CA2185630C - Saw arbor with splined mandrel and mating, timed internally and externally splined saw blade mounting sleeve - Google Patents
Saw arbor with splined mandrel and mating, timed internally and externally splined saw blade mounting sleeve Download PDFInfo
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- CA2185630C CA2185630C CA002185630A CA2185630A CA2185630C CA 2185630 C CA2185630 C CA 2185630C CA 002185630 A CA002185630 A CA 002185630A CA 2185630 A CA2185630 A CA 2185630A CA 2185630 C CA2185630 C CA 2185630C
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- 230000013011 mating Effects 0.000 title claims abstract description 13
- 238000005520 cutting process Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 11
- 238000003698 laser cutting Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 206010052804 Drug tolerance Diseases 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241000542980 Mimidae Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000000887 face Anatomy 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
- B27B5/29—Details; Component parts; Accessories
- B27B5/30—Details; Component parts; Accessories for mounting or securing saw blades or saw spindles
- B27B5/32—Devices for securing circular saw blades to the saw spindle
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Drilling Tools (AREA)
Abstract
A saw arbor formed of a mandrel and a cylindrically apertured sleeve. Radially spaced splines are provided around the mandrel's outer circumference and around the inner circumference of the sleeve aperture. The mandrel splines and the sleeve aperture splines are shaped and sized for slidable mating engagement of the mandrel splines with the aperture splines. Radially spaced splines are also provided around the sleeve's outer circumference.
The sleeve outer circumference splines are shaped and sized for slidable mating engagement with further splines spaced radially around a saw blade eye. Equal numbers of equally spaced involute splines are preferably provided around the mandrel, around the inner circumference of the sleeve aperture and around the sleeve's outer circumference. The splines can be formed to achieve 0.001" tolerance engagement between the mandrel and the sleeve, and between the sleeve's outer circumference and the saw blade eye, thus providing a high precision cutting unit.
The sleeve outer circumference splines are shaped and sized for slidable mating engagement with further splines spaced radially around a saw blade eye. Equal numbers of equally spaced involute splines are preferably provided around the mandrel, around the inner circumference of the sleeve aperture and around the sleeve's outer circumference. The splines can be formed to achieve 0.001" tolerance engagement between the mandrel and the sleeve, and between the sleeve's outer circumference and the saw blade eye, thus providing a high precision cutting unit.
Description
2~s~s3 SAW ARBOR WITH SPLINED MANDREL AND MATING, TIMED INTER-NALLY AND EXTERNALLY SPLINED SAW BLADE MOUNTING SLEEVE
Field of the Invention This application pertains to a saw arbor formed by a splined mandrel slidably mated within a splined saw blade mounting sleeve. Additional splines on the sleeve's outer circumference mate within corresponding splines in a saw blade eye. This yields a balanced, precision tolerance cutting unit which minimizes wear on the saw blade, mandrel and sleeve, while improving sawing accuracy.
Background of the Invention United States Patent No. 3,516,460 Thrasher discloses a saw arbor having a plurality of circumfer entially spaced, parallel, outwardly projecting semi-cylin drical splines. A circular saw blade having a saw eye cut to match the arbor's cross-sectional shape is slidably mounted on the arbor. As the arbor is drivingly rotated, the spline's leading edges tend to make point contact with the lower forward corners of the corresponding semicircu-lar cutouts in the saw eye. This significantly increases wear on the eye, and can ruin the saw blade well before the saw teeth themselves wear out. The arbor's splines also wear at an increased rate, as do the bearings which support the rotating arbor. Further, the saw blade tends to flutter at high speed, resulting in a wider kerf and increased wear on the saw teeth. All of these factors contribute to an increased need for saw blade changes, which is an expensive, labour-intensive operation with attendant loss of lumber production.
Involute-splined saw arbors were developed to overcome the foregoing problems. Involute splines have substantially flat forward, rearward and top faces. Gear cutting techniques are used to maintain the arbor's splines parallel to the arbor's longitudinal axis. As a result, instead of making mere point contact with the saw blade eye, an involute-splined arbor achieves land contact across substantially the entire forward face of each spline. This significantly reduces wear, saw flutter, etc. Further, because the arbor's splines are highly parallel to the arbor's longitudinal axis, the tolerance between the arbor and the saw blade eye may be reduced in order to further reduce wear, flutter, etc.
