Roller Tube Coupling With Spring Clips for Smooth-Bore Rotation
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Solution Overview
Problem
Large windows require oversized roller shades with smooth inner roller tubes, which traditional drive assemblies cannot rotate effectively due to the lack of splines, leading to manufacturing complexity and operational challenges.
Innovation Solution
A coupling assembly with compliant members, such as u-shaped spring clips, that protrude from its outer surface to apply compressive force to the inner surface of the roller tube, enabling a rigid connection without fasteners and allowing rotation, even on smooth surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a smooth inner surface roller tube is used, then manufacturing complexity is reduced, but the drive assembly cannot rotate the roller tube effectively
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 drive interface features that engage with the drive assembly and transmit rotational force to the roller tube, enabling rotation without requiring splines or grooves on the roller tube itself.
Solution Approach 2:
The drive interface features are positioned at specific locations around the coupling assembly's circumference, creating a multi-point engagement system. This dimensional arrangement allows effective torque transmission while maintaining a smooth roller tube surface.
2Stability of the object's composition
If a rigid connection is created between the coupling assembly and roller tube, then rotational stability is improved, but the connection requires fasteners increasing complexity
Solution Approach 1:
The coupling assembly employs spring clips with elastic compliant members that dynamically adapt to the roller tube surface. The compliant members deflect and apply distributed compressive forces, creating a stable rigid connection through elastic deformation rather than mechanical fasteners.
Solution Approach 2:
The spring clips utilize elastic properties of materials to transform static compression into dynamic force application. The compliant members' elasticity allows them to conform to surface variations while maintaining consistent contact pressure for stable rotation.
3Device complexity
If spring clips with compliant members are used, then a fastenerless rigid connection is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The spring clip design incorporates geometric parameters such as clip thickness, leg length, and curvature radii that are optimized to provide sufficient compliance while maintaining manufacturing feasibility. These parameters are selected to balance the need for precision with standard manufacturing capabilities.
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
Enables the rotation of roller tubes with smooth inner surfaces, facilitating the operation of large window treatments by creating a secure, non-clutch connection, thus addressing the challenge of oversized window coverage.
Implementation Method 1
The plurality of compliant members may be u-shaped spring clips. The spring clips may define a base and one or more compliant members that extends from the base.
Implementation Method 2
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.