Boom control system for a construction machine
US11585068B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 19, 2018 |
| Grant date | Feb 21, 2023 |
| Priority date | — |
| Expiry date | Oct 11, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/7128
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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 Y1 at which a recovery valve passage 16e is opened and a supply valve passage 16f is closed and a second region Y2 at which the recovery valve passage 16e and the supply valve passage 16f are opened, are provided at an operating position of a first boom control valve 16 during the boom lowering operation, and the first boom control valve 16 is positioned at the first region Y1 when neither a machine body lifting operation nor the sudden operation is performed during the boom-lowering operation, and at the region Y2 when the machine body lifting operation or the sudden operation is performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.