Plastic film feeding machine, as used in agriculture
US4888913A · kind A · utility
8Cited by
1References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 10, 1988 |
| Grant date | Dec 26, 1989 |
| Priority date | — |
| Expiry date | Feb 10, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01G13/37
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A machine for laying plastic film on a substrate which comprises supporting rollers (32 to 37) on which drum (16) is placed. One of the chassis wheels (6, 8) drives the drum through a transmission system (40) including a mechanical variable speed drive (60) enabling the transmission ratio between the traction wheel and the drum drive rollers to be varied. It is thereby possible to limit the tension forces exerted on the film when laying the film, making it possible to adapt the film to an uneven substrate, such as furrows or ridges on the ground in agricultural uses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.