CA2612503A1 - Grinding wheel and wheel hub therefore - Google Patents
Grinding wheel and wheel hub therefore Download PDFInfo
- Publication number
- CA2612503A1 CA2612503A1 CA002612503A CA2612503A CA2612503A1 CA 2612503 A1 CA2612503 A1 CA 2612503A1 CA 002612503 A CA002612503 A CA 002612503A CA 2612503 A CA2612503 A CA 2612503A CA 2612503 A1 CA2612503 A1 CA 2612503A1
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- Prior art keywords
- grinding wheel
- face
- grinding
- backing
- wheel hub
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- 230000000994 depressogenic effect Effects 0.000 claims abstract description 21
- 239000007767 bonding agent Substances 0.000 claims abstract description 6
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims 5
- 239000000853 adhesive Substances 0.000 claims 3
- 230000001070 adhesive effect Effects 0.000 claims 3
- 230000013011 mating Effects 0.000 claims 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process 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
- 239000000843 powder Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
- B24D5/16—Bushings; Mountings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
A grinding wheel hub is provided for mounting an abrasive grinding wheel on a grinding apparatus. The hub is adapted for use with an abrasive grinding wheel of the type that has a mounting aperture disposed centrally therein, and a grinding face and a backing face disposed on opposite sides of the abrasive grinding wheel. The grinding wheel hub includes an aperture bushing of substantially cylindrical configuration, adapted for extension through and engagement with the surface of the mounting aperture.
A grinding face fastener is disposed on the aperture bushing and is adapted to extend radially outward from the mounting aperture to engage the grinding face of the wheel. A
backing flange of substantially discoid shape, extends radially outward from the aperture bushing member and is adapted for being superposed with the backing face. The backing flange has a bond surface adapted to face the backing face. The bond surface includes one or more recesses formed therein. Preferably, the recesses have a radial and/or concentric orientation with respect to the center of the aperture bushing.
These recesses are sized and shaped to provide a cavity between the backing flange and the backing face of the grinding wheel when the backing flange is engaged with the backing face. These cavities are adapted to receive a bonding agent therein to bond the grinding wheel hub to the abrasive grinding wheel. The backing flange has a diameter which allows it to terminate in the sloped region of the grinding wheel between the outermost circumference of the substantially flat depressed center and the substantially flat grinding wheel portion.
A grinding face fastener is disposed on the aperture bushing and is adapted to extend radially outward from the mounting aperture to engage the grinding face of the wheel. A
backing flange of substantially discoid shape, extends radially outward from the aperture bushing member and is adapted for being superposed with the backing face. The backing flange has a bond surface adapted to face the backing face. The bond surface includes one or more recesses formed therein. Preferably, the recesses have a radial and/or concentric orientation with respect to the center of the aperture bushing.
These recesses are sized and shaped to provide a cavity between the backing flange and the backing face of the grinding wheel when the backing flange is engaged with the backing face. These cavities are adapted to receive a bonding agent therein to bond the grinding wheel hub to the abrasive grinding wheel. The backing flange has a diameter which allows it to terminate in the sloped region of the grinding wheel between the outermost circumference of the substantially flat depressed center and the substantially flat grinding wheel portion.
Description
GRINDING WHEEL AND WHEEL HUB THEREFORE
Background of the Invention:
Field of the Invention This invention relates to abrasive grinding and cutting wheels, and more particularly to an improved wheel hub for mounting a grinding or cutting wheel to a grinding or cutting apparatus.
Background of the Invention Grinding machines that utilize abrasive grinding wheels mounted thereon may be employed to perform many distinct grinding operations. The varied operations have led to the development of a wide variety of grinding wheel shapes and sizes. One type of grinding wheel in particular is the depressed center wheel, characterized by the central portion of the wheel being offset in the axial direction from the wheel periphery. The wheel thus has a concavo-convex stub portion in which a grinding face has a depressed or concave central portion. This design allows a user to perform face grinding operations using the grinding face having the depressed center portion. Often, such operations are performed on metal, masonry or concrete surfaces and the like, using portable grinding machines. Depressed center wheels are classified by the American National Standards Institute (ANSI) as Type 27 and 28 grinding wheels.
The means by which a grinding wheel is secured to the grinding machine spindle is particularly important with a depressed center wheel. In general, the mounting means must be capable of holding the wheel perpendicular to the spindle during grinding operations, and must provide support to the wheel to distribute stresses away from the central mounting aperture, where stresses tend to concentrate. The mounting means also must be firmly secured to the abrasive wheel, to prevent any slippage therebetween. In addition, the mounting means for Types 27 and 28 wheels have generally been provided with extra support to the wheel periphery, as well as to the central portion of the backing (non-grinding) face of the wheel to resist the additional stresses imposed by face grinding operations.
