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:
May. 21, 2013
Filed:
Feb. 28, 2008
Hidetoshi Satake, Ishioka, JP;
Katsuaki Kodaka, Abiko, JP;
Yuuki Gotou, Tsuchiura, JP;
Yuuji Nagashima, Tsuchiura, JP;
Kazuhiro Ichimura, Kasumigaura, JP;
Hidetoshi Satake, Ishioka, JP;
Katsuaki Kodaka, Abiko, JP;
Yuuki Gotou, Tsuchiura, JP;
Yuuji Nagashima, Tsuchiura, JP;
Kazuhiro Ichimura, Kasumigaura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
There are provided: control valves-that control flow of pressure oil from the hydraulic sourceto the hydraulic actuators-; electric lever devices-that output electrical operation signals, which are drive instructions for the hydraulic actuators-, in correspondence to lever operation; and a control unit-andthat controls the control valves-in correspondence to the operation signals. When the determination unit determines that an operation signal is not within the normal range, the hydraulic actuators-are allowed to be driven with flow of pressure oil to the hydraulic actuators-limited more significantly than in a case where it is decided that an operation signal is within the normal range.