Helmets comprising additively-manufactured components
A helmet comprising one or more additively-manufactured components designed to enhance performance and use of the helmet, such as: impact protection, including for managing different types of impacts; fit and comfort; adjustability; and/or other aspects of the helmet. Methods of additively-manufacturing components for such helmets are also provided, including methods involving expandable materials and the expansion of post-additively manufactured expandable components.
1. A helmet comprising:
an outer shell; and
an impact absorbing inner liner, the impact absorbing inner liner comprising:
a first padding component disposed within the outer shell, the first padding component being configured to compress when the helmet is impacted; and
a plurality of second padding components disposed within the outer shell at selected locations around a wearer's head when the helmet is worn, the first padding component and the second padding components each defining a separate padding forming parts of the impact absorbing inner liner,
each second padding component of the plurality of second padding components comprising:
an inner head facing surface, an outer shell facing surface and outer peripheral surfaces extending between the head facing surface and the outer shell facing surface, at least one of the outer peripheral surfaces comprising an open surface that provides multiple openings therethrough; and
an array of shock absorbers extending between the head facing surface and the outer shell facing surface of the second padding component and configured to deform when the helmet is impacted,
wherein:
each the second padding component has a plurality of channels extending therethrough in a direction that is generally radial to a wearer's head when the helmet is worn;
each channel in a specific one of the second padding components comprises an inner peripheral surface extending between a first respective opening in the head facing surface of the specific one of the second padding components to a second respective opening in the shell facing surface of the specific one of the second padding components;
the inner peripheral surface of each the channel comprises an open surface that provides multiple openings therethrough; and
each the channel has a cross-sectional area that is greater than a cross-sectional area of any one of the openings through the open surface of the inner peripheral surface of the channel.
2. The helmet of claim 1 , wherein, at least one of the second padding components is configured such that the cross-sectional area of each of the channels extending through the second padding component is greater than a cross-sectional area of any one of the openings through the open surface of one or more of the outer peripheral surfaces of the second padding component.
3. The helmet of claim 1 , wherein at least one of the second padding components is configured such that each shock absorber of the second padding component is an elongate member, the array of shock absorbers of the second padding component being arranged such that an elongated dimension of each shock absorber extends generally radially with respect to the wearer's head when the helmet is worn.
4. The helmet of claim 3 , wherein each shock absorber of the at least one of the second padding components is configured to attenuate a radial impact on the helmet by buckling along the shock absorber's elongated dimension.
5. The helmet of claim 1 , wherein the shock absorbers have a non-lattice structure.
6. The helmet of claim 1 , wherein the plurality of second padding components comprises at least one second padding component disposed within the outer shell in a front region of the helmet and at least one second padding component disposed within the outer shell in a rear region of the helmet.
7. The helmet of claim 1 , wherein the first padding component has a non-lattice structure.
8. The helmet of claim 1 , wherein the first padding component comprises a three-dimensional (3D) lattice structure formed of a plurality of unit cells and a liner skin integrally formed with the 3D lattice structure, the liner skin defining part of a head facing surface of the first padding component, the liner skin adapted to contact a wearer's head when the helmet is worn, the liner skin comprising:
at least one solid skin along the head facing surface of the first padding component; and
at least one open lattice skin along the head facing surface of the first padding component to define at least one exposed region of the 3D lattice structure free of the solid skin.
9. The helmet of claim 8 , wherein a majority of a surface area of the head facing surface of the first padding component is occupied by the at least one open-lattice skin.
10. The helmet of claim 8 , wherein each open-lattice skin of the first padding component occupies a surface area of the head facing surface of the first padding component that exposes multiple unit cells of the three-dimensional lattice structure.
11. The helmet of claim 1 , wherein the outer shell comprises a first shell member and a second shell member movable relative to one another to adjust the helmet to fit a wearer's head when the helmet is worn.
12. The helmet of claim 11 , wherein the first padding component comprises a first liner portion disposed within the first shell member and a second liner portion disposed within the second shell member, wherein the first liner portion and the second liner portion each define a separate padding forming parts of the impact absorbing inner liner.
13. The helmet of claim 12 , wherein the first shell member is a front shell member and the second shell member is a rear shell member, the first shell member and the second shell member being slidably engaged such that movement of the front shell member and the rear shell member relative to each other adjusts at least a longitudinal size of a head-receiving cavity defined by the outer shell.
14. The helmet of claim 13 , further comprising an adjustment system operable to adjust the fit of the helmet on a wearer's head by moving the first and second shell members relative to one another.