CA2044957C - Non-destructive composite material saw blade - Google Patents
Non-destructive composite material saw bladeInfo
- Publication number
- CA2044957C CA2044957C CA 2044957 CA2044957A CA2044957C CA 2044957 C CA2044957 C CA 2044957C CA 2044957 CA2044957 CA 2044957 CA 2044957 A CA2044957 A CA 2044957A CA 2044957 C CA2044957 C CA 2044957C
- Authority
- CA
- Canada
- Prior art keywords
- cutting
- saw blade
- blade
- rim
- cut
- 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 - Fee Related
Links
- 239000002131 composite material Substances 0.000 title abstract description 9
- 238000005520 cutting process Methods 0.000 claims abstract description 83
- 239000000463 material Substances 0.000 claims abstract description 45
- 230000000284 resting effect Effects 0.000 claims description 2
- 210000000569 greater omentum Anatomy 0.000 abstract description 12
- 229910052729 chemical element Inorganic materials 0.000 abstract description 4
- 230000001066 destructive effect Effects 0.000 abstract 1
- 208000020401 Depressive disease Diseases 0.000 description 4
- 230000036346 tooth eruption Effects 0.000 description 3
- 229910000760 Hardened steel Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241000736839 Chara Species 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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
- B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
-
- 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
- B23D61/025—Details of saw blade body
-
- 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, i.e. the teeth being individually inserted
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Cutting Devices (AREA)
- Crushing And Pulverization Processes (AREA)
- Dovetailed Work, And Nailing Machines And Stapling Machines For Wood (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Abstract
A non-destructive saw blade for composite material is disclosed.
The saw blade has a series of teeth which are formed with cutting elements which are spaced inwardly from an outer circumferential edge and have sides which extend outwardly from planar sides of the saw blade. The saw blade is designed to cut yieldable material without cutting the carrier medium which can be a conveyor belt or a caul. Cutting is achieved by pushing the blade into the yieldable material until a cutting element engages the material. Movement of the blade then causes the cutting ele-ment to cut the yieldable material until a full depth cut is accomplished.
The conveyor belt or caul is not cut by the saw blade outer edge which acts like a smooth disk. The saw blade can include a wear strip positioned on the outer circumferential rim to lengthen the life of the saw blade and conveyor belt or caul.
The saw blade has a series of teeth which are formed with cutting elements which are spaced inwardly from an outer circumferential edge and have sides which extend outwardly from planar sides of the saw blade. The saw blade is designed to cut yieldable material without cutting the carrier medium which can be a conveyor belt or a caul. Cutting is achieved by pushing the blade into the yieldable material until a cutting element engages the material. Movement of the blade then causes the cutting ele-ment to cut the yieldable material until a full depth cut is accomplished.
The conveyor belt or caul is not cut by the saw blade outer edge which acts like a smooth disk. The saw blade can include a wear strip positioned on the outer circumferential rim to lengthen the life of the saw blade and conveyor belt or caul.
Description
-NON-DESTRUCTIVE COMPOSITE MATERIAL SAW BLADE
BACKGROUND OF THE INVENl~ON
The present invention relates to cutting implements, and more par-ticularly to saw blades for a yieldable material.
Previously, when it was desired to cut a composite material such as a loose mat of oriented strand board in the uncured state it was conven-tional to use a rotating circular saw blade of conventional design. Oriented strand board is formed of elongated wood particles or chips and one or mo-e binder ingredients. The mat while being loose in the uncured state is stiff and retains its shape while supported on a flat surface. Conventional saw blades have teeth extending outwardly from an outer circumferential rim of the saw blade. These teeth are formed with an ou~twardly extending cutting element that is designed to engage the material to be cut. When the conventional saw blade cuts through the full thickness of the loose mat, the blade will then cut into the surface of the carrier medi-lm because there is no means of preventing the cutting surfaces on the teeth from engaging the carrier merlillm. As a result, the surface of the carrier medium such as the screen, belt or caul that carries the loose mat is damaged.
There have been several attempts in the past to design a blade for cutting yieldable materials such as fabric or uncured rubber. These prior art cutting blades are designed for very specific purposes and are structur-ally and operationally quite different from the present invention. None would be useful for cutting composite material such as oriented strand board. One such example of a prior art blade is shown in Rizer et al., U.S.
