| 摘要 |
A lightweight molded protective helmet for use by cyclists and preferably produced by stretch-blow molding a moldable plastic material. The helmet includes outer and inner shells or surfaces each having a plurailty of openings therein, with the surfaces being connected together by walls of the openings formed integral with the surfaces of the helmet. The openings in the helmet surfaces can have any shape such as circular or elongated, and can be made substantially perpendicular or inclined to the surfaces. Also if desired, the space between the substantially parallel outer and inner surfaces can be filled with a plastic energy-absorbing foam material to provide a composite helmet construction.
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