CA2208464C - Improved saw tooth - Google Patents
Improved saw toothInfo
- Publication number
- CA2208464C CA2208464C CA 2208464 CA2208464A CA2208464C CA 2208464 C CA2208464 C CA 2208464C CA 2208464 CA2208464 CA 2208464 CA 2208464 A CA2208464 A CA 2208464A CA 2208464 C CA2208464 C CA 2208464C
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- Canada
- Prior art keywords
- mounting
- sides
- tooth
- cutting edges
- saw tooth
- Prior art date
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- Expired - Lifetime
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Abstract
A saw tooth of generally parallelopiped shape having top and bottom surfaces, side surfaces and front and back surfaces. Each front and back surface has cutting edges at its top and bottom sides. The cutting edges on each surface are parallel to each other and are also parallel to the cutting edges on the other surface.
Description
IMPROVED SAW TOOTH
FIELD OF THE INVENTION
This invention is directed toward an improved saw tooth for circular saws.
The invention is also directed toward an improved saw tooth assembly using the improved saw tooth.
BACKGROUND ART
The improved saw tooth of the present invention is of the type used in circular saws, the circular saws being used in tree harvesting equipment. The saw tooth is also of the type that can be replaced on the blade of the circular saw when it becomes dull.
Replacing the saw teeth when they become dull can be expensive. To reduce the expense of replacing the teeth it is known to provide a saw tooth having several cutting edges. When one cutting edge becomes dull, the saw tooth is merely repositioned on the saw blade to present an unused cutting edge in the cutting position. Thus one tooth can be used two, or preferably four times, before it needs to be replaced. Thus the expense of replacing teeth is greatly reduced. Examples of such saw teeth, with multiple cutting edges, are shown in US Pat. 4,932,447, issued June 12, 1990, Armand J. Morin inventor; US Pat. 5,058,477, issued Oct. 22, 1991, Charles D. MacLennan inventor; and US Pat. 5,205,199, issued Apr. 27, 1993, Charles D. MacLennan inventor, by way of example.
The known cutting teeth with four cutting edges are relatively 1.
expensive however. They usually employ curved cutting edges, as shown in US Pats. 4,932,447 and 5,058,477, and thus their manufacture is relatively expensive. Even when the known teeth employ straight cutting edges, as shown in US Pat. 5,205,199, the tooth is still relatively expensive to manufacture since the surfaces of the tooth forming all the cutting edges are quite numerous and complex.
SUMMARY OF THE INVENTION
It is the purpose of the present invention to provide an improved cutting tooth of the type with four cutting edges which tooth is relatively simple in construction and relatively inexpensive to produce compared to the known cutting teeth. In accordance with the present invention, the improved cutting tooth is provided with straight cutting edges which are easier to produce compared to curved cutting teeth known in the prior art. In addition, the joining surfaces providing the cutting edges are fewer in number and simpler than the surfaces used in the prior art.
In accordance with the present invention the improved saw tooth is a block-like, or generally parallelopiped, member having two opposed surfaces with each end of each surface having a cutting edge. The cutting edges on each surface are parallel to each other and are also parallel to the cutting edges on the other surface.
The member has a central mounting hole extending between the surfaces, the axis of the hole transverse to the cutting edges.
FIELD OF THE INVENTION
This invention is directed toward an improved saw tooth for circular saws.
The invention is also directed toward an improved saw tooth assembly using the improved saw tooth.
BACKGROUND ART
The improved saw tooth of the present invention is of the type used in circular saws, the circular saws being used in tree harvesting equipment. The saw tooth is also of the type that can be replaced on the blade of the circular saw when it becomes dull.
Replacing the saw teeth when they become dull can be expensive. To reduce the expense of replacing the teeth it is known to provide a saw tooth having several cutting edges. When one cutting edge becomes dull, the saw tooth is merely repositioned on the saw blade to present an unused cutting edge in the cutting position. Thus one tooth can be used two, or preferably four times, before it needs to be replaced. Thus the expense of replacing teeth is greatly reduced. Examples of such saw teeth, with multiple cutting edges, are shown in US Pat. 4,932,447, issued June 12, 1990, Armand J. Morin inventor; US Pat. 5,058,477, issued Oct. 22, 1991, Charles D. MacLennan inventor; and US Pat. 5,205,199, issued Apr. 27, 1993, Charles D. MacLennan inventor, by way of example.
