Patent Application
20110089746
The invention pertains to a rotatable cutting tool-tool holder-base assembly, as well as the individual components of the assembly. One typically uses such an assembly in conjunction with the rotatable drum or driven member. The driven member rotates in such a fashion to drive the rotatable cutting tool into earth strata to disintegrate the same into smaller pieces including fine particulates, i.e., cutting debris. Such a rotatable cutting tool-tool holder-base assembly has application in a number of specific environments. One specific environment is mining as a component of a mining machine. Another specific environment is road construction as a component of a road planing machine or a road milling machine.
Mining machines and construction machines (e.g., a road planing machine or road milling machine) are useful in continuous mining or road milling applications to mine or mill earth strata such as, for example, coal, asphalt, concrete and the like. These mining machines and construction machines utilize cutting bit assemblies. Each cutting bit assemblies for continuous mining or road milling applications typically comprises a cutting bit rotatably mounted within a support block. In turn, the support block mounts, typically by welding, on a drum or other body, wherein a suitable power source (or means) drives the drum.
When a number of such support blocks carrying cutting bits are mounted onto a drum, and the drum is driven, the cutting bits will impinge and break up the earth strata into many pieces (i.e., cutting debris). Skilled artisans know the general operation of such a mining machine or construction machine. U.S. Pat. No. 7,144,192 to Holl et al. for a SELF-PROPELLED ROAD MILLING MACHINE, U.S. Pat. No. 7,370,916 to Ley et al. for a REAR LOADER ROAD MILLING MACHINE WITH HEIGHT-ADJUSTABLE SEALING DEVICE, and U.S. Pat. No. 7,070,244 to Fischer et al. for a ROAD MILLING MACHINE are exemplary patent documents that disclose such mining machines and/or construction machines.
During operation of the mining or construction machine, the support block experiences wear due to exposure thereof to the cutting debris. Over time, wear and other kinds of abuse causes the support block to become ineffective which signals an end to its useful life. Once this occurs, the operator must cut or torch the support block off the drum to allow for replacement of the support block. Typically, the operator welds the replacement support block on the drum. As the skilled artisan appreciates, it is time-consuming, and hence costly, to remove and replace a support block. Thus, there is an advantage to be able to prolong the useful life of the support block.
To prolong the life of the support block, one may use a cutting bit holder, sometimes referred to as a cutting bit sleeve, wherein the cutting bit rotatably or otherwise releasably mounts within the cutting bit holder. The cutting bit holder mounts within the support block via a mechanical connection. The presence of the cutting bit holder helps protect the support block from abuse and wear, thus minimizing or eliminating the periods of down time otherwise required for drum repair. The skilled artisan is aware of the use of cutting bit holders.
The skilled artisan is aware that cutting bits and cutting bit holders are subjected to considerable stresses during mining operations, road milling operations or other like operations. Accordingly, there is a desire to mount the cutting bit holder in the support block to minimize movement of the cutting bit holder in order to maximize the useful life of the cutting bit.
It is also important that the mounting between the cutting bit holder and the support block be resistant to vibratory loosening which could likewise lead to premature cutting bit wear and failure. Heretofore, various structures exist to mount a cutting bit sleeve within a support block in an attempt to minimize cutting bit holder movement or loosening, while maximizing cutting bit life.
A mining machine or a road milling machine operates typically in severe operating conditions. During operation, the cutting bit holder (or tool holder) and/or the support block (or base) can experience damage such that it is difficult to disassemble these components. It is an advantage to be able to disassemble the cutting bit holder from the support block. Thus, it would be highly desirable to provide a cutting bit holder-support block assembly that facilitates a relatively easy disassembly of the cutting bit holder from the support block. Further, during operation, the severe operating conditions can also cause the rotatable cutting bit to lodge in the bore of the cutting bit holder. It would be advantageous to disassemble the cutting bit from the cutting bit holder. Thus, it is highly desirable to provide a cutting bit-cutting bit holder assembly that facilitates the relatively easy disassembly of the cutting bit from the cutting bit holder.
