Curtain Drawstring Adjustment Device with Locking Reel
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Solution Overview
Problem
Current retractable curtains face challenges in maintaining uniform drawstring lengths, leading to unbalanced curtain heights, and require adjustments based on curtain differences, necessitating an easy adjustment mechanism for drawstrings.
Innovation Solution
A drawstring adjustment device featuring a base with a shaft hole, a rotatable reel, and a locking assembly with positioning portions to prevent reel rotation and allow for precise length adjustment by disengaging and re-engaging the reel's positioning pins with the base's holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the drawstring length is adjusted by changing the connection position of the bottom end of the drawstring and the curtain, then the drawstring length can be adjusted, but the adjustment process is complex and time-consuming
Solution Approach 1:
The base is segmented into multiple positioning portions arranged in a circular pattern, allowing the reel to be locked at different angular positions. This segmentation enables discrete, easily selectable drawstring length adjustments without complex continuous measurement or repositioning operations.
Solution Approach 2:
The positioning portions are prearranged at specific angular intervals around the base, so that the desired drawstring length corresponds to a pre-prepared position. The user simply needs to rotate the reel to engage with the appropriate pre-positioned positioning portion, eliminating the need for complex adjustment procedures during installation.
2Ease of operation
If the reel is allowed to rotate freely for adjustment, then the drawstring length can be changed, but the reel may rotate uncontrollably causing imprecise adjustment
Solution Approach 1:
The system transitions from a static fixed connection to a dynamic adjustable connection. The reel can rotate freely during adjustment but is automatically locked into precise positions through the engagement between positioning portions and positioning holes, providing both operational ease and adjustment precision.
Solution Approach 2:
The positioning portions and positioning holes act as an intermediary mechanism between the reel and base. This intermediary structure allows controlled rotation during adjustment while ensuring precise final positioning through the meshing of the positioning features, preventing uncontrollable rotation.
3Adaptability or versatility
If multiple positioning portions are provided for different drawstring lengths, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The base with its circular arrangement of positioning portions serves multiple functions: it provides structural support, enables length adjustment, and facilitates locking. The same positioning portions are used by both the reel and the drawstring connection, eliminating the need for separate locking mechanisms and reducing overall device complexity.
Solution Approach 2:
The positioning and locking functions are merged into a single integrated system. The positioning portions on the base simultaneously serve as both positioning references and locking engagement points, combining what could have been separate components into one unified structure that reduces complexity.
Data Source
AI summary
An adjustment device for a drawstring of a curtain with a curtain body includes a base fixed to a bottom end of the curtain body and defining a shaft hole, a reel received and rotatably mounted in the shaft hole of the base, and a locking assembly for limiting an axial displacement of the reel. A sidewall bounding the shaft hole of the base defines a through slot. The base forms a number of first positioning portions distributed in a circle about a central axis of the shaft hole. An end of the drawstring passes through the through slot of the sidewall bounding the shaft hole and is wound on the reel. The reel forms a number of second positioning portions cooperating with the first positioning portions to prevent the reel from rotating.