CA1119078A - Saw chain - Google Patents
Saw chainInfo
- Publication number
- CA1119078A CA1119078A CA000350259A CA350259A CA1119078A CA 1119078 A CA1119078 A CA 1119078A CA 000350259 A CA000350259 A CA 000350259A CA 350259 A CA350259 A CA 350259A CA 1119078 A CA1119078 A CA 1119078A
- Authority
- CA
- Canada
- Prior art keywords
- plate portion
- cutting edge
- side plate
- top plate
- cutter
- 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
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
- B27B33/142—Cutter elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D63/00—Dressing the tools of sawing machines or sawing devices for use in cutting any kind of material, e.g. in the manufacture of sawing tools
- B23D63/08—Sharpening the cutting edges of saw teeth
- B23D63/16—Sharpening the cutting edges of saw teeth of chain saws
- B23D63/166—Sharpening the cutting edges of saw teeth of chain saws without removal of the saw chain from the guide bar
- B23D63/168—Sharpening the cutting edges of saw teeth of chain saws without removal of the saw chain from the guide bar the saw chain moving around the guide bar
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Sawing (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A completely outside sharpenable saw chain of the chisel type has top plate portions sharpened on their tops and side cutter portions sharpened on their outer sides. The chain has allochiral cutter teeth each having a top plate portion sloping rearwardly and downwardly and joined along one side edge to a side slitter plate portion sloping rearwardly and inwardly, a bent over shank portion, a body portion and a depth gauge portion, the top plate portion, the side slitter plate portion and the shank portion being generally C-shaped. The top plate portion has at its top a sharpening surface forming a top cutting edge which joins a corner chisel point from which extends downward-ly and rearwardly a side slitting edge formed by a side plate sharpening sur-face lying in a plane parallel to the centerline of the saw chain. The bottom face of the top plate portion and the inner face of the side slitter plate por-tion each has a layer of chromium thereon.
A completely outside sharpenable saw chain of the chisel type has top plate portions sharpened on their tops and side cutter portions sharpened on their outer sides. The chain has allochiral cutter teeth each having a top plate portion sloping rearwardly and downwardly and joined along one side edge to a side slitter plate portion sloping rearwardly and inwardly, a bent over shank portion, a body portion and a depth gauge portion, the top plate portion, the side slitter plate portion and the shank portion being generally C-shaped. The top plate portion has at its top a sharpening surface forming a top cutting edge which joins a corner chisel point from which extends downward-ly and rearwardly a side slitting edge formed by a side plate sharpening sur-face lying in a plane parallel to the centerline of the saw chain. The bottom face of the top plate portion and the inner face of the side slitter plate por-tion each has a layer of chromium thereon.
Description
~lgO~8 Saw chains having chisel-type cutter links, that is, cutter links in which the top plate portion and the side slitter portion form a sharp angle, and, therefore, a sharp corner at the juncture of the top cutting edge and the side cutting edge, are very eEfective. However, they require expertise in sharpening, and are not nearly so widely used as saw chains of the chipper-type, which have a rounded corner formed by the top cutting edge and the side cutting edge, the rounded corner being less adapted to slitting than the sharp corner of the chisel-type tooth but being sharpenable without the great skill required by the chisel tooth. In each of saw chains disclosed in Silvon United States Patents 3,263,717 and 3,469,610, Oehrli United States Patent 3,260,287 and Frederickson United States Patent 3,189,064, there is disclosed a tooth adapted to have its top cutting edge sharpened uniformly with little skill required, but the side slitter edges must be hand filed and this tooth does not present an easily maintained sharp corner. Neumeier United States Patent 3,581,785 also shows top cutting teeth which can be sharpened easily but have no side slitter portions. Dolata et al United States Patents 3,921,490 and 4,023,453 disclose a saw chain having a twisted tooth which can be top sharpened and a side slitter which can be sharpened at the outside edge. However, both the top edge and the side slitting edge must include such large angles that they are not good cutters and do not have sharp corners. Also, the teeth break off easily.
An object of the invention is to provide a chisel-type saw chain that can be completely sharpened outside, is easily sharpened, has a long life and is very efficient in sawing. The saw chain is sharpenable only exteriorly on its top and one side.
