EP0933176B1 - Sägekettenschneidglied mit abgewinkelten Schneidtiefenbegrenzer - Google Patents

Sägekettenschneidglied mit abgewinkelten Schneidtiefenbegrenzer Download PDF

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Publication number
EP0933176B1
EP0933176B1 EP99108138A EP99108138A EP0933176B1 EP 0933176 B1 EP0933176 B1 EP 0933176B1 EP 99108138 A EP99108138 A EP 99108138A EP 99108138 A EP99108138 A EP 99108138A EP 0933176 B1 EP0933176 B1 EP 0933176B1
Authority
EP
European Patent Office
Prior art keywords
cutter
depth gauge
plane
body portion
region
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.)
Expired - Lifetime
Application number
EP99108138A
Other languages
English (en)
French (fr)
Other versions
EP0933176A2 (de
EP0933176A3 (de
Inventor
James O. Burrows
Randall D. Jensen
Kent L. Huntington
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.)
Oregon Tool Inc
Original Assignee
Blount Inc
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
Priority claimed from US08/338,334 external-priority patent/US5599011A/en
Application filed by Blount Inc filed Critical Blount Inc
Priority claimed from EP95850202A external-priority patent/EP0712700B1/de
Publication of EP0933176A2 publication Critical patent/EP0933176A2/de
Publication of EP0933176A3 publication Critical patent/EP0933176A3/de
Application granted granted Critical
Publication of EP0933176B1 publication Critical patent/EP0933176B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B27B33/141—Saw chains with means to control the depth of cut