Prior art saw arbors were of one-piece construc-tion, with the saw blade being mounted over splines formed in the arbor itself. Modern saw arbors have a mandrel on which a cylindrically-apertured sleeve is slidably mounted, with the saw blade being mounted over splines formed around the sleeve' s outer circumference . One or two longitudi-nally extending keyways are machined into the sleeve's aperture. The mandrel has a similar keyway. The keyways are aligned and a steel key is placed in the aligned keyways to position the sleeve relative to the mandrel.
Such arbors are subject to a number of problems.
First, the keyway machining process removes material from the mandrel and from the sleeve. The weight of the removed material is not precisely offset by the key steel driven into the keyway. This results in rotational imbalance, which can degrade sawing accuracy when the arbor and saw blade are driven at high rotational speeds.
A further problem arises upon heat treatment of an arbor having a keyed mandrel and sleeve, namely, "ovality distortion". In particular, such arbors tend to assume an oval (i.e. out of round) cross-sectional shape following heat treating. If the arbor is out of round, then the saw blade eye cannot be formed to achieve a minimum tolerance, orientation-independent, fit on the arbor. Saw blade eyes are conventionally formed using laser cutting techniques. In theory, the laser cutting process can produce a saw eye which will fit over any arbitrarily shaped arbor with minimum tolerance. However, in practice, a saw blade eye produced in this fashion can be mounted on the arbor in only one orientation in order to achieve the minimum tolerance aforesaid. In other orienta-tions the saw eye either will not fit over the arbor at all, or else it fits too loosely, resulting in increased wear, loss of sawing accuracy, etc.
Modern sawmills typically employ many circular saws, each of which undergo frequent saw blade changes. It would be highly impractical to maintain, for each arbor, a separate inventory of blades having eyes machined to fit only that one arbor; and/or to take the time to orient a saw blade's eye to achieve minimum tolerance fit in the one orientation on the one saw arbor for which that blade's eye was formed. Accordingly, in practice, circular saw blade eyes are formed to a loose tolerance, which may be no better than about 0.007" to 0.015". This loose tolerance allows the sawmill workers to fit any blade on any arbor without regard to orientation of the saw eye relative to the arbor. However, a necessary consequence is increased wear and sawing inaccuracy; as discussed above.
A further problem is that heat generated by the laser cutting process hardens the saw blade beyond the acceptable Rockwell hardness threshold. Consequently, after the saw eye is laser cut, the saw blade must be heat treated to reduce its Rockwell hardness. But, the heat treating process unavoidably distorts the shape of the saw blade eye. This is another reason why saw eyes are conven-tionally laser cut to tolerances of no better than about 0.007" to 0.015". If the saw eye were cut to a closer tolerance then distortion introduced during the heat treating process might prevent the saw blade from fitting in any orientation on any arbor.
The present invention eliminates keyways in the splined portions of the arbor; and, minimizes clearance between the saw eye and arbor, irrespective of which saw blade is selected for which arbor, irrespective of the orientation in which a saw blade is mounted on an arbor, and irrespective of distortion introduced by heat treating processes.
Field of the Invention This application pertains to a saw arbor formed by a splined mandrel slidably mated within a splined saw blade mounting sleeve. Additional splines on the sleeve's outer circumference mate within corresponding splines in a saw blade eye. This yields a balanced, precision tolerance cutting unit which minimizes wear on the saw blade, mandrel and sleeve, while improving sawing accuracy.
Background of the Invention United States Patent No. 3,516,460 Thrasher discloses a saw arbor having a plurality of circumfer entially spaced, parallel, outwardly projecting semi-cylin drical splines. A circular saw blade having a saw eye cut to match the arbor's cross-sectional shape is slidably mounted on the arbor. As the arbor is drivingly rotated, the spline's leading edges tend to make point contact with the lower forward corners of the corresponding semicircu-lar cutouts in the saw eye. This significantly increases wear on the eye, and can ruin the saw blade well before the saw teeth themselves wear out. The arbor's splines also wear at an increased rate, as do the bearings which support the rotating arbor. Further, the saw blade tends to flutter at high speed, resulting in a wider kerf and increased wear on the saw teeth. All of these factors contribute to an increased need for saw blade changes, which is an expensive, labour-intensive operation with attendant loss of lumber production.
