WO1995001094A1 - Wood harvester - Google Patents
Wood harvester Download PDFInfo
- Publication number
- WO1995001094A1 WO1995001094A1 PCT/SE1993/000601 SE9300601W WO9501094A1 WO 1995001094 A1 WO1995001094 A1 WO 1995001094A1 SE 9300601 W SE9300601 W SE 9300601W WO 9501094 A1 WO9501094 A1 WO 9501094A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- saw
- shearing
- wood
- cutting
- knife
- Prior art date
Links
Classifications
-
- 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
- A01G23/091—Sawing apparatus specially adapted for felling trees
Definitions
- the present invention relates to a wood harvester which includes a cutting assembly.
- Two main methods are used in the forest industry to separate roots from tree trunks and for cutting tree trunks in general, namely sawing and shearing.
- Sawing is primarily required when logging large-diameter tree trunks intended for use in timber and pulp production, where high demands are placed on the quality of the cut surface, so as to avoid the formation of cracks and splinters that may impair the raw timber or pulp material.
- Shearing is primarily suited for application with trunks of smaller diameter in conjunction with forest cleaning-thinning work and energy-wood felling, and also when cutting or logging large-diameter tree trunks which have been damaged in some way or another and which are therewith rendered unsuitable as raw material for the manufacture of timber and pulp.
- An object of the present invention is to provide a wood harvester of the aforedescribed kind whose cut ⁇ ting unit is able to effect a cutting operation either by sawing or by shearing, therewith avoiding the aforesaid drawbacks and affording a greater degree of freedom.
- the cutting unit of the wood harvester includes a pair of shearing devices of which at least one is drivable in relation to the other in a first plane between an open position and a shearing terminal position, and further includes a sawing device which can be driven in a second plane which extends generally parallel to the first plane, between a rest position and a saw terminal position, wherein when in its rest position the saw means is located in such a way close to one of the shearing devices that said shearing device in said open posi ⁇ tions will form a bottom guard for the saw means prior to operating said saw means or said at least one shearing device.
- FIGURE 1 is a top view of a bottom part of a wood harvester according to the invention
- FIGURE 2 is a side view of the harvester illustrated in FIGURE 1
- FIGURE 3 is a top view of a modified version of the harvester illustrated in FIGURE l and shows the har ⁇ vester in a shearing terminal position
- FIGURE 4 illustrates a modified version of the harvester illus ⁇ trated in FIGURE 1 and shows the harvester in a saw terminal position
- FIGURE 5 is a schematic sec ⁇ tional view taken on the line 5-5 in FIGURE 4.
- the inventive wood harvester 10 which is shown only partially in the drawings, is intended to be fitted to the crane arm of, an excavating machine or digger for instance, and includes a bottom frame part 12, which in the illustrated embodiment extends at an angle from a vertical centre beam 20 on the harvester. It is assumed that a pair of gripping arms and optionally also a trunk-gathering device, for instance of the type disclosed in US-A 5,083,595, are mounted in a known manner on that part of the central beam 20 which is not shown in the drawing.
- the illustrated harvester 10 is also constructed as a so-called tree plucker and is provided with a ground support 14 which is able to thrust against an underly ⁇ ing surface 80 and fell or cut a tree grasped by the gripping arms (not shown) through the agency of a lever-arm effect, by plucking the tree from the ground with its root attached, which is another tree harvest ⁇ ing method.
- the invention can also be applied advantageously with wood harvesters that lack the provision of a ground support 14.
- a cutting unit 30 Mounted close to the bottom end of the frame part 12, in the vicinity of the ground support 14, is a cutting unit 30 which, in accordance with the invention, includes a shearing device 40 and a saw means in the form of a chain saw 60 mounted closely above the shearing device.
- the shearing device 40 includes a pair of shearing elements 42, 42, each of which comprises a relatively thick knife-frame 44 and a relatively thin shearing or cutting wedge or knife 46, which is secured to the knife-frame 44 by means of screw joints 48.
- the upper sides of the knife- frame 44 and the cutting knife 46 lie essentially in mutually the same plane, so that the relatively thick- er knife frame 44 projects down beyond the underside of the cutting knife 46.
- the shearing device 40 obtains a generally flat upper side which enables the chain saw 60 to be placed very close to the shearing device 40 and therewith protected by said device from beneath, and also enables the upper side of the shearing device to serve as a flat supportive surface for several trunks when using the aforesaid trunk gathering function. As indicated in FIG.
