WO2016139569A1 - Conception de chaîne de tronçonneuse pour découpe et rabotage en deux étapes - Google Patents

Conception de chaîne de tronçonneuse pour découpe et rabotage en deux étapes Download PDF

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Publication number
WO2016139569A1
WO2016139569A1 PCT/IB2016/051113 IB2016051113W WO2016139569A1 WO 2016139569 A1 WO2016139569 A1 WO 2016139569A1 IB 2016051113 W IB2016051113 W IB 2016051113W WO 2016139569 A1 WO2016139569 A1 WO 2016139569A1
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WO
WIPO (PCT)
Prior art keywords
links
cutting
cutting chain
cutter
chain
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.)
Ceased
Application number
PCT/IB2016/051113
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English (en)
Inventor
Hasse Lilja
Niklas SARIUS
Hans-Åke SUNDBERG
Johan MILLENBERG
Jonatan GUNÉR
Adam STÅHLKRANTZ
Per CARLBÄCK
Richard Hall
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.)
Husqvarna AB
Original Assignee
Husqvarna 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 Husqvarna AB filed Critical Husqvarna AB
Publication of WO2016139569A1 publication Critical patent/WO2016139569A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B27B33/00—Sawing tools for saw mills, sawing machines, or sawing devices
    • B27B33/14—Saw chains
    • B27B33/142—Cutter elements

Definitions

  • Example embodiments generally relate to hand held power equipment and, more particularly, relate to cutting chain improvements for a chainsaw.
  • Chainsaws are commonly used in both commercial and private settings to cut timber or perform other rigorous cutting operations. Because chainsaws are typically employed in outdoor environments, and the work they are employed to perform often inherently generates debris, chainsaws are typically relatively robust hand held machines. They can be powered by gasoline engines or electric motors (e.g., via batteries or wired connections) to turn a chain around a guide bar at relatively high speeds.
  • the chain includes cutting teeth that engage lumber or another medium in order to cut the medium as the teeth are passed over a surface of the medium at high speed.
  • Some example embodiments may provide for a chainsaw chain constructed with a modification to cutter links to improve cutting efficiency.
  • the modification to the cutter links of the chain may improve cutting efficiency and reduce the energy required for executing the cutting procedure, and also minimize the effects of normal wear on cutting efficiency.
  • the modification which involves designing the cutter links to cut sides of a chip in a first step and then perform a planing action in a second step, may make the cutter links have cutting efficiencies that are increased. The cutter links may therefore have better performance over a longer useful life.
  • a cutting chain for a chainsaw may be provided.
  • the cutting chain may include a plurality of drive links, a plurality of side links operably coupled to respective ones of the drive links, a slicer element and a planing element.
  • the drive links extend in a first direction substantially parallel to sides of a guide bar about which the chain is rotatable.
  • the side links are operably coupled to respective ones of the drive links and are oriented to lie in planes substantially parallel to the first direction. At least some of the side links are cutter links.
  • the slicer element extends parallel to the first direction to cut a chip in media to be cut responsive to rotation of the chain.
  • the planing element is disposed after the slicing element in the chain and extends in a direction substantially perpendicular to the first direction to remove the chip cut by the slicer element.
  • the modification to the cutter links of the chain may improve cutting properties to make the chain cut more like a blade than a typical chain.
  • the modification which involves designing close fitting cutter links, tie straps, bumpers and drive links that minimize out of plane extension of components, may make the chain have cutting properties that are sharper for straight ahead cutting.
  • a cutting chain for a chainsaw may be provided.
  • the cutting chain may include a plurality of drive links and a plurality of side links.
  • the drive links extend in a first direction substantially parallel to sides of a guide bar about which the chain is rotatable.
  • the side links are operably coupled to respective ones of the drive links and are oriented to lie in planes substantially parallel to the first direction.
  • At least some of the side links include grinding elements and at least some others of the side links include bumpers.
  • the drive links include grinding elements disposed proximate to the grinding elements of the side links, and each pair of adjacent grinding elements is preceded by a bumper.
