Adjustment mechanism

1. An adjustment mechanism, comprising:

a generally cylindrical dial comprising an inner wall defining a hole passing through the dial, the inner wall comprising a ledge having one or more cutouts;

a base comprising a first set of teeth; an actuator comprising a second set of teeth, the second set of teeth configured to engage the first set of teeth and allow the actuator to be rotated in a first direction but not in a second opposite direction;

the actuator further comprising one or more drive-dogs, each drive-dog configured to engage a cutout on the inner wall of the dial, each drive-dog comprising a ramped edge configured to disengage the drive-dog from the cutout and to lift the second set of teeth of the actuator from the first set of teeth of the base when the dial is rotated in the second direction; and

wherein the actuator is configured to tighten an adjusted mechanism when the dial is rotated in the first direction and loosen the adjusted mechanism when the dial is rotated in the second direction.

2. The mechanism of claim 1 , wherein the adjusted mechanism is a rack, and the actuator comprises a pinion comprising a third set of teeth configured to engage the rack.

3. The mechanism of claim 1 , wherein the ledge further comprises one or more notches associated with each of the one or more cutouts, the one or more notches configured to allow the ramped edge of the drive-dog to disengage from the cutout.

4. The mechanism of claim 2 , wherein the base comprises a cover for the rack.

5. The mechanism of claim 2 , wherein the actuator is configured to tighten the rack when the dial is rotated in the first direction and loosen the rack when the dial is rotated in the second direction.

6. The mechanism of claim 2 , wherein the rack and actuator comprise a portion of a helmet fit system and are used to adjust the helmet fit system.

7. The mechanism of claim 2 , wherein the rack and actuator comprise a portion of a shoe fit system and are used to adjust the shoe fit system.

8. The mechanism of claim 1 , further comprising a spring positioned adjacent to the actuator and configured to compress the actuator against the base.

9. The mechanism of claim 2 , wherein the rack comprises a row of gear teeth, wherein the gear teeth are coupled to a plurality of arms, each of the plurality of arms attached to a helmet, and wherein the arms are configured to tighten a fit system of the helmet when the dial is rotated in the first direction.

10. The mechanism of claim 9 , wherein the arms are configured to loosen the fit system when the dial is rotated in the second direction.

11. The mechanism of claim 1 , wherein the adjusted mechanism is one or more cables, and the actuator comprises a drum configured to engage the one or more cables, wherein the one or more cables are configured to tighten a fit system when the dial is rotated in the first direction.

12. An adjustment mechanism, comprising:

a generally cylindrical dial comprising an inner wall defining a hole passing through the dial, the inner wall comprising a ledge having one or more cutouts;

a base comprising a first set of teeth;

a cylindrical shuttle comprising a second set of teeth, the second set of teeth configured to engage the first set of teeth of the base and allow an actuator coupled to the shuttle to be rotated in a first direction but not in a second opposite direction;

the shuttle further comprising one or more drive-dogs, each drive-dog configured to engage a cutout on the inner wall of the dial, each drive-dog comprising a ramped edge configured to disengage the drive-dog from the cutout and to lift the second set of teeth of the shuttle from the first set of teeth of the base when the dial is rotated in the second direction; and

wherein the actuator is configured to tighten an adjusted mechanism when the dial is rotated in the first direction and loosen the adjusted mechanism when the dial is rotated in the second direction.

13. The mechanism of claim 12 , wherein the shuttle and the actuator are configured to rotate together via a shared spline.

14. The mechanism of claim 12 , wherein the ledge further comprises one or more notches associated with each of the one or more cutouts, the one or more notches configured to allow the ramped edge of the drive-dog to disengage from the cutout.

15. The mechanism of claim 12 , wherein the adjusted mechanism is a rack, and the actuator comprises a pinion comprising a third set of teeth configured to engage the rack.

16. The mechanism of claim 15 , wherein the base comprises a cover for the rack.

17. The mechanism of claim 15 , wherein the actuator is configured to tighten the rack when the dial is rotated in the first direction and loosen the rack when the dial is rotated in the second direction.

18. The mechanism of claim 15 , wherein the rack and actuator comprise a portion of a helmet fit system and are used to adjust the helmet fit system.

19. The mechanism of claim 15 , wherein the rack and actuator comprise a portion of a shoe fit system and are used to adjust the shoe fit system.

20. The mechanism of claim 12 , further comprising a spring positioned adjacent to the shuttle and configured to compress the shuttle against the base.

21. The mechanism of claim 15 , wherein the rack comprises a row of gear teeth, wherein the gear teeth are coupled to a plurality of arms, each of the plurality of arms attached to a helmet, and wherein the arms are configured to tighten a fit system of the helmet when the dial is rotated in the first direction.

22. The mechanism of claim 12 , wherein the adjusted mechanism is one or more cables, and the actuator comprises a drum configured to engage the one or more cables, wherein the one or more cables are configured to tighten a fit system when the dial is rotated in the first direction.