Patent Grant
10995613
This invention relates to combination bit/holders used in road milling, mining and trenching and, more particularly, to diamond coated tungsten carbide inserts and structure for mounting them as part of a unitary bit/holder combination, tool, and/or pick assembly.
Road milling bits and bit holders, the design of which, when made in differing sizes, can also be used for trenching machines and mining machines, have benefitted greatly from what has been termed a quick change shank, found in the instant inventor's prior U.S. Pat. Nos. 6,371,567; 6,685,273 and 7,883,155. Additionally, the construction features of the forward end of the advanced bit design found in applicant's U.S. Pat. No. 6,739,327 has been cited in over 70 later issued patents. The Burkett U.S. Pat. No. 5,161,627 disclosed that one could mount a diamond coated insert in a one-piece bit/bit holder body. A similar structure with a diamond coated tip is found at the Sionett U.S. Pat. No. 4,944,559. These diamond coatings have heretofore been formed in a standard process that includes high temperature, high pressure forming of same on a tungsten carbide high impact substrate.
A later version of the present applicant's prior invention of a quick change shank such as found in the U.S. Pat. No. 6,371,567 is provided in combination with a diamond tip and found at the Hall et al U.S. Pat. No. 8,118,371.
With diamond coated tips of road milling machinery, it has been found that the working life of the tip has been greatly increased. As such, it is no longer necessary to provide changeable bits in bit holders. The operating life of bits and bit holders are such that they can be physically combined in a unitary structure.
A need has developed for a lower cost combination diamond coated tip and front portion, formerly used on a removable bit, with a quick change bit holder and improvements in tools for inserting and removing same in their working mountings.
This disclosure relates generally to unitary bit/bit holder combination, tool, and/or pick assemblies for road milling, mining, and trenching equipment. One implementation of the teachings herein is a tool that includes a body comprising an annular trough and a forward extension axially extending from the annular trough to a forward end of the body; a shank extending axially from a bottom of the body; and an annular ring comprising a ring bore, the forward extension extending through the ring bore and axially above a forward end of the annular ring, and the carbide ring adapted to be seated and brazed in the annular trough of the body.
These and other aspects of the present disclosure are disclosed in the following detailed description of the embodiments, the appended claims and the accompanying figures.
The features of the present invention which are believed to be novel are set forth with particularity in the appended claims. The invention may best be understood from the following detailed description of currently preferred embodiments thereof taken in conjunction with the accompanying drawings wherein like numerals refer to like parts, and in which:
Referring to
Referring to
In the preferred embodiment 15, the shank 24 includes a lower resilient bit block bore engaging portion 27, and a millable shank portion 28 which may in this embodiment be a few thousandths of an inch. An uppermost part of the shank 30 immediately adjacent the larger body portion 21 includes a generally cylindrical portion having an annular outer surface sized to be press fit into the top of the bit block bore (not shown). As noted previously in U.S. Pat. Nos. 7,883,155, 6,685,273 and 6,371,567, the interference fit between the bottom shank portion 27 and a bit holder bore is substantially larger than a standard interference fit (0.001-0.003) for a solid shank, extending approximately 0.012 to 0.030 inches for a nominal 1½ inch diameter shank for use in road milling.
The upper or body portion 21 of the holder 15 includes a radially extending annular flange 31 defining the bottom of what is termed in the industry as a tire portion, diametrically the widest segment of a holder (about 2⅝ inch for a road milling holder). The height of the tire portion may approximate ½ inch and includes a pair of opposing wedge shape cutouts or wedge extraction notches 19-19. From the top of the tire portion, the body generally slopes radially inwardly at 32 and upwardly to perform a ramp-like function with the aim of moving material, macadam, concrete, etc. outwardly from the forward tip of the diamond covered leading portion 33 of the bit/holder. In this preferred embodiment, the mid section of the upper body portion of the holder 23 includes a generally cylindrical segment having at the bottom thereof a cross or through hole 22 substantially perpendicular to the longitudinal axis of the holder. This cross hole 22 extends horizontally through the body portion and forms a receiver for a drift pin 17, shown most clearly in
This upper cylindrical segment 23 of the preferred holder body 21 is, with the exception of the through hole 22 mentioned previously, generally solid and provides a substantial portion adding bulk and toughness to the combination bit/holder 15. As shown most clearly in
It should be noted that during assembly, only the top part of the bit body 23 is heated by an inductance coil surrounding same to a temperature just slightly over the melting point of the brazing discs used, i.e., about 1300 degrees F. The careful positioning of the inductance coils provides for heating a minimal area of the upper portion 21 of the bit/holder 15, thus minimally affecting the grain structure, hardness, toughness etc. of the holder itself.
Referring to
As shown in
A bore 20-20 horizontally through the walls of the female cup member 16 is sized and positioned to align with the through or cross bore 22 in the holder body 16 to allow a drift pin 17 to be loosely (slidably) positioned therethrough. The upper hollow or bored out portion of the cup member body fits over the diamond coated bit 33, tungsten carbide insert 40, and the tungsten annular ring 36 at the recess 35 in the top wall 34 of the holder body 21. The upper portion of the cup is, in this embodiment, tapered to a frustoconical shape 53 having a generally flat upper surface 54.