Patent No. 3,798,767 which i;s directed to a device for cutting flexible ~' B
BACKGROUND OF THE INVENl~ON
The present invention relates to cutting implements, and more par-ticularly to saw blades for a yieldable material.
Previously, when it was desired to cut a composite material such as a loose mat of oriented strand board in the uncured state it was conven-tional to use a rotating circular saw blade of conventional design. Oriented strand board is formed of elongated wood particles or chips and one or mo-e binder ingredients. The mat while being loose in the uncured state is stiff and retains its shape while supported on a flat surface. Conventional saw blades have teeth extending outwardly from an outer circumferential rim of the saw blade. These teeth are formed with an ou~twardly extending cutting element that is designed to engage the material to be cut. When the conventional saw blade cuts through the full thickness of the loose mat, the blade will then cut into the surface of the carrier medi-lm because there is no means of preventing the cutting surfaces on the teeth from engaging the carrier merlillm. As a result, the surface of the carrier medium such as the screen, belt or caul that carries the loose mat is damaged.
There have been several attempts in the past to design a blade for cutting yieldable materials such as fabric or uncured rubber. These prior art cutting blades are designed for very specific purposes and are structur-ally and operationally quite different from the present invention. None would be useful for cutting composite material such as oriented strand board. One such example of a prior art blade is shown in Rizer et al., U.S.
Patent No. 3,798,767 which i;s directed to a device for cutting flexible ~' B
- 2 - 20~g9~;7 material such as carpet. In the device of Rizer et al. a blade 35 is provided having spaced semicircular shaped teeth with a smooth outer surface. The root portion 30 of the teeth have an inner surface 37 which is sharpened to act as the cutting surface with a cutting edge. Fabric such as carpet is pushed into the cutting blade and is sandwiched between the cutting blade 27 and block 15. As the device is advanced, material is pushed into the area between block 15 and the blade 37 by the outer surface 36 of the teeth 28. The material is then cut by the surface 37 and the surface 41. Blade 27 and block 15 act like a pair of shears in that one of the blades is a cutting blade and the other blade is a stationary blade which holds the material in place.
Sauer, U.S. Patent No. 3,308,703 discloses another type of blade comprising a plate for grooving uncured rubber. The blade consist of an outer circumferential edge 13 which is beveled at 13a, 13b and 13c. The bevels are made such that they alternate in opposite directions of slope.
Positioned between the teeth 12 are gullets lS. Gullets 15 are formed with side cutting edges 16 and 17. The Sauer device operates on uncured rubber which is a sticky soft material which can have reinforcing material con-tained within the sticky soft mass. The outer rim of bevel teeth 12 are sharpened to cut into the rubber and create a groove. Advancement of the blade is continued until it reaches the cording or reinforcing material which strengthens the rubber. The sharpened surfaces 16, 17 at the root portions are designed to cut and remove the cording from the groove with-out removing the rem~inder of the cording. That is to say that the rubber is grooved as the cording material is cut without disturbing the position of the reinforcing matefial in the uncured rubber.
Martinu, U.S. Patent No. 4,133,361 discloses a device for machining and grooving composite material such as cured particle board. The device consist of a conical disk having a series of blades 62, 63 and 64 attached to the conical outward surface and a groove cutting bit 78 is attached at the center of the conical surface for grooving the composite matefial. This invention is intended to work on cured composite material which is in a hardened state. The device is designed to machine composite material boards such that joints can be formed easily and quickly.
Sauer, U.S. Patent No. 3,308,703 discloses another type of blade comprising a plate for grooving uncured rubber. The blade consist of an outer circumferential edge 13 which is beveled at 13a, 13b and 13c. The bevels are made such that they alternate in opposite directions of slope.
Positioned between the teeth 12 are gullets lS. Gullets 15 are formed with side cutting edges 16 and 17. The Sauer device operates on uncured rubber which is a sticky soft material which can have reinforcing material con-tained within the sticky soft mass. The outer rim of bevel teeth 12 are sharpened to cut into the rubber and create a groove. Advancement of the blade is continued until it reaches the cording or reinforcing material which strengthens the rubber. The sharpened surfaces 16, 17 at the root portions are designed to cut and remove the cording from the groove with-out removing the rem~inder of the cording. That is to say that the rubber is grooved as the cording material is cut without disturbing the position of the reinforcing matefial in the uncured rubber.
