Patent ID: 9578917
Date: 2017-02-28
CPC Classifications: A42B,F41H

Claim:
1. A protective helmet comprising: a cushioning outer multilayer structure comprising two cushioning layers of materials having different densities and different geometric layouts, said cushioning outer multilayer structure having a concave interior surface and a convex exterior surface; a multilayer hard inner structure having a concave interior surface and a convex exterior surface, said concave exterior surface of said hard inner structure attached to said concave interior surface of said cushioning multilayer structure, said multilayer hard inner structure including at least two spaced layers of hard material and a layer of cushioning material therebetween, said hard material being harder than said materials of said two cushioning layers of said outer multilayer structure and being harder than said material of said cushioning material of said multilayer hard inner structure; and an innermost cushioning structure attached to said concave inner surface of said multilayer hard inner structure.