PROBLEM TO BE SOLVED: To provide a pole body raising/lowering work device stably performing raising/lowering because wheels set on both ends of a swinging member strongly press and contact simultaneously the external peripheral surface of a pole body when the cross section shape of a tree trunk changes.SOLUTION: This raising/lowering work device 20 is such that lower main wheels 72A are attached to both ends of a swinging member 31 so as to make both ends of the swinging member 31 movable closely and separately from the external peripheral surface of a tree trunk, and support swingably to a circular machine casing 21 in the middle part of the swinging member 31. When the diameter of a pole body (tree trunk) changes in raising/lowering, both ends of the swinging member 31 are closable and separatable from the external peripheral surface of the pole body, and the swinging member 31 is attached to the circular machine casing, so each of the lower main wheels 72A set on both ends of the swinging member 31 strongly presses and contacts simultaneously the external peripheral surface of the pole body, and consequently, raising/lowering is stably performed.COPYRIGHT: (C)2011,JPO&INPIT【課題】樹幹が断面形状が変化した際に、揺動部材の両端に設けられた車輪が同時に柱体の外周面に強く押し付けて接触でき、このため、安定して昇降ができる柱体昇降作業装置を提供する。【解決手段】昇降作業装置20は、揺動部材31が樹幹の外周面へその両端が接近離間移動可能に、揺動部材31の中間部にて環状機枠21に対し揺動自在に支持するようし、該揺動部材31の両端に下部主車輪72Aが取付けられている。昇降時において柱体(樹幹)の径に変化があった場合、揺動部材31の両端が柱体の外周面にそれぞれ接近離間可能に、揺動部材31が環状機枠に対して取付けされているため、揺動部材31の両端に設けられた各下部主車輪72Aが同時に柱体の外周面に強く押し付けて接触でき、このため、安定して昇降ができる。【選択図】図1
