PROBLEM TO BE SOLVED: To provide a telescopic device of a telescopic boom in which operability of the telescopic boom can be improved while reducing a cost, an insertion work can be efficiently performed, and a cross sectional area of the entire telescopic boom can be limited to a minimum required area.SOLUTION: A telescopic device 3 of a telescopic boom 1 comprises: a telescopic cylinder 4 which extends/contracts a second boom 22; and a telescopic mechanism 5 which simultaneously extends/contracts a top boom 24 and a third boom 23 while being interlocked with a telescopic motion of the telescopic cylinder 4. The telescopic mechanism 5 comprises: a rod-like support member 10 arranged in parallel with the telescopic cylinder 4; a sheave 71(71) for extending the top boom which is arranged on a tip side of the rod-like support member 10; and a sheave 61 for extending the third boom which is arranged on a tip side of the telescopic cylinder 4. The rod-like support member 10 is formed such that a part of the sheave 61 for extending the third boom is arranged inside the member.SELECTED DRAWING: Figure 1
【課題】低コスト化を図りつつ伸縮ブームの操作性を改善でき、差し込み作業の効率化を図ることができ、伸縮ブーム全体の断面積を必要最小限に抑えることができる伸縮ブームの伸縮装置を提供する。【解決手段】伸縮ブーム1の伸縮装置3は、セカンドブーム22を伸縮する伸縮シリンダ4と、伸縮シリンダ4の伸縮動作に連動してトップブーム24とサードブーム23を同時に伸縮する伸縮機構5とを備えている。伸縮機構5は、伸縮シリンダ4と平行に配置される棒状サポート部材10と、棒状サポート部材10の先端側に配置されたトップブーム伸長用シーブ71(71)と、伸縮シリンダ4の先端側に配置されたサードブーム伸長用シーブ61とを備えている。棒状サポート部材10は、その内側にサードブーム伸長用シーブ61の一部が配置されるように形成されている。【選択図】図1
TELESCOPIC DEVICE OF TELESCOPIC BOOM
伸縮ブームの伸縮装置
2016-05-16
Patent
Electronic Resource
Japanese
IPC: | B66C Krane , CRANES |