Roller Shade Fabric Automatic Descent With Threaded Limit Stops
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Solution Overview
Problem
Existing roller shades often experience issues with precise control over stopping positions, leading to accidental over-pulling and flipping of the shade, resulting in a poor user experience.
Innovation Solution
An automatic descending structure for roller shade fabric with limiting mechanisms that include first and second limiting mechanisms, a locking and releasing mechanism, and positioning beads to ensure accurate stopping at desired heights, preventing excessive pulling and flipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the user pulls the cord to control the shade's movement, then the shade can be raised or lowered, but the shade may continue to be pulled even after reaching the highest position causing the fabric to flip over
Solution Approach 1:
The patent applies preliminary action by pre-setting the highest position limit through the limiting mechanism (screw and rotating sleeve with limiting piece) before the user operates the shade. This prevents over-pulling by establishing a physical barrier in advance, eliminating the need for users to precisely judge when to stop pulling while maintaining ease of operation.
2Reliability
If a limiting mechanism is added to prevent excessive pulling, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The limiting mechanism is designed to be self-regulating through the interaction between the screw thread, rotating sleeve, and limiting piece. The mechanism automatically engages when the shade reaches the highest position without requiring external control or complex sensors, achieving reliable protection with minimal added complexity.
Solution Approach 2:
The limiting mechanism uses simple, inexpensive mechanical components (screw, rotating sleeve, limiting piece) rather than complex electronic systems. These basic mechanical elements provide reliable limiting functionality while keeping the overall device complexity and cost low.
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 structure allows reliable and easy operation by limiting the shade at the highest and lowest positions, enabling users to stop the shade at desired heights with minimal effort, enhancing user experience.
Implementation Method 1
the first limiting mechanism including a first screw and a first rotating sleeve threadedly sleeved on the first screw
Data Source
AI summary
Disclosed are an automatic descending structure for roller shade fabric and a manually operated roller shade. The automatic descending structure for roller shade fabric includes: a roller shade controller for controlling lifting and lowering the roller shade fabric, the roller shade controller includes a roller shade drum and a first housing and a second housing arranged opposite to each other, the roller shade drum is rotatably arranged between the first housing and the second housing and is connected to the roller shade fabric, the roller shade fabric is lifted and lowered by the rotation of the roller shade drum, a first limiting mechanism for limiting an ascending position of the roller shade fabric is arranged on the first housing, so that the roller shade fabric has an ascending limit position; the first limiting mechanism includes a first screw and a first rotating sleeve threadedly sleeved on the first screw.