Martinu, U.S. Patent No. 4,133,361 discloses a device for machining and grooving composite material such as cured particle board. The device consist of a conical disk having a series of blades 62, 63 and 64 attached to the conical outward surface and a groove cutting bit 78 is attached at the center of the conical surface for grooving the composite matefial. This invention is intended to work on cured composite material which is in a hardened state. The device is designed to machine composite material boards such that joints can be formed easily and quickly.
- 3 - 20~49~7 Blake, U.S. Patent No. 4,766,794 discloses a conventional rotary saw blade having carbide inserts 18 positioned on the outer surface of the cut-ting teeth. The cutting surfaces of the inserts 18 are provided at different radial positions such that the blade does not bind within the kerf.
SUMMA~Y OF THE INVENTION
A first embodiment of the present invention is directed to a saw blade which is designed with a cutting element that cuts the desired mate-rial but not the surface of the flat supporting medium that carries that material. The saw blade of the present invention is formed with a series of teeth on the outer circumferential rim with each tooth having a cutting element that is positioned radially inwardly from the outer circumferential rim. Each cutting element is formed with outwardly extending side edges that engage the material to be cut. Both side edges of the cutting element are formed on surfaces tapering rearwardly relative to the planar side sur-faces of the saw blade. The top surface of the cutting element is formed tapering rearwardly relative to the outer circumferential rim of the saw blade. Formed in the interior and in the center of the saw blade are mounting holes for positioning the blade on a shaft to cause blade rotation.
Cutting of the yiel-l~hle material occurs by urging the outer rim of the saw blade into the yieldable material until the cutting element engages the yie~ ble material. Blade rotation can be caused to occur after the blade is inserted into the yieldable material or can be started prior to blade insertion in the yieldable material. The cutting elements advance through the yieldable material due to their rearwardly tapered surfaces and cutting edges which cause a shearing or cutting action through the yielcl~hle mate-rial. When the cut has reached its full depth the outer circumferential rim acts as a smooth disk which rides over the medium which carries the yieldable material. Thus, it can be seen that the outer circumferential rim allows the blade to cut the yieldable material yet ride over the carrier medium without cutting it.
In a second embodiment, a saw blade formed in accordance with the present invention also includes a carbide insert on the outer circumferen-tial rim of the blade. This insert is unsharpened. Thus, it can act to pre-vent undue wear of the saw blade which would allow the sharpened recessed cutting insert to come into contact with the conveyor ~elt. The ~ 4 ~ 2044957 life of the saw blade and the conveyor belt are prolonged by the use of an unsharpened insert on the outer circumferential rim.
Other aspects of this invention are as follows:
A saw blade for cutting yieldable material resting on a supporting surface without damaging the supporting surface which comprises:
a circular plate member having a non-cutting outer circumferential rim, planar side surfaces and mounting means to connect said plate member to drive means for rotating said saw blade about a central axis;
said plate member having a plurality of scalloped recesses spaced circumferentially around said rim to define therebetween a plurality of teeth having radially outer non-cutting circumferential surfaces spaced around and defining said non-cutting circumferential rim;
each of said teeth having a forward leading surface, a rearward trailing surface and a cutting element on said leading surface, said cutting element having a radially outer surface spaced radially inwardly from said rim and generally radial cutting edges protruding axially outwardly from said planar side surfaces so that said non-cutting circumferential rim may be pressed radially into said yieldable material to bring said cutting edges into cutting relationship with said yieldable material until said non-cutting outer circumferential rim engages but does not cut the supporting surface, each of said teeth having a hardened wear strip defining at least a portion of its outer non-cutting circumferential surface to maintain said cutting elements radially spaced inwardly therefrom.
~49 57 - 4a -Various advantages and features of novelty which characterize the invention are pointed out with particularity in the claims annexed hereto and forming a part hereof. However, for a better understanding of the invention, its advantages, and objects obtained by its use, reference should be had to the drawings which form a further part hereof, and to the accom-panying descriptive matter, in which there is illustrated and described a preferred embo~iment of the invention.
BRlEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a side view of a circular saw blade made in accordance with a first embodiment of the present invention;
Figure 2 is a fragmentary side view of a tooth of the saw blade dis-closed in Fig. 1;
Figure 3 is a fragmentary front view of the tooth of Figure 2 viewed rearwardly relative to the direction of rotation and showing the cutting element;
Figure 4 is a top view of the tooth of Figure 2;
Figure S is a fragmentary view of the saw blade of the present invention similar to Figure 3 after being pressed into a yieldable material;
Figure 6 is a view similar to Figure 5 showing the saw blade of the present invention after cutting a kerf in the yieldable material;
Figure 7 is a side view of a circular saw blade made in accordance with a second ernbo~liment of the present invention;
Figure 8 is a fragmentary side view of a tooth of the saw blade dis-closed in Fig. 7; and Figure 9 is a top view of the tooth of Fig. 8.
