Folding implement frame for grain drills and the like
US4664202A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1984 |
| Grant date | May 12, 1987 |
| Priority date | — |
| Expiry date | Sep 7, 2004 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01C15/005
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A pull-type folding implement, such as a grain drill, has individual and independent radial flotation for each of its drill units such that each unit can rise and fall, while remaining level, independently of the other, as well as cock and cant independently of the other as may be necessary to accommodate uneven ground terrain, yet the units may be folded into compact, fore-and-aft extending transport positions in which ground wheels thereof are retracted off the ground and the units are carried by a main, fore-and-aft carrier frame of the implement. A third, center unit may be provided between the two outer units and utilizes its own set of ground wheels during both field working and over-the-road travel when the other units are folded in, the center unit likewise having a floating connection with the carrier frame which permits the center unit to rise and fall, cock and cant when experiencing terrain irregularities. Because the weight of the two outer units is borne entirely by the carrier frame when the outer units are folded in for transport, a safety interlock is provided which prevents unfolding of the outer units from the carrier frame unless the ground wheels of the outer u…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.