FACIAL MASK WITH UNIDIRECTIONAL STOPPER Russian patent published in 2012 - IPC A62B18/10 

FIELD: rescue equipment.

SUBSTANCE: invention relates to facial masks, including unidirectional stopper. Facial mask contains: casing and unidirectional stopper. The mask casing is adapted to fit on the nose and mouth of the user and determines the internal gas space. The unidirectional stopper provides gas communication between the internal gas space and the outer gas space. The stopper includes: the base and the stopper shutter. The base attached to the casing of the mask contains an opening surrounded by a seal. The stopper shutter is located above the opening, and contains a fixed part, a moving part and the loop. The loop is located between the fixed part and moving part. The stopper shutter is arranged to be in the closed position in which the shutter is in contact with the surface of the seal. The shutter is adapted to be in the open position, wherein the said moving part of the stopper shutter moves away from the sealing surface, and the gas can pass between the internal gas space and the outer gas space. The loop consists of one or more loop slots formed in the stopper shutter, and one or more isthmuses, through which the movable part of the stopper shutter is connected to the fixed part of the stopper shutter.

EFFECT: development of the face mask comprising a unidirectional stopper.

8 cl, 14 dwg