WO2010033061A1 - Method and arrangement for a sawchain - Google Patents
Method and arrangement for a sawchain Download PDFInfo
- Publication number
- WO2010033061A1 WO2010033061A1 PCT/SE2008/051075 SE2008051075W WO2010033061A1 WO 2010033061 A1 WO2010033061 A1 WO 2010033061A1 SE 2008051075 W SE2008051075 W SE 2008051075W WO 2010033061 A1 WO2010033061 A1 WO 2010033061A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sawchain
- links
- link
- guide bar
- pivoting
- Prior art date
Links
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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/909—Cutter assemblage or cutter element therefor [e.g., chain saw chain]
Definitions
- the present invention concerns a method for a sawchain according to the introduction to claim 1 and a sawchain according to the introduction to claim 4.
- the invention concerns also the use of such a sawchain.
- the sawchain that is a component of the sawing device of a motor-driven sawing device is guided along a groove in the peripheral part of a guide bar and it takes at the outermost end or point of the guide bar a path that has a relatively small radius of curvature.
- Sawchains of this type generally comprise a linked or a mutually guided series of cutting links with cutters located at the sides, these cutters being alternately directed towards one side and the other side, a number of non-cutting intermediate links, known as intermediate links, that are united with the cutting links in a manner that allows pivoting, and a number of driving links, which are centrally located in the chain and whose driving tongue interacts with a peripheral groove that is located around the guide bar, in order to guide the passage of the chain, and with a driving wheel that is located at the end of the guide bar.
- the cutting links are designed as pairs consisting of one cutting link and one side link, these being united in a manner that allows pivoting with the central driving link through a rivet that functions as a pivot pin.
- the non-cutting links are designed in a similar manner as pairs consisting of two side links, that are united with the central driving link through a rivet in a manner that allows pivoting. Not only the cutting links but also the non-cutting links can be pivoted relative to each other in the principal plane of the guide bar through the rivet.
- the saw device that carries out the sawing operation is mounted in a protective saw box and has, in addition to a base structure, a saw motor, a driving wheel for driving the chain, a guide bar, a sawchain, a holder for the guide bar, and an element for carrying out a cutting action by feeding the guide bar into and out of the saw box.
- the saw motor is arranged to drive the sawing wheel, which in turn causes the sawchain to rotate around the pivotable guide bar.
- Efficient felling requires that the sawchain rotate at very high rotation speeds around the guide bar.
- One dangerous situation that can arise when sawing using the said type of saw device is, as a result of the high chain speeds, breakage of the sawchain through the failure of any one chain link, whereby parts that have been released by the broken chain, individual sawteeth, side links, driving links, or other parts that are released at high speed into the surroundings may cause serious injury.
- Such a situation may give rise not only to damage to objects but also injury to persons who are located in the vicinity of the area of operation of the forestry harvester.
- the said released parts are normally known by the general term "chain shot”, and may reach speeds that are comparable with those of pistol shots.
- Chain shots normally arise through the powerfully oscillatory movement of the rear part or the free end of the broken sawchain that occurs during the backwards return movement of the chain and its oscillation outwards from the point or end of the guide bar.
- the rear part of the broken sawchain thus performs a rapid whip-like movement backwards and forwards, which not seldom results in parts becoming freed from the end of the chain and flying out into the surroundings.
- the present invention thus has its principal area of use for sawchains that are intended to be used in a saw device, the felling head of a forestry harvester.
- One purpose of the present invention is to achieve a method of preventing the powerful oscillatory movement of the free end of a broken sawchain, and preventing its return movement that leads to parts of the sawchain becoming more readily detached from the broken chain.
- This purpose of the invention is achieved through the dimensions and stages that are specified in claim 1.
- a sawchain with such a design that the risk of chain shot has been eliminated is achieved with the characteristics and properties that are specified in claim 4. Further advantageous characteristics of the present sawchain are made clear by the non-independent claims.
- the present invention aims instead at solving the problems of chain shot by ensuring that the sawchain is given such a design that the risk of chain shot occurring is eliminated.
