WO2002035916A1 - Dispositif d'exploitation forestiere - Google Patents

Dispositif d'exploitation forestiere Download PDF

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Publication number
WO2002035916A1
WO2002035916A1 PCT/SE2001/002361 SE0102361W WO0235916A1 WO 2002035916 A1 WO2002035916 A1 WO 2002035916A1 SE 0102361 W SE0102361 W SE 0102361W WO 0235916 A1 WO0235916 A1 WO 0235916A1
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WO
WIPO (PCT)
Prior art keywords
log
cut
saw sword
saw
motor
Prior art date
Application number
PCT/SE2001/002361
Other languages
English (en)
Inventor
Jan Eriksson
Original Assignee
Jan Eriksson
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jan Eriksson filed Critical Jan Eriksson
Priority to AU2002211169A priority Critical patent/AU2002211169A1/en
Publication of WO2002035916A1 publication Critical patent/WO2002035916A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D57/00—Sawing machines or sawing devices not covered by one of the preceding groups B23D45/00 - B23D55/00
    • B23D57/02—Sawing machines or sawing devices not covered by one of the preceding groups B23D45/00 - B23D55/00 with chain saws
    • B23D57/026—Sawing machines or sawing devices not covered by one of the preceding groups B23D45/00 - B23D55/00 with chain saws with a plurality of saw chains
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G23/00—Forestry
    • A01G23/02—Transplanting, uprooting, felling or delimbing trees
    • A01G23/08—Felling trees

