PROBLEM TO BE SOLVED: To prevent a tube of a boom extension cylinder from swinging in a vertical direction due to vibration during traveling when driving a crane vehicle.SOLUTION: A projection piece receiving section 22 provided inside a tip section of a tip side boom component 5 is made to approach a projection piece 21 provided at an end section on a counter piston rod projection side of a tube 9 in a boom extension cylinder 6 in a downsizing stroke of a boom 1. Entering of the projection piece 21 into the projection piece receiving section 22 is guided using tapered surfaces of a guide section 34 provided in the projection piece 21 and a guide section 36 provided in the projection piece receiving section 22. A state that the end section on the counter piston rod projection side of the tube 9 is slightly lifted up against gravity by a slide contact action between the tapered surfaces is held. A state that the tube 9 of the boom extension cylinder 6 and the peripheral parts are separated together from a bottom face and a top face of the tip side boom component 5 is maintained.SELECTED DRAWING: Figure 4

    【課題】クレーン車を運転する際にブーム伸縮シリンダのチューブが走行時の振動によって上下方向に振れることを防止する。【解決手段】ブーム伸縮シリンダ6におけるチューブ9の反ピストンロッド突出側の端部に設けられた突出片21に先端側ブーム構成要素5の先端部内側に設けられた突出片受け部22をブーム1の縮小行程で接近させ、突出片21に設けたガイド部34と突出片受け部22に設けたガイド部36のテーパ面を利用して突出片受け部22への突出片21の侵入をガイドし、テーパ面の摺接作用によってチューブ9の反ピストンロッド突出側の端部を重力に抗して僅かに上に持ち上げた状態を保持し、ブーム伸縮シリンダ6のチューブ9および其の周辺パーツを先端側ブーム構成要素5の底面および天面から共に離間させた状態を維持する。【選択図】図4


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    Titel :

    BOOM BREAKAGE PREVENTION DEVICE OF CRANE VEHICLE


    Weitere Titelangaben:

    クレーン車のブーム破損防止装置


    Beteiligte:

    Erscheinungsdatum :

    30.05.2016


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    IPC:    B66C Krane , CRANES



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