  • the modification to the cutter links of the chain may improve cutting efficiency and reduce the energy required for executing the cutting procedure, and also minimize the effects of normal wear on cutting efficiency.
  • the modification which involves designing the cutter links to be unsymmetrical relative to each other, but instead for each cutter link to cut on both sides, may improve cutter link efficiency.
  • the cutter links may therefore have better performance over a longer useful life.
  • a cutting chain for a chainsaw may be provided.
  • the cutting chain may include a plurality of drive links and a plurality of side links operably coupled to respective ones of the drive links via rivets that extend in a transverse direction. At least some of the side links include cutter links. At least one of the cutter links includes a base portion, a cutting portion and a depth gauge portion.
  • the cutting portion extends away from the base portion and includes a side plate and a top plate.
  • the top plate has a width in the transverse direction that is at least longer than a length of the rivets.
  • the depth gauge portion extends away from the base portion in the same direction as the cutting portion.
  • a cutting chain for a chainsaw may be provided.
  • the cutting chain may include a plurality of drive links and a plurality of cutter links operably coupled to respective ones of the drive links.
  • At least one of the cutter links may include a base portion, a cutting portion extending away from the base portion, and a depth gauge portion.
  • the cutting portion may include a side plate and a top plate.
  • the depth gauge portion may extend away from the base portion in the same direction as the cutting portion.
  • At least another one of the side links or one of the drive links includes a cutter element positioned in front of the cutting portion of a next cutter link. The cutter element is configured to generate a chip for removal by the cutter link.
  • FIG. 1 illustrates a side view of a chainsaw according to an example embodiment
  • FIG. 2 illustrates a side view of a chainsaw guide bar employing a chain according to an example embodiment
  • FIG. 3 illustrates a perspective side view of one cutter link
  • FIG. 4 illustrates a perspective side view of a cutter link employing a two step cutting and planing process in accordance with an example embodiment
  • FIG. 5 illustrates a side view of a chain including a cutter link employing a two step cutting and planing process in accordance with an example embodiment
  • FIG. 6 illustrates a perspective side view of a chain employing a two step cutting and planing process with separate links performing respective functions in accordance with an example embodiment
  • FIG. 7 illustrates a front view of the chain of FIG. 6 in accordance with an example embodiment
  • FIG. 8 illustrates a perspective side view of a cutter link capable of splitting chips for better chip transportation in accordance with an example embodiment
  • FIG. 9 illustrates a perspective side view of a chain employing cutter links of an example embodiment
  • FIG. 10 illustrates a perspective side view of an unsymmetrical cutter link according to an example embodiment
  • FIG. 11 illustrates a perspective side view of an alternative unsymmetrical cutter link in accordance with an example embodiment
  • FIG. 12 illustrates a perspective side view of a chain design in accordance with an example embodiment
  • FIG. 13 illustrates a front view of the chain of FIG. 12 in accordance with an example embodiment
  • FIG. 14 illustrates a side view of a chain design in accordance with an example embodiment.
  • FIG. 1 illustrates side view of a chainsaw 100 according to an example embodiment.
  • the chainsaw 100 may include a housing 110 inside which a power unit or motor (not shown) is housed.
  • the power unit may be either an electric motor or an internal combustion engine.
  • the power unit may include more than one electric motor where one such electric motor powers the working assembly of the chainsaw 100 and the other electric motor of the power unit powers a pump that lubricates the working assembly or provides momentum for moving other working fluids within the chainsaw 100.
  • the chainsaw 100 may further include a guide bar 120 that is attached to the housing 110 along one side thereof.
  • a chain (not shown) may be driven around the guide bar 120 responsive to operation of the power unit in order to enable the chainsaw 100 to cut lumber or other materials.
  • the guide bar 120 and the chain may form the working assembly of the chainsaw 100.
  • the power unit may be operably coupled to the working assembly to turn the chain around the guide bar 120.
  • the chainsaw 100 may include a front handle 130 and a rear handle 132.
  • a chain brake and front hand guard 134 may be positioned forward of the front handle 130 to stop the movement of the chain 122 in the event of a kickback.
