Curtain Crank Structure with Rolling Wheels and Engagement Mechanism
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Solution Overview
Problem
Curtain pull cords are prone to entanglement and knotting due to wind, and pose a safety risk when young children play with them, as they are often made of strong ropes or chains.
Innovation Solution
A crank structure for curtains comprising a base with a rolling wheel set, an engagement set, and a crank, featuring a tear-shaped limiting frame, rolling wheels with braking gears and inclined rings, and an engagement mechanism with a supporting wheel and elastic member to securely manage the cord, preventing entanglement and allowing easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If strong ropes or chains are used for pull cords, then the cord strength is improved, but the safety risk increases when children play with them
Solution Approach 1:
The patent removes the traditional pull cord from the system and replaces it with a crank mechanism. The cord is extracted from its conventional hanging function and integrated into a controlled winding system where it is managed by rolling wheels and engagement mechanisms, eliminating the safety hazard of exposed strong ropes while maintaining cord strength for curtain operation
Solution Approach 2:
The patent introduces a crank mechanism as an intermediary between the user and the curtain cord. This intermediary device includes a base with rolling wheels, engagement sets with elastic members, and a crank arm that mediates the interaction between the user's manual input and the curtain's movement, providing controlled cord management and eliminating direct exposure of strong ropes
2Ease of operation
If long hanging cords are used for curtain operation, then the ease of operation is improved, but the cord entanglement and knotting increases due to wind
Solution Approach 1:
The patent employs dynamic elements including rolling wheels that rotate to wind and unwind the cord, an elastic member that provides flexible engagement and disengagement, and a crank arm that converts rotational motion into cord winding. These dynamic components allow the cord to be actively managed during operation, preventing entanglement while maintaining ease of use
Solution Approach 2:
The patent replaces the simple mechanical hanging cord system with a more complex mechanical system involving rolling wheels with braking gears, engagement sets with elastic members, and a crank mechanism. This substitution transforms the passive hanging cord into an actively managed system where the cord is wound and unwound in a controlled manner, eliminating wind-induced entanglement
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 crank structure prevents cord entanglement and knotting, enhances curtain operation, and ensures safety by restricting the cord's movement, preventing accidental child interaction.
Implementation Method 1
The limiting column is configured for being jacketed with an elastic member and pushes against the socket and the supporting wheel with the elastic member
Data Source
AI summary
A crank structure for a curtain has a base, a rolling wheel set, an engagement set and a crank. The base has a bottom plate and a limiting frame. The rolling wheel set is disposed in the storing space of the base and has two rolling wheels. Each central aperture is jacketed onto the central shaft of the storing space. The two rolling wheels is further respectively provided with a braking gear and an inclined ring. Each inclined ring has a plurality of engagement ribs. The engagement set disposed in the assembling portion of the base and has a socket, a supporting wheel and a bottom member. An engaging pattern is provided at a periphery of the supporting wheel, a passive gear is provided at the supporting wheel, and a shaft is provide at a center position of the supporting wheel.