| 摘要 |
PROBLEM TO BE SOLVED: To provide a branch-trimmer capable of trimming branches from above a tree, by suspending the branch-trimmer in the air with an aerially heavy weight- conveying device (specified in the patent application of JP 2002-174688) to motor. SOLUTION: This branch-trimmer has a cylindrical frame 1 which is structured so as to surround the trunk of the tree and suspended to be moored in the air with the aerially heavy weight-conveying device (specified in the above) not shown in the drawing, a plurality of chain saws 2 horizontally attached to the cylindrical frame 1, guide bars 3 of which have each a trapezoidal projection 4 in the middle part so that the chain saws 2 are positioned at a certain distance from the bark of the tree, a guide bar-pressing unit 5 for pressing the guide bars 3 against the bark with predetermined force so that the core of the tree is made to position at the center of a closed space between the chain saws 2 so arranged as to form a polygonal shape, a hydraulic motor 6 for rotationally driving the chain saws 6, a hydraulic rotary cylinder 7 for driving the guide bar-pressing unit, a remote-controlled controller 8, and an engine- driven dynamo-type power source 9. An operator manipulates the branch-trimmer thus structured while confirming a monitor of the remote-controlled controller located on the ground.
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