  • the hand guard 134 may be tripped by rotating forward in response to contact with a portion of the arm (e.g., the hand/wrist) of the operator of the chainsaw 100.
  • the hand guard 134 may also be tripped in response to detection of inertial measurements indicative of a kickback.
  • the rear handle 132 may include a trigger 136 to facilitate operation of the power unit when the trigger 136 is actuated.
  • the rotating forces generated by the power unit may be coupled to the chain either directly (e.g., for electric motors) or indirectly (e.g., for gasoline engines).
  • the term "trigger,” as used herein, should be understood to represent any actuator that is capable of being operated by a hand or finger of the user.
  • the trigger 136 may represent a button, switch, or other such component that can be actuated by a hand or portion thereof.
  • Some power units may employ a clutch to provide operable coupling of the power unit to a sprocket that turns the chain.
  • a clutch to provide operable coupling of the power unit to a sprocket that turns the chain.
  • the trigger 136 if the trigger 136 is released, the engine may idle and application of power from the power unit to turn the chain may be stopped. In other cases (e.g., for electric motors), releasing the trigger 136 may secure operation of the power unit.
  • the housing 110 may include a fuel tank for providing fuel to the power unit.
  • the housing 110 may also include or at least partially define an oil reservoir, access to which may be provided to allow the operator to pour oil into the oil reservoir. The oil in the oil reservoir may be used to lubricate the chain as the chain is turned.
  • a clutch cover 150 may be provided to secure the guide bar 120 to the housing 110 and cover over the clutch and corresponding components that couple the power unit to the chain (e.g., the sprocket and clutch drum). As shown in FIG. 1, the clutch cover 150 may be attached to the body of the chainsaw 100 (e.g., the housing 110) via nuts 152 that may be attached to studs that pass through a portion of the guide bar 120. The guide bar 120 may also be secured with the tightening of the nuts 152, and a tightness of the chain can be adjusted based on movement of the guide bar 120 and subsequent tightening of the nuts 152 when the desired chain tightness is achieved.
  • other mechanisms for attachment of the clutch cover 150 and/or the guide bar 120 may be provided in other embodiments including, for example, some tightening mechanisms that may combine to tighten the chain in connection with clamping the guide bar 120.
  • the guide bar 120 may be formed from two laminate core sheets that lie in parallel planes along side each other to define a channel around a periphery of the guide bar 120.
  • the chain (or at least a portion of the chain) may ride in the channel, as the rest of the chain rides along the periphery of the guide bar 120 to engage media for cutting.
  • FIG. 2 illustrates a typical chain 200 disposed on the guide bar 120.
  • the chain 200 includes a plurality of center drive links 210 that each include a portion thereof that rides in the channel.
  • Each center drive link 210 is attached to an adjacent pair of side links 220 by rivets 230 that extend perpendicular to the longitudinal length of the links.
  • a rivet 230 is provided at the front portion of each center drive link 210 to attach the center drive link 210 to the rear portion of a preceding side links 220 and another rivet 230 is provided at the rear portion of each center drive link 210 to attach the center drive link 210 to the front portion of a subsequent side links 220.
  • each pair of side links 220 connects to opposing sides of the center drive links 210, and the connections are repeated in alternating fashion to complete a circular or endless chain.
  • one of the side links may be formed as a cutter link 240.
  • pairs of side links that do not include a cutter link 240 may be referred to as tie links 250.
  • the cutter links 240 may be provided with two portions including a depth gauge portion 260 and a cutting portion 270.
  • the cutting portion 270 may generally engage material that extends beyond the depth of the depth gauge portion 260 when the chain 200 is rotated.
  • the tie links 250 may not include cutting portions or depth gauge portions and may be provided to simply extend the length of the chain 200 while providing a space between portions of the chain 200 that will create friction during cutting operations.
  • the friction on the chain 200 would be very high, and it would be difficult to provide sufficient power to turn the chain, and control of the chainsaw 100 could also become difficult. Additionally, if the cutter links 240 were merely allowed to engage large portions of the media to be cut without a restriction on the cutting depth for each cycle, the friction would be high and the run of the chain would be less smooth. Accordingly, the depth gauge portion 260 allows a limit to be placed on the cutting depth or amount of material to be cut with each pass of the cutter link 240.