The known cutting teeth with four cutting edges are relatively 1.
expensive however. They usually employ curved cutting edges, as shown in US Pats. 4,932,447 and 5,058,477, and thus their manufacture is relatively expensive. Even when the known teeth employ straight cutting edges, as shown in US Pat. 5,205,199, the tooth is still relatively expensive to manufacture since the surfaces of the tooth forming all the cutting edges are quite numerous and complex.
SUMMARY OF THE INVENTION
It is the purpose of the present invention to provide an improved cutting tooth of the type with four cutting edges which tooth is relatively simple in construction and relatively inexpensive to produce compared to the known cutting teeth. In accordance with the present invention, the improved cutting tooth is provided with straight cutting edges which are easier to produce compared to curved cutting teeth known in the prior art. In addition, the joining surfaces providing the cutting edges are fewer in number and simpler than the surfaces used in the prior art.
In accordance with the present invention the improved saw tooth is a block-like, or generally parallelopiped, member having two opposed surfaces with each end of each surface having a cutting edge. The cutting edges on each surface are parallel to each other and are also parallel to the cutting edges on the other surface.
The member has a central mounting hole extending between the surfaces, the axis of the hole transverse to the cutting edges.
2.
The tooth is mounted on a mounting block on the rim of a circular saw blade by a bolt extending through the mounting hole in a manner to have one of the cutting edges on one of the surfaces in an outer, leading, cutting position. When this cutting edge becomes dull, the bolt is loosened; the tooth is rotated, relative to the mounting block, to place the other cutting edge on the same surface in the outer, leading cutting position; and the bolt is tightened.
When this second cutting edge becomes dull, the bolt is removed, the tooth is reversed to place a cutting edge on the other surface in the cutting position, and the bolt is replaced and tightened.
When the third edge becomes dull, the bolt is loosened, the tooth is rotated to place the other and last unused cutting edge on the other surface in the cutting position, and the bolt is tightened.
The invention is particularly directed toward a saw tooth having top and bottom surfaces; side surfaces; and front and back surfaces. Each front and back surface has cutting edges at their top and bottom sides, the cutting edges on each surface parallel to each other and also parallel to the cutting edges on the other surface.
The invention is also particularly directed toward a saw tooth assembly having; a saw tooth with top and bottom surfaces; side surfaces; and front and back surfaces. Each front and back surface has cutting edges at their top and bottom sides, the cutting edges on each surface parallel to each other and also parallel to the cutting edges on the other surface. The assembly includes a 3.
mounting block adapted to mounted on the rim of a circular saw blade. Cooperating mounting surfaces on the mounting block and on the front and back surfaces of the saw tooth locate any one of the four cutting edges in cutting position when the saw tooth is detachably mounted on the block. A bolt detachably connects the tooth to the block with the mounting surface on the block abutting one of the mounting surfaces on the front or back surfaces of the tooth.
BRIEF DESCRIPTION OF THE FIGURES IN THE DRAWINGS
Fig. 1 is an exploded perspective view of the saw tooth assembly;
Fig. 2 is a side view of the saw tooth assembly mounted on a saw blade;
Figs. 3A, 3B, and 3C are detail side views of the saw tooth assembly showing repositioning of the saw tooth on the mounting block to provide new cutting edges;
Fig. 4 is a cross-section view taken along line 4-4 in Fig. 1;
and Fig. 5 is a side view of another embodiment of the saw tooth.
DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INV~N'1'1ON
The saw tooth 1 of the present invention, as shown in Figs. 1 and 2, has a generally parallelopiped shape with opposed top and bottom surfaces 3, 5; side surfaces 7; and front and back surfaces 9, 11. The top and bottom surfaces 3, 5 are preferably parallel and the sides 7 are also preferably parallel. The terms "top" and 4.
"bottom" refer to the location of the surfaces relative to a saw blade that the tooth is mounted on, the surface closest to the saw blade being the "bottom" surface. The terms "front" and "back" also refer to the location of the surfaces relative to a saw blade that the tooth is mounted on, the surface facing in the direction of rotation being the "front" surface.