- the present invention eliminates the possibility of chain shot arising at all.
- it makes it possible to give the saw box and other component parts of the saw device the design that is desired in order to achieve a more efficient sawing operation and increased ease of service.
- the sawchain as such has the advantage that it can be simply mounted on any existing saw device without this saw device requiring any modification.
- Figure 1 shows a side view of one part of a sawchain according to the invention, partially with hidden contour lines according to the invention, whereby the chain runs along the straight part of a guide bar,
- Figure 2 shows the sawchain of Figure 1 in a horizontal view, viewed from above
- Figure 3 shows in detail and at an enlarged scale a side view of two side links coupled to one driving link where the side link that is in front has been angled downwards in the principal plane of the guide bar relative to the subsequent second side link and is located in an alternative position in which it is prevented from swinging upwards past a line that passes through the two pivot points of the two links,
- Figure 4 shows a cross-section through the sawchain and a part of the guide bar along the line IV-IV in Figure 1 , and
- Figure 5 shows a section of the sawchain in Figure 1 at a position in which it passes over one end of a guide bar that has a chain wheel that allows rotation.
- Figure 6 shows a side view of one part of a sawchain in a first alternative embodiment of the invention, whereby the chain runs along the straight part of a guide bar
- Figure 7 shows a cross-section through the sawchain and a part of the guide bar along the line VII-VII in Figure 8, at which two connected driving links are located and where the driving link that is in front is located in a locked position for oscillation around an axis upwards relative to the subsequent second driving link,
- Figure 8 shows a cross-section through the sawchain and a part of the guide bar along the line VIII-VIII in Figure 6,
- Figure 9 shows a side view of one part of a sawchain in a second alternative embodiment of the invention, whereby the chain runs along the straight part of a guide bar, and
- Figure 10 shows a cross-section through the sawchain and a part of the guide bar along the line X-X in Figure 9.
- Figure 1 shows a sawchain 1 of the type that is typically used in the saw device of a forestry harvester.
- the sawchain 1 comprises central driving links 2 at a fixed distance from each other, and side links, consisting of left and right side cutting links 3 and 4, respectively, together with side connecting links 5 that unite the neighbouring driving links 2 in a manner that allows pivoting.
- Each driving link 2 comprises an upper link body 6 and a lower protruding tongue 7, which is located for control of the sawchain in a continuous groove 8 that runs around the periphery of a guide bar 9 and which interacts with a chain wheel in a manner that allows rotation for driving of the sawchain 1 , which chain wheel is located at one end of the guide bar whereby cutting is carried out by rotation of the guide bar around an axis that coincides with the axis of the chain wheel.
- Figure 5 is referred to with respect to the rotating chain wheel for driving the sawchain 1 around the guide bar 9.
- the sawchain 1 moves during normal operation clockwise around the guide bar 9, from the guide bar 9 at the driving wheel and back above the driving wheel, and the links rotate relative to each other in the principal plane of the guide bar 9.
- the side links 3, 4 and 5 comprise a link body 10 the innermost edge of which faces the centre of the sawchain and glides along the outer edge 11 of the guide bar 9, a depth gauge 12 that extends outwards from the forward part of the link body of the cutting link, and a cutting element 13 that extends outwards from the link body 10 and that is located behind the depth gauge.
- the edge of the sawchain that has side links 3, 4 and 5 that face outwards provided with cutting elements 13 forms the processing part of the sawchain.
- the cutting elements 13 may be of any known type whereby the elements shown here are of the type known as "bucket" type.
- the cutting links 3, 4 are identical, with the exception of the fact that they have alternating right-side and left-side set.
- Each one of the bodies 10 of the side links 3, 4, 5 is provided with a pair of rivet holes 14, while the bodies 2 of the central driving links are provided with a pair of rivet holes 15.
- the rivet holes are located close to the ends of the links and a rivet 16 passes through the rivet holes, this rivet connecting in a manner that allows pivoting each driving link 2 with a pair of side links 3, 4, 5 located opposite each other in a sideways direction.
