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. 02, 2025
Filed:
Feb. 04, 2022
Applicant:
Komatsu Ltd., Tokyo, JP;
Inventor:
Yosuke Yamagoe, Tokyo, JP;
Assignee:
KOMATSU LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F15B 11/044 (2006.01); E02F 9/22 (2006.01);
U.S. Cl.
CPC ...
F15B 11/044 (2013.01); E02F 9/2203 (2013.01); E02F 9/2207 (2013.01); F15B 2211/3057 (2013.01); F15B 2211/3127 (2013.01);
Abstract
A boom cylinder drives a boom, and includes a head side oil chamber and a bottom side oil chamber. A first valve includes a first opening for discharging oil in the head side oil chamber to an oil tank, and supplies oil from a hydraulic pump to the head side oil chamber. A second valve includes a second opening for discharging oil in the bottom side oil chamber to the oil tank, and supplies oil from the hydraulic pump to the bottom side oil chamber. A controller individually controls an opening degree of the first opening and an opening degree of the second opening, during work including manipulation of the boom.