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:
Aug. 19, 2025
Filed:
Mar. 10, 2023
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Taro Akita, Tsuchiura, JP;
Shota Ishida, Tsukuba, JP;
Mitsuhiko Kanehama, Kasumigaura, JP;
Ryohei Fukuchi, Tsukuba, JP;
HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;
Abstract
Provided is a work machine capable of appropriately switching between prevention of the degradation in a ride quality caused by an inertial force generated in braking of a hydraulic actuator and a work using the inertial force. In the work machine, under a condition where an operation device has been operated from an operation position toward a neutral position, in a case where an actual operation speed of the operation device is less than a quick operation threshold (S: Yes), a spool is made moved from a supply and discharge position toward a blocking position at a first speed that is slower than a reference speed corresponding to the operation speed (S, Sto S), and at a second speed that is faster than the first speed (Sto S) in a case where the operation speed is equal to or more than the quick operation threshold (S: No).