Patent ID: 7634820

Claim:
An adjustment mechanism for a helmet, the mechanism comprising: a first sliding surface defined in a first portion of the helmet, the first sliding surface including an opening defined through the first portion; a second sliding surface defined in a second portion of the helmet, the second sliding surface having two spaced apart arms extending therefrom, the first and second sliding surfaces being in sliding engagement with one another with the arms protruding through the opening and slidable therewithin; and a lever pivotally connected to the first portion in proximity to the opening and pivotable between a locked position and an unlocked position, the lever having a series of regularly spaced apart parallel teeth which in the locked position protrude through the opening with at least a selected one of the teeth being engageable between the two spaced apart arms to prevent the first and second sliding surfaces from sliding relative to one another, the lever in the unlocked position being pivoted away from the opening such that the teeth are disengaged from the arms; wherein the spaced apart arms are accessible through the opening.