| 摘要 |
To still further simplify an operation for engaging and disengaging from a fitting portion and a projection, while steadily maintaining the fully closed position of a shield. A locking mechanism is provided that includes an operating element that, when a shield is in a fully closed position, holds the shield, from the outside, against the outer wall of a helmet main body, and that, to open the shield, spreads out the shield and disengages a projection from a fitting portion.
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