DETAILED DESCRIPTION OF THE DRAWINGS
Referring to the drawings, wherein like numerals indicate like ele-ments, circular saw blade 10 of the present invention is disclosed. Saw blade 10 comprises a disk which is formed of a metal material such as steel and having parallel planar sides 18. The saw blade is formed with an inner mounting means 11 which includes mounting holes lla and llb. Mounting hole lla is formed at the center of the blade and mounting holes llb are formed at a distance space from the center hole and 180 de~,ree~ apart.
The mounting holes lla and llb are designed to cooperate with a mounting structure (not shown) which is part of a device for causing blade rotation such as a motor having a shaft. Blade 10 is formed with a smooth outer circumferential rim 12 having formed therein scalloped portions 14 which define teeth 20, therebetween.
Referring now to Figure 2, the outer circumferential rim 12 is also formed with a series of relieved portions or depressions 16 which connect the upper surface 24 of the cutting element 22 to the outer circumferential rim. The to~ surface 24 of cutting element 22 is formed with a rearward taper which preferably corresponds to the rearward taper of the depression 16. The rearward character of each taper is relative to the direction of rotation of the circular blade. Front face 28 of cutting element 22 is formed perpendicular to a tangent of the outer circumferential rim 12.
Thus it can be seen that the surface 24 forms an angle relative to front face 28 of slightly less than 90.
Cutting element 22 is preferably formed as a carbide insert which is attached to the portion of the tooth that is recessed from the outer cir-cumferential edge. However, cutting element 22 may a~;o be formed of a hardened steel or other type of sharpenable and wear resistant material that is conventional. Cutting element 22 can also be formed integrally with the tooth or as a removable insert that is attached to the tooth 20.
Extending outwardly from the planar side surfaces 18 are cutting elelT-ent surfaces 26 which are formed rearwardly tapering relative to planar side surfaces 18. Tapered side surfaces 26 of cutting element 22 are designed to prevent the blade from being bound within the kerf. Thus, the insert acts as the cutting element and also prevents the blade from binding.
In operation the blade of the present invention is designed to cut a yieldable material and particularly a loose mat of uncured oriented strand board. This is achieved by causing blade 10 to be advanced radially into the yieldable oriented strand board such that the outer circumferential rim moves into the yieldahle material until the cutting teeth 22 engage the yieldable material 30, as shown in Figure 5. Alternatively, the critical engagement can result from movement of the work into the blade the axis of which remains stationery. The blade can be rotating as it is advancing into the material 30 or caused to rotate after insertion. Cutting teeth 22 -6- 204i957 are then advanced radially and/or tangentially through the material in a rotary fashion to cut the strand board. When a lull depth cut has been achieved, as shown in Figure 6, the outer circumferential rim 12 acts like a smooth circular disk and rides upon caul or conveyor belt 40 which is carry-ing the strand board. Thus it can be seen that the saw blade will not cut the conveyor belt or caul which is carrying the material since the blade does not have a sharpened outer edge.
As a specific example, an 18 inch diameter saw blade is designed to have a center mounting hole lla of one and 1~/16 inch diameter and corre-sponding side mounting holes of 19/32 inch diameter. The blade thickness is approximately 0.13~5 inches. The scalloped portions 14 define an angle of 24 between the front face 28 of one adjoining tooth 20 and the rear face 29 of the other adjoining tooth 20. The circumferential length of scal-loped portion 14 is approximately .460 inches and the length of depressions 16 on tooth 20 is approximately 0.400 inches. The cutting elements are recessed from outer circumferential rim 12 by 0.015 inches and their side edges extend outwardly 0.035 inches from planar side surfaces 18. All tapers on cutting element 22 are approximately 3 relative to either a tan-gent to the outer circumferential rim or planar side surfaces 18 respectively.
Figure ~ discloses a second embodiment of the present invention.
This embodiment is similar to the first embodiment; therefore, like ele-ments are similarly numl~red in the one hundreds. For e~r~mple, in the first embodiment, 10 refers to the saw blade and in the second embodiment 110 refers to the saw blade.
