PRUNING DEVICE, AND DESCENDING/ELEVATING WORK DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a pruning device prevented from occurrence of branch-bite to reduce thrust required for revolving around a tree trunk when performing pruning work while revolving around the tree trunk so as to smoothly perform pruning; and to provide a descending/elevating work device elevating while smoothly performing pruning. SOLUTION: The pruning device is structured as follows: a guide bar 71 includes guide rail members 74 and 75 movably supporting a branch-bite preventive member 90 while making a circular locus along the peripheral surface of the tree trunk, and coil springs 97 and 98; the branch-bite preventive member 90 includes an end part on the pruning direction side narrower than the blade width of a chain saw teeth 72. The cutting motion of the chain saw teeth 72 and an action of the guide bar 71 in a pruning direction can be performed under the condition that the end part on the pruning direction side is put between the cut faces of a branch being cut. COPYRIGHT: (C)2011,JPO&INPIT