Blind Lifting Module With Torsion Spring Anti-Backdrive
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Solution Overview
Problem
Existing blind lifting devices face issues with stability and ease of operation, particularly in preventing entanglement of children and objects with the pull cord.
Innovation Solution
A blind lifting device with a supporting unit, transmitting wheel, anti-backward unit, and driving unit, featuring a torsion spring and ratchet mechanisms that allow uni-directional rotation and stable operation, along with a rotating support module for controlled lifting and lowering of blinds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pull cord is used for blind lifting operation, then ease of operation is improved, but cord entanglement with children and objects creates safety hazards
Solution Approach 1:
The harmful pull cord is extracted and replaced with a button-operated control mechanism. The button (332) is disposed inside the housing (301) and can be pushed to operate the blind, eliminating the external pull cord that causes entanglement hazards while maintaining ease of operation through simple button pressing action.
2Reliability
If a ratchet mechanism is used for uni-directional rotation control, then reliability of blind lifting is improved, but device complexity increases
Solution Approach 1:
Multiple functions are merged into the button mechanism. The button (332) serves as both the operating interface for lifting the blind and as part of the locking mechanism working with the cam (321) and cam groove (322). This integration maintains reliability through the ratchet-like cam groove design while minimizing device complexity by combining control and locking functions in a single compact assembly.
3Stability of the object's composition
If a torsion spring is used for frictional engagement, then stability of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The torsion spring (311) provides dynamic frictional engagement that adapts to operational conditions. The spring can tighten or loosen its engagement with the inner peripheral wall based on the rotational state and load conditions, providing stable operation through self-adjusting friction rather than requiring fixed precision clearance or interference fits that would demand high manufacturing precision.
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 device ensures steady and convenient operation, preventing cord entanglement and allowing for controlled lifting and lowering of blinds with reduced effort, enhancing safety and usability.
Implementation Method 1
the torsion spring is in tightly frictional engagement with the inner peripheral wall to permit a uni-directional rotation of the transmitting wheel
Implementation Method 2
a reel biasing member disposed to bias the driving reel to rotate to reel the pull cord
Implementation Method 3
first and second ratchet portions respectively meshable with corresponding third and fourth ratchet portions of an anti-backward wheel and a driving reel
Data Source
AI summary
A blind lifting control module includes a transmitting wheel, an anti-backward unit and a driving unit disposed to a supporting unit. The transmitting wheel for connecting a blind reeled horizontal axle has a wheel ratchet portion meshable with a corresponding reel ratchet portion of a driving reel of the driving unit. The anti-backward unit has a torsion spring operable and deformable relative to the transmitting wheel. A pull cord is reeled on the driving reel and has a free end passing through a thrust member and a hindering member, and is pulled to shift the torsion spring to a released state to permit lowering of a blind. The thrust member is turned by pulling of the pull cord to thrust the driving reel to mesh with the transmitting wheel for lifting the blind.