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Earplug with form-fitting fluid chambers

  • US 5,483,027 A
  • Filed: 08/24/1994
  • Issued: 01/09/1996
  • Est. Priority Date: 08/24/1994
  • Status: Expired due to Fees
First Claim
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1. An ear protective device comprising:

  • an outer body defining two resiliently expansible and collapsible fluid chambers;

    a quantity of fluid sealed within said outer body;

    an elongated relatively rigid core member extending within said outer body and serving to facilitate insertion of at least one of said fluid chambers into an ear canal;

    a passageway defined between said two fluid chambers for selectively placing said fluid chambers in fluid communication with each other;

    a two-way pressure responsive valve adjacent said passageway operative to close off said passageway and thereby isolate said fluid chambers from each other so as to maintain an equilibrium condition with one of said chambers expanded and the other of said chambers substantially collapsed, said valve being further operative to temporarily open said passageway when an expanded one of said fluid chambers is squeezed, thereby collapsing said expanded chamber and allowing the fluid therein to pass into and expand the other chamber.

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