Asymmetric Bottom Rail for Double Panel Window Shading
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Solution Overview
Problem
Existing double-panel window shading systems face challenges with continuous downward tension from the bottom rail, which affects light transmission and can cause gaps between vanes, especially when the system is in a closed position, leading to unwanted light passage.
Innovation Solution
A bottom rail design with a weight distribution that positions the center of gravity closer to the first connection point, allowing the second connection point to rotate and eliminate tension on the second panel in the closed position, ensuring vanes are vertically aligned and preventing light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bottom rail applies continuous downward tension to both panels, then the structure is supported and panels are maintained in smooth planes, but gaps form between vanes in closed position allowing unwanted light transmission
Solution Approach 1:
The bottom rail is divided into two separate connection points (first connection point and second connection point) that can independently apply tension to each panel. This segmentation allows the first connection point to maintain tension on the first panel while the second connection point can be released in closed position, enabling precise control over vane alignment and eliminating gaps between vanes.
Solution Approach 2:
The bottom rail transitions from a static continuous tension system to a dynamic system where the second connection point can rotate and change its tension state. In open position, both connection points apply downward tension; in closed position, the second connection point rotates to eliminate tension on the second panel, allowing vanes to align vertically without gaps.
2Reliability
If the bottom rail maintains continuous downward tension on the second panel, then the panel remains stable, but the vanes cannot achieve vertical alignment for complete light blockage
Solution Approach 1:
The second connection point is designed to rotate between two states: applying downward tension in open position for panel stability, and releasing tension in closed position to enable vertical vane alignment. This dynamic adjustment resolves the contradiction between maintaining panel stability and achieving complete light blockage.
3Ease of operation
If the center of gravity is positioned between the first and second connection points, then downward tension is distributed to both panels, but gaps form between vanes preventing effective light blocking
Solution Approach 1:
The bottom rail employs asymmetric weight distribution with the center of gravity positioned closer to the first connection point than the second. This asymmetric positioning creates unequal tension distribution that, when combined with the rotatable second connection point, enables the second panel to be tensioned in open position and released in closed position, achieving both operational balance and effective light blocking.
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 design effectively reduces or eliminates gaps between vanes in the closed position, enhancing light blocking and improving the operational ease of the window shading system by adjusting the tensile forces applied to each panel.
Implementation Method 1
a weight distribution of the body causes a center of gravity of the bottom rail to be closer to the first connection point than the second connection point
Data Source
AI summary
Aspects of the present disclosure include a bottom rail for a double panel window shading having opposing first and second panels coupled by a plurality of vanes. The bottom rail may include a body, a first connection point on the body coupled to the first panel, and a second connection point on the body coupled to the second panel. A weight distribution of the body may cause a center of gravity of the bottom rail to be on a side of a plane through the first connection point and the second connection point opposing the body. The bottom rail is adjustable between an open position in which the first and second connection points exert downward tensile force on the respective panels, and a closed position in which the first connection point solely exerts downward tensile force on the first panel without the second connection point exerting downward tensile force on the second panel.