Importance

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Abstract

A mouth piece unit (6) for a semi-closed type breathing device (1) in which when pressing down a start button (102), the entirety of a movable assembly (70) moves and an external opening (73) opens, whereby a mouth piece (62) is caused to protrude, allowing a diver to hold it in his/her mouth. Since the movable assembly (70) is held at that position even if the start button (102) is restored, an inhalation gas supply valve (21) is held in an open state by an engagement bar (74), whereby the supply of inhalation gas is continued. When the mouth piece (62) comes out of the mouth of the diver, the movable assembly (70) is restored and the external opening (73) is automatically closed, thereby preventing water from entering the inside therethrough from the outside. To drain water, when the start button (102) is kept pressed down, purge gas is supplied from a purge gas supply valve (22), a water draining opening (120) opens, and a breathing air hose connecting port (61a) is closed, this allowing water to be automatically drained. Thus, it is possible to realize a mouth piece unit for a semi-closed type breathing device that can easily be used by a novice.

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First Claim