To satisfy these requirements, it is common to provide Type 27 and 28 wheels with a hub having a flange that extends over the central raised portion, the concavo-convex stub portion, and onto and in contact with the peripheral portion of the wheel, to resist side pressure or otherwise uneven force applied to the grinding face of the wheel.
The opposite face of the wheel is provided with a flange contained completely within the depressed area thereof. An example of such a hub construction is disclosed in U.S. Patent 4,541,205 ('205), which is assigned to the assignee hereof and incorporated herein by reference thereto.
Although such hub constructions may produce satisfactory results in many instances, it is not without drawbacks. In particular, extension of the flange beyond the raised stub portion of the backing face tends to limit the useful life of the wheel. In this regard, the wheel must be replaced before it is ground down to the diameter of the backing flange to avoid potentially damaging contact between the backing flange and the work piece. Accordingly, grinding wheels that utilize this hub construction tend to be discarded with a substantial portion of valuable and otherwise usable abrasive remaining thereon. Such relative under-utilization of the wheel tends to add undesirable expense to grinding operations in terms of both wheel cost and labor costs associated with the frequency of wheel removal and installation.
An attempt at solving the foregoing problem is disclosed in U.S. Patent 5,895,317 ('317). The '317 patent discloses a grinding wheel hub for mounting an abrasive grinding wheel on a grinding apparatus. The hub is adapted for use with an abrasive grinding wheel of the type that has a mounting aperture disposed centrally therein, and a grinding face and a backing face disposed on opposite sides of the abrasive grinding wheel. The grinding wheel hub includes an aperture bushing of substantially cylindrical configuration, adapted for extension through and engagement with the surface of the mounting aperture. A grinding face fastener is disposed on the aperture bushing and adapted to extend radially outward from the mounting aperture to engage the grinding face of the wheel. A backing flange of substantially discoid shape, extends radially outward from the aperture bushing member and is adapted for being superposed with the backing face. An annular engagement surface is located along a periphery of the backing flange and is adapted to engage the backing face of the wheel. The backing flange has a bond surface adapted to face the backing face, and is sized and shaped to provide a cavity between the backing flange and the backing face of the grinding wheel when the annular engagement surface is engaged with the backing face. The cavity is adapted to receive a bonding agent therein to bond the grinding wheel.
However, the grinding wheel hub of the '317 patent also has certain drawbacks and deficiencies. For example, the hub of the '317 patent requires an annular engagement surface which must mate with the grinding wheel to form the bonding cavity.
However, any gaps in this engagement due to problems with manufacturing tolerances can cause leakage of the bonding material from the cavity. In addition, the hub of the '317 patent cannot extend beyond the outermost circumference of the backing face of the wheel thus leading to a less optimal degree of support relative to a hub which does extend beyond the outermost circumference. Thus, there continues to be a need for improved grinding wheel hubs and grinding wheels incorporating such hubs for use with depressed center and other grinding wheels.
Summary of the Invention:
The above-discussed and other drawbacks and deficiencies of the prior art are overcome or alleviated by the improved grinding wheel hub and grinding wheel incorporating such hub of the present invention.
In accordance with the present invention, a grinding wheel hub is provided for mounting an abrasive grinding wheel on a grinding apparatus. The hub is adapted for use with an abrasive grinding wheel of the type that has a mounting aperture disposed centrally therein, and a grinding face and a backing face disposed on opposite sides of the abrasive grinding wheel. The grinding wheel hub includes an aperture bushing of substantially cylindrical configuration, adapted for extension through and engagement with the surface of the mounting aperture. A grinding face fastener is disposed on the aperture bushing and adapted to extend radially outward from the mounting aperture to engage the grinding face of the wheel. A backing flange of substantially discoid shape, extends radially outward from the aperture bushing member and is adapted for being superposed with the backing face. The backing flange has a bond surface adapted to face the backing face. The bond surface includes at least one recess formed therein.
Background of the Invention:
Field of the Invention This invention relates to abrasive grinding and cutting wheels, and more particularly to an improved wheel hub for mounting a grinding or cutting wheel to a grinding or cutting apparatus.