Summary of the Invention The invention provides in a saw chain movable along an endless path in a predetermined direction, said saw chain having a centerline, a completely outside sharpenable cutter comprising, a flat body por-1~190'78 tion having opposite side surfaces extending parallel to said centerl.ine, a side plate portion positioned to one side of said centerline, said side plate portion havi.ng an outer side surface, and an inside surface parallel to said outer side surface, and a flat, outer side sharpened surface extending from front to rear in parallel relation to said centerline and intersecting said outer side surface, said side plate outer side surface and inside surface extending rear-wardly and inwardly at an acute angle from said side sharpened surface whereby said side sharpened surface is outermost on said side plate portion, said inside surface intersecting said outer side sharpened surface to define an outermost, forward, side cutting edge, the top plate portion integral with the side plate portion and extending from the side plate portion across said centerline, the top plate portion having a top sharpened surface, a bottom surface, and a top cutting edge formed by the bottom surface of the top plate portion intersecting said top sharpened surface, said top plate portion extending rearwardly and downwardly at an acute angle toward said body portion from said top cutting edge and said top sharpened surface, the top cutting edge and the side cutting edge intersecting at a point, and an offsetting shank portion joining the body portion and the side plate portion.
The invention also provides a saw chain tooth comprising:
a flat body portion having a longitudinal centerline, a side plate portion, a shank portion joining the body portion and the side plate portion, the side plate portion extending rearwardly at an acute angle relative to the ~lg~
body portion and have parallel inner and outer surfaces, and a top plate portion joined at one side edge to the side plate portion, said top plate portion having an inner surface and a forward end portion, the side plate portion having a planar outer side sharpened surface, said outer side sharpened surface being parallel to the body portion centerline, said inner surface angularly intersecting said sharpened surface to form a side cutting edge, the top plate portion having a top sharpened surface at said forward end portion forming a top cutting edge with the inner surface of the top plate portion, the top cutting edge and the side cutting edge intersecting at an outermost point.
Brief DescriPtion of the Drawings Figures 1 and la are perspective views of an improved chisel-type cutter link forming one embodiment of the invention;
Figure 2 is a side elevation view of the cutter link of Figure l;
Figure 3 is a rear view of the cutter link of Figure 1 taken along line 3-3 of Figure 2;
Figure 4 is an enlarged, vertical, sectional view taken along line 4-4 of Figure 2;
Figure 5 is a top plan view taken along line 5-5 of Figure 2;
Figure 6 is a side elevation view taken along line 6-6 of Figure 5;
Figure 7 is a fragmentary, side elevation view of an improved chisel-type saw chain forming one embodiment of the invention and including the link of Figure 1 and showing a sequence and a half of the saw chain;
-2a-~190 78 Figure 8 is a fragmentary, top plan view of the saw chain of Pigure 7;
Figures 9-12 are perspective views of the several stages of making a cutter link like that of Figure 1 but of the opposite hand;
Figure 13 is a perspective view of a chain saw with the saw chain of Figure 7 and with a sharpening attachment mounted on a saw bar thereof;
Figure 14 is a fragmentary, side elevation view of the chain saw and sharpening attachment of Figure 13; and, Figure 15 is a bottom p]an view taken along line 15-15 of Figure 14.
A completely outside sharpenable saw chain 10 (Figures 7 and 8) has novel top and side sharpenable chisel-type cutter links or teeth 11 and 12, each forming one specific embodiment of the invention. The links 11 are identical to the links 12 except that the links 11 are righthand and the links 12 are left-hand, i.e. allochiral, and, hence, only the links 11 will be described in detail.
Each link 11 ~Figures 1-6) has a flat hody portion 14, a depth gauge portion 16, an offsetting shank portion 18, a rearwardly, inwardly and somewha~ downwardly sloping generally flat or slightly rounded side plats portion 20 joined to the shank or offse* portion 18 by a rounded, bent portion 22 and a rezrwardly and downwardly sloping, flat, top plate portion 24 joined along one side edge thereof to the top edge of the side plate portion 20 by an angular or rounded, bent por-tion 26. The shank portion is joined to the body portion 14 by a rounded, bent portion 30. The body portion has holes 32 and 34 for rivets. Throughout this description and the claims, for purposes of clarity in describing the cutter linke 11 and 12, it will be assumed that the body portions are in upright posi-tions with the top plates uppermost. Also, "inwardly" means toward the longi-tudinal center plane of the chain and "outwardly" means laterally away from that plane.
