Backhoe boom cylinder bleed circuit
US4767255A · kind A · utility
6Cited by
6References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1987 |
| Grant date | Aug 30, 1988 |
| Priority date | — |
| Expiry date | Sep 28, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/425
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A bleed circuit for a backhoe boom cylinder which minimizes cylinder pressure during over-center movement of the boom while permitting the maintenance of sufficient cylinder pressure during other boom operations. The boom cylinder is provided with a retract port, a head end port, and a small bleed port with a bleed line connecting the bleed and head end ports. As the boom cylinder crosses over-center, the fluid pressure in the retract side of the boom cylinder may be transmitted from the rod end to the head end of the cylinder thereby reducing cylinder pressure and improving the over-center controlability of the boom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.