Tractor hitch
US4216975A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1978 |
| Grant date | Aug 12, 1980 |
| Priority date | — |
| Expiry date | Dec 11, 1998 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01B59/062
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A tractor hitch having a rockshaft pivotally carried between a pair of tractor frames behind and below the rear axle which carries a bellcrank to which a pair of draft links and drawbar are pivotally attached. A pair of lift arms are attached to the rockshaft, one on either side of the bellcrank, and are connected by connecting links to the draft links to support and lift the draft links and drawbar upon actuation of a pair of lift cylinders connected to the midpoints of the lift arms. A coupler frame with a three-point hitch is carried by the rear end of the draft links and is held in an upright position by three links connected to the upper portion of the tractor frames to define a four-bar linkage to allow translation of the coupler frame relative to the rear axle. A bellcrank actuator is actuable to rotate the bellcrank to move the draft links either forward or back to tilt the coupler frame and move the drawbar forward and back. Sway links are connected to the bellcrank and to the draft links to provide sway control for the draft links and drawbar.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.