Window Blind Auxiliary Unit for Slat Alignment
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Solution Overview
Problem
Conventional window blinds face issues with light leakage due to the fixed length of lift cords, which restrict the rotation of the bottom rail and slats, preventing complete closure and an effective light-blocking effect.
Innovation Solution
A window blind design incorporating a headrail, a covering assembly, a lifting mechanism, a tilt mechanism, and an auxiliary unit that allows the lift cord assembly to be released further, enabling the bottom rail to tilt beyond its initial position, ensuring the slats and bottom rail can align parallel again for optimal light blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lift cord assembly has a fixed length to support the bottom rail, then the lifting mechanism can maintain stable support, but the bottom rail cannot rotate to a fully closed position causing light leakage
Solution Approach 1:
The lift cord assembly transitions from a fixed length state to a releasable state through the auxiliary unit. When the modulation mechanism is operated, the auxiliary unit allows the lift cord assembly to be gradually released, enabling the bottom rail to rotate further than before while maintaining controlled support throughout the motion.
Solution Approach 2:
The auxiliary unit acts as an intermediary between the lifting mechanism and the modulation mechanism. It receives input from the modulation mechanism and translates it into controlled release of the lift cord assembly, mediating between the conflicting requirements of stable support and full rotation capability.
2Ease of operation
If the lift cords are pulled up by interference to enable full rotation, then the bottom rail can reach fully closed position, but the force balance is disrupted causing the bottom rail to raise to a higher position
Solution Approach 1:
The auxiliary unit provides dynamic control over the lift cord assembly release, allowing gradual adjustment rather than sudden interference. This enables the bottom rail to rotate to the fully closed position while maintaining force balance, preventing unintended raising of the bottom rail.
Solution Approach 2:
The auxiliary unit changes the operational parameters of the lift cord assembly by allowing controlled release during rotation. This parameter change enables the bottom rail to achieve full rotation while maintaining proper positioning, avoiding the force balance disruption caused by traditional interference methods.
3Stability of the object's composition
If the lift cord assembly length is fixed once the slat assembly is fully expanded, then the lifting mechanism maintains stable support, but the slats near the bottom rail cannot be rotated to fully closed position
Solution Approach 1:
The auxiliary unit introduces dynamic control to the previously static lift cord assembly. When rotation of slats near the bottom rail is required, the auxiliary unit allows controlled release of the lift cord assembly, enabling these slats to rotate to the fully closed position while maintaining overall system stability.
Data Source
AI summary
A window blind includes a headrail, a covering assembly including a plurality of slats and a bottom rail, a lifting mechanism including a driving module and a lift cord assembly operably connected to the driving module, a tilt mechanism adapted to drive the slats to rotate, and an auxiliary unit provided between the tilt mechanism and the lifting mechanism. The lift cord assembly is connected to the bottom rail for expanding or folding the covering assembly. The covering assembly is in a first state when each and every one of the slats is substantially parallel to each other and correspondingly rotatable by the tilt mechanism, and is in a second state otherwise. When the covering assembly is in the second state, the auxiliary unit is drivable by the tilt mechanism to make the lifting mechanism further release the lift cord assembly, changing the covering assembly into the first state again.