Roller Tube Coupling With Spring Clips for Smooth Inner Surfaces
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Solution Overview
Problem
Large windows require correspondingly large window treatments, such as roller shades, which pose challenges in manufacturing and operation, especially when the roller tube has a smooth inner surface, making it difficult for drive assembly components to rotate the tube effectively.
Innovation Solution
A coupling assembly with compliant members, such as u-shaped spring clips, is designed to operatively engage the roller tube, applying a compressive force to the inner surface and preventing relative rotation, thus enabling a rigid connection without fasteners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the roller tube has a smooth inner surface to reduce manufacturing complexity, then manufacturing complexity is reduced, but the drive assembly components cannot effectively rotate the tube
Solution Approach 1:
A coupling assembly is introduced as an intermediary component between the drive assembly and the smooth roller tube. The coupling assembly includes engagement members with gripping surfaces that interface with the smooth outer surface of the roller tube, while the drive assembly interfaces with the coupling assembly through drive engagement features. This mediator enables rotation of the smooth roller tube without requiring modifications to the tube itself.
Solution Approach 2:
The coupling assembly changes the interface parameters between the drive system and roller tube. Instead of relying on surface roughness or splines on the roller tube, the system uses compliant engagement members with gripping surfaces that can adapt to the smooth outer surface, transforming the interaction mechanism from direct mechanical interlocking to friction-based gripping with mechanical advantage.
2Area of stationary object
If the roller tube is made larger to cover wide windows, then coverage area is increased, but the tube becomes harder to rotate and operate
Solution Approach 1:
The drive system is segmented into distinct functional components: the drive assembly, the coupling assembly, and the roller tube. The coupling assembly acts as an intermediate segment that provides mechanical advantage through its lever arm and engagement members, enabling effective rotation of large-diameter tubes that would be difficult to rotate directly.
3Ease of manufacture
If compliant members are used to create a rigid connection without fasteners, then connection simplicity is improved, but the complexity of the coupling assembly increases
Solution Approach 1:
The coupling assembly uses compliant engagement members made of flexible material that can elastically deform to engage with the roller tube surface. These flexible members provide both the connection function and the necessary compliance to accommodate manufacturing tolerances and installation variations, eliminating the need for fasteners while maintaining a relatively simple overall structure.
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
The coupling assembly effectively allows the roller tube to rotate in conjunction with the drive assembly, ensuring smooth operation of the window treatment, even with a smooth roller tube surface, thereby addressing the challenges of large window treatments.
Implementation Method 1
The plurality of compliant members may protrude from an outer surface of the coupling assembly. The distal ends of the plurality of compliant members may define tips that are configured to abut the inner surface of the roller tube. The tips of the compliant members may apply a compressive force to the inner surface of the roller tube such that relative rotation of the coupling assembly with respect to the roller tube is prevented.
Data Source
AI summary
A coupling for a roller tube of a window treatment system may include a body and/or one or more compliant members. The body may include a bore through a rotational axis of the coupling. The body may be configured to be received within the roller tube of the window treatment system. The body may define an outer surface. One or more compliant members may extend at an oblique angle from the outer surface of the coupling. The one or more compliant members may be configured to engage a smooth inner surface of the roller tube. The use of compliant members may enable a rigid connection of the coupling to the smooth inner surface of the roller tube surface, without the use of fasteners.