Selective Attenuating Earplug With Cantilever Switch
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Solution Overview
Problem
Existing hearing protective devices lack the ability to selectively attenuate sound frequencies and intensities, failing to allow intelligible speech or warning signals while blocking dangerous noises effectively, and often require complex mechanisms or precise adjustments.
Innovation Solution
A selective attenuating earplug with a switch mechanism using cantilever spring arms that can be adjusted between open and closed positions to allow or block sound, utilizing a tip and body design with an acoustic channel and filters to manage sound attenuation based on user needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switch mechanism is added to enable selective attenuation modes, then the adaptability of the earplug is improved, but the device complexity increases
Solution Approach 1:
The switch mechanism is divided into separate functional components: a first cantilever spring arm for engagement/disengagement, a second cantilever spring arm with sealing pad for blocking, and respective recesses in the body. This segmentation allows each component to perform its specific function independently, achieving selective attenuation capability while keeping the overall mechanism relatively simple and manageable.
2Ease of operation
If cantilever spring arms are used for the switch mechanism, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The cantilever spring arms are designed to be self-actuating through their elastic properties. When the user applies force to move the switch, the spring arms automatically engage with the recesses and the sealing pad blocks the aperture without requiring additional actuators, motors, or complex control systems. The spring arms self-regulate their engagement and disengagement, providing ease of operation while maintaining relatively simple device structure.
3Object-affected harmful factors
If a sealing pad is added to block the aperture completely, then the noise attenuation performance is improved, but the device complexity increases
Solution Approach 1:
The sealing pad is implemented as a flexible element attached to the second cantilever spring arm. This flexible sealing pad can conform to the aperture shape and provide effective noise blocking when engaged, while its flexibility allows it to be integrated into a simple cantilever spring mechanism rather than requiring rigid, complex mechanical components. The thin film nature of the sealing pad enables effective attenuation without adding significant structural complexity.
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
Enables users to choose between modes that allow specific sound frequencies or intensities to pass through while attenuating others, providing effective noise protection without the need for complex mechanisms, ensuring both safety and situational awareness.
Implementation Method 1
a first cantilever spring arm including a shape that interacts with a feature on a surface of the body, and the shape is biased against the feature on the surface of the body to maintain the switch in the first position or the second position
Implementation Method 2
an acoustic channel extending from a first end of the tip to an aperture of the body
Implementation Method 3
a filter that restricts high-impulse noise before entering the ear canal
Data Source
Figure 1~2
Figure 3a~3b
Figure 4~5
AI summary
A selective attenuating earplug (300) is provided. In an exemplary embodiment, a selective attenuating earplug includes a switch (330) adjustable between a first position and a second position, and the switch includes at least one cantilever spring arm (333, 334).