Device for electrohydraulically lifting agricultural implements
US4301870A · kind A · utility
76Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1979 |
| Grant date | Nov 24, 1981 |
| Priority date | — |
| Expiry date | Sep 10, 1999 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01B63/1117
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A device for hydraulically lifting agricultural implements by a lifting jack, utilizing a pump with constant stroke volume and a stepless distributor. A flow pressure regulator of the pump is piloted by the pressure of the lifting jack, a downstroke valve is provided for lowering the implements, and a relay valve connects to the reservoir the piloting pressure of the regulator in the downward movement of the implements. A reducing valve fed by the flow circuit of the pump feeds at least one pilot electrovalve of the stepless distributor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.