Microlattice ballistic helmet pads

Abstract

A helmet pad includes a substrate having first side attachable to an interior surface of a helmet. The helmet pad includes an outer lattice layer peripherally attached to a second side of the substrate. The second side is opposite to the first side. In one embodiment, the outer lattice layer includes fibers attached in one of: (i) a Voronoi lattice unit cells; and (ii) tetrahedral lattice unit cells. The helmet pad includes padding material received in an enclosure between the second surface of the substrate and the outer lattice layer.

What is claimed is: 
     
         1 . A helmet pad comprising:
 a substrate having a first side attachable to an interior surface of a helmet;   an outer lattice layer peripherally attached to a second side of the substrate, the second side opposite to the first side, the outer lattice layer comprising fibers attached in one of: (i) a Voronoi lattice unit cells; and (ii) tetrahedral lattice unit cells; and   padding material received in an enclosure between the second surface of the substrate and the outer lattice layer.   
     
     
         2 . The helmet pad of  claim 1 , wherein the padding material comprises one or more internal lattice layers peripherally attached to the second side of the substrate, the one or more internal lattice layers each comprising fibers attached in one of: (i) a Voronoi lattice unit cells; and (ii) tetrahedral lattice unit cells. 
     
     
         3 . A helmet comprising:
 a helmet shell; and   one or more helmet pads, each pad comprising:
 a substrate having a first side attachable to an interior surface of a helmet, 
 an outer lattice layer peripherally attached to a second side of the substrate, the second side opposite to the first side, the outer lattice layer comprising fibers attached in one of: (i) a Voronoi lattice unit cells; and (ii) tetrahedral lattice unit cells; and 
 padding material received in an enclosure between the second surface of the substrate and the outer lattice layer. 
   
     
     
         4 . The helmet of  claim 3 , wherein the padding material comprises one or more internal lattice layers peripherally attached to the second side of the substrate, the one or more internal lattice layers each comprising fibers attached in one of: (i) a Voronoi lattice unit cells; and (ii) tetrahedral lattice unit cells.