Wing fold implement and folding sequence control therefor
US4320805A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 23, 1980 |
| Grant date | Mar 23, 1982 |
| Priority date | — |
| Expiry date | Jul 23, 2000 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01B73/044
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A hydraulic control for a folding tool bar which has a transport width less than half the field working width. Restrictors are added in series in the right-hand folding lines to cause the left-hand outrigger to fold to the transport position first. A one-way plunger operated ball check valve located in the hinge area between the main frame and an outrigger frame bypasses the restrictors for the first five degrees of fold and for the complete unfold cycle. The outriggers can therefore be lifted together at the start of the fold cycle during turns in the headlands. For complete folding to the transport position the left-hand outrigger folds first with the end of the right-hand outrigger positioned above it. The ball check valve causes the right-hand outrigger to unfold out of the path of the left-hand outrigger during the unfolding cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.