Safety apparatus for oxygen system

• US 3,092,104 A
• Filed: 04/21/1958
• Issued: 06/04/1963
• Est. Priority Date: 04/21/1958
• Status: Expired due to Term

• Current Assignee: William B. Cassidy
• Original Assignee: William B. Cassidy
• Inventors: Cassidy, William B.
• Application Number:
  US03/729,829
• Time in Patent Office: 1,870 Days
• US Class Current: 128/202.22
• CPC Class Codes: A62B 7/14 for high-altitude aircraft
• CPC Class Codes: A62B 9/00 Component parts for respiratory or breathing apparatus A62B19/00, A62B21/00, A62B23/00 take precedence
• CPC Class Codes: Y10T 137/2012 Pressure

Claims

7. IN COMBINATION WITH AN OXYGEN REGULATOR HAVING A WALL ENCLOSING A DEMAND CHAMBER PROVIDED WITH OUTLET MEANS FOR CONDUCTING OXYGEN FROM THE CHAMBER TO A USER AND FURTHER HAVING AN OXYGEN INLET PASSAGE AND A DEMAND VALVE CONNECTING AND GOVERNING THE FLOW OF OXYGEN BETWEEN SAID INLET PASSAGE AND CHAMBER, A SAFETY DEVICE COMPRISING:

A PORTION OF SAID WALL HAVING AN ORIFICE PROVIDING COMMUNICATION BETWEEN AMBIENT AIR AND SAID DEMAND CHAMBER;

A BELLOWS HAVING A FREE END FACING AND A SECOND END MOUNTED IN FIXED RELATION TO SAID ORIFICE, SAID BELLOWS INCLUDING MEANS BIASING SAID BELLOWS TO A COLLAPSED POSITION, UPON EQUALIZATION OF PRESSURE INTERIORLY AND EXTERIORLY OF SAID BELLOWS, WHEREIN SAID BELLOWS FREE END IS SPACED FROM SAID ORIFICE;

AND MEANS PROVIDING RESTRICTED COMMUNICATION BETWEEN THE INTERIOR OF SAID BELLOWS AND SAID OXYGEN INLET PASSAGE, SAID MEANS BEING DISTINCT FROM SAID DEMAND VALVE AND INCLUDING A METERING OPENING BETWEEN SAID BELLOWS AND SAID INLET PASSAGE SUFFICIENTLY SMALL TO RETARD EQUALIZATION THERETHROUGH OF PRESSURE IN THE BELLOWS INTERIOR AND THE INLET PASSAGE BY A PLURALITY OF SECONDS UPON AN ABRUPT LOSS OF OXYGEN PRESSURE IN THE INLET PASSAGE.