Referring to
Referring to
The diamond coated tip 33, 33a, 46 and 47 is brazed into the hollow cup forward portion 66 of the steel cup insert 65. The reasoning behind the addition of the cup shaped thick bottom 67 of the steel insert 65 relates to the ductility of the steel vs. the non-ductility of the tungsten carbide insert 40. The use of a solid bottomed 67 steel cup 65 member allows the ductility of that thick cylindrical bottom pad to cushion the repeated hammer blows received at the diamond coated tip 33a. This added ductility to the tip end 33a of the bit allows that bit/holder 15 to be used not only in removing MacAdam, but also in removing a concrete and other hardened and non-homogenous materials, thus giving added life and a widened field of use for the bit/holder combination 15 over previously known diamond coated bits. Further, the tungsten carbide to steel to tungsten carbide sequence of the disclosed modification yields substantially stronger bonds than brazing tungsten carbide to tungsten carbide.
Referring to
Referring to
The purpose of the extended initial portion of the steel annular ring 68 shown in
Next, the PCD or diamond insert 33a is positioned in recess 64 preferably over a silver brazing disc (not shown). This combination is then heated between 1,000-1,300 degrees F. by an induction heater (not shown) which encircles the upper tip portion of the bit holder 15a. The flow of heat through the annular steel ring 68 more effectively magnetically couples to the iron in the steel in the ring 68 to transfer heat to the tungsten carbide. The heat more efficiently goes through the steel to melt the flux and braze material between the insert 33a and the recess 64 of the forward tubular portion of the steel ring body 68. These two processes that join both the tungsten carbide annular ring 36a and the diamond tip insert 33a to the upper body 23a and recesses 69 and 64, respectively, of the inner annular ring 68 are made at two differing temperatures to provide a more stable unitary structure in the end-finished bit holder of the present invention.
Referring to
In this third embodiment of the bit holder 102, the shank 108 includes a lower or first tapered portion 122 running axially from a stepped shoulder 124 adjacent the distal end 112 of the shank 108. The stepped shoulder 124 is disposed between the lower tapered portion 122 and the distal end 112. A diameter of the stepped shoulder 124 increases, or steps up, in this embodiment, as it axially extends from the distal end 112 to the lower tapered portion 122. The first tapered portion 122 runs upwardly or axially from the stepped shoulder 124 of the shank 108 and terminates generally mid first slot 110 longitudinally. The shank 108 also includes an annular shoulder 126 separating the lower tapered portion 122 from an upper or second tapered portion 128 which extends from the shoulder 126 to generally adjacent to the top of the shank 108 or forward terminations 114, 120 of slots 110, 116, respectively. The annular shoulder 126 is disposed between the lower tapered portion 122 and the upper tapered portion 128. A diameter of the annular shoulder 126 decreases, or steps down, in this embodiment, as it axially extends from the lower tapered portion 122 to the upper tapered portion 128. In other embodiments, the lower portion 122 and/or the upper portion 128 of the shank 108 may comprise a generally cylindrical shape, a slight draw angle, or a slight draft angle. In yet other embodiments, the shank 108 can comprise many different configurations.
A generally cylindrical top portion 130 of the shank 108 extends from a position adjacent the top or upper terminations 114, 120 of slots 110, 116, respectively, towards a generally annular back flange 132 that denotes the base or the bottom of the body 106 of the bit holder 102. The top of the shank 108 may include a rounded junction 134 between the top portion 130 of the shank 108 and the generally annular flange 132 of the body 106 of the bit holder 102, which is provided to avoid sharp corners which may provide an area for stress cracks to begin. The generally annular flange 132 includes a pair of horizontal slots or wedge extraction notches 136-136 generally perpendicular to the longitudinal axis of the combination bit/holder, one on either side of the generally annular flange 132. The horizontal slots 136-136 are configured to receive a pair of bifurcated fork tines that may be inserted between the base of the body 106 of the bit holder 102 and a base block (not shown) into which the shank 108 of the unitary bit/holder 104 is inserted and retained by outward radial force in use.
A central bore 138 longitudinally and axially extending through the shank 108 of the bit holder 102 terminates at bore termination 140, which in this illustrated embodiment has a conical shape, which is approximately at the upper end of the shank 108. This allows the generally C-shaped annular sidewall of the shank 108 to radially contract when the shank 108 is mounted in a tapered and/or cylindrical bore in a base block (not shown).
In this third illustrated embodiment of the bit holder 102, the bit holder body 106 includes a generally cylindrical or annular upper body portion 142 depending from a forward end 144 of the upper body portion 142. A mediate body portion 146 subjacent the upper body portion 142 generally slopes axially and radially outwardly to a radially extending generally cylindrical tire portion 148.
