MECHANISM FOR ROTATING A TREE-FELLING IMPLEMENT AND TREE-FELLING IMPLEMENT THEREWITH

摘要

The mechanism is used for rotating a tree-fellingimplement rotatably mounted with a pivot to the distal endof the boom of a logging vehicle. The mechanism, the tree-felling implement, the boom and the logging vehicle form atree-felling machine controlled by an operator and used onlogging sites. The mechanism comprises a pinion coaxial withthe implement pivot and fixed in rotation with reference tothe distal end of the boom. An arc-shaped rack is rotatablymounted on the frame of the implement by a rack pivot inspaced relationship with the pinion. The rack is in meshwith the pinion and hydraulic actuators are provided on theframe of the implement for swaying the rack and therebyrotating the implement with reference to the boom. Suchmechanism is capable of rotating the tree-felling implementwith reference to the boom plane in both directions andaccording to a much wider range angle than the prior artmechanisms.