PROBLEM TO BE SOLVED: To provide a nesting prevention device in which the nesting of birds such as crows is prevented in utility poles or steel towers for power transmission lines, and the crows are prevented from flying to the place again.SOLUTION: A nesting prevention device has: an exterior part 4 forming a hollow vessel shape in the inside and having multiple openings 41 in one side a cloud-shaped body 5 stored in the cavity of the exterior part 4, forming a random irregular shape on the surface of a cylinder, and rotatably supported snake models 6 each using a configuration of a snake as a motif a windmill mechanism 9 disposed outside the exterior part 4 and rotated by receiving wind and rotation transmission mechanisms 94, 7, 81 for transmitting the rotation by the windmill mechanism 9 to the cloud-shaped body 5. The snake models 6 each have a head 64 directed toward the top and the tip of a tail being brought into abutment with the cloud-shaped body 5 substantially upward, and are mounted in the position being the same as the opening 41 of the exterior part 4. The cloud-shaped body 5 rotates by the rotation of the windmill mechanism 9, and the snake model 6 moves up and down following the irregularities on the surface of the cloud-shaped body 5, and thereby the head 64 of the snake model 6 is exposed or retracted from the opening 41 of the exterior part 4.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】 電柱や送電線用の鉄塔などにおいて、カラスなど鳥類の営巣を防止するとともに、カラスなどが二度とこの場所には飛来して来ないようにする。【解決手段】 中が空洞の容器状を成し、一面に複数の開口41を有する外装部4と、外装部4の空洞内に収納され、円筒の表面にランダムな凹凸形状を形成してなり、回転自在に支持された雲状体5と、蛇の形態をモチーフした蛇模型6と、外装部4の外側に配置され、風を受けて回転する風車機構9と、前記風車機構9による回転を前記雲状体5に伝えるための回転伝達機構94、7、81と、を有し、蛇模型6は、頭部64を上に向け、尾の先端を前記雲状体5に当接した略上向きで、前記外装部4の開口41と同じ位置に載置され、風車機構9の回転により雲状体5が回転し、該雲状体5の表面の凹凸に倣って蛇模型6が上下動をして外装部4の前記開口41から蛇模型6の頭部64が露出したり引っ込んだりする。【選択図】 図2
