| 摘要 |
A motorcyclist's or bicyclist's helmet has dome shaped top wall structure, side wall structures, a front opening for forward viewing, a lower front wall structure which juts forwardly, and rear wall structure; and it also includes: (a) a frontward facing air inlet defined by the lower front wall structure, (b) passage structure in the helmet to receive air inflow from the inlet for circulation to different portions of the interior of the helmet and subsequent flow to the helmet exterior, and (c) a closure carried by the helmet front wall for movement adjustably controlling said passage structure. In addition, the helmet typically includes a shield, and said passage structure includes a primary passage to direct inflowing air toward the inner side of the shield, and a secondary passage to direct inflowing air rearwardly toward the interior of the helmet.
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