The following patent documents are exemplary of these various structures: U.S. Pat. No. 5,067,775 to D'Angelo for RETAINER FOR ROTATABLE BITS; U.S. Pat. No. 6,129,422 to Siddle et al. for a CUTTING TOOL HOLDER RETENTION SYSTEM; U.S. Pat. No. 5,769,505 to Siddle et al. for a CUTTING TOOL HOLDER RETENTION SYSTEM; U.S. Pat. No. 6,220,671 to Montgomery, Jr. for a CUTTING TOOL HOLDER RETENTION SYSTEM; U.S. Pat. No. 6,234,579 to Montgomery, Jr. for a CUTTING TOOL HOLDER RETENTION SYSTEM; U.S. Pat. No. 6,331,035 to Montgomery, Jr. for a CUTTING TOOL HOLDER ASSEMBLY WITH PRESS FIT; U.S. Pat. No. 3,749,449 to Krekeler for a MEANS FOR REMOVABLY AFFIXING CUTTER BIT AND LUG ASSEMBLIES TO DRIVER ELEMENT OF A MINING MACHINE OR THE LIKE; U.S. Pat. No. 4,650,254 to Wechner for a BIT HOLDER; and U.S. Pat. No. 5,607,206 to Siddle et al. for a CUTTING TOOL HOLDER RETENTION SYSTEM.
In one form thereof, the invention is a tool holder-base assembly wherein the base is adapted to attach to a surface of a rotatable driving member. The tool holder-base assembly comprises a base wherein the base contains a tool holder bore, which has a tool holder bore central longitudinal axis. The base further contains an orientation bore, which has an orientation bore central longitudinal axis. The orientation bore opens into the tool holder bore. The orientation bore central longitudinal axis is disposed generally perpendicular to the tool holder bore central longitudinal axis. The assembly further has a tool holder that has a leading head region and a trailing shank region, and a mediate region intermediate of and contiguous with the leading head region and the trailing shank region. The leading head region of the tool holder contains a rotatably cutting tool bore. The trailing shank region contains an orientation slot. The mediate region presents a forward protective surface defining debris diversion surfaces. An orientation pin is received within the orientation bore so as to project into the orientation slot. The orientation pin cooperates with the orientation slot in the holder so the tool holder presents a correct orientation relative to the base.
In another form thereof, the invention is a tool holder-base assembly wherein the base is adapted to attach to a surface of a rotatable driving member. The tool holder-base assembly comprises a base wherein the base has a proximate region and a distal region. The proximate region has a surface that is attachable to the surface of the rotatable driving member. The base contains a tool holder bore that has a tool holder bore central longitudinal axis. The base further contains an orientation bore that has an orientation bore central longitudinal axis. The orientation bore opens into the tool holder bore. The orientation bore central longitudinal axis is disposed generally perpendicular to the tool holder bore central longitudinal axis. The assembly has a tool holder that has a leading head region, a trailing shank region, and a mediate region intermediate of and contiguous with the leading head region and the trailing shank region. The leading head region of the tool holder contains a rotatably cutting tool bore. The trailing shank region contains an orientation slot. The mediate region presents a forward protective surface defining debris diversion surfaces. An orientation pin is received within the orientation bore so as to project into the orientation slot. The orientation pin cooperates with the orientation slot in the holder so the tool holder presents a correct orientation relative to the base. There is a coolant passage extending from the proximate region of the base through the tool holder exiting at the forward protective surface. The assembly also has a nozzle in the coolant passage adjacent the forward protective surface to spray coolant in the vicinity of the forward protective surface.
In still another form thereof, the invention is a cutting tool holder-base assembly wherein the base is adapted to attach to a surface of a rotatable driving member. The tool holder-base assembly comprises a cutting tool holder that has a head region, which contains a cutting tool bore. The cutting tool holder further has a shank region with a distal end wherein the shank region has an alignment notch presenting an alignment surface at the distal end. The assembly has a base that contains a tool holder bore. The base further contains a transverse passage intersecting the tool holder bore. The assembly also has an elongate pin in the transverse passage. The elongate pin has an exposed portion thereof passing through the tool holder bore wherein the cutting tool holder is able to enter completely the tool holder bore of the base when the alignment surface is in alignment with the exposed portion of the elongate pin.
