Internal Winding Device for Window Screening
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Solution Overview
Problem
Conventional window screening arrangements with external winding reels are too wide to fit between window frame members, requiring narrower screening bodies and wider side rails, which are aesthetically undesirable and less effective at blocking light.
Innovation Solution
The winding reels are arranged mostly or fully inside a hollow rolling tube, allowing the screening body to maintain tension with guidance cords that apply force to a bottom bar, enabling the screening body to be as wide as the window frame while keeping the winding device compact and discrete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If winding reels are arranged externally on the rolling tube, then the winding device is structurally simple and easy to manufacture, but the screening arrangement becomes too wide to fit between window frame members
Solution Approach 1:
The winding reels are arranged inside the hollow rolling tube, nesting one component within another. This internal arrangement eliminates the external width addition while maintaining all functional capabilities of the winding mechanism.
2Length of stationary object
If the screening body is made narrower to fit between frame members with external winding reels, then the screening arrangement fits the window frame, but wider side rails are required which are aesthetically undesirable and less effective at blocking light
Solution Approach 1:
By nesting the winding reels inside the rolling tube, the screening body can extend fully across the window opening without width reduction, eliminating the need for wide side rails and maximizing light blocking effectiveness.
3Illumination intensity
If the screening body width is increased to match the window frame width, then light blocking effectiveness is improved, but the screening arrangement becomes too wide to fit between frame members with external winding reels
Solution Approach 1:
The winding reels are positioned inside the hollow rolling tube, allowing the screening body to achieve full window frame width for optimal light blocking without adding external width to the overall arrangement.
4Shape
If winding reels are placed inside the hollow rolling tube, then the aesthetic appeal is improved and the screening body can be wider, but the device complexity increases
Solution Approach 1:
The hollow rolling tube structure provides a natural housing for the winding reels, integrating them into the existing design. This nesting approach improves aesthetics by concealing the reels while utilizing the available internal space efficiently.
Solution Approach 2:
The hollow rolling tube serves dual purposes: it acts as the structural element that rolls the screening body while simultaneously housing the winding reels. This multi-functionality reduces overall device complexity despite the internal arrangement.
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 solution allows the screening body to cover the window effectively without visible winding reels, maintaining tension and blocking light while using a smaller motor, reducing power consumption and enhancing aesthetic appeal by minimizing the width of side rails.
Implementation Method 1
each at one end being connected to a winding device, said at least one guidance cord providing a force in the longitudinal direction on the bottom bar such that the screening body is kept tensioned
Implementation Method 2
said winding device comprising at least one winding reel for winding the at least one guidance cord when the screening body is moved to the screening position
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A screening arrangement (1) for screening of a window, said screening arrangement (1) comprising a screening body (9) having an upper first end and a lower second end, said screening body (9) being movable in a longitudinal direction between a non-screening position, in which the screening body (9) is rolled up, and a screening position, in which the screening body (9) is extended; a hollow rolling tube (3) adapted for being rotatable when mounted, said rolling tube (3) extending in a transverse direction perpendicular to the longitudinal direction and being connected to the first end of the screening body (9), such that the screening body (3) is rolled up around the rolling tube (3) in the non-screening position; a bottom bar (4) extending parallel with the rolling tube (3), said bottom bar (4) being connected to the second end of the screening body (9); and at least one guidance cord (5a, 5b), each in one end being connected to a winding device (2), said at least one guidance cord (5a, 5b) providing a force in the longitudinal direction on the bottom bar (4) such that the screening body (9) is kept tensioned between the rolling tube (3) and the bottom bar (4).