EP0264015B1 - Rotatable cutting bit - Google Patents
Rotatable cutting bit Download PDFInfo
- Publication number
- EP0264015B1 EP0264015B1 EP87114132A EP87114132A EP0264015B1 EP 0264015 B1 EP0264015 B1 EP 0264015B1 EP 87114132 A EP87114132 A EP 87114132A EP 87114132 A EP87114132 A EP 87114132A EP 0264015 B1 EP0264015 B1 EP 0264015B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- retainer
- bore
- rearward
- cutting bit
- rear end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 95
- 230000000717 retained effect Effects 0.000 claims abstract description 6
- 239000000356 contaminant Substances 0.000 description 14
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000002788 crimping Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000011236 particulate material Substances 0.000 description 2
- 238000005219 brazing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/18—Mining picks; Holders therefor
- E21C35/19—Means for fixing picks or holders
- E21C35/197—Means for fixing picks or holders using sleeves, rings or the like, as main fixing elements
Definitions
- the present invention relates to a rotatable cutting bit for mounting in the bore of a block and to a resilient retainer for rotatably mounting a rotatable cutting bit in the cylindrical bore of a block.
- Rotatable cutting bits held within a mounting block affixed to a movable member, such as a mining wheel or road planing drum, have been utilized to perform various excavating operations. These excavating operations can include applications relating to the removal of minerals as well as applications relating to road planing, trenching, concrete cutting and other construction applications. While earlier devices have performed satisfactorily, certain problems or drawbacks have existed, and the present invention is an improved design directed to successfully overcoming these drawbacks.
- Typical cutting bits that have been previously utilized have included an enlarged diameter portion or a sharp stepped or flanged diameter portion at the rear end of the shank such as those illustrated in U.S. Patent No. 4 201 421 to Den Besten et al. or in U.S. Patent No. 3 519 309 to Engle et al., or in US-A 4 575 156 corresponding to the preamble of claims 1 and 8, for example.
- In manufacturing the rearward portion of the bit body via techniques such as cold heading, forging or machining it has been found that it is more economical to avoid forming such an enlarged diameter portion. It would thus be advantageous to provide a cutting bit wherein the rearward portion of the bit body is of a substantially constant diameter thereby eliminating an enlarged or sharp stepped diameter portion.
- the invention as claimed is intended to remedy these drawbacks. It solves the problems of conventional cutting bits that have utilized an enlarged diameter portion or a sharp stepped or flanged diameter portion at the rear end of the shank and would thus be advantageous to provide a cutting bit wherein the rearward portion of the bit body is of a substantially constant diameter thereby eliminating an enlarged or sharp stepped diameter portion.
- a rotatable cutting bit for mounting in the bore of a block
- the rotatable cutting bit comprising an elongate body generally symmetrical about a longitudinal axis having forward and rearward portions, said forward portion terminating in a front end at which there is a cutting tip, and said rearward portion terminating in a rear end, and a resilient retainer which comprises a cylindrical sleeve having front and rear ends and surrounding substantially all of the rearward portion and said retainer having an unstressed diameter greater than the diameter of the bore so that when the rotatable cutting bit is inserted into the bore the retainer expands against the bore so as to be held therein;
- the cutting bit is characterized in that said rearward portion is of a generally constant diameter and contains an annular channel adjacent the rear end; said cylindrical sleeve rear end being less in diameter than the bore and having an inwardly crimped portion which extends rearwardly past the rear end of said
- a resilient retainer for rotatably mounting a rotatable cutting bit in the cylindrical bore of a block comprising an elongate cylindrical sleeve having opposite front and rear ends, said sleeve being axially split along the entire length thereof, said sleeve having integral forward and rearward portions, said forward portion being of substantially constant diameter, and said retainer having an unstressed diameter greater than the diameter of the bore so that when the assembly of the cutting bit and retainer are inserted into the bore the retainer expands against the bore so as to be held therein;
- the resilient retainer is characterized in that the forward portion is tapered radially inwardly and at least one radially inward projection adapted to engage the cutting bit is contained in the forward portion of said resilient retainer.
- the advantages offered by this invention provide an improved retainer and cutting bit which may be rotatably held within the bore of a mounting block affixed to a movable member; a cutting bit that is more economical to manufacture; a retainer and cutting bit that it is easy to extract from the bore of the block; a retainer and rotatable cutting bit that does not trap particulate matter between the retainer sleeve and the rear shank of the bit; and a retainer and a cutting bit whereby the retainer provides a means to guide the bit into the bore of the mounting block.
