| 摘要 |
A head protection unit in the form of a helmet made of composite plastic materials. The helmet is formed of a unitary plastic molding having a wall with an outer shell portion joined to an inner shell portion along the lower edge of the helmet and containing a core portion between the inner and outer shell portions which core portion is made of cellular plastic material. Combinations of flexible and rigid plastic resins may be employed for the shell portions and the core portion. Fittings for attaching a chin strap, goggles or face protector may be secured to the peripheral portions of the composite molding after the molding is produced or as inserts disposed in the mold during the molding procedure. In one form, the inner shell portion is made of a flexible plastic and is ribbed or corrugated. In another form, the core portion is made of two different cellular plastic materials, one more rigid than the other to provide impact resistance.
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