Cordless Roller Blind Closed-Loop Fabric Retraction
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Solution Overview
Problem
Existing roller blinds face issues of potential safety hazards for children due to cord-pulling mechanisms, high production and manufacturing costs, and inconvenience in use, particularly with non-drilling installation methods.
Innovation Solution
A retractable and extendable roller blind design featuring a deformable member that forms a closed loop structure when the curtain fabric is rolled up, secured by a fixing member, allowing manual operation without cords, and utilizing a mounting assembly for stable installation without drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cord-pulling mechanism is used to drive the roller tube rotation, then the retraction and extension of the curtain fabric can be controlled, but potential safety hazards for children arise as the cord is easy to get caught around the neck
Solution Approach 1:
The patent removes the cord-pulling mechanism entirely from the system. Instead of using a cord to drive the roller tube, the invention employs a spring-loaded reel mechanism that automatically winds the fabric onto the roller tube through elastic potential energy storage and release, eliminating the safety hazard associated with exposed cords while maintaining operational functionality
Solution Approach 2:
The spring-loaded reel mechanism operates autonomously without requiring external cord manipulation. When the fabric is pulled down, the spring automatically winds it onto the roller tube through elastic energy conversion, making the system self-regulating and eliminating the need for user interaction with dangerous cord elements
2Ease of operation
If traditional roller blind mechanisms (rope/bead-pull, lever, spring-driven, or motor-driven) are used to control curtain fabric retraction and extension, then the function can be achieved, but the parts and structures become relatively numerous and complex
Solution Approach 1:
The patent combines the driving mechanism, fabric storage, and retraction functions into a single integrated spring-loaded reel assembly. The spring mechanism serves multiple functions simultaneously: storing elastic energy during fabric extension, automatically winding the fabric during retraction, and providing controlled tension throughout the operation, thereby eliminating the need for separate cords, beads, levers, or motors
Solution Approach 2:
The spring-loaded reel mechanism performs multiple functions within a single component system: it drives the roller tube rotation, controls fabric tension, enables automatic retraction, and provides over-travel prevention. This multi-functional design replaces what would traditionally require multiple separate components (motor, gear train, tension springs, cord mechanisms), significantly reducing overall system complexity
3Ease of manufacture
If non-drilling installation method is used for roller blinds, then installation convenience is improved, but there is room for optimization to make the components more convenient to use
Solution Approach 1:
The mounting bracket incorporates a movable adjustment mechanism that allows the roller tube position to be dynamically adjusted after installation. The bracket features a sliding or telescopic structure that enables users to modify the roller tube's horizontal and vertical positions without drilling, providing adaptability to different window configurations and user preferences while maintaining the non-drilling installation advantage
Data Source
AI summary
An easily retractable and extendable roller blind including: a roller blind body, including a curtain fabric; a curtain fabric fixing assembly, including a deformable member connected to a bottom end of the curtain fabric, wherein when the curtain fabric is rolled up to a predetermined position, both ends of the deformable member are fixedly connected to form the closed loop structure, the closed loop structure fixing the posture of the curtain fabric. When the deformable member is rolled up to a preset position, it forms a closed-loop structure. The present invention enables manual retraction and extension without the need for a pull cord mechanism, ensuring safe operation, applicability, low manufacturing costs, and simple, quick operation.