Involute-splined saw arbors were developed to overcome the foregoing problems. Involute splines have substantially flat forward, rearward and top faces. Gear cutting techniques are used to maintain the arbor's splines parallel to the arbor's longitudinal axis. As a result, instead of making mere point contact with the saw blade eye, an involute-splined arbor achieves land contact across substantially the entire forward face of each spline. This significantly reduces wear, saw flutter, etc. Further, because the arbor's splines are highly parallel to the arbor's longitudinal axis, the tolerance between the arbor and the saw blade eye may be reduced in order to further reduce wear, flutter, etc.
Prior art saw arbors were of one-piece construc-tion, with the saw blade being mounted over splines formed in the arbor itself. Modern saw arbors have a mandrel on which a cylindrically-apertured sleeve is slidably mounted, with the saw blade being mounted over splines formed around the sleeve' s outer circumference . One or two longitudi-nally extending keyways are machined into the sleeve's aperture. The mandrel has a similar keyway. The keyways are aligned and a steel key is placed in the aligned keyways to position the sleeve relative to the mandrel.
Such arbors are subject to a number of problems.
First, the keyway machining process removes material from the mandrel and from the sleeve. The weight of the removed material is not precisely offset by the key steel driven into the keyway. This results in rotational imbalance, which can degrade sawing accuracy when the arbor and saw blade are driven at high rotational speeds.
A further problem arises upon heat treatment of an arbor having a keyed mandrel and sleeve, namely, "ovality distortion". In particular, such arbors tend to assume an oval (i.e. out of round) cross-sectional shape following heat treating. If the arbor is out of round, then the saw blade eye cannot be formed to achieve a minimum tolerance, orientation-independent, fit on the arbor. Saw blade eyes are conventionally formed using laser cutting techniques. In theory, the laser cutting process can produce a saw eye which will fit over any arbitrarily shaped arbor with minimum tolerance. However, in practice, a saw blade eye produced in this fashion can be mounted on the arbor in only one orientation in order to achieve the minimum tolerance aforesaid. In other orienta-tions the saw eye either will not fit over the arbor at all, or else it fits too loosely, resulting in increased wear, loss of sawing accuracy, etc.
Modern sawmills typically employ many circular saws, each of which undergo frequent saw blade changes. It would be highly impractical to maintain, for each arbor, a separate inventory of blades having eyes machined to fit only that one arbor; and/or to take the time to orient a saw blade's eye to achieve minimum tolerance fit in the one orientation on the one saw arbor for which that blade's eye was formed. Accordingly, in practice, circular saw blade eyes are formed to a loose tolerance, which may be no better than about 0.007" to 0.015". This loose tolerance allows the sawmill workers to fit any blade on any arbor without regard to orientation of the saw eye relative to the arbor. However, a necessary consequence is increased wear and sawing inaccuracy; as discussed above.
A further problem is that heat generated by the laser cutting process hardens the saw blade beyond the acceptable Rockwell hardness threshold. Consequently, after the saw eye is laser cut, the saw blade must be heat treated to reduce its Rockwell hardness. But, the heat treating process unavoidably distorts the shape of the saw blade eye. This is another reason why saw eyes are conven-tionally laser cut to tolerances of no better than about 0.007" to 0.015". If the saw eye were cut to a closer tolerance then distortion introduced during the heat treating process might prevent the saw blade from fitting in any orientation on any arbor.
The present invention eliminates keyways in the splined portions of the arbor; and, minimizes clearance between the saw eye and arbor, irrespective of which saw blade is selected for which arbor, irrespective of the orientation in which a saw blade is mounted on an arbor, and irrespective of distortion introduced by heat treating processes.
