WO2021204340A1 - Energy wood grapples - Google Patents

Energy wood grapples Download PDF

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Publication number
WO2021204340A1
WO2021204340A1 PCT/EE2021/000001 EE2021000001W WO2021204340A1 WO 2021204340 A1 WO2021204340 A1 WO 2021204340A1 EE 2021000001 W EE2021000001 W EE 2021000001W WO 2021204340 A1 WO2021204340 A1 WO 2021204340A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
ceiling
claws
reaction rod
operating cylinder
Prior art date
Application number
PCT/EE2021/000001
Other languages
French (fr)
Inventor
Joel Kõiv
Original Assignee
Estrus Steel OÜ
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 Estrus Steel OÜ filed Critical Estrus Steel OÜ
Publication of WO2021204340A1 publication Critical patent/WO2021204340A1/en

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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
    • A01G23/083—Feller-delimbers
    • 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
    • A01G23/087—Shearing apparatus or the like specially adapted for felling trees

Definitions

  • the energy wood grapples belong to the area of forestry and agricultural machinery construction, and they are used in landscape care for maintenance of forests, parks, meadows and ditch borders.
  • the energy wood grapples are designed for cutting shrubbery, bushes and trees with diameter of up to 30 cm.
  • Energy wood grapples are mainly used as a working element of mobile machinery like tracked and wheeled excavator, and they are designed to be attached to the beam of a tracked or wheeled excavator, as well as forestry limber cranes.
  • the working elements of energy wood grapples are a housing with claws that grab shrubs or wood, and a blade against which the wood is pressed by the claws, and as a result of pressing, the wood is mechanically cut.
  • the task of the present invention is to create a cutting device, i.e. energy wood grapples, which eliminate the «drawbacks of the known solutions, while being reliable, simple and compact.
  • energy wood grapples comprising at least one housing with a bottom, ceiling and rear wall, a cutting blade rigidly attached to the housing and a attachment assembly for connecting the wood grapples to mobile machinery, claws movably attached to the housing and at least one operating cylinder controlling the movement of the claws, and a reaction rod connecting the claws in order to ensure synchronised movement with the operating cylinder.
  • the housing with its bottom, ceiling and rear ⁇ wall is made from one bent metal sheet and contains reinforcing ribs and a vertical counter-cutting support reaching the cutting blade rigidly attached to the ceiling of the housing, the reaction rod comprises a top profile and a bottom profile and the front wall connecting those, whereas the operating cylinder is surrounded with the bottom, ceiling and rear wall of the housing and the top profile, bottom profile and front wall of the reaction rod, and the reaction rod in turn is surrounded with the bottom, ceiling and counter support of the housing.
  • the top part of the counter support has been welded to the front edge of the ceiling of the housing and the bottom part to the reinforcing rib of the bottom of the housing.
  • the operating cylinder is preferably a hydraulic cylinder.
  • the housing with movable claws attached by inserts and fingers and the rigidly attached cutting blade and attachment assembly for fixing the energy wood grapples to the beam of mobile machi nery is bent from one sheet, so that the bottom, rear wall and ceiling of the housing is formed by a profile bent from one sheet.
  • the housing profile bent front one sheetwith its welded reinforcing ribs gives rigidity to the device, reducing twisting and deflection of the housing,
  • the counter support created as a right-angled vertical plate increases the rigidity of the housing and prevents the entry of the cut material into the housing.
  • the rigid housing reduces the wearing of the above inserts and fingers, as the load on the above positions is more even, which in turn considerably increases the reliability of the energy wood grapples, as well as their service life.
  • the reaction rod interconnecting the two claws for them to move in synchronised manner has been created tall enough so that it would completely shelter the operating cylinder in order to prevent mechanical damages, i.e. the operating cylinder is completely hidden behind the reaction rod that operates as cylinder protection.
  • the solution remarkably increases the reliability of the energy wood grapples in order to prevent mechanical damaging of the cylinder.
  • a kind of box is formed around the hydraulic cylinder by parts of the housing and the reaction rod, with the aim to protect the hydraulic cylinder from accidental mechanical damages.