The bit holder body 106, in order to provide superior brazing of a tungsten carbide ring 150 to the forward end 144 of the upper body portion 142, includes a forwardly extending annular collar 152 that is created on the bit holder body 106 to provide an annular trough 154 around a forward extension 156 of the bit holder body 106 onto which the annular ring 150 is mounted. In this illustrated embodiment, the annular collar 152 includes a cylindrical bottom inner wall 158 and a tapered top inner wall or countersink 160. The vertical outer wall of the collar 152 will keep brazing material from flowing outwardly of the joinder between the base of the ring 150 and the annular trough 154 on which the ring 150 is positioned. The annular trough 154 is therearound positioned perpendicular to the axis of the bit holder 102 from the smaller radially oriented annular upper or forward extension 156 (
In this exemplary implementation of the third embodiment of the bit holder 102, the forward extension 156 includes a generally cylindrical top portion 164 and an outwardly tapered bottom portion 166. The generally cylindrical top portion 164, which forms the unitary steel forward end of the tubular portion of the diamond tool body, includes a bore 178 that axially extends from the forward end 174 to a bore termination 180, which in this exemplary implementation is flat, adjacent the outwardly tapered bottom portion 166. The bore 178 provides a space for receiving the complementary shaped bit 100. The bit tip insert 100 comprises a base 182 and a tip 184 adjacent the base 182 that includes a parabolic curved section below an apex of the bit tip insert 100. This tip 184 can have a frustoconical shape, a flat generally cylindrical puck shape, a parabolic ballistic shape, a conical shape, and/or an arcuate shape. In this third embodiment, the base 182 includes a generally cylindrical sidewall 186 and a tapered section 190 that extends from the cylindrical sidewall 186 to a generally flat distal end 188 of the bit tip insert 100. In an alternate embodiment, the base 182 can include a tapered sidewall and the distal end 188 of the bit tip insert 100 can be conical, frustoconical, arcuate, or have a different configuration. In one exemplary implementation of the third embodiment, the bit tip insert 100 can have a diameter in the range of ½ inch to 1⅜ inches. The bit tip insert 100 may be a tungsten carbide insert or may be a tungsten carbide insert that includes an overlay 192 (
To assemble the combination diamond coated axially shortened bit 100 and bit holder 102 of the present disclosure and to form a unitary structure of a bit and bit holder construction of a bit/holder, tool, and/or pick 104, the annular tungsten carbide ring 150 is positioned around the forward extension 156 and brazed in the annular trough 154 of the bit holder body 106. The base 182 and the sidewall 186 of the bit tip insert 100 is brazed in the bore 178 of the forward extension 156 at the same time as the carbide ring 150 is brazed, using, for example, a disc shaped or ring shaped braze material, and also creating a high strength braze joint 196 (
Referring to
In this fourth embodiment of the bit holder 200, the shank 108 includes a lower or first tapered portion 122 running axially from a stepped shoulder 124 adjacent the distal end 112 of the shank 108. The stepped shoulder 124 is disposed between the lower tapered portion 122 and the distal end 112. A diameter of the stepped shoulder 124 increases, or steps up, in this embodiment, as it axially extends from the distal end 112 to the lower tapered portion 122. The first tapered portion 122 runs upwardly or axially from the stepped shoulder 124 of the shank 108 and terminates generally mid first slot 110 longitudinally. The shank 108 also includes an annular shoulder 126 separating the lower tapered portion 122 from an upper or second tapered portion 128 which extends from the shoulder 126 to generally adjacent to the top of the shank 108 or forward terminations 114, 120 of slots 110, 116, respectively. The annular shoulder 126 is disposed between the lower tapered portion 122 and the upper tapered portion 128. A diameter of the annular shoulder 126 decreases, or steps down, in this embodiment, as it axially extends from the lower tapered portion 122 to the upper tapered portion 128. In other embodiments, the lower portion 122 and/or the upper portion 128 of the shank 108 may comprise a generally cylindrical shape, a slight draw angle, or a slight draft angle. In yet other embodiments, the shank 108 can comprise many different configurations.
A generally cylindrical top portion 130 of the shank 108 extends from a position adjacent the top or upper terminations 114, 120 of slots 110, 116, respectively, towards a generally annular back flange 132 that denotes the base or the bottom of the body 106 of the bit holder 200. The top of the shank 108 may include a rounded junction 134 between the top portion 130 of the shank 108 and the generally annular flange 132 of the body 106 of the bit holder 102, which is provided to avoid sharp corners which may provide an area for stress cracks to begin. The generally annular flange 132 includes a pair of horizontal slots or wedge extraction notches 136-136 generally perpendicular to the longitudinal axis of the combination bit/holder, one on either side of the generally annular flange 132. The horizontal slots 136-136 are configured to receive a pair of bifurcated fork tines that may be inserted between the base of the body 106 of the bit holder 200 and a base block (not shown) into which the shank 108 of the unitary bit/holder 104 is inserted and retained by outward radial force in use.
A central bore 138 longitudinally and axially extending through the shank 108 of the bit holder 200 terminates at bore termination 140, which in this illustrated embodiment has a conical shape, which is approximately at the upper end of the shank 108. This allows the generally C-shaped annular sidewall of the shank 108 to radially contract when the shank 108 is mounted in a tapered and/or cylindrical bore in a base block (not shown).