Definitions

  • the present invention relates to a cutter for an endless cutter device movable along a path for cutting a kerf in a work piece, said cutter in an upright position comprising:
  • a cutter of the above preamble is known from US-A-4,911,050, which discloses a bent-over depth gauge, whereby there is a face of the depth gauge sliding of a kerf produced.
  • the present invention relates to an improved cutter, and more particularly to a cutter which has an improved depth gauge.
  • Cutters for endless cutter devices movable along a path for cutting a kerf in a work piece such as may be found in a saw chain for cutting wood, generally have a cutter portion with a leading cutting edge and a depth gauge portion spaced forwardly of the cutting edge to control the depth of cut taken by the cutter.
  • the depth gauge is instrumental in reducing the possibility of kickback during operation of the saw on which the chain runs.
  • Depth gauges in the past generally have included a single thickness of cutter material which extends upwardly in a region spaced forwardly from the cutter edge as disclosed in Silvon U.S. Patent No. 4,353,277. others have included bent-over depth gauge portions such as disclosed in U.S. Patents Nos. 5,085,113 and 4,989,489 to Pinney, U.S. Patent No. 4,911,050 to Nitschmann and U.S. Patent No. 4,841,825 to Martin.
  • the single thickness upright depth gauge as illustrated in 4,353,277 may have a tendency to dig into the work piece and not provide consistent cutting depth control. Further it is less stable than a bent-over depth gauge.
  • the bent-over depth gauges illustrated in 4,911,050; 4,989,489; and 5,085,113 generally have substantially rectangular configurations as viewed in plan.
  • the depth gauge of 4,841,825 wraps over the majority of the chain width and substantially encloses the space leading the cutter edge.
  • the object of the present invention is to lend additional stability to the cutter during operation.
  • Fig. 1 at 10 is indicated generally a section of a cutter chain for use with a chain saw.
  • the chain includes left and right hand cutter links 12, 14, center drive links 16 and connector links 18, 20. All of these links have bores extending therethrough adjacent opposite ends. Rivets 22, acting as pivot pins, extend through aligned bores in the links to pivotally interconnect the cutter, drive, and connector links together.
  • the chain is supported for travel on a guide bar, a portion of which is indicated at 26 having a groove 28 in which depending tang portions of drive links 16 slidably move.
  • the undersides of the cutter links and connector links ride slidably along supporting guide rails 26a, 26b at opposite sides of groove 28.
  • a left-hand cutter link 12 is illustrated in enlarged form to illustrate an embodiment of the present invention.
  • the cutter, or cutter link, 12 includes a substantially planar upright body portion 32 having a center plane noted generally at 33.
  • a pair of spaced apart rivet receiving bores 34, 36 extend through the rear, or heel, region 32a and the front, or toe, region 32b, respectively, of body 32.
  • the centers of bores 34, 36 are aligned on a center line 39 which is generally parallel to the guide rails 26a, 26b on which the chain runs.
  • the underside 41 of the cutter body under bore 36 in the toe region adjacent the front of the cutter is spaced a selected distance 41a beneath the center of bore 36.
  • the underside 43 of the cutter body under the center of bore 34 is clipped so that it angles upwardly on progressing to the rear at an angle of 1-1/20 to 50 relative to centerline 39.
  • the distance 43a to the underside of portion 43 from the center of bore 34 is less than distance 41a, preferably in a range of 0.01 to 0.08inch. This distance will vary in relation to the size and style of cutter.
  • the rear end region 32a of the body has a cutter portion 40 thereon.
  • the cutter portion includes a cutter top plate portion 42 and a forwardly facing cutting edge 44.
  • the cutter top plate portion is bent over at substantially a right angle relative to and overlies body portion 32 of the cutter.
  • the cutting edge 44 extends transversely of the plane of the body portion and overlies the body portion.
  • the cutting edge 44 is spaced a selected elevation above the body portion for cutting purposes.
  • the free outer end of the cutting edge 44 is spaced a distance 45 from the center plane 33 of the body portion.
  • a depth gauge portion 46 is mounted on the front end region 32b of the body portion.
  • the depth gauge portion includes a plate portion 48 which is bent over at a substantial angle relative to the plane of the body portion and has a substantially planar upper surface 48a which is inclined continuously downwardly on progressing forwardly in the cutter.
  • the depth gauge portion in the illustrated cutter is bent over at substantially a right angle relative to the plane of the body portion and overlies the body portion.
  • a juncture section 52 disposed at a slight angle relative to the plane of body portion 32 interconnects the body portion and depth gauge portion and the depth gauge is cantilevered outwardly therefrom with a free outer edge.
  • the depth gauge plate portion 48 is multi-angular, and in this embodiment is substantially pentagonal.
  • the rearwardly facing rear edge of the plate portion 48 has a central portion 56 nearest cutting edge 44.
  • the rear edge has opposed side portions 58, 60 which in the illustrated embodiment extend forwardly from central portion 56 and diverge from each other on progressing forwardly from the central portion.
  • the central portion 56 is formed by the juncture of side portions 58, 60, is substantially a convex curve, and has a width which is a minor portion of the overall width of the depth gauge.
  • the side portion 58 could extend perpendicular to center plane 33 from central portion 56, if desired, with side portion 60 alone extending forwardly and downwardly from the central portion. However, it is believed that operational benefits occur by having both sides 58, 60 angled forwardly from the central portion.
  • cutting edge 44 has a defined width 47 extending laterally, or transversely, of the cutter, and central portion 56 of the rear edge of the depth gauge is disposed intermediate, and here substantially centrally of, opposite ends of the cutting edge.
  • central portion 56 As side portions 58, 60 extend forwardly from central portion 56, not only do they diverge from each other but they also slope downwardly from central portion 56. Thus, central portion 56 is disposed at the greatest elevation relative to the body portion and nearest the elevation of cutter edge 44. The central portion 56 of the rear edge of the depth gauge is aligned forwardly of an intermediate region of the cutting edge 44.
