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:
Apr. 28, 2026
Filed:
Mar. 08, 2021
Applicant:
Komatsu Ltd., Tokyo, JP;
Inventors:
Kiyotaka Ninomiya, Tokyo, JP;
Koji Sato, Tokyo, JP;
Takuya Higashiura, Tokyo, JP;
Yuji Fukuda, Tokyo, JP;
Akihiro Koyama, Tokyo, JP;
Assignee:
KOMATSU LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E02F 3/36 (2006.01); E02F 9/20 (2006.01); E02F 9/22 (2006.01); F15B 13/02 (2006.01);
U.S. Cl.
CPC ...
E02F 3/3663 (2013.01); E02F 3/3631 (2013.01); E02F 9/2004 (2013.01); E02F 9/2228 (2013.01); F15B 13/02 (2013.01); F15B 2211/526 (2013.01);
Abstract
A coupler cylinder is driven between a locked state and an unlocked state of a bucket by being supplied with hydraulic oil. A main pump supplies the hydraulic oil to the coupler cylinder. A pressure increasing valve controls the supply of the hydraulic oil to the coupler cylinder. A controller controls drive of the pressure increasing valve. The controller instructs the pressure increasing valve to stop the supply of the hydraulic oil to the coupler cylinder based on pressure in an oil passage between the main pump and the coupler cylinder.