Spring Drive System for Cordless Window Shades
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Solution Overview
Problem
Conventional spring drive systems for window shades are not easily adaptable to different sizes or types of window shades, posing challenges in terms of safety and functionality, particularly with regards to cordless operation to mitigate strangulation risks.
Innovation Solution
A spring drive system comprising a housing with multiple gears, springs, and cord drums, where the gears and springs are arranged to provide a compact and adaptable mechanism for raising and lowering the window shade, with a gear train system that allows for efficient winding and unwinding of suspension cords, and includes guide rollers for uniform winding, enabling easy integration with various window shade types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional spring drive systems are used, then the mechanism can raise and lower the window shade, but the system is not easily adaptable to different sizes or types of window shades
Solution Approach 1:
The spring drive system is designed with a universal configuration that can accommodate different window shade sizes and types through adjustable components. The housing can be positioned at different locations (head rail, intermediate rail, or bottom rail), and the system can be configured with one or two springs depending on the application requirements, making it adaptable across various window shade configurations without requiring complete redesign.
Solution Approach 2:
The system incorporates adjustable and reconfigurable elements that allow dynamic adaptation to different applications. The guide rollers can be positioned to accommodate different cord winding requirements, the spring tension can be adjusted, and the housing location can be changed based on the specific window shade type and size, enabling the same basic mechanism to serve multiple functions.
2Object-affected harmful factors
If operating cords are used to manually raise and lower the window shade, then the mechanism is simple, but there are strangulation risks to children
Solution Approach 1:
The dangerous operating cords are completely removed from the system. Instead of using外露 cords that children could pull or get tangled in, the invention uses an internal spring mechanism with cord drums that wind and unwind suspension cords internally. The bottom rail is raised by the spring mechanism winding the suspension cords, and lowered by controlled unwinding, eliminating all external operating cords that pose strangulation hazards.
Solution Approach 2:
The spring mechanism acts as an intermediary between the power source and the bottom rail, replacing the need for direct cord operation. The suspension cords are contained within the system and controlled by the spring-driven cord drums, which provide a safe intermediate mechanism that eliminates the need for children to directly handle operating cords while still achieving the desired raising and lowering function.
3Adaptability or versatility
If a compact spring drive system is designed, then the mechanism can be easily integrated with various window shade types, but the gears and components must be arranged in a space-constrained environment
Solution Approach 1:
The system employs a nested arrangement where components are arranged concentrically and in overlapping configurations. The guide rollers are positioned to guide cords through the housing structure, the springs are mounted within the housing, and the cord drums are arranged to share space efficiently. This nesting approach allows all necessary components to be contained within a compact volume that can be easily integrated into various window shade configurations.
Solution Approach 2:
The design utilizes three-dimensional spatial arrangement to pack components efficiently. The gears are positioned at different heights and angles, the springs are mounted in orientations that optimize space usage, and the cord drums are arranged to utilize vertical and horizontal space simultaneously. This multi-dimensional arrangement allows the system to achieve compactness while maintaining all necessary functional clearances and component interactions.
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 safe, adaptable, and efficient means to operate window shades without exposed cords, allowing for easy adjustment and integration with different window sizes and types, enhancing safety and operational convenience.
Implementation Method 1
Spring motors used in window shades generally consist of springs that are operable to apply a torque for keeping the bottom rail at a desired height
Implementation Method 2
a first and a second spring respectively assembled at two opposite sides of the second gear around a second pivot axis
Data Source
AI summary
A spring drive system for a window shade includes a housing, a first and a second gear engaged with each other and respectively assembled about a first and a second pivot axis, two springs respectively assembled at two opposite sides of the second gear and respectively connected with two take-up reels provided on the first gear, a first cord drum and a third gear fixedly connected with each other and assembled about a third pivot axis, the first and third gears being respectively located at different levels along the first and third pivot axes and respectively engaged with a first gear train, a second cord drum and a fourth gear fixedly connected with each other and assembled about a fourth pivot axis, the second and fourth gears being respectively located at different levels along the second and fourth pivot axes and respectively engaged with a second gear train.