Agricultural ground working implement with hydraulic downpressure circuit
US6302220A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 28, 1999 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Oct 28, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01C7/205
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An agricultural implement includes a frame having a pair of tool-carrying wings pivotally mounted thereon for pivotal movement between raised transport positions and lowered ground-working positions. Each wing has a hydraulic wing actuator connected thereto which is extendable and retractible for effecting the pivotal motion. A hydraulic wing actuator circuit is connected to each of the wing actuators, which circuit, when connected to a tractor hydraulic system, enables the wing actuators to apply down pressure to said wings when the wings are in the lowered working positions. A hydraulic pressure control valve system controls the down pressure exerted by the wing actuators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.