The following is a brief description of the drawings that form a part of this patent application:
Referring to the drawings,
As the skilled artisan appreciates, the road milling machine contains a rotatable road milling drum. Road milling drum presents a cylindrical surface. A plurality of bases (or support blocks), which are described hereinafter, mount such as, for example, by welding of the cylindrical surface. As will be described hereinafter for a specific embodiment, each base or support block retains a tool holder or cutting bit holder, and the tool holder retains a cutting bit (e.g., a rotatable cutting bit). The assembly comprises the base and the tool holder. When a number of such assemblies carrying cutting bits (i.e., cutting bit assemblies) mount to a drum, and the drum is driven, the cutting bits impinge and break up the earth strata (e.g., asphaltic roadway material, concrete, coal, and the like) into many pieces (i.e., cutting debris). The road milling machine includes a conveyor 24 from which asphaltic debris (or milling debris) exits (see 25) during operation. U.S. Pat. No. 7,144,192 to Holl et al. for a SELF-PROPELLED ROAD MILLING MACHINE, U.S. Pat. No. 7,370,916 to Ley et al. for a REAR LOADER ROAD MILLING MACHINE WITH HEIGHT-ADJUSTABLE SEALING DEVICE, and U.S. Pat. No. 7,070,244 to Fischer et al. for a ROAD MILLING MACHINE disclose exemplary road milling machines.
During operation of the road milling machine, the support block experiences wear due to exposure thereof to the cutting debris. Over time, wear and other kinds of abuse causes the support block to be ineffective which signals an end to its useful life. Once this occurs, the operator must cut or torch the support block off the drum to allow for replacement of the support block. Typically, the operator welds the replacement support block to the drum. As the skilled artisan appreciates, it is time-consuming and hence costly, to remove and replace a support block. Thus, there is an advantage to be able to prolong the useful life of the support block. The present invention provides for that advantage.
The cutting bits and cutting bit holders are subjected to considerable stresses during road milling operations. Accordingly, there is a desire to mount the cutting bit holder in the support block to minimize movement of the cutting bit holder in order to maximize the useful life of the cutting bit. It is also important that the mounting between the cutting bit holder and the support block be resistant to vibratory loosening which could likewise lead to premature cutting bit wear and failure. The present invention provides a secure mounting of the cutting bit to the tool holder and of the tool holder to the base.
A mining machine or a road milling machine operates typically in severe operating conditions. During operation, the cutting bit holder (or tool holder) and/or the support block (or base) can experience damage such that it is difficult to disassemble these components. It is an advantage to be able to disassemble the cutting bit holder from the support block. The present invention provides the feature of a cutting bit holder-support block assembly that facilitates a relatively easy disassembly of the cutting bit holder from the support block. Further, during operation, the severe operating conditions can also cause the rotatable cutting bit to lodge in the bore of the cutting bit holder. It would be advantageous to disassemble the cutting bit from the cutting bit holder. Thus, it is highly desirable to provide a cutting bit-cutting bit holder assembly that facilitates the relatively easy disassembly of the cutting bit from the cutting bit holder.
Referring to the drawings, the embodiments of
The base 32 comprises a proximate region (see bracket 42) and a distal region (see bracket 44). The proximate region (42) is closer to the surface 40 of the rotatable drum 38 than the distal region 44.
The proximate region 42 has an attachment surface 46, which exhibits a slight degree of concavity. The base 32 can be affixed at the attachment surface 46 to the surface of the drum by welding or the like. The proximate region 42 further comprises an end/leading surface 48, which is adjacent to the surface 40 of the rotatable drum 38. The proximate region 42 further has a leading proximate base surface 50, which has a central portion, i.e., central portion of the leading proximate base surface, 52. The central portion of the leading proximate base surface 52 is intermediate of a pair of spaced apart lateral portions of the leading proximate base surface 54, 56 (see
The proximate region 42 of the base 32 has a trailing proximate base surface 60. The proximate region 42 of the base 32 contains an orientation bore 62 (see
The distal region 44 of the base 32 has a distal end surface 68 that is farthest removed from the surface 40 of the rotatable drum 38. Referring to
The tool holder bore 84, which is an open bore, has an axial forward end 96 and an axial rearward end 98. There is access to the rearward end of the tool holder through the axial rearward end 98 of the tool holder bore 84. Through this access, the operator can cause an impact on the rearward end of the tool holder to facilitate to disassembly of the tool holder from the base. As mentioned above, during operation, the tool holder and/or the base may suffer damaged or at least impacted so that disassembly is difficult. The above access facilitates the disassembly of the tool holder from the base. This is an advantage provided by the present invention.
Referring to
The head region 100 of the tool holder 34 has a leading surface 120, a rotatable cutting tool bore leading mouth surface head region, and a protective surface 124. Referring to
The shank region 102 of the tool holder 34 has a tapered external surface 140, as well as an axial rearward end surface 142. A cylindrical surface 141 is adjacent to the end surface 142. The shank region 102 further contains a closed axial rearward bore 144, which has an open end 146. The presence of the closed axial rearward bore 144 provides some radial flexibility to the shank region 102. The relative dimensioning of the shank region 102 and the bore 84 provides for a tight fit (e.g., interference fit) between the base and the tool holder.