  • the juncture between rear edge side portion 60 and side edge 66 is formed in a convexly curved outer edge 70 which is at the region of maximum width for the depth gauge. Since the depth gauge plate portion 48 is joined only along side edge 64 to juncture portion 52, it has a free side region extending away from the body portion which includes rear edge side portion 60 and side edge 66 which converge in the convex curve at central region 70. As is best seen in Figs. 3 and 4, the maximum width portion 70 of the depth gauge is disposed at an elevation intermediate the highest and lowest portions of the depth gauge, between the front and rear edges of the depth gauge. As seen in Figs.
  • the maximum width 71 of the depth gauge portion is at least as great or greater than the width 47 of the cutter portion 40 following it. Further, the outer edge 70 of the depth gauge projects a distance 73 laterally of central plane 33 which is greater than the distance 45 for cutter edge 44.
  • a right-hand cutter 14 is illustrated which follows cutter 12 in the chain as shown in Fig. 1.
  • a major portion of the top plate of the cutter 14 and its depth gauge are broken away so that they do not interfere with illustration of the major portions of cutter 12.
  • central region 70 of depth gauge 46 in the embodiment of cutter 12 illustrated extends outwardly beyond the width of top plate 44 toward the side of the kerf which would be cut by the side cutting edge of cutter 14. Such extension of the depth gauge toward the opposite side of the chain has been found to improve chain stability during cutting.
  • distance 74 denotes the elevational distance that the uppermost portion of depth gauge 46 is spaced below the uppermost edge of cutting edge 44. This is known generally as the depth gauge setting for the cutter.
  • depth gauge 46 is spaced a distance forwardly of cutter portion 40 to provide an open gullet space 78 therebetween.
  • FIG. 3 Various angular relationships between the sides, or edges, of the depth gauge are illustrated in Fig. 3.
  • a line 82 is drawn extending normal to the central plane of the cutter body.
  • Angles 84 and 86 denote the orientations of rear edge side portions 58, 60, respectively, relative to line 82.
  • An included angle 88 is defined between rear edge side portions 58, 60.
  • Another line 90 is drawn extending normal to the central plane of the cutter adjacent the forward end of the depth gauge.
  • Angles 94, 96 denote the orientations of side edge 66 and front edge 68, relative to line 90.
  • depth gauge setting distance 74 may be in a range of 0.015 to 0.030 inch.
  • the following sizes, angles and distances are measured along a horizontal plane, indicated generally at 91 in Fig. 2, and as viewed in plan in Fig. 3.
  • Depth gauge portion 46 may have an overall length of approximately 0.175-0.30 inch.
  • Outer edge 70 of the depth gauge would be in a range of 0.050 to 0.150 inch forwardly of rear edge central portion 56.
  • Angle 84 may be in a range of 00 to 300 (preferably 100 to 300), angle 86 in a range of 100 to 400, and included angle 88 in a range of 1100-1700, and preferably 1100 to 1600.
  • Angle 94 is in a range of 100-550 and angle 96 in a range of 00 to 150.
  • the downward slope 98 of the upper planar surface 48a as shown in Fig. 2 is in a range of 250 to 350.
  • a dashed line 100 illustrates generally the outline of substantially rectangular depth gauges of prior art devices. Such have not permitted free flow of cut chips to pass easily into the gullet region and under the top plate 42 of the cutter. This inability to free the kerf of debris has resulted in vibration, excessive friction, and other impediments to efficient cutting.
  • the configuration of the present embodiment with a depth gauge portion which has angularly disposed sides 58, 60 and a central region 56 at its greatest elevation intermediate the width of the cutter edge permits free flow of chips past the depth gauge rear edge side portions so that debris flows freely into the gullet region and under the cutter top plate toward the chassis of the chain. This free flow of chips is further enhanced by the positioning of the side edges and front edge. Further, friction is minimized by minimizing the amount of the depth gauge which engages the kerf and debris within the kerf.
  • central portion 56 is the highest and rearwardmost portion of the depth gauge and that remainder portions of the depth gauge incline downwardly and forwardly therefrom.
  • the bent-over depth gauge is described here on a cutter with a clipped heel, it should be recognized that the depth gauge configuration can be used in cutters without a clipped heel.
  • the depth gauge of the present invention provides many operational benefits independently of, as well as in conjunction with, a clipped heel configuration.
  • FIGs. 5-7 illustrate another embodiment of the invention.
  • a cutter 12a is illustrated having a cutter portion 40a with a forwardly facing cutting edge 44a.
  • a depth gauge portion 46a is mounted on the front end of the body portion of the cutter and is bent over at a substantial angle relative to the plane of the body portion. It has a substantially planar upper surface 48b which is inclined downwardly on progressing forwardly in the cutter.
  • the depth gauge portion 46a illustrated in Figs. 5-7 is multi-angular, and in this embodiment is substantially hexagonal.
  • the configuration of the depth gauge 46a is somewhat similar to that previously described for depth gauge 46, except that in this configuration, rather than having a convexly curved outer edge region 70 between edges 60 and 66, there is a substantially flat side 70a provided between side edges 60a, 66a.
  • depth gauge portion 46 leading cutting edge 44 In operation of a saw chain having a cutter constructed as illustrated, as the saw chain is driven forwardly the depth of cut is controlled by depth gauge portion 46 leading cutting edge 44.
  • the depth gauge portion having the configuration illustrated provides effective depth gauge control, chain stability and kickback minimization while permitting chips produced in the kerf of the work piece to flow freely past the depth gauge and into the chassis region of the chain underlying the bent-over cutter portion 42 of the cutter.
  • the bent-over depth gauge design of the present embodiment provides sufficient width to produce kickback control for safety, while still producing improved chip flow.
  • the two diverging sides 58 and 60 of the rear edge extend forwardly and downwardly with respect to the cutting edge, whereby thus none of these sides extends perpendicular to the plane 33 of the body portion.