  • Fig 1 shows a perspective view of the operating principle of the energy wood grapples, grabbing a tree trunk between the claws.
  • Fig 2 show's a perspective view of the operating principle of the energy wood grapples, cutting a tree trunk.
  • Fig 3 shows top view of the energy wood grapples. The figure shows that She operating cylinder is sheltered behind the reaction rod, protected from accidental damages.
  • Fig 4 shows the front view of the energy wood grapples where it can be seen that the operating cylinder is sheltered behind the reaction rod, protected from accidental damages.
  • Fi g 5 shows a side view of the housing bent from one sheet.
  • Fig 6 showss a perspective view of the housing bent from one sheet.
  • Fig 7 shows a perspective view of the reaction rod with all the parts of the structure
  • the energy wood grapples are attached to the beam of a wheeled or tracked excavator or to the attachment of other mobile machinery ⁇ ’.
  • the energy wood grapples comprise a housing 1 bent from one sheet, so that the bottom 2, rear wall 3 and the ceiling 4 of the housing 1 are formed of profile bent from one sheet of metal.
  • Cutting blade 5, claws 6 and attachment assembly 7 have been fixed to the housing I for attachment of the energy wood grapples to the excavator.
  • Cutting blade 5 is attached to the socket (not shown) between the bottom 2 and counter support 19 of the housing, which prevents the cutting blade 5 from moving to any direction.
  • Cutting blade 5 is fixed to the housing 1 by bolts (not shown).
  • the counter support 19 is welded from above to the ceiling 4 of the housing, and is attached to the bottom 2 of the housing from below by welding it to the reinforcing rib 8, so that the cutting blade 5 fits precisely between the counter support and the botom 2 of the housing.
  • the attachment assembly 7 is welded to the housing.
  • the claws 6 are attached to the housing 1 by inserts and shafts (not shown).
  • the rigid housing 1 reduces the wearing of the above inserts and shafts, as the load on the above positions is more even, which in turn considerably increases the reliability of the energy wood grapples, as well as their service life.
  • the claws 6 are moved by an operating cylinder 9 through the reaction rod 10.
  • the reaction rod 10 interconnects the pair of claws 6 for them to move in synchronised manner.
  • the reaction rod 10 consists of the top profile 11 and the bottom profile 12 and the front wall 13 connecting those, which together with the parts of the housing 1 forms a protective structure around the operating cylinder 9.
  • the reaction rod 10 is connected to the right claw 6 by the right insert 14 and shaft 15, and with the left branch 6 by the left inserts 16.
  • the reaction rod 10 has been created tall enough to completely shelter the operating cylinder 9 from mechanical damages, i.e. the operating cylinder 9 is completely hidden behind the reaction rod 10.
  • a hook-shaped assembly 17 may be attached to the attachment assembly 7 or the housing 1, with the main purpose to remove stumps or other obstacles.
  • the hook-shaped assembly 17 is also very effective in wood or shrubbery for moving the excavator back and forth to the side or when the excavator is stuck in the soil.
  • a tree trunk is marked with position number 18.
  • the energy wood grapples operate as follows. The operating principle of the energy wood grapples (see fig 1 and fig 2) is that a tree trunk 18 is caught between the open claws 6 and the cutting blade 5.
  • reaction rod 11 top profile of reaction rod

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Forests & Forestry (AREA)
  • Environmental Sciences (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)

Abstract

The invention discusses energy wood grapples comprising at least one housing (1) with a bottom (2), ceiling (4) and rear wall (3), a cutting blade (5) rigidly attached to the housing and a attachment assembly (7) for connecting the energy wood grapples to mobile machinery, claws (6) movably attached to the housing (1) and at least one operating cylinder (9) controlling the movement of the claws (6), and a reaction rod (10) connecting the claws (6) in order to ensure synchronised movement with the operating cylinder (9), What is novel is that the housing with its bottom, ceiling and rear wall is made from one bent metal sheet and contains reinforcing ribs (8) and a vertical counter-cutting support (19) reaching the cutting blade (5) rigidly attached to the ceiling (4) of the housing (1), the reaction rod (10) comprises a top profile (11) and a bottom profile (12) and the front wall connecting those. Thus, the operating cylinder (9) is surrounded with the bottom, ceiling and rear wall of the housing (1) and the top profile (11), bottom profile (12) and front wall (13) of the reaction rod (10), whereas the reaction rod in turn is surrounded with the bottom, ceiling and counter support (19) of the housing (1).