Background of the Invention Grinding machines that utilize abrasive grinding wheels mounted thereon may be employed to perform many distinct grinding operations. The varied operations have led to the development of a wide variety of grinding wheel shapes and sizes. One type of grinding wheel in particular is the depressed center wheel, characterized by the central portion of the wheel being offset in the axial direction from the wheel periphery. The wheel thus has a concavo-convex stub portion in which a grinding face has a depressed or concave central portion. This design allows a user to perform face grinding operations using the grinding face having the depressed center portion. Often, such operations are performed on metal, masonry or concrete surfaces and the like, using portable grinding machines. Depressed center wheels are classified by the American National Standards Institute (ANSI) as Type 27 and 28 grinding wheels.
The means by which a grinding wheel is secured to the grinding machine spindle is particularly important with a depressed center wheel. In general, the mounting means must be capable of holding the wheel perpendicular to the spindle during grinding operations, and must provide support to the wheel to distribute stresses away from the central mounting aperture, where stresses tend to concentrate. The mounting means also must be firmly secured to the abrasive wheel, to prevent any slippage therebetween. In addition, the mounting means for Types 27 and 28 wheels have generally been provided with extra support to the wheel periphery, as well as to the central portion of the backing (non-grinding) face of the wheel to resist the additional stresses imposed by face grinding operations.
To satisfy these requirements, it is common to provide Type 27 and 28 wheels with a hub having a flange that extends over the central raised portion, the concavo-convex stub portion, and onto and in contact with the peripheral portion of the wheel, to resist side pressure or otherwise uneven force applied to the grinding face of the wheel.
The opposite face of the wheel is provided with a flange contained completely within the depressed area thereof. An example of such a hub construction is disclosed in U.S. Patent 4,541,205 ('205), which is assigned to the assignee hereof and incorporated herein by reference thereto.
Although such hub constructions may produce satisfactory results in many instances, it is not without drawbacks. In particular, extension of the flange beyond the raised stub portion of the backing face tends to limit the useful life of the wheel. In this regard, the wheel must be replaced before it is ground down to the diameter of the backing flange to avoid potentially damaging contact between the backing flange and the work piece. Accordingly, grinding wheels that utilize this hub construction tend to be discarded with a substantial portion of valuable and otherwise usable abrasive remaining thereon. Such relative under-utilization of the wheel tends to add undesirable expense to grinding operations in terms of both wheel cost and labor costs associated with the frequency of wheel removal and installation.
An attempt at solving the foregoing problem is disclosed in U.S. Patent 5,895,317 ('317). The '317 patent discloses a grinding wheel hub for mounting an abrasive grinding wheel on a grinding apparatus. The hub is adapted for use with an abrasive grinding wheel of the type that has a mounting aperture disposed centrally therein, and a grinding face and a backing face disposed on opposite sides of the abrasive grinding wheel. The grinding wheel hub includes an aperture bushing of substantially cylindrical configuration, adapted for extension through and engagement with the surface of the mounting aperture. A grinding face fastener is disposed on the aperture bushing and adapted to extend radially outward from the mounting aperture to engage the grinding face of the wheel. A backing flange of substantially discoid shape, extends radially outward from the aperture bushing member and is adapted for being superposed with the backing face. An annular engagement surface is located along a periphery of the backing flange and is adapted to engage the backing face of the wheel. The backing flange has a bond surface adapted to face the backing face, and is sized and shaped to provide a cavity between the backing flange and the backing face of the grinding wheel when the annular engagement surface is engaged with the backing face. The cavity is adapted to receive a bonding agent therein to bond the grinding wheel.
However, the grinding wheel hub of the '317 patent also has certain drawbacks and deficiencies. For example, the hub of the '317 patent requires an annular engagement surface which must mate with the grinding wheel to form the bonding cavity.
However, any gaps in this engagement due to problems with manufacturing tolerances can cause leakage of the bonding material from the cavity. In addition, the hub of the '317 patent cannot extend beyond the outermost circumference of the backing face of the wheel thus leading to a less optimal degree of support relative to a hub which does extend beyond the outermost circumference. Thus, there continues to be a need for improved grinding wheel hubs and grinding wheels incorporating such hubs for use with depressed center and other grinding wheels.
Summary of the Invention:
The above-discussed and other drawbacks and deficiencies of the prior art are overcome or alleviated by the improved grinding wheel hub and grinding wheel incorporating such hub of the present invention.
In accordance with the present invention, a grinding wheel hub is provided for mounting an abrasive grinding wheel on a grinding apparatus. The hub is adapted for use with an abrasive grinding wheel of the type that has a mounting aperture disposed centrally therein, and a grinding face and a backing face disposed on opposite sides of the abrasive grinding wheel. The grinding wheel hub includes an aperture bushing of substantially cylindrical configuration, adapted for extension through and engagement with the surface of the mounting aperture. A grinding face fastener is disposed on the aperture bushing and adapted to extend radially outward from the mounting aperture to engage the grinding face of the wheel. A backing flange of substantially discoid shape, extends radially outward from the aperture bushing member and is adapted for being superposed with the backing face. The backing flange has a bond surface adapted to face the backing face. The bond surface includes at least one recess formed therein.
