Height control system with multiple control valves
US4809487A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1987 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Sep 28, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01D46/08
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Height sensing structure utilizing a pair of height sensing valves connected to height sensing shoes on two row harvesting units. The row harvesting units are transversely adjustable on support structure to accommodate different row spacings and to open up space between the units for service and inspection. The height control valves are connected by flexible conduit and a shuttle check valve to a lift cylinder, and interconnecting linkages between the height sensing shoes on adjacent units are eliminated so that the units may be freely adjusted. The shuttle valve assures that the height control valve sensing the highest ground condition controls the lift cylinder to prevent "digging in".
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.