Arrangement with a tree felling unit

Details Arrangement with a tree felling unit Arrangement with a tree felling unit

F - Mech Eng,Light,Heat,Weapons

15

B

144/27, 138/69.1

F15B 13/02 (2006.01) A01G 23/08 (2006.01)

Patent

CA 1038727

A B S T R A C T At the end of a crane arm on a base vehicle is fixed a frame, the inclination of which is controlled by double-acting hydraulic cylinders, and which supports hydraulically operated grip arms and a cutting unit. The frame is with a estimated inclination moved against a tree and the grip arms urge the frame to conformance with the actual inclination of the tree, thereby inducing strains in the tree as well as the firmly based crane arm. A valve connect- ing the inlet and outlet of each hydraulic cylinder is momentaneous- ly opened from its hitherto closed position, so that the fluid in the cylinder is forced to equalize under the strains from the biased tree which consequently will be relieved from tension before cutting, otherwise resulting in cracks in the root end of the tree.

228699

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