- Each link has, as a consequence of this, a pair of pivot axes 17 that are located at a distance from each other when viewed in the longitudinal direction of the chain link, see Figure 2.
- a means 20 of limiting pivoting is arranged on the link body 6 of each driving link 2 in the form of a protrusion 21 that protrudes sideways from the link body in one direction and that is located in the region between two of the opposing edge sections 3a, 4a, 5a of the side links 3, 4, 5 (see Figure 3).
- the protrusion 21 is located somewhat above the central line 22 through the rivet holes 15 and it is an advantage if it has been formed through local depression in the link body 6 by means of a punch impression tool, such that the material excess that is obtained bulges out sideways from the link body.
- the protrusion 21 can be arranged directly during the production of the driving link, in association with, for example, the punching out of the driving links from a sheet metal blank.
- the opposing edge sections 3a, 4a, 5a of the two side links 14, 15, 16 are designed such that they interact with the protrusion in such a manner that the side links 3, 4, 5 and thus the sawchain 1 can be freely unlinked or curved in the principal plane of the guide bar in one direction, while only limited curvature or unlinking possibility in the principal plane of the guide bar is allowed in a second, opposite, direction.
- the side links 14, 15 16, which are located on opposite sides of each central driving link 2 in the direction of motion of the sawchain, can in this way be caused to pivot or rotate essentially freely when the sawchain located on the guide bar 9 moves in a sharply curved pathway around a driving wheel, or around the point of the guide bar as is shown in Figure 5.
- a side view is there shown at an enlarged scale two side links 3 and 5 on a driving link 2 connected to the axis 16, where one of the side link 3, the forward side link, is angled downwards in the principal plane of the guide bar relative to the driving link 2 and is located in an alternative upwardly angled position, illustrated with a dash-dot contour line.
- the position of the forward side link 3, its principal axis, relative to the driving link 2 is denoted by the line 23, extending through the centre of the relevant rivet hole 14 of the side link.
- the line 22 denotes a central line that extends through the relevant rivet hole 15 of the rear driving link 2.
- the means 20 of limiting the pivoting is thus so designed that the forward side link 3 is prevented from further pivoting upwards when the pivot axes 23, 22 of the two parts 3, 2 are essentially coincident, i.e. in the situation in which the angle denoted by A is 0°.
- Selection of the design of the means 20 of limiting pivoting will, of course, make it possible within the scope of the invention to allow the pivot axes 23, 22 intersect with a freely chosen angle A, i.e. the condition in which the central line 23 of the forward side link 3 is to intersect with the central line 22 of the driving link and at which further upwards pivoting around the joint axis 16 is to become blocked.
- the protrusion 21 another suitable design that has the same or a similar technical function, or that it is made from some other material than metal: it would be possible, for example, to attach an elastomeric material such as rubber onto the link body, preferably through vulcanisation.
- an elastomeric material such as rubber
- the present chain behaves exactly as any other known sawchain without loss of power when carrying out normal cutting operations of the type that is carried out by the saw device of a forestry harvester.
- the means 20 of limiting pivoting comes into operation and prevents the free ends of the broken chain from pivoting out from the end of the guide bar and thus also prevents the possibility of the chain end from carrying out a whip-like movement backwards and forwards.
- the sawchain comprises central driving links 2 at a fixed distance from each other, and side links, consisting of left and right side cutting links 3 and 4, respectively, together with side connecting links 5 that unite the neighbouring driving links 2 in a manner that allows pivoting, joined also in a manner that allows pivoting with the forward and rearward parts of the central driving links by means of axes 16 that are located at a distance from each other in the longitudinal direction of the chain.
- the means 20 of limiting pivoting in this embodiment does not comprise a member 21 that protrudes in a horizontal direction and occupies a part of the space between the opposite edge sections 3a, 4a, 5a of neighbouring links 3, 4, 5.
