| 摘要 |
A face mask for use in an unbreathable atmosphere or beneath the surface of water and intended for connection to a breating gas container or to an air purifier. The mask includes a pliable sealing facepiece (1) which is intended to be pressed sealingly against the wearer's face, a framed viewing visor inserted in and sealingly connected to the pliable facepiece (1), and straps (8, 9) for securing the face mask to the head of the wearer. The straps are fastened in the frame (3) of the visor (2) such that the frame (3) will exert pressure on the sealing facepiece (1) when the straps (8, 9) are tightened on the wearer's head. |
