| 摘要 |
Safety helmet for motor-cyclists, (etc.,) provided at the top of the cap portion with at least one air, inlet (3) above which is affixed an aerodynamically, shaped guide fin (4). The air flow under the guide fin (4) produces a vacuum in the helmet and hence ventilates the air inside. Between said aerodynamic guide fin (4) and the external surface of the cap an adjustable sliding element (5) is provided, which is suitably shaped and positioned so as to act both as a baffle plate and as a shutter for controlling said air flow.
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