Description

ENERGY WOOD GRAPPLES
Technical field
The energy wood grapples belong to the area of forestry and agricultural machinery construction, and they are used in landscape care for maintenance of forests, parks, meadows and ditch borders. The energy wood grapples are designed for cutting shrubbery, bushes and trees with diameter of up to 30 cm.
Prior Art
Energy wood grapples are mainly used as a working element of mobile machinery like tracked and wheeled excavator, and they are designed to be attached to the beam of a tracked or wheeled excavator, as well as forestry limber cranes.
The working elements of energy wood grapples are a housing with claws that grab shrubs or wood, and a blade against which the wood is pressed by the claws, and as a result of pressing, the wood is mechanically cut.
Document US 944555, T, J. Holden, 1909 describes a cutting device comprising cutting blades and a piston-cylinder mechanism operated with steam or compressed air pivotally connected to those. Compressed air causes the piston to take the cutting blades into the cutting position and a spring causes the piston to take the cutting blades to open position. The device is designed for cutting glass.
Document US 2214334, J, K. Knight Jr. 1940 describes a tree and brush cutter comprising a pair of blades attached to a tractor by frame and with articulated connection to one another, which is held in open position by a spring. When the articulated joint connecting the cutting blades is pressed against the tree to be cut, the momentum of the tractor is used to press the cutting blades together and cut the tree. Even though the design of the cutter is simple and does not comprise an operating cylinder, a tracked tractor with a powerful engine is required for work. Moreover, the cutter is slow as it requires a lot of maneuvering.
Document US 2366909, C. J. Johnson, 1945. describes pruning shears with a pole, with a shear assembly fitted at the upper end of the pole and a drive with pneumatic or hydraulic cylinder at the lower end. The device is designed for cutting tree branches and the power of the drive unit is low.
Document US 2565252, C. McFaull, 1952 describes a tree and brush cutter comprising a pair of blades attached to a tractor by frame and movably connected to one another. The cutting blades are operable and vertically movable by different piston-cylinder mechanisms. The cutter is clumsy and slow.
Document US 4168729, Wayne R. Tausig, 1979 describes a device comprising a housing, a pair of cutting blades, hydraulic cylinders for operating the cutting blades and gripping elements attached to the cutting blades. The device is designed for underwater pile cutting. Even though the cutting blades have gripping spikes preventing slipping of the work to be severed, the hydraulic cylinders are unprotected from mechanical damages.
Document FR 2397786 Al, Patrick Crawford, 1979 describes a cross cut shear for trees comprising first and second cooperating blades, a hydraulic cy linder for moving of cutting blades and means for fixing the work to be severed. A drawback of the shear for trees is the complicated design.
Document EP 2106692 A1 , Moisio Forest Oy, 2009 describes a timber cutting device for a timber harvester comprising guillotine blades rotatable by operating cylinders attached to the frame. The blades comprise at least one tooth to prevent the tree from escaping between the guillotine blades, whereas both guillotine blades have two blade portions at an angle to each other, this angle thus forming the said tooth to prevent the tree from escaping between the guillotine blades while cutting. The design is simple but is not complex, as there are no claws for gripping and holding a shrub or tree trunk. Also, the diameter of the tree trunk to be severed is limited to the distance between the cutting blades at their initial position.
The technical solution closest to the present invention is described in document EP 1737289 B1, Ponsse Qyj, A01G 23/081, 2016 - it is a device for wood processing comprising a housing, a cutting blade, claws and an operating cylinder controlling the movement of the claws. The device is designed for bunching of shrubbery and thinner trees between the claws in order to cut them simultaneously. The device is bulky and complicated. The operating cylinder is not protected from mechanical injuries and the cutting blade has separate housings. All that reduces the reliability of the device. Nature of the in vention
The task of the present invention is to create a cutting device, i.e. energy wood grapples, which eliminate the «drawbacks of the known solutions, while being reliable, simple and compact.
The task has been solved by energy wood grapples comprising at least one housing with a bottom, ceiling and rear wall, a cutting blade rigidly attached to the housing and a attachment assembly for connecting the wood grapples to mobile machinery, claws movably attached to the housing and at least one operating cylinder controlling the movement of the claws, and a reaction rod connecting the claws in order to ensure synchronised movement with the operating cylinder. The housing with its bottom, ceiling and rear· wall is made from one bent metal sheet and contains reinforcing ribs and a vertical counter-cutting support reaching the cutting blade rigidly attached to the ceiling of the housing, the reaction rod comprises a top profile and a bottom profile and the front wall connecting those, whereas the operating cylinder is surrounded with the bottom, ceiling and rear wall of the housing and the top profile, bottom profile and front wall of the reaction rod, and the reaction rod in turn is surrounded with the bottom, ceiling and counter support of the housing.
According to the second aspect of the invention, the top part of the counter support has been welded to the front edge of the ceiling of the housing and the bottom part to the reinforcing rib of the bottom of the housing.
The operating cylinder is preferably a hydraulic cylinder.
The housing with movable claws attached by inserts and fingers and the rigidly attached cutting blade and attachment assembly for fixing the energy wood grapples to the beam of mobile machi nery is bent from one sheet, so that the bottom, rear wall and ceiling of the housing is formed by a profile bent from one sheet. The housing profile bent front one sheetwith its welded reinforcing ribs gives rigidity to the device, reducing twisting and deflection of the housing, The counter support created as a right-angled vertical plate increases the rigidity of the housing and prevents the entry of the cut material into the housing. The rigid housing reduces the wearing of the above inserts and fingers, as the load on the above positions is more even, which in turn considerably increases the reliability of the energy wood grapples, as well as their service life.
The reaction rod interconnecting the two claws for them to move in synchronised manner has been created tall enough so that it would completely shelter the operating cylinder in order to prevent mechanical damages, i.e. the operating cylinder is completely hidden behind the reaction rod that operates as cylinder protection. The solution remarkably increases the reliability of the energy wood grapples in order to prevent mechanical damaging of the cylinder.
According to the invention, a kind of box is formed around the hydraulic cylinder by parts of the housing and the reaction rod, with the aim to protect the hydraulic cylinder from accidental mechanical damages.
List of drawings
The present invention is described by drawings attached to the implementation example.
Fig 1 shows a perspective view of the operating principle of the energy wood grapples, grabbing a tree trunk between the claws.
Fig 2 show's a perspective view of the operating principle of the energy wood grapples, cutting a tree trunk.
Fig 3 shows top view of the energy wood grapples. The figure shows that She operating cylinder is sheltered behind the reaction rod, protected from accidental damages. Fig 4 shows the front view of the energy wood grapples where it can be seen that the operating cylinder is sheltered behind the reaction rod, protected from accidental damages.
Fi g 5 shows a side view of the housing bent from one sheet.
Fig 6 showss a perspective view of the housing bent from one sheet.
Fig 7 shows a perspective view of the reaction rod with all the parts of the structure, Example of implementation
The energy wood grapples are attached to the beam of a wheeled or tracked excavator or to the attachment of other mobile machinery·’. The energy wood grapples comprise a housing 1 bent from one sheet, so that the bottom 2, rear wall 3 and the ceiling 4 of the housing 1 are formed of profile bent from one sheet of metal. Cutting blade 5, claws 6 and attachment assembly 7 have been fixed to the housing I for attachment of the energy wood grapples to the excavator. Cutting blade 5 is attached to the socket (not shown) between the bottom 2 and counter support 19 of the housing, which prevents the cutting blade 5 from moving to any direction. Cutting blade 5 is fixed to the housing 1 by bolts (not shown). The counter support 19 is welded from above to the ceiling 4 of the housing, and is attached to the bottom 2 of the housing from below by welding it to the reinforcing rib 8, so that the cutting blade 5 fits precisely between the counter support and the botom 2 of the housing. The housing 1 bent from one sheet with its welded reinforcing ribs 8 and counter support 19 gives rigidity to the device, reducing twisting and deflection of the housing 1. The attachment assembly 7 is welded to the housing. The claws 6 are attached to the housing 1 by inserts and shafts (not shown). The rigid housing 1 reduces the wearing of the above inserts and shafts, as the load on the above positions is more even, which in turn considerably increases the reliability of the energy wood grapples, as well as their service life.
The claws 6 are moved by an operating cylinder 9 through the reaction rod 10. The reaction rod 10 interconnects the pair of claws 6 for them to move in synchronised manner. The reaction rod 10 consists of the top profile 11 and the bottom profile 12 and the front wall 13 connecting those, which together with the parts of the housing 1 forms a protective structure around the operating cylinder 9. The reaction rod 10 is connected to the right claw 6 by the right insert 14 and shaft 15, and with the left branch 6 by the left inserts 16.
The reaction rod 10 has been created tall enough to completely shelter the operating cylinder 9 from mechanical damages, i.e. the operating cylinder 9 is completely hidden behind the reaction rod 10. A hook-shaped assembly 17 may be attached to the attachment assembly 7 or the housing 1, with the main purpose to remove stumps or other obstacles. The hook-shaped assembly 17 is also very effective in wood or shrubbery for moving the excavator back and forth to the side or when the excavator is stuck in the soil. A tree trunk is marked with position number 18. The energy wood grapples operate as follows. The operating principle of the energy wood grapples (see fig 1 and fig 2) is that a tree trunk 18 is caught between the open claws 6 and the cutting blade 5. To the piston side of the operating cylinder 9 will receive operating pressure causing the claws 6 to move towards each other in synchronised manner. Synchronised movement of the claws 6 is ensured by the operating cylinder 9 with the reaction rod 10. The synchronised movement of the claws
6 takes place by the principle of scissors. If during pressing of a tree trunk 18 against the cutting blade 5 the force transferred from the operating cylinder 9 to the claws 6 exceeds the resistance of the material of tree trunk 18, wood is cut.
List of position numbers 1 housing
2 bottom of housing
3 rear wall of housing
4 ceil ing of housing
5 cutting blade 6 claws
7 attachment assembly for attaching the energy wood grapples to excavator
8 reinforcing rib of the housing
9 operating cylinder
10 reaction rod 11 top profile of reaction rod
12 bottom profile of reaction rod
13 front wall of reaction rod
14 right insert
15 shaft 16 left inserts
17 hook-shaped assembly for removal of obstacles
18 tree trunk
19 vertical counter-cutting support

Claims

1. Energy wood grapples comprising at least one housing (1) with a bottom, ceiling and rear wall a cutting blade (5) and a attachment assembly (7) rigidly attached to the housing (1) for attachment of the wood grapples to mobile machinery, claws (6) attached movably to the housing (1) and at least one operating cylinder (9) controlling the movement of the claws, and a reaction rod (10) connecting the claws (6) in order to ensure synchronised movement with the operating cylinder (9), which is different because the housing (1 ) with its botom (2), ceiling (4) and rear wall (3) is made from one bent metal sheet and contains reinforcing ribs (8) and a vertical counter-cutting support (19) reaching the cutting blade (5) rigidly attached to the ceiling (4) of the housing, the reaction rod (10) comprises a top profile (11) and a bottom profile (12) and the front wall (13) connecting those, whereas the operating cylinder (9) is surrounded with the bottom (2), ceiling (4) and rear wall (3) of the housing and the top profile (1.1), bottom profile (12) and front wall (13) of the reaction rod (10), and the reaction rod (10) in turn is surrounded with the bottom (2), ceiling (4) and counter support (19) of the housing,
2. Energy wood grapples according to the demand clause 1, which are different because the counter support (19) has been welded to the ceiling (4) of the bousing and the bottom part to the reinforcing rib (8) of the bottom (2) of the housing.
3. Energy wood grapples according to the demand clause 1, which are different because the operating cylinder (9) is a hydraulic cylinder.
PCT/EE2021/000001 2020-04-09 2021-02-15 Energy wood grapples WO2021204340A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EEU202000010U EE01538U1 (en) 2020-04-09 2020-04-09 Energy wood grapples
EEU202000010 2020-04-09

Publications (1)

Publication Number Publication Date
WO2021204340A1 true WO2021204340A1 (en) 2021-10-14

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ID=76807270

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PCT/EE2021/000001 WO2021204340A1 (en) 2020-04-09 2021-02-15 Energy wood grapples

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WO (1) WO2021204340A1 (en)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US944555A (en) 1908-10-14 1909-12-28 Thomas J Holden Shearing device.
US2214334A (en) 1937-03-30 1940-09-10 Jr James K Knight Tree and brush cutter
US2366909A (en) 1943-06-29 1945-01-09 Charles J Johnson Power actuated pruning shears
US2565252A (en) 1945-11-23 1951-08-21 Mcfaull Clarence Power actuated shearing tree and brush cutter
FR2397786A1 (en) 1977-07-18 1979-02-16 Crawford Patrick Cross cut shear for trees - has two blades, each with straight cutting edge section, ending in convex arcuate section
US4168729A (en) 1977-11-16 1979-09-25 The United States Of America As Represented By The Secretary Of The Navy Underwater self-gripping pile cutting device
EP2106692A1 (en) 2008-04-01 2009-10-07 Moisio Forest OY Timber cutting device and timber harvester utilizing the device
WO2010042037A1 (en) * 2008-10-09 2010-04-15 Hultdin System Ab Gripping device
CA2773631A1 (en) * 2012-04-10 2013-10-10 Jacek Kuczynski Modular, versatile smartcut felling head
EP1737289B1 (en) 2004-04-16 2016-04-13 Ponsse Oyj Arrangement in wood handling device
US20180220599A1 (en) * 2017-02-08 2018-08-09 Douglas Bruce Kitchen Vegetation cutting and clearing system and method
EP3586608A1 (en) * 2018-06-26 2020-01-01 Jak-Metalli OY Group accumulator for energy wood grapple and energy wood grapple

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2942589C (en) * 2014-03-14 2022-06-28 Tenho KOPONEN Energy wood grapple and an accessory for an energy wood grapple

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US944555A (en) 1908-10-14 1909-12-28 Thomas J Holden Shearing device.
US2214334A (en) 1937-03-30 1940-09-10 Jr James K Knight Tree and brush cutter
US2366909A (en) 1943-06-29 1945-01-09 Charles J Johnson Power actuated pruning shears
US2565252A (en) 1945-11-23 1951-08-21 Mcfaull Clarence Power actuated shearing tree and brush cutter
FR2397786A1 (en) 1977-07-18 1979-02-16 Crawford Patrick Cross cut shear for trees - has two blades, each with straight cutting edge section, ending in convex arcuate section
US4168729A (en) 1977-11-16 1979-09-25 The United States Of America As Represented By The Secretary Of The Navy Underwater self-gripping pile cutting device
EP1737289B1 (en) 2004-04-16 2016-04-13 Ponsse Oyj Arrangement in wood handling device
EP2106692A1 (en) 2008-04-01 2009-10-07 Moisio Forest OY Timber cutting device and timber harvester utilizing the device
WO2010042037A1 (en) * 2008-10-09 2010-04-15 Hultdin System Ab Gripping device
CA2773631A1 (en) * 2012-04-10 2013-10-10 Jacek Kuczynski Modular, versatile smartcut felling head
US20180220599A1 (en) * 2017-02-08 2018-08-09 Douglas Bruce Kitchen Vegetation cutting and clearing system and method
EP3586608A1 (en) * 2018-06-26 2020-01-01 Jak-Metalli OY Group accumulator for energy wood grapple and energy wood grapple

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