In this fourth illustrated embodiment of the bit holder 200, the bit holder body 106 includes a generally cylindrical or annular upper body portion 142 depending from a forward end 144 of the upper body portion 142. A mediate body portion 146 subjacent the upper body portion 142 generally slopes axially and radially outwardly to a radially extending generally cylindrical tire portion 148.
The bit holder body 106, in order to provide superior brazing of a tungsten carbide ring 150 to the forward end 144 of the upper body portion 142, includes a forwardly extending annular collar 152 that is created on the bit holder body 106 to provide an annular trough 154 around a forward extension 156 of the bit holder body 106 onto which the annular ring 150 is mounted. In this illustrated embodiment, the annular collar 152 includes a cylindrical bottom inner wall 158 and a tapered top inner wall or countersink 160. The vertical outer wall of the collar 152 will keep brazing material from flowing outwardly of the joinder between the base of the ring 150 and the annular trough 154 on which the ring 150 is positioned. The annular trough 154 is therearound positioned perpendicular to the axis of the bit holder 200 from the smaller radially oriented annular upper or forward extension 202 (
In this exemplary implementation of the fourth embodiment of the bit holder 200, the forward extension 202 includes a generally cylindrical top portion 204 and an outwardly tapered bottom portion 206. The generally cylindrical top portion 204 forms the unitary steel forward end of the tubular portion of the diamond tool body and provides a forward surface 208 for receiving the complementary shaped bit 100. The bit tip insert 100 comprises a base 182 and a tip 184 adjacent the base 182 that includes a parabolic curved section below an apex of the bit tip insert 100. This tip 184 can have a frustoconical shape, a flat generally cylindrical puck shape, a parabolic ballistic shape, a conical shape, and/or an arcuate shape. In this fourth embodiment, the base 182 includes a generally cylindrical sidewall 186 and a tapered section 190 that extends from the cylindrical sidewall 186 to a generally flat distal end 188 of the bit tip insert 100. In an alternate embodiment, the base 182 can include a tapered sidewall and the distal end 188 of the bit tip insert 100 can be conical, frustoconical, arcuate, or have a different configuration. In one exemplary implementation of the fourth embodiment, the bit tip insert 100 can have a diameter in the range of ½ inch to 1⅜ inches. The bit tip insert 100 may be a tungsten carbide insert or may be a tungsten carbide insert that includes an overlay 192 (
To assemble the combination diamond coated axially shortened bit 100 and bit holder 200 of the present disclosure and to form a unitary structure of a bit and bit holder construction of a bit/holder, tool, and/or pick 104, the annular tungsten carbide ring 150 is positioned around the forward extension 202 is brazed in the annular trough 154 of the bit holder body 106. The distal end 188 and the sidewall 186 of the bit tip insert 100 is brazed to the forward surface 208 (
Referring to
In this fifth embodiment of the bit holder 210, the shank 108 includes a lower or first tapered portion 122 running axially from a stepped shoulder 124 adjacent the distal end 112 of the shank 108. The stepped shoulder 124 is disposed between the lower tapered portion 122 and the distal end 112. A diameter of the stepped shoulder 124 increases, or steps up, in this embodiment, as it axially extends from the distal end 112 to the lower tapered portion 122. The first tapered portion 122 runs upwardly or axially from the stepped shoulder 124 of the shank 108 and terminates generally mid first slot 110 longitudinally. The shank 108 also includes an annular shoulder 126 separating the lower tapered portion 122 from an upper or second tapered portion 128 which extends from the shoulder 126 to generally adjacent to the top of the shank 108 or forward terminations 114, 120 of slots 110, 116, respectively. The annular shoulder 126 is disposed between the lower tapered portion 122 and the upper tapered portion 128. A diameter of the annular shoulder 126 decreases, or steps down, in this embodiment, as it axially extends from the lower tapered portion 122 to the upper tapered portion 128. In other embodiments, the lower portion 122 and/or the upper portion 128 of the shank 108 may comprise a generally cylindrical shape, a slight draw angle, or a slight draft angle. In yet other embodiments, the shank 108 can comprise many different configurations.
A generally cylindrical top portion 130 of the shank 108 extends from a position adjacent the top or upper terminations 114, 120 of slots 110, 116, respectively, towards a generally annular back flange 132 that denotes the base or the bottom of the body 106 of the bit holder 210. The top of the shank 108 may include a rounded junction 134 between the top portion 130 of the shank 108 and the generally annular flange 132 of the body 106 of the bit holder 210, which is provided to avoid sharp corners which may provide an area for stress cracks to begin. The generally annular flange 132 includes a pair of horizontal slots or wedge extraction notches 136-136 generally perpendicular to the longitudinal axis of the combination bit/holder, one on either side of the generally annular flange 132. The horizontal slots 136-136 are configured to receive a pair of bifurcated fork tines that may be inserted between the base of the body 106 of the bit holder 210 and a base block (not shown) into which the shank 108 of the unitary bit/holder 104 is inserted and retained by outward radial force in use.