- the "reversed" positioning of the knife frame 44 of the shearing device 40 will not, in practice, present an obstacle to cuts that are made close to the root of the tree, since the ground part 84 which embraces the root-end of the tree 82 to be felled will normally slope downwardly and outwardly from the tree and thereby leave space for the downwardly projecting knife-frame 44, even when cutting the tree close to its root.
- the downwardly extending parts of the knife-frame 44 will not prevent the shearing elements 42, 42 from closing, for in ⁇ stance by coming into contact with the edges of up ⁇ wardly turned cutting surfaces on the tree, those sides 43 (only one of which is shown in FIG. 5) of the knife frame 44 that border on the cutting knife 46 converge at an acute angle towards the cutting knife 46 in its cutting direction, so that they can slide more easily past such edges.
- Each of the two shearing elements 42, 42 are pivotally journalled on a respective journal shaft 22 (only one of which is shown in FIG. 2), the upper end of which is connected to a tree-capturing plate 26 (see also FIG. 1), which in turn is connected to the frame part 12 via a reinforcing plate 24, and the bottom end of which is connected to a bottom plate 18 on the ground support 14, via a bearing attachment 28.
- the bottom plate 18 forms a large abutment surface against the underlying support, and also provides protection for the hydraulic piston-cylinder devices 50, 50 against irregularities in the underlying support surface 80.
- the two shearing elements 42, 42 are driven for pivot ⁇ al movement about their respective journal shafts 22 between an open position (FIG. 1) and a shearing terminal position (FIG. 3) by a respective hydraulic piston-cylinder device 50, for instance for severing a bouquet of a plurality of more slender tree trunks or stems 86.
- a respective hydraulic piston-cylinder device 50 for instance for severing a bouquet of a plurality of more slender tree trunks or stems 86.
- One end of respective hydraulic devices 50 is pivotally journalled on one outer surface of the ground support 14 while the end of the piston rod of each hydraulic device is pivotally journalled to a rear, outer corner of respective shearing elements 42.
- the shearing device is better suited than a chain saw for cutting large-diameter untrimmed trunks, the branches of which are liable to guide a saw-guide bar away from the intended cutting plane, with possible damage to the chain saw as a result.
- the chain saw 60 may be comprised of a known saw unit, having a saw-guide bar 64 which for cutting, e.g. , a tree trunk 82 is constructed so as to be swung out and in between a rest position (FIGS. 1, 3) and a saw terminal position (FIG. 4) in a saw guard, such as a saw box 62.
- a saw-guide bar 64 which for cutting, e.g. , a tree trunk 82 is constructed so as to be swung out and in between a rest position (FIGS. 1, 3) and a saw terminal position (FIG. 4) in a saw guard, such as a saw box 62.
- the saw-guide bar 64 may be covered in its rest posi ⁇ tion by a cover means having the form of a spring- steel blade 62', adjacent the contours of which there is provided one or more support or abutment devices 63 which face towards the shearing element.
- the abutment devices 63 are formed integrally with the steel blade 62' in the form of angled flaps, although they may also extend in the form of a single rim along the rear and outer side (not shown) of the blade 62'.
- the undersurfaces of the abutment devices 63 are spaced from the upper side of the shearing element 42, so that when the upper side of the steel blade 62' is subjected to blows and impacts, it will perform a resilient or damping move ⁇ ment before the abutment devices 63 strike the upper surface of the shearing element 42, and therewith prevent the blade 62' from coming into contact with the saw-guide bar 64 and the saw chain (not shown) .
- the guide bar attachment 66 of the guide bar 64 is pivotally mounted on the underside of an opposing wood-catching plate 24', which is larger than the wood-capture plate 24 and to which the aforedescribed cover means 62' is attached.
- the saw chain (not shown) of the saw-guide bar 64 is driven by a hydraulic motor 68 mounted on the upper side of the plate 24'. Pivotal movement of the saw-guide bar 64 between the rest position and the saw terminal position is effected by means of a setting device 70, e.g. a hydraulic piston- cylinder device, mounted between the guide bar attach ⁇ ment 66 and the plate 24'.
- a setting device 70 e.g. a hydraulic piston- cylinder device
- the tree can be held by the gripping arms (not shown) of the harvester during the root separating sawing action, and thereby be subjected to a force that acts towards the harvester without risk of the guide bar and saw chain being clamped between the cut surfaces during a cutting operation.
- the chain saw 60 with saw-guide bar 64 is protected by the underly ⁇ ing shearing element 42 against contact with the underlying support surface 80 and with stones and the like protruding from said surface.