  • cutter links 240 are provided alternating on right and left sides of the chain.
  • left side cutter links and right side cutter links are generally symmetrical to provide for a smooth cut that makes a cutting path through the media being cut (e.g., wood) that is at least wider than the rivets 250 or, otherwise the widest part of the chain.
  • the left side cutters cut along the left side of the cutting path, and the right side cutters symmetrically cut along the right side of the cutting path.
  • the cutting done on opposing sides of the cutting path is performed sequentially via the symmetrical left and right side cutters engaging the wood.
  • the cutter links 240 may have a base portion 280 from which both the cutting portion 270 and the depth gauge portion 260 extend.
  • the rivets may be passed through holes in the base portion 280.
  • the cutting portion 270 may extend away from the base portion 280 in the same direction that the depth gauge portion 260 extends away from the base portion 280.
  • the depth gauge portion 260 may be at one end of the cutter link 240 and the cutting portion 270 may be at the other end, separated from each other by a gap 290.
  • the gap 290 may grow in size over time, as the cutting portion 270 is worn or abraded away due to use.
  • the cutting portion 270 may include a side plate 300 that extends upward away from the base portion 280.
  • the side plate 300 generally extends in a direction parallel to plane in which the base portion 280 lies, the side plate 300 does not necessarily also lie in the same plane.
  • the side plate 300 may have a curved shape to bend slightly out of the plane.
  • the side plate 300 may bend out of the plane and then back toward the plane as it extends away from the base portion 280.
  • the distal end of the side plate 300 may be joined with a top plate 310.
  • the top plate 310 may lie in a plane that is substantially perpendicular to the plane in which the base portion 280 lies.
  • the side plate 300 may have a leading edge 302 and an inside face 304.
  • the side plate may also have an outside face that is opposite the inside face 304, and a trailing edge that is opposite the leading edge 302.
  • the top plate 310 may have a leading edge 312 that extends substantially perpendicular to the direction of extension of the base 280 (and in some cases also the direction of extension of the leading edge 302 of the side plate 300).
  • the top plate 310 may also have a bottom face 314 and a top face 316.
  • the top face 316 may be opposite the bottom face 314 and, in some cases, the top and bottom faces 316 and 314 may be in parallel planes. However, in some cases, the top and bottom faces 316 and 314 may be angled slightly toward each other as they extend away from the side plate 300.
  • the top plate 310 may also have a trailing edge disposed opposite the leading edge 312.
  • the cutter link 240 may be formed by stamping, grinding and combinations thereof with or without other techniques also being employed.
  • the elevation difference between the depth gauge portion 260 and the cutting portion 270 of the cutter link 240 defines a cutting depth for the cutter link 240.
  • the depth gauge portion 260 therefore generally has a relatively blunt leading edge and does little to grind on the material being cut.
  • the leading edge 312 of the top plate 310 and the leading edge 302 of the side plate 300 may combine to grind and shear or plane the media being cut to generate chips and shavings while cutting a path through the media.
  • the side plate 300 may cut simultaneously with the planing action performed by the top plate 310. As such, the cutting and planing operations are all done in a single step.
  • an example embodiment may be provided to cut fibers (e.g., via a slicing action) prior to the planing operations being engaged.
  • an example embodiment is provided to perform cutting and planing in two separate steps that are performed in sequence on a particular portion of the media being cut.
  • the separate operations can be performed by one cutter link or multiple links in sequence, it should be appreciated that separate structures are provided in sequence (on one link or multiple links) to perform the cutting and planing operations in distinct steps rather than simultaneously. This may result in slicing done in the first step to liberate (or form) chips that can then more easily be planed off for removal.
  • the two step cutting and planing operation may be more efficient.
  • FIG. 4 illustrates an example embodiment in which a two stage cutting element 400 is provided to span across (and therefore include) two side links.
  • the two stage cutting element 400 is provided to span across opposing sides of the drive links before and after the two stage cutting element 400.