The front surface 9 has front, top and bottom sections 13, 15 that extend inwardly away from a plane 17 joining the front sides 19, 21 of the top and bottom surfaces 3, 5. The front, top and bottom sections 13, 15 of the front surface 9 are preferably angled inwardly at an angle B from the front plane 17 and are joined by a front, central section 23 that is transverse to the top and bottom surfaces 3, 5. Similarly, the back surface 11 has back, top and bottom sections 25, 27 that extend inwardly from a back plane 29 joining the back sides 31, 33 of the top and bottom surfaces 3, 5. The back, top and bottom sections 25, 27 of the back surface 11 are preferably angled inwardly at an angle B from the back plane 29 and are joined by a back, central section 35 that is transverse to the top and bottom surfaces 3, 5. The angle B is approximately 45~ but can vary between 20~ and 65~. If desired, a small radius (not shown) can be formed at the juncture of the front, top and bottom sections 13, 15 with the front, central section 23 and at the juncture of the back, top and bottom sections 25, 27 with the back central section 35 to reduce stress.
The joining of the front, top section 13 of the front 5.
surface 9 to the top surface 3, at its front side 19, forms a first cutting edge 41. The joining of the front, bottom section 15 of the front surface 9 to the bottom surface 5, at its front side 21, forms a second cutting edge 43. The first and second cutting edges 41, 43 on the front surface 9 are parallel to each other and transverse to the side surfaces 7.
The joining of the back, top section 25 of the back surface 11 to the top surface 3, at its back side 31, forms a third cutting edge 45. The joining of the back, bottom section 27 of the back surface 11 to the bottom surface 5, at its back side 33, forms a fourth cutting edge 47. The third and fourth cutting edges 45, 47 are parallel to each other and transverse to the side surfaces 7.
The third and fourth cutting edges 45, 47 are also parallel to the first and second cutting edges 41, 43.
The tooth 1 has a threaded, central, mounting hole 49 extending through the tooth between the central sections 23, 35 on the front and back surfaces 9, 11. The hole 49 is centrally located on the tooth between the top and bottom surfaces 3, 5 and is also centrally located between the side surfaces 7. The hole 49 extends transverse to the cutting edges 41, 43, 45, 47 and its center is equidistant from all of them.
The back, central section 35 on the back surface 11 of the tooth together with adjacent portions of the top and bottom sections 25, 27 on the back surface 11 form a first mounting 6.
surface S1 for the tooth as shown in Fig. 3C and as will be described. The front, central section 19 on the front surface 9 together with adjacent portions of the top and bottom sections 13, 15 on the front surface 9 form a second mounting surface 53 for the tooth as shown in Fig. 3A and as will be described.
The saw tooth 1 is adapted to be mounted on a mounting block 55 to form a saw tooth assembly 57. The mounting block 55, as shown in Figs. 1 and 2, has a top and a bottom surface 59, 61; side surfaces 63; and front and back surfaces 65, 67. The top and bottom surfaces 59, 61 converge slightly toward the back; the front and back surfaces 65, 67 are parallel; and the side surfaces 63 are also parallel. The front of the block 55 is under cut back from the front surface 65, as shown at 69, to produce a forwardly extending projection 71 having a bottom surface 73 that is parallel to the top surface 59.
The front of the projection 71 is beveled at the top and bottom as shown at 75, 77 at an angle ~. The distance "L" between the beveled surfaces 75, 77 on the front surface 65 of the projection 71 is equal to the distance "L" between the top and bottom sections 13, 15 or 25, 27 on the front or back surfaces 9, 11 of the tooth 1. The depth "d" of the projection 71 is slightly less than the depth "D" of the tooth between its top and bottom surfaces 3, 5. The front surface 65 together with the beveled surfaces 75, 77 form a saw tooth mounting surface 79 as shown in Fig. 3.
The tooth is mounted on a mounting block on the rim of a circular saw blade by a bolt extending through the mounting hole in a manner to have one of the cutting edges on one of the surfaces in an outer, leading, cutting position. When this cutting edge becomes dull, the bolt is loosened; the tooth is rotated, relative to the mounting block, to place the other cutting edge on the same surface in the outer, leading cutting position; and the bolt is tightened.
When this second cutting edge becomes dull, the bolt is removed, the tooth is reversed to place a cutting edge on the other surface in the cutting position, and the bolt is replaced and tightened.
When the third edge becomes dull, the bolt is loosened, the tooth is rotated to place the other and last unused cutting edge on the other surface in the cutting position, and the bolt is tightened.
The invention is particularly directed toward a saw tooth having top and bottom surfaces; side surfaces; and front and back surfaces. Each front and back surface has cutting edges at their top and bottom sides, the cutting edges on each surface parallel to each other and also parallel to the cutting edges on the other surface.