- Fig. 1 a cutting assembly generally designated as 10 which is mounted to a rotatable or movable member 12.
- the rotatable or movable member may comprise a mining wheel, a road planing drum a bucket blade, a grader blade or the like.
- the cutting assembly 10 includes a block 14 having a front face 16, a rear face 18, and a mounting face 20.
- Block 14 further includes a generally cylindrical bore 22 having a frusto-conically shaped seating surface 24 adjacent the front face 16 thereof.
- the block is affixed at the mounting face 20 to the rotatable member 12 such as by welding or the like.
- Cutting assembly 10 further includes a cutting bit generally designated as 30.
- cutting bit 30 includes an elongate steel body 32 having integral forward and rearward portions 34 and 36, respectively.
- An annular frusto-conically shaped shoulder 38 joins the forward and rearward portions.
- Body 32 further includes an annular puller groove 40 positioned forwardly of annular shoulder 38. Puller groove 40 is designed to receive a tool, well known to those in the art, which facilitates the removal of the cutting bit from the block.
- Forward portion 34 includes a flat front face 42 having a socket (not illustrated) contained therein in which a cutting tip 44 is affixed such as by brazing.
- Cutting tip 44 is made from a hard material such as a cemented tungsten carbide.
- the rearward portion 36 of steel body 32 terminates in a flat rear end 46 and has a frusto-conically shaped or tapered portion 48 adjacent the rear end 46.
- the rearward portion 36 contains an annular channel 50 positioned forwardly of the frusto- conically shaped portion 48.
- a constant diameter cylindrical portion 52 then joins the annular channel 50 with the annular shoulder 38.
- FIG. 7 and 8 Another specific embodiment of the cutting bit is illustrated in Figs. 7 and 8. Elements in these specific embodiments that are common to one another are illustrated with the same reference numeral except that the reference numerals for the embodiment of Figs. 7 and 8 are primed.
- the primary difference between the specific embodiment of Figs. 7 and 8 than that illustrated in Figs. 2 and 4 is the presence of a plurality of generally equi-spaced axial grooves 120 located in the frustoconically shaped portion 48'. These grooves communicate with annular groove 50' and are open at the rear end 46'.
- a retainer surrounds substantially all of the rearward portion 36 of the cutting bit body 32.
- the retainer serves two basic purposes. The first is to retain the bit body in the block, and the second is to protect the block from wear by functioning as a wear sleeve between the bit body and block.
- Several specific embodiments of the retainer are illustrated in Figs.3, 5 and 6, and each will be described below.
- one specific embodiment of the retainer comprises an elongate sleeve 62 having a forward portion 64 and a rearward portion 66.
- the forward portion 64 terminates in a generally circularly-shaped front edge 68 and the rearward portion 66 terminates in a generally circularly-shaped rear edge 70.
- the rearward portion 66 is crimped in a radially inward direction as illustrated in Fig. 3 so that the rearward portion 66 takes on a general frusto-conical shape.
- Rearward portion 66 includes a plurality of axial slots 72 which facilitate the crimping of the rearward portion.
- the forward portion 64 of sleeve 64 contain a plurality of radially inwardly projecting dimples 74 positioned forwardly of the juncture between the forward and rearward portions 64,66 of the sleeve 62.
- the retainer 60 is positioned relative to the cutting bit body 32 so as to surround the rearward portion 36 thereof whereby the dimples 74 are received within the annular channel 50.
- the diameter of the forward portion 64 of retainer 60 in an unstressed condition is larger than the diameter of bore 22 of block 14. Consequently, when the assembly of the cutting bit body and the retainer is inserted into the bore, the diameter of the forward portion 64 of the retainer 60 is radially compressed whereby when inside the bore, the retainer 60 expands against the bore so as to be securely held therein.
- Dimples 74 are received within annular groove 70 so as to retain the cutting bit body and retainer together.
- the dimensioning of the dimples 74 relative to the annular channel 50 and the sleeve itself relative to the rearward portion of the cutting bit body are as such that the cutting bit is free to rotate relative to the retainer and the block when the cutting bit-retainer assembly is inserted into the bore of the block.
- the cutting bit body is rotatably retained by the retainer which is securely held in the bore of the block. The end result being that the bit is rotatably mounted within the block.
- a retainer comprising an elongate sleeve 82 having a forward portion 84 and a rearward portion 86.
- the forward portion 84 terminates in a generally circularly-shaped front edge 88 and the rearward portion 86 terminates in a generally circularly-shaped rear edge 90.
