Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2022/190725
Kind Code:
A1
Abstract:
This work machine comprises a second pilot line that guides the hydraulic pressure from a pilot hydraulic pressure source to a pilot valve by bypassing a first gate lock valve, a second gate lock valve provided on the second pilot line and switched between an open position at which the supply of hydraulic fluid to the pilot valve is allowed and a closed position at which the supply of hydraulic fluid is cut off, and a control device that controls the second gate lock valve on the basis of a second remote operation signal transmitted from a remote operation device and controls the pilot valve according to a first remote operation signal transmitted from the remote operation device. While the first gate lock valve is at a closed position, the second gate lock valve can be controlled by the control device when stairs are in a retracted state, and is kept at the closed position regardless of the second remote operation signal when the stairs are in an expanded state.
Inventors:
SAITOH TEPPEI (JP)
FUJITA KOUJI (JP)
ITOU HIDEAKI (JP)
ISHIMOTO HIDEFUMI (JP)
NARIKAWA RYU (JP)
NISHIZAWA TADASHI (JP)
FUJITA KOUJI (JP)
ITOU HIDEAKI (JP)
ISHIMOTO HIDEFUMI (JP)
NARIKAWA RYU (JP)
NISHIZAWA TADASHI (JP)
Application Number:
PCT/JP2022/004180
Publication Date:
September 15, 2022
Filing Date:
February 03, 2022
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
E02F9/16; E02F9/20; E02F9/24
Domestic Patent References:
| WO2016174977A1 | 2016-11-03 | |||
| WO2016174977A1 | 2016-11-03 |
Foreign References:
| JP2020105879A | 2020-07-09 | |||
| JP2016069963A | 2016-05-09 | |||
| JP2020041352A | 2020-03-19 | |||
| JP2017186875A | 2017-10-12 | |||
| JP2009114631A | 2009-05-28 |
Attorney, Agent or Firm:
KAICHI IP (JP)
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