A central bore 138 longitudinally and axially extending through the shank 108 of the bit holder 210 terminates at bore termination 140, which in this illustrated embodiment has a conical shape, which is approximately at the upper end of the shank 108. This allows the generally C-shaped annular sidewall of the shank 108 to radially contract when the shank 108 is mounted in a tapered and/or cylindrical bore in a base block (not shown).
In this fifth illustrated embodiment of the bit holder 210, the bit holder body 106 includes a generally cylindrical or annular upper body portion 142 depending from a forward end 144 of the upper body portion 142. A mediate body portion 146 subjacent the upper body portion 142 generally slopes axially and radially outwardly to a radially extending generally cylindrical tire portion 148.
The bit holder body 106, in order to provide superior brazing of a tungsten carbide ring 150 to the forward end 144 of the upper body portion 142, includes a forwardly extending annular collar 152 that is created on the bit holder body 106 to provide an annular trough 154 around a forward extension 156 of the bit holder body 106 onto which the annular ring 150 is mounted. In this illustrated embodiment, the annular collar 152 includes a cylindrical bottom inner wall 158 and a tapered top inner wall or countersink 160. The vertical outer wall of the collar 152 will keep brazing material from flowing outwardly of the joinder between the base of the ring 150 and the annular trough 154 on which the ring 150 is positioned. The annular trough 154 is therearound positioned perpendicular to the axis of the bit holder 210 from the smaller radially oriented annular upper or forward extension 212 (
In this exemplary implementation of the fifth embodiment of the bit holder 210, the forward extension 212 includes the generally cylindrical top portion 214 and an outwardly tapered bottom portion 216. The forward extension 212, which forms the unitary steel forward end of the tubular portion of the diamond tool body, includes a bore 218 that axially extends from the forward end 174, through the generally cylindrical top portion 214 and partially through the tapered bottom portion 216, to a bore termination 220, which in this exemplary implementation is flat, adjacent the forward end 144 of the upper body portion 142. The bore 218 provides a space for receiving a generally cylindrical tungsten carbide extension plug 222 and the complementary shaped bit 100. The bit tip insert 100 comprises a base 182 and a tip 184 adjacent the base 182 that includes a parabolic curved section below an apex of the bit tip insert 100. This tip 184 can have a frustoconical shape, a flat generally cylindrical puck shape, a parabolic ballistic shape, a conical shape, and/or an arcuate shape. In this fifth embodiment, the base 182 includes a generally cylindrical sidewall 186 and a tapered section 190 that extends from the cylindrical sidewall 186 to a generally flat distal end 188 of the bit tip insert 100. In an alternate embodiment, the base 182 can include a tapered sidewall and the distal end 188 of the bit tip insert 100 can be conical, frustoconical, arcuate, or have a different configuration. In one exemplary implementation of the fifth embodiment, the bit tip insert 100 can have a diameter in the range of ½ inch to 1⅜ inches. The bit tip insert 100 may be a tungsten carbide insert or may be a tungsten carbide insert that includes an overlay 192 (
To assemble the combination diamond coated axially shortened bit 100 and bit holder 210 of the present disclosure to form a unitary structure bit and bit holder construction of a bit/holder, tool, and/or pick 104 (
Referring to
In this sixth embodiment of the bit holder 230, the shank 108 includes a lower or first tapered portion 122 running axially from a stepped shoulder 124 adjacent the distal end 112 of the shank 108. The stepped shoulder 124 is disposed between the lower tapered portion 122 and the distal end 112. A diameter of the stepped shoulder 124 increases, or steps up, in this embodiment, as it axially extends from the distal end 112 to the lower tapered portion 122. The first tapered portion 122 runs upwardly or axially from the stepped shoulder 124 of the shank 108 and terminates generally mid first slot 110 longitudinally. The shank 108 also includes an annular shoulder 126 separating the lower tapered portion 122 from an upper or second tapered portion 128 which extends from the shoulder 126 to generally adjacent to the top of the shank 108 or forward terminations 114, 120 of slots 110, 116, respectively. The annular shoulder 126 is disposed between the lower tapered portion 122 and the upper tapered portion 128. A diameter of the annular shoulder 126 decreases, or steps down, in this embodiment, as it axially extends from the lower tapered portion 122 to the upper tapered portion 128. In other embodiments, the lower portion 122 and/or the upper portion 128 of the shank 108 may comprise a generally cylindrical shape, a slight draw angle, or a slight draft angle. In yet other embodiments, the shank 108 can comprise many different configurations.
A generally cylindrical top portion 130 of the shank 108 extends from a position adjacent the top or upper terminations 114, 120 of slots 110, 116, respectively, towards a generally annular back flange 132 that denotes the base or the bottom of the body 106 of the bit holder 230. The top of the shank 108 may include a rounded junction 134 between the top portion 130 of the shank 108 and the generally annular flange 132 of the body 106 of the bit holder 230, which is provided to avoid sharp corners which may provide an area for stress cracks to begin. The generally annular flange 132 includes a pair of horizontal slots or wedge extraction notches 136-136 generally perpendicular to the longitudinal axis of the combination bit/holder, one on either side of the generally annular flange 132. The horizontal slots 136-136 are configured to receive a pair of bifurcated fork tines that may be inserted between the base of the body 106 of the bit holder 230 and a base block (not shown) into which the shank 108 of the unitary bit/holder 104 is inserted and retained by outward radial force in use.