- the rearward portion 86 is crimped in a radially inward direction as illustrated in Fig. 5 so that rearward portion 86 takes on a general frusto-conical shape.
- Rearward portion 86 further includes axial slots 92 which facilitate the crimping of rearward portion 86.
- Retainer 80 further includes a radially inwardly projecting annular projection 94 which extends around the circumference of retainer 80.
- Annular projection 94 is positioned at the juncture of the forward and rearward portions 84 and 86 of the sleeve 82.
- Annular projection 94 is designed to be received within the annular channel 50 of the cutting bit and has the same general diametrical dimensioning as retainer 60.
- the unstressed diameter of the forward portion 84 of retainer 80 is larger than the diameter of bore 22 so that when the cutting tool assembly of the cutting bit and retainer are inserted into the bore, the retainer 80 expands against the surface of the bore 22 so as to be securely held therein.
- FIG. 6 there is illustrated another specific embodiment of the retainer, generally designated 100, comprising an elongate sleeve 102 having a forward portion 104 and a rearward portion 106.
- the forward portion 104 terminates in a generally circularly-shaped front edge 108 and the rearward portion 106 terminates in a generally circularly-shaped rear edge 110.
- the rearward portion 106 is crimped in a radially inward direction as illustrated in Fig. 6 so that the rearward portion takes on a general frusto-conical shape.
- Rearward portion 106 further contains a plurality of axial slots 112 therein which facilitate the crimping of rearward portion 106.
- Retainer 100 further includes a plurality of equi-spaced circumferential projections 114 which project radially inwardly and are received within channel 50 of the cutting bit. Each projection contains a pair of oppositely disposed apertures 116.
- this retainer 100 has the forward portion 104 thereof being of an unstressed diameter that is greater than the diameter of the bore 22 of the block. Consequently, when the assembly of the cutting bit and retainer is inserted into the bore, the retainer expands against the bore so as to be securely held within. Projections 114 are received within annular channel 50 so as to rotatably retain the cutting bit body within the retainer, the end result being that the bit is rotatably mounted within the block.
- the cutting bit assembly is mounted in the block so that the bit body is able to rotate relative to the block. This is accomplished by inserting the cutting assembly into the bore of the block so that, as previously described, the retainer is securely fixed within the bore and the c utting bit body is rotatably retained within the retainer by the reception of the projections within the channel.
- the end result being that the bit is able to rotate relative to the block during operation.
- the ability to rotate is one of the important operational features of the assembly since wear on the carbide tip more evenly occurs and flat spots on the tip are avoided.
- the rearward portion thereof is crimped in a radially inward direction so that the diameter of the rear edge of the retainer is less than the diameter of the bore. Because of this difference in the diameters of the rear edge and the bore and the frusto-conical shape of the rearward portion, the rearward portion of the retainer is easily positioned within the top portion of the bore prior to the cutting bit assembly being driven into the bore. Further, the rearward portion of the retainer acts to guide the cutting bit assembly into the bore upon insertion. The ability to guide the cutting bit assembly into the bore in the insertion process is a desirable feature not possessed by cutting bits having enlarged diameter or sharply stepped rear portions.
- the rearward portion of the retainer extends over and rearwardly of the rear end of the cutting bit body and extends forwardly so as to surround substantially all of the rearward portion of the steel cutting bit body.
- the retainer functions both as a retainer and a wear sleeve that protects the bit body and block from wear during the cutting operation. Because the retainer extends rearwardly past the rear end of the cutting bit, the bore is protected from wear caused by the rear end of the bit body.
- the rearward portion of the cutting bit body does not have an enlarged diameter portion by which contaminants are entrapped.
- contaminants found in the space between the rearward portion of the cutting bit body and the retainer will be able to exit this space over the rearward portion of the bit and a build-up of contaminants will not occur.
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Drilling Tools (AREA)
- Road Repair (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Earth Drilling (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Harvester Elements (AREA)
- Threshing Machine Elements (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Table Equipment (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
- The present invention relates to a rotatable cutting bit for mounting in the bore of a block and to a resilient retainer for rotatably mounting a rotatable cutting bit in the cylindrical bore of a block.
- Rotatable cutting bits held within a mounting block affixed to a movable member, such as a mining wheel or road planing drum, have been utilized to perform various excavating operations. These excavating operations can include applications relating to the removal of minerals as well as applications relating to road planing, trenching, concrete cutting and other construction applications. While earlier devices have performed satisfactorily, certain problems or drawbacks have existed, and the present invention is an improved design directed to successfully overcoming these drawbacks.
