Molded articles and molding methods particularly for a protective helmet
View Patent ↗Protective structures, such as helmets, may have a shell including an outer shell and a tunnel element integral to the outer shell. The tunnel element may have a first opening at an outer surface side of the shell and a second opening at an inner surface side of the shell so that air flow may occur between the openings and wherein the tunnel element is fused to the outer shell. An impact liner may be directly in-molded to shells suitable for use in motorcycle helmets and other helmets that must meet certain standards. The impact liner may include one or more venting channels that are coupled to a tunnel integral to the shell structure.
1. A shell for a protective helmet comprising:
an outer shell and a tunnel element integral to the outer shell, the tunnel element having a first opening at an outer surface side of the shell and a second opening at an inner surface side of the shell so that air flow may occur between the openings;
an interface of resinated composite lay-up materials that integrates the tunnel element and the outer shell together; and
wherein the tunnel element comprises a hollow tubular structure running generally longitudinally from a front portion to at least a middle portion of the helmet, so that the tunnel element provides an air tunnel positioned substantially within and integral with the outer shell.
2. The shell of claim 1 wherein the tunnel has a molded inner wall in a unitary structure with the outer shell.
3. The shell of claim 1 wherein the tunnel is a preformed tunnel element that is chemically bonded to a portion of the shell.
4. The shell of claim 2 wherein the shell comprises a molded lay-up of composite material.
5. The shell of claim 4 wherein at least some of the composite materials include prepreg materials.
6. The shell of claim 5 further comprising an impact liner disposed in the interior of the shell.
7. The shell of claim 1 further comprising an impact liner disposed in the interior of the shell.
8. The shell of claim 7 wherein the impact liner comprises a moldable, compressible, impact attenuating polymer material.
9. The shell of claim 8 wherein the impact liner and shell are chemically bonded creating a one-piece shell assembly.
10. The shell of claim 8 wherein the tunnel is coupled to at least one channel formed in the impact liner.
11. The shell of claim 1 wherein the shell comprises a molded composite lay-up.
12. The shell of claim 1 wherein the tunnel comprises a molded composite lay-up.
13. The shell of claim 9 wherein the impact liner comprises EPS or EPP.
14. The shell of claim 9 further comprising an impact absorbing liner that is connected to the shell and into which the tubular element extends.
15. The shell of claim 1 further comprising an impact liner comprising multiple layers or zones of different densities of moldable, compressible impact attenuating polymer material.
16. The shell of claim 5 further comprising an impact liner comprising multiple layers or zones of different densities of moldable, compressible impact attenuating polymer material.
17. The shell of claim 1 wherein the shell comprises at least one of carbon fiber, aramid fiber, fiberglass, polycarbonate, and ABS.
18. The shell of claim 17 wherein the tunnel material comprises at least one of carbon fiber, aramid fiber, fiberglass, polycarbonate, and ABS.
19. The shell of claim 18 wherein the tunnel has a volume of at least approximately 1.0 cubic inch.
20. The shell of claim 17 wherein an impact liner comprising a moldable, compressible impact attenuating polymer material is in-molded directly to at least a portion of the tunnel.
21. A helmet comprising the shell and impact liner of claim 20 , wherein the helmet meets US DOT Standard 218.
22. A shell according to claim 1 wherein the tunnel includes a constriction for providing a Venturi effect.
23. The shell of claim 1 wherein the tunnel is a preformed tunnel element comprising a resinated composite lay-up of materials.
24. The shell of claim 1 wherein the shell comprises a resinated lay-up of composite materials.