A LOGGING GRAPPLE

摘要

A grapple comprising a grapple head to which is pivotallymounted left and right tongs. Two double acting hydrauliccylinders extend between the tong pivot points and the othertong. The piston side of the hydraulic cylinders arehydraulically coupled together by a closed center flow dividervalve. A cross over relief valve assembly is mounted inparallel with the flow divider valve.