Breathing apparatus

Claim 1

IN COMBINATION WITH AN OXYGEN DEMAND REGULATOR HAVING MEANS OPERATIVELY PULSATING AT INTERVALS COMMENSURATE WITH THE USER''S BREATHING RATE, MEANS OPERATING EMERGENCY OXYGEN EQUIPMENT WHEN THE INTERVALS EXCEED A PREDETERMINED TIME AND COMPRISING AN ACTIVATOR FOR SAID EQUIPMENT MOVABLE BETWEEN PRE-ACTUATION AND ACTUATION POSITIONS, MEANS URGING THE ACTIVATOR TO MOVE FROM ITS PRE-ACTUATION POSITION TO ITS ACTUATION POSITION AND ACTIVATE THE EMERGENCY OXYGEN EQUIPMENT, MEANS RESPONSIVE TO EACH PULSATION OF THE REGULATOR TO PLACE THE ACTIVATOR IN ITS PRE-ACTUATION POSITION AND DELAY RELEASE OF THE ACTIVATOR FROM ITS PRE-ACTUATION POSITION FOR A GIVEN PERIOD LESS THAN SAID PREDETERMINED TIME, MEANS FOR RETARDING MOVEMENT OF THE ACTIVATOR TOWARD ITS ACTUATION POSITION FOLLOWING SAID GIVEN PERIOD SUCH THAT THE NEXT SUCCEEDING PULSATION OF THE REGULATOR CAUSES THE MOVEMENT OF THE ACTIVATOR TOWARDS THE ACTUATION POSITION TO BE INTERRUPTED AND THE ACTIVATOR PLACED IN ITS PRE-ACTUATION POSITION UNLESS THE INTERVALS SEPARATING SAID PULSATION ESCEEDS THE SAID PREDETERMINED TIME, AND MANUAL SWITCH MEANS FOR SELECTIVELY DEACTIVATING THE EMERGENCY OXYGEN EQUIPMENT DURING THE INTERVALS EXCEEDING THE SAID PREDETERMINED TIME.