Multi-Spring Curtain Winding With Gear Speed Change for Position Hold
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Solution Overview
Problem
Existing non-pulling curtain systems using torsion spring rods or head type constant force springs face challenges in controlling pull force and adapting to curtain height and size, leading to difficulties in curtain operation and positioning.
Innovation Solution
A constant force multiple spring curtain winding system with a mounting bracket, revolving drum, speed change mechanism, and constant force spring mechanism, which adjusts the speed of the revolving drum and rotating rod to ensure proper curtain height and width, allowing the curtain to stay at any position by varying the number of spring mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If torsion spring rods or head type constant force springs are used, then the curtain opening and closing system is simple, but the pull force increases as the spring is pulled down making it difficult to control rebound and adapt to different curtain heights
Solution Approach 1:
The patent divides the constant force spring mechanism into multiple independent spring units (first constant force spring, second constant force spring, etc.) that can be selectively assembled. This segmentation allows the system to adapt to different curtain weights and heights by adjusting the number and configuration of spring units, while maintaining consistent and controllable pull force throughout the opening and closing operation.
Solution Approach 2:
The patent changes the key parameter of pull force by using multiple constant force springs arranged in parallel rather than a single spring. This configuration maintains a constant pull force regardless of the spring extension length, solving the problem of increasing pull force in traditional single-spring systems and enabling smooth, controllable curtain operation.
2Device complexity
If a single constant force spring mechanism is used, then the device structure is simple, but it is difficult to adapt to different curtain heights and sizes
Solution Approach 1:
The patent segments the constant force spring mechanism into multiple independent spring units that can be selectively combined. The system includes a first constant force spring mechanism and a second constant force spring mechanism, each with adjustable parameters, allowing the total spring capacity to be matched to different curtain weights and heights while maintaining a relatively simple individual unit structure.
Solution Approach 2:
The patent introduces adjustable and configurable elements within the spring mechanism that can be dynamically adjusted or reconfigured for different applications. The speed change mechanism with adjustable gear ratios and the selectable combination of spring units provide dynamic adaptability to various curtain dimensions and weights without requiring a completely different mechanism design.
3Speed
If the revolving drum rotates at high speed, then the curtain operation is fast, but the drum cannot rotate enough turns to meet the required curtain height
Solution Approach 1:
The patent introduces a speed change mechanism as an intermediary between the revolving drum and the constant force spring mechanism. This mechanism, comprising gears and a speed change shaft, transforms the high-speed rotation of the drum into sufficient rotational turns of the spring mechanisms, enabling both fast operation and adequate height coverage.
Solution Approach 2:
The speed change mechanism allows the system to discard the direct high-speed connection between drum and spring, instead using a gear reduction system that recovers rotational speed while maintaining operational efficiency. The gear train converts drum rotations into multiple effective turns of the constant force springs.
4Area of moving object
If the curtain weight is reduced to maximize width, then the curtain fits better in the space, but the counterweight becomes insufficient for proper operation
Solution Approach 1:
The patent changes the parameter relationship between weight and force by using constant force springs that provide consistent pull force independent of extension length. This allows the use of lighter curtains with larger widths while maintaining sufficient operational force, as the constant force mechanism compensates for the reduced weight rather than relying on weight-proportional spring force.
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 system provides a novel, simple, and versatile solution for curtain operation, allowing precise control over curtain positioning and reducing counterweight, making it easy to use and popularize.
Implementation Method 1
a constant force elastic piece in the constant force spring mechanism, wherein the rotating rod is fixedly connected to the constant force elastic piece
Implementation Method 2
The speed change mechanism comprises a fixed gear, a speed change gear and a speed change cylinder, the speed change gear being connected to the fixed gear and the rotating gear rail through gear engagement
Data Source
AI summary
The present invention provides a constant force multiple spring curtain winding system, including a mounting bracket fixedly connected to a wall, and a revolving drum connected to a curtain, wherein one end of the mounting bracket is connected to a rotating rod through a speed change mechanism, a constant force spring mechanism fixedly connected to the revolving drum is arranged on the rotating rod, and the rotating rod is fixedly connected to a constant force elastic piece in the constant force spring mechanism. According to the present invention, a speed of the revolving drum is adjusted by the speed change mechanism, and the rotating rod rotates at a low speed by the speed change mechanism when the revolving drum rotates at a high speed, thus ensuring that the revolving drum rotates for enough turns to meet a height of the curtain, maximizing a width of the curtain and reducing a counterweight of a lower rail of the curtain; and the requirement on the size of the curtain is met by increasing or decreasing the number of the constant force spring mechanisms, and the curtain is capable of staying at any positions. The constant force multiple spring curtain winding system is novel in structure, simple to operate, wide in application and easy to popularize.