Roller Shade Assembly With Side Drive and Self-Adjusting Bottom Bar
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Solution Overview
Problem
Roller shades face challenges such as the need to minimize space for mechanical components between the roller tube and the window opening, preventing 'telescoping' of the fabric, and eliminating gaps at the bottom of the window opening due to angled sills or improper fabric cuts.
Innovation Solution
The roller shade assembly features a compact frame design with a drive assembly attached to the side of the cover, a fabric retaining assembly with a press bar to prevent telescoping, and a self-adjusting bottom bar with a weight retained in a channel to minimize gaps at the bottom of the window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If chain drive assemblies are attached to one end of the roller tube, then the roller shade can be operated, but space is required between the end of the roller tube and the adjacent side of the window opening
Solution Approach 1:
The drive assembly is merged with the frame structure rather than being attached to the roller tube end. The housing is attached to the frame and contains the drive mechanism, integrating the operational components into the overall frame assembly, thereby eliminating the need for additional space between the roller tube and window opening.
Solution Approach 2:
The drive assembly is repositioned from a linear extension at the end of the roller tube to a side-mounted configuration within the frame. This spatial reconfiguration moves the drive mechanism to a different dimension (side attachment vs. end attachment), allowing the roller tube to extend closer to the window opening while maintaining operational functionality.
2Area of stationary object
If fabric is wound on the roller tube, then the roller shade covers the window, but telescoping occurs due to misalignment of fabric layers
Solution Approach 1:
A fabric guide is introduced as an intermediary component between the fabric and the roller tube. The guide maintains proper alignment of the fabric as it is wound onto the roller, preventing misalignment of successive layers and telescoping while allowing full window coverage.
Solution Approach 2:
The fabric guide pre-establishes the correct positioning and alignment of the fabric before it is wound onto the roller tube. This preliminary alignment action ensures that each layer of fabric is properly positioned relative to the previous layer, preventing telescoping from occurring during the winding process.
3Area of stationary object
If fabric is cut to fit the window opening, then coverage is achieved, but gaps occur at the bottom due to angled window sills or improper cutting
Solution Approach 1:
The bottom bar is made adjustable rather than fixed, allowing it to be repositioned to accommodate angled window sills. This dynamic adjustment capability enables the bottom bar to maintain contact with the window sill at various angles, eliminating gaps without requiring precise fabric cutting.
Solution Approach 2:
The position and angle of the bottom bar can be changed to adapt to different window sill configurations. By adjusting the bottom bar's parameters (position, angle), the system compensates for variations in window opening geometry, eliminating gaps without requiring precise fabric cutting.
4Device complexity
If mechanical components are positioned between the roller tube and window opening, then the roller shade structure is complete, but unwanted gaps are created along the sides of the window opening
Solution Approach 1:
The drive assembly is merged with the frame structure and positioned at the side of the frame rather than between the roller tube and window opening. This integration eliminates the need for separate mounting brackets and hardware that would create gaps, while maintaining complete structural functionality.
Solution Approach 2:
The drive assembly is extracted from the space between the roller tube and window opening and relocated to the side of the frame. This removal of the mechanical component from the critical gap area eliminates unwanted spaces along the sides of the window opening while the drive functionality is preserved in the relocated position.
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 minimizes unwanted gaps along the sides and bottom of the window opening, enhances fabric alignment to prevent telescoping, and allows for precise adjustment to fit various window configurations, improving the roller shade's effectiveness in blocking light.
Implementation Method 1
a free end having a weight attached thereto
Data Source
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AI summary
A roller shade assembly, installed in a window opening, having a frame with opposing first and second ends attached within the window opening. A roller is rotatably mounted to the frame with opposing ends, a rotational axis, and a first gear coaxially attached to one end of the roller. A drive assembly is attached to the frame between the first and second ends, having a second gear that is selectively rotatable and is operatively engaged with the first gear for imparting rotational motion from the drive assembly to the roller.