A central bore 138 longitudinally and axially extending through the shank 108 of the bit holder 230 terminates at bore termination 140, which in this illustrated embodiment has a conical shape, which is approximately at the upper end of the shank 108. This allows the generally C-shaped annular sidewall of the shank 108 to radially contract when the shank 108 is mounted in a tapered and/or cylindrical bore in a base block (not shown).
In this sixth illustrated embodiment of the bit holder 230, the bit holder body 106 includes a generally cylindrical or annular upper body portion 142 depending from a forward end 144 of the upper body portion 142. A mediate body portion 146 subjacent the upper body portion 142 generally slopes axially and radially outwardly to a radially extending generally cylindrical tire portion 148.
The bit holder body 106, in order to provide superior brazing of a tungsten carbide ring 150 to the forward end 144 of the upper body portion 142, includes a forwardly extending annular collar 152 that is created on the bit holder body 106 to provide an annular trough 154 around a forward extension 232 of the bit holder body 106 onto which the annular ring 150 is mounted. In this illustrated embodiment, the annular collar 152 includes a cylindrical bottom inner wall 158 and a tapered top inner wall or countersink 160. The vertical outer wall of the collar 152 will keep brazing material from flowing outwardly of the joinder between the base of the ring 150 and the annular trough 154 on which the ring 150 is positioned. The annular trough 154 is therearound positioned perpendicular to the axis of the bit holder 230 from the smaller radially oriented annular upper or forward extension 232 (
In this exemplary implementation of the sixth embodiment of the bit holder 230, the forward extension 232 includes the generally cylindrical top portion 234 and an outwardly tapered bottom portion 236. The forward extension 232, which forms the unitary steel forward end of the tubular portion of the diamond tool body, includes a bore 238 that axially extends from the forward end 174, through the generally cylindrical top portion 234 and partially through the tapered bottom portion 236, to a bore termination 240. In this illustrated exemplary embodiment, the bore 238 includes a generally cylindrical bore section 242 that axially extends from the forward end 174 through the generally cylindrical top portion 234 to a location adjacent the tapered bottom portion 236, a tapered bore section 244 that axially extends from a distal end 246 of the generally cylindrical bore section 242 to the bore termination 240, which in this exemplary implementation is conical, adjacent the forward end 144 of the upper body portion 142. The bore 238 provides a space for receiving a tapered tungsten carbide extension plug 248 and the complementary shaped bit 100. The bit tip insert 100 comprises a base 182 and a tip 184 adjacent the base 182 that includes a parabolic curved section below an apex of the bit tip insert 100. This tip 184 can have a frustoconical shape, a flat generally cylindrical puck shape, a parabolic ballistic shape, a conical shape, and/or an arcuate shape. In this sixth embodiment, the base 182 includes a generally cylindrical sidewall 186 and a tapered section 190 that extends from the cylindrical sidewall 186 to a generally flat distal end 188 of the bit tip insert 100. In an alternate embodiment, the base 182 can include a tapered sidewall and the distal end 188 of the bit tip insert 100 can be conical, frustoconical, arcuate, or have a different configuration. In one exemplary implementation of the sixth embodiment, the bit tip insert 100 can have a diameter in the range of ½ inch to 1⅜ inches. The bit tip insert 100 may be a tungsten carbide insert or may be a tungsten carbide insert that includes an overlay 192 (
To assemble the combination diamond coated axially shortened bit 100 and bit holder 230 of the present disclosure to form a unitary structure bit and bit holder construction of a bit/holder, tool, and/or pick 104, the annular tungsten carbide ring 150 is positioned around the forward extension 232 and brazed in the annular trough 154 of the bit holder body 106. The base 182 and the sidewall 186 of the bit tip insert 100 is brazed to a forward end 250 of the tungsten carbide extension plug 248 at the same time as the carbide ring 150, using, for example, a disc shaped or ring shaped braze material, and also creating a high strength braze joint 254 (
Referring to
In this seventh embodiment of the bit holder 262, the shank 268 includes a lower or first tapered portion 282 running axially from a stepped shoulder 284 adjacent the distal end 272 of the shank 268. The stepped shoulder 284 is disposed between the lower tapered portion 282 and the distal end 272. A diameter of the stepped shoulder 284 increases, or steps up, in this embodiment, as it axially extends from the distal end 272 to the lower tapered portion 282. The first tapered portion 282 runs upwardly or axially from the stepped shoulder 284 of the shank 268 and terminates generally mid first slot 270 longitudinally. The shank 268 also includes an annular shoulder 286 separating the lower tapered portion 282 from an upper or second tapered portion 288 which extends from the shoulder 286 to generally adjacent to the top of the shank 268 or forward terminations 274, 280 of slots 270, 276, respectively. The annular shoulder 286 is disposed between the lower tapered portion 282 and the upper tapered portion 288. A diameter of the annular shoulder 286 decreases, or steps down, in this embodiment, as it axially extends from the lower tapered portion 282 to the upper tapered portion 288. In other embodiments, the lower portion 282 and/or the upper portion 288 of the shank 268 may comprise a generally cylindrical shape, a slight draw angle, or a slight draft angle. In yet other embodiments, the shank 268 can comprise many different configurations.
