| 摘要 |
PURPOSE:To enable to easily run on a nonflat ground, by a construction wherein each front wheel consists of a set of three wheels provided around a driving shaft, and each rear wheel consists of a large-diameter wheel, in a running gear which enables to run on a nonflat ground such as a stairway. CONSTITUTION:Central gears 9 are fixed to the driving gear 8 borne at a front part of a body 7, and three external gears 10a-10c are provided around each of the gears 9. The gears 10a-10c are rotatably supported through shafts 13a-13c between tips of arm parts extended in three directions from a pair of rotary bearings 16 rotatably supported by the driving gear 8, and wheels 11a-11c brought into contact with the ground are fixed to the shafts 13a-13c. On the other hand, the rear wheels 12 having a relatively large diameter are provided at a rear part of the body 7. When the wheels 11a come into contact with a nonflat ground (projected part), the condition is detected, the wheels 11a are locked, and the wheels 11b, llc are revolved while being rotated until the wheels 11b come into contact with the projected part, thereby enabling to ride onto the projected part. |