Summary of the Invention In accordance with the preferred embodiment, the invention provides a saw arbor formed of a mandrel and a cylindrically apertured sleeve. Radially spaced splines are provided around the mandrel's outer circumference and around the inner circumference of the sleeve aperture . The mandrel splines and the sleeve aperture splines are shaped and sized for slidable mating inter-engagement. Radially spaced splines are also provided around the sleeve's outer circum-ference. The sleeve outer circumference splines are shaped and sized for slidable mating engagement with further splines spaced radially around a saw blade eye.
Preferably, equal numbers of equally spaced involute splines are provided around the mandrel, around the inner circumference of the sleeve aperture, around the sleeve's outer circumference and around the saw eye. The splines can be formed to achieve less than 0.005" or even 0.001" tolerance engagement between the mandrel and the sleeve, and between the sleeve' s outer circumference and the saw blade eye, thus providing a high precision cutting unit .
Brief Description of the Drawings Figure lA is a partially fragmented front eleva tion view of a mandrel constructed in accordance with the preferred embodiment of the invention. Figure 1B is a side elevation view of the Figure lA mandrel.
Figure 2A is a cross-sectional front elevation of a saw blade mounting sleeve slidably engageable over the mandrel of Figures lA and 1B. Figure 2B is an end view of the Figure 2A mounting sleeve.
Figures 3A and 3B are similar to Figures 2A and 2B
respectively, but depict a mounting sleeve having a larger outer diameter than the mounting sleeve of Figures 2A and 2B.
Figure 4 is an oblique perspective illustration of a mandrel, saw blade mounting sleeve and saw blade according to the invention.
2~8a~~
Preferably, equal numbers of equally spaced involute splines are provided around the mandrel, around the inner circumference of the sleeve aperture, around the sleeve's outer circumference and around the saw eye. The splines can be formed to achieve less than 0.005" or even 0.001" tolerance engagement between the mandrel and the sleeve, and between the sleeve' s outer circumference and the saw blade eye, thus providing a high precision cutting unit .
Brief Description of the Drawings Figure lA is a partially fragmented front eleva tion view of a mandrel constructed in accordance with the preferred embodiment of the invention. Figure 1B is a side elevation view of the Figure lA mandrel.
Figure 2A is a cross-sectional front elevation of a saw blade mounting sleeve slidably engageable over the mandrel of Figures lA and 1B. Figure 2B is an end view of the Figure 2A mounting sleeve.
Figures 3A and 3B are similar to Figures 2A and 2B
respectively, but depict a mounting sleeve having a larger outer diameter than the mounting sleeve of Figures 2A and 2B.
Figure 4 is an oblique perspective illustration of a mandrel, saw blade mounting sleeve and saw blade according to the invention.
2~8a~~
Figure 5 is an oblique perspective illustration of an assembled saw arbor (with saw blade) according to the invention.
Detailed Description of the Preferred Embodiment Figures lA, 1B, 4 and 5 depict a mandrel 10, one end 12 of which is tapered for mating engagement with a rotational support bearing (not shown). A keyway 14 is machined into the opposite end 16 of mandrel 10 for key-fitted engagement of mandrel 10 with a powered drive shaft (not shown) which rotationally drives mandrel 10 about its longitudinal axis l8. A first plurality of straight, parallel, outwardly projecting involute splines 20 are spaced radially around the central, outer circumference 21 of mandrel 10.
A separate sleeve 22 (Figures 2A, 2B, 4 and 5) is provided. Sleeve 22 has a central, cylindrical aperture 24 having an inner circumference 26. A second plurality of straight, parallel, inwardly projecting involute splines 28 are spaced radially around inner circumference 26, as best seen in Figure 2B. Sleeve 22 also has an outer circumfer-ence 30 around which a third plurality of straight, paral-lel, outwardly projecting involute splines 32 are radially spaced.
Mandrel splines 20 and sleeve aperture splines 28 are respectively shaped and sized for slidable, mating engagement of mandrel splines 20 within sleeve aperture splines 28 to form an arbor, as seen in Figure 5. Outer sleeve splines 32 are respectively shaped and sized for slidable, mating engagement of splines 32 within a fourth plurality of inwardly projecting involute splines 34 spaced radially around the eye 36 of a saw blade 38.
