Lift tube for an agricultural implement frame
US6378621B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2000 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Aug 28, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01B73/005
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A lift and rotate agricultural implement frame comprises a main frame having a lift tube and a carrier frame slidably mounted to the lift tube. The lift tube comprises a vertically extending main support tube having planar surfaces and a corrosion resistant exterior sleeve. The corrosion resistant exterior sleeve comprises corrosion resistant plates corresponding to the planar surfaces of the main support tube. Each of the plates has an interior surface and an exterior surface. At least one of the corrosion resistant plates adjoins another plate. One of the adjoining plates is provided with an overhang that extends past the exterior surface of the other plate of the pair. The plates are fillet welded to one another between the overhang and the other plate. The plates are also provided with oblong openings having oblong edges. The oblong edges are fillet welded to the main support tube to couple the sleeve to the main support tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.