Mobile harbor crane for normal and heavy load operation
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 31, 2002
Grant Date -
N/A
app pub date -
Sep 13, 2000
filing date -
Sep 13, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a mobile harbor crane for normal and heavy load operation, having an undercarriage and a superstructure mounted thereon. A tower is fastened on the superstructure and a jib which pivotable about a horizontal axis is arranged on a front side of the tower. During a normal mode of operation, the jib is held pivotably on the superstructure by a luffing cylinder coupled to the jib and to the tower and the load lifted and lowered via a hoisting cable guided to the jib head and having a snatch block suspended on it. For a heavy load operating load, the mobile harbor crane further includes a heavy load lifting winch with a heavy load lifting cable which is guided over a deflecting roller fastened to the jib and further guided to a roller assembly of a heavy load snatch block arranged releasably on the jib head. During the heavy load mode of operation, the normal load lifting mechanism of the harbor crane is used as a luffing mechanism for the jib, for which purpose the normal load hoisting cables are detached from the normal load snatch block and fixed to the jib head. In the heavy load mode of operation, the unloaded luffing cylinder is a fall-back support for the jib. The mobile harbor crane further includes an increased righting moment for the heavy load mode of operation.
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