Metal detection in the vicinity of ferrous boundaries
US4788813A · kind A · utility
6Cited by
8References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1988 |
| Grant date | Dec 6, 1988 |
| Priority date | — |
| Expiry date | Jan 13, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01D75/187
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In a forage harvester having a metal detector with permanent magnets located within a crop feed roll, additional permanent magnets are positioned beyond the ends of the feed roll and at a distance greater than the radius of the feed roll from the axis of rotation of the feed roll. The additional magnets cooperate with magnets within the feed roll to provide a more uniform flux density across the width of the feed roll, even in regions near ferrous side sheets defining the lateral limits of the harvester feed path. Tramp metal is thus detected with equal facility regardless of its trajectory past the feed roll.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.