Importance

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Abstract

The constituent parts of a semiclosed respirator (1) are all set in a housing (2). When a push button (616) of a mouthpiece unit (6) is pressed with a chewing piece (617) held between upper end lower teeth, the supplying of a gas to be inhaled, which flows at a predetermined flow rate, through a gas supply pipe (84) is started. When an control lever (633) is pressed, a large quantity of gas is supplied through a gas supply pipe (85), end the removal of water from the mouthpiece unit is carried out. A carbon dioxide adsorption device (7) is of a so-called cartridge type held detachably in a container (3), and can be replaced by a new one easily. A large quantity of gas is supplied automatically in an emergency from a gas supply pipe (86) to an inhalation air passage (32), and an auto-valve mechanism (12) adapted to discharge a gas automatically when the inner pressure of the respiration passage has increased is provided thereon. An expiration air bag (9) is provided at its bottom portion with a drainage means, in which a draining action is made automatically via a water discharge port (96) in accordance with a respiration action. According to the present invention, a semiclosed respirator of a high safety which can be used conveniently even by a beginner can be provided.

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First Claim