| 摘要 |
A variable geometry mounting arrangement for the boom assembly of a backhoe is disclosed which permits relatively great working depths without increasing the overall height of the backhoe assembly in its raised, transport position. The arrangement includes a bellcrank coupler assembly operatively interposed between a swing tower and boom assembly of a backhoe, with a gearing arrangement provided operatively connecting the boom and the swing tower. By this construction, the vertical disposition of the horizontal pivot axis of the boom is altered as the boom is pivoted. The bellcrank coupler asembly provides a central anchor for the hydraulic fluid boom actuator of the backhoe, and permits the actuator to work through a relatively large moment arm for enhanced performance, and further permits use of a relatively simpified box-section boom construction.
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