Importance

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Abstract

A mouthpiece unit (6) of a semiclosed-circuit breathing apparatus (1) includes a inhaled/exhaled air circulation chamber (61), an inhalation gas supply opening (71) for providing a constant flow of fresh breathing gas from a breathing gas cylinder, a mouthpiece (62) attached to an external opening (65), and manually operated members (75, 76) that are maintained at an initial position by a resilient force and can be moved to a first operating position against the resilient force. In an interlocking operation, movement of the manually operated members to the first operating position is accompanied by opening of an external opening (65) by a valve (101). A first lever (73) opens and closes the gas supply opening (71) in conjunction with the opening and closing operation of the valve (101). A latch lever (105) is engaged with the valve (101) when the valve (101) is in the open state, and maintains this engagement to thereby maintain the valve (101) in an open state as long as the diver holds the latch lever (105) in his or her mouth. If the latch lever (105) comes out of the mouth, the external opening valve (101) and gas supply opening (71) close automatically.

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First Claim