Definitions

  • the present invention relates to an arrangement for forest harvesting according to the preamble of the subsequent claim 1 and a method for cutting a log by means of an arrangement intended for forest harvesting according to the preamble of the subsequent claim 15.
  • Another method is based on that the cutting time is reduced as far as possible by an increase of the chain velocity of the cutting saw. Tests performed with very high chain velocities have, however, shown that it is not possible to completely eliminate the emergence of end splits in this way. Too high chain velocities will also increase the risk of chain break and should therefore be avoided.
  • a further method, which has come into use, is based on that the harvesting arrangement is lowered in the cutting moment in order to reduce the falling angle of the piece of timber that is cut.
  • the lowering has to start in the right moment, be performed with a suitable velocity and last long enough. If the lowering is carried out incorrectly the split formation might even increase instead of being reduced.
  • Systems for automatic crane lowering are being developed. However, these automatic systems will probably require an adaption of the working method resulting in a reduced harvesting capacity. Consequently, there is a need for a device or a method, which makes it possible to eliminate, or at least considerably reduce, split formations during the cutting of pieces of timber by means of a harvesting arrangement with retained high harvesting ca- pacity.
  • the object of the present invention is to provide an arrangement for forest harvesting, by means of which cutting of pieces of timber can be carried out with a minimal risk of end splits and without any appreciable negative influence on the harvesting capacity.
  • the object of the invention is achieved by the features defined in the characterizing part of the subsequent claim 1 .
  • the emergence bf end splits will be effectively prevented due to that the cutting device is adapted to effectuate a cut across the log in such a manner that the part of the mantle surface of the log facing the intended falling direction of a piece of timber released from the log by said cut is intersected in a plane essentially coinciding with the plane of the cut before the cut is completed.
  • the use of the arrangement according to the invention does not require any immediate change of the present working method for the driver of the harvesting machine and the time consumption for the cutting operation is not influenced to any larger extent.
  • the invention also relates to a method according to claim 15 for cutting a log by means of an arrangement intended for forest harvesting.
  • Fig 1 - is a schematical sectional view illustrating an embodi- ment of an arrangement for forest harvesting as seen in its position for vertical holding of a log
  • Fig 2- is a schematical front view of the arrangement according to Fig 1 as seen in the position when the log has been turned to a horizontal position
  • Fig 3 - is a schematical illustration of a cutting device comprised in an arrangement according to a first embodiment of the invention
  • Fig 4 - is a schematical illustration of a cutting device comprised in an arrangement according to a second embodiment of the invention
  • Fig 5 - is a schematical illustration of a cutting device comprised in an arrangement according to a third embodiment of the invention.
  • Fig 6 - is a schematical illustration of a cutting device com- prised in an arrangement according to a fourth embodiment of the invention
  • Fig 7 - is a schematical illustration of a cutting device comprised in an arrangement according to a fifth embodiment of the invention, as seen in a position intended for felling, and Fig 8 -. is the cutting device according to Fig 7 as seen in a position intended for cutting.
  • FIG 1 An arrangement for forest harvesting, a so-called harvester head, generally denoted with 1 , is illustrated in Fig 1.
  • This arrangement is intended to be included in a harvesting machine, which further comprises a base vehicle carrying the arrange- ment 1 by means of a crane.
  • the arrangement 1 is a so-called one grip harvesting arrangement, i.e. an arrangement adapted to grip a standing tree by gripping members 2, cut the tree by a cutting device 3, lay the tree down to the position according to Fig 2, i.e. a position in which the log extends essentially in hori- zontal direction, and then by feeding means 4 drive the log through the arrangement 1 while simultaneously branching the log by branching members 5, which are here arranged on the gripping members 2.
  • the arrangement comprises feeding means consisting of two rotatably driven feeding rolls 4 adapted to come into engagement with the tree on opposite sides thereof.
  • the cutting device 3 By means of the cutting device 3, the log can be cross-cut into individual pieces of timber, which takes place with the log extending essentially in horizontal direction.
  • the part of the log, which is to be cut off, is hanging freely outside the arrangement, whereas the remaining part of the log is held by means of the gripping members 2.
  • the cutting device 3 is arranged in a protective casing 35, a so-called saw box, which protects the cutting device during the felling operations.
  • Fig 1 the arrangement 1 is shown with a log 6, indicated with broken line, held by the gripping members 2 with the log extending in vertical direction.
  • Fig 2 the arrangement 1 and a log 6 held therein is shown after the arrangement has laid the log down to horizontal position.