- Typical cutting bits that have been previously utilized have included an enlarged diameter portion or a sharp stepped or flanged diameter portion at the rear end of the shank such as those illustrated in U.S. Patent No. 4 201 421 to Den Besten et al. or in U.S. Patent No. 3 519 309 to Engle et al., or in US-A 4 575 156 corresponding to the preamble of claims 1 and 8, for example. In manufacturing the rearward portion of the bit body via techniques such as cold heading, forging or machining, it has been found that it is more economical to avoid forming such an enlarged diameter portion. It would thus be advantageous to provide a cutting bit wherein the rearward portion of the bit body is of a substantially constant diameter thereby eliminating an enlarged or sharp stepped diameter portion.
- In previous cutting bits having such enlarged or sharply stepped diameter portions, it has been found that when the bit is extracted from the block, the sleeve can become positioned between the enlarged or stepped diameter portion and the cylindrical bore wall wedging the sleeve into the bore making it virtually impossible to easily extract the bit from the block and usually requiring the block to be removed and replaced. As can be appreciated, undesirable additional expense is associated with removing and then replacing the block resulting in unnecessary and expensive down time.
- Earlier cutting bits have utilized the enlarged diameter or sharply stepped rearward portion of the bit as an abutment to retain a cylindrical retainer or clip captive on the bit. In operation of the previous bits and retainers, the rearward portion of the bit contacts the cylindrical wall of the bore so that wear on certain portions of the bore occurs as the bit rotates in the mounting block. It would thus be advantageous to provide a retainer wear sleeve which protects the bore of the block from wear due to contact with the shank of the cutting bit during operation. Such a retainer wear sleeve would increase the life of the block since contact between the shank and the bore of the block would be reduced.
- During the cutting operation, a large volume of particulate materials are generated. These particulates tend to infiltrate the bore of the blockbit assembly, and collect in the volume between the rear shank and retainer wear sleeve. Earlier cutting bits having an enlarged diameter or sharply stepped rearward portion have trapped these contaminants and impaired the ability of the bit either to rotate in the bore of or to be efficiently removed from the block. Consequently, it would be advantageous to provide a cutting bit that does not have an enlarged diameter or sharply stepped rearward portion so that the tendency of particulate material being trapped between the sleeve and the shank is reduced.
- In order to insert previous cutting bits having the enlarged diameter or sharply stepped rearward portion into the bore of the block, the rearward portion is aligned with the bore of the block and the bit driven into the bore. Earlier retainers for cutting bits have not provided any means to assist in guiding the bit into the bore of the mounting block. It would thus be advantageous if a retainer for a cutting bit did provide a means for guiding the bit into the bore and also protected the bore of the block from wear or distortion.
- The invention as claimed is intended to remedy these drawbacks. It solves the problems of conventional cutting bits that have utilized an enlarged diameter portion or a sharp stepped or flanged diameter portion at the rear end of the shank and would thus be advantageous to provide a cutting bit wherein the rearward portion of the bit body is of a substantially constant diameter thereby eliminating an enlarged or sharp stepped diameter portion.
- With these objects in view, according to a first aspect of the present invention, a rotatable cutting bit for mounting in the bore of a block is provided, the rotatable cutting bit comprising an elongate body generally symmetrical about a longitudinal axis having forward and rearward portions, said forward portion terminating in a front end at which there is a cutting tip, and said rearward portion terminating in a rear end, and a resilient retainer which comprises a cylindrical sleeve having front and rear ends and surrounding substantially all of the rearward portion and said retainer having an unstressed diameter greater than the diameter of the bore so that when the rotatable cutting bit is inserted into the bore the retainer expands against the bore so as to be held therein; according to the invention, the cutting bit is characterized in that said rearward portion is of a generally constant diameter and contains an annular channel adjacent the rear end; said cylindrical sleeve rear end being less in diameter than the bore and having an inwardly crimped portion which extends rearwardly past the rear end of said rearward body portion, said retainer having at least one inward projection being adjacent to said rear end of said sleeve received within said channel so that the elongate body and retainer are retained together.
