Earthworking machine of the loader type
US4376612A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1981 |
| Grant date | Mar 15, 1983 |
| Priority date | — |
| Expiry date | May 12, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/308
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention relates to a hydraulic loader comprising a boom, a balance beam and a bucket for loading material, boom jacks and balance beam jacks being coupled between the frame and the boom and between the boom and the balance beam. A secondary jack is also coupled between the frame and the boom and comprises an active chamber, while a first conduit connects this active chamber to the extension chamber of the balance beam jack and a first cut-off valve is disposed in this first conduit, establishing, in its first position, communication of the two sections of the first conduit which are connected thereto, isolating, on the contrary, in its second position, these two sections. One application of the invention is the production of a powerful and efficient loader.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.