Boom extending and retracting apparatus of a crane
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United States of America Patent
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Oct 10, 2017
Issued Date -
N/A
app pub date -
Nov 20, 2014
filing date -
Nov 26, 2013
priority date (Note) -
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Abstract
There is provided a boom extending and retracting apparatus that can improve the convenience of the telescopic boom while reducing the burden on the operator. The boom extending and retracting apparatus of the crane chooses the mode of the fluid circuit between the normal fluid circuit and the differential fluid circuit to slide a plurality of boom members by one telescopic cylinder. After the operating lever is turned to an extension side and the controller starts extending the telescopic boom using the differential fluid circuit, when the operating lever is turned to the extension side again via the neutral position, the controller chooses the normal fluid circuit to extend the telescopic boom using the normal fluid circuit.
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