CA2214875A1 - Saw comprising a circular plate with integral peripheral tooth holders - Google Patents
Saw comprising a circular plate with integral peripheral tooth holders Download PDFInfo
- Publication number
- CA2214875A1 CA2214875A1 CA002214875A CA2214875A CA2214875A1 CA 2214875 A1 CA2214875 A1 CA 2214875A1 CA 002214875 A CA002214875 A CA 002214875A CA 2214875 A CA2214875 A CA 2214875A CA 2214875 A1 CA2214875 A1 CA 2214875A1
- Authority
- CA
- Canada
- Prior art keywords
- tooth
- trapezoidal
- circular plate
- circular saw
- circular
- 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.)
- Abandoned
Links
Classifications
-
- 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
- B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
- B23D61/02—Circular saw blades
- B23D61/04—Circular saw blades with inserted saw teeth the teeth being individually inserted
- B23D61/06—Circular saw blades with inserted saw teeth the teeth being individually inserted in exchangeable arrangement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/16—Milling-cutters characterised by physical features other than shape
- B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
- B23C5/202—Plate-like cutting inserts with special form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/08—Rake or top surfaces
- B23C2200/083—Rake or top surfaces curved
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/20—Top or side views of the cutting edge
- B23C2200/203—Curved cutting edges
Abstract
The present invention relates to a circular saw comprising:
- a circular plate;
- a plurality of tooth holders peripherally distributed on the circular plate; and - a plurality of teeth mounted to the tooth holders, respectively.
The circular plate and the tooth holders are formed in a single, machined piece of metal. Each tooth holder and the corresponding tooth have respective, mutually mating trapezoidal surfaces. Each tooth is formed with a trapezoidal rear face, forming the above mentioned trapezoidal mating surface, and a concave front face to define at the intersection of these trapezoidal rear face and concave front face four acute corner points interconnected by four arcuate sharp edges.
- a circular plate;
- a plurality of tooth holders peripherally distributed on the circular plate; and - a plurality of teeth mounted to the tooth holders, respectively.
The circular plate and the tooth holders are formed in a single, machined piece of metal. Each tooth holder and the corresponding tooth have respective, mutually mating trapezoidal surfaces. Each tooth is formed with a trapezoidal rear face, forming the above mentioned trapezoidal mating surface, and a concave front face to define at the intersection of these trapezoidal rear face and concave front face four acute corner points interconnected by four arcuate sharp edges.
Description
CA 0221487~ 1997-09-08 SAW COMPRISING A CIRCULAR PLATE WITH
INTEGRAL PERIPHERAL TOOTH HOLDERS
BACKGROUND OF THE INVENTION
1. Field of the invention:
The present invention relates to a circular saw having a circular plate with integral peripheral tooth holders.
15 2. Brief description of the prior art:
Prior art circular saws used on tree-felling machines conventionally comprise a circular plate and, for mounting the saw teeth, peripheral tooth holders welded to the circular plate.
A drawback is that the soldered joints often break when the circular saws are subjected to severe stresses.
OBJECTS OF THE INVENTION
An object of the present invention is to overcome the above discussed drawback of the prior art by providing a circular saw CA 0221487~ 1997-09-08 having a circular plate and peripheral tooth holders formed in a single machined piece of metal.
SUMMARY OF THE INVENTION
More specifically, in accordance with the present invention, there is provided a circular saw comprising:
a circular plate;
a plurality of tooth holders peripherally distributed on the circular plate; and a plurality of teeth mounted to the tooth holders, respectively.
To overcome the above discussed drawbacks of the prior art, the circular 15 plate and the tooth holders are formed in a single, machined piece of metal.
According to preferred embodiments of the invention:
20 - each tooth holder and the corresponding tooth have respective, mutually mating trapezoidal surfaces; and - each tooth is formed with a trapezoidal rear face and a concave front face to define at the intersection of these trapezoidal rear face and 25 concave front face four acute corner points interconnected by four arcuate sharp edges.
