| 摘要 |
For use in energized high voltage pole line maintenance work, a vertical mast carrying a temporary crossarm is adjustably attached to an adapter sleeve mounted in lieu of one of the buckets of a dual-bucket truck on the self-leveling cross shaft, so that the axis of the sleeve is always vertically disposed. The mast is slidingly received and movable lengthwise within the adapter sleeve. The lineman in the bucket first maneuvers the boom carrying the bucket and the temporary crossarm to a desired position usually adjacent to the pole, under the high voltage line conductor(s). He then, by power means, raises the mast carrying the temporary crossarm, thereby lifting the conductor(s) above the pole top. In so lifting the mast, each of the line conductors drops into a receiving bracket on the temporary crossarm and is automatically locked therein. A quick disconnect for releasing the crossarm from the mast is provided controlled by a lineman on the ground. In a modified form, the mast-carrying sleeve may be mounted on the end of a jib arm extending forwardly from the boom of a bucket truck.
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