Helmets including spray on materials
Various embodiments of helmets and methods of their manufacture are disclosed. In some embodiments, the helmet includes a helmet shell having a helmet shell edge and/or a mounting location for mounting an accessory to the helmet shell. A material that is adherent to the helmet shell may be sprayed onto the helmet shell edge of the helmet shell to form a trim. Alternatively, the material may be sprayed onto a portion of the helmet shell associated with either a mounting location for mounting an accessory or a position for a mounted accessory.
1. A method of manufacturing a helmet, the method comprising:
spraying a material onto a helmet shell edge of a helmet shell to form a trim along the helmet shell edge, wherein the trim formed along the helmet shell edge covers the helmet shell edge and a portion of each of an exterior surface of the helmet shell and an interior surface of the helmet shell adjacent to the helmet shell edge, and wherein an adjacent portion of the interior surface and an adjacent portion of the exterior surface is free of the material.
2. The method of claim 1 , wherein the material comprises a polymeric material.
3. The method of claim 2 , wherein the polymeric material comprises at least one of polyurethane and polyurea.
4. The method of claim 2 , wherein the polymeric material cures after it is sprayed on the helmet shell.
5. The method of claim 1 , wherein spraying the material further comprises spraying a mixture of a polymeric resin and an activator.
6. The method of claim 5 , further comprising mixing the mixture of the polymeric resin and the activator during spraying.
7. The method of claim 1 , further comprising masking a portion of the helmet shell prior to spraying the material to limit application of the material to only form the trim along the helmet shell edge.
8. The method of claim 7 , wherein masking the portion of the helmet shell includes masking an interior portion of the helmet shell and masking an exterior portion of the helmet shell at the same time.
9. The method of claim 7 , wherein masking the portion of the helmet shell includes masking the portion of the helmet shell with a collapsible mask.
10. The method of claim 1 , further comprising applying an intermediate non-adhesive layer to an underlying base material of the helmet shell prior to spraying the material onto the helmet shell.
11. The method of claim 1 , further comprising:
spraying a material onto a portion of an exterior surface of a helmet shell associated with either a mounting location for mounting an accessory or a position for a mounted accessory, wherein a coefficient of friction of the material is greater than a coefficient of friction of an adjacent portion of the exterior surface of the helmet shell free of the material, wherein the material comprises a polymeric material, and wherein the polymeric material cures after it is sprayed on the helmet shell.
12. The method of claim 11 , wherein the polymeric material comprises at least one of polyurethane and polyurea.
13. The method of claim 11 , further comprising applying an intermediate non-adhesive layer to an underlying base material of the helmet shell prior to spraying the material onto the helmet shell.
14. The method of claim 1 , wherein spraying the material onto the helmet shell includes spraying a continuous layer of material onto the helmet shell edge, the portion of the interior surface of the helmet shell, and the portion of the exterior surface of the helmet shell.
15. The method of claim 14 wherein spraying the continuous layer onto the helmet shell conforms the material to a shape of the helmet shell without a seam line.
16. The method of claim 1 , wherein the helmet shell includes a mounting location for mounting an accessory separate from the trim, and further comprising spraying the material onto the exterior surface of the helmet shell at the mounting location, and wherein an adjacent portion of the exterior surface of the helmet shell surrounding the mounting location is free of the material.
17. A method of manufacturing a helmet, the method comprising:
assembling an inner mask to an interior surface of a helmet shell;
assembling an outer mask to an exterior surface of the helmet shell; and
spraying a material onto a helmet shell edge, an unmasked portion of the interior surface, and an unmasked portion of the exterior surface of the helmet shell while the inner mask and the outer mask are assembled with the helmet shell at the same time to form a trim along the helmet shell edge.
18. The method of claim 17 , wherein the trim formed along the helmet shell edge covers the helmet shell edge and a portion of each of an exterior surface of the helmet shell and an interior surface of the helmet shell adjacent to the helmet shell edge without a seam line.
19. The method of claim 18 , wherein an adjacent portion of the interior surface and an adjacent portion of the exterior surface is free of the material.
20. The method of claim 17 , wherein the material comprises a polymeric material.
21. The method of claim 20 , wherein the polymeric material cures after it is sprayed on the helmet shell.
22. The method of claim 17 , wherein spraying the material onto the helmet shell includes spraying a continuous layer of material onto the helmet shell edge, the unmasked portion of the interior surface of the helmet shell, and the unmasked portion of the exterior surface of the helmet shell.
23. The method of claim 17 , wherein the helmet shell includes a mounting location for mounting an accessory separate from the trim, and further comprising spraying the material onto the exterior surface of the helmet shell at the mounting location, and wherein an adjacent portion of the exterior surface of the helmet shell surrounding the mounting location is free of the material.