Concentric ring segment supported lift crane
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United States of America Patent
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-
Feb 23, 1982
Grant Date -
N/A
app pub date -
Mar 7, 1980
filing date -
Mar 7, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Front and rear pairs of crawler assemblies are provided for supporting concentric ring segments disposed forwardly under the boom and rearwardly under the counterweight so the crane can travel under load and swing through at least a partial horizontal arc. One and preferably both crawler assemblies are selectively and reversely powered to facilitate forward and reverse as well as turning movement during travel under loaded and unloaded conditions.
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