Patent ID: 8727335

Claim:
A gear assembly, comprising: a driving gear, adapted to rotate about an axis, and the driving gear comprising: at least one pawl, pivoted on a first surface of the driving gear; and at least one elastic member, respectively disposed in at least one slot of the driving gear, wherein one end of the elastic member is fixed in the slot and another end of the elastic member is connected to the pawl; and a driven gear, comprising a ratchet having a plurality of teeth and disposed on a second surface facing the first surface, wherein the ratchet is adapted to be engaged with the pawl, when the driving gear rotates with a driving speed along a driving direction, a centrifugal force is generated to drive the pawl to move from a nominal position to a clutching position, such that the at least one pawl is engaged with the at least one tooth of the ratchet and drives the driven gear to rotate with the driving gear, when the driving gear rotates with a nominal speed slower than the driving speed along a releasing direction opposite to the driving direction, the engagement between the pawl and the ratchet is released and the pawl is back to the nominal position so the driven gear does not rotate with the driving gear.