Roller Shade Clutch and Slide Lock for Torque and Unrolling Control
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Solution Overview
Problem
Roller shade systems face issues with component damage due to excessive force, chain breakage, and uncontrolled rotation, particularly when users pull the shade too quickly, leading to torque exertion on the sprocket and chain, and multi-banded systems experience unrolling when individual shades are removed for maintenance.
Innovation Solution
The introduction of a slip plate with protrusions that engage with slots in the brake hub to allow controlled rotation, tube adapters made of dampening material to absorb torque, and a slide lock mechanism to prevent unrolling in multi-banded systems, along with a center-drive mechanism and adjustable components for alignment and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If users pull the shade quickly, then the shade can be raised or lowered faster, but excessive torque is exerted on the sprocket and chain causing component damage
Solution Approach 1:
The patent introduces a friction disk and friction pad system that provides beforehand cushioning against excessive torque. The friction pad is positioned to contact the friction disk when abnormal force is applied, creating friction-based resistance that cushions and limits the torque transmitted to the sprocket and chain, preventing component damage while allowing normal operation speed
Solution Approach 2:
The patent converts the harmful effect of excessive pulling force into a beneficial friction-based control mechanism. The friction between the friction pad and friction disk transforms the harmful excessive torque into a controlled frictional resistance that protects the drive mechanism, turning potential damage into a protective feature
2Ease of repair
If a multi-banded shade system allows individual shade removal for maintenance, then maintenance accessibility is improved, but the shade may unroll uncontrollably when removed
Solution Approach 1:
The patent extracts the locking function from the main clutch mechanism and implements it as a separate slide lock mechanism. This independent lock can be engaged or disengaged without removing the entire clutch assembly, allowing individual shade bands to be removed for maintenance while the lock prevents unrolling by independently constraining the shade position
Solution Approach 2:
The slide lock acts as an intermediary mechanism between the shade band and the drive mechanism. It provides a separate control path that maintains stability during maintenance operations, mediating between the need for easy removal and the need to prevent uncontrolled unrolling
3Ease of operation
If the clutch mechanism is designed to allow free rotation for shade operation, then ease of operation is improved, but uncontrolled rotation and damage from excessive force occurs
Solution Approach 1:
The patent implements dynamic control by combining the wrap spring clutch mechanism with the friction-based safety system. The wrap spring allows free rotation during normal operation for ease of use, while the friction pad and disk provide dynamic resistance that activates only when excessive force is applied, maintaining reliability without compromising operational smoothness
Solution Approach 2:
The patent changes the friction parameter of the drive system by introducing adjustable friction elements. The friction pad can be positioned at different distances from the friction disk, allowing adjustment of the friction force threshold. This enables the system to maintain smooth operation under normal conditions while providing controlled resistance against excessive force
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 slip plate minimizes damage to clutch components, tube adapters prevent chain breakage, and the slide lock ensures stable operation during shade removal, while the center-drive mechanism and adjustable components enhance usability and alignment, providing increased safety and support.
Implementation Method 1
a drive hub having a tube adapter comprised of dampening material, wherein the drive hub engages with at least one of a shade tube or a brake hub
Data Source
AI summary
An improved roller shade system provides increased support, additional adjustments and/or increased safety. The slip plate allows the brake to slip forward and minimize damage to the clutch spring when a user pulls too hard on the hembar. The center drive mechanism extends through a bracket to allow the drive shaft to distribute power in both directions and drive two shade tube simultaneously. The tube adapter absorbs force from the spinning shade tube to minimize damage to the other components and the bead chain. The sprocket has a back wall supporting the sprocket, allowing the sprocket 130 to rest on the back flange of the sun gear to minimize pressure on the gears. An adjustment arm is adjusted to help level the shade band. The shade bands may be removed without disturbing the other shade bands in the system. A height of a hembar may be adjusted by rotating a rod within the hembar.