CA 0221487~ 1997-09-08 The objects, advantages and other features of the present invention will become more apparent upon reading of the following non restrictive description of a preferred embodiment thereof, given by way of example only with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the appended drawings:
Figure 1 is a side elevational view of the preferred embodiment of the circu-lar saw according to the present invention;
Figure 2 is a cross sectional, front elevational view of the circular saw of Figure 1;
Figure 3 is an enlarged, cross sectional front elevational view of a tooth holder and a tooth of the circular saw of Figure 1;
Figure 4 is an enlarged, partial side elevational view of the circular saw of Figure 1, showing the assembly of the teeth to the tooth holders;
Figure 5 is a perspective view of a tooth of the circular saw of Figure 1;
CA 0221487~ 1997-09-08 Figure 6 is a front elevational view of the tooth of Figure 5;
Figure 7 is a top plan view of the tooth of Figure 5; and Figure 8 is a side elevational view of the tooth of Figure 5.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment of the circular saw is generally identified by the reference 10 in the appended drawings. In the different figures of the drawings, the corresponding elements are identified by the same reference numerals.
The preferred embodiment of the present invention will be described hereinafter as a circular saw for tree-felling machines.
However, it should be kept in mind that other applications can be contemplated. Forexample, the dimensions, numberto teeth, and the method of fixation of the circular saw 10 can be modified and/or adjusted to meet with a particular application.
Referring to Figures 1, 2 and 3 of the appended drawings, the circular saw 10 comprises a flat circular plate 11 of uniform thickness. In the illustrated example, the thickness t1 (Figure 2) of the circular plate 11 is 1 inch.
CA 0221487~ 1997-09-08 In the center of the circular plate 11 are drilled holes 12 and 13. More specifically, these holes comprise a central hole 12 of larger diameter and eight holes 13 of smaller diameter distributed and equally spaced on a circle 14 centered on the rotation axis 15 of the circular saw 10. Holes 12 and 13 are used to mount the circular saw 10 5 on a tree-felling machine (not shown) in accordance with a conventional method of fixation. Of course it is within the scope of the present invention to adapt the circular plate 11 to other methods of fixation, conventional or not, of the saw 10 to a trcc fclling machine (not shown).
At the periphery of the circular plate 11 are distributed a plurality of tooth holders such as 16. In the illustrated example, the number of tooth holders is 24. It should be pointed out that the tooth holders 16 are integral with the circular plate 11 to make these tooth holders 16, and more generally the circular saw 10 as strong, rigid, solid 15 and sturdy as possible. Of course, this enables the tooth holders 16 to withstand higher stresses. More specifically, the circular plate 11 and the peripheral tooth holders 16 are machined in a same piece of material.
The material forming the circular disk 11 and the peripheral tooth holders 16is advantageously steel, for example CHT100 steel.
As can be seen in Figures 2 and 3, the tooth holders 16 are thicker than the circular plate 11; the thickness t2 of the tooth holders 16is 11/4 inch. As also illustrated in Figures 2 and 3, each tooth holder 16 is offset on one and the same side of the circular plate by 1/4 inch. This 25 provides for the clearance required at the level of the circular plate 11 formounting the circular saw 10 on a conventional tree-felling machine (not shown).
CA 0221487~ 1997-09-08 Figures 2 and 3 further show that the side faces 17 and 18 of each tooth holder 16 are planar and parallel to the plane of the flat circular plate 11.
Referring to Figure 4 of the appended drawings, the 5 base portion 22 of each tooth holder 16 defines a trapezoidal shape for reinforcement purposes. Also, considering a direction of rotation of the circular saw 10 given by the arrow 21, each tooth holder 16 has a generally planar rear face 19 and a front face 20.
10The front face 20 of each tooth holder 16 defines a transversal groove 23 having a generally trapezoidal cross section in the plane of the flat circular plate 11 to receive a tooth 24. In the illustrated example, the tooth 24 is made of 4140 steel and is secured to the corresponding tooth holder 16 by means of a bolt 25. A hole 26 is drilled 15into the tooth holder 16 between the rear 19 and front 20 faces to receive the bolt 25 having a head 26' resting on the rear face 19. The tooth 24 is formed with a central threaded hole 27 in which the bolt 25 is screwed.
The axis 28 of the hole 26 is not tangential to the circumference of the circular saw 10 but is inclined forwardly to give to the tooth 24 a more 20 efficient angle of attack. The tooth 24 can be centered, in the transverse direction of the circular saw, on the tooth holder 16 as shown in Figures 2 and 3; alternatively, it can be offset in the direction shown by the arrow 40 to allow side 41 of the circular saw 10 to more easily slide on, for example, the wood material.
CA 0221487~ 1997-09-08 Referring now to Figures 5-8 of the appended drawings, the tooth 5 defines a generally trapezoidal body 28, with a concave front face 29.