The invention is also particularly directed toward a saw tooth assembly having; a saw tooth with top and bottom surfaces; side surfaces; and front and back surfaces. Each front and back surface has cutting edges at their top and bottom sides, the cutting edges on each surface parallel to each other and also parallel to the cutting edges on the other surface. The assembly includes a 3.
mounting block adapted to mounted on the rim of a circular saw blade. Cooperating mounting surfaces on the mounting block and on the front and back surfaces of the saw tooth locate any one of the four cutting edges in cutting position when the saw tooth is detachably mounted on the block. A bolt detachably connects the tooth to the block with the mounting surface on the block abutting one of the mounting surfaces on the front or back surfaces of the tooth.
BRIEF DESCRIPTION OF THE FIGURES IN THE DRAWINGS
Fig. 1 is an exploded perspective view of the saw tooth assembly;
Fig. 2 is a side view of the saw tooth assembly mounted on a saw blade;
Figs. 3A, 3B, and 3C are detail side views of the saw tooth assembly showing repositioning of the saw tooth on the mounting block to provide new cutting edges;
Fig. 4 is a cross-section view taken along line 4-4 in Fig. 1;
and Fig. 5 is a side view of another embodiment of the saw tooth.
DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INV~N'1'1ON
The saw tooth 1 of the present invention, as shown in Figs. 1 and 2, has a generally parallelopiped shape with opposed top and bottom surfaces 3, 5; side surfaces 7; and front and back surfaces 9, 11. The top and bottom surfaces 3, 5 are preferably parallel and the sides 7 are also preferably parallel. The terms "top" and 4.
"bottom" refer to the location of the surfaces relative to a saw blade that the tooth is mounted on, the surface closest to the saw blade being the "bottom" surface. The terms "front" and "back" also refer to the location of the surfaces relative to a saw blade that the tooth is mounted on, the surface facing in the direction of rotation being the "front" surface.
The front surface 9 has front, top and bottom sections 13, 15 that extend inwardly away from a plane 17 joining the front sides 19, 21 of the top and bottom surfaces 3, 5. The front, top and bottom sections 13, 15 of the front surface 9 are preferably angled inwardly at an angle B from the front plane 17 and are joined by a front, central section 23 that is transverse to the top and bottom surfaces 3, 5. Similarly, the back surface 11 has back, top and bottom sections 25, 27 that extend inwardly from a back plane 29 joining the back sides 31, 33 of the top and bottom surfaces 3, 5. The back, top and bottom sections 25, 27 of the back surface 11 are preferably angled inwardly at an angle B from the back plane 29 and are joined by a back, central section 35 that is transverse to the top and bottom surfaces 3, 5. The angle B is approximately 45~ but can vary between 20~ and 65~. If desired, a small radius (not shown) can be formed at the juncture of the front, top and bottom sections 13, 15 with the front, central section 23 and at the juncture of the back, top and bottom sections 25, 27 with the back central section 35 to reduce stress.
The joining of the front, top section 13 of the front 5.
surface 9 to the top surface 3, at its front side 19, forms a first cutting edge 41. The joining of the front, bottom section 15 of the front surface 9 to the bottom surface 5, at its front side 21, forms a second cutting edge 43. The first and second cutting edges 41, 43 on the front surface 9 are parallel to each other and transverse to the side surfaces 7.
The joining of the back, top section 25 of the back surface 11 to the top surface 3, at its back side 31, forms a third cutting edge 45. The joining of the back, bottom section 27 of the back surface 11 to the bottom surface 5, at its back side 33, forms a fourth cutting edge 47. The third and fourth cutting edges 45, 47 are parallel to each other and transverse to the side surfaces 7.
The third and fourth cutting edges 45, 47 are also parallel to the first and second cutting edges 41, 43.
The tooth 1 has a threaded, central, mounting hole 49 extending through the tooth between the central sections 23, 35 on the front and back surfaces 9, 11. The hole 49 is centrally located on the tooth between the top and bottom surfaces 3, 5 and is also centrally located between the side surfaces 7. The hole 49 extends transverse to the cutting edges 41, 43, 45, 47 and its center is equidistant from all of them.
The back, central section 35 on the back surface 11 of the tooth together with adjacent portions of the top and bottom sections 25, 27 on the back surface 11 form a first mounting 6.
surface S1 for the tooth as shown in Fig. 3C and as will be described. The front, central section 19 on the front surface 9 together with adjacent portions of the top and bottom sections 13, 15 on the front surface 9 form a second mounting surface 53 for the tooth as shown in Fig. 3A and as will be described.
