Retractable Screen Assembly With External Pull-Line Adjustment
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Solution Overview
Problem
Existing hidden screens face issues with inconvenient adjustment due to internal pull line mechanisms, require tools for assembly and maintenance, and struggle with large rolling forces leading to light leakage and insect entry.
Innovation Solution
The mechanism is redesigned to adjust pull lines externally, use convex ribs and embedding grooves for tool-free assembly, and incorporate a positioning bar to prevent frame skewing and detachable mounting for easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pull line adjusting and controlling apparatus is mounted on the inner side of the frame body, then the screen structure can be compact, but the adjustment operation is hindered by the screen or movable frame causing inconvenient adjustment
Solution Approach 1:
The pull line adjusting and controlling apparatus is relocated from the inner side to the outer side of the frame body, inverting the conventional mounting position. This allows the adjusting mechanism to be accessible from outside the screen structure, eliminating the need to reach inside the frame and enabling convenient adjustment operations even for large-width screens.
2Productivity
If pneumatic or electric tools are used for assembling the frame material, then the assembly can be completed efficiently, but the project is impeded in environments where electric or inflatable devices are not supplied
Solution Approach 1:
The frame material incorporates self-service assembly features including positioning structures and snap-fit connections that enable tool-free assembly. The frame members have integrated positioning grooves and protrusions that automatically align and secure components together without requiring external tools, making the system adaptable to any environment regardless of power availability.
3Strength
If the cylinder body of the rolling bar is assembled on the outer frame by means of bolts, then the connection is secure, but disassembling requires unscrewing components with a tool increasing human cost and inconvenience
Solution Approach 1:
The fastening mechanism extracts the need for threaded fasteners by using a snap-fit connection system. The cylinder body incorporates engagement protrusions that mate with corresponding recesses in the outer frame, secured by spring-loaded latches or elastic deformation. This allows the cylinder body to be firmly attached during operation yet easily removed by simple manual manipulation without tools.
4Force
If a rolling bar with large rolling force is configured for large-width screens, then the screen can be rolled up, but the unfolded screen moves causing light leakage and reduced shielding
Solution Approach 1:
The system applies preliminary anti-action by incorporating a counterbalancing mechanism or friction control system that opposes the rolling force. The rolling bar includes an adjustable friction brake or spring-loaded roller that provides a counteracting force to prevent the screen from moving when rolled up, thereby maintaining screen position stability and preventing light leakage while still allowing controlled rolling operation.
Data Source
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AI summary
A screen device includes a cylinder body, a movable frame and two first frame materials, wherein the cylinder body and the movable frame are disposed between the two first frame materials, and a rolling bar is disposed in the cylinder body; a screen is disposed between the rolling bar and the movable frame, and at least one rotating member is disposed in the cylinder body; at least one pull line penetrates the movable frame, and at least one end of the pull line penetrates the first frame material to extend into the cylinder body, and is then combined to the rotating member; the rotating member is disposed on a side portion of the cylinder body, and therefore, the rotating member can be adjusted and controlled only by using a tool on the side portion of the cylinder body, so as to adjust and control the tightness of the pull line when needed. The process thereof is completely free from blockages caused by any component, and adjustment and control is really convenient.