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
  • B27B17/12—Lubricating devices specially designed for chain saws
• • 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 bar having a driven cutting chain which is located in grooves in edge portions of said saw bar, whereby the saw bar has at least two, preferably three, metal plates which are joi- ned together by means of one or more outer weld joints provided by laser welding and extending forward in the longitudinal direction of the saw bar towards a front end portion thereof, whereby the saw bar has a rear moun ⁇ ting portion through which said saw bar is adapted to be mounted on a drive assembly for driving said saw bar and whereby the saw bar is provided with a channel system for channeling at least a liquid, preferably lubricating oil, from the rear mounting portion and through a por ⁇ tion situated in front thereof and connecting thereto, in a forward direction towards the front end portion of the saw bar.
• the present invention also relates to a method for manufacturing such a saw bar.
• Saw bars of said type are already known from CA patent specification 1 198 967.
• the metal plates are joined by means of outer weld joints extending along the edge portions of the saw bar and provided by so called laser welding. This normally means that the metal alloy in the metal plates are remelted by concentrating the energy of the laser beam so that a homogeneous zone is defined.
• the object of the present invention has been to provide an optimum strong saw bar of the above ⁇ mentioned type, and this is arrived at according to the invention substantially by means of the characterizing features of claim 1.
• a simple method for manufacturing said saw bar is defined by the characterizing features of claim 16.
• the saw bar has at least an inner weld joint, provided by laser welding, in inner portions of said saw bar and beside the channel system, an optimum strong saw bar can be obtained at reasonable costs and simul ⁇ taneously, a liquid sealing for the channel system is defined.
• figure 1 is a plan view of a saw bar according to the invention
• figures 2-7 are sections II-VII through the saw bar of figure 1
• figure 8 is a plan view of a part of an al ⁇ ternatively designed saw bar according to the invention.
• the saw bar illustrated in the drawings is of so called laminated type, which means that it consists of a number of metal plates which engage each other and which are joined together, so that a sandwich structure is defined.
• the saw bar as illustrated consists of three metal plates 1, 2 and 3 which are joined toget ⁇ her and designed so that grooves 5 for a cutting chain (not shown) are provided along edge portions 4 thereof.
• the saw bar has a rear mounting portion 6 with a mounting groove 7 which extends from a rear edge portion 8 a substantial distance into said rear mounting portion 6.
• a sprocket (not shown) via which the cutting chain is intended to run.
• the saw bar includes a channel system 14 for chan ⁇ neling or guiding liquids to the cutting chain.
• the channel system 14 may consist of one or more channels for channeling lubricating oil and/or another liquid such as liquids containing paint and/or bacteria to the saw bar.
• the channel system 14 is provided in the intermediate metal plate 2 and it includes two inlet openings 15 and 16 in the rear mounting portion 6.
• Channel branches 17 and 18 respectively extend in a forward direction from said in ⁇ let openings 15, 16. These branches converge in portion 11 of the saw bar to a single channel 19 which extends centrally in the saw bar in a forward direction through the front portions 12 and near to the front end portion 13.
• the channel 19 branches off to e.g. three channel branches of which a forwardly directed channel branch 20 may extend to a space for the sprocket, while two laterally directed channel branches 21 and 22 open into the groove 5 for the cutting chain at opposite long sides thereof.
• Laser technique is used for joining the metal plates 1-3 while a laser assembly 23 is brought to direct its laser beam 24 towards the saw bar and by means of so cal ⁇ led laser welding with high energy remelt the metal alloy in the metal plates 1-3 and define homogeneous zones therebetween, namely preferably simultaneously between the metal plates 1 and 2 as between the metal plates 2 •and 3. It is also possible to laser weld two metal pla ⁇ tes at the time. With this laser technique a suitable weld joint pattern can be obtained by moving the saw bar in a suitable manner relative to the laser assembly or vice versa.
• inner weld joint 28 and/ /or 29 and/or 30 and/or 31 which preferably runs conti ⁇ nuously in a forward direction through said portion 11 (see particularly figs. 5 and 6) .
• This inner weld joint 28-31 is adapted to join together the metal plates 1-3 in the inner portions 27 of the portion 11 and thereby reinforce and stiffen at least said inner portions 27 of the saw bar.
• the inner or interior weld joint 28 and/or 29 and/or 30 and/or 31 can also define liquid sealings for the channel system 14 by extending continuously there- along or by being located in another suitable manner in relation thereto.
• the locations of the inner weld joints 28-31 in at least the portion 11 are adapted to the requirements set with regard to reinforcement of inner portions of the saw bar and also to the design of the channel system 14, whereby said inner weld joints preferably are located at a least distance of 0,5 mm and a largest distance of 5 mm from at least a part of the channels of the channel system 14. Furthermore, inner edge weld joints 36, 37 are preferably located at a least distance of 0,5 mm and a largest distance of 7 mm from the mounting groove 7 and/or the mounting holes 9, 10.