  • the two stage cutting element 400 includes two base portions (e.g., first base portion 410 and second base portion 420).
  • the first and second base portions 410 and 420 may include respective first and second slicer elements 430 and 440 that extend away from the first and second base portions 410 and 420, respectively, at a front end of the two stage cutting element 400.
  • the first and second slicer elements 430 and 440 may, at least in part, serve as depth gauges to define a cutting depth (or planing depth) for a planing portion 442, which follows the first and second slicer elements 430 and 440. However, the first and second slicer elements 430 and 440 may also function to slice the media being cut and form chips that can then be removed by the planing element 445 that forms the planing portion 442. As such, unlike a typical depth gauge, which is blunt, the first and second slicer elements 430 and 440 may each be sharpened at their respective distal ends to form a blade oriented forward (relative to the cutting direction) to slice media encountered during rotation of the chain. The slicing action occurs along a direction parallel to the sides of the guide bar on which the chain rotates.
  • the planing element 445 of this example links the first and second base portions 410 and 420 by spanning from a first side plate 450 to a second side plate 460 via a top plate 470.
  • the first and second side plates 450 and 460 may extend upward and away from the first and second base portions 410 and 420, respectively, similar to the direction and way that the first and second slicer elements 430 and 440.
  • the top plate 470 then spans across and joins distal ends of the first and second side plates 450 and 460. As shown in FIG. 4, the top plate 470 may define a leading edge that is arcuate in shape extending between opposing side limits of the top plate 470.
  • An apex of the arcuate shape of the leading edge may be substantially in alignment with the drive links to which the two stage cutting element 400 attaches.
  • the planing element 445 may cut along a plane that is substantially perpendicular to the plane in which the slicing action of the slicer elements occurs.
  • the two stage cutting element 400 When employed in a chain 500, as shown in FIG. 5, the two stage cutting element 400 may be moved in the direction 510 and a cutting portion 405 (formed by the first and second slicer elements 430 and 440) may slice the media being cut to form chips that can then be removed by the planing element 445 of the planing portion 442 in a separate step.
  • the chain 500 may include other side links 520 and 530, which may be bumpers or tie straps.
  • the other side links 520 and 530 may be operably coupled to the two stage cutting element 400 via drive links 540, and it should be appreciated that the initial cutting function could be performed at any of the other side links 520 and 530 instead of being performed all on one link.
  • FIG. 6 illustrates such an example.
  • a chain 600 may be provided to include a slicing link 610 that is configured to perform a slicing action similar to either of the first and second slicer elements 430 and 440.
  • the slicing link 610 may be provided in the chain 600 prior to the placement of a planing link 620.
  • FIG. 7 shows a front view of the arrangement.
  • the slicing link 610 initially performs a slicing or cutting action to form a chip, and then the planing link 620 performs a planing action to remove the chip.
  • Example embodiments may therefore provide a chain that performs cutting (or slicing) operations and planing operations in separate steps, with separate, sequentially ordered structures on the chain.
  • FIG. 8 illustrates an example embodiment in which a cutting element 640 is provided on a side link (e.g., a tie strap 650) that is paired with the cutter link 240.
  • a side link e.g., a tie strap 650
  • the cutting element 640 is provided on the opposite side relative to the side of the drive link on which the side plate 300 is provided.
  • the cutting element 640 may slice the media (or fiber) to free or create a chip that can then be more efficiently removed by the top plate 310 of the cutter link 240.
  • FIG. 9 illustrates such an example.
  • a cutting element 660 is provided at a trailing end of a side link, but is provided earlier in the order of links of the chain than the cutter links 240. Accordingly, the cutting element 660 may create a chip that can be more efficiently removed or transported by the cutter links 240.
  • the cutter links are divided into pairs and one pair has the function of precutting the wood to ensure that chips will be generated after each cutter link and therefore increase cutting efficiency and chip transportation.
  • Example embodiments may cut the media (e.g., wood) initially with a slicing action to create a chip, and then allow the freed chip to be more easily removed by the cutter links 240. Creating smaller wood chips would require less energy to transport the smaller chips away and therefore result in a higher cutting efficiency.