  • the manoeuvring from vertical to horizontal position is carried out by means of a power mem- ber 7 in the form of a hydraulic cylinder, which is adapted to turn the part 1 a of the arrangement in which the log 6 is held in relation to the other part 1 b of the arrangement.
  • the arrangement 1 is, with respect to the parts described so far, of conventional design.
  • the arrangement 1 is provided with means for effectuating a pre-cut in the form of a kerf in the log in a plane essentially coinciding with the plane in which the cutting device 3 is intended to later complete the cut across the log, these means being adapted to achieve the kerf at least in the part of the mantle surface of the log facing the intended falling direction of a piece of timber released from the log 6 by said cut.
  • the cutting device 3 further comprises a cut- ting member adapted to meet said kerf during the completion of the cut across the log.
  • the term falling direction refers to the direction in which a piece of timber, which has been released from a log by the cutting device of the arrangement, falls due to gravity after the release.
  • the term cut refers to the cut which is achieved across the log by the cutting device of the arrangement and which separates a piece of timber from the remaining part of the log.
  • the term kerf refers to an incision in the log which forms part of the cut and which extends a certain distance in the circumferential direction of the log at the part of the mantle surface facing the falling direction, i.e. facing the ground, and a certain distance into the log, the dimensions and orientation of the kerf being such that the risk of end splits is considerably reduced when a piece of timber is separated from the log by said cut.
  • End splits are normally caused by strains in the area of the log located at the part of the mantle surface of the log facing the falling direction.
  • a pre-cut in the form of a kerf which, as seen in a cross section through the log, covers this area critical as concerns the emergence of end splits, and then letting the cutting member meet this kerf, the emergence of said strains in this area is eliminated in the cutting moment. In this way, no end splits can emerge in the area in question and the risk of end splits is therefore reduced to a minimum.
  • the size of the area critical as concerns the emergence of end splits varies in dependence on inter alia the sort of wood and the diameter of the log, for what reason also the required dimensions of said kerf varies in dependence on these parameters.
  • the required dimensions of the kerf in the individual cases can for instance be determined by empirical tests or by means of computer based calculating methods.
  • Figs 3-6 show schematical illustrations of different designs of cutting devices included in an arrangement according to the first variant of the invention.
  • the intended movement pattern of the cutting devices In order to illustrate the intended movement pattern of the cutting devices as clear as possible, only the cutting members included in the cutting devices and their intended movements in relation to a log 6 held in the arrangement are shown in these figures.
  • the falling direction of a piece of timber released from the log 6 by the cut is marked with F i Figs 3-6.
  • Fig 3 shows a schematical illustration of a cutting device included in an arrangement according to a first embodiment of the invention.
  • the cutting device 3 here comprises a cutting member 8 in the form of a saw sword, which is pivotably mounted in relation to a motor 9 and comprises a saw chain driven by the motor.
  • the saw sword 8 is in a conventional manner rotatable in relation to the motor 9.
  • the saw sword 8 is pivotably mounted to the motor 9 in such a manner that the axis of rotation 10 of the saw sword in relation to the motor 9 extends across the motor 9.
  • the pre-cut is here achieved by the saw sword 8, which together with the motor 9 is movable between a first position 1 1 , illustrated with continuous line in Fig 3, in which the saw sword is intended to complete the cut, and a second position 12, illustrated with broken line in Fig 3, in which the saw sword is intended to effectuate the pre-cut.
  • Said first position 1 1 also constitutes the protected resting position of the saw sword, i.e. the position in which the saw sword is protected in the protective casing 35.
  • the saw sword 8 and the motor 9 are in the second position 12 located on the opposite side of the log 6 as seen in relation to the first position 1 1 .
  • the saw sword 8 is to- gether with the motor 9 moved from the first position 1 1 to the second position 12, in which second position the pre-cut is effectuated by rotation of the saw sword 8 in relation to the motor 9 about the axis of rotation 10 in the direction marked with the arrow 13.
  • the saw sword 8 is together with the motor 9 returned to the original first position 1 1 in order to complete the cut that intersects the log 6 and separates a piece of timber from it.
  • the cut is completed in a conventional manner by rotation of the saw sword 8 in relation to the motor 9 about the axis of rotation 10 in the direction marked with the arrow 14.
  • the saw sword 8 is adapted to move in essentially one and the same plan all the time, namely in the plane in which the saw sword has its main extension.
  • This plane is suitably arranged to extend essentially perpendicular to the longitudinal direction of a log 6 held in the arrangement. Consequently, the kerf S obtained by the pre-cut will lay essentially in the same plane as the later effectuated part of the cut.