The shank region 102 further contains an elongate slot 150.
In reference to
The rotatable cutting tool 36 comprises a rotatable cutting tool body 180, which has an axial forward end 182 and an axial rearward end 184. The rotatable cutting tool body 180 has a head portion 186, as well as a enlarge diameter shoulder portion 188 and washer 204. The rotatable cutting tool body 180 has a shank portion 190, which carries a resilient retainer 200, which rotatably retains the rotatable cutting tool 36 in the rotatable cutting tool bore 110. The axial forward end 182 of the rotatable cutting tool body 180 carries a hard insert 202, which comprises a hard material such as, for example, cemented (cobalt) tungsten carbide.
The rotatable cutting tool bore 110, which is an open bore, has an axial forward end 112 and an axial rearward end 114. There is access to the rearward end 184 of the rotatable cutting tool 36 through the axial rearward end 114 of the cutting tool bore 110. Through this access, the operator can cause an impact on the rearward end of the cutting tool to facilitate disassembly of the cutting tool from the cutting tool holder. As mentioned above, during operation, the cutting tool and/or the cutting tool holder may suffer damage or at least impact such that disassembly is difficult. The above access facilitates the disassembly of the cutting tool from the cutting tool holder. This is an advantage provided by the present invention.
In operation, the assembly functions to divert debris away from the base. The result is an increase in the useful life of the base. This is an advantageous aspect of the assembly for reasons set forth above. In reference to the debris diversion feature, the arrows DD in
Referring to
Referring to
Referring to
Referring to
The presence of the coolant (e.g., a liquid such as water) provides at least two advantages to the overall cutting operation. One advantage is that the coolant facilitates the rotation of the cutting tool in the tool holder due to the cleaning action of the coolant. The coolant acts to help flush the dirt and debris from the vicinity of the cutting tool-tool holder-base assembly. Such a reduction in the amount of the dirt and debris helps the rotation of the cutting tool in the tool holder. Another advantage is that the coolant spray helps with the suppression of dust and fine particulates extant in at least some cutting operations. A cutting operation such a mining operation or a road milling operation can generate dust and other fine particulates, which are in the air. The dust and other fine particulates can be an environmental issue. By spraying the dust and other fine particulates with a fluid spray, the fluid entrains the dust and other fine particulates to remove them from the air in the vicinity of the cutting operation. The with the dust and other fine particulates therein can then be removed to a remote location thereby improving the environmental condition in the vicinity of the cutting operation.
The tool holder-base assembly 248 has a base generally designated as 250 and a tool holder generally designated as 252. The base 250 and the tool holder 252 are structurally along the lines of the tool holder-base assembly of the first embodiment, except for the presence of the components that provide for the spray of coolant. Here, the base 250 has a proximate region 256 and a distal region 258. The proximate region 256 has an attachment surface 260, an end/leading surface 262, a leading proximate base surface 264 and a trailing proximate base surface 266. The proximate region 256 further contains an orientation bore 268, which has an orientation bore central longitudinal axis J-J. The orientation bore 268 has a distal end 272 and a proximate end 274. The proximate region 256 further contains a coolant bore 278, which has a distal end 280 and approximate end 282.
The distal region of the base contains a tool holder bore 288.
The tool holder has a head region 292 and a shank region 294 of the tool holder. The shank region 292 contains a coolant passage 296, which has a coolant passage entrance 298. The head region 292 of the tool holder contains a coolant passage 302, which has a coolant passage exit 304. A nozzle 306 is in the exit 304 of the coolant passage 302.
In operation, the coolant passes and travels through the coolant bore 278 and the coolant passage 296 toward the coolant passage exit 304. A nozzle 306 is near the coolant passage exit 304. The coolant sprays out of the nozzle 306 in a spray 800 (see
The distal region 314 has a distal end surface 324. The distal region 314 further has a leading distal base surface 326 and a trailing distal base surface 328. The distal region 314 contains a tool holder bore 330, which has an axial forward end 332 and an axial rearward end 334. The distal region 314 contains an orientation bore 338, which has an orientation bore central longitudinal axis K-K. The orientation bore 338 has a distal end 342 and a proximate end 344. The orientation bore 338 has a shoulder 346 mediate of the distal end 342 and the proximate end 344.