- According to a second aspect of the invention, a resilient retainer is provided for rotatably mounting a rotatable cutting bit in the cylindrical bore of a block comprising an elongate cylindrical sleeve having opposite front and rear ends, said sleeve being axially split along the entire length thereof, said sleeve having integral forward and rearward portions, said forward portion being of substantially constant diameter, and said retainer having an unstressed diameter greater than the diameter of the bore so that when the assembly of the cutting bit and retainer are inserted into the bore the retainer expands against the bore so as to be held therein; according to the invention, the resilient retainer is characterized in that the forward portion is tapered radially inwardly and at least one radially inward projection adapted to engage the cutting bit is contained in the forward portion of said resilient retainer.
- The advantages offered by this invention provide an improved retainer and cutting bit which may be rotatably held within the bore of a mounting block affixed to a movable member; a cutting bit that is more economical to manufacture; a retainer and cutting bit that it is easy to extract from the bore of the block; a retainer and rotatable cutting bit that does not trap particulate matter between the retainer sleeve and the rear shank of the bit; and a retainer and a cutting bit whereby the retainer provides a means to guide the bit into the bore of the mounting block.
- The above-mentioned and other features and objects of this invention and the manner of attaining them will become more apparent and the invention itself will be best understood by reference to the following description of an embodiment of the invention taken in conjunction with the accompanying drawings.
- Fig. 1 is a side view of a cutting bit-block assembly wherein the cutting bit is inserted into the block and the block is affixed to a movable member;
- Fig. 2 is a sectional side view of the cutting assembly of Fig. 1;
- Fig. 3 is a perspective view of one specific embodiment of the retainer wear sleeve of Fig. 2;
- Fig. 4 is a side view of the cutting bit body of Fig. 1; Fig. 5 is a perspective view of a second specific embodiment of the retainer wear sleeve;
- Fig. 6 is a perspective view of a third specific embodiment of the retainer wear sleeve;
- Fig. 7. is a side view of a second specific embodiment of the cutter bit body; and
- Fig. 8 is a rear plan view of the cutter bit body of Fig. 7.
- Referring to the drawings, there is illustrated in Fig. 1a cutting assembly generally designated as 10 which is mounted to a rotatable or
movable member 12. Although not intended to be limiting, the rotatable or movable member may comprise a mining wheel, a road planing drum a bucket blade, a grader blade or the like. Thecutting assembly 10 includes ablock 14 having afront face 16, arear face 18, and amounting face 20.Block 14 further includes a generallycylindrical bore 22 having a frusto-conically shaped seating surface 24 adjacent thefront face 16 thereof. As can be appreciated from Fig. 1, the block is affixed at themounting face 20 to therotatable member 12 such as by welding or the like. -
Cutting assembly 10 further includes a cutting bit generally designated as 30. Referring to Figs. 2 and 4, cuttingbit 30 includes anelongate steel body 32 having integral forward andrearward portions shaped shoulder 38 joins the forward and rearward portions.Body 32 further includes anannular puller groove 40 positioned forwardly ofannular shoulder 38.Puller groove 40 is designed to receive a tool, well known to those in the art, which facilitates the removal of the cutting bit from the block. -
Forward portion 34 includes a flatfront face 42 having a socket (not illustrated) contained therein in which acutting tip 44 is affixed such as by brazing.Cutting tip 44 is made from a hard material such as a cemented tungsten carbide. - The
rearward portion 36 ofsteel body 32 terminates in a flatrear end 46 and has a frusto-conically shaped ortapered portion 48 adjacent therear end 46. Therearward portion 36 contains anannular channel 50 positioned forwardly of the frusto- conicallyshaped portion 48. A constant diametercylindrical portion 52 then joins theannular channel 50 with theannular shoulder 38. - Another specific embodiment of the cutting bit is illustrated in Figs. 7 and 8. Elements in these specific embodiments that are common to one another are illustrated with the same reference numeral except that the reference numerals for the embodiment of Figs. 7 and 8 are primed. The primary difference between the specific embodiment of Figs. 7 and 8 than that illustrated in Figs. 2 and 4 is the presence of a plurality of generally equi-spaced
axial grooves 120 located in the frustoconically shaped portion 48'. These grooves communicate with annular groove 50' and are open at the rear end 46'. - As illustrated in Fig. 2, a retainer surrounds substantially all of the
rearward portion 36 of thecutting bit body 32. The retainer serves two basic purposes. The first is to retain the bit body in the block, and the second is to protect the block from wear by functioning as a wear sleeve between the bit body and block. Several specific embodiments of the retainer are illustrated in Figs.3, 5 and 6, and each will be described below. - Referring to Fig. 3, one specific embodiment of the retainer, generally designated as 60, comprises an