- the opposite edge sections 3a, 4a, 5a of neighbouring links 3, 4, 5 have instead been given such an immediate form that they allow a forwardly located side link of the chain to pivot around the axis 16 in a first direction relative to a subsequent central driving link 2 but limit the ability of the side link to pivot around the axis in an opposite direction relative to the driving link 2.
- Figure 7 not only have the opposite edge sections 3a, 4a,
- the sawchain comprises central driving links 2 at a fixed distance from each other, and side links 5, consisting of left and right side cutting links 3 and 4, respectively, together with side connecting links 5 that unite the neighbouring driving links 2 in a manner that allows pivoting, joined also in a manner that allows pivoting with the forward and rearward parts of the central driving links by means of axes 16 that are located at a distance from each other in the longitudinal direction of the chain.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK08813572.8T DK2342054T3 (en) | 2008-09-17 | 2008-09-25 | Process and arrangement for a saw chain |
CA2737432A CA2737432C (en) | 2008-09-17 | 2008-09-25 | Method and arrangement for a sawchain |
US13/119,381 US9168671B2 (en) | 2008-09-17 | 2008-09-25 | Method and arrangement for a sawchain |
AU2008361775A AU2008361775B2 (en) | 2008-09-17 | 2008-09-25 | Method and arrangement for a sawchain |
EP08813572.8A EP2342054B1 (en) | 2008-09-17 | 2008-09-25 | Method and arrangement for a sawchain |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0801985-3 | 2008-09-17 | ||
SE0801985A SE532991C2 (en) | 2008-09-17 | 2008-09-17 | Saw chain method and device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010033061A1 true WO2010033061A1 (en) | 2010-03-25 |
Family
ID=42039736
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2008/051075 WO2010033061A1 (en) | 2008-09-17 | 2008-09-25 | Method and arrangement for a sawchain |
Country Status (7)
Country | Link |
---|---|
US (1) | US9168671B2 (en) |
EP (1) | EP2342054B1 (en) |
AU (1) | AU2008361775B2 (en) |
CA (1) | CA2737432C (en) |
DK (1) | DK2342054T3 (en) |
SE (1) | SE532991C2 (en) |
WO (1) | WO2010033061A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012095177A1 (en) * | 2011-01-13 | 2012-07-19 | Gardena Manufacturing Gmbh | Kickback reducing chain link |
US9027451B2 (en) * | 2012-10-02 | 2015-05-12 | Blount, Inc. | Dresser drive link for saw chain |
US8887604B2 (en) | 2012-11-20 | 2014-11-18 | Blount, Inc. | Dresser link for saw chain |
EP3194130B1 (en) * | 2014-09-03 | 2020-04-01 | Cosberg S.p.A. | Method for manufacturing, chain sub-units and machine |
EP3265281A1 (en) * | 2015-03-04 | 2018-01-10 | Husqvarna AB | Cutting chain for a chainsaw |
US11273573B2 (en) * | 2016-01-13 | 2022-03-15 | Oregon Tool, Inc. | Saw chain link with one or more oversized rivet holes |
DE102018201816A1 (en) * | 2018-02-06 | 2019-08-08 | HighTechCOM GmbH | Saw chain, guide rail and sprocket of a chain saw |
SE543193C2 (en) * | 2018-06-12 | 2020-10-20 | Husqvarna Ab | Sprocket arrangement for a saw chain, combination of a sprocket arrangement and a saw chain and a handheld power tool |
Citations (5)
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BE419968A (en) * | ||||
US3283789A (en) * | 1963-09-23 | 1966-11-08 | Omark Industries Inc | Saw chain |
US3910147A (en) * | 1972-11-29 | 1975-10-07 | Elkem Spigerverket As | Chain saw sword, a saw chain and method of forming saw chain |
