Depth control system for raising and lowering a work unit of an implement
US10798866B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 2018 |
| Grant date | Oct 13, 2020 |
| Priority date | — |
| Expiry date | Sep 29, 2038 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01C7/205
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present inventors have recognized that hydraulic cylinders for raising and lowering “work units” of an agricultural implement used for engaging the ground can be improved by replacing one or more electronically controlled (electrohydraulic) proportional valves associated with a rod port of the cylinder with a simplified, flow control device, such as a pressure regulator, while still using the electronically controlled proportional valves associated with a base port of the cylinder. Due to the weight of the implement being associated with the rod side, which tends to force retraction of the rod when not opposed by the base side, complex proportional valves associated with the rod side can be replaced with such simplified devices providing a relatively low pressure sufficient to move hydraulic fluid with respect to the rod side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.