PROBLEM TO BE SOLVED: To provide a compact wheel device capable of climbing over a step easily and smoothly.SOLUTION: A wheel device includes: a freely rotatable travelling wheel 9 a first swing arm 10 in which a step detection roller 1 arranged in front of the travelling wheel 9 is attached to a first lower end part 10b a second swing arm 20 in which an auxiliary wheel 2 arranged in front of the step detection roller 1 is attached to a second lower end part 20b and a repulsive energization member 3 for always energizing the second lower end part 20b forward-upwardly repulsively. The step detection roller 1 is brought into contact with a step end surface Db and the first swing arm 10 swings backward and causes the second swing arm 20 to swing downward against the repulsive energization member 3 so that the auxiliary wheel 2 is pressed against a step top face Da.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2017,JPO&INPIT【課題】容易かつスムーズに段差に乗り上げることが可能で、しかも、コンパクトな車輪装置を提供する。【解決手段】回転自在な走行車輪9と、走行車輪9の前方位置に配設される段差検知ローラ1が第1下端部10bに取着された第1揺動アーム10と、段差検知ローラ1の前方位置に配設される補助車輪2が第2下端部20bに取着された第2揺動アーム20と、第2下端部20bを前上方へ常時弾発付勢するための弾発付勢部材3と、を備え、段差端面Dbに段差検知ローラ1が接触することで、第1揺動アーム10が後方へ揺動して第2揺動アーム20を弾発付勢部材3に抗して下方へ揺動させ、補助車輪2を段差上面Daに押し付けるように構成した。【選択図】図4
