Extensible Screen Cord System for Variable Light Permeability
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Solution Overview
Problem
Existing window screening arrangements, such as roller blinds, are difficult to adjust for light intake and are not suitable for windows installed at angles or inclined roofs, as they rely on gravity and weight for tensioning, which limits their installation flexibility and control over light and heat permeability.
Innovation Solution
A screening arrangement with a cord system and spring device that provides pre-tensioning to maintain the extensible screen in a stretched state during unwinding, allowing for adjustable light and heat control, suitable for various window orientations, including inclined roofs, through a cord system with traction cords connected to a roller shaft and a spring device integrated into the bottom bar or side rails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a roller blind with fabric screen is used, then light intake can be adjusted by varying covering length, but the ability to control light permeability is limited and adjustment is difficult
Solution Approach 1:
The patent applies parameter changes by transforming the screen material from a static fabric to an extensible material with variable aperture size. The apertures can be dynamically adjusted between open and closed states, changing the optical parameters of the screen to control light permeability directly rather than just adjusting covering length.
Solution Approach 2:
The screening arrangement introduces dynamic control through motor-driven mechanisms that can open and close the apertures in the extensible screen. This allows real-time adjustment of light permeability during operation, transforming a static blind into a dynamically controllable screening system.
2Force
If gravity-based tensioning is used in roller blinds, then the screen can be tensioned, but the arrangement is unsuitable for inclined roofs and horizontal windows
Solution Approach 1:
The patent replaces gravity-based tensioning with an active tensioning system that uses motor-driven rollers to apply controlled force to the extensible screen. This counteracts the limitation of gravity-dependent systems, allowing the screen to be properly tensioned in any orientation including inclined roofs and horizontal windows.
Solution Approach 2:
The invention substitutes the passive mechanical gravity-based tensioning system with an active electromechanical tensioning system. The motor-driven rollers provide controlled tensioning force that is not dependent on gravitational direction, enabling versatile installation in various orientations.
3Illumination intensity
If an extensible screen with variable aperture is used, then light permeability control is improved, but the screen requires continuous tensioning to maintain stretched state
Solution Approach 1:
The patent implements continuous tensioning through the motor-driven roller system that maintains constant force application to the extensible screen. This ensures the screen remains in a stretched state with controlled apertures throughout operation, preventing slack and maintaining optimal optical performance continuously.
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
Enables improved control over light and heat permeability in a wide range of window installations, including inclined roofs, by maintaining tension in the screen and accommodating surplus cord length, ensuring proper functioning and adjustable light intake.
Implementation Method 1
a spring device (5) to provide pre-tensioning of the at least one traction cord (3)
Data Source
Figure 1
Figure 1a
Figure 2
AI summary
The screening arrangement (100) provides for adjustment of the light intake of a window, by providing an extensible screen (6) with variable permeability such that when traction is applied, the permeability of the material is increased. A roller shaft (1) is connected to drive means and traction means are provided to apply a traction force on the extensible screen (6) to bring the extensible screen (6) to a first stretched state in which the permeability of the material is increased, corresponding to a first screening position. From the first screening position, the extensible screen (6) is brought to a second screening position in which the extensible screen (6) is in a second stretched state by continued rotation of the roller shaft (1) in the unwinding direction. The permeability of the extensible screen (6) is decreased in the second stretched state relative to the first stretched state. According to the invention, the traction means comprises a cord system including at least one traction cord (3) in connection with the roller shaft (1) and the extensible screen (6). A spring device (5) provides pretensioning of the traction cord (3), the cord system being configured to apply a traction force on the extensible screen (6) such that the tension exerted by the cord system on the extensible screen (6) provides said first stretched state during unwinding of the extensible screen (6).