Preferably, the recess has a radial and/or concentric orientation with respect to the center of the aperture bushing. This recess is sized and shaped to provide a cavity between the backing flange and the backing face of the grinding wheel when the backing flange is engaged with the backing face. This cavity is adapted to receive a bonding agent therein to bond the grinding wheel hub to the abrasive grinding wheel.
Significantly, the at least one recess and resultant cavities formed therefrom avoids the necessity of an annular engagement surface as was required in the prior art hub of the aforementioned '317 patent. The lack of any annular engagement surface (and the need for strict tolerances associated therewith) represents an improvement over the hub of the '317 patent.
The backing flange of the present invention has a diameter which allows it to terminate in the sloped region of the grinding wheel between the outermost circumference of the substantially flat depressed center and the substantially flat grinding wheel portion. This feature provides for maximum support of the grinding wheel while still avoiding any limitation to the useful life of the wheel. Additionally, this feature protects the concavo-convex portion of the wheel from possible damage by the material being cut. Hence, this feature provides yet another improvement relative to the grinding wheel hub of the aforementioned '317 patent.
The above-discussed and other features and advantages of the present invention will be appreciated by and understood by those skilled in the art from the following detailed description and drawings.
Description of the Drawings:
Referring now to the drawings, wherein like elements are numbered alike in the several FIGURES:
FIGURE 1 is a top plan view of the grinding wheel hub in accordance with the present invention;
FIGURE 2 is a bottom plan view of the hub of FIGURE 1;
FIGURE 3 is a cross-sectional elevation view along the line 3-3 of FIGURE 2;
FIGURE 4 is a cross-sectional elevation view along the line 4-4 of FIGURE 2;
Significantly, the at least one recess and resultant cavities formed therefrom avoids the necessity of an annular engagement surface as was required in the prior art hub of the aforementioned '317 patent. The lack of any annular engagement surface (and the need for strict tolerances associated therewith) represents an improvement over the hub of the '317 patent.
The backing flange of the present invention has a diameter which allows it to terminate in the sloped region of the grinding wheel between the outermost circumference of the substantially flat depressed center and the substantially flat grinding wheel portion. This feature provides for maximum support of the grinding wheel while still avoiding any limitation to the useful life of the wheel. Additionally, this feature protects the concavo-convex portion of the wheel from possible damage by the material being cut. Hence, this feature provides yet another improvement relative to the grinding wheel hub of the aforementioned '317 patent.
The above-discussed and other features and advantages of the present invention will be appreciated by and understood by those skilled in the art from the following detailed description and drawings.
Description of the Drawings:
Referring now to the drawings, wherein like elements are numbered alike in the several FIGURES:
FIGURE 1 is a top plan view of the grinding wheel hub in accordance with the present invention;
FIGURE 2 is a bottom plan view of the hub of FIGURE 1;
FIGURE 3 is a cross-sectional elevation view along the line 3-3 of FIGURE 2;
FIGURE 4 is a cross-sectional elevation view along the line 4-4 of FIGURE 2;
FIGURE 5 is a cross-sectional elevation view along the line 5-5 of FIGURE 2;
and FIGURE 6 is a cross-sectional elevation view showing the hub of FIGURE 3 incorporated with a grinding wheel.
Description of the Preferred Embodiment:
For definitional purposes, throughout this disclosure, the terms "axial" and "co-axial" shall refer to a direction substantially parallel to the axis rotation of wheel hub 10 and/or grinding wheel 12. The terms "transverse" and "radial" shall refer to directions substantially orthogonal to the axial or co-axial direction.
Referring now to the drawings, as shown in FIGURES 4 and 6, aperture bushing 14 is substantially cylindrical, extending from grinding face end 16 to backing face end 18 (FIGURE 3). Backing face end 18 is provided with a hex head 20. A central bore 22 extends axially along the length of the bushing. The bushing has a predetermined outer diameter sufficient to enable grinding face end 16 of bushing 14 to be slidably received within central aperture 24 of grinding wheel 12 (FIGURE 6). Central bore 22 and hex head 20 facilitate fastening wheel hub 10 to a conventional grinding apparatus (not shown) in a manner familiar to one skilled in the art.
