| 摘要 |
A safety helmet comprising a shell and a chin-strap associated thereto, the one chin-strap end being rotatably mounted on a pivot fastened to the shell, the other chin-strap end being joined to the shell through a control member rotatably mounted on a pivot fastened to the shell, and so arranged as to move the chin-strap between two end positions, a first position allowing either fitting the helmet on, or removing the head therefrom, wherein the chin-strap projects in front of the chin to make the helmet opening completely free, and a second position corresponding to securing the helmet, wherein that chin-strap portion intended to bear under the chin to secure the helmet, is bearing underneath the chin.
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