Omnidirectional energy management systems and methods
Systems and methods of a safety helmet for protecting the human head against repetitive impacts, moderate impacts and severe impacts so as to significantly reduce the likelihood of both translational and rotational brain injury and concussions can be provided. The helmet can include an outer shell, an outer liner disposed within and coupled to the outer shell, and an inner liner disposed within and coupled in spaced opposition to the outer liner. A polymer liner can be coupled to the inner liner and can at least partly separate the outer liner and the inner liner. Pads and dampers can also couple the outer liner and inner liner and provide for and control omnidirectional movement of the liners relative to each other.
1. A helmet comprising:
an outer shell;
a first liner disposed within and coupled to the outer shell, the first liner comprising a first protrusion with a first end disposed on a side of the first liner facing away from the outer shell;
a second liner comprising a first material and disposed within and coupled to the first liner; and
a polymer liner comprising a second material different from the first material, coupled to the second liner, and disposed between the first liner and the second liner.
2. The helmet of claim 1 , wherein the first liner further comprises a second protrusion facing the second liner.
3. The helmet of claim 1 , wherein the first liner comprises the first material.
4. The helmet of claim 1 , wherein the first liner comprises a third material.
5. The helmet of claim 1 , further comprising an air gap between the first liner and the second liner and/or the polymer liner.
6. The helmet of claim 5 , further comprising a compressible structure coupled to the first liner and/or the second liner and disposed within at least a portion of the air gap.
7. The helmet of claim 1 , further comprising a damper comprising a first damper end coupled to the first liner.
8. The helmet of claim 7 , further comprising a carrier coupled to the second liner, wherein a second damper end of the damper is coupled to the carrier.
9. The helmet of claim 8 , wherein the carrier is in-molded or co-molded to the second liner.
10. The helmet of claim 1 , wherein the outer shell, the first liner, and/or the second liner each comprise a rear cutout configured to be in alignment with a cervical area of a wearer of the helmet.
11. The helmet of claim 1 , further comprising a third liner disposed within and coupled to the second liner.
12. The helmet of claim 1 , wherein the first liner and/or the second liner are multi-section liners.
13. A method of manufacturing the helmet of claim 1 , the method comprising:
coupling the polymer liner to the second liner to form a liner assembly;
coupling the liner assembly to the first liner; and
coupling the first liner to the outer shell.
14. The method of claim 13 , further comprising coupling a carrier to the first liner via a damper.
15. The method of claim 13 , wherein the coupling the polymer liner to the second liner comprises co-molding the second liner and the polymer liner to form the liner assembly.
16. The helmet of claim 6 , wherein the compressible structure is coupled to the first liner and/or the second liner via an elastomeric band.
17. The helmet of claim 2 , further comprising a first pad coupled to the first end of the first protrusion, wherein a first coefficient of friction between the first pad and the polymer liner is less than a second coefficient of friction between the second protrusion and the polymer liner.
18. The helmet of claim 1 , wherein the second material comprises a second modulus of elasticity higher than a first modulus of elasticity of the first material, wherein the second liner comprises a first thickness and the polymer liner comprises a second thickness, and wherein the first thickness is thicker than the second thickness.
19. The helmet of claim 1 , further comprising a first pad coupled to the first end of the first protrusion.
20. The helmet of claim 2 , wherein the first protrusion is configured to contact the polymer liner when the helmet is in an unloaded position and the second protrusion is configured to not contact the polymer liner and/or the second liner when the helmet is in the unloaded position.