| 摘要 |
A coupling and latching mechanism for a multi-section extensible boom that includes a manual section and is operable from a remote location such as the cab of a crane. The mechanism includes pairs of spaced jaw type couplings secured to adjacent boom sections and adapted to be selectively coupled to the piston rod or the like of an extensible ram for operating the boom either with the manual section extended or retracted. Remotely controlled latch locking blocks are provided to latch the manual section in a plurality of extended positons, or in a retracted position.
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