Seed drills
US4450779A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 20, 1982 |
| Grant date | May 29, 1984 |
| Priority date | — |
| Expiry date | Sep 20, 2002 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01C7/205
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A seed drill comprising a frame, a series of coulters mounted on the frame at positions which are spaced apart in a transverse direction relative to the direction of operative forward motion of the drill, and actuating means comprising a beam that extends in a transverse direction and is rotatable about its own longitudinal axis and about axes perpendicular to said longitudinal axis, thrust applying means connected between the frame and the beam so as to move the beam downwards, and thrust transmitting means connected between the beam and the coulters characterized in that said thrust applying means comprises two or more levers (20) pivotally mounted on the frame (1) so that they have a common pivot axis that extends in a transverse direction and is spaced from said beam, said beam (16) being rotatably supported at the ends of said levers with at least one lever located at an intermediate region in the length of the beam, and actuator means (21) being connected between the frame (1) and each lever (20). Preferably two outermost levers are each spaced inwards from the adjacent end of the beam (16). The levers (20) are pivoted at an intermediate region and the beam is supported in sp…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.