PROBLEM TO BE SOLVED: To provide a nesting prevention device for a cross arm, the device that can be installed in conformity to different inner diameter of the cross arm and a projection of an inner circumferential surface, and can reduce a risk of detachment.SOLUTION: A nesting prevention device for a cross arm includes: a body part 20 inserted to face an inner circumferential surface 132 of a cross arm 130 from an opening 131 of an end of the cross arm 130 projections 31, 32 provided to project from a facing surface 21A of the body part 20 facing the inner circumferential surface 132 toward the inner circumferential surface 132, and coming in contact with the inner circumferential surface 132 so that the body part 20 may not escape from the opening 131 a lid part 40 provided in the body part 20 and closing the opening 131 while the body part 20 is inserted into the inside of the cross arm 130 and a grip part 50 provided to project from the lid part 40 and gripped with an indirect hot-line tool.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】異なる腕金の内径や内周面の突起物に合わせて設置できるとともに脱落のリスクを軽減できる腕金用営巣防止具を提供する。【解決手段】腕金130の端部の開口131から前記腕金130の内周面132と対向するように挿入される胴体部20と、前記内周面132と対向する前記胴体部20の対向面21Aから前記内周面132に向かって突出するように設けられ、前記胴体部20が前記開口131から抜け出さないように前記内周面132に接触する突出部31、32と、前記胴体部20に設けられ、前記胴体部20が前記腕金130の内部に挿入された状態で前記開口131を塞ぐ蓋部40と、前記蓋部40から突出するように設けられ、間接活線工具で把持される把持部50と、を備える。【選択図】図2