Preferably, equal numbers of splines 20, 28 and 32 are provided in each of the first, second and third pluralities aforesaid. Thus, a variety of different sleeves can be provided, one such example being depicted in Figures 3A and 3B in which reference numerals corresponding ~185~3~
Detailed Description of the Preferred Embodiment Figures lA, 1B, 4 and 5 depict a mandrel 10, one end 12 of which is tapered for mating engagement with a rotational support bearing (not shown). A keyway 14 is machined into the opposite end 16 of mandrel 10 for key-fitted engagement of mandrel 10 with a powered drive shaft (not shown) which rotationally drives mandrel 10 about its longitudinal axis l8. A first plurality of straight, parallel, outwardly projecting involute splines 20 are spaced radially around the central, outer circumference 21 of mandrel 10.
A separate sleeve 22 (Figures 2A, 2B, 4 and 5) is provided. Sleeve 22 has a central, cylindrical aperture 24 having an inner circumference 26. A second plurality of straight, parallel, inwardly projecting involute splines 28 are spaced radially around inner circumference 26, as best seen in Figure 2B. Sleeve 22 also has an outer circumfer-ence 30 around which a third plurality of straight, paral-lel, outwardly projecting involute splines 32 are radially spaced.
Mandrel splines 20 and sleeve aperture splines 28 are respectively shaped and sized for slidable, mating engagement of mandrel splines 20 within sleeve aperture splines 28 to form an arbor, as seen in Figure 5. Outer sleeve splines 32 are respectively shaped and sized for slidable, mating engagement of splines 32 within a fourth plurality of inwardly projecting involute splines 34 spaced radially around the eye 36 of a saw blade 38.
Preferably, equal numbers of splines 20, 28 and 32 are provided in each of the first, second and third pluralities aforesaid. Thus, a variety of different sleeves can be provided, one such example being depicted in Figures 3A and 3B in which reference numerals corresponding ~185~3~
to those adopted in Figures 2A and 2B are utilized, with the addition of the suffix "a". A comparison of Figures 2A, 2B, 3A and 3B will reveal that sleeves 22, 22a have the same internal diameter 40, 40a but have different outer diameters 42, 42a. Further comparison reveals that the number of internal splines 28 on sleeve 22 equals the number of external splines 32 thereon; and, that the number of internal splines 28a on sleeve 22a equals the number of external splines 32a thereon. Both sleeves 22, 22a have equal numbers of internal splines 28, 28a. Thus, either one of sleeves 22, 22a can be slidably mounted on mandrel 10 as aforesaid.
By maintaining equal numbers of equally spaced splines 20, 28, 32, 34 on mandrel 10, sleeve 22 and saw blade 38 the invention facilitates mounting of sleeve 22 in any orientation on mandrel 10; and, mounting of saw blade 38 in any orientation on sleeve 22. It is not necessary to align any particular one of splines 20 with any particular one of splines 28 in mounting sleeve 22 on mandrel 10; nor is it necessary to align any particular one of splines 32 with any particular one of splines 34 in mounting saw blade 38 on sleeve 22. Different (or even multiple) sleeves can easily be mounted on mandrel 10. By using gear cutting techniques to produce splined mandrel 10, splined sleeve 22 and splined saw blade 38, manufacturers can carefully control precision, slidable fitting of these components to achieve a tolerance of .001".
The invention enables a sawmill operator to maximize the lifetime of mandrel 10, sleeve 22 and saw blade 38. A prior art sleeve containing a keyway can be mounted on a mandrel in only two 180° opposed orientations.
However, sleeve-mandrel combinations manufactured in accordance with the invention can be inter-mounted in a number of orientations equal to twice the number of mandrel splines (i.e. any of splines 20 can be oriented adjacent any of splines 28; and, sleeve 22 can be mounted on mandrel 10 in either one of two 180° opposed orientations). Simi-~185~3 -larly, saw blade 38 can be mounted on sleeve 22 in a number of orientations equal to twice the number of splines 28 on sleeve 22.
