Tramlining device for seed drill
US4289256A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 1979 |
| Grant date | Sep 15, 1981 |
| Priority date | — |
| Expiry date | Oct 1, 1999 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01C7/087
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A tramlining device is provided for a seed drill having shutters associated with respective seed spouts and controlled by individual fluid pressure operated actuators for improved flexibility in selecting the tramline spacing. The actuators are preferably such that when pressurized they close the shutters to produce tramlines. Fluid pressure is tapped from the rams that force the coulters into work. Preferably, a control valve in the fluid supply line comprises a valve member that is urged closed by the supply pressure but is opened by a plunger controlled by a bout register. Preferably, a solenoid operated plunger is provided to override operation of the bout register.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.