Winding Assembly Cord Tension Adjustment
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Solution Overview
Problem
Existing retractable curtain systems fail to adjust the tensile force of the cord in response to changes in the weight of the curtain body, leading to potential imbalance and operational inefficiencies.
Innovation Solution
A winding assembly with a fixing seat and a winding shaft, featuring guiding holes and a threading hole of varying diameters, allows the cord to pass through at different positions, enabling adjustment of tensile force based on the curtain body's weight, integrated with a synchronizing wheel group and transmission assemblies for efficient cord management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the cord is wound on a fixed winding shaft with a single threading hole, then the structure is simple, but the tensile force cannot be adjusted according to the weight of the curtain body
Solution Approach 1:
The single threading hole is segmented into multiple threading holes positioned at different locations on the fixing seat. Each threading hole corresponds to a different cord length and tensile force configuration. This allows the system to adapt to different curtain weights by selecting the appropriate threading hole, providing adjustability without requiring a completely reconfigurable mechanism.
Solution Approach 2:
The fixing seat is designed with multiple threading holes that serve different functions - each hole is optimized for specific curtain weight ranges. This multi-functional design allows a single fixed structure to handle variable requirements (different curtain weights) by selecting the appropriate threading hole, achieving adaptability within a fixed framework.
2Ease of operation
If the cord passes through multiple guiding wheels, then the cord can be routed properly, but the cord may become intertwined and the operation becomes less smooth
Solution Approach 1:
The patent extracts and eliminates the intermediate guiding wheels from the cord path. Instead of routing the cord through multiple guiding wheels (which causes intertwining), the cord is directly connected from the curtain body to the winding shaft through the threading hole. This direct connection path prevents cord entanglement while maintaining proper cord routing.
Solution Approach 2:
The threading hole is pre-positioned and pre-configured in the fixing seat to establish the correct cord path before operation begins. The cord length and routing are predetermined during installation, preventing operational issues like intertwining during retraction and extension cycles.
3Ease of manufacture
If the winding shaft has a uniform outer diameter, then the manufacturing is simple, but the cord tension distribution is uneven
Solution Approach 1:
The winding shaft is designed with a non-uniform outer diameter, creating different sections with varying diameters. Each section is optimized for specific cord winding requirements - larger diameter sections provide better cord distribution and tension balance for heavier curtains, while smaller diameter sections are suitable for lighter curtains. This local variation in geometry improves force distribution without completely complicating the manufacturing process.
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 dynamic adjustment of cord tension according to the curtain body's weight, ensuring balanced operation and preventing cord intertwining, resulting in smooth retraction and rolling mechanisms.
Implementation Method 1
a coil spring is wound on the synchronizing wheels to provide reset force
Implementation Method 2
each transmission assembly comprises a first bevel gear and a second bevel gear which are engaged with each other
Data Source
AI summary
A winding assembly and a retractable curtain, which may adjust the tensile force of a cord. The winding assembly of the retractable curtain comprises a fixing seat and a winding shaft rotatably disposed on the fixing seat, wherein a threading hole and guiding holes are opened in the fixing seat for the cord to pass through successively; there is a plurality of guiding holes opened in different positions of the fixing seat, and the threading hole is located between the outer wall of the winding shaft and the plurality of guiding holes. The outer wall of the winding shaft tilts outward gradually along the axis thereof, and the threading hole is opened on a part of the fixing seat corresponding to one end of the winding shaft with a larger outer diameter.