Manufacturing impact absorbing structures for an athletic helmet
View Patent ↗A garment worn by a wearer has an exterior shell and an interior shell with various impact absorbing material between the exterior shell and the interior shell. The impact absorbing material includes multiple structures, such as rods or filaments, capable of deforming when force is applied then returning to its state prior to application of the force. In various embodiments, the impact absorbing material is manufactured using injection molding to allow positioning of various structures in the impact absorbing material relative to each other during manufacture. During manufacturing, one or more living hinges are included in portions of the impact absorbing material to allow certain portions of the impact absorbing material to be accurately positioned relative to each other. Other manufacturing methods may be used, such as three-dimensional printing may be used to include structures in the impact absorbing material.
1. A method for manufacturing a helmet comprising:
forming a plurality of modular rows each including an upper surface, a lower surface, and a plurality of impact absorbing members contacting the upper surface at one end and contacting the lower surface at an opposite end, comprising:
forming a core corresponding to interiors of the plurality of impact absorbing members from a material;
aligning the core between a side and an opposing side of a mold, the side contacting the opposing side at a position of the core;
injecting a material between the side and the opposing side of the mold while the core is aligned between the side and the opposing side; and
removing the core from the plurality of impact absorbing members without altering the injected material;
wherein the plurality of modular rows is formed by integrally forming columnar impact absorbing members with an upper layer of the lower surface, and integrally forming the upper surface, cores of the impact absorbing members, and a lower layer of the lower surface;
assembling the plurality of modular rows by horizontally stacking the plurality of modular rows next to a base modular row included in the plurality of modular rows; and
securing the plurality of modular rows relative to each other.
2. The method of claim 1 , wherein removing the core from the plurality of impact absorbing members without altering the injected material comprises:
heating the core to a temperature above the melting point of the material and below the melting point of the injected material.
3. The method of claim 1 , wherein removing the core from the plurality of impact absorbing members without altering the injected material comprises:
dissolving the material comprising the core in a solvent that does not affect the structural integrity of the injected material.
4. The method of claim 1 , wherein the material is selected from a group consisting of: wax, chocolate, salt, soap, glycerin, tin-bismuth alloy, polyvinyl acrylate (PVA) support material, and any combination thereof.
5. The method of claim 1 , wherein the material injected between the side and the opposing side of the mold while the core is secured between the side and the opposing side comprises a plastic.
6. The method of claim 5 , wherein the plastic comprises urethane.
7. The method of claim 1 , further comprising: injecting an additional material into interiors of the plurality of impact absorbing members.
8. The method of claim 7 , wherein the additional material comprises a foam.
9. The method of claim 1 , wherein the upper surface includes a protrusion and one end of an impact absorbing member includes a hole configured to accommodate a shape of the protrusion.
10. The method of claim 1 , wherein the upper surface includes a hole and one end of an impact absorbing member includes a protrusion having a shape configured to be inserted into the hole.
11. The method of claim 1 , wherein the upper surface includes a hole and one end of an impact absorbing member includes a protrusion having a shape configured to be inserted into the hole, the shape having a greater cross sectional area than the impact absorbing member.
12. The method of claim 1 , wherein a modular row includes a horizontally repeated spatial pattern of the plurality of impact absorbing members that do not overlap vertically and are connected by a single path.
13. The method of claim 12 , wherein the modular row includes impact absorbing member positioned in two or more vertical levels.