Disc shaped flange 26 extends radially from a medial portion of bushing 14 and terminates at peripheral lip 28. Referring now to FIGURES 2, 3, and 6, the lower surface of the disc shaped flange 26 includes a recess 32. This recess 32 may have any appropriate shape and/or volume such that when the flange 26 is mated with the grinding wheel 12, a cavity 34 is formed (see FIGURE 6) for receiving an appropriate bonding material. In the particular embodiment disclosed herein, recess 32 has a generally 25 annular shape defined by an inner diameter wa1136 and an outer diameter wa1138. The outer diameter wall 38 has a series of spaced arcuate sections 40. Recess 32 additionally includes two "T" shaped raised regions 42 with a pair of smaller raised regions 44 between each raised region 42.
Each raised region 42 includes an optioned rectangularly shaped further extension 30 46. Extensions 46 cooperate to define a key and are substantially identical to the keys 46 disclosed in the aforementioned '205 patent. The keys 46 function in the same manner as disclosed in the '205 patent such that the keys 46 mate with a complimentary keyway 47 (see FIGURE 6) in the grinding wheel to form a mechanical interlock to prevent rotation between the hub and the grinding wheel.
Referring now to FIGURES 2 and 5, the bottom surface 30 of flange 26 is provided with a series of discontinuities or grooves 48 which serve to increase the surface area of contact with the bonding material. In a preferred embodiment, as shown, discontinuities 48 comprise a series of radially extending groves of substantially V-shaped or saw-tooth cross-section as in FIGURE 5. The grooves are preferably radially spaced about the flange.
Hub 10 may be fabricated from any number of materials capable of providing the requisite structural characteristics, such as, for example, a metallic material or alloy. In a preferred embodiment, hub 10 is fabricated from a zinc alloy.
The hub may be formed by any convenient method, including, for example, casting, forging or powder metal forming. In a preferred embodiment, hub 10 is formed by die casting.
Hub 10 is installed onto wheel 12 by filling cavity 34 with a suitable bonding agent such as an epoxy resin. Grinding face end 16 (FIGURES 3 and 6) of bushing 14 is then inserted into central aperture 24 of wheel 12 until bottom flange surface 30, 42 and 44 engages backing face 50 of the wheel as shown in FIGURE 6. Once so disposed, grinding face end 16, which extends a predetermined distance beyond grinding face 54, is then swaged or flanged in a conventional manner to splay the walls thereof radially outward and form a flange or annular bead 56 as show in FIGURE 6. Bead 56 serves to engage grinding face 54 about the perimeter of central aperture 24 to capture wheel 12 between the bead and flange 26 and thus complete assembly of hub 10 onto wheel 12.
Once sufficient time has elapsed to permit the epoxy resin to cure, the hub and wheel assembly may be utilized in a conventional manner in combination with a grinding apparatus.
As best shown in FIGURE 6, the diameter of flange 26 is configured so as to extend beyond the outermost diameter of the depressed center 60 of wheel 12 and terminate along the sloped region 62 of wheel 12. Termination of flange 26 along the sloped region 62 provides improved support and protection relative to the hub of the '317 patent (where the flange terminates at the periphery of the depressed center).
Specifically, the termination of the flange 26 along the sloped region 62 provides far greater protection to the concavo-convex portion of the grinding or cutting wheel as compared to the '317 patent. This is a significant improvement as the concavo-convex portion of the wheel in the '317 patent is exposed and therefore susceptible to damage, i.e., it can be cut by the material as the wheel works its way through the material.
Moreover, by terminating at the sloped region 62, the hub avoids any interference with the grinding face of wheel 12.as was common with, for example, the hub of the '205 patent.
Still referring to FIGURE 6, peripheral lip 28 is configured so as to form a gap 64 relative to sloped region 62. This gap allows for looser tolerances than is required by the annular engagement surface of the '317 patent.
It will be appreciated that there are many physical points of contact between the hub 10 and wheel 12. During the application of the hub, the rollover process preferably used to secure the hub places great pressure on the center of the wheel. The presence of the many physical points of contact helps to alleviate or eliminate stress on the center portion of the depressed center and minimizes the possibility of distortion or damage to the wheel during this rollover process.
Although the grinding wheel hub of the subject invention has been shown and described in combination with depressed center grinding wheels, one skilled in the art should recognize that the hub may be utilized in combination with grinding wheels of substantially any configuration, including, but not limited to, dish wheels, recessed wheels, Type 27 and 28 wheels, or any other grinding wheel having a depressed center and a central mounting aperture, without departing from the spirit and scope of the subject invention.
While preferred embodiments have been shown and described, various modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustration and not limitation.
and FIGURE 6 is a cross-sectional elevation view showing the hub of FIGURE 3 incorporated with a grinding wheel.
