| 摘要 |
A ring band adjustment structure of a crash helmet comprises a ring band, a connection sheet, a guide bar, and a pair of locating adjusters. Two ends of the ring band are connected to the locating adjusters. The locating adjusters ar e connected to the guide bar so that the locating adjusters can move along a guide track formed at the edge of the guide bar. Through a control element in a slide grooves of the locating adjuster, a point-shaped unidirectional locating element on the bottom face of the inner end of the control element will leave from a corresponding strip-shaped unidirectional locating element of the locating b ar on the guide bar, and the locating adjuster can move. Each end of the guide bar has a limit element so that the locating adjuster will not slide out.</SDOAB >
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