The saw tooth 1 is adapted to be mounted on a mounting block 55 to form a saw tooth assembly 57. The mounting block 55, as shown in Figs. 1 and 2, has a top and a bottom surface 59, 61; side surfaces 63; and front and back surfaces 65, 67. The top and bottom surfaces 59, 61 converge slightly toward the back; the front and back surfaces 65, 67 are parallel; and the side surfaces 63 are also parallel. The front of the block 55 is under cut back from the front surface 65, as shown at 69, to produce a forwardly extending projection 71 having a bottom surface 73 that is parallel to the top surface 59.
The front of the projection 71 is beveled at the top and bottom as shown at 75, 77 at an angle ~. The distance "L" between the beveled surfaces 75, 77 on the front surface 65 of the projection 71 is equal to the distance "L" between the top and bottom sections 13, 15 or 25, 27 on the front or back surfaces 9, 11 of the tooth 1. The depth "d" of the projection 71 is slightly less than the depth "D" of the tooth between its top and bottom surfaces 3, 5. The front surface 65 together with the beveled surfaces 75, 77 form a saw tooth mounting surface 79 as shown in Fig. 3.
7.
The mounting block 55 is adapted to be mounted on the rim 81 of a circular saw 83, as shown in Figs. 1 and 3. To this end, the bottom surface 61 of the block 55 has a longitudinal, central, groove 85 for receiving the rim 81. The block can be welded onto the rim or bolted on by bolts (not shown). The mounting block 55 also has a longitudinal mounting hole 87 that is centered on the front surface 65 of the projection 71 and extends transversely therefrom through the block.
With the mounting block 55 mounted on the rim of a saw 83, the saw tooth 1 is mounted on the block 55 by locating its first mounting surface 51 adjacent the mounting surface 79 on the projection 71 as shown in Fig. 3A. A bolt 91 is then passed through the longitudinal mounting hole 87 in the block and threaded into the threaded mounting hole 49 on the tooth 1. As the bolt 91 is tightened it draws the central section 35 of the back surface 11 of the tooth tight against the front surface 65 of the projection 71 and the back, end sections 25, 27 of the back surface 11 tight onto the beveled surfaces 75, 77. The beveled surfaces 75, 77 help to locate the tooth 1 on the projection 71 on the block 55. Thus the tooth 1 is locked onto the projection 71 with its first cutting edge 41 in the cutting position slightly above the block 55 and leading in the directiion of rotation, as shown by the arrow "R", in Fig. 1. The undercut 69 on the block 55 provides clearance for the bottom portion of the tooth 1 from the rim 81 of the saw blade 83 when the tooth 1 is mounted on the projection 71.
The mounting block 55 is adapted to be mounted on the rim 81 of a circular saw 83, as shown in Figs. 1 and 3. To this end, the bottom surface 61 of the block 55 has a longitudinal, central, groove 85 for receiving the rim 81. The block can be welded onto the rim or bolted on by bolts (not shown). The mounting block 55 also has a longitudinal mounting hole 87 that is centered on the front surface 65 of the projection 71 and extends transversely therefrom through the block.
With the mounting block 55 mounted on the rim of a saw 83, the saw tooth 1 is mounted on the block 55 by locating its first mounting surface 51 adjacent the mounting surface 79 on the projection 71 as shown in Fig. 3A. A bolt 91 is then passed through the longitudinal mounting hole 87 in the block and threaded into the threaded mounting hole 49 on the tooth 1. As the bolt 91 is tightened it draws the central section 35 of the back surface 11 of the tooth tight against the front surface 65 of the projection 71 and the back, end sections 25, 27 of the back surface 11 tight onto the beveled surfaces 75, 77. The beveled surfaces 75, 77 help to locate the tooth 1 on the projection 71 on the block 55. Thus the tooth 1 is locked onto the projection 71 with its first cutting edge 41 in the cutting position slightly above the block 55 and leading in the directiion of rotation, as shown by the arrow "R", in Fig. 1. The undercut 69 on the block 55 provides clearance for the bottom portion of the tooth 1 from the rim 81 of the saw blade 83 when the tooth 1 is mounted on the projection 71.
8.
