US 12,286,768 B2
Work machine
Hiroaki Tanaka, Kasumigaura (JP); Yusuke Suzuki, Tsukuba (JP); Akihiro Narazaki, Tsukuba (JP); Yasuhiko Kanari, Kasumigaura (JP); and Hiroshi Sakamoto, Kashiwa (JP)
Assigned to HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo (JP)
Appl. No. 18/022,787
Filed by HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo (JP)
PCT Filed Nov. 9, 2021, PCT No. PCT/JP2021/041241
§ 371(c)(1), (2) Date Feb. 23, 2023,
PCT Pub. No. WO2022/208972, PCT Pub. Date Oct. 6, 2022.
Claims priority of application No. 2021-058509 (JP), filed on Mar. 30, 2021.
Prior Publication US 2023/0304260 A1, Sep. 28, 2023
Int. Cl. E02F 9/20 (2006.01); E02F 3/32 (2006.01); E02F 3/43 (2006.01); E02F 9/02 (2006.01); E02F 9/12 (2006.01); E02F 9/22 (2006.01); E02F 9/24 (2006.01)
CPC E02F 9/2033 (2013.01) [E02F 3/32 (2013.01); E02F 3/435 (2013.01); E02F 9/123 (2013.01); E02F 9/2271 (2013.01); E02F 9/24 (2013.01); E02F 9/02 (2013.01); E02F 9/2228 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A work machine comprising:
a machine main body;
an articulated work device that includes a work instrument and is attached to the machine main body;
an operation device that provides instructions on actions of the machine main body and the work device; and
a controller that performs work range limiting control to decelerate or stop an action of the machine main body or the work device according to a distance between a monitor point set on the work device and an entry prohibited area such that the monitor point does not enter the entry prohibited area;
the controller starting the work range limiting control when the distance between the monitor point and the entry prohibited area decreases to a first distance, and ending the work range limiting control when the distance between the monitor point and the entry prohibited area increases to a second distance greater than the first distance,
wherein the controller is configured to change the second distance according to an operation amount of the operation device.