Title:
EXPANSION/CONTRACTION MECHANISM
Document Type and Number:
WIPO Patent Application WO/2017/150706
Kind Code:
A1
Abstract:
An expansion/contraction mechanism according to the present invention includes: an expansion/contraction cylinder; a boom fixing means; a cylinder-and-boom connecting means; and a hydraulic-pressure supply part, and expands or contracts a plurality of booms, except for a base boom, one step by one step, by expanding or contracting the expansion/contraction cylinder. The hydraulic-pressure supply part includes a pneumatic pressure source, a switching valve that switches the destination of the air delivered from the pneumatic pressure source, a first pneumatic-pressure path through which first air delivered from the switching valve flows, a second pneumatic-pressure path through which second air delivered from the switching valve flows, a first pneumatic-hydraulic converting part that converts the pneumatic pressure produced by the first air to the hydraulic pressure and supplies the hydraulic pressure to a first hydraulic pressure cylinder, and a second pneumatic-hydraulic converting part that converts the pneumatic pressure produced by the second air to the hydraulic pressure and supplies the hydraulic pressure to a second hydraulic pressure cylinder. The pneumatic pressure source and the switching valve are disposed on a fixed-part side of the expansion/contraction cylinder, and the first pneumatic-hydraulic converting part and the second pneumatic-hydraulic converting part are disposed on a movable-part side of the expansion/contraction cylinder.
Inventors:
KAWABUCHI NAOTO
KAWANO TAKASHI
KAWANO TAKASHI
Application Number:
PCT/JP2017/008490
Publication Date:
September 08, 2017
Filing Date:
March 03, 2017
Export Citation:
Assignee:
TADANO LTD (JP)
International Classes:
B66C23/693
Foreign References:
| JP2016155654A | 2016-09-01 | |||
| JP2016141542A | 2016-08-08 | |||
| JP2010184754A | 2010-08-26 | |||
| JP2003192276A | 2003-07-09 | |||
| JP2009298597A | 2009-12-24 | |||
| JPH11310391A | 1999-11-09 | |||
| JP4709431B2 | 2011-06-22 |
Other References:
See also references of EP 3424868A4
Attorney, Agent or Firm:
WASHIDA, Kimihito (JP)
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