Window Curtain Pulling Mechanism for Smooth Height Positioning
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Solution Overview
Problem
Existing curtain devices struggle to smoothly roll one-piece curtains up or down to a desired height, as the pulling string often gets stuck or fails to control the curtain's position effectively.
Innovation Solution
A window curtain pulling device with a rotary member module and guide rod system, allowing for smooth movement and fixation of the curtain cloth through a pushing member and pulling string wheel module, enabling precise control over the curtain's height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pulling string is pulled towards the right inclined direction, then the curtain cloth can be opened completely, but the pulling string will be stuck and the curtain cloth will be rolled up to the top
Solution Approach 1:
The patent introduces a guide rod as an intermediary component between the pulling string and the curtain cloth. The guide rod includes a guide groove that directs the pulling string along a predetermined path, preventing the string from getting stuck while ensuring the curtain opens completely. This mediator component resolves the conflict between operational ease and reliability by controlling the string's movement trajectory.
Solution Approach 2:
The patent employs dynamic elements including a rotatable rotary member with a guide groove that can pivot, and a pushing member that moves along the guide rod. These dynamic components adapt to different curtain positions during operation, maintaining smooth pulling string movement throughout the entire opening and closing cycle, thus preventing sticking while ensuring complete opening.
2Ease of operation
If the pulling string is pulled to roll the curtain up or down, then the curtain can move, but it cannot be fixed to a desired height
Solution Approach 1:
The patent implements a feedback mechanism where the guide groove in the rotary member and the guide rod work together to provide positional feedback. As the pulling string moves along the guide groove, it naturally stops at specific positions determined by the groove's geometry, allowing the curtain to be held at desired heights without additional fixing mechanisms.
Solution Approach 2:
The guide groove is pre-designed with specific geometric features that create natural stopping points or dwell positions. This preliminary action in the groove design allows the curtain to automatically position itself at desired heights during the pulling operation, enhancing adaptability while maintaining ease of operation.
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
Enables smooth rolling and fixing of the curtain cloth at desired heights, improving the applicability and usability of the curtain device.
Implementation Method 1
the conical body is pushed to rotate outward by the slanting surface of a guide groove
Data Source
AI summary
A window curtain pulling device comprises a guide module, a pulling string wheel module, a rotary member module, a fixed casing, and a connecting component. A guide rod having a positioning ring passes through the rotary member module and latches the rotary member by a positioning ring. A pushing member coupled to the guide rod is latched with a fixed casing by a passing rod, such that an end of a pulling string at another side of a pulling string wheel module of the guide module is pulled to open a curtain, and another end of the pulling string is pulled once again. The rotary member includes a corresponding guide groove on one side and matches with a conical body of the pushing member, and the conical body is pushed by a slant of guide grooves of the coupling member pivotally coupled to the rotary member to rotate outward.