A generally cylindrical top portion 290 of the shank 268 extends from a position adjacent the top or upper terminations 274, 280 of slots 270, 276, respectively, towards a generally annular back flange 292 that denotes the base or the bottom of the body 266 of the bit holder 262. The top of the shank 268 may include a rounded junction 294 between the top portion 290 of the shank 268 and the generally annular flange 292 of the body 266 of the bit holder 262, which is provided to avoid sharp corners which may provide an area for stress cracks to begin. The generally annular flange 292 includes a pair of horizontal slots or wedge extraction notches 296-296 generally perpendicular to the longitudinal axis of the combination bit/holder, one on either side of the generally annular flange 292. The horizontal slots 296-296 are configured to receive a pair of bifurcated fork tines that may be inserted between the base of the body 266 of the bit holder 262 and a first embodiment of a base block 350 into which the shank 268 of the unitary bit/holder 264 is inserted and retained in a bore 352 of the base block 350 by outward radial force in use.
A central bore 298 longitudinally and axially extending through the shank 268 of the bit holder 262 terminates at bore termination 200, which in this illustrated embodiment has a conical shape, which is approximately at the upper end of the shank 268. This allows the generally C-shaped annular sidewall of the shank 268 to radially contract when the shank 108 is mounted in the tapered and/or generally cylindrical bore 352 in the base block 350.
In this seventh illustrated embodiment of the bit holder 262, the bit holder body 266 includes a generally cylindrical or annular upper body portion 302 depending from a forward end 304 of the upper body portion 302. A mediate body portion 306 subjacent the upper body portion 302 generally slopes axially and radially outwardly to a radially extending generally cylindrical tire portion 308.
The bit holder body 266, in order to provide superior brazing of a tungsten carbide ring 310 to the forward end 304 of the upper body portion 302, includes a forwardly extending annular collar 312 that is created on the bit holder body 266 to provide an annular trough 314 around a forward extension 316 of the bit holder body 266 onto which the annular ring 310 is mounted. In this illustrated embodiment, the annular collar 312 includes a cylindrical bottom inner wall 318 and a tapered top inner wall or countersink 320. The vertical outer wall of the collar 312 will keep brazing material from flowing outwardly of the joinder between the base of the ring 310 and the annular trough 314 on which the ring 310 is positioned. The annular trough 314 is therearound positioned perpendicular to the axis of the bit holder 262 from the smaller radially oriented annular upper or forward extension 316. Around this forward extension 316 is fitted the annular tungsten carbide ring 310, the forward extension 316 extending through a bore 322 that extends through the annular tungsten carbide ring 310 allowing a bottom of the ring 310 to be seated in the annular trough 314, which may be brazed into unitary construction with the remainder of the bit holder 262. In this illustrated embodiment, the bore 322 of the annular tungsten carbide ring 310 is tapered from a distal end 324 of the ring 310 to a forward end 326 of the ring 310, as shown in
In this exemplary implementation of the seventh embodiment of the bit holder 262, the forward extension 316 includes a generally cylindrical top portion 332 and an outwardly tapered bottom portion 334. The generally cylindrical top portion 332, which forms the unitary steel forward end of the tubular portion of the diamond tool body, includes a bore 336 that axially extends from the forward end 330 to a bore termination 338, which in this exemplary implementation is flat, adjacent the outwardly tapered bottom portion 334. The bore 336 provides a space for receiving the complementary shaped bit 260. The bit tip insert 260 comprises a base 340 that includes a parabolic curved section below an apex of the bit tip insert 260. This bit tip insert 260 can also have a frustoconical shape, a flat generally cylindrical puck shape, a parabolic ballistic shape, a conical shape, and/or an arcuate shape. In this seventh embodiment, the base 340 includes a generally cylindrical sidewall 342 and a tapered section 344 that extends from the cylindrical sidewall 342 to a generally flat distal end 346 of the bit tip insert 260. In an alternate embodiment, the base 340 can include a tapered sidewall and the distal end 346 of the bit tip insert 260 can be conical, frustoconical, arcuate, or have a different configuration. In one exemplary implementation of the seventh embodiment, the bit tip insert 260 can have a diameter in the range of ½ inch to 1⅜ inches. The bit tip insert 260 may be a tungsten carbide insert or may be a tungsten carbide insert that includes an overlay 348 (
To assemble the combination diamond coated axially shortened bit 260 and bit holder 262 of the present disclosure and to form a unitary structure of a bit and bit holder construction of a bit/holder, tool, and/or pick 264, the annular tungsten carbide ring 310 is positioned around the forward extension 316 and brazed in the annular trough 314 of the bit holder body 266. The base 340 and the sidewall 342 of the bit tip insert 260 is brazed in the bore 336 of the forward extension 316 at the same time as the carbide ring 310 is brazed, using, for example, a disc shaped or ring shaped braze material and/or flux material, and also creating a high strength braze joint, which may then be optionally hardened. This braze joint secures the bottom of the tungsten carbide base 340 of the bit tip insert 260 to the bore termination 338 of the bore 336 of the cylindrical top portion 332 of the forward extension 316, at the forward end 330 of the diamond tool body 266. In this seventh embodiment, the extended annular sidewall 333 of the cylindrical top portion 332 of the forward extension 316 remains in place, as shown in
