US 11,987,957 B2
Shovel
Junichi Okada, Kanagawa (JP); and Keiji Honda, Kanagawa (JP)
Assigned to SUMITOMO HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed by SUMITOMO HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed on Mar. 31, 2021, as Appl. No. 17/218,630.
Application 17/218,630 is a continuation of application No. PCT/JP2019/038523, filed on Sep. 30, 2019.
Claims priority of application No. 2018-188454 (JP), filed on Oct. 3, 2018.
Prior Publication US 2021/0214919 A1, Jul. 15, 2021
Int. Cl. E02F 9/22 (2006.01)
CPC E02F 9/2267 (2013.01) [B60W 2300/17 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A shovel comprising:
a machine body, the machine body including
a lower traveling structure; and
an upper swing structure swingably mounted on the lower traveling structure;
an attachment including a boom attached to the upper swing structure, an arm attached to a distal end of the boom, and an end attachment attached to a distal end of the arm;
a hydraulic cylinder configured to drive the attachment;
a controlling valve configured to discharge hydraulic oil in an oil chamber of the hydraulic cylinder to an outside; and
processing circuitry configured to automatically move the attachment by controlling the controlling valve to discharge the hydraulic oil in the oil chamber of the hydraulic cylinder to the outside, and limit a degree of movement of the attachment to or below a predetermined standard by limiting an amount of the hydraulic oil discharged from the oil chamber of the hydraulic cylinder to the outside, in response to determining that the machine body of the shovel is in a predetermined unstable state.