The head region of the tool holder contains a rotatable cutting tool bore 348. The head region further includes a leading surface 350 and a trailing surface 352.
The shank region of the tool holder has a tapered external surface 354 and an axial rearward end surface 356. The shank region further contains a closed axial rearward bore 358, which has an open end 360. The shank region of the tool holder contains an elongate slot 364.
An orientation pin 366 has an exterior end 368 and an interior end 370.
In operation, the orientation pin 366 threads into the orientation bore 338 in the base 309. The portion of the pin 366 adjacent to the interior end 370 protrudes into the elongate slot 364. This only occurs when the tool holder 308 correctly aligns with the base 309. When there is incorrect alignment between the tool holder and the base, the rearward end surface 356 of the shank region abuts against the orientation pin 366. It is apparent that the orientation pin 366 cooperates with the elongate slot 364 to facilitate correct orientation of the tool holder and the base.
Referring to
A collar 416 extends away from the top base surface 414. A tool holder bore 418 travels through the base 400. The collar 416 surrounds the bore 418 at the leading open end 420 thereof. The bore 418 further has a trailing open end 422. The bore 418 presents a tapered, frusto-conical, bore surface 424. The bore 418 has a central longitudinal axis AA-AA. In one range, the half angle of taper (BB-BB) of the bore surface 424 is equal to between about 2½ degrees and about 5½ degrees with the preferred half angle being equal to about 5½ degrees. In another range, the half angle of taper (BB-BB) of the bore surface 424 is equal to between about 2½ degrees and about 7½ degrees with the preferred half angle being equal to about 7½ degrees.
There should be an appreciation that the base 400 further contains a transverse passage 430. Transverse passage 430 passes from one side base surface 408 to the other side base surface 410. Transverse passage 430 intersects the bore 418 at a location so as to create an open slot 432 in the surface 424 of the bore 418.
An elongate pin 436 passes through the transverse passage 430. Elongate pin 436 is of a length so that the opposite end surfaces of the pin 436 are flush with their corresponding ones of the one side base surface 408 and the other side base surface 410. Elongate pin 436 has a cylindrical surface 440. However, there should be an appreciation that the elongate pin may present a geometry other than cylindrical. The geometry may be a shape such that the surface of the elongate pin engages the flat surface 530 of the tool holder 500.
As shown in
Referring to the drawings, and especially
The head region 502 contains a bore 550 that has a mediate threaded cylindrical surface 552. A threaded bore 550 has a forward end 556 and a rearward end 558. The bore 550 further includes a smooth forward region 590 that extends between the forward end 556 and the mediate threaded surface 552, as well as a smooth rearward region 592 that extends between the rearward end 558 and the mediate threaded surface 552. As will be described in more detail hereinafter, the bore 550 is adapted to receive the threaded section of an installation-removal tool 600. The operator can use the installation-removal tool 600 to better position the tool holder 500 in relation to the base 400.
There should be an appreciation that the bore 550 may be partially threaded or it may be fully threaded. In other words, substantially all of the surface of the bore 550 may be threaded.
The shank region 504 projects from the trailing surface 518 of the head region 502. The shank region 504 has a leading end 522 and an opposite distal trailing end 524. The shank region 504 has a central longitudinal axis EE-EE. The shank region 504 present an alignment region 528 defined by a flat surface 530. The alignment region 528 has a stop 560 at the axial forward end thereof. The shank region 504 contains an elongate slot 562 in the flat surface 530 thereof.
The specific embodiment of the tool holder-base assembly 399 as illustrated in
First, the tool holder-base assembly 399 provides a feature whereby the operator can easily align the tool holder 500 with the base 400 to better facilitate the assembly of these components. As the skilled artisan can appreciate, it is advantageous for the tool holder 500 to align correctly with the base 400 to achieve proper relative alignment upon assembly.
In order to assemble the tool holder 500 to the base 400, the operator positions the shank region 504 to be an axial alignment with the bore 418 of the base 400. More specifically, the central longitudinal axis EE-EE of the shank region 504 is coaxial with the central longitudinal axis AA-AA of the tool holder bore 418. The shank region 504 must have an orientation relative to the base 400 so that the flat surface 530 slides (or rides) over the cylindrical surface 440 of the elongate pin 436. There is the contemplation that the elongate pin may present a geometry other than cylindrical. The flat surface 530 rides over the cylindrical surface 440 as the shank region 504 enters the bore 418 of the base 400 to accomplish proper alignment. The dimensioning of the flat surface 530 relative to the position of the elongate pin 436 is such that upon assembly of the tool holder 500 and the bore 418 of the base 400, a cylindrical surface 440 of the elongate pin 436 rests (or can rest) against the stop 562. One can see that the elongate pin has an exposed portion that passes through the tool holder bore. The cutting tool holder is able to enter completely the tool holder bore of the base when the alignment surface is in alignment with the exposed portion of the elongate pin.
