Furrow opener assembly with integral down-pressure adjustment
US4700785A · kind A · utility
26Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1986 |
| Grant date | Oct 20, 1987 |
| Priority date | — |
| Expiry date | Mar 24, 2006 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01B35/24
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A shank assembly including a rearwardly opening bracket pivotally mounting a shank. A tension link extends upwardly from a central portion of the shank and through an apertured strap. A stop member at the upper end of the link limits the downward rocking of the shank. An adjustable arm assembly including a trunnion slidably received over the tension link is pivotally connected to the bracket and adjustably compresses a down-pressure spring which encircles the link between the trunnion and the shank. Individual down-pressure adjustments can be made without affecting the transport height of the assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.