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Earplug for noise protected communication between the user of the earplug and surroundings

  • US 4,975,967 A
  • Filed: 05/22/1989
  • Issued: 12/04/1990
  • Est. Priority Date: 05/24/1988
  • Status: Expired due to Term
First Claim
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1. An earplug intended for insertion in an ear canal and intended to allow the user of the earplug, by means of two separate acoustic systems consisting of an earphone unit suitable for monitoring and a microphone unit, to engage in both simplex and duplex communication with another person in noisy surroundings, comprising:

  • (a) a body having a size and shape adapted to fit within the ear canal, an inner end, an outer head and a longitudinal channel passing through the body from the inner end to the outer head; and

    (b) a pair of collars surrounding the body which when the earplug is in the ear canal are sized and positioned to make contact with a wall of the ear canal and are spaced apart to create a cavity defined by the collars, a surface portion of the body between the collars and the ear canal wall;

    said body also having at least one cavity channel running from the outer head to the surface of the portion of the body between the collars.

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