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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.:

US 12031298 B1

PDFFull Text
Date of Patent:
Jul. 09, 2024

Filed:

Jan. 22, 2020

Work machine

Applicant:

Hitachi Construction Machinery Co., Ltd., Tokyo, JP;

Inventor:

Takatoshi Ooki, Kasumigaura, JP;

Assignee:

HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;

Attorney:

MATTINGLY & MALUR, PC

Primary Examiner:

Minnah L Seoh

Assistant Examiner:

Christopher B Wehrly

Int. Cl.
CPC ...
E02F 9/22 (2006.01); B62D 5/09 (2006.01); B62D 5/28 (2006.01); B62D 5/30 (2006.01); E02F 9/24 (2006.01); E02F 9/26 (2006.01); F15B 20/00 (2006.01);
U.S. Cl.
CPC ...
E02F 9/225 (2013.01); B62D 5/091 (2013.01); B62D 5/28 (2013.01); B62D 5/30 (2013.01); E02F 9/24 (2013.01); F15B 20/00 (2013.01); E02F 9/26 (2013.01);
Abstract

The present invention provides a work machine including a steering device that is very responsive to switching operations. The work machine includes: a proportional solenoid valve for outputting a first pilot pressure oil with a pressure responding to a steering signal; a solenoid valve for outputting a second pilot pressure oil with a predetermined pressure while the steering signal is outputted from the steering device; a switching valve capable of switching to a first state of outputting the first pilot pressure oil to a directional control valve and a second state of outputting the second pilot pressure oil to the directional control valve, while the first pilot pressure oil is outputted from the proportional solenoid valve and the second pilot pressure oil is outputted from the solenoid valve in parallel; and a controller to switch the switching valve from the first state to the second state in a case where a malfunction is detected in a main circuit ranging from the steering device to the directional control valve via the proportional solenoid valve and the switching valve of the first state.

Find Patent Forward Citations

Ooki, Takatoshi. (2024). Work machine (U.S. Patent No. 12031298). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/12031298

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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