Referring to Figures 7-9, saw blade 110 is formed of a material such as steel and has planar sides 118. Mounting means 111 includes center mounting hole llla and mounting holes lllb. Outer circumferential rim 112 is formed with scalloped portions 114 which define teeth 120. Depres-sions or relieved portions 116 are spaced inwardly from outer circumferen-tial rim 112. Depressions 116 are adjacent outer circumferential rim 112.
Positioned adjacent depression 116 on each tooth is a cutting element 122 which is similar to cutting element 22. Depression 116 causes cutting ele-ment 122 to be spaced inwardly from outer circumferential rim 112. Thus, _~ _ 7 20~957 inwardly spaced cutting element 122 is prevented from contacting the con-veyor or caul which carries the material to be cut.
Positioned within depression 116 and extending rearwardly and radi-ally outwardly therefrom to the outer circumferential rim 11? is insert or wear strip llS. In a preferred embodiment, insert 115 is a carbide insert;
however, insert llS can be made of other similar wear resistant materials.
Further, in the preferred ernbo~liment~ wear strip llS is designed to extend 0.015 of an inch above the outer circumferential rim to a~so prevent wear of the rim. Insert 115 need not be a separate piece but can be formed inte-grally with saw blade 110 and specially treated to a wear resistant chara~
ter. Hardened steel can be used instead of carbide particularly where the insert is integrally with the blade. Insert 115 contains no sharp edges so that insert llS will not cut the conveyor or caul that carries the yieldable material.
In use, saw blade 110 is caused to rotate and contact a conveyor or caul in order to completely cut through the yiel~lable material. This con-tact causes outer circumferential rim 112 to be worn down if insert 115 is not present. Without the insert, rim 112 can be worn down until cutting element 122 is even with the rim, thus allowing cutting element 122 to cut the conveyor or caul. The second embodiment lengthens the life of the conveyor or caul by preventing a saw blade outer circumferential rim from wearing to the point where the cutting elements cut the conYeyor caul.
Additionally, the wear strips also lengthen the life of the saw blade which without the wear strips would have to be replaced before the rim is worn to the depth of the cutting elements.
The invention has been described in detail in the foregoing descrip-tion with reference to the accompanying drawings. However, the discl~
sure is illustrative only and the invention is not limited to the precise em~odiment illustrated. Various changes and modifications may be made therein by one skilled in the art without departing from the scope or spirit of the invention as defined by the appended claims.
SUMMA~Y OF THE INVENTION
A first embodiment of the present invention is directed to a saw blade which is designed with a cutting element that cuts the desired mate-rial but not the surface of the flat supporting medium that carries that material. The saw blade of the present invention is formed with a series of teeth on the outer circumferential rim with each tooth having a cutting element that is positioned radially inwardly from the outer circumferential rim. Each cutting element is formed with outwardly extending side edges that engage the material to be cut. Both side edges of the cutting element are formed on surfaces tapering rearwardly relative to the planar side sur-faces of the saw blade. The top surface of the cutting element is formed tapering rearwardly relative to the outer circumferential rim of the saw blade. Formed in the interior and in the center of the saw blade are mounting holes for positioning the blade on a shaft to cause blade rotation.
Cutting of the yiel-l~hle material occurs by urging the outer rim of the saw blade into the yieldable material until the cutting element engages the yie~ ble material. Blade rotation can be caused to occur after the blade is inserted into the yieldable material or can be started prior to blade insertion in the yieldable material. The cutting elements advance through the yieldable material due to their rearwardly tapered surfaces and cutting edges which cause a shearing or cutting action through the yielcl~hle mate-rial. When the cut has reached its full depth the outer circumferential rim acts as a smooth disk which rides over the medium which carries the yieldable material. Thus, it can be seen that the outer circumferential rim allows the blade to cut the yieldable material yet ride over the carrier medium without cutting it.
In a second embodiment, a saw blade formed in accordance with the present invention also includes a carbide insert on the outer circumferen-tial rim of the blade. This insert is unsharpened. Thus, it can act to pre-vent undue wear of the saw blade which would allow the sharpened recessed cutting insert to come into contact with the conveyor ~elt. The ~ 4 ~ 2044957 life of the saw blade and the conveyor belt are prolonged by the use of an unsharpened insert on the outer circumferential rim.
