Dual Roller Blind Head Rail with Forward Cord Guides
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Solution Overview
Problem
Conventional window blinds face challenges in providing both privacy and varied light control while maintaining an aesthetically pleasing and compact design, as they often suffer from light leakage around cord loops and friction-induced damage between panels.
Innovation Solution
A blind system with a head rail featuring upper and lower rollers, where the upper blind is opaque and the lower blind is semi-translucent, with control mechanisms that allow for independent operation and minimal contact between panels, ensuring a slim profile and effective light exclusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single blind panel with cord loops is used, then the structure is simple, but light leakage occurs around the cord loops reducing privacy
Solution Approach 1:
The blind system is divided into two separate panels: a first blind panel and a second blind panel. Each panel operates independently on its own roller, allowing the light-blocking second panel to be positioned without cord loops that would create gaps. The segmentation enables one panel to fulfill the light exclusion function while the other provides operational control without compromising privacy.
Solution Approach 2:
The harmful element (cord loops creating light gaps) is extracted by separating the control mechanism from the light-blocking panel. The first panel serves as the operational panel with cords and controls, while the second panel serves exclusively as the light-blocking panel without any cord loops, thus eliminating the light leakage problem.
2Adaptability or versatility
If multiple blind panels are stored in the same head rail, then light control versatility is improved, but the head rail becomes larger and less aesthetically pleasing
Solution Approach 1:
The second blind panel is nested within the head rail structure, stored in a recess or compartment that is integrated into the head rail design. This nesting approach allows the second panel to be housed without significantly increasing the external dimensions of the head rail, maintaining aesthetic appearance while providing dual-panel functionality.
Solution Approach 2:
The head rail is designed with vertical stratification, placing the first roller in an upper region and the second roller in a lower region. This vertical arrangement optimizes space utilization within the head rail volume, allowing both panels to coexist without requiring excessive horizontal space, thus maintaining a compact and aesthetically pleasing profile.
3Ease of operation
If control cords hang beside blind panels, then operation is simple, but light leakage occurs and panel edges become damaged
Solution Approach 1:
Guide elements act as intermediaries between the control cords and the blind panels. These guides direct the cords to hang in a predetermined path that is forwardly disposed relative to the panel edges, preventing direct contact between cords and panels. This intermediary mechanism maintains ease of cord operation while eliminating the harmful effects of light leakage and edge damage.
Solution Approach 2:
The control cords are pre-positioned and guided along a predetermined path before they can contact the blind panels. The guide elements are installed in advance to establish the correct cord trajectory, ensuring that during normal operation the cords remain separated from the panel edges, thus preventing damage and light leakage before they can occur.
4Device complexity
If blind panels contact each other during adjustment, then the structure is compact, but friction causes damage to the panels
Solution Approach 1:
The two blind panels are positioned asymmetrically relative to each other, with the first panel and second panel offset in their vertical and horizontal arrangements. This asymmetric positioning ensures that during independent adjustment of each panel, their paths of motion do not intersect, eliminating friction and contact damage while maintaining a compact overall structure.
Data Source
AI summary
A blind for a building opening having a first blind roller located in an upper region of a head rail, a second blind roller located in a lower region of the head rail, a first blind stored on the first blind roller, a second blind stored on the second blind roller, a first blind control guided forwardly and operable to lower and raise said first blind, and a second blind control guided forwardly and operable to lower and raise said second blind.