• the portion 11 there are provided in the portion 11 two pairs of inner weld joints 28, 30 and 29, 31 respectively. These are preferably lo- cated on opposite sides of the channel 19 and start pre ⁇ ferably in the rear mounting portion 6 and extend conti ⁇ nuously in forward direction through the portion 11 along said channel 19 to the front portions 12 and end therein.
• the inner weld joints 28-31 extend preferably recti- linearly or somewhat arcuately relative to each other along the saw bar.
• weld joints 28, 30 can be connec- ted with each other through a connecting weld joint 32 and the weld joints 29, 31 through a connecting weld joint 33.
• each weld joint 30, 31 runs forward in the front por- tions 12 of the saw bar, preferably substantially longer than the weld joints 28, 29, and each weld joint 30, 31 has at the front preferably an inwardly directed front portion 34, 35 which is facing or directed towards the channel 19 so that said channel can pass between said front portions 34, 35.
• the distances between the weld joints 28-31 may be substantially equal.
• each edge weld joint 36 and 37 respectively, which extend continuously along the long sides of the moun ⁇ ting groove 7 and which preferably are connected with each other through the bottom edge of said mounting groove via a bottom edge weld joint 38.
• Each edge weld joint 36 and 37 respectively connects with or joins such a portion of an outer weld joint 25 and 26 respectively, which runs along the rear edge portion 8.
• Each edge weld joint 36, 37 runs preferably between the mounting groove 7 and each mounting hole 9 and 10 respectively, provided on opposite sides thereof.
• each edge weld joint 36 and 37 respec ⁇ tively, is preferably provided so that it extends conti ⁇ nuously along the inner side of at least a part of each channel branch 17 and 18 respectively, while portions of the inner weld joints 28 and 29 respectively, extend continuously along at least parts of the outer side of each channel branch 17 and 18 respectively.
• each channel branch 17 and 18 respectively there may also extend a portion of an outer weld joint 25 and 26 respectively, and each connec- ting weld joint 32 and 33 respectively, may connect with said portion to define a continuous sealing along one side of each channel branch 17 and 18 respectively.
• each connec- ting weld joint 32 and 33 respectively may connect with said portion to define a continuous sealing along one side of each channel branch 17 and 18 respectively.
• the rear mounting portion 6 there may also be pro ⁇ vided inner, short weld joints 39 and 40 which connect with or join the edge weld joints 36, 37 and which extend along portions of the inside of said channel branches 17 and 18 respectively, and end at about each inlet opening 15 and 16 respectively, or eventually extend beyond said opening in backward/outward direction and connect with each outer weld joint 25 and 26 respectively.
• Two inner front weld joints 41 and 42 may be inclu- ded in the front portions 12 of the saw bar and said weld joints 41, 42 are preferably provided immediately behind the front end portion 13 , wherein the sprocket is adapted to be mounted.
• Each such weld joint 41, 42 preferably has an endless shape, e.g. substantially rectangular shape, and a portion of said weld joint 41 and 42 respectively, may extend along a front side of one of the laterally directed channel branches 21 and 22 respectively.
• the rear side of said channel branch 21 and 22 respec ⁇ tively, there may run an inwardly directed front portion 43 and 44 respectively, of each outer weld joint 25 and 26 respectively.
• the saw bar is manufactured so that the metal pla- tes 1, 2 and 3 are placed on top of each other, where ⁇ after they are joined together by providing the weld joints by means of the laser assembly 23, whereby one or more weld joints 28-31 are located at least in the inner portions 27 of part or portion 11 for extensive reinforce- ment thereof.
• the metal plates 1, 2, 3 may be heated to e.g. at least 150°C and 640°C at the most before or during the process of joining said plates together.
• inner weld joints may be provided in a totally different pattern than illu ⁇ strated in fig. 1.
• inner weld joints 28, 29 may extend in accordance with a sine curve (schematically illustrated with dashed and dotted lines) which extend back and forth from the inner portions 27 to near or adjacent the edge portions 4 and vice versa.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Sawing (AREA)
• Arc Welding In General (AREA)
• Detergent Compositions (AREA)
• Pressure Welding/Diffusion-Bonding (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20395569

Family Applications (1)

Country Status (6)

Cited By (1)

Citations (3)

• 1994
  • 1994-10-12 SE SE9403460A patent/SE509573C2/sv not_active IP Right Cessation
• 1995
  • 1995-10-11 WO PCT/SE1995/001169 patent/WO1996011779A1/en active Application Filing
  • 1995-10-11 JP JP8513150A patent/JPH10507416A/ja active Pending
  • 1995-10-11 AU AU37142/95A patent/AU3714295A/en not_active Abandoned
  • 1995-10-11 CA CA002200979A patent/CA2200979A1/en not_active Abandoned
• 1997
  • 1997-04-09 FI FI971474A patent/FI971474L/fi unknown

Patent Citations (3)

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