| 摘要 |
A boom assembly for an excavation vehicle comprises a primary boom member having one end attached to a vehicle, a secondary boom member 2 attached to a free end 7 of the primary boom for pivotal rotation of the secondary boom member about a first axis 8 relative to the primary boom member. A swivel mechanism 5 is attached to the other end of the secondary boom member 2 and is configured to enable the secondary boom member 2 to be rotated relative to the primary boom member about a second axis of rotation X independently to the pivotal rotation of the secondary boom member 2 relative to the primary boom member about the first axis of rotation 8. |