In particular, the rear face 30 of the tooth 24 is 5 trapezoidal (see Figure 8) in the cross section shown by line 31' of Figure 6 to fit into the groove 23 (Figure 4) of the tooth holder 16. The rear face 30 is also slightly trapezoidal in the cross section (see Figure 7) shown by line 42 of Figure 6.
The concave front face 29 and the trapezoidal shape of the rear face 30 of the tooth 24 form four acute corner points 31-34 interconnected by four sharp arcuate edges 35-38 outwardly offset from the rectangular flat portion 39 (Figure 6) of the tooth's rear face 30 for efficiently cutting, for example, tree trunks.
A non negligible advantage of the present invention is that the teeth 24 are revçrsible. For example, the bolt 25 (Figure 4) can be unscrewed and the tooth 24 rotated by 180~ about the axis 28 to substitute point 33 for point 31, edge 37 for edge 35, and point 34 for 20 point 32. This doubles the lifetime of the tooth 24.
The circular saw 10 according to the present invention presents, amongst others, the following advantages:
25 - since the circular plate 11 and the tooth holders 16 are made of a same machined piecç of steel, welding is no longer required to secure the tooth CA 0221487~ 1997-09-08 holders 16 to the circular plate 1 1 whereby the integrity of the circular saw 10 is preserved;
- since the circular plate 11 and the tooth holders 16 are made of a same machined piece of steel, inertia is higher and the tooth holders 16 can 5 withstand higher stresses;
- since the tooth holders 16 and circular plate 11 are machined into a single piece of metal, they can easily be made thinner and the teeth 24 can be accordingly be made narrower to reduce:
- the width of the saw kerf;
- the resistance of, for example, wood to penetration of the circular saw 10; and - the cost of the teeth 24.
Although the present invention has been described hereinabove by way of a preferred embodiment thereof, this embodiment can be modified at will, within the scope of the appended claims, without departing from the spirit and nature of the subject invention.
INTEGRAL PERIPHERAL TOOTH HOLDERS
BACKGROUND OF THE INVENTION
1. Field of the invention:
The present invention relates to a circular saw having a circular plate with integral peripheral tooth holders.
15 2. Brief description of the prior art:
Prior art circular saws used on tree-felling machines conventionally comprise a circular plate and, for mounting the saw teeth, peripheral tooth holders welded to the circular plate.
A drawback is that the soldered joints often break when the circular saws are subjected to severe stresses.
OBJECTS OF THE INVENTION
An object of the present invention is to overcome the above discussed drawback of the prior art by providing a circular saw CA 0221487~ 1997-09-08 having a circular plate and peripheral tooth holders formed in a single machined piece of metal.
SUMMARY OF THE INVENTION
More specifically, in accordance with the present invention, there is provided a circular saw comprising:
a circular plate;
a plurality of tooth holders peripherally distributed on the circular plate; and a plurality of teeth mounted to the tooth holders, respectively.
To overcome the above discussed drawbacks of the prior art, the circular 15 plate and the tooth holders are formed in a single, machined piece of metal.
According to preferred embodiments of the invention:
20 - each tooth holder and the corresponding tooth have respective, mutually mating trapezoidal surfaces; and - each tooth is formed with a trapezoidal rear face and a concave front face to define at the intersection of these trapezoidal rear face and 25 concave front face four acute corner points interconnected by four arcuate sharp edges.
CA 0221487~ 1997-09-08 The objects, advantages and other features of the present invention will become more apparent upon reading of the following non restrictive description of a preferred embodiment thereof, given by way of example only with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the appended drawings:
Figure 1 is a side elevational view of the preferred embodiment of the circu-lar saw according to the present invention;
Figure 2 is a cross sectional, front elevational view of the circular saw of Figure 1;
Figure 3 is an enlarged, cross sectional front elevational view of a tooth holder and a tooth of the circular saw of Figure 1;
Figure 4 is an enlarged, partial side elevational view of the circular saw of Figure 1, showing the assembly of the teeth to the tooth holders;
Figure 5 is a perspective view of a tooth of the circular saw of Figure 1;
CA 0221487~ 1997-09-08 Figure 6 is a front elevational view of the tooth of Figure 5;
Figure 7 is a top plan view of the tooth of Figure 5; and Figure 8 is a side elevational view of the tooth of Figure 5.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment of the circular saw is generally identified by the reference 10 in the appended drawings. In the different figures of the drawings, the corresponding elements are identified by the same reference numerals.
The preferred embodiment of the present invention will be described hereinafter as a circular saw for tree-felling machines.
