Window Blind Transmission Assist Structure for Stable Retraction
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Solution Overview
Problem
Existing window blind assemblies with built-in Venetian blinds face issues where the magnetic force of the control mechanism is insufficient to fully retract the blinds due to increasing gravity, leading to incomplete folding or the blinds falling down due to excessive weight.
Innovation Solution
A window blind assembly incorporating a force-assisting unit with a spring that increases resistance to weight when retracting and decreases when expanding, combined with a brake unit that generates friction to resist rotation, ensuring smooth operation and preventing slats from falling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the Venetian blind is pulled upward to a folded state using only magnetic force, then the control mechanism is simple, but the magnetic force becomes insufficient as slats overlap and gravity increases, preventing complete retraction
Solution Approach 1:
The patent introduces a spring-based force-assisting unit that acts as a counterweight mechanism. The spring is pre-compressed to generate an upward force that counteracts the downward gravitational force on the slats during retraction. This allows the control mechanism to overcome gravity without requiring excessive magnetic force, resolving the contradiction between simple control structure and sufficient lifting force.
Solution Approach 2:
The patent employs a dynamically adjustable spring force system where the spring compression varies during the retraction process. As slats overlap and gravity increases, the spring maintains appropriate compression to provide matching counterbalancing force. This dynamic adjustment allows the magnetic control to effectively manage varying gravitational loads throughout the retraction sequence.
2Device complexity
If the Venetian blind is completely retracted using only magnetic force, then the control mechanism remains simple, but the slats may fall down due to excessive weight when gravity exceeds magnetic force
Solution Approach 1:
The spring-based force-assisting unit continuously provides upward counterbalancing force to offset gravitational pull on the slats. This ensures that even when the magnetic control force is insufficient or disengaged, the spring maintains the slats in a stable retracted position and prevents them from falling down due to excessive weight.
Solution Approach 2:
The spring is pre-compressed beforehand to store elastic potential energy that cushions against the gravitational force before the slats can fall. This prior cushioning ensures that the system is already prepared to counteract gravity, providing immediate stability when the blind is retracted and preventing sudden drops or instability.
3Force
If a spring force-assisting unit is added to counteract gravity, then the retraction force is sufficient, but the device complexity increases
Solution Approach 1:
The patent merges the spring-based force-assisting unit with the existing magnetic control mechanism into an integrated system. The spring unit is positioned to work in conjunction with the magnetic components, combining passive elastic force with active magnetic control. This merging allows the system to achieve sufficient retraction force while minimizing the increase in overall structural complexity through compact integration.
4Device complexity
If the magnetic control mechanism operates alone, then the device structure is simple, but it cannot provide sufficient force to overcome increasing gravity as slats overlap
Solution Approach 1:
The spring-based force-assisting unit provides continuous counterbalancing force that compensates for increasing gravitational load as slats overlap during retraction. This allows the magnetic control mechanism to operate efficiently without being overwhelmed by gravity, maintaining high retraction productivity while keeping the overall structure relatively simple through the addition of the spring assistance system.
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 solution allows for successful complete retraction and expansion of the blinds without falling, maintaining functionality by balancing gravitational force with spring-assisted resistance and controlled frictional forces.
Implementation Method 1
includes a spring capable of exerting a spring force on the control unit to resist the weight of the slats acting on the control unit. The spring force of the spring gradually increases when the blind unit is moved to the retracted state and gradually decreases when the blind unit is moved to the expanded state
Implementation Method 2
The brake unit is connected to the input shaft and generates a frictional force to resist rotation of the input shaft in the second rotational direction
Implementation Method 3
a slide block magnetically attracted to the iron plate and slidable up and down in the one of the frame plates
Data Source
AI summary
A window blind assembly includes a frame, an input shaft rotatably disposed in the frame, a blind unit, a winding unit for placing the blind unit in a retracted state when the input shaft is rotated in a first rotational direction and for shifting the blind unit to an expanded state when the input shaft is rotated in a second rotational direction, a control unit operable to drive rotation of the input shaft in the first and second rotational directions, a force-assisting unit having a spring capable of exerting a spring force on the control unit to resist the weight of the blind unit acting thereon, and a brake unit connected to the input shaft and generating a frictional force to resist rotation of the input shaft in the second rotational direction.