occur without triggering false alarms while maintaining security against unauthorized openings.
3Device complexity
If the security device monitors only the wing's open/closed state, then the system remains simple, but it cannot distinguish between permissible and impermissible openings
Solution Approach 1:
The security device leverages the existing multi-functional fitting arrangement, which serves both as a locking mechanism and as a detection element. By monitoring the fitting's position (which controls whether the sash can be opened), the system gains additional information without adding separate monitoring systems. The fitting arrangement's inherent positions (locked, unlocked, partially locked) provide the necessary data to distinguish between permissible and impermissible openings, achieving high measurement precision while maintaining relatively simple device complexity.
Data Source
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AI summary
A securing device for securing the wing of a window, door or the like against impermissible opening is designed to detect a state of the wing, which can be in a closed state or in an open state, and to detect a position of a fitting assembly of the wing, which can be moved between an unlocking position and one or more locking positions, wherein the wing can be opened completely, in particular opened by rotation when the fitting assembly is in the unlocking position, and the wing can be opened only to a limited extent, in particular opened by tilting, or is prevented from opening when the fitting assembly is in one of the locking positions. The securing device is also designed to output a state signal, in particular to an alarm device, according to both the detected state of the wing and the detected position of the fitting assembly.