US 12,000,115 B2
Hydraulic excavator
Saito Katayama, Tsuchiura (JP); Kazuhiko Mizoguchi, Ishioka (JP); Hidenobu Tsukada, Ushiku (JP); Keiichirou Nakamura, Mito (JP); Shinichi Sasazaki, Tsuchiura (JP); and Naoki Hagiwara, Kasumigaua (JP)
Assigned to HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo (JP)
Appl. No. 17/276,585
Filed by HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo (JP)
PCT Filed Oct. 10, 2019, PCT No. PCT/JP2019/040110
§ 371(c)(1), (2) Date Mar. 16, 2021,
PCT Pub. No. WO2020/080264, PCT Pub. Date Apr. 23, 2020.
Claims priority of application No. 2018-194653 (JP), filed on Oct. 15, 2018.
Prior Publication US 2022/0042285 A1, Feb. 10, 2022
Int. Cl. E02F 9/26 (2006.01); E02F 9/12 (2006.01); E02F 9/20 (2006.01); E02F 9/22 (2006.01)
CPC E02F 9/261 (2013.01) [E02F 9/123 (2013.01); E02F 9/2004 (2013.01); E02F 9/2285 (2013.01); E02F 9/2296 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A hydraulic excavator comprising:
a lower track structure;
an upper swing structure swingably attached to an upper portion of the lower track structure;
a front work device attached to the upper swing structure;
an operation device that operates operation targets including the lower track structure, the upper swing structure, and the front work device;
a lock lever switched to one of a lock position that disables an operation of the operation targets by the operation device and a lock release position that permits the operation of the operation targets by the operation device;
a camera that is attached to the upper swing structure and records a video of surroundings of the upper swing structure, the video including time series data of still images recorded by the camera;
a controller configured to detect a presence or absence of an obstacle around the upper swing structure based on a luminance change in each pixel of each still image recorded by the camera; and
a notifying device that makes a notification that the obstacle is detected when the controller detects the obstacle, wherein
the controller is configured to permit the notification by the notifying device when the lock lever is at the lock release position and when the operation device is maintained in a non-operating state from a time of a start of the controller and, when the lock lever is at the lock release position and when the operation device is changed from an operating state to a non-operating state, permit the notification by the notifying device upon the non-operating state being continued for a predetermined time.