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. 17, 2022
Filed:
Sep. 29, 2017
Hitachi Construction Machinery Tierra Co., Ltd., Koka, JP;
Yoshifumi Takebayashi, Koka, JP;
Hajime Yoshida, Omihachiman, JP;
Natsuki Nakamura, Koka, JP;
Daisuke Oka, Yasu, JP;
Abstract
Provided is a construction machine that can prevent a machine body from being lowered since a blade is not put into a float state even where a misoperation is made by an operator when the machine body is in a jacked-up state, and that can perform a favorable leveling operation by putting the blade into the float state in accordance with an operator's operation when the machine body is not in the jacked-up state. A hydraulic excavator includes a controllerthat determines whether or not the machine body is in a jacked-up state and controls a float valve. In the case where it is determined that the machine body is not in the jacked-up state, the controllerchanges over the float valveto a float position V and invalidates an operation of a blade control valve, in accordance with a float instruction. In the case where it is determined that the machine body is in the jacked-up state, the controllerholds the float valvein a reference position IV and validates the operation of the blade control valve, irrespectively of the presence or absence of the float instruction.