  • the cutting elements that perform the slicing action to create smaller chips can be on the side link paired with the cutter link 240 (if placed at the leading edge of the side link), or may be placed on any part of a drive link or other side link that precedes the cutter link 240 in the ordering of links in the chain.
  • cutter links 240 are provided alternating on right and left sides of the chain.
  • left side cutter links and right side cutter links are generally symmetrical to provide for a smooth cut that makes a cutting path through the media being cut (e.g., wood) that is at least wider than the rivets 250 or, otherwise the widest part of the chain.
  • the left side cutters cut along the left side of the cutting path, and the right side cutters symmetrically cut along the right side of the cutting path.
  • the cutting done on opposing sides of the cutting path is performed sequentially via the symmetrical left and right side cutters engaging the wood.
  • an unsymmetrical cutter link 700 may be provided to cut both left and right sides of the cutting path simultaneously. As such, although it may still be desirable to provide left side and right side cutters, it is not necessary since either only left side cutters or only right side cutters employing the unsymmetrical cutter link 700 would be capable of cutting the full width of the cutting path alone.
  • the unsymmetrical cutter link 700 may have a base portion 710 from which both a depth gauge portion 720 and a cutting portion 730 extend substantially perpendicular to the direction of chain extension (and movement).
  • the unsymmetrical cutter link 700 may be provided as one side link, and thus rivet holes may be provided through the base portion 710.
  • the rivets may be passed through the rivet holes in the base portion 710 to engage adjacent drive links and a tie strap or other side link that is paired with the unsymmetrical cutter link 700 on the opposing side of the drive links.
  • the rivets should be understood to pass through the base portion 710 in a transverse direction.
  • the rivets may extend transversely through, and slightly beyond the outer faces of the base portion 710 and any tie strap or other side link that is paired with the unsymmetrical cutter link 700.
  • the length of the rivets may define a minimum width that the cutting path must form in the wood or other media being cut.
  • the cutting portion 730 may include a top plate 740 and a side plate 750.
  • both the top plate 740 and the side plate 750 may have sharpened leading edges to allow the top plate 740 and the side plate 750 to more efficiently cut and/or grind on the media to be cut.
  • a leading edge of the top plate 740 may be formed to have an arcuate shape that extends from a first side limit 760 to a second side limit 770.
  • the first and second side limits 760 and 770 may represent the forward most portions of the top plate 740, and the leading edge of the top plate 740 may recess toward a rear of the cutting portion 730 to an apex 780.
  • a distance between the first and second side limits 760 and 770 may define the cutting path width 795.
  • the cutting path width 795 may be at least greater than the length of the rivets.
  • the apex 780 of every cutter link on the chain (when all cutter links are unsymmetrical cutter links 700) may be substantially in a same plane with the drive links and therefore approximately in a center of the cutting path (i.e., a midpoint of the cutting path width).
  • the first and second side limits 760 and 770 therefore span entirely across the width of the base portion 710, the drive link and the tie strap or other side link that is paired with the unsymmetrical cutter link 700 in the transverse direction.
  • the first and second side limits 760 and 770 may extend beyond respective opposing longitudinal ends of the rivets.
  • the side plate 750 does not necessarily also lie in the same plane.
  • the side plate 750 may have a curved shape to bend slightly out of the plane in the opposite direction from the direction of extension of the top plate 740.
  • the distal end of the side plate 750 may be joined with a top plate 740 and the top plate 740 may generally lie in a plane that is substantially perpendicular to the plane in which the base portion 710 lies.
  • the top plate 740 may be slightly curved to present a convex shape upward and a concave shape downward. Meanwhile in other cases, the top plate 740 may be substantially flat.
  • the unsymmetrical cutter link 700 may be formed by stamping, grinding and combinations thereof with or without other techniques also being employed.
  • the elevation difference between the depth gauge portion 720 and the cutting portion 730 of the unsymmetrical cutter link 700 defines a cutting depth for the unsymmetrical cutter link 700.
