| 摘要 |
<p>An industrial crane has a chassis with a housing mounted on the chassis having a flat, horizontal deck with a central well providing access to a bearing for a rotatable upper works, the bearing being centered on the chassis. The upper works has a portion extending into the well to the bearing. The chassis is supported by four wheels, two of which are on an oscillating axle. The wheels are one size, and extend above the chassis which is between them. The upper works includes a cab, directly over the bearing, a boom support rearwardly of the cab, an engine rearwardly of the boom support, and a lifting boom journalled to the boom support rearwardly of the cab and extending forwardly over the cab. The boom is lifted by a lift cylinder rearwardly of the cab. The boom and the cab, as well as the engine, have their lateral centers in line, along the median plane of the upper works. and the upper works median plane coincides with the chassis median plane when the upper works is forward or rearward.</p> |
