Patent ID: 8870208

Claim:
A side-step device comprising: a driving unit mounted on a vehicle body; a pinion gear connected to the driving unit and configured to rotate; a driving gear unit composed of an outer gear surrounding a portion of the pinion gear and engaging with the pinion gear and a rack gear extending from one end of the outer gear to the vehicle body; and a step connected to an opposite side of the vehicle body and to the driving gear unit, wherein the step is folded in a normal state, and unfolded out from the vehicle body upon interlocking the pinion gear and the outer gear, and extending out from the vehicle body from the unfolded state upon interlocking the pinion gear and the rack gear, wherein a series of teeth of the outer gear and the rack gear of the driving gear unit are continuously fitted such that the series of teeth maintains a travel path for the pinion gear along the driving gear unit.