Hydraulic excavator

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 9284714
APP PUB NO 20150240446A1
SERIAL NO

14370069

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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There is provided a hydraulic excavator in which invasion of a design surface by a work implement can be suppressed. A boom-lowering proportional solenoid valve is provided in a boom-lowering pilot conduit connected to a boom-lowering pilot port. A first pressure sensor detects a pressure generated in the boom-lowering pilot conduit between a control lever and the boom-lowering proportional solenoid valve. A controller controls an opening degree of the boom-lowering proportional solenoid valve based on the pressure detected by the first pressure sensor. The controller gently increases, from zero, a current value outputted to the boom-lowering proportional solenoid valve.

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First Claim

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Patent Owner(s)

Patent OwnerAddress
KOMATSU LTD1-2-20 KAIGAN MINATO-KU TOKYO 1058316 ?1058316

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Takaura, Takeshi Minoh, JP 19 319

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