Heavy-duty crane with counterweight
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United States of America Patent
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-
Jul 28, 1981
Grant Date -
N/A
app pub date -
Jan 5, 1979
filing date -
Sep 12, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a heavy-duty crane particularly suitable for lifting heavy loads over tall buildings, a substructure supports a rotatable main boom. A jib for carrying the load and a secondary spar for carrying a counterweight by means of a cable are hinged to the tip of the main boom. The counterweight swivels together with turning of the loaded crane. The jib is guyed by way of the secondary spar which overhangs so far that the counterweight is disposed beyond the confines of the substructure.
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