Each link 11 (and 12) has a sharp point 40 formed at the junction of a 0`~8 top sharpening surface 42, an outer, planar side sharpening surface 46 and an inner surface 48, preferably chrome, of the angular portion 26. An inner or bottom surface 44 of the top plate portion 24 is chromium plated and forms a sharp, rearwardly and inwardly extending top cutting edge 50 extending inwardly and somewhat rearwardly from the point 40. An inner surface or side 52 of the side plate portion 20 also preferably is chromium plated and forms a kerf side cutting edge 54, which extends somewhat downwardly and preferably somewhat rear-wardly from the point 40 so that it is hook-like.
The cutting edges 50 are preferably sharpened by power~ as for example, by an arcuate abrasive member 60 (Figures 13-15) of a sharpening attachment 63 on a chain saw 62, when the member 60 is pressed toward a nose portion 64 of a saw bar 65 of the chain saw to always engage at least two of the top surfaces 42 as the chain is driven by a sprocket (not shown) of the saw. Simultaneously, the member 60 also abrades top surfaces 67 of the depth gauge portions to reduce their height proportionately to the reduction of the height of the cutters by the sharpening. Rear end 68 (Figure 2) of each depth gauge portion is the gauging portion thereof and is positioned substantially farther forwardly of the midpoint of an imaginary line 70 joining the centers of rivet holes 32 and 34 in the body portion than is the top cutting edge 50 to the rear of that midpoint.
As a result, the rear end 68 of each depth gauge portion is always a selected distance lower than the cutting edge 50. The forward slope of rear edge 76 of the depth gauge portion 16 and the rearward slope of the bottom surface 52 of the top plate portion are such that the height differential between the rear end 68 and the cutting edge 50 is kept constant even after repeated sharpenings.
Preferably, the downward slope of the top plate portion 24 is such that the in-cluded angle of the cutting edge is from about 30 to about 40. The top plate portion 24 slopes somewhat upwardly proceeding inwardly from the bent portion 6~ ~8 26, to an extent such that the edge 50 forms an angle of about 22 with a line 79 (Figure 5) normal to the plane of the body portion.
The kerf side cutting edges 54 of the side plate portions 20 of the links 11 and 12 are sharpened by pressing planar abrasive members 80 and 81 (Figures 13-15) against the sides of the saw chain 10 as the chain is driven by the chain saw to abrade the side sharpening surfaces 46 (Figures 1-6). The sharpening faces of the members 80 and 81 may be kept parallel to the body por-tions 14 of the cutter links 11 and ]2 or, to increace the hooking configuration of the side cutting edges 54 and to provide some kerf side wall clearance, may be tilted, preferably about 4, somewhat inwardly proceeding upwardly. This also gives clearance behind the cutting edge 54. The surfaces 46 are, of course, planar. The inward slope of the side plate portions 20 is preferab]y such that the acuteness of the side cutting edges 54 is between 30 and 40. This slope also permits many sharpenings of the side cutting edges without weakening side plate portions.
A preferred method of making the links 11 and 12 is to cut a blank 90 (Figure 9) of sheet steel in soft condition, saw chain steel of about 0.043 inches thickness being one very satisfactory material, then stretch forming an upper portion 91 (Figure 10) about a vertical axis 92 at back edge portion 93 to form the offset shank portion 18. Then, with a wiping and slight coining action, the upper portion 91 is bent at bent portion 26. This completes the shaping of the link and it is then heat tre~ted to harden it to a Rockwell hardness of from about 50 to about 65 on the Rockwell Scale C, it being feasible to make the teeth even as hard as the 65, since filing is not required to sharpen the cutting edges 50 and 54.
After the hardening of the links 11 and 12, bottom face 48 of the top plate portion 24 and the inside face 52 of the side plate portion 20 are prefer-1~90'~'~
ably plated with chromium, to provide very hard, wear resistant material for the cutting edges 50 and 54. Also, during use of these cutter links, the hard chro-mium surface is pressed by the wood being cut against the top plate portion 24 and the side plate portion 20 so that there is no tendency to peel off the chro-mium plating.
The top plate portion, proceeding from the bent portion 26 at its outer edge, is tilted up somewhat so that the abrasion of the sharpening surface 52 which lies in a portion of a cylinder, centered on an axis norma] to the body portion 14 causes the cutting edge 50 to extend somewhat rearwardly proceeding from the corner or point 40. This gives the cutting edge a slicing as well as a chiseling action.
