| 摘要 |
PROBLEM TO BE SOLVED: To position and fix a cap to a head firmly and easily without requiring the work of a head body. SOLUTION: The dust preventive cap is to be detachably mounted on the head 19 disposed at the distal end of piping. The dust preventive cap comprises a cap body 2 mounted on a head releasing part 10, ring-shaped first and second fixing parts 4 and 5 to be separately fixed at two positions in the piping, a first band part 6 connecting the first and second fixing parts 4 and 5 and a second band part 7, one end of which is connected to either the second fixing part 5 or the first band part 6 and the other end of which is connected to the cap body 2. These members are integrally formed of a flexible material. COPYRIGHT: (C)2006,JPO&NCIPI
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