The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 27, 2022
Filed:
Sep. 16, 2020
Applicant:
Sumitomo Heavy Industries, Ltd., Tokyo, JP;
Inventor:
Junichi Okada, Kanagawa, JP;
Assignee:
SUMITOMO HEAVY INDUSTRIES, LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E02F 9/22 (2006.01); E02F 9/26 (2006.01); F15B 11/00 (2006.01);
U.S. Cl.
CPC ...
E02F 9/2203 (2013.01); E02F 9/226 (2013.01); E02F 9/265 (2013.01); E02F 9/267 (2013.01); E02F 9/268 (2013.01); F15B 11/003 (2013.01);
Abstract
An excavator includes a hydraulic oil holding circuit that is provided in an oil passage between a bottom-side oil chamber of a boom cylinder and a control valve and is closed when the boom is not lowered, and a controller. The controller releases a closed state of the hydraulic oil holding circuit when the excavator is in a predetermined unstable state, and controls a released state so that an acting velocity in a lowering direction of the boom becomes less than or equal to a predetermined reference.