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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 9133604 B1

PDFFull Text
Date of Patent:
Sep. 15, 2015

Filed:

Jan. 18, 2013

Hydraulic control device for work machine

Applicant:

Hitachi Construction Machinery Co., Ltd., Bunkyo-ku, Tokyo, JP;

Inventors:

Katsuaki Kodaka, Tsuchiura, JP;

Tsuyoshi Takayama, Tsuchiura, JP;

Yukihiro Tatsuno, Tsuchiura, JP;

Assignee:

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

Attorney:

Crowell & Moring LLP

Primary Examiner:

Paul N Dickson

Assistant Examiner:

Darlene P Condra

Int. Cl.
CPC ...
E02F 3/85 (2006.01); E02F 9/20 (2006.01); B60T 13/66 (2006.01); B60T 13/68 (2006.01); E02F 9/22 (2006.01); B60T 7/08 (2006.01); B60T 17/22 (2006.01); B60T 1/06 (2006.01); B60T 7/12 (2006.01);
U.S. Cl.
CPC ...
E02F 9/2025 (2013.01); B60T 1/062 (2013.01); B60T 7/085 (2013.01); B60T 7/12 (2013.01); B60T 13/66 (2013.01); B60T 13/662 (2013.01); B60T 13/686 (2013.01); B60T 17/22 (2013.01); E02F 9/226 (2013.01); E02F 9/2253 (2013.01); E02F 9/2292 (2013.01);
Abstract

A hydraulic control device for work machine includes: a driving device that generates a driving force for traveling of the work machine; a park braking device that parks the work machine; an operating unit that is provided in a cab of the work machine and operated by an operator for driving a work device; a hydraulic brake device that generates a braking force according to operation of a brake pedal; a hydraulic lock unit that hydraulically locks the hydraulic brake device to cause the hydraulic brake device to be continuously operated; a work device drivable state judging unit that judges whether or not the work device is in a work device drivable state in which the work device can be driven; and a park brake control unit that brings the park braking device into operation when the hydraulic lock unit hydraulically locks the hydraulic brake device and the work device drivable state judging unit judges that the work device drivable state has not been established.

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