Retractable Window Screen with Spindle and Pulley Mechanism
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Solution Overview
Problem
Existing screen systems for windows and doors often obstruct views, require separate installation, and complicate maintenance by covering part of the opening, necessitating a more integrated and accessible solution that allows the screen to move with the panel.
Innovation Solution
A screen system with a roller assembly and spindle mechanism that winds and unwinds the screen as the sliding panel opens and closes, using a tension adjustment arrangement and pulley system to ensure smooth operation and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a screen is permanently installed in a frame mounted to the window, then the screen provides insect protection and ventilation, but the view is obstructed and access for cleaning or maintenance is restricted
Solution Approach 1:
The screen is made dynamic by attaching it to a roller assembly that can wind and unwind the screen material. The screen transitions from a static permanently installed state to a dynamic retractable state, allowing it to be moved out of the way for cleaning access and then returned to its protective position.
Solution Approach 2:
The screen is extracted from the traditional fixed frame mounting and repositioned to be attached to the sliding panel. This allows the screen to be taken out of the permanent installation configuration and integrated with the moving panel mechanism instead.
2Reliability
If a screen is permanently installed in a frame mounted to the window, then the screen provides insect protection, but the view through the window is obstructed
Solution Approach 1:
The screen becomes a dynamic element that can be repositioned based on usage needs. When the sliding panel is closed, the screen is wound onto the roller assembly and positioned at the side, clearing the window opening for unobstructed views. When the panel is open, the screen unwinds to provide insect protection.
Solution Approach 2:
The roller assembly acts as an intermediary mechanism between the screen and the window frame, allowing the screen to be positioned in two locations: wound at the side for clear views, or unwound across the opening for insect protection.
3Reliability
If a second sliding door with screen is used, then the screen provides insect protection, but the device complexity and maintenance requirements increase
Solution Approach 1:
The screen function is merged with the existing sliding panel mechanism. Instead of requiring a separate second door, the screen is integrated into the single sliding panel by attaching it to the panel's edge and using the panel's movement to drive the screen's deployment and retraction.
Solution Approach 2:
The sliding panel serves multiple functions: it provides the primary opening/closing function, and simultaneously acts as the mounting mechanism for the screen. The screen attachment to the panel's first edge allows the panel to control both its own movement and the screen's deployment, eliminating the need for a separate door.
4Reliability
If the screen is wound onto a spindle as the panel opens, then the screen provides protection when open, but the mechanism complexity increases
Solution Approach 1:
The screen winding mechanism is self-service, using the movement of the sliding panel itself to drive the screen's deployment and retraction. The panel's movement directly causes the screen to unwind when opening and wind when closing, eliminating the need for separate motors, springs, or complex actuation mechanisms.
Solution Approach 2:
The roller assembly acts as a simple intermediary mechanism that converts the linear movement of the sliding panel into the rotational winding action needed for the screen. This simple roller-and-screen attachment mechanism avoids complex winding systems while achieving the desired screen deployment.
Data Source
AI summary
A screen system for use with a sliding panel of a window or door to screen an opening as the sliding panel or door is opened. The screen is attached to the edge of the sliding panel adjacent the opening, and is wound onto a spindle. The spindle is rotatably mounted adjacent the screen opening so that the screen can be unwound from or wound onto the spindle. A cord is connected between the sliding panel and the spindle pulley via an idler pulley. The spindle is caused to rotate to wind the screen onto the spindle as the sliding panel is slid towards the closed position. While the screen is wound off the spindle, the cord is wound onto the spindle pulley and vice versa. A tension adjustment arrangement is provided for adjusting the tension in the cable as the screen is wound and unwound from the spindle.