| 摘要 |
A compact multipurpose dustproof mask includes a body pipe (10) having an outlet hole (10b) formed at one end and a mouth contact hole (10a) formed at the other end thereof, and the end where the mouth contact hole (10a) is formed is held in the mouth and/or nose, a backward flow preventing ball (20) installed to be capable of moving back and forth and pressed by a returning means in a direction to block a narrow hole (10d) formed inside the body pipe (10) so that the body pipe (10) can be open/shut according to pressure of internal air, and a branch pipe (30) formed between the mouth contact hole (10a) of the body pipe (10) and the backward flow preventing ball (20), the branch pipe (30) having an inlet hole (30a) having a shape corresponding to a filter (40) formed at one end thereof so that the filter (40) is connected. Thus, the manufacturing cost and the size of a product can be reduced. Also, the mask can be easily carried and kept. |
