Push-Pull Curtain with Self-Locking Reel Mechanism
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Solution Overview
Problem
Conventional roller shades are cumbersome and pose safety hazards due to exposed drawstrings, which are difficult to control and can entangle or trip individuals, especially children, as they require laborious pushing and pulling and lack self-locking positioning capabilities.
Innovation Solution
A lifting push-pull positioning curtain system featuring a push-pull positioning device within a mounting box, comprising an active reel, transmission wheel set, and slave reel, utilizing a scroll spring mechanism to allow infinite adjustment of curtain length without exposing the drawstring, ensuring the curtain body can be self-locked at any position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional roller shade with exposed drawstring is used, then the curtain can be lifted and lowered, but the exposed drawstring poses safety hazards and is cumbersome to control
Solution Approach 1:
The patent extracts the harmful exposed drawstring from the system and replaces it with a concealed reel mechanism. The drawstring function is transferred to an internal reel that can be rotated to lift the curtain, eliminating the safety hazard while maintaining the lifting function. The reel is mounted within the headrail, so no exposed cord hangs outside.
Solution Approach 2:
The patent introduces a reel as an intermediary mechanism between the user's hand and the curtain fabric. Instead of directly pulling an exposed drawstring, the user rotates the reel, which winds the cord internally to lift the curtain. This intermediary mechanism provides both safety (no exposed cord) and ease of operation (simple rotational motion).
2Ease of operation
If a conventional roller shade with pull rope is used, then the curtain can be controlled, but it requires laborious pushing and pulling
Solution Approach 1:
The patent inverts the conventional operation method. Instead of pulling the curtain down and pushing it up (laborious bidirectional operation), the reel mechanism allows the curtain to be lifted by rotating the reel in one direction, while gravity naturally lowers it. This inversion of the lifting/lowering mechanism eliminates the need for laborious pushing and pulling.
Solution Approach 2:
The patent employs a spring-based counterweight mechanism that balances the curtain's weight. The spring is wound in the opposite direction to the curtain's weight, creating a counterbalancing force. This allows the curtain to be easily lifted by small rotations of the reel while automatically returning to its lowered position, reducing time consumption and effort.
3Ease of operation
If a conventional roller shade is used, then the curtain can be retracted, but the exposed drawstring is entangled with other objects
Solution Approach 1:
The patent extracts the exposed drawstring from the operational space and relocates it entirely within the headrail as part of the reel mechanism. The cord is wound internally on the reel, so it cannot protrude or entangle with surrounding objects. Only the essential rotational interface of the reel remains exposed, eliminating the entanglement hazard.
4Extent of automation
If a conventional roller shade with retracting mechanism is used, then the curtain can be wound up, but the mechanism is complex
Solution Approach 1:
The patent merges the lifting mechanism, positioning function, and retraction system into a single integrated reel assembly. The reel simultaneously performs all these functions: rotating to lift, self-locking to position, and internal cord storage for retraction. This consolidation eliminates the need for separate complex mechanisms while maintaining automation capabilities.
Solution Approach 2:
The patent implements self-service features through the reel mechanism's inherent self-locking capability. When rotation stops, the reel automatically locks at any position without requiring additional locking mechanisms or manual intervention. The spring-based system also provides automatic return to the lowered position, reducing the need for complex control systems.
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 eliminates the need for exposed drawstrings, allowing for simple operation and safe positioning of the curtain, balancing the curtain's gravity with elastic force to maintain any desired position while preventing excessive spring force from causing automatic rising or dropping.
Implementation Method 1
the driven wheel receive a scroll spring therein; the head end of the scroll spring is connected to the driving wheel... the gravity of the curtain body is balanced with the elastic force of the scroll spring
Data Source
AI summary
The object of the present invention is to provide a lifting type push-pull positioning curtain which can realize the self-locked positioning of the curtain body without the exposed drawstring and can adjust the unfolding length of the curtain body infinitely. A lifting type push-pull positioning curtain, comprises a curtain body, a mounting box and a push-pull positioning device. The push-pull positioning device comprises an active reel, a transmission wheel set and a slave reel. The transmission wheel set comprises a driving wheel and a driven wheel, the driven wheel receive a scroll spring therein, the head end of the scroll spring is connected to the driving wheel; the active reel and the slave reel are wound with a thread rope therein respectively, and one end of the thread rope is fixed to the reel and the other end thereof is fixed to the bottom of the curtain.