| 摘要 |
A means and technique are disclosed whereby a crane boom or other outrigger device which is mounted on an anchorage to be pivoted into an operatively inclined position relative to the horizontal, may be comprised of a pair of elongated boom sections that are relatively reciprocably engaged to be extended and retracted in relation to one another along the length of the device while it is in the operatively inclined position thereof. According to the invention, the means for raising and lowering the device to and from the operatively inclined position thereof, and supporting it in said position, include a pair of pendants that are operatively interconnected between the anchorage and the aforesaid boom sections, and each individually operative to assume support of the device when in tension. In addition, there are control means connected to one of the pendants which are operative to shift the support of the device from the one pendant to the other, and vice versa, by altering the tension in the aforesaid one pendant so as to pivot the device either toward or away from the horizontal when the other pendant is taut.
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