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Respiratory equipment with comfort adjustment

  • US 5,623,923 A
  • Filed: 06/06/1995
  • Issued: 04/29/1997
  • Est. Priority Date: 06/09/1993
  • Status: Expired due to Term
First Claim
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1. Head respiratory equipment comprising:

  • a respiratory mask adapted to be fit against the face of a user and provided with a demand regulator with air dilution, connectable to a pressurized respiratory gas source;

    an extensible harness having end portions connected to said mask and including an element 16 inflatable by the respiratory gas for being stretched up to a sufficient size for enabling the user to don it over the head,manually controlled means for delivering said pressurized respiratory gas from said source into the inflatable element for stretching it and to allow the pressure to decrease in said element for enabling the harness to contact the head and forcibly apply the mask onto the face of the user, andpressure control means for automatically admitting pressurized gas into a compound of the harness, from the respiratory gas source, and for exhausting pressurized gas from said compound to atmosphere, comprising;

    a housing securely connected to said mask, formed with a bore;

    a plunger slidably received in said bore and secured to said end portions; and

    comfort mask selection means comprising a valve member manually movable between a comfort position where it is apt to communicate a first passage opening into said bore with atmosphere and it communicates a second passage opening into said bore at a distance from said first passage with an inlet connectable to said source and another position where it is apt to communicate said first and second passages simultaneously to atmosphere;

    wherein said plunger is formed with a third passage opning into said resilient element and is arranged to separate said third passage from said first and second passages when in a mid-position in said bore, to communicate said third passage and said first passage when said plunger is moved along said bore from said mid-position in a predetermined direction past a predetermined position and for communicating said second and third passages when said plunger is moved in an opposite direction past another predetermined position.

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