Adjustable Hembar Mechanism for Leveling and Overload Protection
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Solution Overview
Problem
Roller shade systems face issues with damage from excessive force, chain breakage due to momentum, and uncontrolled unrolling in multi-banded systems, as well as alignment challenges and accessibility problems.
Innovation Solution
The system incorporates a slip plate with protrusions for controlled rotation, tube adapters for torque absorption, a slide lock for shade band management, and a center-drive mechanism for improved accessibility and alignment, along with an adjustment arm for leveling and a hembar adjustment mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional roller shade system uses a clutch mechanism with wrap spring, then the shade can be raised and lowered, but the system is vulnerable to damage from excessive force and chain breakage due to momentum
Solution Approach 1:
A friction disc is introduced as an intermediary component between the drive shaft and the clutch mechanism. This friction disc absorbs excessive rotational momentum through friction, preventing direct transmission of harmful forces to the chain and clutch components, thereby reducing damage while maintaining operational reliability
Solution Approach 2:
The friction disc acts as a cushioning element that is engaged before excessive force can damage the system. By providing friction-based resistance in advance, it prevents momentum-induced chain breakage and component damage before they occur
2Area of stationary object
If multiple shade bands are connected in a multi-banded system, then coverage area is increased, but individual band removal becomes difficult without disturbing other bands
Solution Approach 1:
The multi-banded shade system is segmented into independently removable bands. Each shade band is connected through support connectors that can be individually disengaged, allowing one band to be removed without requiring removal of other bands, thus maintaining ease of operation while preserving full window coverage capability
Solution Approach 2:
The support connectors incorporate adjustable and reconfigurable features that allow the system to dynamically adapt between connected and disconnected states. This enables individual bands to be easily added or removed while maintaining stable operation of the remaining bands
3Ease of manufacture
If the shade system uses a fixed bracket mounting, then installation is simplified, but alignment adjustments become difficult after installation
Solution Approach 1:
The bracket system incorporates adjustable features that allow mounting positions to be dynamically modified after installation. Adjustment mechanisms enable fine-tuning of bracket alignment while maintaining the initial simplicity of the mounting process, resolving the contradiction between installation ease and post-installation adjustability
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
These features enhance safety by minimizing damage from excessive force, prevent chain breakage, allow for individual shade band removal without disturbing others, and improve installation and operation accessibility and alignment.
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.