  • the depth gauge portion 720 therefore generally has a relatively blunt leading edge and does little to grind on the material being cut.
  • the leading edge of the top plate 740 as defined by the first and second side limits 760 and 770 and the apex 780 may combine to grind and shear or plane the media being cut to generate chips and shavings while creating the cutting path through the media.
  • the cutting path width is defined by a single cutter link (i.e., the width of the top plate 740 of the unsymmetrical cutter link 700).
  • both sides of the cutting path are cut simultaneously.
  • a single cutter link i.e., the unsymmetrical cutter link 700
  • the unsymmetrical cutter link 700 performs the job that two cutter links perform in a conventional chain.
  • Cutting forces exerted in the transverse direction i.e., sideways
  • the elimination of transverse direction forces may result in less sideways drift of the cutter links, which may provide a more consistent cutting width along the cutting path.
  • a higher cutting efficiency can be achieved.
  • cutter links 240 are provided alternating on right and left sides of the chain.
  • left side cutter links and right side cutter links are generally symmetrical to provide for a smooth cut that makes a cutting path through the media being cut (e.g., wood) that is at least wider than the rivets 250 or, otherwise the widest part of the chain.
  • the cutter links also have a top plate that extends out of the plane in which the side links generally lie. Accordingly, the cutter links tend to be susceptible to side forces that create instability and sideways drift that result in a rough cut.
  • example embodiments may provide for an improved chain with fewer portions or elements that extend out of plane. This may allow for a smoother and cleaner cut.
  • FIGS. 12-14 illustrate an example of such an improved chain.
  • each of the drive links 810 may have a grinding element 812 extending away from a base portion 814 thereof.
  • the grinding elements 812 of the drive links 810 may be disposed at a rear portion of each respective one of the drive links 810.
  • the side links 820 may include bumper elements 830 and/or grinding elements 840 that extend away from base portions 850 thereof.
  • the base portions 850 of the side links 820 and the base portions 814 of the drive links 810 may each lie in planes that are parallel to each other.
  • the base portions 850 of the side links 820 and the base portions 814 of the drive links 810 may also be adjacent to each other in the following order: right base portion of side link, base portion of drive link, left base portion of side link.
  • the side links 820 and drive links 810 may be operably coupled to each other via rivets 860 that pass through rivet holes 865 provided therein. Thus, the side links 820 and drive links 810 may fit together fairly closely.
  • the bumper elements 830 may be provided at rear portions of the side links 820 and may be slanted away from the direction of chain motion (shown by arrow 870).
  • the grinding elements 840 of the side links 820 may be provided generally at a front end of the corresponding side links 820.
  • the grinding elements 840 of the side links 820 and the grinding elements 814 of the drive links 810 may be placed substantially side by side with each other (when traversing straight portions of the guide bar 120).
  • the grinding elements 840 of the side links 820 and the grinding elements 814 of the drive links 810 may also have similar shapes and sizes (however, the grinding elements 814 of the drive links 810 may be slightly smaller). Placement of the grinding elements 840 of the side links 820 and the grinding elements 814 of the drive links 810 next to each other, and with similar sizes and shapes may allow these elements to mutually reinforce each other to maintain the entire chain less susceptible to sideways drift.
  • the bumper element 830 may act as a depth gauge to limit the exposure of the grinding elements 840 and 814. As such, a bumper element 830 precedes each pair of grinding elements 840 and 814. Moreover, bumper elements 830 are on alternate sides, as are the grinding elements 840 and 814, with respect to the sequence of links in the chain 800. Accordingly, in this example, a side link may have right side grinding elements and a left side bumper. The next side link (or at least the next side link with grinding elements) may then alternate to having left side grinding elements and a right side bumper.
  • the combination of a compact and reinforcing structure with alternating bumpers and grinding elements may create a smoother run by preventing the grinding elements 840 and 814 from taking too much wood on any one pass.
