Underwater breathing apparatus

An underwater breathing apparatus for supplying air to a submerged diver, comprising:

• a) a first reservoir bag used at or above the surface of the water having an inlet and an outlet capable of maintaining a plurality of gauge pressures suitable to provide breathable air to a diver at a depth from about 4 feet up to about 12 feet;
• b) a floatable variable-pressure second reservoir bag having an inlet and an outlet;
• c) an air hose for delivering pressurized air from said first reservoir bag to said floatable variable-pressure second reservoir bag, said hose being connected at one end to said first reservoir bag outlet and at the other end to said floatable variable-pressure second reservoir bag inlet;
• d) a manually operated pump connected to said first reservoir bag inlet via an air hose for delivering air under pressure to said first reservoir bag;
• e) a pressure gauge for measuring the air pressure in said first reservoir bag to allow the pump to be selectively operated in response to bag pressure variations in order to maintain said air pressure within a selected range;
• f) a breathing means worn by said diver for receiving air from said floatable variable-pressure second reservoir bag;
• g) an air hose for delivering air from said floatable variable-pressure second reservoir bag to said diver, said hose being connected at one end to said floatable variable-pressure second reservoir bag outlet and at the other end to said diver breathing means;
• and
• h) a pressure release means on said first reservoir bag, said means being activated at selected bag pressure levels to relieve air pressure in said first reservoir bag above said pressure levels.

An underwater breathing apparatus for supplying air to a submerged diver, comprising:

• a) a floating first reservoir bag having an inlet and an outlet capable of maintaining a plurality of gauge pressures from about 1.7 psi up to about 6 psi;
• b) a floatable variable-pressure second reservoir bag having an inlet and an outlet;
• c) an air hose for delivering pressurized air from said first reservoir bag to said floatable variable-pressure second reservoir bag, said hose being connected at one end to said first reservoir bag outlet and at the other end to said floatable variable-pressure second reservoir bag inlet;
• d) a manually operated pump connected to said first reservoir bag inlet via an air hose for delivering air under pressure to said first reservoir bag;
• e) a pressure gauge for measuring the air pressure in said first reservoir bag to allow the pump to be selectively operated in response to bag pressure variations in order to maintain said air pressure within a selected range;
• f) a breathing means worn by said diver for receiving air from said floatable variable-pressure second reservoir bag.

An underwater breathing apparatus for supplying air to a submerged diver, comprising:

• a) a first reservoir bag used on a dry surface having an inlet and an outlet capable of maintaining a plurality of gauge pressures from about 1.7 psi up to about 6 psi;
• b) a floatable variable-pressure second reservoir bag having an inlet and an outlet;
• c) an air hose for delivering pressurized air from said first reservoir bag to said floatable variable-pressure second reservoir bag, said hose being connected at one end to said first reservoir bag outlet and at the other end to said floatable variable-pressure second reservoir bag inlet;
• d) a manually operated pump connected to said first reservoir bag inlet via an air hose for delivering air under pressure to said first reservoir bag;
• e) a pressure gauge for measuring the air pressure in said first reservoir bag to allow the pump to be selectively operated in response to bag pressure variations in order to maintain said air pressure within a selected range;
• f) a breathing means worn by said diver for receiving air from said floatable variable-pressure second reservoir bag.

An underwater breathing apparatus for supplying air to a submerged diver, comprising:

• a) a reservoir bag at or above the surface of the water having an inlet and an outlet capable of maintaining a plurality of gauge pressures up to about 6 psi;
• b) breathing means worn by said diver for receiving air from said reservoir bag;
• c) an air hose for delivering air from said reservoir bag to said diver, said hose being connected at one end to said pressurized reservoir bag outlet and at the other end to said diver breathing means;
• d) motor-driven pump means connected to said reservoir bag inlet via an air hose for delivering air under pressure to said pressurized reservoir bag whereby a pressure between about 1.7 and about 6 psi may be maintained in said reservoir bag;
• and
• e) means connected to said pump means for maintaining the air pressure in said reservoir bag within a selected range and automatically operating said pump means in response to pressure variations in said reservoir bag.

An underwater breathing apparatus for supplying air to a submerged diver comprising:

• a) a pressurized reservoir bag at or above the surface of the water having an inlet and an outlet capable of maintaining a plurality of gauge pressures up to about 6 psi;
• b) breathing means worn by said diver for receiving air from said reservoir bag;
• c) an air hose for delivering air from said reservoir bag to said diver, said hose being connected at one end to said pressurized reservoir bag outlet and at the other end to said diver breathing means;
• d) manually-operated pump means connected to said reservoir bag inlet via an air hose for delivering air under pressure to said pressurized reservoir bag whereby a pressure between about 1.7 and about 6 psi may be maintained in said reservoir bag;
• e) a motor-driven pump connected to said pressurized reservoir bag inlet;
• f) pressure sensitive means connected to said motor-driven pump for automatically operating said motor-driven pump as an alternative to said manual pump in response to variations in reservoir air pressure.

An underwater breathing apparatus for supplying air to a submerged diver, comprising:

• a) a reservoir bag at or above the surface of the water having an inlet and an outlet capable of maintaining a plurality of gauge pressures suitable to provide breathable air to a diver at a depth of from about 4 feet up to about 12 feet;
• b) breathing means worn by said diver for receiving air form said reservoir bag;
• c) an air hose for delivering air from said reservoir bag to the diver, said hose connected at one end to said reservoir bag outlet and at the other end to said diver breathing means;
• d) a manually operated pump connected to said reservoir bag inlet via an air hose for delivering air under pressure to said reservoir bag;
• e) a pressure gauge for measuring the air pressure in said reservoir bag to allow the pump to be selectively operated in response to bag pressure variations in order to maintain said air pressure within a selected range;
• f) pressure release means on said reservoir bag, said means being activated at selected bag pressure levels to relieve air pressure in said reservoir bag above said pressure levels;
• and
• g) a one-way manual squeeze pump on said air hose near said diver for manually forcing air from said hose toward said diver.