Telescopic boom extension device
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United States of America Patent
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Aug 22, 2017
Issued Date -
Aug 4, 2016
app pub date -
Jan 29, 2016
filing date -
Feb 4, 2015
priority date (Note) -
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Abstract
A telescopic boom extension device includes a cylinder-boom coupling mechanism, an inter-boom fixing mechanism, and a driving mechanism that drives the foregoing two. The driving mechanism has a hydraulic supply part and a drive source generation part. The hydraulic supply part includes an AOH and is provided at a cylinder tube of a telescopic boom. The hydraulic supply part supplies operating oil selectively to actuators driving a B pin and a C pin. The drive source generation part includes an air hose and supplies compressed air to the AOH. The air hose is wound around a hose reel in an unrollable manner.
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