Breathing bag system for closed circuit breathing apparatus

DETAILED DESCRIPTION What is claimed is: 1.
A breathing bag system for a breathing apparatus having a source of oxygen comprising; a relatively thin high strength plastic exhalation bag for receiving and storing gas exhaled by a user, said exhalation bag having an outer surface area of from 600 to 2,000 square centimeters and an interior volume of from 1 to 3 liters; carbon dioxide absorbing means coupled to said exhalation bag for removing carbon dioxide from exhaled gas within said exhalation bag and providing a breathable gas; said exhalation bag having an inlet port adapted to be directly connected to the source of oxygen to receive oxygen directly from the source of oxygen in said exhalation bag; a relief valve on said exhalation bag for relieving built-up pressure within said exhalation bag; and an inhalation bag of a relatively thin plastic having good heat transfer characteristics and coupled to said carbon dioxide absorbing means for receiving and storing the breathable gas from said carbon dioxide absorbing means and providing the stored breathable gas to the user, said inhalation bag having a larger interior volume than said exhalation bag and having an interior volume of from 3 to 5 liters and an outer surface area of from 1,500 to 4,000 square centimeters.




Description:
BACKGROUND OF THE INVENTION This invention relates to breathing bag systems for a closed circuit breathing apparatus and more particularly, to breathing bag systems for use with breathing hoses, a chemical oxygen generator and a carbon dioxide absorption system.
In the event of a fire, a factory accident, a coal mine accident or an oxygen deficiency accident, an antitoxic mask is not effective for protecting the user.
To provide a personal breathing apparatus effective under such circumstance, various types of breathing apparatus comprising a self-contained oxygen source have been proposed.
Most of them utilize an oxygen bottle or a compressed air bottle as an oxygen source.
Although oxygen bottles are more often used because they supply high-purity oxygen gas quite handily, they must be handled and stored with special care