Draft load measurement and control
US4807136A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1987 |
| Grant date | Feb 21, 1989 |
| Priority date | — |
| Expiry date | Oct 26, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01B63/112
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A tractor coupled to a draft implement through at least one link arm of a hydraulic lift assembly having a lift rod coupled between each link arm and a hydraulic cylinder for raising and lowering the draft implement. A force sensor is coupled to a link arm for providing a measurement of the total force exerted on the link arm. Electrical circuitry provides a measurement of the actual draft force by correcting the total force measurement for lift forces transmitted to the link arm through the corresponding lift rod. A feedback or draft control system is also provided for adjusting the depth of the draft implement in inverse relation to the corrected measurement of actual draft force.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.