Single-grip harvester head for felling and processing of trees

A - Human Necessities – 01 – G

Patent

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A01G 23/08 (2006.01) A01G 23/081 (2006.01) B27B 25/02 (2006.01)

Patent

CA 2291613

A single-grip harvester head comprises a frame (1, 2), which defines a tree feeding path, and two feeding roller arms (5), which are pivotable in relation to the frame (1, 2) about a pivot axis (A1) each defined by a pivot pin (6) and which support a rotatable feeding roller (7) each. Each feeding roller arm (5) is formed as an angular lever with two lever legs (5a, 5b), the feeding roller (7) being supported at the free end of one of the legs (5a) and the pivot pin (6) of the feeding roller arm (5) being positioned in the angular area between the legs. The two pivot axes (A1) are located in a common plane perpendicular to the tree feeding path. Each pivot pin (6) is articulated to the frame (1, 2) at one of its ends by means of a ball joint (13) and controlled at its other end, in such a way that the pivot axis (A1) is movable in said plane but fixed in a direction perpendicular to this plane. The other leg (5b) of each feeding roller arm (5) is articulated to a slide (17) by means of a ball joint (16), which slide is reciprocatable in the direction of the tree feeding path in relation to the frame (1, 2) to maintain, in the pivoting of the feeding roller arms (5), a constant distance between the ball joints (16) by means of which the arms (5) are articulated to the slide (17).

L'invention concerne une tête d'abattage-ébranchage à prise unique comprenant un cadre (1, 2) qui définit une voie d'alimentation en arbres, et deux bras (5) supports de rouleaux d'alimentation qui tournent par rapport au cadre (1, 2) autour d'un axe de pivotement (A1) défini par un pivot (6). Chaque bras (5) supporte un rouleau d'alimentation (7) et est réalisé sous forme de levier angulaire à deux branches (5a, 5b), le rouleau d'alimentation (7) étant supporté à l'extrémité libre de l'une des branches (5a) et le pivot (6) du bras (5) support de rouleau étant positionné dans la zone angulaire située entre les deux branches. Les deux axes de pivotement (A1) sont situés dans un plan commun perpendiculaire à la voie d'alimentation en arbres. Chaque pivot (6) est articulé, à l'une de ses extrémités, au cadre (1, 2) par un joint à rotule (13) et commandé à son autre extrémité de telle manière que l'axe de pivotement (A1) soit mobile dans ce plan mais fixe par rapport à ce plan dans une direction perpendiculaire. L'autre branche (5b) de chaque bras (5) est articulée à un chariot (17) par un joint à rotule (16). Ce chariot (17) peut se déplacer par rapport au cadre (1, 2) dans un mouvement de va-et-vient dans la direction d'alimentation en arbres afin de maintenir, lors du basculement des bras (5) supports de rouleau, une distance constante entre les joints à rotule (16) à l'aide desquels les bras (5) sont articulés au chariot (17).

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