Draft and position control linkage with depth limit for a tractor
US4108248A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 17, 1976 |
| Grant date | Aug 22, 1978 |
| Priority date | — |
| Expiry date | Dec 17, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01B63/1117
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An improved draft and position control system for a tractor. Independent manually operable draft and position controls are provided for establishing a desired draft and/or position of an implement drawn by a tractor. The position control establishes the maximum lowered position to which the implement may descend and will override any draft signals which would tend to lower the implement beyond this point. The draft control includes the draft responsive member interconnected with a feedback mechanism which will tend to maintain the desired draft on the implement. An additional position feedback is provided which can moderate the draft feedback to prevent undue response of the implement during changes of the draft load. In accordance with the principles of this invention the position feedback which moderates the draft feedback can be infinitely varied between a first setting wherein it fails to moderate to a second setting where it substantially moderates. Furthermore, the moderating position feedback is inoperative over a range of movement corresponding to that movement of the implement above the ground.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.