Earplug with String Loop for Easy Removal
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Solution Overview
Problem
Users are hesitant to insert earplugs deeply due to concerns about removal, leading to poor sound blocking as they are unsure if the earplug is properly seated, and supervisors find it difficult to verify correct installation.
Innovation Solution
A low-cost earplug design featuring a short, cylindrical foam body with a flexible string loop attached to the rear portion, allowing easy removal by pulling the loop, ensuring the earplug lies flush with the ear canal entrance and preventing jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the earplug is inserted deeply into the ear canal for good sound blocking, then the sound blocking effectiveness is improved, but the user becomes concerned about removal difficulty and may not hold it in position long enough for proper expansion
Solution Approach 1:
The earplug is segmented into two functional parts: the foam body for sound blocking and the separate string loop for removal. This segmentation allows the foam body to be inserted deeply for effective sealing while the string loop remains accessible outside the ear canal for easy removal, resolving the contradiction between deep insertion and easy removal.
Solution Approach 2:
The string loop acts as an intermediary element that connects to the foam body internally but extends externally for user manipulation. This intermediary allows the user to pull the earplug out without needing to reach deep into the ear canal, making removal as easy as insertion while maintaining deep insertion for sound blocking.
2Reliability
If the earplug body is made elongated for deep insertion, then the sound blocking is improved, but the rear end may tip and jam in place making removal difficult
Solution Approach 1:
By separating the functional elements (foam body for sealing, string loop for removal), the design allows the foam body to be optimally shaped for deep insertion without the removal function interfering. The string loop attachment point is positioned to prevent the foam body from tipping during removal.
Solution Approach 2:
The string loop is pre-positioned and attached to the foam body before insertion. This preliminary arrangement ensures that when the user pulls the string loop, the force is applied in a way that prevents the foam body from tipping or jamming, making removal smooth and easy from the start.
3Ease of operation
If the earplug is made with a flared rear end for grasping, then removal is possible, but the design becomes more complex and costly
Solution Approach 1:
The grasping function is extracted from the foam body itself and implemented through a separate string loop. Instead of making the foam body complex with flared ends or built-in handles, the simple string loop provides the grasping function, keeping the foam body design simple and the overall device low-cost.
Solution Approach 2:
The string loop is a simple, inexpensive component that can be easily attached to the foam body. This approach uses a low-cost solution for the grasping function rather than investing in complex molded features or multiple parts, maintaining the low-cost production goal while enabling easy removal.
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 design enhances user confidence in deep insertion and proper seating, ensuring effective sound blocking and easy removal, while supervisors can verify correct installation through the visible string loop.
Implementation Method 1
The earplug body often is formed of a slow recovery foam that can be compressed to a small diameter for deep insertion before returning to its original diameter
Data Source
AI summary
An earplug for blocking sound can be installed uniformly deep in a person's ear canal and can be easily withdrawn. The earplug includes a foam cylinder (12) and a string (14) extending in a loop from the rear of the cylinder, with opposite front ends (32, 34) of the string loop projecting into the body and held therein as by adhesive (38).