The absence of any keyways in sleeve 22 dramati-cally reduces susceptibility of sleeve 22 to deformation during the heat treating process. Mandrel 10 also has much reduced susceptibility to heat treatment distortion, because end 16 of mandrel 10 containing keyway 14 is not heat treated. Only the portion of mandrel 10 bearing splines 20 is heat treated. The effect of heat treatment distortion on saw blade 38 can also be dramatically reduced by laser cutting eye 36 to an initial size smaller than the desired final size, then heat treating saw blade 38 to reduce its hardness, and then using internal gear cutting techniques to form eye 36 in the desired final size, with splines 34.
As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifications are possible in the practice of this invention without departing from the spirit or scope thereof. For example, although splines 20, 28, 32, 34 are preferably involute splines, they may instead be straight-sided or other shaped splines, including serrations.
Involute splines are preferred because they provide the aforementioned advantages of land contact and because concentrically rotatable parts inter-mounted with involute splines are self-centering. Accordingly, the scope of the invention is to be construed in accordance with the sub-stance defined by the following claims.
By maintaining equal numbers of equally spaced splines 20, 28, 32, 34 on mandrel 10, sleeve 22 and saw blade 38 the invention facilitates mounting of sleeve 22 in any orientation on mandrel 10; and, mounting of saw blade 38 in any orientation on sleeve 22. It is not necessary to align any particular one of splines 20 with any particular one of splines 28 in mounting sleeve 22 on mandrel 10; nor is it necessary to align any particular one of splines 32 with any particular one of splines 34 in mounting saw blade 38 on sleeve 22. Different (or even multiple) sleeves can easily be mounted on mandrel 10. By using gear cutting techniques to produce splined mandrel 10, splined sleeve 22 and splined saw blade 38, manufacturers can carefully control precision, slidable fitting of these components to achieve a tolerance of .001".
The invention enables a sawmill operator to maximize the lifetime of mandrel 10, sleeve 22 and saw blade 38. A prior art sleeve containing a keyway can be mounted on a mandrel in only two 180° opposed orientations.
However, sleeve-mandrel combinations manufactured in accordance with the invention can be inter-mounted in a number of orientations equal to twice the number of mandrel splines (i.e. any of splines 20 can be oriented adjacent any of splines 28; and, sleeve 22 can be mounted on mandrel 10 in either one of two 180° opposed orientations). Simi-~185~3 -larly, saw blade 38 can be mounted on sleeve 22 in a number of orientations equal to twice the number of splines 28 on sleeve 22.
The absence of any keyways in sleeve 22 dramati-cally reduces susceptibility of sleeve 22 to deformation during the heat treating process. Mandrel 10 also has much reduced susceptibility to heat treatment distortion, because end 16 of mandrel 10 containing keyway 14 is not heat treated. Only the portion of mandrel 10 bearing splines 20 is heat treated. The effect of heat treatment distortion on saw blade 38 can also be dramatically reduced by laser cutting eye 36 to an initial size smaller than the desired final size, then heat treating saw blade 38 to reduce its hardness, and then using internal gear cutting techniques to form eye 36 in the desired final size, with splines 34.
As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifications are possible in the practice of this invention without departing from the spirit or scope thereof. For example, although splines 20, 28, 32, 34 are preferably involute splines, they may instead be straight-sided or other shaped splines, including serrations.
Involute splines are preferred because they provide the aforementioned advantages of land contact and because concentrically rotatable parts inter-mounted with involute splines are self-centering. Accordingly, the scope of the invention is to be construed in accordance with the sub-stance defined by the following claims.
