To provide a boom with strength to withstand practical use by avoiding stress concentration while achieving a lightweight design of the boom assuming standardization of a swivel base.SOLUTION: A boom is rotatably supported by a derricking central shaft 30 arranged along the axial direction 100, The boom comprises a base boom 54 formed in a cylindrical shape, a partition plate 60 provided at a base end in the longitudinal direction 101 of the base boom 54, and a base end frame 70 provided on the partition plate 60 and with a boss 75 through which the derricking central shaft 30 is inserted. The boss 75 has a protruding part 76 protruding outward in the width direction 100 from an outer surface 711 of a base part 71 of the base end frame 70. The boom 50 comprises an engagement plate 90 welded to a tip 761 of the protruding part 76 with the tip 761 penetrated, and a connecting plate 91 to connect the peripheral edge of the engagement plate 90 and the outer surface 711 and to accommodate the boss 75 in its inside.SELECTED DRAWING: Figure 9
【課題】旋回台の共通化を前提として、ブームの軽量化設計を達成しつつ応力集中を回避して実用に耐える強度を備えたブームを提供する。【解決手段】ブームは、幅方向100に沿って配置された起伏中心軸30に回動自在に支持されている。ブームは 筒状に形成されたベースブーム54と、ベースブーム54の長手方向101の基端に設けられた仕切板60と、仕切板60に設けられ、起伏中心軸30が挿通されるボス75を有する基端フレーム70とを備える。ボス75は、基端フレーム70の基部71の外面711から幅方向100の外側に突出した突出部76を有する。ブーム50は、突出部76の先端部761が貫通された状態で先端部761に溶接された嵌合板90と、嵌合板90の周縁及び外面711を連結し、内部にボス75を収容する連結板91とを備える。【選択図】図9
BOOM
ブーム
2021-12-23
Patent
Electronic Resource
Japanese
IPC: | B66C Krane , CRANES |
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