Title:
CRANE
Document Type and Number:
WIPO Patent Application WO/2017/195716
Kind Code:
A1
Abstract:
Provided is a crane 1 constituting a hydraulic system H that includes: actuators 25, 35, 45; direction switching valves 20, 30, 40 that switch the flow direction of an operating fluid for actuating the actuators 25, 35, 45; and proportional depressurization valves 26, 36, 46 that enable the adjustment of the pressure of an operating fluid for actuating the direction switching valves 20, 30, 40, wherein flow passages 51, 52 are provided for guiding the operating fluid to one or a plurality of the proportional depressurization valves 26, 36, 46, and an emergency proportional depressurization valve 50, the opening degree of which can be adjusted with a manual operation is disposed in the flow passages 51, 52. The emergency proportional depressurization valve 50 is controlled so as to maintain a fully-open state during normal times and serves as a manually operable tool for adjusting the pressure of the operating fluid without being controlled during an emergency.
Inventors:
KAWABUCHI NAOTO (JP)
MASUDA NAOTAKA (JP)
YOSHIDA NAOFUMI (JP)
MASUDA NAOTAKA (JP)
YOSHIDA NAOFUMI (JP)
Application Number:
PCT/JP2017/017341
Publication Date:
November 16, 2017
Filing Date:
May 08, 2017
Export Citation:
Assignee:
TADANO LTD (JP)
International Classes:
B66C13/20; B66C23/693; B66C23/82; B66C23/86; F15B11/08; F15B20/00
Foreign References:
| JP3037677B1 | 2000-04-24 | |||
| JP2972530B2 | 1999-11-08 | |||
| JPH0214811U | 1990-01-30 | |||
| JPS6268004U | 1987-04-28 | |||
| CN103740878A | 2014-04-23 |
Attorney, Agent or Firm:
YANO INTERNATIONAL PATENT ATTORNEYS OFFICE, P.C. (JP)
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