| 摘要 |
Provided is a ratchet buckle for helmets wherein an engagement/releasing member having an engagement part is assembled to the buckle, via a pin, between the base member and operating member, and therefore when the operating member is pulled up and rotated in the counterclockwise direction, the front end of the operating member contacts the front end of the engagement/releasing member and the engagement with the tab of the ratchet is released by rotation of the engagement part of the engagement/releasing member, and because the engagement is released by pulling up the operating member by at least twice the conventional pull-up distance, the helmet will not come off from the head as a result of a wrong or inadvertent lever operation and thus safety can be ensured, while the thickness of the ratchet buckle can be kept small. |
