Roll-Up Screen Rail Member Slit Width Control
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Solution Overview
Problem
Conventional roll-up type screen apparatuses face challenges in maintaining the fitter member within the guider due to the need for an extremely narrow slit, which is difficult to produce, leading to potential disengagement of the fitter member during the rolling process.
Innovation Solution
The screen apparatus incorporates a rail member with a first slit and a retainer member, where the rail member is compressively deformed to narrow the slit width, allowing the fitter member to be securely accommodated without requiring an extremely narrow slit in the production process, utilizing a retainer member to maintain the rail member in a second chamber and adjust the slit width to be narrower than the fitter member's thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of the fitter member is set to be small to reduce the wound-diameter of the net and fitter member on the roll-up shaft, then the wound-diameter is reduced, but the fitter member may pass through the slit and come off the guider
Solution Approach 1:
The patent applies the dynamics principle by making the slit width variable rather than fixed. The slit is designed to be wide during the assembly process to facilitate easy insertion of the fitter member, and then narrowed during the rolling process to secure the fitter member and prevent it from passing through. This dynamic adjustment of the slit width resolves the contradiction between allowing small-thickness fitter members (for reduced wound-diameter) and preventing them from passing through (for reliability).
2Reliability
If the width of the slit is set to be extremely narrow to prevent the fitter member from passing through, then the engagement reliability is improved, but it becomes difficult to form the slit in the guider during production
Solution Approach 1:
The patent applies the preliminary action principle by designing the slit to be wide during the assembly phase, allowing easy formation and insertion operations. The narrowing of the slit to secure the fitter member occurs subsequently during the rolling process, not during the difficult production phase. This temporal separation of functions resolves the contradiction between easy manufacture (wide slit during assembly) and reliability (narrow slit during operation).
3Reliability
If the thickness of the fitter member is set to be large to prevent passing through the slit, then the engagement reliability is improved, but the wound-diameter of the net and fitter member on the roll-up shaft increases
Solution Approach 1:
The patent resolves this contradiction by dynamically adjusting the slit width rather than relying on a fixed fitter member thickness. The slit is wide during assembly to accommodate fitter members of any thickness, then narrowed during rolling to secure them. This eliminates the need to increase fitter member thickness, thereby maintaining small wound-diameter while ensuring reliability through the dynamic slit mechanism.
4Reliability
If an extremely narrow slit is formed in the guider during production, then the fitter member engagement is secured, but the production process becomes difficult and complex
Solution Approach 1:
The patent applies preliminary action by designing the slit to be wide during the simple assembly phase, making the production process easy. The narrowing action is deferred to the rolling phase, where it serves a dual purpose: securing the fitter member and preparing the guider for its final function. This temporal sequencing resolves the contradiction between reliability and production complexity.
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
This configuration ensures the fitter member remains engaged, simplifies the production process by avoiding the need for extremely narrow slit formation, and allows for easy molding of the rail member, preventing disengagement and facilitating efficient rolling of the screen.
Implementation Method 1
the rail member is compressively deformed in a width direction of the slit by the retainer member
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Included are: a screen member 33: a fitter member 35 attached to a side end 33a of the screen member 33; a rail member 91 having a first chamber 91a and a first slit 91b joining the first chamber 91a, the first chamber 91a accommodating the side end 33a of the screen member 33 and the fitter member 35 passing through the first slit 91b to thereby allow the rail member 91 to hold the screen member 33 movably in a longitudinal direction of the first slit 91b; and a retainer 93 for retaining the rail member 91. The rail member 91 is compressively deformed in the width direction of the first slit 91b by the retainer 93, and the width of the first slit of the compressively deformed rail member 91 is narrower than the thickness T1 of the fitter member 35.