Window Shade Switchable Coupling Mechanism
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Solution Overview
Problem
Conventional window shades require the panel assembly to be lowered to its bottommost position before it can be opened for light passage, which is inconvenient for operation.
Innovation Solution
A window shade design featuring a reel coupled to a first control module, a panel assembly connected with the reel, a lift actuator coupled to a second control module, and a switchable coupling mechanism, allowing the panel assembly to be switched between open and closed states independently and at any desired height, with the coupling mechanism rotatingally coupling and uncoupling to facilitate operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the panel assembly is lowered to its bottommost position before opening, then the panel assembly can be opened for light passage, but the operation becomes inconvenient and time-consuming
Solution Approach 1:
The window shade system is divided into two independent functional modules: (1) a reel mechanism for raising and lowering the panel assembly, and (2) a lift actuator mechanism for opening and closing the panel assembly. This segmentation allows each module to perform its specific function independently, enabling the panel to be opened at any height without needing to be lowered first, thus resolving the contradiction between ease of operation and time loss
Solution Approach 2:
The coupling mechanism dynamically switches between coupled and uncoupled states based on operational needs. When uncoupled, the reel operates independently for vertical movement. When coupled, the lift actuator operates independently for opening/closing. This dynamic state switching enables flexible, independent control of both functions, eliminating the constraint that required the panel to be lowered before opening
2Adaptability or versatility
If a single control mechanism is used for both raising/lowering and opening/closing, then the device complexity is reduced, but the ability to independently control panel position and state is compromised
Solution Approach 1:
The control system is segmented into two independent control modules: a first control module operating the reel for vertical positioning, and a second control module operating the lift actuator for opening/closing. This segmentation provides full adaptability for independent control of panel position and state. The complexity is managed through modular design where each module is relatively simple, and they interact only through the coupling mechanism
Solution Approach 2:
The coupling mechanism serves as an intermediary element that selectively connects or disconnects the reel and lift actuator. This mediator allows the two control modules to operate independently when needed, or work together when needed, providing versatility without requiring a complex integrated control system. The coupling mechanism simplifies the overall control architecture by providing a clear on/off connection state
3Ease of operation
If the panel assembly can be opened at any height, then the ease of operation is improved, but the risk of improper operation increases
Solution Approach 1:
The coupling mechanism dynamically adjusts its state based on the operational phase: it remains uncoupled during vertical movement to prevent interference, and couples during opening/closing operations to ensure proper coordination. This dynamic behavior allows flexible opening at any height while preventing improper operation through state-dependent control
Solution Approach 2:
The system incorporates positional feedback mechanisms that detect the panel assembly's vertical position and the opening/closing state. This feedback information is used by the control modules to determine appropriate actions and prevent improper operations. The feedback ensures that opening operations can occur at any height while maintaining system reliability through intelligent control
Data Source
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AI summary
A window shade (100) includes a reel (128) coupled to a first control module (130) and connected with a panel assembly (104), a lift actuator (202) coupled to a second control module (204), and a switchable coupling mechanism (206). The panel assembly has an open state for light passage and a closed state blocking light passage. The first control module can drive the reel in rotation for winding and unwinding the panel assembly. The second control module can drive the lift actuator in rotation for switching the panel assembly to the open or closed state. The coupling mechanism has a coupling state in which it rotationally couples the lift actuator to the first control module, and an uncoupling state in which it rotationally uncouples the lift actuator from the first control module. The coupling mechanism is in the uncoupling state while the panel assembly is closed, and in the coupling state while the panel assembly is opened.