  • the saw sword 8 can also be adapted to effectuate a part of the cut during its movement from the second position to the first position after the effectuation of the pre-cut. In this way, the time for the completion of the cutting operation is reduced at the same time as the safety against end splits are further increased. This cutting during the movement can with advantage be used when cutting very thick logs.
  • the saw sword is moved from the first 1 1 to the second 12 position in that the motor 9, to which the saw sword is attached, is made to move along a guide, schematically indicated at 15 in Fig 3, provided in the ar- rangement.
  • the guide 15 is, as shown in Fig 3, arranged in an arc about a log 6 held in the arrangement 1 .
  • the motor 9 can for instance be adapted to move along the guide by means of a gear mechanism, in which case the guide comprises a gear rack and the motor is provided with a gear wheel engaging with the gear rack. By driving the gear wheel in rotation in a suitable manner, the motor can be moved along the guide in one direction or the other.
  • the protective casing 35 accommodating the motor 9 and the saw sword 8 to-and-fro between the first 1 1 and the second 12 position illustrated in Fig 3, the protective casing
  • the motor 9 would in a conven- tional manner be fixed directly in the protective casing 35 and, consequently, not be movable in relation to the protecting casing
  • Fig 4 shows a schematical illustration of a cutting device in- eluded in an arrangement according to a second embodiment of the invention.
  • the cutting device 3 also here comprises a cutting member 8 in the form of a saw sword, which is rotatably mounted in relation to a motor 9 and comprises a saw chain driven by the motor.
  • the saw sword is in a conventional manner rotatable in relation to the motor.
  • the saw sword 8 is rotatably mounted to the motor 9 in such a manner that the axis of rotation 10 of the saw sword in relation to the motor 9 extends across the motor 9.
  • the pre-cut is here achieved by the saw sword 8, which is movable between a first position 1 1 , illustrated with continuous line in Fig 4, in which the saw sword is intended to complete the cut, and a second position 12, illustrated with broken line in Fig 4, in which the saw sword is intended to effectuate the pre-cut.
  • Said first position 1 1 also constitutes the protected resting position of the saw sword, i.e. the position in which the saw sword is protected in the pro- tective casing 35.
  • the movement of the saw sword from the first position to the second position and vice versa takes place by rotation of the saw sword 8 about its axis of rotation 10.
  • the saw sword 8 is at the initiation of a cutting operation located in the first position 1 1 and is by rotation about the axis of rotation 10, in the direction marked with the arrow 16, moved to the second position 12, in which the pre-cut is effectuated by rotation of the saw sword a further distance in the direction marked with the arrow 16.
  • the saw sword 8 is returned to the first position 1 1 by rotation about the axis of rotation 10, in the direction marked with the arrow 17, whereafter the cut is completed by rotation of the saw sword a further distance in the direction marked with the arrow 17.
  • the saw sword is returned to the original first position 1 1 .
  • the saw sword is not brought back to the first position 1 1 after the effectuation of the cut, but is instead rotated a further distance in the direction marked with the arrow 17 so that it directly occupies the second position 12 awaiting the initiation of a new cutting operation.
  • the saw sword 8 When a felling operation is to be performed, i.e. when a new tree is to be felled by means of the arrangement 1 , the saw sword 8 must however, be returned to the protected resting position 1 1 .
  • the saw sword 8 is suitably provided with a saw chain having saw members whose sawing function is independent of the driving direction of the saw chain.
  • the saw sword can however also be provided with a saw chain having saw members which are only effective in a certain driving direction of the saw chain in relation to the log.
  • the motor is adapted to drive the saw chain in a first direction about the saw sword, for completing said cut, when the saw sword is located in the first position, and in a second direction about the saw sword, opposite the first direction, for effectuating the pre-cut, when the saw sword is located in the second position.
  • the saw sword is adapted to move essentially in one and the same plane all the time, namely in the plane in which the saw sword has its main extension. This plane is suitably arranged to extend essentially perpendicular to the longitudinal direction of a log held in the arrangement.
  • Fig 5 shows a schematical illustration of a cutting device included in an arrangement according to a third embodiment of the invention.
  • the cutting device 3 also here comprises a cutting member 8 in the form of a saw sword, which is rotatably mounted in relation to a motor 9 and comprises a saw chain driven by the motor 9.
  • the saw sword 8 is in a conventional manner rotatable in relation to the motor 9 about a first axis of rotation 10, which in the shown embodiment extends across the motor 9.
  • the saw sword 8 is furthermore rotatable together with the motor 9 about a second axis of rotation 18, which is essentially parallel with the first axis of rotation 10.
