| 摘要 |
A rock working implement carrier comprising a boom adapted to be pivotally mounted by one end on a mobile machine, power means to move the boom relative to the machine and hold it in a selected position, a head pivotally mounted on the other end of the boom, a socket on the head, a mast vertically slidable and rotatable in the socket, power means to move the head and the mast and hold the several parts in selected positions, a yoke mounted on the bottom of the mast, an implement carrier swingably mounted in the yoke and means to move and hold the carrier in a selected position, an implement cradle slidably mounted in and projecting from the carrier and a pneumatic-cylinder plunger unit to actuate the cradle. |
