EP4385692A1 - Barre de guidage pour chaîne de scie - Google Patents

Barre de guidage pour chaîne de scie Download PDF

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Publication number
EP4385692A1
EP4385692A1 EP22213659.0A EP22213659A EP4385692A1 EP 4385692 A1 EP4385692 A1 EP 4385692A1 EP 22213659 A EP22213659 A EP 22213659A EP 4385692 A1 EP4385692 A1 EP 4385692A1
Authority
EP
European Patent Office
Prior art keywords
guide bar
spray
bar body
feed channel
liquid feed
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP22213659.0A
Other languages
German (de)
English (en)
Inventor
Bo Axelsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Iggesund Forest AB
Original Assignee
Iggesund Forest AB
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 Iggesund Forest AB filed Critical Iggesund Forest AB
Priority to EP22213659.0A priority Critical patent/EP4385692A1/fr
Priority to PCT/EP2023/079274 priority patent/WO2024125864A1/fr
Publication of EP4385692A1 publication Critical patent/EP4385692A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B17/00—Chain saws; Equipment therefor
    • B27B17/02—Chain saws equipped with guide bar
    • B27B17/025—Composite guide bars, e.g. laminated, multisectioned; Guide bars of diverse material

Definitions

  • the present invention relates to a saw chain guide bar according to the preamble of claim 1, which is configured for attachment to a chainsaw cutting device of a tree harvester and which is intended to be used for spraying a liquid onto an exposed end surface of a tree stump that remains after the felling of a tree.
  • a tree stump remaining after the felling of a tree may by infected by fungus spores through the air and the resulting fungus growth may cause root rot, which may be transmitted from the infected tree stump to healthy and growing trees in the surroundings via the root system.
  • the cut surface of the tree stump may be coated with a suitable treatment liquid in connection with the felling of the tree by means of a tree harvester.
  • the treatment liquid may for instance be a chemical fungicide, such as an urea solution, or a water suspension of spores of harmless fungi which are antagonists or competitors to the harmful fungi.
  • Such a guide bar may for instance be of the type previously known from US 6 397 452 B1 or WO 01/87050 A1 where a liquid feed channel is provided along a part of the guide bar, wherein spray outlet orifices are distributed along the length of the liquid feed channel and a source of treatment liquid is connected to the liquid feed channel in order to supply pressurized treatment liquid into the liquid feed channel and allow the treatment liquid to be emitted through the spray outlet orifices as an array of liquid sprays directed towards the cut surface of a tree stump.
  • the pressure of the treatment liquid drops as the treatment liquid moves through the liquid feed channel and passes the different spray outlet orifices, which may cause an uneven distribution of the treatment liquid over the cut surface of the tree stump.
  • the exposed cut surface of the tree stump is covered completely and evenly with the treatment liquid. It is also desirable to avoid a spraying of the treatment liquid onto vegetation and ground in the area around the tree stump, to thereby avoid negative environmental effects and a costly waste of treatment liquid.
  • the distribution of the spray outlet orifices along the liquid feed channel has to be adapted to the diameter of the trees to be cut in order to achieve an appropriate spray pattern over the cut surface of the tree stumps.
  • a saw chain guide bar of this previously known type is adapted for cutting of large diameter trees, a considerable amount of the sprayed treatment liquid will miss the cut surface of a tree stump if the saw chain guide bar is also used for cutting a tree of smaller diameter. If a saw chain guide bar of this previously known type is adapted for cutting of small diameter trees, the sprayed treatment liquid will not cover the entire area of the cut surface of a tree stump if the saw chain guide bar is also used for cutting a tree of larger diameter.
  • the object of the present invention is to achieve a further development of a saw chain guide bar of the above-mentioned type so as to provide a saw chain guide bar that is improved in at least some aspect.
  • the saw chain guide bar of the present invention comprises:
  • the liquid feed channel At its upstream end, the liquid feed channel has an inlet opening, through which the liquid feed channel is configured to receive pressurized liquid. At its downstream end, the liquid feed channel has an outlet with at least one spray outlet orifice facing the rear end or the nose end of the guide bar body. This outlet and its spray outlet orifice are in the following referred to as “first outlet” and “first spray outlet orifice”, respectively.
  • the first outlet is in fluid communication with the inlet opening of the liquid feed channel and configured to emit liquid received therefrom as a liquid spray through the first spray outlet orifice in a direction towards the rear end of the guide bar body if the first spray outlet orifice is configured to face the rear end of the guide bar body or in a direction towards the nose end of the guide bar body if the first spray outlet orifice is configured to face the nose end of the guide bar body.
