Abstract

The present invention relates to a mouth piece for a breathing apparatus, a breathing apparatus and a method for adjusting a valve trigger mechanism arranged on a mouth piece for a breathing apparatus. The mouth piece according to the present invention comprises a housing comprising a mouth piece breathing part opening for inhaling and exhaling a breathable gas. An inlet port for providing breathable gas into said mouth piece housing, the inlet port being in communication with valve means arranged to open or close said inlet port. The housing further comprises a first exit port for exhausting gas from said housing into a closed circuit flow channel and a second exit port for exhausting gas from said mouth piece housing into an ambient environment. Switch means for selectively directing said exhaust gas between said first exit port and said second exit port to change the mouth piece between open circuit breathing and closed circuit breathing. The switch means is arranged to adjust the valve means so as to provide an automatic diluent valve function in closed circuit mode and an open circuit regulator in open circuit mode. The mouth piece according to the present invention is compact, light weight and provides for a mouth piece which is very simple to handle.

IPC Classes  ?

• B63C 11/24 - Air supply carried by diver in closed circulation
• B62B 9/02 - Accessories or details specially adapted for children's carriages or perambulators providing for travelling up or down a flight of stairs
• B63C 11/22 - Air supply carried by diver

Abstract

The invention is directed to an oxygen sensor arrangement 8 for sensing the oxygen in a breathing loop 29 of a breathing apparatus 100. The sensor arrangement 8 comprises at least one primary oxygen sensor 30 arranged to operatively measure the oxygen in the breathing loop 29, and a control arrangement 40 for obtaining measures from said oxygen sensor. A test channel arrangement 15, 362 is adapted to operatively provide a first gas having a first fraction of oxygen from a first supply 20 to said primary oxygen sensor 30 at a position 267 adjacent to or directly adjacent to said primary oxygen sensor. A first test valve arrangement 41 is arranged to operatively open and close the flow of said first gas through said test channel arrangement 15, 362. Said a control arrangement 40 is arranged to operatively actuate said first test valve arrangement 41 so as to provide an amount of said first gas to said primary oxygen sensor 30 via said test channel arrangement 15, 362.

IPC Classes  ?

• A62B 9/00 - Component parts for respiratory or breathing apparatus
• A61M 16/12 - Preparation of respiratory gases or vapours by mixing different gases
• B63C 11/24 - Air supply carried by diver in closed circulation

Abstract

The invention is directed to an oxygen sensor arrangement (8) and a method for operating such an arrangement for sensing the oxygen in a breathing loop (29) of a breathing apparatus. The sensor arrangement comprises : at least one primary oxygen sensor (30) arranged to operatively measure the oxygen in the breathing loop (29), at least a secondary oxygen sensor (31) arranged to operatively measure the oxygen in the breathing loop (29), and a control arrangement (40) for obtaining measures from said oxygen sensors. A test channel arrangement (15, 48) is adapted to operatively provide a first gas having a first fraction of oxygen from a first gas supply (16) to said primary oxygen sensor (30) at a position (267) adjacent to said primary oxygen sensor (30). At least a first test valve arrangement (41, 42) is arranged to operatively open and close the flow of said first gas through said test channel arrangement (15, 48). Said control arrangement (40) is arranged to operatively actuate said first test valve arrangement (41, 42) so as to provide an amount of said first gas to said primary oxygen sensor (30) via said test channel arrangement (15, 48). Said control arrangement is arranged to operatively obtain measures from said primary (30) and secondary (31) oxygen sensors.

IPC Classes  ?

• A62B 9/00 - Component parts for respiratory or breathing apparatus
• A61M 16/12 - Preparation of respiratory gases or vapours by mixing different gases
• B63C 11/24 - Air supply carried by diver in closed circulation