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:
Feb. 21, 2023
Filed:
Jun. 19, 2018
Caterpillar Sarl, Geneva, CH;
Hideki Nakajima, Akashi, JP;
Caterpillar SARL, Geneva, CH;
Abstract
To be capable of dealing with a machine body lifting operation or a sudden operation, while improving energy efficiency, during a boom-lowering operation, and achieving the reduction of the number of parts, in a construction machine equipped with a boom. It is configured such that a first region Yat which a recovery valve passageis opened and a supply valve passageis closed and a second region Yat which the recovery valve passageand the supply valve passageare opened, are provided at an operating position of a first boom control valveduring the boom lowering operation, and the first boom control valveis positioned at the first region Ywhen neither a machine body lifting operation nor the sudden operation is performed during the boom-lowering operation, and at the region Ywhen the machine body lifting operation or the sudden operation is performed.