Linear Guide Mechanism for Retractable Screen Parallel Movement
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Solution Overview
Problem
Existing retractable screens face complexity in assembly and adjustment due to intricate cable mechanisms, making them expensive and difficult to manufacture and adjust, especially when cut, requiring re-adjustment of multiple mechanisms.
Innovation Solution
A device with linearly arranged mechanical elements, featuring two vertical rigid elements with a mobile element guided by lower and upper flexible elements connected to an intermediate flexible element that slides along vertical rails, allowing for easy size adjustment by cutting and re-adjusting at a single point, ensuring parallel movement without complex cable systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex cable mechanisms are used to maintain parallel movement between fixed and mobile parts, then the screen can function properly, but the assembly becomes complicated and expensive
Solution Approach 1:
The patent extracts the complex cable mechanism from the system and replaces it with a simplified guide structure. The mobile element is guided directly by guides attached to the fixed element, eliminating the need for complex cables while maintaining parallel movement through geometric constraints.
Solution Approach 2:
The patent introduces guides as intermediary elements between the fixed and mobile parts. These guides serve as mediators that constrain the mobile element's movement path, ensuring parallel motion without requiring complex cable systems.
2Reliability
If complex cable mechanisms are used, then the screen can be manufactured, but the assembly and adjustment processes become time-consuming and expensive
Solution Approach 1:
The complex cable assembly process is extracted and replaced with a simpler guide attachment process. The guides are directly attached to the fixed element, eliminating multiple cable connection steps and reducing assembly time and cost.
Solution Approach 2:
The patent changes the structural parameters of the guiding system from flexible cables to rigid guides with fixed geometry. This parameter change simplifies the manufacturing process while maintaining the functional requirement of parallel movement.
3Adaptability or versatility
If the device is cut to adjust size, then it can adapt to different openings, but multiple mechanisms must be readjusted
Solution Approach 1:
The guides are designed as universal components that can accommodate different screen lengths. The guides remain attached to the fixed element and provide consistent guidance regardless of the mobile element's position, eliminating the need to readjust multiple mechanisms when resizing.
Solution Approach 2:
The patent segments the screen system into fixed guides and a mobile element that can be independently adjusted. This segmentation allows the mobile element to be cut and repositioned without affecting the fixed guide structure, simplifying the resizing process.
Data Source
Figure 1
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Figure 3~5
AI summary
Device for guiding a fabric, especially designed to be used with retractable screens like for example pleaded anti-mosquito screens, which includes two vertical rigid elements facing each other, one of them fixed (2) and the other one mobile (1) and the latter being able to slide from a starting position where it is in contact with the fixed element or near this fixed element, to a final position, moving farther away from the fixed element. The mechanism that allows opening the screen also includes the upper flexible element (4), which is connected to the fixed part (2) and an intermediate flexible element (5) that is in turn connected to a lower flexible element (6) that attaches to the fixed element (2). The mechanism is linear, which simplifies the assembling of the device. It also easily adapts to openings of different sizes, which are to be protected with the retractable screen.