Head gear fitting system

1. An adjustment apparatus for a helmet, the helmet having a belt disposed inside the helmet, the belt having a first end portion and a second end portion that are coupled such that the belt forms a loop, the adjustment apparatus comprising:

a base having a first end and a second end, the base defining a first aperture at a first side and a second aperture at a second side of the base between the first and the second ends;

a channel defined in the base and extending from the first end to the second end, the channel configured to receive the first and the second end portions of the belt at the first end and the second end, respectively;

an adjuster positioned at least partly in the channel and configured to engage both the first and the second end portions of the belt, the adjuster operable to adjust the size of the loop by urging the first and second end portions along the channel in opposite directions, the adjuster at least partly protruding from the second aperture of the base;

a pawl positioned in the base proximate to the adjuster, the pawl operable to engage the adjuster to prevent a movement of the adjuster in at least one direction;

a release actuator coupled to the pawl via the first aperture of the base, the release actuator operable to disengage the pawl from the adjuster; and

a hoop spring coupled to the pawl and operable to urge the pawl against the adjuster so that the pawl is engaged with the adjuster.

2. The apparatus of claim 1 , wherein the base is coupled to the belt so that the second aperture faces away from the helmet.

3. The apparatus of claim 1 , wherein:

the adjuster comprises:

a wheel protruding at least partly out of the first aperture, the wheel having a first side and a second side, the first side defining a cylindrical cavity and a plurality of teeth positioned around the circumference of the cylindrical cavity; and

a pinion gear coupled to the second side of the wheel, the pinion gear comprising a plurality of gear teeth formed around a circumference of the pinion gear;

wherein the adjuster is configured to engage both the first and the second end portions of the belt using the plurality of gear teeth of the pinion gear.

4. The apparatus of claim 1 , wherein the first end and the second end are separated from each other by a distance of between approximately 130 and 140 millimeters.

5. The apparatus of claim 1 , wherein

a row of gear teeth having a first side and a second side opposite from the first side, the first side not directly attached to any supporting structure, wherein the gear teeth form a curvature towards a top portion of the helmet having a radius of curvature of approximately 14-18 inches; and

a flange positioned along the second side of the row of gear teeth to structurally support the gear teeth.

6. The apparatus of claim 5 , wherein the belt, the row of gear teeth, and the flange are formed from a same material.

7. The apparatus of claim 6 , wherein the same material is low density polyethylene.

8. The apparatus of claim 5 , wherein the radius of curvature ef is approximately 16 inches.

9. The apparatus of claim 5 , and further comprising an L-shaped flange coupling each end portion and the row of gear teeth.

10. The apparatus of claim 1 ,

wherein the first and the second end portions the belt, when at least partly overlapped, define a curvature towards a top portion of the helmet having a radius of curvature of approximately 14 to 18 inches.

11. The apparatus of claim 10 , wherein the radius is approximately 16 inches.

12. The apparatus of claim 10 , wherein the first and the second end portions comprise a first row of teeth and a second row of teeth, respectively, and the curvature is defined by the first and the second rows of teeth.

13. The apparatus of claim 12 , wherein each of the first and the second end portions comprises:

a row of gear teeth having a first side and a second side opposite from the first side, the first side not directly attached to any supporting structure; and

a flange positioned along the second side of the row of gear teeth to structurally support the gear teeth.

14. The apparatus of claim 1 , wherein

the first end of the base slidably engages the a first strap secured to an anchor attached to a rear portion of the helmet and the second end slidably engages a second strap secured to the anchor such that the base is able to slide with respect to the length of the first and second straps.

15. The apparatus of claim 14 , wherein the first and the second ends are flexible.

16. The apparatus of claim 14 , wherein the base is indirectly coupled to the helmet by only the belt, the first strap, and the second strap.

17. The apparatus of claim 14 , wherein the base comprises a face that approximates a curvature of an occiput of a user.

18. The apparatus of claim 1 , wherein the channel defines a curvature towards a top portion of the helmet having a radius of curvature of approximately 14-18 inches.

19. The apparatus of claim 1 , wherein the channel defines a curvature towards a top portion of the helmet having a radius of curvature of approximately 16 inches.

20. The apparatus of claim 1 , wherein the adjuster and the release actuator are respectively positioned on opposite sides of the base and between the first and the second ends of the base.

21. The apparatus of claim 1 , wherein the base comprises a face that approximates a contour of an occiput of a user.

22. The apparatus of claim 1 , wherein the first end and the second end of the base each comprises a flexible loop operable to receive a strap having a length and to allow the length of the strap to slide with respect to the base.

23. A system for fitting a helmet on a head of a user, the helmet having a first strap and a second strap anchored at a rear portion of the helmet, the system comprising:

a belt disposed at least partly in an interior of the helmet, the belt having a first curved rack gear and a second curved rack gear that extend toward the rear portion of the helmet, each of the first and the second curved rack gears having a side that is attached to a curved flange and a radius of curvature of approximately 16 inches, the belt defining a first hole and a second hole;

a rib positioned across the first hole;

a button suspended over the second hole by a pair of collapsible legs coupling the button and the belt, the button having a footprint that fits within the second hole;

a belt adjustment mechanism not directly attached to the helmet, the belt adjustment mechanism comprising:

a pinion gear engaged with the first and the second curved rack gears of the belt;

a wheel gear coaxially attached to the pinion gear;

a ratchet engaged with the wheel gear;

a release actuator coupled to the ratchet and positioned in a location separate from the wheel gear;

a first end slidably coupled to the first strap; and

a second end positioned approximately 135 millimeters from the first end and slidably coupled to the second strap;

wherein the wheel gear is operable to incrementally urge the first and the second curved rack gears in opposite directions using the pinion gear by turning in a first direction, the ratchet is operable to prevent the wheel gear from turning in a second direction that is opposite from the first direction, and the release actuator is operable to disengage the ratchet from the wheel; and

a pad defining a button hole, an compressed arcuated strip and a compressed strip having an approximately same orientation and width as the rib, the pad coupled to the button of the belt at the button hole and woven through the first hole and the rib, wherein the compressed strip of the pad underlies the rib, and the compressed arcuated strip is disposed approximately along the length of the pad.