| 摘要 |
An operator's crane has a boom formed as a parallelogram mechanism which is located in a vertical plane and has longitudinal and transverse links, a support which supports a central part of the boom and placed on a base with a possibility of turning of the boom in vertical and horizontal planes, a camera and a counterweight located in a front and rear parts of the boom correspondingly, at least one further link extending parallel to the longitudinal links of the parallelogram mechanism and having a same length so as to form a second parallelogram mechanism which is located in a plane perpendicular to a plane of the first mentioned parallelogram mechanism.
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