Window Blind Cord Control Device with Integrated Resistance
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Solution Overview
Problem
Conventional window blind pulling cord control devices are complex in structure, leading to numerous assembly steps and high production costs.
Innovation Solution
A simplified pulling cord control device for window blinds featuring a frame with a first and second seat connected by a dividing rack, a pulling cord control wheel set, and at least one coil spring, which eliminates the need for additional resistance devices and reduces component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pulling cord control device with separate resistance device is used, then the window blind can provide resistance to pulling cords, but the structure becomes complex with many assembling steps and high producing cost
Solution Approach 1:
The patent combines the resistance function with the pulling cord control wheel set by integrating the resistance rod into the same assembly. The resistance rod is rotatably disposed within the frame and engages with the pulling cords, allowing the control device to provide resistance without requiring a separate resistance device. This merging of functions reduces structural complexity and assembling steps while maintaining the resistance provision capability.
Solution Approach 2:
The frame structure serves multiple functions: it provides structural support, guides the pulling cords through cord passing grooves, and houses the resistance rod for providing resistance. The pulling cord control wheel set also performs dual functions of controlling cord tension and providing resistance through the integrated resistance rod. This multi-functionality eliminates the need for separate dedicated components.
2Reliability
If a conventional pulling cord control device with separate resistance device is used, then the window blind can provide resistance to the pulling cords, but the assembling process becomes slower and producing cost becomes higher
Solution Approach 1:
By merging the resistance function into the pulling cord control wheel set assembly, the patent reduces the number of discrete components that need to be assembled. The resistance rod is integrated into the frame structure, allowing assemblers to install the control device and resistance mechanism in a single operation rather than separately assembling a dedicated resistance device. This integration directly improves assembling speed and reduces production costs.
3Adaptability or versatility
If multiple pulling cords are used in the window blind, then the cords can interfere with each other, but reducing the number of cords may limit the functionality
Solution Approach 1:
The patent segments the cord passage into separate cord passing grooves within the frame structure. Each groove is specifically designed to guide individual pulling cords along distinct paths, preventing them from crossing or interfering with each other. This segmentation of the cord guidance system allows multiple cords to coexist without interference while maintaining full functionality.
Solution Approach 2:
The frame structure acts as an intermediary element that mediates between multiple pulling cords. The cord passing grooves provided by the frame serve as intermediary channels that organize and separate the cords, preventing direct contact and interference between them. This intermediary structure enables multiple cords to function simultaneously without mutual interference.
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 provides a faster assembly process and lower production costs while maintaining functionality by integrating resistance within the device and preventing cord interference through divided cord passing grooves.
Implementation Method 1
at least one coil spring, and the coil spring is wound around the coil spring winding portions of the pulling cord control wheel set
Data Source
AI summary
A pulling cord control device for a window blind includes a frame including first and second seats connected to form an accommodating space and including first and second bases respectively, and a pulling cord control wheel set and at least one coil spring disposed in the accommodating space. The second seat includes at least one dividing rack integrally extending from the second base toward the first base and including two protruding base portions and a dividing plate integrally connected with the protruding base portions so that two cord passing grooves are formed on two opposite sides of the dividing plate respectively. The pulling cord control wheel set includes at least one pulling cord winding portion facing toward the cord passing groove, and coil spring winding portions the coil spring is wound thereon. The present invention is simple in structure, fast in assembly and low in cost.