Grain drill furrow opening assembly
US4214537A · kind A · utility
10Cited by
11References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1978 |
| Grant date | Jul 29, 1980 |
| Priority date | — |
| Expiry date | Mar 16, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S111/927
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A seed drill has a frame, a transverse hopper and a series of triple disc coulters mounted on the frame below the hopper. The coulters are each mounted on the frame by a parallelogram linkage which maintains the proper relative positions of the front and rear discs of the coulters at different penetration depths and permits the maximum transport height of the coulters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.