To provide the hook shape of the side cutting edge 54~ the side plate portion 20 tilts out of a vertical plane proceeding downwardly from the upper bent portion 26 to the lower bent portion 22. Then, when the side sharpening surface 46 is ground in a vertical plane, the side cutting edge 54 slopes some-what rearwardly, proceeding downwardly therealong. This slope or hook is in-creased if the sharpening member is tilted inwardly at its lower end.
It will be understood that the chain 10 is endless and that only a seg-ment, one and one-half sequences, is shown in Figure 7. The chain 10 includes driving links 110 connected by rivets 111 to the body portions 14 of the cutter links 11 and 12 and side links 112 and also connected to bumper links 113 posi-tioned between the cutter links. Each top plate portion 24 extends over the centerline of the chain so that the top plate portions 24 of the links 11 and 12 overlap.
The bent edge portion 26 at the juncture of the side plate portion 20 and the top plate portion 24 so extends inwardly and downwardly that, as the top sharpening surface 42 and the side sharpening surface 46 are sharpened substan-0 ~ 8 tially equally, the point 40 is maintained substantially at the center of the bent edge portion 48 The bent edge portions 22 and 26 extend in somewhat con-verging directions, proceeding rearwardly therealong so that the side plate por-tion narrows somewhat from front to rear. The side plate portion 20 while shown as substantially planar may instead by somewhat rounded.
The cutter link 11 of a constructed saw chain which operated very suc-cessfully is shown with its geometry in Figures 1-6, the angle of the side plate portion 20 to the body portion 14 proceeding rearwardly, being 30, the side plate portion tilting inwardly proceeding upwardly at an angle of about lQ to the vertical, the angle of the top cutting edge 50 to a line normal to the body portion being 22, the angle of the top plate portion to the body portion being 111, the shank portion being sloped at an angle of about 45 to the body por-tion 14, the angle of the side cutting edge 54 to the vertical being about 22, the thickness of the chromium plating on the lower face of the top plated portion and the inner face of the side plate portion being about 0.0004 inches, the link being hardened to a hardness of about 56 on the Rockwell C scale, and the side sharpening surface 46 - being in a vertical plane parallel to the body portion 14. A sloping forward corner portion 99 was provided on the depth gauge 16 to lessen the abrupt interference with wood being cut, particularly in boring.
The top plate portion 24, the side plate portion 20 and the shank portion 18, in transverse cross-section, are combined, concave and roughly in the form of a "C" which may vary from a substantially uniform curvature ~o highly angled at the bent portions.
An object of the invention is to provide a chisel-type saw chain that can be completely sharpened outside, is easily sharpened, has a long life and is very efficient in sawing. The saw chain is sharpenable only exteriorly on its top and one side.
Summary of the Invention The invention provides in a saw chain movable along an endless path in a predetermined direction, said saw chain having a centerline, a completely outside sharpenable cutter comprising, a flat body por-1~190'78 tion having opposite side surfaces extending parallel to said centerl.ine, a side plate portion positioned to one side of said centerline, said side plate portion havi.ng an outer side surface, and an inside surface parallel to said outer side surface, and a flat, outer side sharpened surface extending from front to rear in parallel relation to said centerline and intersecting said outer side surface, said side plate outer side surface and inside surface extending rear-wardly and inwardly at an acute angle from said side sharpened surface whereby said side sharpened surface is outermost on said side plate portion, said inside surface intersecting said outer side sharpened surface to define an outermost, forward, side cutting edge, the top plate portion integral with the side plate portion and extending from the side plate portion across said centerline, the top plate portion having a top sharpened surface, a bottom surface, and a top cutting edge formed by the bottom surface of the top plate portion intersecting said top sharpened surface, said top plate portion extending rearwardly and downwardly at an acute angle toward said body portion from said top cutting edge and said top sharpened surface, the top cutting edge and the side cutting edge intersecting at a point, and an offsetting shank portion joining the body portion and the side plate portion.
