PROBLEM TO BE SOLVED: To improve an extending device of an extendable boom to be mounted on a mobile crane, achieve smooth driving of, so called, a B pin and a C pin provided in the extendable boom even under a low temperature environment, and decrease the extending device in weight and size.SOLUTION: An extending device comprises a cylinder/boom connection mechanism 15, an inter-boom fixing mechanism 16 and a driving mechanism 17 that drives the mechanisms. The driving mechanism 17 has a hydraulic pressure supply portion 18 and a driving source generating portion 19. The hydraulic pressure supply portion 18 comprises an AOH 51 and is provided in a cylinder tube of an extendable boom 13. The hydraulic pressure supply portion 18 supplies selectively hydraulic oil to actuators 31 and 35 which drive a B pin 26 and a C pin 34. The driving source generating portion 19 comprises an air hose 57 and supplies compressed air to the AOH51. The air hose 57 is wound up retractably onto a hose reel 58.SELECTED DRAWING: Figure 6

    【課題】移動式クレーンに搭載される伸縮ブームの伸縮装置の改良。低温環境下においても、伸縮ブームに設けられているいわゆるBピン及びCピンの円滑な駆動の実現。当該伸縮装置の軽量小型化。【解決手段】この伸縮装置は、シリンダ・ブーム連結機構15、ブーム間固定機構16及びこれらを駆動する駆動機構17を備える。駆動機構17は、油圧供給部18及び駆動源発生部19を有する。油圧供給部18は、AOH51を備え、伸縮ブーム13のシリンダチューブに設けられている。油圧供給部18は、Bピン26及びCピン34を駆動するアクチュエータ31、35に選択的に作動油を供給する。駆動源発生部19は、エアホース57を備え、圧縮空気をAOH51に供給する。エアホース57はホースリール58に引き出し自在に巻き取られている。【選択図】図6


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    Title :

    EXTENDING DEVICE OF EXTENDABLE BOOM


    Additional title:

    伸縮ブームの伸縮装置


    Contributors:

    Publication date :

    2016-08-08


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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