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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)

Claims (10)

  1. Schneidwerkzeug (12, 14) für eine Endlosschneidvorrichtung (10), bewegbar entlang einer Bahn zum Schneiden einer Kerbe in ein Werkstück, wobei das Schneidwerkzeug in einer senkrechten Stellung angeordnet ist und umfaßt:
    einen Grundkörperabschnitt (32), der in einer im wesentlichen senkrechten Ebene (33) eingerichtet ist und einen vorderen Bereich (32b) und hinteren Bereich (32a) aufweist, wobei
    ein Schneidabschnitt (40) auf dem hinteren Bereich des Grundkörperabschnitts angeordnet ist, der eine vorwärts gerichtete Schneidkante (44) aufweist, die sich quer zu der Ebene (33) erstreckt, mit einer gewählten Stärke (47) wie sie normal zur Ebene des Grundkörperabschnitts bemessen ist und die mit einer sich über dem Grundkörperabschnitt erstreckenden gewählten Überhöhung angeordnet ist, und
    einen tiefer bemessenen Abschnitt (46) auf dem vorderen Bereich des Grundkörperabschnitts, wobei der tiefer bemessene Abschnitt einen plattenförmigen Abschnitt (48) umfaßt, der in einem im wesentlichen rechten Winkel in bezug zur Ebene des Grundkörperabschnitts gebogen verläuft, und der eine obere Fläche (48a) aufweist, die von einer rückwärts gerichteten, hinteren Kante (56) des plattenförmigen Abschnitts, welche in einer benachbart zur Höhe der Schneidkante, jedoch unterhalb, angeordnet ist, und nach hinten geneigt ist zu einer nach vorne gerichteten, vorderen Kante (68) des plattenförmigen Abschnitts, welche in einer niedrigeren Höhe angeordnet ist, dadurch gekennzeichnet, dass der tiefer bemessene Abschnitt einen maximal ausgebildeten Bereich aufweist, mit einer zur Ebene des Grundkörperabschnittes normal bemessenen Breite (71), welche wenigstens so groß ist wie die Breite (47) der Schneidkante.
  2. Schneidwerkzeug nach Anspruch 1, wobei der Schneidabschnitt und der tiefer bemessene Abschnitt freie Seitenbereiche aufweisen, die sich quer zur Ebene des Grundkörperabschnitts hinaus erstrecken, und wobei sich der freie Seitenbereich (70) des tiefer bemessenen Abschnitts unter einer Distanz (73) erstreckt die gleich oder größer als die Distanz (45) des Schneidabschnitts über der Ebene des Grundkörperabschnitts ist.
  3. Schneidwerkzeug nach Anspruch 1, wobei der Schneidabschnitt einen Schneidplattenabschnitt (42) umfaßt, der unter einem beträchtlichen Winkel gebogen ist in bezug zur Ebene und die sich unter einer ersten Distanz (45) quer zu der Ebene bzw. über die Ebene des Grundkörperabschnitts erstreckt, und wobei der tiefer bemessene Abschnitt sich quer zur Ebene bzw. über die Ebene des Grundkörperkörperabschnitts unter einer zweiten Distanz (73) erstreckt, die gleich oder größer zur ersten Distanz ist.
  4. Schneidwerkzeug nach Anspruch 1, wobei der maximale breite Bereich des tiefer bemessenen Abschnitts zwischen den vorderen und hinteren Kanten angeordnet ist und wobei der tiefer bemessene Abschnitt gegenüberliegende Seitenkanten (64, 66) aufweist, welche sich nach vorne über den maximalen breiten Bereich erstrecken und aufeinander zulaufen, während sie sich von da nach vorne erstrecken.
  5. Schneidwerkzeug nach Anspruch 4, wobei beide Seitenkanten (64, 66) auf die zentrale Ebene des Körpers zusammenlaufen um sich nach vorne von dem maximalen breiten Bereich zu erstrecken.
  6. Schneidwerkzeug nach Anspruch 4, wobei die Kanten (66) auf die zentrale Ebene des Körperbereichs zulaufen unter einem Winkel im Bereich von 35 Grad bis 80 Grad.
  7. Schneidwerkzeug nach Anspruch 4, wobei die vordere Kante (68) des tiefer bemessenen Abschnitts sich zwischen den gegenüberliegenden Seiten erstreckt und die eine normal bemessene Breite zur Ebene des Grundkörperabschnitts aufweist, welche schmaler als die Schneidkante ist.
  8. Schneidwerkzeug nach Anspruch 7, wobei die Breite der vorderen Kante (68) ein kleiner Abschnitt von der Breite der Schneidkante ist.
  9. Schneidwerkzeug nach Anspruch 1, wobei der maximalste breiteste Bereich des tiefer bemessenen Abschnitts zwischen den vorderen und hinteren Kanten angeordnet ist und die hintere Kante einen zentralen Bereich (56) aufweist, welcher der Schneidkante am nächsten ist, und einen Seitenabschnitt (60), welcher sich nach vorne erstreckt und sich von dem zentralen Bereich nach unten zum maximalsten Bereich unter einem Winkel in bezug zur Ebene des Grundkörperabschnitts erstreckt.
  10. Kette mit Schneidwerkzeugen (10), umfassend eine Mehrzahl von drehbar miteinander verbundenen Zwischengliedern, die Schneidwerkzeugglieder (12, 14) einschließen, mit einem Schneidwerkzeugglied in dieser Kette in einer aufrechten Stellung, bestehend aus:
    einem Grundkörperabschnitt (32), der in einer im wesentlichen aufrechten Ebene eingerichtet ist und einen vorderen Bereich (32b) und einen hinteren Bereich (32a) aufweist, wobei
    ein Schneidabschnitt (40) auf dem hinteren Bereich des Grundkörperabschnitts angeordnet ist, der eine nach vorne gerichtete Schneidkante (44) aufweist, die sich quer zu der Ebene erstreckt, mit einer gewählten Stärke (47), wie sie normal zur Ebene des Grundkörperabschnitts bemessen ist und die mit einer sich über dem Grundkörperabschnitt gewählten Überhöhung angeordnet ist, und
    einen tiefer bemessenen Abschnitt (46) auf dem vorderen Bereich des Grundkörperabschnitts, wobei der tiefer bemessene Abschnitt einen plattenförmigen Abschnitt (48) umfaßt, der in einem im wesentlichen rechten Winkel in bezug zur Ebene des Grundkörperabschnitts gebogen verläuft, und der eine obere Fläche (48a) aufweist, die von einer rückwärts gerichteten, hinteren Kante (56) des plattenförmigen Abschnitts, welche in einer benachbart zur Höhe der Schneidkante, jedoch unterhalb, angeordnet ist, und nach hinten geneigt ist zu einer nach vorne gerichteten, vorderen Kante (68) des plattenförmigen Abschnitts, welche in einer niedrigeren Höhe angeordnet ist, dadurch gekennzeichnet, dass der tiefer bemessene Abschnitt einen maximal ausgebildeten Bereich aufweist, mit einer zur Ebene des Grundkörperabschnittes normal bemessenen Breite (71), welche wenigstens so groß ist wie die Breite (47) der Schneidkante.
EP99108138A 1994-11-14 1995-11-14 Sägekettenschneidglied mit abgewinkelten Schneidtiefenbegrenzer Expired - Lifetime EP0933176B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US338334 1994-11-14
US08/338,334 US5599011A (en) 1993-07-26 1994-11-14 Sheet feeder
EP95850202A EP0712700B1 (de) 1994-11-14 1995-11-14 Sägekettenschneidglied mit abgewinkeltem Schneidtiefenbegrenzer

