| 摘要 |
<p>The invention relates to a load-lifting and -handling appliance with an articulated slewing jib. The inventive appliance consists of: a mast with a slewing pivot, an articulated jib (16) comprising a jib foot (19) having a first end which is articulated to the top of the mast by a horizontal axis of rotation (27), a fly jib (18) which is articulated in rotation to the second end of the jib foot by means of a horizontal pivot bolt (32), a jib-retaining assembly including at least one king post (7), a jib-retaining sling (11), and a mobile counterweight (100) which is connected to the jib by means of said retaining sling. The aforementioned counterweight is slaved to follow a guide track (1) having a variable (alpha) slope, which is solidly connected to the slewing pivot, which supports the counterweight and which is disposed opposite the jib. Moreover, the (alpha) slope variations are selected such that the counterweight exerts a number of variable forces on the jib.</p> |
