Magnetic Child Safety System for Chain-Operated Blinds
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Solution Overview
Problem
Current child safety devices for chain-operated blinds and curtains are ineffective for continuous chains, cannot handle forces greater than 3kg, cause high friction, and lose functionality after repeated use, limiting their application and efficiency.
Innovation Solution
A magnetic child safety system with a safety device coupled to a chain command device, featuring a transmission wheel with interior toothing and neodymium magnetic coupling, which decouples when a force of 6kg or more is applied, ensuring safety and easy re-coupling, compatible with European safety standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If magnetic coupling means are used to couple the safety device to the chain command device, then the safety device can be easily and quickly recoupled after decoupling, but the coupling strength must be precisely calibrated to decouple at exactly 6kg force
Solution Approach 1:
The patent uses magnetic coupling means with adjustable magnetic force parameters to achieve precise decoupling at 6kg force threshold while maintaining easy recoupling capability. The magnetic field strength can be calibrated to provide the exact force needed for safe operation.
Solution Approach 2:
The patent replaces traditional mechanical coupling mechanisms (screws, clips, or interlocking parts) with magnetic coupling means, enabling easy recoupling through simple proximity placement while providing controlled force characteristics through magnetic field calibration.
2Reliability
If the safety device is designed to decouple at 6kg force threshold, then it complies with European safety standards and prevents child strangulation, but it cannot handle chains requiring greater than 3kg tractive force for heavier blinds
Solution Approach 1:
The patent designs the safety device with universal applicability to different chain ratios (1:1, 4:1, 5:1) by using a standardized magnetic coupling interface and force threshold that works across multiple blind weights and chain configurations, making it adaptable to various safety and operational requirements.
3Ease of manufacture
If traditional safety devices are placed externally on the chain, then they can be easily installed, but they cause high friction in the transmission system and reduce efficiency
Solution Approach 1:
The patent merges the safety device with the chain command device by integrating the magnetic coupling means directly into the chain mechanism, eliminating the need for external attachments and reducing friction losses while maintaining ease of installation through modular magnetic components.
4Length of moving object
If the safety device uses balls smaller than or equal to the chain balls for reset, then it can pass through the chain command, but it requires increased difficulty to reset after opening
Solution Approach 1:
The patent replaces the traditional mechanical reset mechanism (requiring manual manipulation of small balls through tight spaces) with magnetic coupling means that automatically recouple when brought into proximity, eliminating the difficulty of resetting small components and making the process intuitive and easy.
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 magnetic child safety system effectively prevents strangulation by decoupling under excessive force, maintaining functionality and compatibility with various chain ratios and repeated use, while adhering to European safety standards.
Implementation Method 1
magnetic coupling means configured to couple the safety device to the chain command device; and the chain command device comprises a fairing and a cover for the fairing that comprise a transmission gear, a base, a set of planetary gears, an actuator of the brake, a transmission of the brake, springs of the brake and a brake cylinder, wherein the transmission gear comprises a toothed head configured to fit into the interior toothing of the transmission wheel of the safety device and magnetic coupling means complementary to the magnetic coupling means of the transmission wheel
Implementation Method 2
The magnetic coupling means are configured to decouple the safety device from the chain command device when a tension is applied to the chain loop in a vertical direction towards the ground, which is greater than or equal to a predetermined threshold fixed at 6Kg
Data Source
Figure 1~2a
Figure 3~3a
Figure 4a~4c
AI summary
The invention relates to a magnetic child safety system (1) for the mechanism of a chain-operated blind, comprising a safety device (2) that can be coupled, via magnetic coupling means, preferably neodymium magnets, to a chain command device (3), wherein the magnetic coupling means are configured to decouple the safety device (2) from the chain command device (3) when a tension is applied to the chain loop (6) in a vertical direction towards the ground, which is greater than or equal to a predetermined threshold fixed at 6kg.