Ecostructural bicycle/activity safety helmet
A safety helmet that provides improved protection against injuries that can result from both linear and angular head acceleration is described. The helmet features an outer shell, an interface structure and a liner. The liner is a matrix structure formed from silkworm cocoons. Minimization of weight and sustainability, without compromising functionality, are also features of the helmet.
1. A protective apparatus comprising:
a helmet comprising an outer shell having an inner surface and an outer surface;
an interface structure located in surface contact with said inner surface; and
an inner liner in surface contact with said interface structure said inner liner comprising a natural silkworm cocoon matrix structure, wherein each element of said matrix structure is a single uncompressed complete cocoon or, one or more uncompressed half cocoons.
2. The protective apparatus, in accordance with claim 1 , wherein said natural silkworm cocoon matrix structure is formed as one or a plurality of layers wherein said plurality is a sandwich of bonded layers, each of said layers comprising a matrix of said silkworm cocoon elements, each of said silkworm cocoon elements bonded to adjacent said silkworm cocoon elements.
3. The protective apparatus in accordance with claim 2 , wherein each of said silkworm cocoon elements is two or more coaxially and conformally seated half cocoons.
4. The protective apparatus, in accordance with claim 2 , wherein the orientation of said cocoons comprising said matrix is arranged to at least partially control the mechanical properties of said inner liner.
5. The protective apparatus in accordance with claim 1 , wherein said inner liner further comprises a filler material between surfaces of said bonded silkworm cocoons wherein the volume fraction of the cocoons is selected to at least partially control the mechanical properties of said inner liner.
6. The protective apparatus, in accordance with claim 1 , wherein said inner liner is removable.
7. The protective apparatus, in accordance with claim 1 , wherein said inner liner is replaceable.
8. The protective apparatus, in accordance with claim 1 , wherein said inner liner is coated with a material having a color contrasting with said inner liner.
9. The protective apparatus, in accordance with claim 1 , wherein said interface structure comprises an ultra-thin, low-friction, easy shear layer.
10. The protective apparatus, in accordance with claim 9 , wherein said easy shear layer is self-lubricating.
11. The protective apparatus, in accordance with claim 9 , wherein said easy shear layer is self-releasing.
12. The protective apparatus, in accordance with claim 1 , wherein said interface structure comprises a layer of shear-thickening fluid.
13. The protective apparatus, in accordance with claim 1 , wherein said interface structure comprises a sacrificial, low friction, easy shear, skin-like coating adhered to said inner surface of said outer shell.
14. The protective apparatus, in accordance with claim 1 , wherein said interface structure comprises a clip-on sacrificial membrane.
15. The protective apparatus, in accordance with claim 1 , wherein said outer shell, said interface structure, and said inner liner is biodegradable.
16. The protective apparatus, in accordance with claim 1 , wherein said outer shell further comprises straps attached to said outer shell and operatively configured to secure said protective helmet to a user's head.
17. The protective apparatus, in accordance with claim 1 , wherein said outer shell is comprised of natural silk fiber reinforced biocomposite formulated to exhibit a non-linear stress-strain relationship.
18. The protective apparatus, in accordance with claim 1 , wherein said outer shell is fabric or leather.