A - Human Necessities – 01 – G
Patent
A - Human Necessities
01
G
A01G 23/083 (2006.01)
Patent
CA 2394680
The invention relates to a device and a method for a tree harvester head for trimming tree trunks. The device includes a frame (1) supporting feed rollers (2), one or more trimming knives (4) that pivot towards and away from the tree trunk, as well as a trimming knife (6) permanently fixed to the frame (1) and with a radius of curvature that is essentially equivalent to the radii of curvature of the pivoting trimming knives (4). A complementary trimming knife (7) is arranged in a displaceable manner at the frame and affected by a force of spring tension (9) in a direction towards the tree trunk that is to be worked, whereby the complementary trimming knife (7) has an area of grip around the tree trunk that is significantly less than the area of grip of the pivoting trimming knives (4) or the fixed trimming knife (6) when working the butt end of the trunk, and an area of grip around the tree trunk that is greater than the area of grip of the pivoting trimming knives (4) or the fixed trimming knife (6) when working the top end of the trunk for trimming the trunk from its butt end to its top end.
Cette invention a trait à un appareillage ainsi qu'au procédé correspondant relatifs à la tête d'une abatteuse de bois destinée à l'ébranchage de troncs d'arbre. Cet appareillage comporte un châssis (1) soutenant des rouleaux d'amenage (2), un ou plusieurs couteaux de taille (4) pivotant autour du tronc, ainsi qu'un couteau de taille (6) fixé à demeure sur le châssis (1) et dont le rayon de courbure est sensiblement similaire de ceux des couteaux de taille (4) pivotants. Un couteau de taille supplémentaire (7) est monté amovible sur le châssis et est sollicité par une force de tension de ressort (9) en direction du tronc d'arbre. La surface de préhension de ce couteau supplémentaire (7), autour du tronc, qui est notablement inférieure à celle des couteaux de taille (4) pivotants ou à celle du couteau de taille (6) fixe au moment de travailler sur le talon du tronc, est, en revanche, supérieure à celle des couteaux de taille (4) pivotants ou à celle du couteau de taille (6) fixe au moment de travailler sur la cime de l'arbre et ce, afin d'ébrancher le tronc du talon à la cime.
Englund Tommy
Nilsson Gunnar
Samson Leo
Fetherstonhaugh & Co.
Partek Forest Ab
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