Compact Roller Shade Buffer Device Reducing Friction and Noise
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Solution Overview
Problem
Conventional buffer devices for roller shades have a large outer diameter after assembly, making them unsuitable for small-sized roller shades used in car doors and increasing noise due to high friction, which is costly and difficult to install.
Innovation Solution
A buffer device with a reduced outer diameter design, featuring a housing body, a covered cylinder with a column and lubricating oil, a spring, and a rotating body, which reduces friction and noise by using a gap and lubricating oil, allowing smooth operation and installation in smaller spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shaft rod and spring are provided inside the covered cylinder to reduce friction and noise, then the buffering performance is improved, but the outer diameter of the buffer device is enlarged
Solution Approach 1:
The patent removes the shaft rod from the buffer device structure. Instead of having a shaft rod inside the covered cylinder, the invention uses a spring directly mounted on the covering body, with the covered cylinder serving only as a protective cover. This extraction of the unnecessary shaft rod component reduces the inner diameter requirement while maintaining the noise-reduction function through the spring and lubricating oil system.
Solution Approach 2:
The patent applies lubricating oil specifically in the gap between the column and the first accommodating space, creating a localized lubrication zone. This local quality approach reduces friction and noise at the critical contact point without requiring a larger overall structure. The lubricating oil is confined to where it is most needed, optimizing space utilization.
2Ease of manufacture
If the outer diameter of the covered cylinder is enlarged to accommodate the spring, then the spring can be installed, but the overall outer diameter of the buffer device increases further
Solution Approach 1:
The patent implements a nested structure where the spring is mounted on the covering body and the covered cylinder is coveredly provided over the spring. This nesting arrangement allows the spring to be installed without requiring an enlarged covered cylinder inner diameter. The covered cylinder serves as a protective cover that can be fitted over the compact spring assembly, maintaining a small overall outer diameter while facilitating spring installation.
3Object-affected harmful factors
If lubricating oil is injected into the housing body to reduce friction, then noise is reduced, but the device complexity increases
Solution Approach 1:
The patent applies lubricating oil in a specific localized gap between the column and the first accommodating space, rather than throughout the entire housing body. This localized lubrication approach reduces noise effectively while minimizing the complexity of the lubrication system. The oil is confined to the critical friction area, simplifying the overall device structure compared to comprehensive lubrication systems.
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 buffer device enables smooth drawing and slowed-down furling with reduced noise and friction, making it suitable for small-sized roller shades on doors and car doors, improving user experience and reducing auditory impact.
Implementation Method 1
a column, a blocking projecting ring, and a projectingly connected portion; a covered cylinder, the covered cylinder being provided within the first accommodating space of the housing body with the column in which a slight gap is formed between the column and the first accommodating space, and lubricating oil injected into the slight gap
Implementation Method 2
a spring, the spring surrounding the outer edge of the projectingly connected portion of the covered cylinder together with the covering body
Data Source
AI summary
A buffer device for small-sized roller shade comprises a housing body, a covered cylinder within the housing body, an oil seal over the outer edge of the covered cylinder and sealing with respect to the housing body, a covering body secured onto the housing body, a spring surrounding the outer edge of the covered cylinder away from the housing body and the covering body, a rotating body accommodating the covered cylinder around which the spring is provided, such that the spring and the covered cylinder are combined to rotate, a closure cap connected over the outer edge of the covered cylinder and synchronously rotated therewith, and a securing part away from the housing body while combined with the closure cap and the covered cylinder. Thus, the buffer device is reduced in volume for providing a shade panel with buffer effect in drawing/furling process.