| 摘要 |
A helmet adjustment mechanism is adapted to adjust the size of a helmet having first and second retention members (e.g., plastic straps) movable with respect to each other. The adjustment mechanism includes an actuating member (e.g., a pinion) coupled to at least one of the retention members and movable (e.g., rotatable) in two directions to move at least one of the retention members relative to the other. A clutch mechanism is coupled to the actuating member and includes at least one locking member (e.g., two locking members) that inhibits movement of the actuating member in both of the two directions. The adjustment mechanism also includes a release mechanism (e.g., including a rotary dial) adapted to move the locking member from a locked position to an unlocked position to allow movement of the actuating member. When the actuating member is being moved, the adjustment mechanism also provides a ratcheting detent.
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