Claims (18)
1. A saw arbor, comprising:
a. a mandrel having a first plurality of splines spaced radially around an outer circumference of said mandrel;
b. a cylindrically apertured sleeve having:
i. a second plurality of splines spaced radially around an inner circumference of said aperture;
ii . a third plurality of splines spaced radially around an outer circumference of said sleeve;
wherein:
c. said mandrel splines and said aperture splines are respectively shaped and sized for slidable mating engagement of said mandrel splines with said aperture splines; and, d. said sleeve outer circumference splines are respectively shaped and sized for slidable mating engagement with a fourth plurality of splines spaced radially around a saw blade eye.
a. a mandrel having a first plurality of splines spaced radially around an outer circumference of said mandrel;
b. a cylindrically apertured sleeve having:
i. a second plurality of splines spaced radially around an inner circumference of said aperture;
ii . a third plurality of splines spaced radially around an outer circumference of said sleeve;
wherein:
c. said mandrel splines and said aperture splines are respectively shaped and sized for slidable mating engagement of said mandrel splines with said aperture splines; and, d. said sleeve outer circumference splines are respectively shaped and sized for slidable mating engagement with a fourth plurality of splines spaced radially around a saw blade eye.
2. A saw arbor as defined in claim 1, wherein said first, second and third pluralities each comprise equal numbers of splines.
3. A saw arbor as defined in claim 2, wherein:
a. said first plurality splines are equally spaced around said outer circumference of said mandrel;
b. said second plurality splines are equally spaced around said inner circumference of said aperture;
and, c. said third plurality splines are equally spaced around said outer circumference of said sleeve.
a. said first plurality splines are equally spaced around said outer circumference of said mandrel;
b. said second plurality splines are equally spaced around said inner circumference of said aperture;
and, c. said third plurality splines are equally spaced around said outer circumference of said sleeve.
4. A saw arbor as defined in claim 3, wherein said fourth plurality splines are equally spaced around said saw eye.
5. A saw arbor as defined in claim 3, wherein said splines are involute splines.
6. A saw arbor as defined in claim 3, wherein:
a. said mandrel splines and said aperture splines are further shaped and sized to achieve 0.001"
tolerance engagement between said mandrel splines and said aperture splines; and, b. said sleeve outer circumference splines are further shaped and sized to achieve 0.001" toler-ance engagement between said sleeve outer circum-ference splines and said saw blade eye splines.
a. said mandrel splines and said aperture splines are further shaped and sized to achieve 0.001"
tolerance engagement between said mandrel splines and said aperture splines; and, b. said sleeve outer circumference splines are further shaped and sized to achieve 0.001" toler-ance engagement between said sleeve outer circum-ference splines and said saw blade eye splines.
7. A saw blade having a saw eye comprising a plurality of splines spaced radially around said eye for mounting on a saw arbor as defined in claim 1.
8. A saw blade as defined in claim 7, wherein said saw eye splines are formed for mounting on said saw arbor to achieve a tolerance of less than .005" between said saw eye and said saw arbor.
9. A saw blade as defined in claim 8, wherein said saw eye splines are involute splines.
10 . A saw blade as defined in claim 7, wherein said saw eye splines are formed for mounting on said saw arbor to a achieve tolerance of .001" between said saw eye and said saw arbor.
11. A saw blade as defined in claim 10, wherein said saw eye splines are involute splines.
12. A method of making a saw blade having a saw eye for mounting on a saw arbor as defined in claim 1, said method comprising the steps of:
a. providing a saw blade blank;
b. laser cutting an initial saw eye in said saw blade blank to form said initial saw eye with an initial size less than a desired final size of said saw eye;
c. heat treating said saw blade to attain a desired hardness in said saw blade; and, d. internal gear cutting said saw eye to said desired final size.
a. providing a saw blade blank;
b. laser cutting an initial saw eye in said saw blade blank to form said initial saw eye with an initial size less than a desired final size of said saw eye;
c. heat treating said saw blade to attain a desired hardness in said saw blade; and, d. internal gear cutting said saw eye to said desired final size.