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP95850202A Division EP0712700B1 (de) 1994-11-14 1995-11-14 Sägekettenschneidglied mit abgewinkeltem Schneidtiefenbegrenzer
EP95850202A Division-Into EP0712700B1 (de) 1994-11-14 1995-11-14 Sägekettenschneidglied mit abgewinkeltem Schneidtiefenbegrenzer

Publications (3)

Publication Number Publication Date
EP0933176A2 EP0933176A2 (de) 1999-08-04
EP0933176A3 EP0933176A3 (de) 1999-10-27
EP0933176B1 true EP0933176B1 (de) 2002-01-16

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EP99108138A Expired - Lifetime EP0933176B1 (de) 1994-11-14 1995-11-14 Sägekettenschneidglied mit abgewinkelten Schneidtiefenbegrenzer

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DE (1) DE69525076T2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009007187A1 (de) 2009-02-03 2010-08-05 Protool Gmbh Sägekette und damit ausgestattete Kettensäge

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4604932A (en) * 1983-10-24 1986-08-12 Omark Industries, Inc. Safety chain for chain saws
DE3539334A1 (de) * 1985-11-06 1987-05-07 Stihl Maschf Andreas Saegekette

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Publication number Publication date
DE69525076T2 (de) 2002-10-31
EP0933176A2 (de) 1999-08-04
DE69525076D1 (de) 2002-02-21
EP0933176A3 (de) 1999-10-27

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