Two-Way Curtain Pulling Base Segmentation
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Solution Overview
Problem
Existing two-way up-down curtains face issues where applying downward force to maintain the curtain's fully expanded state causes the mobile top and bottom to move, resulting in a clearance between the fixed and mobile top bases, disrupting the shielding effect and requiring additional adjustments.
Innovation Solution
The curtain design features a pulling base fixed to the extended end of a first thread, allowing only the thread to be pulled when additional downward force is applied, preventing the mobile top and curtain from moving and maintaining the shielding effect without clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user continues to apply downward force to the pulling base after the curtain is fully expanded, then the user ensures the curtain cannot be unfolded anymore, but the mobile top and curtain move down causing clearance between fixed top base and mobile top, losing shielding effect
Solution Approach 1:
The pulling base is segmented from the curtain assembly, connected only to the first thread rather than being integrated with the mobile top and curtain. This segmentation allows the pulling base to remain stationary while the curtain moves, preventing clearance formation and maintaining shielding effect.
Solution Approach 2:
The first thread acts as an intermediary element between the pulling base and the curtain system. When the user pulls the pulling base, force is transmitted through the first thread to control curtain movement without directly moving the pulling base itself, preventing clearance while maintaining operational control.
2Reliability
If the pulling base is fixed to the extended end of the first thread only, then only the first thread is pulled when additional downward force is applied, but the structure complexity increases
Solution Approach 1:
The structure is divided into independent functional components: the pulling base connected only to the first thread, and the curtain assembly (mobile top + curtain) connected to the second thread. This segmentation creates a simple yet effective system where each component has a dedicated function, reducing overall structural complexity while improving reliability.
Data Source
AI summary
A two-way up-down curtain includes a fixed top base including a device space and its bottom is drilled several eyelets. A coil rope control device is located in the device space is coiled with a first and a second thread. The threads penetrate through the eyelet in the bottom of the fixed top base. A curtain under the fixed top base includes a mobile top, a bottom and a curtain. The first thread penetrates through the mobile top, curtain and bottom downwards, and through the bottom downwards with an extended end. A pulling base is only fixed to the extended end of the first thread mutually, so that the user can push and pull the mobile top or the pulling base by hand to change the state of the curtain. The mobile top can be actually prevented from moving to result in clearance to the fixed top base.