Window Blind Position Damping via Shear Ridge Friction
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Solution Overview
Problem
Conventional window blind damping systems face issues with precision errors in metal rod alignment, leading to instability and increased production costs due to the need for high-precision assembly, and are prone to wear and tear, resulting in reduced damping effectiveness and system noise.
Innovation Solution
A position damping device incorporating a spring scroll wheel and a damping shear pillar with a shear ridge, where the pull cord is sheared by the shear ridge to create multidirectional forces, providing effective damping without the need for precise metal rod alignment, and utilizing a turning guide-rod to enhance damping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two metal rods are used to provide friction damping to the pull cord, then damping effect is achieved, but high precision assembly is required leading to increased manufacturing complexity and cost
Solution Approach 1:
The patent extracts the damping function from the metal rod friction mechanism and relocates it to a dedicated damping device positioned at the bottom rail. This separates the damping function from the top truss metal rods, eliminating the need for high-precision alignment of multiple rods while maintaining effective damping through a single localized friction interface.
Solution Approach 2:
The patent introduces a dedicated damping device as an intermediary component between the pull cord and bottom rail. This mediator provides the necessary friction damping through a simplified single-rod or single-component design, avoiding the complexity of coordinating multiple metal rods while achieving the same damping effect.
2Reliability
If multiple metal rods are used for damping, then damping effect is improved, but assembly complexity and production cost increase
Solution Approach 1:
The damping function is extracted from the top trus s metal rod assembly and consolidated into a single dedicated damping device at the bottom rail. This reduces the number of components requiring coordination from multiple metal rods to a single integrated unit, simplifying both assembly and manufacturing.
Solution Approach 2:
The patent combines the damping function with the bottom rail assembly, integrating the damping mechanism into an existing structural component. This merging approach eliminates the need for separate metal rods and reduces the overall number of parts while maintaining damping effectiveness.
3Ease of operation
If metal rods are used to dampen pull cord movement, then position control is achieved, but wear and tear occur leading to reduced effectiveness and increased noise
Solution Approach 1:
The damping device uses a simple friction-based mechanism with a single rod or component that can be easily replaced. The design accepts that wear will occur but makes the damping component inexpensive and simple to replace, maintaining operational effectiveness throughout the product lifecycle without requiring precision maintenance.
Solution Approach 2:
The damping device is designed to maintain effective friction contact throughout its service life without requiring adjustment or maintenance. The self-adjusting nature of the friction interface compensates for wear, keeping the position control function effective without user intervention.
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 achieves improved damping stability and reduced system noise by allowing for easier assembly and reducing wear on components, while maintaining effective control over the slat's position during expansion and collection.
Implementation Method 1
the pull cord 13 that is pulled down will store the elastic force of the spring motor set 20. When the bottom rail 16 is released, the elastic force of the spring motor set 20 will be fed back to the pull cord 13
Implementation Method 2
the pull cord 13 to wrap around back-and-forth and to form friction on the radial surface of the metal rods 17, which causes a damping effect to the pull cord 13
Data Source
AI summary
A window blind position damping device is applied to a window blind with slat being expanded horizontally, forming a damping to a pull cord effectively when the slat is pulled down at any height, so as to define the height. The window blind position damping device includes a machine part, and an interior of the machine part has a spring scroll wheel and a position damping device which links a pull cord through a provided release idler. A damping shear pillar is vertically disposed on a base plate of the provided machine part, between an outlet of the release idler and an opening. By a provided shear ridge, the damping shear pillar shears an overrun section of the pull cord that passes through, forming the damping and thereby defining and fixing the slat at any height when being expanded.