13. A saw arbor having a mandrel and a plurality of cylindrically apertured keyless sleeves, each one of said sleeves for supporting one or more saw blades, each one of said sleeves longitudinally movable along said mandrel during non-rotation of said mandrel to selectably position said one of said sleeves in a selected position on said mandrel, each one of said saw blades longitudinally movable along said selectably positioned sleeves to selectably position each one of said saw blades in a selected sawing position on one of said sleeves for rotation of said saw blades in said respective sawing positions without longitudinal movement of said sleeves along said mandrel during driven rotation of said mandrel, said saw arbor further comprising:
a. a keyless portion of said mandrel having a first plurality of splines formed integrally with said keyless mandrel portion and circumferentially spaced around an outer circumference of said keyless mandrel portion;
b. each one of said sleeves having:
i. a second plurality of aperture splines formed integrally with said one of said sleeves and spaced circumferentially around an inner circumference of said keyless aperture of said one of said sleeves to substantially inhibit ovality distortion of said keyless aperture of said one of said sleeves; and, ii. a third plurality of heat treated splines formed integrally with said one of said sleeves and spaced circumferentially around an outer circumference of said one of said sleeves;
wherein said mandrel splines and said sleeve aperture splines are respectively shaped and sized for slidable mating engagement of said mandrel splines with said sleeve aperture splines.
a. a keyless portion of said mandrel having a first plurality of splines formed integrally with said keyless mandrel portion and circumferentially spaced around an outer circumference of said keyless mandrel portion;
b. each one of said sleeves having:
i. a second plurality of aperture splines formed integrally with said one of said sleeves and spaced circumferentially around an inner circumference of said keyless aperture of said one of said sleeves to substantially inhibit ovality distortion of said keyless aperture of said one of said sleeves; and, ii. a third plurality of heat treated splines formed integrally with said one of said sleeves and spaced circumferentially around an outer circumference of said one of said sleeves;
wherein said mandrel splines and said sleeve aperture splines are respectively shaped and sized for slidable mating engagement of said mandrel splines with said sleeve aperture splines.
14. A saw arbor as defined in claim 13, wherein said first, second and third pluralities each comprise equal numbers of splines.
15. A saw arbor as defined in claim 14, wherein:
a. said first plurality splines are equally spaced around said outer circumference of said keyless mandrel portion;
b. said second plurality splines are equally spaced around said inner circumference of said keyless aperture of said each one of said sleeves; and, c. said third plurality splines are equally spaced around said outer circumference of said each one of said sleeves.
a. said first plurality splines are equally spaced around said outer circumference of said keyless mandrel portion;
b. said second plurality splines are equally spaced around said inner circumference of said keyless aperture of said each one of said sleeves; and, c. said third plurality splines are equally spaced around said outer circumference of said each one of said sleeves.
16. A saw arbor as defined in claim 15, further comprising one or more of said saw blades, each one of said saw blades having an eye, wherein said sleeve outer circumference splines are respectively shaped and sized for slidable mating engagement with a fourth plurality of splines equally, circumferentially spaced around each one of said eyes.
17. A saw arbor as defined in claim 15, wherein said splines are involute splines.
18. A saw arbor as defined in claim 16, wherein:
a. said mandrel splines and said aperture splines are further shaped and sized to achieve tolerance engagement in the range of .001" to .005" between said mandrel splines and said aperture splines;
and, b. said sleeve outer circumference splines are further shaped and sized to achieve tolerance engagement in the range of .001" to .005" between said sleeve outer circumference splines and said saw blade eye splines.
a. said mandrel splines and said aperture splines are further shaped and sized to achieve tolerance engagement in the range of .001" to .005" between said mandrel splines and said aperture splines;
and, b. said sleeve outer circumference splines are further shaped and sized to achieve tolerance engagement in the range of .001" to .005" between said sleeve outer circumference splines and said saw blade eye splines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002185630A CA2185630C (en) | 1996-09-16 | 1996-09-16 | Saw arbor with splined mandrel and mating, timed internally and externally splined saw blade mounting sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002185630A CA2185630C (en) | 1996-09-16 | 1996-09-16 | Saw arbor with splined mandrel and mating, timed internally and externally splined saw blade mounting sleeve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2185630A1 CA2185630A1 (en) | 1996-10-16 |
| CA2185630C true CA2185630C (en) | 2001-11-27 |
Family
ID=4158918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002185630A Expired - Fee Related CA2185630C (en) | 1996-09-16 | 1996-09-16 | Saw arbor with splined mandrel and mating, timed internally and externally splined saw blade mounting sleeve |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2185630C (en) |
-
1996
- 1996-09-16 CA CA002185630A patent/CA2185630C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2185630A1 (en) | 1996-10-16 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20160916 |