  • the smoother run also allows the chain 800 to cut more like a blade.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)

Abstract

L'invention concerne une chaîne de découpe (100) pour une tronçonneuse (500) qui peut comprendre une pluralité de maillons d'entraînement (540), une pluralité de maillons latéraux (520/530) fonctionnellement accouplés à des maillons parmi les maillons d'entraînement (540), un élément de tranchage (430/440) et un élément de rabotage (445). Les maillons d'entraînement (540) s'étendent dans une première direction sensiblement parallèle à des côtés d'une barre de guidage (120) autour de laquelle la chaîne de découpe (500) est rotative. Les maillons latéraux (520/530) sont fonctionnellement accouplés à des maillons respectifs parmi les maillons d'entraînement (540) et sont orientés de façon à se trouver dans des plans sensiblement parallèles à la première direction. Au moins certains des maillons latéraux (520/530) sont des maillons de découpe (400). L'élément de tranchage (430/440) s'étend parallèlement à la première direction pour découper un copeau dans un milieu à découper en réponse à la rotation de la chaîne de découpe (500). L'élément de rabotage (445) est disposé après l'élément de tranchage (430/440) dans la chaîne de découpe (500) et s'étend dans une direction sensiblement perpendiculaire à la première direction pour retirer le copeau découpé par l'élément de tranchage (430/440).
PCT/IB2016/051113 2015-03-04 2016-02-29 Conception de chaîne de tronçonneuse pour découpe et rabotage en deux étapes Ceased WO2016139569A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US201562128147P 2015-03-04 2015-03-04
US201562128140P 2015-03-04 2015-03-04
US201562128213P 2015-03-04 2015-03-04
US201562128226P 2015-03-04 2015-03-04
US62/128,147 2015-03-04
US62/128,226 2015-03-04
US62/128,213 2015-03-04
US62/128,140 2015-03-04

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WO2016139569A1 true WO2016139569A1 (fr) 2016-09-09

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112888540A (zh) * 2018-10-22 2021-06-01 胡斯华纳有限公司 用于改进的柔性磨削切割工具的链节元件
US20220212275A1 (en) * 2019-04-24 2022-07-07 Husqvarna Ab Chainsaw Cutting Link, A Saw Chain Comprising Such a Cutting Link, A Method for Manufacturing of a Cutting Link, and a Method of Grinding a Cutting Link

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1107535A (en) * 1913-01-28 1914-08-18 Horace Emmerson Martin Chain saw.
US1634643A (en) * 1924-02-07 1927-07-05 Samuel J Bens Interlocking link
US2565502A (en) * 1947-08-23 1951-08-28 Robert E F Johanson Saw chain
FR1104456A (fr) * 1954-05-06 1955-11-21 Scie à maillons articulés
US2891586A (en) * 1956-09-05 1959-06-23 John W Wright Cutting saw chain
US3340911A (en) * 1966-12-23 1967-09-12 Jerome L Wolf Chain saw

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1107535A (en) * 1913-01-28 1914-08-18 Horace Emmerson Martin Chain saw.
US1634643A (en) * 1924-02-07 1927-07-05 Samuel J Bens Interlocking link
US2565502A (en) * 1947-08-23 1951-08-28 Robert E F Johanson Saw chain
FR1104456A (fr) * 1954-05-06 1955-11-21 Scie à maillons articulés
US2891586A (en) * 1956-09-05 1959-06-23 John W Wright Cutting saw chain
US3340911A (en) * 1966-12-23 1967-09-12 Jerome L Wolf Chain saw

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112888540A (zh) * 2018-10-22 2021-06-01 胡斯华纳有限公司 用于改进的柔性磨削切割工具的链节元件
US11911926B2 (en) 2018-10-22 2024-02-27 Husqvarna Ab Link elements for improved flexible abrasive cutting tools
US20220212275A1 (en) * 2019-04-24 2022-07-07 Husqvarna Ab Chainsaw Cutting Link, A Saw Chain Comprising Such a Cutting Link, A Method for Manufacturing of a Cutting Link, and a Method of Grinding a Cutting Link
US12365040B2 (en) * 2019-04-24 2025-07-22 Husqvarna Ab Chainsaw cutting link, a saw chain comprising such a cutting link, a method for manufacturing of a cutting link, and a method of grinding a cutting link

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