elongate sleeve 62 having aforward portion 64 and arearward portion 66. Theforward portion 64 terminates in a generally circularly-shapedfront edge 68 and therearward portion 66 terminates in a generally circularly-shapedrear edge 70. Therearward portion 66 is crimped in a radially inward direction as illustrated in Fig. 3 so that therearward portion 66 takes on a general frusto-conical shape.Rearward portion 66 includes a plurality ofaxial slots 72 which facilitate the crimping of the rearward portion. - The
forward portion 64 ofsleeve 64 contain a plurality of radially inwardly projecting dimples 74 positioned forwardly of the juncture between the forward andrearward portions sleeve 62. As can be appreciated from Fig. 2, the retainer 60 is positioned relative to thecutting bit body 32 so as to surround therearward portion 36 thereof whereby thedimples 74 are received within theannular channel 50. - The diameter of the
forward portion 64 of retainer 60 in an unstressed condition is larger than the diameter ofbore 22 ofblock 14. Consequently, when the assembly of the cutting bit body and the retainer is inserted into the bore, the diameter of theforward portion 64 of the retainer 60 is radially compressed whereby when inside the bore, the retainer 60 expands against the bore so as to be securely held therein.Dimples 74 are received withinannular groove 70 so as to retain the cutting bit body and retainer together. The dimensioning of thedimples 74 relative to theannular channel 50 and the sleeve itself relative to the rearward portion of the cutting bit body are as such that the cutting bit is free to rotate relative to the retainer and the block when the cutting bit-retainer assembly is inserted into the bore of the block. As can be appreciated, the cutting bit body is rotatably retained by the retainer which is securely held in the bore of the block. The end result being that the bit is rotatably mounted within the block. - Referring to Fig. 5, there is illustrated another specific embodiment of a retainer, generally designated as 80, comprising an
elongate sleeve 82 having aforward portion 84 and arearward portion 86. Theforward portion 84 terminates in a generally circularly-shapedfront edge 88 and therearward portion 86 terminates in a generally circularly-shapedrear edge 90. Therearward portion 86 is crimped in a radially inward direction as illustrated in Fig. 5 so thatrearward portion 86 takes on a general frusto-conical shape.Rearward portion 86 further includesaxial slots 92 which facilitate the crimping ofrearward portion 86. Retainer 80 further includes a radially inwardly projectingannular projection 94 which extends around the circumference of retainer 80.Annular projection 94 is positioned at the juncture of the forward andrearward portions sleeve 82. -
Annular projection 94 is designed to be received within theannular channel 50 of the cutting bit and has the same general diametrical dimensioning as retainer 60. In other words, the unstressed diameter of theforward portion 84 of retainer 80 is larger than the diameter ofbore 22 so that when the cutting tool assembly of the cutting bit and retainer are inserted into the bore, the retainer 80 expands against the surface of thebore 22 so as to be securely held therein. By virtue ofannular projection 94 being received withinannular channel 50, the cuttingbit 30 is rotatably retained within retainer 80 and is free to rotate relative to the block during the cutting operation. - Referring to Fig. 6, there is illustrated another specific embodiment of the retainer, generally designated 100, comprising an
elongate sleeve 102 having aforward portion 104 and arearward portion 106. Theforward portion 104 terminates in a generally circularly-shapedfront edge 108 and therearward portion 106 terminates in a generally circularly-shapedrear edge 110. Therearward portion 106 is crimped in a radially inward direction as illustrated in Fig. 6 so that the rearward portion takes on a general frusto-conical shape.Rearward portion 106 further contains a plurality ofaxial slots 112 therein which facilitate the crimping ofrearward portion 106.Retainer 100 further includes a plurality of equi-spacedcircumferential projections 114 which project radially inwardly and are received withinchannel 50 of the cutting bit. Each projection contains a pair of oppositely disposedapertures 116. - Like the earlier embodiments of the retainer, this
retainer 100 has theforward portion 104 thereof being of an unstressed diameter that is greater than the diameter of thebore 22 of the block. Consequently, when the assembly of the cutting bit and retainer is inserted into the bore, the retainer expands against the bore so as to be securely held within.Projections 114 are received withinannular channel 50 so as to rotatably retain the cutting bit body within the retainer, the end result being that the bit is rotatably mounted within the block. - Preferably the cutting bit assembly is mounted in the block so that the bit body is able to rotate relative to the block. This is accomplished by inserting the cutting assembly into the bore of the block so that, as previously described, the retainer is securely fixed within the bore and the c utting bit body is rotatably retained within the retainer by the reception of the projections within the channel. The end result being that the bit is able to rotate relative to the block during operation. The ability to rotate is one of the important operational features of the assembly since wear on the carbide tip more evenly occurs and flat spots on the tip are avoided.
