EXPANSION DEVICE AND CRANE

Title:

EXPANSION DEVICE AND CRANE

Document Type and Number:

WIPO Patent Application WO/2020/183686

Kind Code:

A1

Abstract:

This expansion device is a expansion device that expands and contracts an expandable boom having a first boom element and a second boom element which expandably overlap, the expansion device comprising: a first hydraulic source that discharges a first working fluid; an expandable cylinder that has a fixed part and a movable part movable with respect to the fixed part, is operated on the basis of supply of the first working fluid, and moves, relative to the second boom element, the first boom element in a stretching direction; a second hydraulic source that is provided to the movable part, discharges the second working fluid, and is a separate hydraulic source from the first hydraulic source; a first connecting mechanism that is provided to the movable part, is operated on the basis of supply of the second working fluid, and switches between a connected state and a disconnected state of the first boom element and the movable part; and a second connecting mechanism that is provided to the movable part, is operated on the basis of supplying the second working fluid, and switches between a connected state and a disconnected state of the first boom element and the second boom element.

Inventors:

KAWABUCHI NAOTO (JP)
KITAYAMA HIROSHI (DE)
MASUDA NAOTAKA (DE)
WADA HISANORI (JP)
KAWANO TAKASHI (JP)

Application Number:

PCT/JP2019/010473

Publication Date:

September 17, 2020

Filing Date:

March 14, 2019

Export Citation:

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Assignee:

TADANO LTD (JP)

International Classes:

B66C23/693

Foreign References:

JP2017154875A	2017-09-07
US4298128A	1981-11-03
JP2012166920A	2012-09-06
JP2012096928A	2012-05-24
JP2011207598A	2011-10-20
JP2002332194A	2002-11-22

Other References: