Arrangement in breathing apparatus

Claim 1

IN A BREATHING APPARATUS, THE COMBINATION COMPRISING: A CYLINDRICAL CASING DEFINING A VALVE CHAMBER AND INCLUDING AN OPENING AT ONE END THEREOF FOR OPERATIVELY COMMUNICATING THE CHAMBER WITH A SOURCE OF BREATHABLE AIR TO PERMIT FLOW OF THE AIR INTO THE CHAMBER; A MOVABLE FLEXIBLE DIAPHRAGM MOUNTED AT AND CLOSING THE OTHER END OF THE CASING AND HAVING ONE SIDE THEREOF SUBJECTED TO THE AMBIENT MEDIUM AND RESPONSIVE TO THE DIFFERENCE BETWEEN THE PRESSURE OF THE AMBIENT MEDIUM AND THE PRESSURE WITHIN THE CHAMBER; AN INHALATION VALVE COOPERATING WITH SAID OPENING TO CONTROL THE FLOW OF AIR INTO THE CHAMBER; MEANS FOR CONTROLLING THE INHALATION VALVE IN RESPONSE TO MOVEMENT OF THE MEMBRANE; A PARTITION WITHIN THE CASING DISPOSED LATERALLY OF THE CASING AXIS AND HAVING A DIAMETER EQUAL TO THE INNER DIAMETER OF THE CASING, THE PARTITION DIVIDING THE CASING VALVE CHAMBER INTO A FIRST SPACE INCLUDING THE SAID OPENING AND A SECOND SPACE INCLUDING THE MEMBRANE; AN EXHALATION VALVE IN THE SECOND SPACE OPERATIVELY COMMUNICATING WITH THE AMBIENT MEDIUM; A TUBE PERMITTING PASSAGE OF INHALED AIR TO AND EXHALED AIR FROM A WEARER; A COMMUNICATION PORT CONNECTING THE CHAMBER WITH THE TUBE, THE PARTITION BEING SITUATED AT THE COMMUNICATION PORT AND DIVIDING THE PORT INTO A FIRST OPENING COMMUNICATING WITH THE SAID FIRST SPACE AND A SECOND OPENING COMMUNICATIONG WITH THE SECOND SPACE, THE PARTITION FORMING WITH THE FIRST OPENING AN INJECTOR MEANS CAUSING A SUB-PRESSURE IN THE SECOND SPACE UPON PASSAGE OF INHALED AIR THROUGH THE FIRST OPENING, AND THE PARTITION FURTHER DEFINING A HOLE ENABLING A LIMITED FLOW OF AIR DIRECTLY FROM THE FIRST SPACE TO THE SECOND SPACE TO COUNTERACT THE DECREASE IN PRESSURE IN THE SECOND SPACE CAUSED BY THE INJECTED MEANS.