- As previously discussed with respect to all of the specific embodiments of the retainer, the rearward portion thereof is crimped in a radially inward direction so that the diameter of the rear edge of the retainer is less than the diameter of the bore. Because of this difference in the diameters of the rear edge and the bore and the frusto-conical shape of the rearward portion, the rearward portion of the retainer is easily positioned within the top portion of the bore prior to the cutting bit assembly being driven into the bore. Further, the rearward portion of the retainer acts to guide the cutting bit assembly into the bore upon insertion. The ability to guide the cutting bit assembly into the bore in the insertion process is a desirable feature not possessed by cutting bits having enlarged diameter or sharply stepped rear portions.
- The rearward portion of the retainer extends over and rearwardly of the rear end of the cutting bit body and extends forwardly so as to surround substantially all of the rearward portion of the steel cutting bit body. As is appreciated, the retainer functions both as a retainer and a wear sleeve that protects the bit body and block from wear during the cutting operation. Because the retainer extends rearwardly past the rear end of the cutting bit, the bore is protected from wear caused by the rear end of the bit body.
- During cutting operations, a lot of particulate contaminants can be generated and these contaminants infiltrate the cutting bit-block assembly so as to become lodged in the space that exists between the interior surface of the retainer and the surface of the rearward portion of the cutting bit body. In earlier cutting bits, as previously explained, the contaminants could be trapped in this space. As the volume of contaminants becomes greater, the ability of the cutting bit body to rotate relative to the retainer (and the block) becomes impaired. It can thus be appreciated that the entrapment and retention of contaminants discussed above is undesirable.
- In the present structure, the rearward portion of the cutting bit body does not have an enlarged diameter portion by which contaminants are entrapped. Thus, contaminants found in the space between the rearward portion of the cutting bit body and the retainer will be able to exit this space over the rearward portion of the bit and a build-up of contaminants will not occur.
- It has been found that contaminants are also located in the annular channel. Because there is no physical obstacle to the rearward exit of contaminants, contaminants found in the channel are removed therefrom by the projections or dimples and then exit over the frusto-conical portion (48,48') of the bit body. The specific embodiment of a retainer illustrated in Fig. 6 enhances the ability of the contaminants to be removed from the channel through the
apertures 116 contained in theprojections 114. Theseapertures 116 provide for direct travel of contaminants out of the channel. - Once the cutting bit has become useless, it must be removed from the block. Persons have used a special tool in cooperation with the puller groove to extract the cutting bit. Because the retainer extends rearwardly over the rear end of the bit body, there is eliminated the opportunity that existed in earlier bits for the retainer to become wedged between the bit and the wall of the bore thereby making simple extraction virtually impossible.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87114132T ATE56248T1 (en) | 1986-10-07 | 1987-09-28 | ROTATING CUTTING BIT. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US91633686A | 1986-10-07 | 1986-10-07 | |
US916336 | 1986-10-07 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0264015A1 EP0264015A1 (en) | 1988-04-20 |
EP0264015B1 true EP0264015B1 (en) | 1990-09-05 |
Family
ID=25437096
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87114132A Expired - Lifetime EP0264015B1 (en) | 1986-10-07 | 1987-09-28 | Rotatable cutting bit |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0264015B1 (en) |
JP (1) | JPS63161288A (en) |
AT (1) | ATE56248T1 (en) |
AU (1) | AU592017B2 (en) |
BR (1) | BR8705346A (en) |
CA (1) | CA1301781C (en) |
DE (1) | DE3764760D1 (en) |
DK (1) | DK523087A (en) |
ES (1) | ES2005372A6 (en) |