  • the saw sword 8 is here adapted to be moved from the first position 1 1 , illustrated with continuous line in Fig 5, to the second position 12, illustrated with broken line in Fig 5, by a rotation of the saw sword 8 together with the motor 9 in a first direction, marked with the arrow 19, about the second axis of rotation 18, and from the second position 12 to the first position 1 1 by a rotation of the saw sword together with the motor in a second direction, market with the arrow 20, about the second axis of rotation 18.
  • Said first position 1 1 also constitutes the protected resting posi- tion of the saw sword, i.e. the position in which the saw sword is protected in the protecting casing 35.
  • the saw sword 8 When the saw sword 8 is located in the second position 12, the saw sword 8 can be pressed against the log 6 in order to effec- tuate the pre-cut, either by being rotated together with the motor
  • the motor is carried by an arm 23, which arm is pivotably mounted to an axle 24, the centre axis of which coincides with said second axis of rotation 18. So as to make it possible for the arm 23 to go free from a log 6 held in the arrangement 1 during the movement of the saw sword 8 from the first to the second position, the arm 23 has a concaveness on the side 25 intended to face the log.
  • the rotation of the arm 23, and thereby the rotation of the saw sword 8 and the motor 9, about the second axis of rotation 18 is suitably achieved by means of a not shown hydraulic motor.
  • the protective casing 35 itself could instead be movably mounted in the arrangement so as to be displaceable in relation to the log in the circumfer- ential direction of the log.
  • the motor 9 and the saw sword 8 would consequently be moved to-and-fro between the first 1 1 and second 12 position illustrated in Fig 5 by being moved about the log together with the protective casing 35.
  • the motor 9 could in a conventional manner be fixed directly in the protective casing 35 and, consequently, not via any movable arm of the type illustrated in Fig 5.
  • Fig 6 shows a schematical illustration of a cutting device com- prised in an arrangement according to a fourth embodiment of the invention.
  • the cutting device 3 here comprises a first cutting member 8 in the form of a saw sword, which is pivotably mounted in relation to a motor 9 and comprises a saw chain driven by the motor 9.
  • the saw sword 8 is in a conventional manner rotatable in relation to the motor 9 about an axis of rotation 10, which in the shown embodiment extends across the motor 9.
  • the cutting device 3 further comprises a second cutting member 28 in the form av a saw sword, which is pivotably mounted in relation to a motor 29 and comprises a saw chain driven by the motor 29.
  • the saw sword 28 is in a conventional manner rotatable in relation to the motor 29 about an axis of rotation 30, which in the shown embodiment extends across the motor 29.
  • the first cutting member 8 is adapted to complete said cut and corresponds to the cutting member which today is present in conventional harvesting arrangements.
  • the second cutting member is adapted to effectuate the pre-cut and its saw sword 28 can for instance, as shown in Fig 6, be adapted to be moved from a protected resting position 31 (marked with continuous line in Fig 6) in the protective casing 35 to an activation position 32 (marked with broken line in Fig 6) by rotation of the saw sword 28 in relation to the motor 29 about the axis of rotation 30 in the direction marked with the arrow 33.
  • the saw sword 28 of the second cutting member When the saw sword 28 of the second cutting member is located in the activation position 32, the saw sword 28 is pressed against the log 6 in order to effectuate the pre-cut by rotation of the saw sword 28 in relation to the motor 29 a further distance in the direction marked with the arrow 33.
  • the saw sword 28 of the second cutting member does not have to return completely to the resting position 31 , on the contrary it only has to be returned, by a rotation about the axis of rotation 30 in the direction marked with the arrow 34, to a position in which the saw sword goes free from the piece of timber cut off by the later completed cut when this piece of timber falls to the ground in the falling direction F.
  • the saw sword 28 of the second cutting member must, however, be returned to the protected resting position 31 .
  • the two saw swords 8, 28 are adapted to move essentially in one and the same common plane all the time, namely in a plane in which the two saw swords have their main extension.
  • This plane is suitably arranged to extend essentially perpendicularly to the longitudinal direction of a log 6 held in the arrangement.
  • the saw swords are before the effectuation of a felling operation intended to be protected in a protective casing 35, the design of which naturally has to be adapted to the design of the cutting device and the movement pattern of the saw swords.
  • Figs 7 and 8 show schematical illustrations of a cutting device comprised in an arrangement according to a second variant of the invention.
  • the arrangement 1 is also here provided with a cutting device 3 comprising a cutting member 8 in the form of a saw sword, which is pivotably mounted in relation to a motor 9 and comprises a saw chain driven by the motor.
  • the saw sword 8 is in a conventional manner rotatable in relation to the motor 9.
  • the saw sword 8 is pivotably mounted to the motor 9 in such a manner that the axis of rotation 10 of the saw sword in relation to the motor 9 extends across the motor 9.
