Window Covering Roller Mechanism for Positional Adjustment
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Solution Overview
Problem
Window coverings with spring motors often require expensive spring elements and substantial transmission systems to support the variable load of the window covering material, increasing costs and complexity.
Innovation Solution
A new window covering design featuring a cordless mechanism with a positional adjustment system that includes a spring motor unit, lift cord pulleys, and a roller mechanism that limits rotational direction after a pre-selected number of revolutions, reducing the need for expensive spring elements and simplifying the operational system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional spring motors with substantial transmission systems are used, then the window covering can support variable load, but the cost and device complexity increase substantially
Solution Approach 1:
The patent extracts and eliminates the complex transmission system from the spring motor unit. Instead of using traditional substantial transmission mechanisms, the invention uses a simplified spring motor that directly engages with the lift cord pulley, removing unnecessary intermediate components while maintaining the ability to support variable loads through the spring's inherent mechanical properties
Solution Approach 2:
The patent changes the operational parameters of the spring motor by allowing it to rotate in only one direction (single-direction rotation) rather than bidirectional rotation in traditional systems. This parameter change simplifies the transmission system while the spring's elastic properties enable it to handle variable loads effectively through controlled winding and unwinding
2Reliability
If expensive special construction spring members are used, then the spring motor can support variable load, but the manufacturing cost increases
Solution Approach 1:
The patent employs a simpler, more economical spring member construction that can be manufactured at lower cost. Instead of using expensive special construction spring members with complex geometries, the invention uses a standard helical spring design that achieves the required variable load support through proper sizing and material selection, making the component more affordable to manufacture
Solution Approach 2:
The patent inverts the traditional approach by using the spring's natural elastic properties in reverse - rather than designing complex mechanisms to accommodate spring variability, the system is designed to work with the spring's inherent characteristics, allowing the spring to naturally handle load variations through its elastic deformation without requiring precision-engineered complex structures
3Device complexity
If cordless mechanism with limited roller rotation is used, then the operational system is simplified, but the control precision must be maintained
Solution Approach 1:
The patent implements a dynamic roller mechanism that changes its rotational characteristics during operation. The roller is designed to rotate freely during the extension phase (when the window covering is being lowered) and then locks after a predetermined number of rotations during retraction (when raising the covering). This dynamic behavior simplifies the operational system while maintaining precise position control through the locking mechanism that prevents over-rotation
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 new design allows for effective height adjustment of window coverings while reducing costs by using less expensive spring elements and simplifying the operational mechanism, providing precise control and maintaining user-selected positions without the need for exposed operator cords.
Implementation Method 1
The first roller can be configured such that the first roller rotates in a first rotational direction when the window covering is moved from the retracted position to the extended position
Implementation Method 2
The first roller can also be configured to rotate in a second rotational direction that is opposite the first rotational direction for only a pre-selected number of revolutions when the window covering material is moved from the extended position to the retracted position such that the first roller no longer rotates in the second rotational direction
Data Source
AI summary
A window covering includes a positional adjustment mechanism connected to a first rail that includes a spring motor unit, a first lift cord pulley connected to the spring motor unit, a first lift cord collection mechanism having a first roller positioned in the first rail, and a first lift cord that extends from the first lift cord pulley through window covering material such that a portion of the first lift cord passes along the first roller. The first roller is configured so that it only rotates a pre-selected number of revolutions when the window covering material is moved from the extended position to the retracted such that the first roller no longer rotates in the second rotational direction as the window covering material is moved from an extended position to a retracted position after having rotated the pre-selected number of revolutions in the second rotational direction.