When the first cutting edge 41 on the tooth 1 becomes dull, as shown in Fig. 3A, the bolt 91 is loosened and the tooth is rotated, as shown by the arrow "A", to place the dull cutting edge on the bottom and the second, unused cutting edge 43, on the same front surface 9, on the top at the front. The bolt 91 is retightened.
When the second cutting edge 43 becomes dull, the bolt 91 is loosened and removed and the tooth is turned around, as shown by the arrow "B" in Fig. 3B to put its back surface 11 at the front.
The tooth is then remounted on the block 55 with the bolt 91 with its second mounting surface 53 adjacent the mounting surface 79 on the projection 71 as shown in Fig. 3C. The third cutting edge 45 is at the front and top of the block 55. When this third cutting edge 45 becomes dull, the bolt 91 is again loosened and the tooth is once again rotated, as shown by the arrow "C" in Fig. 3C, to place the fourth cutting edge 47 on the top and in front of the block 55, still with the second mounting surface 53 on the tooth adjacent the mounting surface 79 on the block.
It will be seen that the improved saw tooth is easily and correctly mounted on the saw, through the mounting block, and also easily manipulated to locate any one of four cutting edges in the proper cutting position.
While the cutting edges on the saw tooth have been shown to be formed by straight, angled surfaces on the front and back surfaces joining the top and bottom surfaces, they could also be formed with 9.
curved surfaces on the front and back surfaces joining the top and bottom surfaces. As shown in Fig. 5, a saw tooth 1' can be provided having front and back surfaces 9', 11' with concavely curved top and bottom sections 13', 15' and 25', 27' respectively. The front, curved, top and bottom serctions 13', 15' merge smoothly with the straight, front central section 23' and the back, curved, top and bottom sections 25', 27' merge smoothly with the straight, back, central section 35'. The juncture of the front, top and bottom sections 13', 15, with the top and bottom surfaces 3', 5', produce straight cutting edges 41', 43' and the juncture of the back, top and bottom sections 25', 27' with the top and bottom surfaces 3', 5' produce straight cutting edges 45', 47'. The top and bottom sections 13', 15' and 25', 27, can be curved along a radius "r" of suitable length.
If the tooth employs curved surfaces to form the cutting edges, then the projection also employs similar, complementary curved surfaces in place of the beveled surfaces in order to properly mount the tooth on the block.
When the first cutting edge 41 on the tooth 1 becomes dull, as shown in Fig. 3A, the bolt 91 is loosened and the tooth is rotated, as shown by the arrow "A", to place the dull cutting edge on the bottom and the second, unused cutting edge 43, on the same front surface 9, on the top at the front. The bolt 91 is retightened.
When the second cutting edge 43 becomes dull, the bolt 91 is loosened and removed and the tooth is turned around, as shown by the arrow "B" in Fig. 3B to put its back surface 11 at the front.
The tooth is then remounted on the block 55 with the bolt 91 with its second mounting surface 53 adjacent the mounting surface 79 on the projection 71 as shown in Fig. 3C. The third cutting edge 45 is at the front and top of the block 55. When this third cutting edge 45 becomes dull, the bolt 91 is again loosened and the tooth is once again rotated, as shown by the arrow "C" in Fig. 3C, to place the fourth cutting edge 47 on the top and in front of the block 55, still with the second mounting surface 53 on the tooth adjacent the mounting surface 79 on the block.
It will be seen that the improved saw tooth is easily and correctly mounted on the saw, through the mounting block, and also easily manipulated to locate any one of four cutting edges in the proper cutting position.
While the cutting edges on the saw tooth have been shown to be formed by straight, angled surfaces on the front and back surfaces joining the top and bottom surfaces, they could also be formed with 9.
curved surfaces on the front and back surfaces joining the top and bottom surfaces. As shown in Fig. 5, a saw tooth 1' can be provided having front and back surfaces 9', 11' with concavely curved top and bottom sections 13', 15' and 25', 27' respectively. The front, curved, top and bottom serctions 13', 15' merge smoothly with the straight, front central section 23' and the back, curved, top and bottom sections 25', 27' merge smoothly with the straight, back, central section 35'. The juncture of the front, top and bottom sections 13', 15, with the top and bottom surfaces 3', 5', produce straight cutting edges 41', 43' and the juncture of the back, top and bottom sections 25', 27' with the top and bottom surfaces 3', 5' produce straight cutting edges 45', 47'. The top and bottom sections 13', 15' and 25', 27, can be curved along a radius "r" of suitable length.
If the tooth employs curved surfaces to form the cutting edges, then the projection also employs similar, complementary curved surfaces in place of the beveled surfaces in order to properly mount the tooth on the block.
10 .
Claims (18)
1. A saw tooth having;
parallel top and bottom surfaces;
each top and bottom surface having a front side and a back side, the front and back sides parallel to each other;
parallel side surfaces extending between the top and bottom surfaces;
front and back surfaces extending between the top and bottom surfaces;
the front surface having top and bottom sections, the top and bottom sections extending from the front sides of the top and bottom surfaces respectively, and also extending inwardly from the front sides to form front, top and bottom cutting edges at the front, top and bottom sides; the back surface having top and bottom sections, the top and bottom sections extending from the back sides of the top and bottom surfaces respectively, and also extending inwardly from the back sides to form back, top and bottom cutting edges at the back, top and bottom sides;
the back surface being identical to the front surface but reversed one hundred and eighty degrees.
parallel top and bottom surfaces;
each top and bottom surface having a front side and a back side, the front and back sides parallel to each other;
parallel side surfaces extending between the top and bottom surfaces;
front and back surfaces extending between the top and bottom surfaces;
the front surface having top and bottom sections, the top and bottom sections extending from the front sides of the top and bottom surfaces respectively, and also extending inwardly from the front sides to form front, top and bottom cutting edges at the front, top and bottom sides; the back surface having top and bottom sections, the top and bottom sections extending from the back sides of the top and bottom surfaces respectively, and also extending inwardly from the back sides to form back, top and bottom cutting edges at the back, top and bottom sides;
the back surface being identical to the front surface but reversed one hundred and eighty degrees.
2. A saw tooth as claimed in claim 1 including a mounting hole extending through the tooth between the front and back surfaces, the mounting hole centrally located between the top and bottom surfaces and centrally located between the side surfaces.
3. A saw tooth as claimed in claim 2 wherein the front, top and bottom cutting edges are parallel and the back, top and bottom cutting edges are parallel.
4. A saw tooth as claimed in claim 2 wherein the front and back top cutting edges are parallel and the bottom front and back cutting edges are parallel.
11.
11.
5. A saw tooth as claimed in claim 1 wherein the top and bottom sections on both the front and back surfaces are angled inwardly from the front and back sides at an angle, to an imaginary plane joining the front sides and an imaginary plane joining the back sides, of between twenty degrees and sixty five degrees.
6. A saw tooth as claimed in claim 1 wherein the top and bottom sections on both the front and back surfaces are angled inwardly from the front and back sides at an angle, to an imaginary plane joining the front sides and an imaginary plane joining the back sides, of about forty five degrees.
7. A saw tooth as claimed in claim 1 wherein the top and bottom sections on each of the front and back surfaces are joined by a central section, the central sections on the front and back surfaces being parallel and transverse to the top and bottom surfaces.
8. A saw tooth as claimed in claim 1 wherein a central portion of the front surface forms a first mounting surface for mounting the tooth on a mounting block in a first position and a central portion of the front surface forms a second mounting surface for mounting the tooth on a mounting block in a second position.
9. A saw tooth as claimed in claim 1 wherein the top and bottom sections on both the front and back surfaces are curved concavely inwardly from the front and back sides.
10. A saw tooth having:
parallel top and bottom surfaces;
each top and bottom surface having parallel front and back sides;
side surfaces;
and front and back surfaces;
the front surface extending between the front sides of the top and bottom surfaces and also extending inwardly from the front sides to form 12.
cutting edges at both front sides;
the back surface extending between the back sides of the top and bottom surfaces and also extending inwardly from the back sides to form cutting edges at both back sides;
the cutting edges at the front sides parallel to each other, the cutting edges at the back sides parallel to each other; and the cutting edges at the front sides parallel to the cutting edges at the back sides.
parallel top and bottom surfaces;
each top and bottom surface having parallel front and back sides;
side surfaces;
and front and back surfaces;
the front surface extending between the front sides of the top and bottom surfaces and also extending inwardly from the front sides to form 12.
cutting edges at both front sides;
the back surface extending between the back sides of the top and bottom surfaces and also extending inwardly from the back sides to form cutting edges at both back sides;
the cutting edges at the front sides parallel to each other, the cutting edges at the back sides parallel to each other; and the cutting edges at the front sides parallel to the cutting edges at the back sides.
