PROBLEM TO BE SOLVED: To provide an undulating member in that a boom and a jib can be fell down on the ground while avoiding regulation of rotation of a jib due to a jib back stop when an undulating member is disassembled.SOLUTION: A undulating member 1 includes a boom 8, a jib 10, and a jib back stop 12. The jib 10 includes a jib body 14 and a back stop receiving portion 16 and the jib back stop 12 includes a back stop body 20 and a swing member 50. The swing member 50 allows an engaging part 20m of the back stop body 20 to be engaged with an engaged part 16b of the back stop receiving portion 16 when performing a raising operation of the undulating member 1. Further, the swing member 50 is abutted to the jib body 14 and moves the engaging part 20m in front of the engaged part 16b when performing the fall-down operation of the undulating member 1. As a result, the boom 8 and the jib 10 can be fell down on the ground.SELECTED DRAWING: Figure 10
【課題】起伏部材の分解時にジブバックストップによるジブの回動の規制を回避してブームとジブを地面に倒伏できるようにする。【解決手段】起伏部材1は、ブーム8と、ジブ10と、ジブバックストップ12とを備える。ジブ10は、ジブ本体14と、バックストップ受部16と、を備え、ジブバックストップ12は、バックストップ本体20と、揺動部材50と、を備える。揺動部材50は、起伏部材1の起立動作時に、バックストップ本体20の係合部20mがバックストップ受部16の被係合部16bに係合することを許容する。また、揺動部材50は、起伏部材1の倒伏動作時に、ジブ本体14に当接し、係合部20mを被係合部16bよりも前方に移動させる。この結果、ブーム8およびジブ10が地上に倒伏可能とされる。【選択図】図10
UNDULATING MEMBER
起伏部材
2018-04-05
Patent
Electronic Resource
Japanese
IPC: | B66C Krane , CRANES |
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