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Local external communication system

  • US 4,508,936 A
  • Filed: 05/06/1982
  • Issued: 04/02/1985
  • Est. Priority Date: 07/16/1980
  • Status: Expired due to Term
First Claim
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1. A combined mask and local external communication system adapted to be applied to said mask as a retrofit including in combination a mask adapted to enclose the mouth of a wearer and having a wall of generally uniform thickness comprising a portion with continuous inner and outer surfaces, an assembly comprising a first coil and a microphone, means for adhering said assembly to the inner surface of said mask wall portion without piercing said wall, means including said microphone for producing a first electrical signal in response to the wearer'"'"'s voice, means for applying said first electrical signal to said first coil to cause said first coil to produce a magnetic flux passing through said mask, a second coil, means for adhering said second coil to the outer surface of the mask wall portion without piercing said wall and at a location at which it is subjected to the action of said flux to produce a second electrical signal representative of the voice of the wearer without adversely affecting the integrity of the mask, a speaker carried on the person of the wearer, and means for applying said second signal to said speaker.

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