- the frame part 44 of said shearing element 42 may alternatively extend in the form of the sector of a circle 44', so that the saw-guide bar 64 will be protected even in the shearing terminal position.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Forests & Forestry (AREA)
- Environmental Sciences (AREA)
- Shovels (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU45938/93A AU4593893A (en) | 1993-06-30 | 1993-06-30 | Wood harvester |
CA002166085A CA2166085C (en) | 1993-06-30 | 1993-06-30 | Wood harvester |
PCT/SE1993/000601 WO1995001094A1 (en) | 1993-06-30 | 1993-06-30 | Wood harvester |
BR9307868A BR9307868A (en) | 1993-06-30 | 1993-06-30 | Timber harvester |
PL93312324A PL171732B1 (en) | 1993-06-30 | 1993-06-30 | Trees trimming apparatus |
SE9504672A SE510340C2 (en) | 1993-06-30 | 1995-12-28 | Wood harvester with shear and saw cutter |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/SE1993/000601 WO1995001094A1 (en) | 1993-06-30 | 1993-06-30 | Wood harvester |
BR9307868A BR9307868A (en) | 1993-06-30 | 1993-06-30 | Timber harvester |
PL93312324A PL171732B1 (en) | 1993-06-30 | 1993-06-30 | Trees trimming apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995001094A1 true WO1995001094A1 (en) | 1995-01-12 |
Family
ID=27160088
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1993/000601 WO1995001094A1 (en) | 1993-06-30 | 1993-06-30 | Wood harvester |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU4593893A (en) |
BR (1) | BR9307868A (en) |
WO (1) | WO1995001094A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5954105A (en) * | 1996-05-24 | 1999-09-21 | Smith; Dennis William | Workhead for timber processing |
EP2106692A1 (en) | 2008-04-01 | 2009-10-07 | Moisio Forest OY | Timber cutting device and timber harvester utilizing the device |
US8931527B2 (en) | 2010-08-14 | 2015-01-13 | Metallitech Inc. | Tree processing head |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3610301A (en) * | 1970-04-15 | 1971-10-05 | Harrington Mfg Co | Tree-felling device |
US3726326A (en) * | 1971-12-06 | 1973-04-10 | T Coleman | Tree felling machine |
US3796242A (en) * | 1971-12-20 | 1974-03-12 | A Albright | Tree cutting and handling apparatus |
US3976111A (en) * | 1974-10-31 | 1976-08-24 | Cranab Aktiebolag | Tree-cutting device for lumbering machine |
US4116250A (en) * | 1975-10-07 | 1978-09-26 | Umea Mekaniska Ab | Tree felling unit |
US4221245A (en) * | 1979-01-19 | 1980-09-09 | Koehring Canada Limited | Tree harvester with saw and shear |
-
1993
- 1993-06-30 AU AU45938/93A patent/AU4593893A/en not_active Abandoned
- 1993-06-30 BR BR9307868A patent/BR9307868A/en not_active IP Right Cessation
- 1993-06-30 WO PCT/SE1993/000601 patent/WO1995001094A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3610301A (en) * | 1970-04-15 | 1971-10-05 | Harrington Mfg Co | Tree-felling device |
US3726326A (en) * | 1971-12-06 | 1973-04-10 | T Coleman | Tree felling machine |
US3796242A (en) * | 1971-12-20 | 1974-03-12 | A Albright | Tree cutting and handling apparatus |
US3976111A (en) * | 1974-10-31 | 1976-08-24 | Cranab Aktiebolag | Tree-cutting device for lumbering machine |
US4116250A (en) * | 1975-10-07 | 1978-09-26 | Umea Mekaniska Ab | Tree felling unit |
US4221245A (en) * | 1979-01-19 | 1980-09-09 | Koehring Canada Limited | Tree harvester with saw and shear |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5954105A (en) * | 1996-05-24 | 1999-09-21 | Smith; Dennis William | Workhead for timber processing |
EP2106692A1 (en) | 2008-04-01 | 2009-10-07 | Moisio Forest OY | Timber cutting device and timber harvester utilizing the device |
DE202009017940U1 (en) | 2008-04-01 | 2010-09-23 | Moisio Forest Oy | Wood cutter and device using harvester |
US8931527B2 (en) | 2010-08-14 | 2015-01-13 | Metallitech Inc. | Tree processing head |
Also Published As
Publication number | Publication date |
---|---|
BR9307868A (en) | 1996-07-30 |
AU4593893A (en) | 1995-01-24 |
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