Radio Adapter with Magnet Actuated Reed Contacts
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Solution Overview
Problem
Existing solutions for detecting the status of windows and doors require new handles with integrated transmitters, leading to the need for multiple variants in different shapes and colors, and often result in mechanical wear and high production costs.
Innovation Solution
A radio adapter with magnet-operated reed contacts that can be mounted between a conventional handle and the door or window frame, allowing existing handles to be used, featuring a simple assembly, corrosion-free operation, and the ability to detect three positions ('closed', 'open', and 'tilted') using only two reed contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If new handles with integrated transmitters are used, then wireless detection function is achieved, but device complexity and production cost increase
Solution Approach 1:
The system is divided into two independent parts: a conventional handle (unchanged) and a separate radio adapter (added). The radio adapter contains the transmitter module, reed contacts, and antenna, while the handle retains its original mechanical structure. This segmentation allows the wireless function to be added without redesigning the handle itself.
Solution Approach 2:
The radio adapter acts as an intermediary component that bridges the conventional handle and the wireless detection system. It interfaces with the handle through mechanical mounting and detects position changes via reed contacts actuated by the handle's movement, then transmits this information wirelessly.
2Adaptability or versatility
If multiple handle variants in different shapes and colors are produced, then adaptability to different handles is achieved, but manufacturing cost increases
Solution Approach 1:
The radio adapter is designed as a universal device that can be mounted on any conventional handle regardless of shape, size, or color. The mounting structure uses generic features like screw holes and mechanical attachment points that are standard across most handles, eliminating the need to produce multiple specialized variants.
3Measurement precision
If mechanical contact switches are used, then position detection is achieved, but mechanical wear occurs
Solution Approach 1:
The mechanical contact switches are replaced with magnet-operated reed contacts. The reed contacts use magnetic field interaction instead of direct mechanical contact to detect handle position. The handle's movement actuates the reed contacts through magnetic coupling, eliminating wear while maintaining position detection capability.
4Power
If larger contact currents are used, then signal strength is improved, but battery life decreases
Solution Approach 1:
The contact current parameter is optimized to a specific low value range (0.5-2 mA) that provides sufficient signal strength for wireless transmission while minimizing power consumption. This parameter optimization balances the competing requirements of signal adequacy and battery life.
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
Enables cost-effective retrofitting of existing handles, reduces mechanical wear, and provides a long battery life with minimal energy consumption, while allowing for installation on non-vertical windows without operational issues.
Implementation Method 1
two reed contacts (13, 14) which are actuated by a permanent magnet (20)
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The radio receiver has a housing in which printed circuit board (12) is mounted having a drilling (3) for the passage of handhold actuating pin. Two opposite reed contacts (13,14) are mounted on the printed circuit board edge sided to the drilling. A rotatable engaging ratchet wheel (18) in drilling with central recess (21) corresponding to the square profile of the handhold actuating pin has a magnet carrier bag (19) with a permanent magnet (20).