The invention also provides a saw chain tooth comprising:
a flat body portion having a longitudinal centerline, a side plate portion, a shank portion joining the body portion and the side plate portion, the side plate portion extending rearwardly at an acute angle relative to the ~lg~
body portion and have parallel inner and outer surfaces, and a top plate portion joined at one side edge to the side plate portion, said top plate portion having an inner surface and a forward end portion, the side plate portion having a planar outer side sharpened surface, said outer side sharpened surface being parallel to the body portion centerline, said inner surface angularly intersecting said sharpened surface to form a side cutting edge, the top plate portion having a top sharpened surface at said forward end portion forming a top cutting edge with the inner surface of the top plate portion, the top cutting edge and the side cutting edge intersecting at an outermost point.
Brief DescriPtion of the Drawings Figures 1 and la are perspective views of an improved chisel-type cutter link forming one embodiment of the invention;
Figure 2 is a side elevation view of the cutter link of Figure l;
Figure 3 is a rear view of the cutter link of Figure 1 taken along line 3-3 of Figure 2;
Figure 4 is an enlarged, vertical, sectional view taken along line 4-4 of Figure 2;
Figure 5 is a top plan view taken along line 5-5 of Figure 2;
Figure 6 is a side elevation view taken along line 6-6 of Figure 5;
Figure 7 is a fragmentary, side elevation view of an improved chisel-type saw chain forming one embodiment of the invention and including the link of Figure 1 and showing a sequence and a half of the saw chain;
-2a-~190 78 Figure 8 is a fragmentary, top plan view of the saw chain of Pigure 7;
Figures 9-12 are perspective views of the several stages of making a cutter link like that of Figure 1 but of the opposite hand;
Figure 13 is a perspective view of a chain saw with the saw chain of Figure 7 and with a sharpening attachment mounted on a saw bar thereof;
Figure 14 is a fragmentary, side elevation view of the chain saw and sharpening attachment of Figure 13; and, Figure 15 is a bottom p]an view taken along line 15-15 of Figure 14.
A completely outside sharpenable saw chain 10 (Figures 7 and 8) has novel top and side sharpenable chisel-type cutter links or teeth 11 and 12, each forming one specific embodiment of the invention. The links 11 are identical to the links 12 except that the links 11 are righthand and the links 12 are left-hand, i.e. allochiral, and, hence, only the links 11 will be described in detail.
Each link 11 ~Figures 1-6) has a flat hody portion 14, a depth gauge portion 16, an offsetting shank portion 18, a rearwardly, inwardly and somewha~ downwardly sloping generally flat or slightly rounded side plats portion 20 joined to the shank or offse* portion 18 by a rounded, bent portion 22 and a rezrwardly and downwardly sloping, flat, top plate portion 24 joined along one side edge thereof to the top edge of the side plate portion 20 by an angular or rounded, bent por-tion 26. The shank portion is joined to the body portion 14 by a rounded, bent portion 30. The body portion has holes 32 and 34 for rivets. Throughout this description and the claims, for purposes of clarity in describing the cutter linke 11 and 12, it will be assumed that the body portions are in upright posi-tions with the top plates uppermost. Also, "inwardly" means toward the longi-tudinal center plane of the chain and "outwardly" means laterally away from that plane.
Each link 11 (and 12) has a sharp point 40 formed at the junction of a 0`~8 top sharpening surface 42, an outer, planar side sharpening surface 46 and an inner surface 48, preferably chrome, of the angular portion 26. An inner or bottom surface 44 of the top plate portion 24 is chromium plated and forms a sharp, rearwardly and inwardly extending top cutting edge 50 extending inwardly and somewhat rearwardly from the point 40. An inner surface or side 52 of the side plate portion 20 also preferably is chromium plated and forms a kerf side cutting edge 54, which extends somewhat downwardly and preferably somewhat rear-wardly from the point 40 so that it is hook-like.
The cutting edges 50 are preferably sharpened by power~ as for example, by an arcuate abrasive member 60 (Figures 13-15) of a sharpening attachment 63 on a chain saw 62, when the member 60 is pressed toward a nose portion 64 of a saw bar 65 of the chain saw to always engage at least two of the top surfaces 42 as the chain is driven by a sprocket (not shown) of the saw. Simultaneously, the member 60 also abrades top surfaces 67 of the depth gauge portions to reduce their height proportionately to the reduction of the height of the cutters by the sharpening. Rear end 68 (Figure 2) of each depth gauge portion is the gauging portion thereof and is positioned substantially farther forwardly of the midpoint of an imaginary line 70 joining the centers of rivet holes 32 and 34 in the body portion than is the top cutting edge 50 to the rear of that midpoint.
As a result, the rear end 68 of each depth gauge portion is always a selected distance lower than the cutting edge 50. The forward slope of rear edge 76 of the depth gauge portion 16 and the rearward slope of the bottom surface 52 of the top plate portion are such that the height differential between the rear end 68 and the cutting edge 50 is kept constant even after repeated sharpenings.
Preferably, the downward slope of the top plate portion 24 is such that the in-cluded angle of the cutting edge is from about 30 to about 40. The top plate portion 24 slopes somewhat upwardly proceeding inwardly from the bent portion 6~ ~8 26, to an extent such that the edge 50 forms an angle of about 22 with a line 79 (Figure 5) normal to the plane of the body portion.
The kerf side cutting edges 54 of the side plate portions 20 of the links 11 and 12 are sharpened by pressing planar abrasive members 80 and 81 (Figures 13-15) against the sides of the saw chain 10 as the chain is driven by the chain saw to abrade the side sharpening surfaces 46 (Figures 1-6). The sharpening faces of the members 80 and 81 may be kept parallel to the body por-tions 14 of the cutter links 11 and ]2 or, to increace the hooking configuration of the side cutting edges 54 and to provide some kerf side wall clearance, may be tilted, preferably about 4, somewhat inwardly proceeding upwardly. This also gives clearance behind the cutting edge 54. The surfaces 46 are, of course, planar. The inward slope of the side plate portions 20 is preferab]y such that the acuteness of the side cutting edges 54 is between 30 and 40. This slope also permits many sharpenings of the side cutting edges without weakening side plate portions.
A preferred method of making the links 11 and 12 is to cut a blank 90 (Figure 9) of sheet steel in soft condition, saw chain steel of about 0.043 inches thickness being one very satisfactory material, then stretch forming an upper portion 91 (Figure 10) about a vertical axis 92 at back edge portion 93 to form the offset shank portion 18. Then, with a wiping and slight coining action, the upper portion 91 is bent at bent portion 26. This completes the shaping of the link and it is then heat tre~ted to harden it to a Rockwell hardness of from about 50 to about 65 on the Rockwell Scale C, it being feasible to make the teeth even as hard as the 65, since filing is not required to sharpen the cutting edges 50 and 54.
After the hardening of the links 11 and 12, bottom face 48 of the top plate portion 24 and the inside face 52 of the side plate portion 20 are prefer-1~90'~'~
ably plated with chromium, to provide very hard, wear resistant material for the cutting edges 50 and 54. Also, during use of these cutter links, the hard chro-mium surface is pressed by the wood being cut against the top plate portion 24 and the side plate portion 20 so that there is no tendency to peel off the chro-mium plating.
The top plate portion, proceeding from the bent portion 26 at its outer edge, is tilted up somewhat so that the abrasion of the sharpening surface 52 which lies in a portion of a cylinder, centered on an axis norma] to the body portion 14 causes the cutting edge 50 to extend somewhat rearwardly proceeding from the corner or point 40. This gives the cutting edge a slicing as well as a chiseling action.
To provide the hook shape of the side cutting edge 54~ the side plate portion 20 tilts out of a vertical plane proceeding downwardly from the upper bent portion 26 to the lower bent portion 22. Then, when the side sharpening surface 46 is ground in a vertical plane, the side cutting edge 54 slopes some-what rearwardly, proceeding downwardly therealong. This slope or hook is in-creased if the sharpening member is tilted inwardly at its lower end.
It will be understood that the chain 10 is endless and that only a seg-ment, one and one-half sequences, is shown in Figure 7. The chain 10 includes driving links 110 connected by rivets 111 to the body portions 14 of the cutter links 11 and 12 and side links 112 and also connected to bumper links 113 posi-tioned between the cutter links. Each top plate portion 24 extends over the centerline of the chain so that the top plate portions 24 of the links 11 and 12 overlap.
The bent edge portion 26 at the juncture of the side plate portion 20 and the top plate portion 24 so extends inwardly and downwardly that, as the top sharpening surface 42 and the side sharpening surface 46 are sharpened substan-0 ~ 8 tially equally, the point 40 is maintained substantially at the center of the bent edge portion 48 The bent edge portions 22 and 26 extend in somewhat con-verging directions, proceeding rearwardly therealong so that the side plate por-tion narrows somewhat from front to rear. The side plate portion 20 while shown as substantially planar may instead by somewhat rounded.
