Asymmetric Ear Plug Flange Design for Sound Attenuation
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Solution Overview
Problem
Conventional ear plugs fail to provide effective sound attenuation while minimizing hearing damage, as they often bunch in the ear canal, leading to sound leaks and discomfort, and are difficult to insert and remove.
Innovation Solution
The design features a pair of flanges with oblong perimeters and a cylindrical shaft with a sound filter, which expands to conform to the ear canal, reducing bunching and incorporating a pull tab for easy removal, ensuring a secure fit and effective sound attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional cylindrical ear plugs are used, then some sound attenuation is provided, but the ear plugs bunch in the ear canal causing sound leaks and discomfort
Solution Approach 1:
The ear plug transitions from a conventional circular cross-section to an asymmetric shape with a flattened side. This asymmetric geometry prevents the ear plug from rotating and bunching within the ear canal, eliminating slit leaks while maintaining effective sound attenuation across the ear canal opening.
Solution Approach 2:
The ear plug incorporates a curved or rounded leading end that conforms to the natural curvature of the ear canal entrance. This curved geometry facilitates smooth insertion and proper positioning, preventing bunching while ensuring the flattened side remains oriented correctly to block sound leaks.
2Reliability
If circular flanges are used to seal the ear canal, then a seal is achieved, but the flanges bunch and create discomfort
Solution Approach 1:
The flange is designed with an asymmetric shape featuring a flattened side rather than a complete circle. This asymmetric geometry prevents the flange from rotating and bunching within the ear canal, maintaining reliable sealing contact with the ear canal walls while eliminating the discomfort caused by bunching and fold leaks.
3Reliability
If multiple flanges are used to create a proper seal, then sealing is improved, but insertion depth increases causing tissue irritation
Solution Approach 1:
The sealing function is divided between the asymmetric flange structure and the main ear plug body. The flange provides the primary sealing contact with its flattened side, while the tapered body of the ear plug assists in sealing as it is inserted into the ear canal, distributing the sealing function across multiple structural elements rather than requiring multiple separate flanges.
Solution Approach 2:
The ear plug features a tapered, curved body that naturally guides insertion into the ear canal. This curved geometry facilitates smooth insertion at the correct angle and depth, ensuring the flange positions itself properly to create an effective seal without requiring excessive insertion depth that would irritate sensitive ear canal tissues.
4Reliability
If conventional ear plugs are designed for secure fit, then they stay in place, but they become difficult to remove
Solution Approach 1:
The ear plug incorporates a pull tab extending from the flattened side, creating an asymmetric feature that serves as a mechanical advantage for removal. While the asymmetric shape and flange provide secure retention during use, the pull tab offers a convenient gripping point that reverses the insertion action, allowing easy removal by simply pulling on the tab in the opposite direction of insertion.
Data Source
AI summary
Sound attenuation devices are provided that may be temporarily worn in a person's ear. The devices generally include a first flange that is configured to be disposed in a person's ear; a second flange that is positioned proximate to the first flange and is also configured to be disposed in the person's ear (with the second flange having a proximate end that exhibits an oblong perimeter); and a cylindrical shaft extending from an interior portion of the second flange. The shaft includes an integrally connected pull tab; it extends beyond the proximate end of the second flange; and the shaft includes an integrally formed reinforcing member that spans an exterior side of the shaft and at least a portion of the pull tab. The devices further include a sound filter disposed within an internal cavity of the shaft.