Other aspects of this invention are as follows:
A saw blade for cutting yieldable material resting on a supporting surface without damaging the supporting surface which comprises:
a circular plate member having a non-cutting outer circumferential rim, planar side surfaces and mounting means to connect said plate member to drive means for rotating said saw blade about a central axis;
said plate member having a plurality of scalloped recesses spaced circumferentially around said rim to define therebetween a plurality of teeth having radially outer non-cutting circumferential surfaces spaced around and defining said non-cutting circumferential rim;
each of said teeth having a forward leading surface, a rearward trailing surface and a cutting element on said leading surface, said cutting element having a radially outer surface spaced radially inwardly from said rim and generally radial cutting edges protruding axially outwardly from said planar side surfaces so that said non-cutting circumferential rim may be pressed radially into said yieldable material to bring said cutting edges into cutting relationship with said yieldable material until said non-cutting outer circumferential rim engages but does not cut the supporting surface, each of said teeth having a hardened wear strip defining at least a portion of its outer non-cutting circumferential surface to maintain said cutting elements radially spaced inwardly therefrom.
~49 57 - 4a -Various advantages and features of novelty which characterize the invention are pointed out with particularity in the claims annexed hereto and forming a part hereof. However, for a better understanding of the invention, its advantages, and objects obtained by its use, reference should be had to the drawings which form a further part hereof, and to the accom-panying descriptive matter, in which there is illustrated and described a preferred embo~iment of the invention.
BRlEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a side view of a circular saw blade made in accordance with a first embodiment of the present invention;
Figure 2 is a fragmentary side view of a tooth of the saw blade dis-closed in Fig. 1;
Figure 3 is a fragmentary front view of the tooth of Figure 2 viewed rearwardly relative to the direction of rotation and showing the cutting element;
Figure 4 is a top view of the tooth of Figure 2;
Figure S is a fragmentary view of the saw blade of the present invention similar to Figure 3 after being pressed into a yieldable material;
Figure 6 is a view similar to Figure 5 showing the saw blade of the present invention after cutting a kerf in the yieldable material;
Figure 7 is a side view of a circular saw blade made in accordance with a second ernbo~liment of the present invention;
Figure 8 is a fragmentary side view of a tooth of the saw blade dis-closed in Fig. 7; and Figure 9 is a top view of the tooth of Fig. 8.
DETAILED DESCRIPTION OF THE DRAWINGS
Referring to the drawings, wherein like numerals indicate like ele-ments, circular saw blade 10 of the present invention is disclosed. Saw blade 10 comprises a disk which is formed of a metal material such as steel and having parallel planar sides 18. The saw blade is formed with an inner mounting means 11 which includes mounting holes lla and llb. Mounting hole lla is formed at the center of the blade and mounting holes llb are formed at a distance space from the center hole and 180 de~,ree~ apart.
The mounting holes lla and llb are designed to cooperate with a mounting structure (not shown) which is part of a device for causing blade rotation such as a motor having a shaft. Blade 10 is formed with a smooth outer circumferential rim 12 having formed therein scalloped portions 14 which define teeth 20, therebetween.
Referring now to Figure 2, the outer circumferential rim 12 is also formed with a series of relieved portions or depressions 16 which connect the upper surface 24 of the cutting element 22 to the outer circumferential rim. The to~ surface 24 of cutting element 22 is formed with a rearward taper which preferably corresponds to the rearward taper of the depression 16. The rearward character of each taper is relative to the direction of rotation of the circular blade. Front face 28 of cutting element 22 is formed perpendicular to a tangent of the outer circumferential rim 12.
Thus it can be seen that the surface 24 forms an angle relative to front face 28 of slightly less than 90.
Cutting element 22 is preferably formed as a carbide insert which is attached to the portion of the tooth that is recessed from the outer cir-cumferential edge. However, cutting element 22 may a~;o be formed of a hardened steel or other type of sharpenable and wear resistant material that is conventional. Cutting element 22 can also be formed integrally with the tooth or as a removable insert that is attached to the tooth 20.
Extending outwardly from the planar side surfaces 18 are cutting elelT-ent surfaces 26 which are formed rearwardly tapering relative to planar side surfaces 18. Tapered side surfaces 26 of cutting element 22 are designed to prevent the blade from being bound within the kerf. Thus, the insert acts as the cutting element and also prevents the blade from binding.