However, it should be kept in mind that other applications can be contemplated. Forexample, the dimensions, numberto teeth, and the method of fixation of the circular saw 10 can be modified and/or adjusted to meet with a particular application.
Referring to Figures 1, 2 and 3 of the appended drawings, the circular saw 10 comprises a flat circular plate 11 of uniform thickness. In the illustrated example, the thickness t1 (Figure 2) of the circular plate 11 is 1 inch.
CA 0221487~ 1997-09-08 In the center of the circular plate 11 are drilled holes 12 and 13. More specifically, these holes comprise a central hole 12 of larger diameter and eight holes 13 of smaller diameter distributed and equally spaced on a circle 14 centered on the rotation axis 15 of the circular saw 10. Holes 12 and 13 are used to mount the circular saw 10 5 on a tree-felling machine (not shown) in accordance with a conventional method of fixation. Of course it is within the scope of the present invention to adapt the circular plate 11 to other methods of fixation, conventional or not, of the saw 10 to a trcc fclling machine (not shown).
At the periphery of the circular plate 11 are distributed a plurality of tooth holders such as 16. In the illustrated example, the number of tooth holders is 24. It should be pointed out that the tooth holders 16 are integral with the circular plate 11 to make these tooth holders 16, and more generally the circular saw 10 as strong, rigid, solid 15 and sturdy as possible. Of course, this enables the tooth holders 16 to withstand higher stresses. More specifically, the circular plate 11 and the peripheral tooth holders 16 are machined in a same piece of material.
The material forming the circular disk 11 and the peripheral tooth holders 16is advantageously steel, for example CHT100 steel.
As can be seen in Figures 2 and 3, the tooth holders 16 are thicker than the circular plate 11; the thickness t2 of the tooth holders 16is 11/4 inch. As also illustrated in Figures 2 and 3, each tooth holder 16 is offset on one and the same side of the circular plate by 1/4 inch. This 25 provides for the clearance required at the level of the circular plate 11 formounting the circular saw 10 on a conventional tree-felling machine (not shown).
CA 0221487~ 1997-09-08 Figures 2 and 3 further show that the side faces 17 and 18 of each tooth holder 16 are planar and parallel to the plane of the flat circular plate 11.
Referring to Figure 4 of the appended drawings, the 5 base portion 22 of each tooth holder 16 defines a trapezoidal shape for reinforcement purposes. Also, considering a direction of rotation of the circular saw 10 given by the arrow 21, each tooth holder 16 has a generally planar rear face 19 and a front face 20.
10The front face 20 of each tooth holder 16 defines a transversal groove 23 having a generally trapezoidal cross section in the plane of the flat circular plate 11 to receive a tooth 24. In the illustrated example, the tooth 24 is made of 4140 steel and is secured to the corresponding tooth holder 16 by means of a bolt 25. A hole 26 is drilled 15into the tooth holder 16 between the rear 19 and front 20 faces to receive the bolt 25 having a head 26' resting on the rear face 19. The tooth 24 is formed with a central threaded hole 27 in which the bolt 25 is screwed.
The axis 28 of the hole 26 is not tangential to the circumference of the circular saw 10 but is inclined forwardly to give to the tooth 24 a more 20 efficient angle of attack. The tooth 24 can be centered, in the transverse direction of the circular saw, on the tooth holder 16 as shown in Figures 2 and 3; alternatively, it can be offset in the direction shown by the arrow 40 to allow side 41 of the circular saw 10 to more easily slide on, for example, the wood material.
CA 0221487~ 1997-09-08 Referring now to Figures 5-8 of the appended drawings, the tooth 5 defines a generally trapezoidal body 28, with a concave front face 29.
In particular, the rear face 30 of the tooth 24 is 5 trapezoidal (see Figure 8) in the cross section shown by line 31' of Figure 6 to fit into the groove 23 (Figure 4) of the tooth holder 16. The rear face 30 is also slightly trapezoidal in the cross section (see Figure 7) shown by line 42 of Figure 6.
The concave front face 29 and the trapezoidal shape of the rear face 30 of the tooth 24 form four acute corner points 31-34 interconnected by four sharp arcuate edges 35-38 outwardly offset from the rectangular flat portion 39 (Figure 6) of the tooth's rear face 30 for efficiently cutting, for example, tree trunks.
A non negligible advantage of the present invention is that the teeth 24 are revçrsible. For example, the bolt 25 (Figure 4) can be unscrewed and the tooth 24 rotated by 180~ about the axis 28 to substitute point 33 for point 31, edge 37 for edge 35, and point 34 for 20 point 32. This doubles the lifetime of the tooth 24.