The cutter link 11 of a constructed saw chain which operated very suc-cessfully is shown with its geometry in Figures 1-6, the angle of the side plate portion 20 to the body portion 14 proceeding rearwardly, being 30, the side plate portion tilting inwardly proceeding upwardly at an angle of about lQ to the vertical, the angle of the top cutting edge 50 to a line normal to the body portion being 22, the angle of the top plate portion to the body portion being 111, the shank portion being sloped at an angle of about 45 to the body por-tion 14, the angle of the side cutting edge 54 to the vertical being about 22, the thickness of the chromium plating on the lower face of the top plated portion and the inner face of the side plate portion being about 0.0004 inches, the link being hardened to a hardness of about 56 on the Rockwell C scale, and the side sharpening surface 46 - being in a vertical plane parallel to the body portion 14. A sloping forward corner portion 99 was provided on the depth gauge 16 to lessen the abrupt interference with wood being cut, particularly in boring.
The top plate portion 24, the side plate portion 20 and the shank portion 18, in transverse cross-section, are combined, concave and roughly in the form of a "C" which may vary from a substantially uniform curvature ~o highly angled at the bent portions.
Claims (14)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a saw chain movable along an endless path in a predetermined direction, said saw chain having a centerline, a completely outside sharpenable cutter com-prising, a flat body portion having opposite side surfaces extending parallel to said centerline, a side plate portion positioned to one side of said centerline, said side plate portion having an outer side surface, and an inside surface parallel to said outer side surface, and a flat, outer side sharpened surface extending from front to rear in parallel relation to said centerline and intersecting said outer side surface, said side plate outer side surface and inside surface extending rearwardly and inwardly at an acute angle from said side sharpened surface whereby said side sharpened surface is outermost on said side plate portion, said inside surface intersecting said outer side sharpened surface to define an outermost, forward, side cutting edge, the top plate portion integral with the side plate portion and extending from the side plate portion across said centerline, the top plate portion having a top sharpened surface, a bottom surface, and a top cutting edge formed by the bottom surface of the top plate portion intersecting said top sharpened surface, said top plate portion extending rearwardly and downwardly at an acute angle toward said body portion from said top cutting edge and said top sharpened surface, the top cutting edge and the side cutting edge intersecting at a point, and an offsetting shank portion joining the body portion and the side plate portion.
2. The cutter of claim 1 wherein the top plate portion and the side plate portion are of a predetermined hardness and the bottom surface of the top plate portion and the inside surface of the side plate portion are harder than said hardness.
3. The cutter of claim 1 wherein the side plate portion is substantially planar.
4. The cutter of claim 1 wherein the side cutting edge extends downwardly and rearwardly.
5. The cutter of claim 4 wherein the side plate portion extends upwardly and somewhat inwardly from the shank portion.
6. The cutter of claim 4 wherein the side sharpened surface extends somewhat inwardly proceeding downwardly therealong.
7. The cutter of claim 4 wherein the side cutting edge forms an angle of between about 0° and about 25° with the vertical.
8. The cutter of claim 7 wherein said angle is about 22°.
9. The cutter of claim 8 wherein the top plate portion forms an angle of about 35° to the horizontal.
10. The cutter of claim 7 wherein the top plate portion forms an angle between about 30° and 40° to the horizontal.
11. A saw chain tooth comprising:
a flat body portion having a longitudinal centerline, a side plate portion, a shank portion joining the body portion and the side plate portion, the side plate portion extending rearwardly at an acute angle relative to the body portion and have parallel inner and outer surfaces, and a top plate portion joined at one side edge to the side plate portion, said top plate portion having an inner surface and a forward end portion, the side plate portion having a planar outer side sharpened surface, said outer side sharpened surface being parallel to the body portion centerline, said inner surface angularly intersecting said sharpened surface to form a side cutting edge, the top plate portion having a top sharpened surface at said forward end portion forming a top cutting edge with the inner surface of the top plate portion, the top cutting edge and the side cutting edge intersecting at an outermost point.
a flat body portion having a longitudinal centerline, a side plate portion, a shank portion joining the body portion and the side plate portion, the side plate portion extending rearwardly at an acute angle relative to the body portion and have parallel inner and outer surfaces, and a top plate portion joined at one side edge to the side plate portion, said top plate portion having an inner surface and a forward end portion, the side plate portion having a planar outer side sharpened surface, said outer side sharpened surface being parallel to the body portion centerline, said inner surface angularly intersecting said sharpened surface to form a side cutting edge, the top plate portion having a top sharpened surface at said forward end portion forming a top cutting edge with the inner surface of the top plate portion, the top cutting edge and the side cutting edge intersecting at an outermost point.