In operation the blade of the present invention is designed to cut a yieldable material and particularly a loose mat of uncured oriented strand board. This is achieved by causing blade 10 to be advanced radially into the yieldable oriented strand board such that the outer circumferential rim moves into the yieldahle material until the cutting teeth 22 engage the yieldable material 30, as shown in Figure 5. Alternatively, the critical engagement can result from movement of the work into the blade the axis of which remains stationery. The blade can be rotating as it is advancing into the material 30 or caused to rotate after insertion. Cutting teeth 22 -6- 204i957 are then advanced radially and/or tangentially through the material in a rotary fashion to cut the strand board. When a lull depth cut has been achieved, as shown in Figure 6, the outer circumferential rim 12 acts like a smooth circular disk and rides upon caul or conveyor belt 40 which is carry-ing the strand board. Thus it can be seen that the saw blade will not cut the conveyor belt or caul which is carrying the material since the blade does not have a sharpened outer edge.
As a specific example, an 18 inch diameter saw blade is designed to have a center mounting hole lla of one and 1~/16 inch diameter and corre-sponding side mounting holes of 19/32 inch diameter. The blade thickness is approximately 0.13~5 inches. The scalloped portions 14 define an angle of 24 between the front face 28 of one adjoining tooth 20 and the rear face 29 of the other adjoining tooth 20. The circumferential length of scal-loped portion 14 is approximately .460 inches and the length of depressions 16 on tooth 20 is approximately 0.400 inches. The cutting elements are recessed from outer circumferential rim 12 by 0.015 inches and their side edges extend outwardly 0.035 inches from planar side surfaces 18. All tapers on cutting element 22 are approximately 3 relative to either a tan-gent to the outer circumferential rim or planar side surfaces 18 respectively.
Figure ~ discloses a second embodiment of the present invention.
This embodiment is similar to the first embodiment; therefore, like ele-ments are similarly numl~red in the one hundreds. For e~r~mple, in the first embodiment, 10 refers to the saw blade and in the second embodiment 110 refers to the saw blade.
Referring to Figures 7-9, saw blade 110 is formed of a material such as steel and has planar sides 118. Mounting means 111 includes center mounting hole llla and mounting holes lllb. Outer circumferential rim 112 is formed with scalloped portions 114 which define teeth 120. Depres-sions or relieved portions 116 are spaced inwardly from outer circumferen-tial rim 112. Depressions 116 are adjacent outer circumferential rim 112.
Positioned adjacent depression 116 on each tooth is a cutting element 122 which is similar to cutting element 22. Depression 116 causes cutting ele-ment 122 to be spaced inwardly from outer circumferential rim 112. Thus, _~ _ 7 20~957 inwardly spaced cutting element 122 is prevented from contacting the con-veyor or caul which carries the material to be cut.
Positioned within depression 116 and extending rearwardly and radi-ally outwardly therefrom to the outer circumferential rim 11? is insert or wear strip llS. In a preferred embodiment, insert 115 is a carbide insert;
however, insert llS can be made of other similar wear resistant materials.
Further, in the preferred ernbo~liment~ wear strip llS is designed to extend 0.015 of an inch above the outer circumferential rim to a~so prevent wear of the rim. Insert 115 need not be a separate piece but can be formed inte-grally with saw blade 110 and specially treated to a wear resistant chara~
ter. Hardened steel can be used instead of carbide particularly where the insert is integrally with the blade. Insert 115 contains no sharp edges so that insert llS will not cut the conveyor or caul that carries the yieldable material.
In use, saw blade 110 is caused to rotate and contact a conveyor or caul in order to completely cut through the yiel~lable material. This con-tact causes outer circumferential rim 112 to be worn down if insert 115 is not present. Without the insert, rim 112 can be worn down until cutting element 122 is even with the rim, thus allowing cutting element 122 to cut the conveyor or caul. The second embodiment lengthens the life of the conveyor or caul by preventing a saw blade outer circumferential rim from wearing to the point where the cutting elements cut the conYeyor caul.
Additionally, the wear strips also lengthen the life of the saw blade which without the wear strips would have to be replaced before the rim is worn to the depth of the cutting elements.
The invention has been described in detail in the foregoing descrip-tion with reference to the accompanying drawings. However, the discl~
sure is illustrative only and the invention is not limited to the precise em~odiment illustrated. Various changes and modifications may be made therein by one skilled in the art without departing from the scope or spirit of the invention as defined by the appended claims.
