| 摘要 |
The crash helmet comprises an automatic opening and closing system of the visor which takes advantage of the pressure exerted by the air. A return spring maintains the visor (9) in its maximum aperture position when no external force is acting on it. When the velocity increases the pressure exerted by the air progressively rotates downwards the visor. The crash helmet also comprises a ventilation system (50, 60) which makes use of a minimum number of slits or holes on the shell, thereby lowering in a noticeable manner the noise inside the crash helmet when the ventilation system is not operating. Lastly the crash helmet comprises an internal stuffing means (67) which is extremely practical with regard to its cleaning and its adaptation to the particular form of the head, and which is also characterized in that it provides regions for the free circulation or air inside the crash helmet.
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