The circular saw 10 according to the present invention presents, amongst others, the following advantages:
25 - since the circular plate 11 and the tooth holders 16 are made of a same machined piecç of steel, welding is no longer required to secure the tooth CA 0221487~ 1997-09-08 holders 16 to the circular plate 1 1 whereby the integrity of the circular saw 10 is preserved;
- since the circular plate 11 and the tooth holders 16 are made of a same machined piece of steel, inertia is higher and the tooth holders 16 can 5 withstand higher stresses;
- since the tooth holders 16 and circular plate 11 are machined into a single piece of metal, they can easily be made thinner and the teeth 24 can be accordingly be made narrower to reduce:
- the width of the saw kerf;
- the resistance of, for example, wood to penetration of the circular saw 10; and - the cost of the teeth 24.
Although the present invention has been described hereinabove by way of a preferred embodiment thereof, this embodiment can be modified at will, within the scope of the appended claims, without departing from the spirit and nature of the subject invention.
Claims (8)
1. A circular saw comprising:
a circular plate;
a plurality of tooth holders peripherally distributed on the circular plate; and a plurality of teeth mounted to the tooth holders, respectively;
wherein the circular plate and the tooth holders are formed in a single, machined piece of metal.
a circular plate;
a plurality of tooth holders peripherally distributed on the circular plate; and a plurality of teeth mounted to the tooth holders, respectively;
wherein the circular plate and the tooth holders are formed in a single, machined piece of metal.
2. A circular saw as recited in claim 1, wherein the circular plate has a first thickness, and the tooth holders have a second thickness greater than the first thickness.
3. A circular saw as recited in claim 2, wherein the tooth holders are offset about the circular plate on one side of said circular plate.
4. A circular saw as recited in claim 1, wherein each tooth holder and the corresponding tooth have respective, mutually mating trapezoidal surfaces.
5. A circular saw as recited in claim 4, in which the trapezoidal surface of each tooth holder defines a transversal groove having a trapezoidal cross section.
6. A circular saw as recited in claim 4, wherein:
each tooth holder has a rear face, a front face defining said trapezoidal surface, and a hole extending from said rear face to said front face;
each tooth has a threaded hole through said trapezoidal surface;
said circular saw further comprises a bolt extending though the hole of each tooth holder, said bolt comprising a head resting on the rear face of the tooth holder and a threaded free end screwed into the threaded hole of the corresponding tooth for removably mounting said tooth to the tooth holder.
each tooth holder has a rear face, a front face defining said trapezoidal surface, and a hole extending from said rear face to said front face;
each tooth has a threaded hole through said trapezoidal surface;
said circular saw further comprises a bolt extending though the hole of each tooth holder, said bolt comprising a head resting on the rear face of the tooth holder and a threaded free end screwed into the threaded hole of the corresponding tooth for removably mounting said tooth to the tooth holder.
7. A circular saw as recited in claim 1, wherein each tooth is formed with a trapezoidal rear face and a concave front face to define at the intersection of said trapezoidal rear face and concave front face four acute corner points interconnected by four arcuate sharp edges.
8. A circular saw as recited in claim 7, in which the trapezoidal rear face of each tooth is trapezoidal both in a first cross section and in a second cross section perpendicular to said first cross section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002214875A CA2214875A1 (en) | 1997-09-08 | 1997-09-08 | Saw comprising a circular plate with integral peripheral tooth holders |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002214875A CA2214875A1 (en) | 1997-09-08 | 1997-09-08 | Saw comprising a circular plate with integral peripheral tooth holders |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2214875A1 true CA2214875A1 (en) | 1999-03-08 |
Family
ID=4161414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002214875A Abandoned CA2214875A1 (en) | 1997-09-08 | 1997-09-08 | Saw comprising a circular plate with integral peripheral tooth holders |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2214875A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2939780A4 (en) * | 2012-12-27 | 2016-08-31 | Tungaloy Corp | Cutting insert and rotary cutting tool with replaceable blade edge |
-
1997
- 1997-09-08 CA CA002214875A patent/CA2214875A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2939780A4 (en) * | 2012-12-27 | 2016-08-31 | Tungaloy Corp | Cutting insert and rotary cutting tool with replaceable blade edge |
| US9796032B2 (en) | 2012-12-27 | 2017-10-24 | Tungaloy Corporation | Cutting insert and indexable rotary cutting tool |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |