Block and Tackle Window Blind Cord Synchronization
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Solution Overview
Problem
Conventional cordless window blinds experience inconsistent cord winding, leading to an inclined bottom rail and operational smoothness issues, affecting both functionality and aesthetics.
Innovation Solution
A window blind design incorporating a block and tackle system with a lifting cord assembly, where the lifting cord assembly is pulled by the same lengths on both sides, ensuring the bottom rail remains horizontal during slat assembly operation, utilizing a driving module and modulation assembly to synchronize the movement and maintain the rail's horizontal state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If soft cords are independently wound around cord rollers on two sides, then the window blind can be operated without exposed cords, but inconsistent winding movements or irregular overlapping of cords cause the bottom rail to incline
Solution Approach 1:
The patent combines the independent cord winding systems into a unified block and tackle system where two lifting cords work together through a common movable pulley. This merging ensures that both cords are wound by the same mechanism, preventing inconsistent winding and maintaining the bottom rail's horizontal state while eliminating exposed cords.
Solution Approach 2:
The patent introduces a movable pulley as an intermediary component in the block and tackle system. This mediator synchronizes the winding of both lifting cords, ensuring they are reeled in by the same mechanism and preventing irregular overlapping, thus maintaining bottom rail horizontality while achieving cordless operation.
2Object-affected harmful factors
If soft cords are independently wound around cord rollers, then cordless operation is achieved, but the overall looking of the window covering becomes unbeautiful due to irregular cord overlapping
Solution Approach 1:
The patent combines the independent cord winding systems into a unified block and tackle system where two lifting cords work together through a common movable pulley. This merging ensures that both cords are wound by the same mechanism, preventing inconsistent winding and maintaining the bottom rail's horizontal state while eliminating exposed cords.
Solution Approach 2:
The patent introduces a movable pulley as an intermediary component in the block and tackle system. This mediator synchronizes the winding of both lifting cords, ensuring they are reeled in by the same mechanism and preventing irregular overlapping, thus maintaining bottom rail horizontality while achieving cordless operation.
3Stability of the object's composition
If a block and tackle system is used to synchronize cord winding, then the bottom rail maintains horizontal state, but the device complexity increases
Solution Approach 1:
The block and tackle system performs multiple functions: it synchronizes cord winding, maintains bottom rail horizontality, and provides mechanical advantage for lifting. By combining these functions into a single well-established mechanism, the patent avoids the need for separate complex control systems for each function.
Solution Approach 2:
The block and tackle system automatically synchronizes the winding of both lifting cords through its mechanical structure. The movable pulley self-adjusts to ensure equal cord lengths on both sides, eliminating the need for external sensors, motors, or control systems to maintain balance.
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
Ensures smooth operation and maintains the bottom rail in a horizontal state, enhancing both functionality and aesthetic appeal by preventing irregular cord winding and overlapping, thus improving the overall performance and appearance of the window blind.
Implementation Method 1
A block and tackle system, which includes a movable member and a lifting cord assembly, is provided in the headrail
Data Source
AI summary
A window blind includes a headrail and a covering structure provided below the headrail. The covering structure includes multiple slats, which can be turned, lifted, and lowered. A driving module is immovably provided in the headrail and includes a power unit. A modulation assembly includes an adjustment member which is drivable to drive an adjustment cord assembly, turning the slats. A block and tackle system is provided in the headrail, and includes a movable member, which is drivable by the power unit to optionally reciprocate in a longitudinal direction of the headrail. A lifting cord assembly is connected to the block and tackle system, and extends out of the headrail to be fixedly connected to a bottom of the covering structure. When the movable member reciprocates in the longitudinal direction, the lifting cord assembly is driven to lift or lower the covering structure.