Control system for front end loader boom and bucket operating systems
US4779416A · kind A · utility
12Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1987 |
| Grant date | Oct 25, 1988 |
| Priority date | — |
| Expiry date | Jul 13, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/71
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control system for the boom and bucket operation system on a front end loader that includes an unloader valve responsive to pilot valve pressure to bypass hydraulic fluid pumped by an auxiliary pump to the reservoir while maintaining the primary pump supply to a loader valve which supplies pressure to the boom and bucket cylinders in response to the operation of pilot valves. The unloader valve bypasses the auxiliary pump flow when the pressure is below a predetermined value and when the pressure is above a second higher predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.