  • the guide bar body is provided with a spray guiding groove, in the following referred to as "first spray guiding groove", formed as an outwardly open elongated recess in the first side face of the guide bar body, wherein the first spray outlet orifice opens into the first spray guiding groove and the first spray guiding groove extends from said first outlet of the liquid feed channel in a direction towards the rear end of the guide bar body if the first spray outlet orifice is configured to face the rear end of the guide bar body or in a direction towards the nose end of the guide bar body if the first spray outlet orifice is configured to face the nose end of the guide bar body.
  • first spray guiding groove formed as an outwardly open elongated recess in the first side face of the guide bar body
  • the saw chain guide bar When liquid is to be applied from the above-mentioned liquid feed channel onto a cut surface of a tree stump, the saw chain guide bar is to be moved across the tree to be felled with the above-mentioned first side face of the guide bar body facing the cut surface of the tree stump.
  • the above-mentioned spray outlet orifice will emit a liquid spray in a direction along the guide bar body and the associated spray guiding groove will allow this liquid spray to be distributed along the guide bar body before hitting the cut surface of a tree stump.
  • Liquid from one single liquid spray may hereby be distributed over a larger area on a cut surface of a tree stump when the saw chain guide bar is swept over the surface.
  • the first outlet preferably has one single first spray outlet orifice and that the second outlet preferably has one single second spray outlet orifice. Furthermore, the first spray outlet orifice and the second spray outlet orifice are preferably aligned with each other.
  • the total cross-sectional area of all spray outlet orifices of the liquid feed channel is smaller than the cross-sectional area of the inlet opening of the liquid feed channel.
  • Pressure drop in the liquid feed channel is hereby avoided, which is favourable with respect to the formation of the liquid spray or sprays.
  • the liquid feed channel is provided with one single first outlet orifice and one single second outlet orifice, the sum of the cross-sectional area of the first spray outlet orifice and the cross-sectional area of the second spray outlet orifice is in this case smaller than the cross-sectional area of the inlet opening.
  • Each spray guiding groove preferably extends in a straight line, or at least essentially straight line, along a part of the first side face of the guide bar body. Furthermore, the first and second spray guiding grooves are preferably aligned with each other.
  • each spray guiding groove has an inclined bottom surface, which has such an inclination that the depth of the spray guiding groove is gradually decreasing as seen in a direction from a first end of the spray guiding groove facing the associated outlet of the liquid feed channel to an opposite second end of the spray guiding groove.
  • the liquid feed channel comprises:
  • the liquid feed channel is with advantage formed by an elongated tube, which is mounted in an elongated tube-accommodating groove in the first side face of the guide bar body.
  • a bottom surface of the tube-accommodating groove may have:
  • a saw chain guide bar 1 according to a first embodiment of the present invention is illustrated in Figs 1-6 .
  • the saw chain guide bar 1 is to be attached to a chainsaw cutting device of a tree harvester and is intended to co-operate with a saw chain of said cutting device.
  • the saw chain guide bar 1 comprises an plate-shaped and elongated guide bar body 2, which has a rear end 2b and an opposite nose end 2a. At its rear end 2b, the guide bar body 2 has an attachment section 3 configured for attachment of the saw chain guide bar 1 to a chainsaw cutting device of a tree harvester by clamping.
  • the attachment section 3 is in a conventional manner provided with a centre slot 4, which is configured to receive clamping bolts of the chainsaw cutting device.
  • the guide bar body 2 has a first side face 5a extending between the rear end 2b and the nose end 2a and an opposite second side face 5b extending between the rear end 2b and the nose end 2a.
  • a first saw chain guide track 6a extends along a first longitudinal edge 7a of the guide bar body 2 and a second saw chain guide track 6b extends along the opposite second longitudinal edge 7b of the guide bar body 2.
  • a sprocket wheel 8 is in a conventional manner rotatably mounted to the guide bar body 2 at the nose end 2a thereof.
  • a saw chain of the above-mentioned cutting device is to extend in a loop around the guide bar body 2 along the peripheral edge thereof while being in engagement with the sprocket wheel 8 and with the first and second saw chain guide tracks 6a, 6b.
  • the saw chain is rotated and thereby driven along the peripheral edge of the guide bar body 2 by means of a driving motor of the cutting device.
  • a liquid feed channel 10 extends along a part of the guide bar body 2 from the attachment section 3 towards the nose end 2a, the liquid feed channel 10 having an upstream end 10a located at the attachment section 3 and a downstream end 10b located at a distance from the attachment section 3.
  • the liquid feed channel 10 has an inlet opening 11, through which the liquid feed channel is configured to receive pressurized liquid.
  • the liquid is for instance an urea solution or any other desired tree stump treatment liquid and may be supplied to the liquid feed channel 10 from a liquid reservoir in the tree harvester by means of a pump.
  • the inlet of the liquid feed channel 10 comprises one single inlet opening 11, but the liquid feed channel 10 may as an alternative be provided with an inlet that comprises two or more inlet openings.
  • the liquid feed channel 10 has a first outlet 12a with a first spray outlet orifice 13a facing the nose end 2a of the guide bar body 2 and a second outlet 12b with a second spray outlet orifice 13b facing the rear end 2b of the guide bar body 2.
  • the first and second outlets 12a, 12b are located opposite to each other on opposite sides of the liquid feed channel 10 and are both in fluid communication with the inlet opening 11 in order to receive liquid that has entered the liquid feed channel 10 through the inlet opening 11.
  • the first spray outlet orifice 13a is configured to emit liquid from the liquid feed channel 10 as a liquid spray in a direction towards the nose end 2a of the guide bar body 2 and the second spray outlet orifice 13b is configured to emit liquid from the liquid feed channel 10 as a liquid spray in a direction towards the rear end 2b of the guide bar body 2.
  • the first and second spray outlet orifices 13a, 13b are with advantage aligned with each other.
  • the total cross-sectional area of the first and second spray outlet orifices 13a, 13b i.e. the sum of the cross-sectional area of the first spray outlet orifice 13a and the cross-sectional area of the second spray outlet orifice 13, is preferably smaller than the cross-sectional area of the inlet opening 11.
  • the guide bar body 2 comprises a first spray guiding groove 15a, which is formed as an outwardly open elongated recess in the first side face 5a of the guide bar body 2 and which extends from the first outlet 12a of the liquid feed channel 10 along a part of the first side face 5a in a direction towards the nose end 2a of the guide bar body 2.
  • the guide bar body 2 also comprises a second spray guiding groove 15b, which is formed as an outwardly open elongated recess in the first side face 5a of the guide bar body 2 and which extends from the second outlet 12b of the liquid feed channel 10 along a part of the first side face 5a in a direction towards the rear end 2b of the guide bar body 2.
  • the first spray outlet orifice 13a opens into the first spray guiding groove 15a and the first spray guiding groove is configured to receive the liquid spray emitted from the first spray outlet orifice 13a and allow this liquid spray to propagate along the length of the first spray guiding groove 15a in a direction towards the nose end 2a of the guide bar body 2.
  • the second spray outlet orifice 13b opens into the second spray guiding groove 15b and the second spray guiding groove is configured to receive the liquid spray emitted from the second spray outlet orifice 13b and allow this liquid spray to propagate along the length of the second spray guiding groove 15b in a direction towards the rear end 2b of the guide bar body 2.
  • each spray guiding groove 15a, 15b extends in a straight line, or at least essentially straight line, along a part of the first side face 5a of the guide bar body 2, wherein the first and second spray guiding grooves 15a, 15b are aligned with each other.
  • the first spray guiding groove 15a and/or the second spray guiding groove 15b may as an alternative be slightly curved as seen in the longitudinal direction of the guide bar body 2, as long as it allows the received liquid spray to propagate a certain distance in the longitudinal direction of the guide bar body 2.
  • Each one of the first and second spray guiding grooves 15a, 15b preferably has a length of 80-200 mm and a width of 6-10 mm.
  • each spray guiding groove 15a, 15b has an inclined bottom surface 16 (see Figs 1 and 8 ), which has such an inclination that the depth d of the spray guiding groove 15a, 15b is gradually decreasing as seen in a direction from a first end 17a of the spray guiding groove 15a, 15b facing the associated outlet 12a, 12b of the liquid feed channel 10 to an opposite second end 17b of the spray guiding groove 15a, 15b.
  • each spray guiding groove 15a, 15b may as an alternative have one and the same depth all along its length or a depth that varies in any other suitable manner along the length thereof.
  • the liquid feed channel 10 comprises:
  • the liquid feed channel 10 is formed by an elongated tube 19 (see Fig 7 ), which is mounted in an elongated tube-accommodating groove 20 (see Fig 8 ) in the first side face 5a of the guide bar body 2.
  • the tube 19 is with advantage mounted to the tube-accommodating groove 20 in the manner described in US 6 397 475 B1 , wherein the tube-accommodating groove 20 has undercut side walls 21, as illustrated in Fig 5 .
  • the tube 19 is made of soft and deformable metal material, such as aluminium or cupper, and is originally made with a circular cross-sectional shape.
  • the tube 19 is first bent in correspondence with the longitudinal shape of the tube-accommodating groove 20 and then positioned in this groove.
  • the tube 19 After having been inserted into the tube-accommodating groove 20, the tube 19 is deformed by rolling or pressing until it fills the tube-accommodating groove 20 and conforms to the undercut side walls 21 thereof.
  • the tube 19 is secured in the tube-accommodating groove 20 by having its cross-sectional shape deformed to conform to the undercut cross-sectional shape of the tube-accommodating groove.
  • a channel-forming tube may of course also be secured to an associated tube-accommodating groove 20 in the guide bar body 2 in any other suitable manner.
  • the liquid feed channel 10 may be formed as an integrated part of the guide bar body 2, for instance by being formed as an outwardly covered recess in the guide bar body 2.
  • the bottom surface 22 of the tube-accommodating groove 20 has:
  • the inlet opening 11 of the liquid feed channel 10 is facing the bottom surface 22 of the tube-accommodating groove 20, wherein the inlet opening 11 is aligned with and connected to a liquid supply hole 24 that extends through the guide bar body 2 between the second side face 5b and the tube-accommodating groove 20.
  • the liquid enters the inlet opening 11 of the liquid feed channel 10 from the second side face 5b of the guide bar body 2 through the liquid supply hole 24.
  • the inlet opening 11 of the liquid feed channel 10 may as an alternative be arranged on the outwardly facing side of the liquid feed channel 10, as illustrated in Fig 10 . In the latter case, the liquid enters the inlet opening 11 of the liquid feed channel 10 from the first side face 5a of the guide bar body 2.
  • the first outlet 12a of the liquid feed channel 10 comprises one single outlet orifice 13a, but the first outlet 12a may as an alternative be provided with two or more outlet orifices 13a facing the nose end 2a of the guide bar body 2.
  • the second outlet 12b of the liquid feed channel 10 comprises one single outlet orifice 13b, but the second outlet 12b may as an alternative be provided with two or more outlet orifices 13b facing the rear end 2b of the guide bar body 2.
  • the saw chain guide bar 1 has a liquid feed channel 10 with two opposite outlets 12a, 12b and two associated spray guiding grooves 15a, 15b.
  • the saw chain guide bar 1 may as an alternative have a liquid feed channel 10 with one single outlet comprising a spray outlet orifice facing the rear end 2b or the nose end 2a of the guide bar body 2 and one single spray guiding groove. If the spray outlet orifice of this single outlet faces the rear end 2b of the guide bar body 2, it is configured to emit liquid from the liquid feed channel 10 as a liquid spray in a direction towards the rear end 2b of the guide bar body 2, wherein the associated spray guiding groove extends from the outlet in a direction towards the rear end 2b of the guide bar body 2.
  • the spray outlet orifice of said single outlet faces the nose end 2a of the guide bar body 2, it is configured to emit liquid from the liquid feed channel 10 as a liquid spray in a direction towards the nose end 2a of the guide bar body 2, wherein the associated spray guiding groove extends from the outlet in a direction towards the nose end 2a of the guide bar body 2.
  • the saw chain guide bar 1 comprises a first liquid feed channel 10 of the type described above for emitting liquid sprays on the first side face 5a of the guide bar body 2 and an additional second liquid feed channel 10' of the same type for emitting liquid sprays on the opposite second side face 5b of the guide bar body 2.
  • first and second spray guiding grooves 15a, 15b are formed as outwardly open elongated recesses in the first side face 5a of the guide bar body 2 as described above with reference to Figs 1-6
  • corresponding third and fourth spray guiding grooves 15c, 15d are formed as outwardly open elongated recesses in the second side face 5b of the guide bar body 2.
  • the saw chain guide bar 1 illustrated in Figs 11-13 corresponds to the saw chain guide bar 1 described above with reference to Figs 1-6 .
  • the saw chain guide bar 2 preferably has 180° rotational symmetry about a longitudinal centre axis 25 of the guide bar body 2.
  • the first and second spray guiding grooves 15a, 15b are located on the first side face 5a of the guide bar body 2 adjacent to the first longitudinal edge 7a thereof, whereas the third and fourth spray guiding grooves 15c, 15d are located on the second side face 5b of the guide bar body 2 adjacent to the second longitudinal edge 7b thereof.
  • the guide bar body 2 has the form of a solid body.
  • the guide bar body 2 may as an alternative have the form of a laminated body formed by two or more separate plates.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Nozzles (AREA)
EP22213659.0A 2022-12-15 2022-12-15 Barre de guidage pour chaîne de scie Pending EP4385692A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22213659.0A EP4385692A1 (fr) 2022-12-15 2022-12-15 Barre de guidage pour chaîne de scie
PCT/EP2023/079274 WO2024125864A1 (fr) 2022-12-15 2023-10-20 Barre de guidage de chaîne coupante

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22213659.0A EP4385692A1 (fr) 2022-12-15 2022-12-15 Barre de guidage pour chaîne de scie

Publications (1)

Publication Number Publication Date
EP4385692A1 true EP4385692A1 (fr) 2024-06-19

Family

ID=84537000

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22213659.0A Pending EP4385692A1 (fr) 2022-12-15 2022-12-15 Barre de guidage pour chaîne de scie

Country Status (2)

Country Link
EP (1) EP4385692A1 (fr)
WO (1) WO2024125864A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001087050A1 (fr) 2000-05-15 2001-11-22 Rolf Gustafsson Dispositif de lame de scie pour lutte antifongique
US6397475B1 (en) 1999-10-28 2002-06-04 Blount, Inc. Chainsaw guide bar having liquid-conducting channels
US6397452B1 (en) 2001-05-30 2002-06-04 Blount, Inc. Guide bar including stump treatment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6397475B1 (en) 1999-10-28 2002-06-04 Blount, Inc. Chainsaw guide bar having liquid-conducting channels
WO2001087050A1 (fr) 2000-05-15 2001-11-22 Rolf Gustafsson Dispositif de lame de scie pour lutte antifongique
US6397452B1 (en) 2001-05-30 2002-06-04 Blount, Inc. Guide bar including stump treatment

Also Published As

Publication number Publication date
WO2024125864A1 (fr) 2024-06-20

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