Description of the Preferred Embodiment:
For definitional purposes, throughout this disclosure, the terms "axial" and "co-axial" shall refer to a direction substantially parallel to the axis rotation of wheel hub 10 and/or grinding wheel 12. The terms "transverse" and "radial" shall refer to directions substantially orthogonal to the axial or co-axial direction.
Referring now to the drawings, as shown in FIGURES 4 and 6, aperture bushing 14 is substantially cylindrical, extending from grinding face end 16 to backing face end 18 (FIGURE 3). Backing face end 18 is provided with a hex head 20. A central bore 22 extends axially along the length of the bushing. The bushing has a predetermined outer diameter sufficient to enable grinding face end 16 of bushing 14 to be slidably received within central aperture 24 of grinding wheel 12 (FIGURE 6). Central bore 22 and hex head 20 facilitate fastening wheel hub 10 to a conventional grinding apparatus (not shown) in a manner familiar to one skilled in the art.
Disc shaped flange 26 extends radially from a medial portion of bushing 14 and terminates at peripheral lip 28. Referring now to FIGURES 2, 3, and 6, the lower surface of the disc shaped flange 26 includes a recess 32. This recess 32 may have any appropriate shape and/or volume such that when the flange 26 is mated with the grinding wheel 12, a cavity 34 is formed (see FIGURE 6) for receiving an appropriate bonding material. In the particular embodiment disclosed herein, recess 32 has a generally 25 annular shape defined by an inner diameter wa1136 and an outer diameter wa1138. The outer diameter wall 38 has a series of spaced arcuate sections 40. Recess 32 additionally includes two "T" shaped raised regions 42 with a pair of smaller raised regions 44 between each raised region 42.
Each raised region 42 includes an optioned rectangularly shaped further extension 30 46. Extensions 46 cooperate to define a key and are substantially identical to the keys 46 disclosed in the aforementioned '205 patent. The keys 46 function in the same manner as disclosed in the '205 patent such that the keys 46 mate with a complimentary keyway 47 (see FIGURE 6) in the grinding wheel to form a mechanical interlock to prevent rotation between the hub and the grinding wheel.
Referring now to FIGURES 2 and 5, the bottom surface 30 of flange 26 is provided with a series of discontinuities or grooves 48 which serve to increase the surface area of contact with the bonding material. In a preferred embodiment, as shown, discontinuities 48 comprise a series of radially extending groves of substantially V-shaped or saw-tooth cross-section as in FIGURE 5. The grooves are preferably radially spaced about the flange.
Hub 10 may be fabricated from any number of materials capable of providing the requisite structural characteristics, such as, for example, a metallic material or alloy. In a preferred embodiment, hub 10 is fabricated from a zinc alloy.
The hub may be formed by any convenient method, including, for example, casting, forging or powder metal forming. In a preferred embodiment, hub 10 is formed by die casting.
Hub 10 is installed onto wheel 12 by filling cavity 34 with a suitable bonding agent such as an epoxy resin. Grinding face end 16 (FIGURES 3 and 6) of bushing 14 is then inserted into central aperture 24 of wheel 12 until bottom flange surface 30, 42 and 44 engages backing face 50 of the wheel as shown in FIGURE 6. Once so disposed, grinding face end 16, which extends a predetermined distance beyond grinding face 54, is then swaged or flanged in a conventional manner to splay the walls thereof radially outward and form a flange or annular bead 56 as show in FIGURE 6. Bead 56 serves to engage grinding face 54 about the perimeter of central aperture 24 to capture wheel 12 between the bead and flange 26 and thus complete assembly of hub 10 onto wheel 12.
Once sufficient time has elapsed to permit the epoxy resin to cure, the hub and wheel assembly may be utilized in a conventional manner in combination with a grinding apparatus.
As best shown in FIGURE 6, the diameter of flange 26 is configured so as to extend beyond the outermost diameter of the depressed center 60 of wheel 12 and terminate along the sloped region 62 of wheel 12. Termination of flange 26 along the sloped region 62 provides improved support and protection relative to the hub of the '317 patent (where the flange terminates at the periphery of the depressed center).
Specifically, the termination of the flange 26 along the sloped region 62 provides far greater protection to the concavo-convex portion of the grinding or cutting wheel as compared to the '317 patent. This is a significant improvement as the concavo-convex portion of the wheel in the '317 patent is exposed and therefore susceptible to damage, i.e., it can be cut by the material as the wheel works its way through the material.
Moreover, by terminating at the sloped region 62, the hub avoids any interference with the grinding face of wheel 12.as was common with, for example, the hub of the '205 patent.
