PROBLEM TO BE SOLVED: To provide a low cost boom type implement which can simply and safely change the vertical attaching and fixing position of a boom device to a parallel linkage type lift device.SOLUTION: This boom type implement has: guide supports 25, 25 which are lifted or lowered with a parallel linkage type lift device 15 boom supports 26, 26 which are connected to the guide supports 25, 25, can relatively be lifted or lowered along the guide supports 25, 25, while held in the connected state, and can be fixed to the guide supports 25, 25 at a plurality of vertical positions and a boom device 6 fixed to the boom supports 26, 26. A method for changing the vertical position of a boom device comprises supporting the boom device 6 on a support 33, releasing the fixed state of the boom supports 26, 26 to the guide supports 25, 25, operating the lift device 15 to lift the guide supports 25, 25, fixing the boom supports 26, 26 to new positions of the guide supports 25, 25, and then removing the support 33.COPYRIGHT: (C)2008,JPO&INPIT【課題】 平行リンケージ式リフト装置に対するブーム装置の上下取付固定位置を簡単且つ安全に変更できる、安価なブーム式作業機を提供する。【解決手段】 平行リンケージ式リフト装置15によって昇降駆動されるガイド支柱25,25と、該ガイド支柱25,25に結合され、その結合状態を保持したままで該ガイド支柱25,25に沿って相対的に上下動自在であり、且つ、該ガイド支柱25,25に対して複数の上下位置で固定可能なブーム支持体26,26と、該ブーム支持体26,26に固着されたブーム装置6を備える。該ブーム装置6を支柱33で支持させ、前記ガイド支柱25,25と前記ブーム支持体26,26の固定状態を解除し、前記リフト装置15を作動させて前記ガイド支柱25,25を昇降させ、前記ガイド支柱25,25の新たな位置に前記ブーム支持体26,26を固定する。その後、前記支柱33を取り外す。【選択図】 図1