ZA (1) | ZA876962B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19720635A1 (en) * | 1997-05-16 | 1998-11-19 | Betek Bergbau & Hartmetall | Shank cutter with cutter head and cutter shaft |
DE10142438A1 (en) * | 2001-07-04 | 2003-01-30 | Betek Bergbau & Hartmetall | Method for securing lathe tool has the tool shaft fitted with a thin metal packing sleeve to grip inside a bore in the tool holder |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE461165B (en) * | 1987-06-12 | 1990-01-15 | Hans Olav Norman | TOOLS FOR MINING, CUTTING OR PROCESSING OF SOLID MATERIALS |
US5303984A (en) * | 1992-11-16 | 1994-04-19 | Valenite Inc. | Cutting bit holder sleeve with retaining flange |
DE9411438U1 (en) * | 1994-07-16 | 1994-11-10 | Boart Longyear GmbH & Co. KG Hartmetallwerkzeugfabrik, 36149 Burghaun | Picks with lock protection |
US7380888B2 (en) | 2001-04-19 | 2008-06-03 | Kennametal Inc. | Rotatable cutting tool having retainer with dimples |
DE102005051450B4 (en) * | 2005-10-27 | 2010-08-05 | Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg | Round shank chisel and chisel holder |
DE102005051449B3 (en) | 2005-10-27 | 2007-03-01 | Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg | Circular shank chisel, has retaining units divided between edges, which are at distance from each other and extend over part of circumference of clamping sleeve, where units form co-axial concave central section turned to convex groove base |
WO2010021582A1 (en) * | 2008-08-18 | 2010-02-25 | Sandvik Intellectual Property Ab | Full sleeve retainer for step-shank of tool |
US8622482B2 (en) * | 2008-08-19 | 2014-01-07 | Phillip Sollami | Bit holder usable in bit blocks having either of a cylindrical or non-locking taper bore |
US7789468B2 (en) * | 2008-08-19 | 2010-09-07 | The Sollami Company | Bit holder usable in bit blocks having either of a cylindrical or non-locking taper bore |
JP6636548B2 (en) * | 2018-01-31 | 2020-01-29 | エポコラム機工株式会社 | Conical bit |
US11898446B1 (en) | 2022-07-29 | 2024-02-13 | Kennametal Inc. | Tool retainer |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3519309A (en) * | 1965-08-12 | 1970-07-07 | Kennametal Inc | Rotary cone bit retained by captive keeper ring |
AU490754B2 (en) * | 1976-08-23 | 1976-11-04 | Carmet Company | Mine tool and keeper |
US4201421A (en) * | 1978-09-20 | 1980-05-06 | Besten Leroy E Den | Mining machine bit and mounting thereof |
US4575156A (en) * | 1984-03-13 | 1986-03-11 | Fansteel Inc. | Mining block and bit |
-
1987
- 1987-09-16 ZA ZA876962A patent/ZA876962B/en unknown
- 1987-09-28 AU AU79009/87A patent/AU592017B2/en not_active Ceased
- 1987-09-28 EP EP87114132A patent/EP0264015B1/en not_active Expired - Lifetime
- 1987-09-28 CA CA000548028A patent/CA1301781C/en not_active Expired - Lifetime
- 1987-09-28 AT AT87114132T patent/ATE56248T1/en not_active IP Right Cessation
- 1987-09-28 DE DE8787114132T patent/DE3764760D1/en not_active Expired - Fee Related
- 1987-10-01 BR BR8705346A patent/BR8705346A/en unknown
- 1987-10-02 ES ES8702821A patent/ES2005372A6/en not_active Expired
- 1987-10-06 JP JP62252293A patent/JPS63161288A/en active Pending
- 1987-10-06 DK DK523087A patent/DK523087A/en not_active Application Discontinuation
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19720635A1 (en) * | 1997-05-16 | 1998-11-19 | Betek Bergbau & Hartmetall | Shank cutter with cutter head and cutter shaft |
DE19720635C2 (en) * | 1997-05-16 | 1999-05-12 | Betek Bergbau & Hartmetall | Chisel |
DE10142438A1 (en) * | 2001-07-04 | 2003-01-30 | Betek Bergbau & Hartmetall | Method for securing lathe tool has the tool shaft fitted with a thin metal packing sleeve to grip inside a bore in the tool holder |
DE10142438B4 (en) * | 2001-07-04 | 2007-09-13 | Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg | Mounting arrangement for a shank bit |
Also Published As
Publication number | Publication date |
---|---|
DK523087A (en) | 1988-04-08 |
BR8705346A (en) | 1988-05-24 |
ZA876962B (en) | 1988-07-27 |
CA1301781C (en) | 1992-05-26 |
AU7900987A (en) | 1988-04-21 |
EP0264015A1 (en) | 1988-04-20 |
JPS63161288A (en) | 1988-07-04 |
ATE56248T1 (en) | 1990-09-15 |
DE3764760D1 (en) | 1990-10-11 |
ES2005372A6 (en) | 1989-03-01 |
AU592017B2 (en) | 1989-12-21 |
DK523087D0 (en) | 1987-10-06 |
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