Sports helmet with custom-fit liner
A sports helmet has composite helmet liner to improve and customize the fit of the helmet to the wearer. The composite liner consists of a base liner and a selected group of fit elements, for example, fit pods, removably attached to the inner surface of the base liner (i.e., the surface of the base liner facing the wearer's head). The fit pods are selected from a set of fit pods having different properties, for example, different sizes, thicknesses, densities, and cross-sections. The selection of fit pods from the set may be aided by taking anatomical measurements of the wearer's head and analyzing the measurements with respect to the geometry of the helmet to produce a pressure map. The measurements may be taken by physical contact or by non-contact means. The fit pods may be selected to optimize a pressure map, and thus optimize the fit, for a given wearer of the helmet.
1. A sports helmet comprising:
a shell;
a helmet liner disposed within the shell, the helmet liner comprising:
a base liner comprising a top sheet of polymer material having a plurality of base cells formed therein and a bottom sheet of polymer material sealed to the top sheet to seal the base cells, each base cell enclosing a base pad of foam material;
a plurality of fit pods removably attached to a surface of the base liner, each fit pod comprising a top sheet of polymer material having a fit cell formed therein, a bottom sheet sealed to the top sheet to seal the fit cell, the fit cell enclosing a fit pad of foam material having a thickness and a density and a cross-section;
wherein each of the plurality of fit pods is selected from a set of various fit pods of different types to customize the helmet to fit the head of the wearer;
wherein a plurality of pre-determined attachment sites is defined on the base layer, the attachment sites tessellating all or part of the bottom sheet of the base liner; and
wherein the fit pods are interchangeable such that each fit pod is attachable at any of the attachment sites.
2. The helmet of claim 1 wherein the set comprises:
at least one fit pod of first type including a first fit pad having a first thickness and a first density;
at least one fit pod of second type including a second fit pad having the first thickness and a second density;
at least one fit pod of third type including a third fit pad having a second thickness and the first density;
at least one fit pod of fourth type including a fourth fit pad having the second thickness and the second density;
at least one fit pod of fifth type including a fifth fit pad having a third thickness and the first density;
at least one fit pod of sixth type including a sixth fit pad having the third thickness and the second density;
provided that the first thickness, second thickness, and third thickness are not equal and provided that the first density and second density are not equal.
3. The helmet of claim 1 wherein all of the fit pods in the set have the same cross-section.
4. The helmet of claim 1 wherein each type of fit pod in the set is distinguished from the other types of fit pod in the set by having a different combination of thickness and density and cross section.
5. The helmet of claim 1 wherein the base liner comprises at least one inflatable cell, the at least one inflatable cell connected by a tube for fluid communication with a remote valve unit for inflating the inflatable cell, the remote valve unit including a needle valve having an valve hole for admission of a needle of a needle pump, the remote valve unit residing within an opening in the shell such that the valve hole is accessible from outside the shell, the shell having an outer surface and an inner surface, the remote valve unit having an outer flange disposed on the outer surface and an inner flange disposed on the inner surface for retaining the remote valve unit in a position on the shell.
6. The helmet of claim 5 wherein the opening in the shell comprises a first opening section having a first diameter large enough for passage of the first flange through the first opening section and a second opening section having a second diameter that is less than the first diameter and small enough to prevent passage of the first flange through the second opening section, the remote valve unit residing within the second opening section.