Still referring to FIGURE 6, peripheral lip 28 is configured so as to form a gap 64 relative to sloped region 62. This gap allows for looser tolerances than is required by the annular engagement surface of the '317 patent.
It will be appreciated that there are many physical points of contact between the hub 10 and wheel 12. During the application of the hub, the rollover process preferably used to secure the hub places great pressure on the center of the wheel. The presence of the many physical points of contact helps to alleviate or eliminate stress on the center portion of the depressed center and minimizes the possibility of distortion or damage to the wheel during this rollover process.
Although the grinding wheel hub of the subject invention has been shown and described in combination with depressed center grinding wheels, one skilled in the art should recognize that the hub may be utilized in combination with grinding wheels of substantially any configuration, including, but not limited to, dish wheels, recessed wheels, Type 27 and 28 wheels, or any other grinding wheel having a depressed center and a central mounting aperture, without departing from the spirit and scope of the subject invention.
While preferred embodiments have been shown and described, various modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustration and not limitation.
Claims (16)
- CLAIM 1. A grinding wheel hub for mounting an abrasive grinding wheel having a depressed center on a grinding apparatus, the abrasive grinding wheel having a grinding face and a backing face disposed on opposite sides of the abrasive grinding wheel, the grinding wheel having three sections including a substantially flat depressed center section, a substantially flat grinding wheel section, and a sloped transition section therebetween, the substantially flat, depressed center having a mounting aperture disposed centrally within the depressed center, said grinding wheel hub comprising;
an aperture bushing of substantially cylindrical configuration adapted for co-axial extension through and engagement with the surface of the mounting aperture;
a grinding face fastener disposed on said aperture bushing and adapted to engage the grinding face of the wheel;
a backing flange extending substantially radially outward from said aperture bushing, and adapted for superposed alignment with the backing face, said backing flange terminating at a lip and, said backing flange having a substantially concave surface adapted to face the backing face; and wherein said lip of said backing flange is adapted to terminate along the backing face of the wheel proximate the sloped transition section. - CLAIM 2. The grinding wheel hub as set forth in claim 1, wherein:
the backing flange has a bond surface adapted to face the backing face; and said bond surface is sized and shaped to provide a cavity between said backing flange and the backing face of the grinding wheel when said backing flange is engaged with the backing face, the cavity being adapted for receipt of a bonding agent therein to bond said grinding wheel hub to the abrasive grinding wheel. - CLAIM 3. The grinding wheel hub as set forth in claim 1, wherein said grinding face fastener comprises a grinding face end of said aperture bushing, said grinding face end adapted for being flanged radially outward from the mounting aperture to engage the grinding face.
- CLAIM 4. The grinding wheel hub as set forth in claim 1, wherein said lip is adapted to be spaced from the sloped transition section so as to form a gap.
- CLAIM 5. The grinding wheel hub as set forth in claim 4, wherein said backing flange and said lip define said substantially concave surface.
- CLAIM 6. The grinding wheel hub as set forth in claim 5, wherein the cavity is defined by a recess in said aperture bushing member, in combination with the backing face of the abrasive grinding wheel.
- CLAIM 7. The grinding wheel hub as set forth in claim 6, wherein said recess has an annular shape.
- CLAIM 8. The grinding wheel hub as set forth in claim 2, wherein adhesive is disposed within the cavity to bond the grinding wheel hub to the abrasive grinding wheel.
- CLAIM 9. The grinding wheel hub as set forth in claim 2, wherein said flange further comprises a plurality of surface irregularities adapted to provide a textured surface area for engagement with the adhesive.
- CLAIM 10. The grinding wheel hub as set forth in claim 9, wherein said plurality of surface irregularities comprises a plurality of grooves extending radially from said aperture.
- CLAIM 11. The grinding wheel hub as set forth in claim 1, wherein the abrasive grinding wheel comprises an ANSI Type 27 or Type 28 wheel.
- CLAIM 12. The grinding wheel hub as set forth in claim 8, wherein the adhesive is an epoxy resin.
- CLAIM 13. The grinding wheel hub as set forth in claim 1, including at least one key extending from said backing flange.
