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Patent Searching and Data


Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2020/067366
Kind Code:
A1
Abstract:
A work machine is provided with which it is possible to more quickly stop an unexpected operation of an actuator due to an incorrect operation when switching the gate lock lever. When a lock operation device is operated from a permitted position to a forbidden position, the work machine determines, on the basis of the detection result of a pressure sensor, whether pilot pressure oil has been output from a pilot valve during the interval, after a lock valve is switched from a lock position to a release position, until a first time period has elapsed since the lock valve was switched to the release position, and when it is determined that pilot pressure oil has been output during the interval before the first time period has elapsed, the lock valve is held in the lock position, and when it is determined that pilot pressure oil has not been output during the period before the first time has elapsed, and a second time period has elapsed, the lock valve is switched from the lock position to the release position.

Inventors:
KODAKA KATSUAKI (JP)
FUKUCHI RYOHEI (JP)
MIZOGUCHI KAZUHIKO (JP)
HAGIWARA NAOKI (JP)
Application Number:
PCT/JP2019/038009
Publication Date:
April 02, 2020
Filing Date:
September 26, 2019
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
E02F9/20; E02F9/24
Domestic Patent References:
WO2013179517A12013-12-05
WO2015011832A12015-01-29
WO2018155567A12018-08-30
Foreign References:
JPH051436A1993-01-08
JP5467176B12014-04-09
Other References:
See also references of EP 3751059A4
Attorney, Agent or Firm:
THE PATENT BODY CORPORATE TAKEWA INTERNATIONAL PATENT OFFICE (JP)
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