Self-Retracting Blind Control With Dual Clutch Operation
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Solution Overview
Problem
Conventional blinds often confuse users about the direction of operation for the control member, leading to potential misoperation, and the control member can catch passer-bys, pets, or furniture due to its extended length when not in use, resulting in an aesthetically poor appearance.
Innovation Solution
A blind system featuring a turnably supported pulley with an urging member and dual clutch mechanisms that allow the control member to be wound and unwound, enabling the rotation shaft to rotate in one direction for raising or lowering the shielding member, and switching directions based on the pulley's angle of rotation, ensuring the control member remains compact and preventing accidental operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the control member is hung down from the blind supporting member to ensure sufficient operation length, then the operation length is sufficient, but the control member may catch passer-bys, pet animals, furniture or the like and creates aesthetically poor appearance
Solution Approach 1:
The control member's state is made dynamic between extended (during operation) and retracted (at rest) positions. The urging member automatically winds the control member onto the pulley when not in use, transforming it from a static hanging state to a dynamic self-retracting state that adapts to operational needs.
Solution Approach 2:
The urging member provides self-service functionality by automatically winding the control member onto the pulley when the blind is not being operated. This eliminates the need for manual retraction and ensures the control member is always in a safe, compact position when not in use.
2Length of moving object
If the control member is hung down from the blind supporting member, then the operation length is sufficient, but it confuses the user as to which direction the user should operate the control member
Solution Approach 1:
The control mechanism is segmented into distinct functional components: the pulley for directional rotation, the urging member for automatic retraction, and the clutch mechanisms for controlled engagement. This segmentation allows the control member to have different functional states (winding vs. unwinding) with clear directional cues.
Solution Approach 2:
The urging member provides tactile and visual feedback to the user through its winding action. When the control member is pulled, the user can feel the resistance and see the control member unwind from the pulley, providing clear directional feedback that eliminates confusion about the correct operation direction.
3Object-affected harmful factors
If the control member is kept compact by winding it onto the pulley using an urging member, then the control member does not catch external objects, but the structure becomes more complex with clutch mechanisms
Solution Approach 1:
The clutch mechanisms are merged with the existing blind structure, integrating the complexity into the housing and support components rather than adding separate external mechanisms. The first and second clutch mechanisms are incorporated into the pulley assembly and supporting member structure, consolidating functions.
Solution Approach 2:
The clutch mechanisms act as intermediaries between the control member and the blind's lifting mechanism. They provide controlled engagement and disengagement without requiring complex direct linkages, simplifying the overall control system while maintaining the automatic retraction functionality.
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 solution allows for easy and quick operation of the blind by ensuring the control member is always unwound, preventing confusion about the operation direction and keeping it compact, thus avoiding entanglements with external objects while maintaining an aesthetically pleasing appearance.
Implementation Method 1
an urging member which urges the pulley in the direction of winding the control member
Data Source
AI summary
A blind comprises a turnably supported pulley, a control member of which one end is connected to the pulley so as to permit the control member to be wound around and unwound from the pulley, an urging member which urges the pulley in the direction of winding the control member, a first clutch mechanism which is disposed between the rotation shaft and the pulley, and can selectively link the pulley and the rotation shaft with each other to transmit the rotation of the pulley to the rotation shaft or unlink the pulley and the rotation shaft from each other to interrupt the transmission of the rotation of the pulley to the rotation shaft, and a second clutch mechanism which can selectively link the rotation shaft and a fixed member with each other or unlink them from each other.