| 摘要 |
The helmet shield is provided with a buckling annulus at the inner side of each end portion, spaced catching blocks are provided around each buckling annulus, each catching block is provided with a slant surface, and a protruding rod is provided below each buckling annulus. A pair of fixing pieces are respectively provided to secure to both end portions of the helmet shield. Each fixing piece is provided with an annular catching groove, each annular catching groove is provided with a plurality of hollows and an opening, each hollow is provided with a stopping wall at one side, and the hollows and the opening of each annular catching groove are provided for a buckling member to be assembled. An arc notched portion and an arc sliding groove are provided below each annular catching groove.
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