| 摘要 |
PROBLEM TO BE SOLVED: To detect an unsatisfactory attached state of a front mask.SOLUTION: A front mask 53 is attached to the front end face of an inner housing 22. A lock pawl 58 is formed on the front mask 53 and is bent and deformed in the course of being attached to the inner housing 22. Upon attached, the lock pawl 58 returns from the bent state and locks into a locking recessed part 59. If the attached state of the front mask 53 is unsatisfactory and the lock pawl 58 remains bent, the detection part 65 of a retainer 61 interferes with the bent lock pawl 58 and hinders the retainer 61 from reaching an actual lock position when the retainer 61 is moved from a temporary lock position to the actual lock position. Accordingly this makes an operator aware that the attached state of the front mask 53 is unsatisfactory. |