US4796502A (en) * | 1987-08-26 | 1989-01-10 | Pro Power Corporation | Saw blade structure with depth-control means |
US5988035A (en) * | 1992-11-09 | 1999-11-23 | Hard-Stiftung | Sawing chain for chain saws |
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US3124179A (en) * | 1964-03-10 | Foreign | ||
US1273394A (en) * | 1917-11-30 | 1918-07-23 | George Meyer | Chain saw. |
US1419968A (en) * | 1921-07-01 | 1922-06-20 | Hilding J Johnson | Gun |
US1766013A (en) * | 1926-12-28 | 1930-06-24 | Brown Co | Portable chain saw |
DE481949C (en) * | 1927-01-26 | 1929-09-05 | Chain Saw Corp | Chain band saw |
US1779083A (en) * | 1927-01-26 | 1930-10-21 | Chain Saw Corp | Link for belts or chain saws |
US2488343A (en) * | 1945-07-30 | 1949-11-15 | Stanley E M Standal | Chain saw |
US2583243A (en) * | 1950-04-03 | 1952-01-22 | Tweedie Charles James | Chain saw |
US2749950A (en) * | 1951-11-14 | 1956-06-12 | Jamieson Saw Chain Inc | Insert tooth for power saw chain |
US2798517A (en) * | 1954-12-23 | 1957-07-09 | John F Carney | Chain saw |
US2902068A (en) * | 1956-08-20 | 1959-09-01 | Mcculloch Motors Corp | Saw chain having rear-back control |
US3608595A (en) * | 1968-07-10 | 1971-09-28 | John W Oehrli | Saw chain |
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DE3326643A1 (en) * | 1983-07-23 | 1985-01-31 | Fa. Andreas Stihl, 7050 Waiblingen | SAW CHAIN FOR A CHAINSAW |
DE3830025A1 (en) * | 1988-09-03 | 1990-03-08 | Stihl Maschf Andreas | SAW CHAIN FOR MOTOR CHAIN SAWS |
US5226404A (en) * | 1989-09-22 | 1993-07-13 | Mitsubishi Metal Corporation | Cutting apparatus |
US4958670A (en) * | 1990-02-05 | 1990-09-25 | Ctr Manufacturing, Inc. | Tree felling apparatus |
US5184598A (en) * | 1991-07-15 | 1993-02-09 | Blount, Inc. | Saw chain for aggregate materials |
US6138658A (en) * | 1999-03-12 | 2000-10-31 | Blount, Inc. | Concrete cutting chain with sealed joints |
-
2008
- 2008-09-17 SE SE0801985A patent/SE532991C2/en unknown
- 2008-09-25 AU AU2008361775A patent/AU2008361775B2/en active Active
- 2008-09-25 CA CA2737432A patent/CA2737432C/en active Active
- 2008-09-25 WO PCT/SE2008/051075 patent/WO2010033061A1/en active Application Filing
- 2008-09-25 DK DK08813572.8T patent/DK2342054T3/en active
- 2008-09-25 US US13/119,381 patent/US9168671B2/en active Active
- 2008-09-25 EP EP08813572.8A patent/EP2342054B1/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE419968A (en) * | ||||
US3283789A (en) * | 1963-09-23 | 1966-11-08 | Omark Industries Inc | Saw chain |
US3910147A (en) * | 1972-11-29 | 1975-10-07 | Elkem Spigerverket As | Chain saw sword, a saw chain and method of forming saw chain |
US4796502A (en) * | 1987-08-26 | 1989-01-10 | Pro Power Corporation | Saw blade structure with depth-control means |
US5988035A (en) * | 1992-11-09 | 1999-11-23 | Hard-Stiftung | Sawing chain for chain saws |
Also Published As
Publication number | Publication date |
---|---|
AU2008361775A1 (en) | 2010-03-25 |
CA2737432A1 (en) | 2010-03-25 |
US9168671B2 (en) | 2015-10-27 |
CA2737432C (en) | 2015-05-26 |
SE532991C2 (en) | 2010-06-01 |
AU2008361775B2 (en) | 2015-11-19 |
EP2342054B1 (en) | 2018-05-30 |
SE0801985A1 (en) | 2010-03-18 |
DK2342054T3 (en) | 2018-08-13 |
US20110226112A1 (en) | 2011-09-22 |
EP2342054A4 (en) | 2017-05-24 |
EP2342054A1 (en) | 2011-07-13 |
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