Window Blind Controller Assembly Preventing Lift Cord Tangling
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Solution Overview
Problem
Conventional window blind devices experience issues with improper operation leading to loosening or tangling of lift cords, particularly when transforming between positions, due to improper handling of actuating cords, causing the bottomrail to move upward over the middlerail or the middlerail to move downward over the bottomrail.
Innovation Solution
A controller assembly comprising a housing, first and second tube units with threaded surfaces, and first and second runners with stop tabs, which are configured to prevent sliding and rotation in specific directions, ensuring proper alignment and preventing loosening or tangling of lift cords by allowing controlled movement of the window blind components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the window blind device is transformed between positions by actuating cords, then the shading position can be adjusted, but the lift cords may loosen or tangle due to improper operation
Solution Approach 1:
The controller assembly acts as an intermediary mechanism between the actuating cords and the lift cords. It includes tube units with threaded surfaces that engage with runners, creating a controlled transmission system that prevents direct harmful interaction between cord movement and lift cord tension, thereby preventing loosening or tangling while maintaining position adjustability
Solution Approach 2:
The controller assembly applies preliminary anti-action by using stop tabs on the runners that engage with the tube units before improper movement can occur. This preventive mechanism blocks the bottomrail from moving upward over the middlerail and prevents the middlerail from moving downward over the bottomrail, counteracting potential harmful movements before they can damage the lift cords
2Adaptability or versatility
If the bottomrail moves upward over the middlerail or the middlerail moves downward over the bottomrail, then position transformation occurs, but this causes loosening or tangling of lift cords
Solution Approach 1:
The stop tabs on the runners engage with the tube units to prevent the harmful movements of the bottomrail moving upward over the middlerail or the middlerail moving downward over the bottomrail. This preliminary blocking action occurs before the harmful movement can generate, thereby preventing lift cord loosening or tangling while still allowing proper position transformation
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 controller assembly effectively prevents the middlerail from moving downward over the bottomrail and the bottomrail from moving upward over the middlerail, thereby reducing the likelihood of lift cord loosening or tangling, ensuring smooth and controlled operation of the window blind device across various positions.
Implementation Method 1
The first runner has a first inner threaded bore which is configured to be in threaded engagement with the first outer threaded surface of the first tube unit. The second runner has a second inner threaded bore which is configured to be in threaded engagement with the second outer threaded surface of the second tube unit.
Data Source
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AI summary
A controller assembly (900) includes a housing (2), first and second tube units (3, 4), and first and second runners (5, 6) . In response to sliding of the first runner (5) to bring the first runner (5) into abutment with the second runner (6), the first runner (5) is prevented from sliding over the second runner (6), whilst impeding rotation of the first tube unit (3) . In response to sliding of the second runner (6) to bring the second runner (6) into abutment with the first runner (5), the second runner (6) is prevented from sliding over the first runner (5), whilst impeding rotation of the second tube unit (4).