Telescopic boom for cranes
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United States of America Patent
Stats
-
Feb 11, 2003
Grant Date -
N/A
app pub date -
Oct 6, 2000
filing date -
Oct 6, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A telescopic boom for crane, in particular mobile cranes, includes a base section and a plurality of boom sections received in the base section and telescopically extendible and retractable. The base section and the boom sections are each made of a profile comprised of an upper shell and a lower shell which are joined together at their confronting walls, with the upper shell having a nominal wall thickness which is equal or smaller than a nominal wall thickness of the lower shell. At least one portion of the upper and lower shells includes, as viewed in cross section, two outer thin metal sheets which are placed in spaced-apart relationship to define an intermediate space therebetween.
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