Device at rotator and grapple unit suspended at a boom end

Abstract From the Canadian patent

The invention relates to a device at a rotator and grapple unit intended for tree handling and suspended at the end of a boom. The rotator and grapple are connected each to a pair of flexible operating lines from a hydraulic pump via a control valve. For rendering possible completion of the unit with a hydraulic sawing device without adding two additional hydraulic hoses for this purpose, which would give rise to problems due to the combined bending and rotary movement at the crane tip and resulting heavily increased strains and wear on a bundle consisting of six hoses, according to the invention a branch line is taken from the operating line used for closing the grapple, which branch line …