Three point coupling arrangement for a tractor
US4892158A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 1987 |
| Grant date | Jan 9, 1990 |
| Priority date | — |
| Expiry date | Feb 18, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01B59/043
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A three point implement hitch arrangement for a tractor including a frame assembly, a pair of draft arms pivotally supported on the frame assembly intermediate their ends and lift cylinders having a cylinder portion pivotally supported on the frame assembly above the draft arms and having a rod portion pivotally connected to the draft arms, forwardly of the draft arm pivotal connections. The lift cylinders are connected in series, wherein the area of the rod end of one cylinder is equal to the area of the head end of the second cylinder, whereby the cylinders may be operated independently to tilt the implement or operated in unison to lift the implement, eliminating the requirement for a complex structural support and control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.