Claims (5)
1. A saw blade for cutting yieldable material resting on a supporting surface without damaging the supporting surface which comprises:
a circular plate member having a non-cutting outer circumferential rim, planar side surfaces and mounting means to connect said plate member to drive means for rotating said saw blade about a central axis;
said plate member having a plurality of scalloped recesses spaced circumferentially around said rim to define therebetween a plurality of teeth having radially outer non-cutting circumferential surfaces spaced around and defining said non-cutting circumferential rim;
each of said teeth having a forward leading surface, a rearward trailing surface and a cutting element on said leading surface, said cutting element having a radially outer surface spaced radially inwardly from said rim and generally radial cutting edges protruding axially outwardly from said planar side surfaces so that said non-cutting circumferential rim may be pressed radially into said yieldable material to bring said cutting edges into cutting relationship with said yieldable material until said non-cutting outer circumferential rim engages but does not cut the supporting surface, each of said teeth having a hardened wear strip defining at least a portion of its outer non-cutting circumferential surface to maintain said cutting elements radially spaced inwardly therefrom.
a circular plate member having a non-cutting outer circumferential rim, planar side surfaces and mounting means to connect said plate member to drive means for rotating said saw blade about a central axis;
said plate member having a plurality of scalloped recesses spaced circumferentially around said rim to define therebetween a plurality of teeth having radially outer non-cutting circumferential surfaces spaced around and defining said non-cutting circumferential rim;
each of said teeth having a forward leading surface, a rearward trailing surface and a cutting element on said leading surface, said cutting element having a radially outer surface spaced radially inwardly from said rim and generally radial cutting edges protruding axially outwardly from said planar side surfaces so that said non-cutting circumferential rim may be pressed radially into said yieldable material to bring said cutting edges into cutting relationship with said yieldable material until said non-cutting outer circumferential rim engages but does not cut the supporting surface, each of said teeth having a hardened wear strip defining at least a portion of its outer non-cutting circumferential surface to maintain said cutting elements radially spaced inwardly therefrom.
2. The saw blade as recited in Claim 1 wherein said wear strip is formed as an insert of a carbide material.
3. The saw blade as recited in Claim 1 wherein said outer surface of each of said cutting element is tapered rearwardly and radially inwardly and joins said saw blade such as to form a depression, spaced radially inwardly from said non-cutting outer circumferential rim.
4. The saw blade as recited in Claim 1 wherein side surfaces of said cutting elements are tapered rearwardly and inwardly towards said planar side surfaces.
5. The saw blade as recited in Claim 1 wherein said cutting elements are formed by carbide inserts.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US54076990A | 1990-06-20 | 1990-06-20 | |
| US709,662 | 1991-06-07 | ||
| US07/709,662 US5129296A (en) | 1990-06-20 | 1991-06-07 | Non-destructive composite material saw blade and method of using same |
| US540,769 | 1995-10-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2044957A1 CA2044957A1 (en) | 1991-12-21 |
| CA2044957C true CA2044957C (en) | 1995-02-14 |
Family
ID=27066519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2044957 Expired - Fee Related CA2044957C (en) | 1990-06-20 | 1991-06-19 | Non-destructive composite material saw blade |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2044957C (en) |
| DE (1) | DE4120190A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR102013017641B1 (en) * | 2013-07-10 | 2022-11-16 | Kampmann Do Brasil Ltda | IMPROVEMENTS INTRODUCED IN THE CUTTING TOOL CIRCULAR SAW BLADE FIXATION OF THE INSERTS IN THE TEETH |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3308703A (en) * | 1965-10-13 | 1967-03-14 | Us Rubber Co | Cutter for grooving rubber |
| US3798767A (en) * | 1972-10-24 | 1974-03-26 | Textile & Ind Sales Inc | Apparatus for cutting flexible material |
| US4133361A (en) * | 1976-02-02 | 1979-01-09 | Woodwork Corporation Of America | Method for machining joints for miters, grooves and other joinery in a beveled or straight panel edge and apparatus for same |
| US4766794A (en) * | 1986-08-25 | 1988-08-30 | Blake Robert A | Rotary saw blade |
-
1991
- 1991-06-19 CA CA 2044957 patent/CA2044957C/en not_active Expired - Fee Related
- 1991-06-19 DE DE19914120190 patent/DE4120190A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE4120190C2 (en) | 1993-06-17 |
| CA2044957A1 (en) | 1991-12-21 |
| DE4120190A1 (en) | 1992-01-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |