PROBLEM TO BE SOLVED: To provide a columnar body elevating machine the posture of which is more suitably maintained and thus the smooth movement of which is secured even when the columnar body to be elevated is variable in diameter.SOLUTION: A columnar body elevating machine is structured as follows: each of wheel support devices 5 has a pair of right and left support arms 16 (16L, 16R) to independently support two wheels 7 (7L, 7R), so as to make each of the wheels 7 (7L, 7R) abut on the outer circumferential surface 10a of a tree trunk 10 at positions separating from each other in a circumferential direction and each of the wheel support devices 5 makes respective support arms 16 (16L, 16R) synchronously operated symmetrically so that the traces of the respective wheels 7 (7L, 7R) abutting on the outer circumferential surface 10a intersect with each other at the axis center P0 of the tree trunk 10.COPYRIGHT: (C)2013,JPO&INPIT【課題】直径が変化する柱体を対象とする場合においても、より好適に機体の姿勢を維持して円滑な動作を担保することができる柱体昇降機を提供すること。【解決手段】各車輪支持装置5は、左右一対の支持アーム16(16L,16R)を有して二つの車輪7(7L,7R)を独立に支持することにより当該各車輪7(7L,7R)を周方向に離間した位置において樹幹10の外周面10aに当接させる。そして、各車輪支持装置5は、その外周面10aに当接する各車輪7(7L,7R)の軌跡が樹幹10の軸中心P0で交差するように各支持アーム16(16L,16R)を左右対称に同期して動作させる。【選択図】図5