  • the cutting member 8 of the cutting device 3 illustrated in Figs 7 and 8 is displaceable between a first position, illustrated in Fig 7, in which the cutting member 8 is intended to effectuate a felling of a tree, and a second position, illustrated in Fig 8, in which the cutting member 8 is intended to effectuate a cut in a log in order to separate a piece of timber from a previously felled log.
  • Fig 7 shows the cutting device 3 with the saw sword 8 arranged in the first position intended for felling.
  • the shown log 6 extends essentially in vertical direction in Fig 7.
  • the saw sword 8 when it has just com- pleted the sawing through of the log, i.e. in the moment when the saw sword completely has intersected the log, has its main extension, i.e. its longitudinal direction, essentially perpendicular to the felling direction of the tree. This is particularly important when felling large and heavy trees. This eliminates the risk that the tree will come to rest on the tip of the saw sword after the sawing through and thereby bend the saw sword with damages thereon as a result.
  • the saw sword 8 is protectively located in the protective casing 35 in the position illustrated with continuous line in Fig 7.
  • the saw sword 8 is located in the position illustrated with broken line in Fig 7, in which position the saw sword 8 as shown has its main extension, i.e. its longitudinal direction, essentially perpendicular to the felling direction of the tree.
  • the felling direction of a log 6 felled by means of the cutting device 3 is marked with f in Fig 7.
  • the felling is effectuated in a conventional manner by rotation of the saw sword 8 in relation to the motor 9 about the axis of rotation 10 in the direction marked with the arrow 40.
  • Fig 8 shows the cutting device 3 with the saw sword 8 arranged in the second position, intended for cutting, after the log 6 has been felled by means of the cutting device 3 and has been laid down by the arrangement to an essential horizontal position for cross-cutting of the log into pieces of timber. Consequently, the shown log 6 extends essentially in horizontal direction in Fig 8.
  • the saw sword 8 is in the position intended for cutting displaced in relation to the log 6 as compared to its position intended for felling. This displacement is such that the saw sword 8 during the effectuation of the cut across the log 6 will saw through the area of the log critical as concerns the emergence of end splits before the saw sword 8 completely intersects the log.
  • end splits normally emerge by strains in the area of the tree located at the part of the mantle surface of the tree facing the falling direction.
  • the area of the log which is critical as concerns the emergence of end splits, before the saw sword 8 completely intersects the log and separates a piece of timber therefrom, the emergence of said strains in this area at the moment when the cut is com- pleted is eliminated. In this way, no end splits can emerge in the area in question, and the risk of end splits is therefore reduced to a minimum.
  • the size of the area critical as concerns the emergence of end splits varies depending on inter alia the sort of wood and the diameter of the log, wherefore also the required position of the saw sword 8 in relation to the log 6 in the cutting operation varies depending on these parameters.
  • the required position of the saw sword 8 in the individual cases can for instance be determined by means of empirical tests or by means of computer based calculation methods.
  • the falling direction of a piece of timber released from the log 6 via the cut is marked with F in Fig 8.
  • the saw sword 8 Before the effectuation of the cut, the saw sword 8 is located in the position illustrated with continuous line in Fig 8. During the sawing through, i.e. just after the cut has been completed, the saw sword 8 is located in the position illustrated with broken line in Fig 8, in which position the saw sword 8 as shown already has sawn through the area critical as concerns the emergence of end splits. This area, which it critical as concerns the emergence of end splits, is in Fig 8 illustrated by the hatched area 42.
  • the cut is effectuated in a conventional manner by rotation of the saw sword 8 in relation to the motor 9 about the axis of rotation 10 in the direction marked with the arrow 43.
  • the saw sword 8 is moved from the felling position illustrated in Fig 7 to the cutting position illustrated in Fig 8, and vice versa, by movement of the motor 9, to which the saw sword is attached, along a guide provided in the arrangement 1 , which guide is schematically indicated at 41 in Fig 8.
  • the motor 9 can for instance be adapted to move along the guide by means of a gear mechanism, in which case the guide comprises a gear rack and the motor is provided with a gear wheel engaging with the gear rack. By driving the gear wheel in rotation in a suitable manner, the motor can be moved along the guide in one direction or the other.
  • the motor 9 could be displaced between the mentioned positions by means of a hydraulic cylinder.
  • the protective casing 35 itself could instead be movably mounted in the arrangement so as to be displaceble in relation to the log in the circumferential direction of the log.
  • the motor 9 and the saw sword 8 would consequently be moved to-and-fro between the positions in question by being moved about the log together with the protective casing 35.
  • the motor 9 would in a conventional manner be fixed in the protective casing 35 without being dis- placeable in relation to this, and consequently without being movable in relation to the protecting casing 35 via a guide of the type illustrated in Fig 8.