- CLAIM 14. A grinding wheel assembly adapted for being mounted on a grinding apparatus, comprising:
an abrasive grinding wheel having three sections including a substantially flat depressed center section, a substantially flat grinding wheel section and a sloped transition section therebetween, the depressed center having a mounting aperture disposed centrally therewithin, and a grinding face and a backing face disposed on opposite sides of the abrasive wheel;
the grinding wheel hub of claim 1; and a bonding agent between the backing face and the wheel hub. - CLAIM 15. The grinding wheel assembly as set forth in claim 14, including:
at least one key extending from the grinding wheel hub; and at least one mating keyway in the depressed center section of the grinding wheel for mechanically interlocking with the key and preventing rotation between the hub and the grinding wheel. - CLAIM 16. The grinding wheel assembly as set forth in claim 14, wherein said lip is adapted to be spaced from the sloped transition section so as to form a gap.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/633,365 US20080132158A1 (en) | 2006-12-04 | 2006-12-04 | Grinding wheel and wheel hub therefore |
| US11/633,365 | 2006-12-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2612503A1 true CA2612503A1 (en) | 2008-06-04 |
Family
ID=39476388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002612503A Abandoned CA2612503A1 (en) | 2006-12-04 | 2007-11-27 | Grinding wheel and wheel hub therefore |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US20080132158A1 (en) |
| CA (1) | CA2612503A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009044857A1 (en) * | 2009-12-10 | 2011-06-16 | Rolf Tamm | Arrangement for grinding electrodes and grinding wheel |
| US11123843B2 (en) | 2017-05-23 | 2021-09-21 | General Tool, Inc. | Depth adjustable hub for use with abrasive grinding tool |
| CN108890416A (en) * | 2018-05-29 | 2018-11-27 | 张秀英 | One kind being used for the old wheel hub recycling and reusing process equipment of automobile |
| CN110883708B (en) * | 2019-11-29 | 2021-10-01 | 宁波江北金光磨具有限公司 | Preparation method of abrasive disc |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2149645A (en) * | 1937-04-28 | 1939-03-07 | Cleveland Pneumatic Tool Co | Governor for fluid motors |
| US2259345A (en) * | 1940-09-09 | 1941-10-14 | Raybestos Manhattan Inc | Abrasive wheel and reinforcing mounting |
| US2308472A (en) * | 1941-02-24 | 1943-01-12 | Us Electrical Tool Company | Valve seat grinding device |
| US2726493A (en) * | 1953-12-15 | 1955-12-13 | Us Rubber Co | Grinding wheel manufacture |
| US3136100A (en) * | 1962-07-11 | 1964-06-09 | Norton Co | Grinding wheel |
| US4088729A (en) * | 1971-01-22 | 1978-05-09 | Sherman William F | Method of bonding a phenol-based thermoplastic resin to a cured and molded thermoset phenolic plastic |
| US3889430A (en) * | 1972-05-17 | 1975-06-17 | S P A M | Abrasive tools |
| US4015371A (en) * | 1976-04-08 | 1977-04-05 | Machinery Brokers, Inc. | Grinding wheel assembly |
| US4240230A (en) * | 1979-01-24 | 1980-12-23 | The Carborundum Company | Throw-away adaptors for grinding wheels |
| US4541205A (en) * | 1983-04-08 | 1985-09-17 | United Abrasives, Inc. | Abrasive wheel assembly |
| US4899494A (en) * | 1986-04-03 | 1990-02-13 | Mackay Joseph H Jun | Finishing article having an integral mounting hub and improved base |
| US4979336A (en) * | 1986-04-03 | 1990-12-25 | Mackay Joseph H Jun | Disposable finishing article having an integral mounting hub including an improved metal pressure cap |
| US4774788A (en) * | 1986-05-06 | 1988-10-04 | Camel Grinding Wheel Works, Sarid Ltd. | Grinding wheel with a single-piece hub |
| DE4129090A1 (en) * | 1991-09-02 | 1993-03-04 | Rueggeberg August Fa | GRINDING WHEEL |
| US5431596A (en) * | 1993-04-28 | 1995-07-11 | Akita; Hiroshi | Grinding wheel and a method for manufacturing the same |
| US5538464A (en) * | 1994-08-15 | 1996-07-23 | Mackay, Jr.; Joseph H. | Disposable abrasive wheel having disposable mounting hub including improved metal pressure cap and method of manufacturing the same |
| US5718621A (en) * | 1996-09-11 | 1998-02-17 | Turley; Edward Michael | Reversible angle grinder with top arbour lock |
| US5895317A (en) * | 1996-12-18 | 1999-04-20 | Norton Company | Wheel hub for longer wheel life |
| US7056200B2 (en) * | 2001-09-04 | 2006-06-06 | 3M Innovative Properties Company | Quick change connector for grinding wheel |
-
2006
- 2006-12-04 US US11/633,365 patent/US20080132158A1/en not_active Abandoned
-
2007
- 2007-11-27 CA CA002612503A patent/CA2612503A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20080132158A1 (en) | 2008-06-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |
Effective date: 20131127 |