| 摘要 |
PCT No. PCT/GB83/00150 Sec. 371 Date Feb. 6, 1984 Sec. 102(e) Date Feb. 6, 1984 PCT Filed Jun. 7, 1983 PCT Pub. No. WO83/04406 PCT Pub. Date Dec. 22, 1983.Access equipment comprising an articulated boom arrangement for supporting a cage, in which a lower boom and upper boom are pivotally connected and the lower boom is pivoted to a turntable platform boom relatively to the lower boom and a second ram for moving the lower boom relatively to the platform. With a view of avoiding the need to provide complex control gear, movement of the lower boom under the control of its ram is limited so that, in its rest position, the lower boom is arranged to extend upwardly with respect to the platform at an angle theta such that, in operation, the booms are not movable into positions in which the equipment becomes unstable.
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