The geometry of the shank region 504 and the tool holder bore 418 is such that there is a matching taper between the two components. Further, the exterior surface of the shank region 504 has a collapsible toroidal geometry such that there is an interference fit between the shank region 504 and the tool holder bore 418. The relative geometries between the shank region 504 and the tool holder bore 418 is along the lines of the KPF303R sleeve and the KPF301 base, both made by Kennametal Inc. of Latrobe, Pa. 15650.
There should be an appreciation that if the tool holder 500 is not aligned with the base 400 as described above, the distal trailing end 524 of the shank 504 will abut against the elongate pin 436. Only when there is sufficient clearance due to the depth of the alignment region 528 will the tool holder 500 clear the elongate pin 436.
The tool holder-base assembly 399 has another advantageous feature, which is the ease with which the operator can move or position the tool holder 500 relative to the base 400. The installation-removal tool 600 allows the operator to accomplish this task. Referring to
To engage the tool holder 500, the operator takes the installation removal tool 600 and inserts the threaded region 612 into the bore 550. The operator then threads the threaded region 612 into mediate threaded surface 552. Once the threaded connection is secure, the operator can then transport or position the tool holder 500 to align and then attach the tool holder 500 to the base 400. After the tool holder 500 attaches to the base 400, the operator can then unthreaded the installation-removal tool 600 from the threaded bore 550.
As one can appreciate, when the need arises to detach the tool holder 500 from the base 400, the operator can insert the threaded region 612 of the installation-removal tool 600 into the bore 550 of the tool holder 500. The operator then threads the threaded region 612 into mediate threaded surface 552. The operator can then remove the tool holder 500 from the base. The operator can then unthread the installation-removal tool 600 from the tool holder 500.
As one can appreciate, the present invention uses a cutting bit holder, sometimes referred to as a cutting bit sleeve or a cutting tool holder, wherein the cutting bit rotatably or otherwise mounts in a releasable fashion within the cutting bit holder. The cutting bit holder mounts within the support block via a mechanical connection. The presence of the cutting bit holder helps protect the support block from abuse and wear, thus minimizing or eliminating the periods of down time otherwise required for drum repair. As one can also appreciate, the present invention provides a way to mount the cutting bit holder in the support block to minimize movement of the cutting bit holder in order to maximize the useful life of the cutting bit. In this regard, the present provides a mounting between the cutting bit holder and the support block that is resistant to vibratory loosening which could likewise lead to premature cutting bit wear and failure. As one can also appreciate, the present invention provides a cutting bit holder-support block assembly that facilitates a relatively easy disassembly of the cutting bit holder from the support block.
The patents and other documents identified herein are hereby incorporated by reference herein. Other embodiments of the invention will be apparent to those skilled in the art from a consideration of the specification or a practice of the invention disclosed herein. It is intended that the specification and samples are illustrative only and are not intended to be limiting on the scope of the invention. The true scope and spirit of the invention is indicated by the following claims.
This patent application is a non-provisional patent application is based in part upon U.S. Provisional Patent Application Ser. No. 61/168,272 filed on Apr. 10, 2009 by Eric P. Helsel, Donald E. Keller, Don Rowlett, Stephen P. Stiffler and Wayne Beach for a ROTATABLE CUTTING TOOL-TOOL HOLDER-BASE ASSEMBLY. Under the United States Patent Statute, applicants hereby claim the priority of said provisional patent application (U.S. Provisional Patent Application Ser. No. 61/168,272 filed on Apr. 10, 2009 by Helsel et al. for a ROTATABLE CUTTING TOOL-TOOL HOLDER-BASE ASSEMBLY). Further, applicants hereby incorporate by reference herein the entirety of the U.S. Provisional Patent Application Ser. No. 61/168,272 filed on Apr. 10, 2009 to Helsel et al.
| Number | Date | Country | |
|---|---|---|---|
| 61168272 | Apr 2009 | US |