11. A saw tooth as claimed in claim 10 wherein a central portion of the front surface forms a first mounting surface for use in mounting the saw tooth in a first position on a mounting block, and a central portion of the back surface forms a second mounting surface for use in mounting the saw tooth in a second position on the mounting block.
12. A saw tooth as claimed in claim 10 including a mounting hole extending through the tooth between the front and back surfaces, the mounting hole centrally located between the top and bottom surfaces and centrally located between the side surfaces.
13. A saw tooth assembly having:
a saw tooth, the saw tooth having;
parallel top and bottom surfaces;
each top and bottom surface having parallel front and back sides;
side surfaces;
and front and back surfaces;
the front surface extending between the front sides of the top and bottom surfaces and also extending inwardly from the front sides to form cutting edges at both front sides;
the back surface extending between the back sides of the top and bottom surfaces and also extending inwardly from the back sides to form 13.
cutting edges at both back sides;
the cutting edges at the front sides parallel to each other, the cutting edges at the back sides parallel to each other; and the cutting edges at the front sides parallel to the cutting edges at the back sides;
a mounting block;
mounting means on the mounting block for use in mounting the block on a rim of a circular saw blade;
cooperating mounting surfaces on the mounting block, and on both the front and back surfaces of the saw tooth, to locate any one of the four cutting edges in cutting position when the saw tooth is detachably mounted on the block;
and a bolt detachably connecting the tooth to the block with the mounting surface on the block abutting one of the mounting surfaces on the front and back surfaces of the tooth.
a saw tooth, the saw tooth having;
parallel top and bottom surfaces;
each top and bottom surface having parallel front and back sides;
side surfaces;
and front and back surfaces;
the front surface extending between the front sides of the top and bottom surfaces and also extending inwardly from the front sides to form cutting edges at both front sides;
the back surface extending between the back sides of the top and bottom surfaces and also extending inwardly from the back sides to form 13.
cutting edges at both back sides;
the cutting edges at the front sides parallel to each other, the cutting edges at the back sides parallel to each other; and the cutting edges at the front sides parallel to the cutting edges at the back sides;
a mounting block;
mounting means on the mounting block for use in mounting the block on a rim of a circular saw blade;
cooperating mounting surfaces on the mounting block, and on both the front and back surfaces of the saw tooth, to locate any one of the four cutting edges in cutting position when the saw tooth is detachably mounted on the block;
and a bolt detachably connecting the tooth to the block with the mounting surface on the block abutting one of the mounting surfaces on the front and back surfaces of the tooth.
14. A mounting assembly as claimed in claim 13 wherein the mounting block has a leading projection with the mounting surface at the front of the projection and a through mounting hole on the block for the bolt extending centrally through the projection, the projection having a height slightly less then the height of the tooth.
15. A mounting assembly as claimed in claim 14 wherein the top and bottom of the front of the projection is beveled.
16. A mounting assembly as claimed in claim 13 wherein the front and back surfaces of the saw tooth each have a central vertical section and angled top and bottom sections; a portion of the angled sections, together with the central section, on each of the front and back surfaces forming the two mounting surfaces on the tooth.
17. A mounting assembly as claimed in claim 13 wherein the front and back surfaces of the saw tooth each have a central vertical section and concavely curved top and bottom sections; a portion of the curved sections, 14.
together with the central section, on each of the front and back surfaces forming the two mounting surfaces on the tooth.
together with the central section, on each of the front and back surfaces forming the two mounting surfaces on the tooth.
18. A mounting assembly as claimed in claim 15 wherein the front and back surfaces of the saw tooth each have a central vertical section and angled top and bottom sections; portions of the angled sections, together with the central section, on each of the front and back surfaces forming the two mounting surfaces on the tooth, the portions of the angled sections abutting on the beveled surfaces of the projection on the block to center and hold the tooth on the block.
15.
15.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US2191996P | 1996-07-17 | 1996-07-17 | |
| US60/021,919 | 1996-07-17 | ||
| US75123996A | 1996-11-18 | 1996-11-18 | |
| US08/751,239 | 1996-11-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2208464A1 CA2208464A1 (en) | 1997-09-18 |
| CA2208464C true CA2208464C (en) | 1999-01-19 |
Family
ID=26695248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2208464 Expired - Lifetime CA2208464C (en) | 1996-07-17 | 1997-07-03 | Improved saw tooth |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2208464C (en) |
-
1997
- 1997-07-03 CA CA 2208464 patent/CA2208464C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2208464A1 (en) | 1997-09-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20170704 |