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Four Arm Debarking Blade

IP.com Disclosure Number: IPCOM000240218D
Publication Date: 2015-Jan-14
Document File: 2 page(s) / 58K

Publishing Venue

The IP.com Prior Art Database

Abstract

It is important when harvesting eucalyptus to be able to remove the tree limbs and greater than 95% of the bark from the stem when it is felled and processed into log lengths. To achieve this through a forestry harvesting head, a rugged debarking knife is arranged which consists a plurality of knife segments mounted to right and left hand arm assemblies constructed and powered in such a way that the knife segments closely embrace a tree stem and maintain substantially complete circumferential engagement of the stem as the stem diameter changes during debarking operation when the stem is moved longitudinally relative to the debarking knife arrangement. The forestry harvesting head is equipped with debarking blade arrangement with a pair of central blades directly pivotally mounted at a lower central region of the forestry harvesting head and includes four other blades respectively pivotally mounted to outer ends of four blade support arms. The four arms include first and second pairs of opposed, pivotally mounted right- and left- hand arms, wherein the left- hand arm of the first pair, and the right-hand arm of the second pair are each shorter than the right-hand arm of the first pair, and the left-hand arm of the second pair. First and second hydraulic cylinders are respectively connected between each of the first and second pairs of arms, with the long arm of each of the pairs of arms engaging a stop preventing further inward pivoting once a certain diameter of tree stem has passed through the debarking zone defined by the blade arrangement.

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P22371 - Four Arm Debarking Blade

It is important when harvesting eucalyptus to be able to remove the tree limbs and greater than 95% of the bark from the stem when it is felled and processed into log lengths.

To achieve this through a forestry harvesting head, a rugged debarking knife is arranged which consists a plurality of knife segments mounted to right and left hand arm assemblies constructed and powered in such a way that the knife segments closely embrace a tree stem and maintain substantially complete circumferential engagement of the stem as the stem diameter changes during debarking operation when the stem is moved longitudinally relative to the debarking knife arrangement.

The forestry harvesting head is equipped with debarking blade arrangement with a pair of central blades directly pivotally mounted at a lower central region of the forestry harvesting head and includes four other blades respectively pivotally mounted to outer ends of four blade support arms. The four arms include first and second pairs of opposed, pivotally mounted right- and left- hand arms, wherein the left- hand arm of the first pair, and the right-hand arm of the second pair are each shorter than the right-hand arm of the first pair, and the left-hand arm of the second pair. First and second hydraulic cylinders are respectively connected between each of the first and second pairs of arms, with the long arm of each of the pairs of arms engaging a stop preventing further inward pivoting once...