| 摘要 |
PROBLEM TO BE SOLVED: To facilitate insertion and withdrawal of a filter unit to the face body of a dustproof mask. SOLUTION: In a dustproof mask 1 consisting of a face body 2 and an attachable/detachable filter unit 3, an annular seat 7 constituting the face body 2 is formed so as to be able to insert and withdraw a cylindrical inserting part 16 of the filter unit 3. A rotatable annular member constituting the seat 7 is energized in the peripheral direction. When the annular member is rotated against the energization under a condition where the hooking projection 17 of the filter unit 3 is fitted to the recessed cut part 21 of the annular member, the hooking projection 17 of the filter unit 3 is moved to the first recessed part of the cylindrical member fixed on the face body 2 from the recessed cut part and the annular member is rotated in the above described energizing direction to prevent the filter unit 3 from being pulled out. |
