Potentiometer Sensor for Window Position Detection
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Solution Overview
Problem
Existing devices for monitoring the open, tilted, and closed states of windows or doors are unreliable over long periods, often misreporting states due to non-specific resistance changes in pressure sensors and require extensive wiring and multiple reed contacts.
Innovation Solution
A potentiometer-based sensor with a sliding contact that converts the distance between the window or door sash and frame into a proportional change in travel, allowing for precise determination of the current position and enabling easier identification of intermediate states, reducing wear and simplifying calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pressure sensor is used to detect window or door states, then the device can monitor open, tilted, and closed positions, but the resistance changes are large and not specific enough to reliably detect all three states
Solution Approach 1:
The patent changes the measurement parameter from pressure (resistance) to position (distance). Instead of measuring pressure exerted on a sensor, the system measures the distance between the movable element and the frame using a potentiometer. This provides specific, reliable detection of all three states (open, tilted, closed) with clear resistance value ranges for each state.
2Adaptability or versatility
If reed contacts are used to monitor window or door states, then the device can detect open, tilted, and closed positions, but extensive wiring and multiple reed contacts are required
Solution Approach 1:
The patent merges multiple detection functions into a single potentiometer sensor. Instead of using multiple reed contacts with separate wiring for each state detection, one potentiometer simultaneously provides all three state measurements (open, tilted, closed) through its continuous position sensing capability, dramatically reducing wiring complexity.
Solution Approach 2:
The potentiometer serves multiple functions: it detects open position, tilted position, and closed position, and can also provide intermediate position information. This single universal sensor replaces multiple specialized reed contacts, simplifying the overall device architecture.
3Productivity
If a metal pin pressed against a pressure sensor is used, then the device can detect window or door position, but the pressure sensor becomes unreliable after prolonged use
Solution Approach 1:
The patent replaces the mechanical pressure sensing system with an electrical position sensing system. Instead of a metal pin physically pressing against a pressure sensor (mechanical contact), the system uses a potentiometer where a wiper moves along a resistive track, converting mechanical position into electrical signal without the wear and reliability issues of pressure sensors.
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 provides reliable long-term monitoring of window or door positions, allowing for accurate detection of all states, including intermediate positions, and reduces wear, enhancing the device's reliability and ease of calibration.
Implementation Method 1
the sensor is designed in the manner of a potentiometer which has a slider or sliding contact that can be adjusted from the wing
Data Source
Figure 1a~1c
Figure 2~3
Figure 4~5
AI summary
The device has a sensor (4) provided for the assembly between a window frame (2) and a wing (1) of a window or a door, where the sensor has an electrical resistor that is changed based on opened, tilted and closed condition of the wing and is attached to an electrical circuit for outputting conditional signal indicating the conditions. The sensor is formed based on the type of a potentiometer that has a slider adjustable by the wing.