Logging grapple
US5558380A · kind A · utility
8Cited by
14References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1994 |
| Grant date | Sep 24, 1996 |
| Priority date | — |
| Expiry date | Sep 19, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C1/585
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A grapple comprising a grapple head to which is pivotally mounted left and right tongs. Two double acting hydraulic cylinders extend between the tong pivot points and the other tong. The piston side of the hydraulic cylinders are hydraulically coupled together by a closed center flow divider valve. A cross over relief valve assembly is mounted in parallel with the flow divider valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.