Window Shade Actuating System with Ratcheting Switch
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Solution Overview
Problem
Conventional window shades with long operating cords pose safety risks for children and are inconvenient for users due to entanglement issues, and existing solutions often require different actions for raising and lowering the shades.
Innovation Solution
A window shade actuating system featuring a transmission axle, planetary gears, and a switch member that allows for a single pull member to be used for both raising and lowering the shade by switching between two driving modes, with a compact pull member length and a ratcheting mechanism for easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a longer operating cord is used to raise window shades with greater vertical lengths, then the window shade can be operated, but the outer appearance is affected and there is a risk of child strangulation
Solution Approach 1:
The harmful operating cord is extracted and replaced with a pull member that is integrated into a safe retraction mechanism. The pull member is withdrawn into a recessed cavity when not in use, eliminating the strangulation hazard while maintaining the ability to operate the shade.
Solution Approach 2:
A ratcheting mechanism acts as an intermediary between the pull member and the drive axle. This mechanism allows the pull member to be short and safe while still providing the necessary force transmission to raise and lower the shade through controlled engagement and disengagement.
2Length of moving object
If a longer operating cord is used for greater vertical lengths, then the window shade can be operated, but manipulation becomes less convenient due to entanglement
Solution Approach 1:
The operating cord is extracted and replaced with a short pull member that is automatically retracted into a recessed cavity. This eliminates entanglement issues while maintaining full operational capability through the ratcheting mechanism.
Solution Approach 2:
The pull member transitions from a static long cord to a dynamic short member that is actively retracted and deployed as needed. The ratcheting mechanism provides dynamic control, allowing the pull member to be engaged only when operation is required, preventing entanglement during normal use.
3Object-affected harmful factors
If existing approaches use a mechanism actuated by repeated pulling actions for raising, then safety is improved, but a manual action different from the pulling action for lowering is required
Solution Approach 1:
The pull member and ratcheting mechanism serve multiple functions: they provide safe operation by eliminating long cords, and they enable both raising and lowering actions through the same pulling motion. The ratchet allows bidirectional control using a single type of manual action.
Solution Approach 2:
Instead of requiring different actions for raising and lowering, the system inverts the approach by allowing the same pulling action to control both directions. The ratcheting mechanism enables the pull member to engage for raising and disengage for lowering, making the operations symmetric and intuitive.
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 system provides a safe and convenient operation by reducing the risk of child strangulation, minimizing cord length for easier handling, and allowing for efficient raising and lowering with a single pull member, enhancing user experience while maintaining the shade's functionality.
Implementation Method 1
a first central gear, a plurality of first planetary gears respectively meshed with the first central gear, a second central gear rotationally coupled with the transmission axle, a plurality of second planetary gears respectively meshed with the second central gear and the first planetary gears
Data Source
AI summary
The structures described herein use an actuating system that can selectively switch between a lower and a raise mode of operation by rotating a rod assembly, and use a downward displacement of a pull member to lower and raise the window shade depending on whether its switching state. The actuating systems are simple to operate, allow convenient adjustment of the window shade, and are safe as the pull member has a limited length of extension.