To improve rigidity of an extension mast.SOLUTION: A diagonal rod, which is included in an extension mast including a foldable truss stage, comprises a tip side bar and a rear end side bar which are so connected to each other as to be movable in a longer direction, the tip side bar (the rear end side bar) includes a tip side (a rear end side) fitting which so guides the rear end side bar (the tip side bar) as to be movable in the longer direction, and both fittings contact each other and regulate movement in the longer direction in the state that the extension mast is extended. At least one of both fittings has a fitting part which extends to one end side, and at least the other of both fittings has a fitted part which fits to the fitting part in the state that the extension mast is extended. The fitting part and the fitted part contact each other in the state that the extension mast is extended, and generate a drag including a component in an off-set direction, which connects a center of the tip side bar and a center of the rear end side bar, in a flat surface perpendicular to the longer direction.SELECTED DRAWING: Figure 6
【課題】伸展マストの剛性を高めることを目的とする。【解決手段】折り畳み可能なトラスのステージを含む伸展マストに含まれるダイアゴナルロッドが、互いに長手方向に移動可能に連結される先端側棒及び後端側棒からなり、先端側棒(後端側棒)は、後端側棒(先端側棒)を長手方向に移動可能となるように案内する先端側(後端側)フィッティングを含み、両フィッティングは、伸展マストが伸展した状態で、互いに接触して、長手方向の移動を規制し、両フィッティングの少なくとも一方は、一方の端側に延出する嵌合部を有し、両フィッティングの少なくとも他方は、伸展マストが伸展した状態で、嵌合部と嵌合する被嵌合部を有し、嵌合部及び被嵌合部は、伸展マストが伸展した状態で、互いに接触して、長手方向に垂直な平面において先端側棒部分の中心と後端側棒の中心を結ぶオフセット方向の成分を含む抗力を発生させる。【選択図】図6
EXTENSION MAST
伸展マスト
2019-05-23
Patent
Electronic Resource
Japanese
European Patent Office | 2016
|