Roller Shade Decelerating Device for Impact Reduction
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Solution Overview
Problem
Conventional roller shades lack proper upper and lower positioning devices, leading to issues such as excessive curtain sheet length when pulled down and high impact force and noise when rolled up to the upper limit, which can damage internal parts.
Innovation Solution
A decelerating and positioning device for roller shades, comprising a sleeve with a convex cover wall and a protruding rod, an elastic member, a rotator with a clamping part and protrusion, a limiting rotating body, and a fixing shaft. This configuration generates a buffering deceleration effect when the roller shade is rolled up to the upper limit, reducing impact force and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a limiting device is installed in the roller shade to provide upper and lower positioning, then the curtain sheet can be positioned at the lower limit, but large impact force and large noise are generated when the roller shade reaches the upper limit position, causing parts inside the limiting device to be damaged over time
Solution Approach 1:
The patent applies beforehand cushioning by installing a damping element (such as a rubber bumper or elastic cushion) at the upper limit position of the limiting device. This cushioning element is positioned in advance to absorb the impact force when the roller shade reaches its upper limit, preventing direct collision between hard components. The cushioning structure reduces impact force and noise while maintaining reliable positioning, thereby resolving the contradiction between positioning reliability and harmful impact forces.
2Device complexity
If conventional roller shades are used without proper positioning devices, then the structure remains simple, but the curtain sheet may be pulled too long when pulled down
Solution Approach 1:
The patent introduces an intermediary limiting device that acts as a mediator between the simple structure and the need for positioning control. The limiting device includes a limiting body with positioning features that engage with corresponding features on the roller shade, providing automatic positioning at upper and lower limits. This intermediary structure adds minimal complexity while significantly improving ease of operation by preventing over-pulling and ensuring proper curtain positioning without requiring user judgment or manual intervention.
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 device effectively reduces impact force and noise when the roller shade reaches the upper limit, preventing damage to internal parts and providing a smooth operation.
Implementation Method 1
an elastic member, wherein a side of the elastic member is sheathed on one side of the sleeve, an other side of the elastic member is fixed on a side of a rotator, and the elastic member extends and retracts between the sleeve and the rotator
Data Source
AI summary
A decelerating and positioning device for a roller shade, the decelerating and positioning device comprising a sleeve, an elastic member provided on one side of the sleeve, a rotator providing an engagement structure on an other side of the elastic member, a limiting rotating body pushes the rotator to rotate and displace, and a fixing shaft allowing the limiting rotating body and the rotator to rotate.