12. The tooth of claim 11 wherein the side plate portion forms an angle of about 30° with the plane of the body portion.
13. The tooth of claim 11 or 12 wherein the side plate portion is tilted inwardly proceeding upwardly therealong.
14. The tooth of claim 11 wherein the side sharpened surface extends somewhat inwardly proceeding downwardly there-along.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US3684279A | 1979-05-07 | 1979-05-07 | |
| US036,842 | 1979-05-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1119078A true CA1119078A (en) | 1982-03-02 |
Family
ID=21890959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000350259A Expired CA1119078A (en) | 1979-05-07 | 1980-04-21 | Saw chain |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS55152001A (en) |
| BR (1) | BR8002735A (en) |
| CA (1) | CA1119078A (en) |
| CH (1) | CH638130A5 (en) |
| DE (3) | DE8012451U1 (en) |
| SE (1) | SE445191B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2529494B1 (en) * | 1982-06-30 | 1988-10-14 | Omark Industries Inc | METHOD AND APPARATUS FOR SHARPENING IMPROVED SAW CHAINS |
| DE3320465A1 (en) * | 1983-06-07 | 1984-12-13 | Fa. Andreas Stihl, 7050 Waiblingen | MOTOR CHAIN SAW |
| DE102006054022B4 (en) * | 2006-11-16 | 2012-05-24 | Xaver Mayer | Saw chain for motor chain saw |
| SE540277C2 (en) | 2016-09-06 | 2018-05-22 | Husqvarna Ab | Chainsaw chain and / or bar with coatings having specific properties |
| SE543444C2 (en) * | 2019-04-24 | 2021-02-16 | 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 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3260287A (en) * | 1962-05-17 | 1966-07-12 | Textron Inc | Chain saw with saw chain sharpener |
| US3189064A (en) * | 1962-10-15 | 1965-06-15 | Mcculloch Corp | Saw chain |
| US3581785A (en) * | 1963-07-22 | 1971-06-01 | Omark Industries Inc | Top sharpening cutter link for saw chain |
| US3263717A (en) * | 1963-09-23 | 1966-08-02 | Omark Industries Inc | Top sharpening saw chain |
| US3469610A (en) * | 1966-10-21 | 1969-09-30 | Omark Industries Inc | Top sharpenable saw chain |
| US3487591A (en) * | 1967-11-24 | 1970-01-06 | Omark Industries Inc | Crank operated saw chain sharpener |
| DE2302779C2 (en) * | 1973-01-20 | 1983-01-05 | Fa. Andreas Stihl, 7050 Waiblingen | Saw chain for chainsaws |
| US4023453A (en) * | 1973-01-30 | 1977-05-17 | Andreas Stihl Maschinenfabrik | Saw chain for motor chain saws |
-
1980
- 1980-04-21 CA CA000350259A patent/CA1119078A/en not_active Expired
- 1980-05-05 BR BR8002735A patent/BR8002735A/en unknown
- 1980-05-06 CH CH352080A patent/CH638130A5/en not_active IP Right Cessation
- 1980-05-07 DE DE19808012451 patent/DE8012451U1/en not_active Expired
- 1980-05-07 JP JP6046880A patent/JPS55152001A/en active Granted
- 1980-05-07 DE DE19803017519 patent/DE3017519A1/en active Granted
- 1980-05-07 DE DE19808020042 patent/DE8020042U1/en not_active Expired
- 1980-05-07 SE SE8003434A patent/SE445191B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| SE8003434L (en) | 1980-11-08 |
| CH638130A5 (en) | 1983-09-15 |
| DE3017519C2 (en) | 1992-01-09 |
| JPH0143601B2 (en) | 1989-09-21 |
| JPS55152001A (en) | 1980-11-27 |
| DE8020042U1 (en) | 1980-11-20 |
| BR8002735A (en) | 1980-12-16 |
| DE8012451U1 (en) | 1980-11-20 |
| SE445191B (en) | 1986-06-09 |
| DE3017519A1 (en) | 1980-11-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |