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Linkage for the demand regulator of a breathing apparatus

  • US 4,029,120 A
  • Filed: 06/30/1975
  • Issued: 06/14/1977
  • Est. Priority Date: 09/23/1974
  • Status: Expired due to Term
First Claim
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1. In a demand regulator for a breathing apparatus, the improvement comprising;

  • a flow valve for controlling the flow of breathable gas from a source to a mouthpiece, said flow valve having a control element extending therefrom, anda diaphragm for sensing inhalation demand and a linkage between said diaphragm and said flow valve control element, said linkage comprising;

    a rigid ball restrained for movement only along a single axis, said element being in contact with said ball,a fixed member having a convex arcuate surface facing said ball on the side opposite said element, anda lever member situated between said ball and, said arcuate surface and linked to said diaphragm so that displacement of said diaphragm causes said lever member to pivot about said arcuate surface, therby moving said ball along said axis and imparting movement to said control element to operate said flow valve.

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