| 摘要 |
A climbing device includes a hollow housing, a rotary drive unit, and a direction changing gear set having a main drive gear coupled to the drive unit, a transmission gear meshing with the main drive gear, first and second direction changing gears, a driven gear driven rotatably by one of the first and second direction changing gears, and a bevel gear mounted coaxially on the driven gear. A rotary wheel set is driven rotatably by the transmission gear to result in movement of the housing on a ground surface. A shift unit is disposed in the housing and has the first and second direction changing gears mounted rotatably thereon. The shift unit extends through an aperture formed in a front wall of the housing and is retractable into the housing, upon bumping into an obstruction, to move the first and second direction changing gears from a first operating state, where the first direction changing gear meshes with the main drive gear and drives rotatably the driven gear, to a second operating state, where the second direction changing gear meshes with the transmission gear and drives rotatably the driven gear. A climbing unit includes a rack which extends through aligned openings in top and bottom walls of the housing and which meshes with the bevel gear.
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