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    • 2. 发明公开
    • Extension jib for a boom
    • Auslegerverlängerungfüreinen Hauptausleger。
    • EP0254510A1
    • 1988-01-27
    • EP87306389.5
    • 1987-07-20
    • Tadano Ltd.
    • Iga, Tadashi
    • B66C23/70
    • B66C23/702
    • A retractable extension jib for a crane boom (1) has a frame body (4) rotatably mounted on an end of the boom (1) so as to be rotatable about a rotary axis, a horizontal shaft (6) provided at a lower portion of the frame body and rotatably connected to a base portion of a jib body (2). A pair of oil hydraulic cylinders (9) are provided between a base portion of the jib body (2) and an upper portion of the frame body (4) so as to rotate the jib about the horizontal shaft (6). The hydraulic cylinders (9) are so arranged as to be able to rotate the jib from a retracted position to a lower position where a longitudinal axis of the jib is substantially parallel with the rotary axis.
    • 一种用于起重机吊臂(1)的伸缩式伸缩臂具有可旋转地安装在悬臂(1)的端部上以便能够围绕旋转轴线旋转的框体(4),设置在下部的水平轴 并且可旋转地连接到起重臂本体(2)的基部。 一对油压缸(9)设置在起重臂本体(2)的基部与框体(4)的上部之间,以便使水平轴(6)旋转。 液压缸(9)被布置成能够将副臂从缩回位置旋转到下降位置,其中起重臂的纵向轴线基本上与旋转轴线平行。