| 摘要 |
A heavy duty truck carrier has a machinery platform mounted thereon for rotation in a generally horizontal plane about a substantially vertical axis. Material handling equipment, such as a crane or an excavator, is mounted upon the machinery platform in a position over the vertical axis of rotation. An operator's cab is offset from the axis of rotation and mounted upon an elevating mechanism attached to the machinery platform. The elevating mechanism has a pair of hydraulic cylinders mounted within a support frame and actuating arms extending upward from the cylinders and frame to support a bracket attached to the upper portion of the operator's cab. A pair of guide brackets project from the lower portion of the operator's cab and are slidably mounted for vertical movement about the outside surfaces of the hydraulic cylinders. Thus, the cab can be elevated to provide the operator with an unobstructed view of the work during operation or lowered for overhead clearance when the carrier is transporting the material handling equipment.
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