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  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Forests & Forestry (AREA)
  • Environmental Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Sawing (AREA)

Abstract

L'invention concerne un agencement d'exploitation forestière comprenant des moyens (2,4) de maintien et d'avance d'une bille (6), et un dispositif (3) de coupe de ladite bille (6) maintenue. Le dispositif (3) de coupe de l'agencement est conçu pour effectuer une coupe transversale de ladite bille (6) de sorte que l'enveloppe de la bille tournée vers le sens de chute voulu (F) d'une pièce de bois retirée de la bille par ladite coupe, coupe un plan correspondant sensiblement avec le plan de la coupe avant la fin de la coupe. L'invention concerne également un procédé de coupe d'une bille au moyen d'un agencement destiné à l'exploitation forestière.
PCT/SE2001/002361 2000-10-30 2001-10-29 Dispositif d'exploitation forestiere WO2002035916A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002211169A AU2002211169A1 (en) 2000-10-30 2001-10-29 A device for forestry

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0003970A SE521373C2 (sv) 2000-10-30 2000-10-30 Aggregat för avverkning av skog
SE0003970-1 2000-10-30

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Publication Number Publication Date
WO2002035916A1 true WO2002035916A1 (fr) 2002-05-10

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SE (1) SE521373C2 (fr)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008092425A1 (fr) * 2007-01-29 2008-08-07 Wolfgang Kipple Dispositif de sciage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726326A (en) * 1971-12-06 1973-04-10 T Coleman Tree felling machine
SE409431B (sv) * 1978-04-17 1979-08-20 Ostbergs Fabriks Ab Anordning vid kapning av fellda tred
US4281693A (en) * 1979-07-18 1981-08-04 Forest Engineering Research Institute Of Canada Feller director

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726326A (en) * 1971-12-06 1973-04-10 T Coleman Tree felling machine
SE409431B (sv) * 1978-04-17 1979-08-20 Ostbergs Fabriks Ab Anordning vid kapning av fellda tred
US4281693A (en) * 1979-07-18 1981-08-04 Forest Engineering Research Institute Of Canada Feller director

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Instruktionsbok fur mcculloch motorsagar", AB ELECTROLUX, MOD. 1-51, 1960, pages 6 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008092425A1 (fr) * 2007-01-29 2008-08-07 Wolfgang Kipple Dispositif de sciage

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Publication number Publication date
SE521373C2 (sv) 2003-10-28
SE0003970D0 (sv) 2000-10-30
SE0003970L (sv) 2002-05-01
AU2002211169A1 (en) 2002-05-15

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