Roller Shade Clutch and Adjustment Structure for Overload Control
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Solution Overview
Problem
Roller shade systems face issues with damage due to excessive force, chain breakage from 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 center drive mechanism for improved accessibility, and a slide lock for preventing unrolling, along with adjustable components for alignment and easy shade band removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional clutch system is used in multi-banded shade systems, then the shade can be operated, but the system is vulnerable to damage from excessive force and chain breakage from momentum
Solution Approach 1:
The patent applies beforehand cushioning by incorporating a slip plate mechanism that allows controlled slippage when excessive force is applied. The slip plate has protrusions that engage with slots in the clutch assembly, permitting the plate to slip forward and absorb momentum rather than transmitting damaging forces to the chain and clutch components. This preventive design cushions the system against harmful forces before they can cause damage.
2Ease of repair
If the clutch system is removed for maintenance in multi-banded systems, then maintenance is simplified, but the shade band may unroll uncontrollably
Solution Approach 1:
The patent applies preliminary anti-action by incorporating a slide lock mechanism that prevents the shade band from unrolling during maintenance operations. The slide lock includes a first opening that allows rotation during normal operation and a second opening that restricts rotation when engaged. This preliminary protective measure counteracts the potential harmful effect of uncontrolled unrolling before maintenance begins, allowing the clutch system to be removed or serviced without creating safety hazards.
3Device complexity
If the support connector is fixed in position, then the structure is simpler, but alignment adjustments are difficult
Solution Approach 1:
The patent applies dynamics by designing a support connector that can transition between fixed and adjustable states. The connector includes a first portion and a second portion where the first portion can retract into the second portion, allowing for alignment adjustments during installation. Once positioned, the connector can be locked in place. This dynamic design enables the connector to provide both adjustability during installation and structural stability during operation, resolving the contradiction between simplicity and ease of adjustment.
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.