Boom extension and contraction mechanism for crane apparatus
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United States of America Patent
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Oct 24, 2017
Grant Date -
Mar 5, 2015
app pub date -
Aug 12, 2014
filing date -
Aug 30, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A boom extension and contraction mechanism for a crane apparatus includes: a flow passage switching mechanism that switches a flow passage of the hydraulic oil between the cylinder-to-boom connection switching cylinder side and the boom member connection switching cylinder side; a hose reel configured to reel out a hydraulic hose as a telescopic cylinder is extending, and to reel off the hydraulic hose as the telescopic cylinder is contracting; a cable used to supply power and transmit a signal between a swivel base and a boom; and a cord reel configured to reel out the cable as the telescopic cylinder is extending and to reel off the cable as the telescopic cylinder is contracting. The code reel and the hose reel are arranged on the base in a direction in which the boom extends and contracts.
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