Worm-Driven Louvered Canopy Linkage for Low-Force Actuation
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Solution Overview
Problem
Existing louvered canopy designs face issues with complex multi-gear-set transmissions that lead to significant backlash, precision loss, and high wear and tear, requiring substantial force for operation.
Innovation Solution
A louvered canopy design utilizing a combination of a worm-driven bar, control bar, and louver blade directional switching element, interconnected through hinged connections, transforming vertical motion into horizontal motion, eliminating backlash and simplifying the structure, with a triangular lever-like arrangement for enhanced precision and reduced wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a multi-gear-set transmission is used to control louver blade opening and closing, then the structure can convert rotary or vertical motion into horizontal motion, but the cumulative backlash among multiple gear sets causes significant precision loss and structural complexity
Solution Approach 1:
The patent extracts and eliminates the intermediate gear sets from the transmission system, retaining only the essential worm gear-worm wheel mechanism. This removal of unnecessary components directly addresses the cumulative backlash problem while maintaining the core motion conversion function from vertical to horizontal movement of the louver blades.
Solution Approach 2:
The transmission mechanism is segmented into distinct functional components: the worm gear for motion conversion, the worm wheel for amplification, and the linkage bar for direct transmission. This segmentation allows each component to perform its specific function efficiently without the interference of multiple gear interfaces, thereby eliminating cumulative backlash.
2Ease of operation
If a worm gearbox with flexible shaft is used for manual control, then the louver blades can be controlled manually, but the flexible shaft is subject to high wear and tear leading to fatigue damage and operational inconvenience
Solution Approach 1:
The flexible shaft is completely extracted and removed from the transmission system. Instead of using a flexible shaft to connect the worm gear to the linkage bar, the patent employs a rigid worm-driven bar that directly transmits motion from the worm wheel to the linkage bar, eliminating the wear and fatigue issues associated with flexible shafts.
Solution Approach 2:
The worm-driven bar serves as an intermediary component that directly connects the worm wheel to the linkage bar. This rigid intermediary eliminates the need for flexible connections, providing a durable and maintenance-free transmission path while preserving manual control capability.
3Ease of operation
If a long transmission stroke is required to operate the louver blades, then the louver blades can be opened and closed, but a substantial amount of force is required to operate the mechanism
Solution Approach 1:
The patent employs a dynamic linkage mechanism where the linkage bar can swing through a limited arc. This dynamic motion, combined with the mechanical advantage from the worm gear-worm wheel system, allows the louver blades to be actuated with minimal force while achieving the required opening and closing range.
Solution Approach 2:
The transmission mechanism utilizes angular motion in a different dimension (rotational swing of the linkage bar) to achieve the linear displacement needed for louver blade actuation. This dimensional transformation, combined with the compact worm gear design, reduces the required operational force while maintaining effective stroke.
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 design achieves stable, precise, and convenient operation with reduced wear and tear, ensuring a long service life by simplifying the transmission mechanism and minimizing the required operational force.
Implementation Method 1
a worm gear, and a worm-driven bar, the worm gear being rotationally provided on the vertical column and meshing with the worm wheel
Implementation Method 2
the worm gear being rotationally provided on the vertical column and meshing with the worm wheel, a first end of the worm-driven bar being fixed to the worm wheel while a second end of the worm-driven bar being hinged to a lower end of the control bar
Implementation Method 3
the louver blade directional switching element comprises a hinged lever member and a fulcrum member, a first end of the fulcrum member being fixed to a middle part of the hinged lever member, while a second end of the fulcrum member being hinged to the frame
Implementation Method 4
interconnected through hinged connections, transforming vertical motion into horizontal motion
Data Source
AI summary
The present louvered canopy includes a louver blade directional switching element and a control bar. The control bar is vertically provided and inserted inside a vertical column of the louvered canopy and capable of swinging. The louver blade directional switching element includes a hinged lever member and a fulcrum member, a first end of the fulcrum member being fixed to a middle part of the hinged lever member, while a second end of the fulcrum member being hinged to a frame of the louvered canopy. The hinged lever member has an effort end and a load end, the effort end being located below the load end, and the effort end and the load end being located on opposite sides of the fulcrum member, respectively, the effort end being hinged to the control bar, while the load end being connected to the louver blades through a linkage transmission mechanism.