Alternatively, furnace brazing in an atmospherically controlled environment is used to assemble the unitary bit/holder, tool, and/or pick 264, which does not require a flux material to protect the braze joint regions. The atmospherically controlled furnace involves only an inert gas atmosphere, free of oxygen. The diamond unitary bit/holder, tool, and/or pick 264 is vertically positioned, heated, and brazed in this furnace setting. With the flux material removed, the braze material is tightly positioned underneath the base of the PDC insert. The braze material would have a higher melting point that would be closer to the austenitizing temperature, approximately 1,600 degrees Fahrenheit, for hardening the steel body of the bit holder. There is no damaging effect, up to 2,000 degrees Fahrenheit, to the PDC insert diamond layer in an atmospherically controlled furnace at the required temperature to properly harden the diamond tool metal body. A crimped feature on the annular sidewall 333 allows the physical handling of this design and still provides the satisfactory furnace braze joint since the steel crimped feature tightly keeps this assembly together.
The annular tungsten carbide ring 310 is positioned around the forward extension 316 and brazed in the annular trough 314 of the bit holder body 266 and the base 340 and the sidewall 342 of the bit tip insert 260 is brazed in the bore 336 of the forward extension 316 at the same time as the carbide ring 310 is brazed, using, for example, a disc shaped or ring shaped braze material, creating a high strength braze joint, in the atmospherically controlled furnace. This braze joint secures the bottom and sidewall of the tungsten carbide base 340 of the bit tip insert 260 to the bore termination 338 of the bore 336 of the cylindrical top portion 332 of the forward extension 316, at the forward end 330 of the diamond tool body 266. In this seventh embodiment, the crimped extended annular sidewall 333 of the cylindrical top portion 332 of the forward extension 316 remains in place after brazing the bit tip insert 260 in the bore 336, however, the annular sidewall 333 will be quickly worn away by the abrasive action of the cut material.
Referring to
Referring to
In this eighth embodiment of the bit holder 382, the shank 388 includes a lower or first tapered portion 396 running axially from a stepped shoulder 398 adjacent the distal end 392 of the shank 388. The stepped shoulder 398 is disposed between the lower tapered portion 396 and the distal end 392. A diameter of the stepped shoulder 398 increases, or steps up, in this embodiment, as it axially extends from the distal end 392 to the lower tapered portion 396. The first tapered portion 396 runs upwardly or axially from the stepped shoulder 398 of the shank 388 and terminates generally mid first slot 390 longitudinally. The shank 388 also includes an annular shoulder 400 separating the lower tapered portion 396 from an upper or second tapered portion 402 which extends from the shoulder 400 to generally adjacent to the top of the shank 388 or forward termination 394 of slot 390. The annular shoulder 400 is disposed between the lower tapered portion 396 and the upper tapered portion 402. A diameter of the annular shoulder 402 decreases, or steps down, in this embodiment, as it axially extends from the lower tapered portion 396 to the upper tapered portion 402. In other embodiments, the lower portion 396 and/or the upper portion 402 of the shank 388 may comprise a generally cylindrical shape, a slight draw angle, or a slight draft angle. In yet other embodiments, the shank 388 can comprise many different configurations.
A generally cylindrical top portion 404 of the shank 388 extends from a position adjacent the top or upper termination 394 of slot 390 towards a generally annular back flange 406 that denotes the base or the bottom of the body 386 of the bit holder 382. The top of the shank 388 may include a rounded junction 408 between the top portion 404 of the shank 388 and the generally annular flange 406 of the body 386 of the bit holder 382, which is provided to avoid sharp corners which may provide an area for stress cracks to begin. The generally annular flange 406 includes a pair of horizontal slots or wedge extraction notches 410-410 generally perpendicular to the longitudinal axis of the combination bit/holder, one on either side of the generally annular flange 406. The horizontal slots 410-410 are configured to receive a pair of bifurcated fork tines that may be inserted between the base of the body 386 of the bit holder 382 and the second embodiment of the base block 360 into which the shank 388 of the unitary bit/holder 384 is inserted and retained in a bore 362 of the bore 360 by outward radial force in use.
A central bore 412 longitudinally and axially extending through the shank 388 of the bit holder 382 terminates at bore termination 414, which in this illustrated embodiment has a conical shape, which is approximately at the upper end of the shank 388. This allows the generally C-shaped annular sidewall of the shank 388 to radially contract when the shank 388 is mounted in the tapered and/or cylindrical bore 362 of the base block 288.
In this eighth illustrated embodiment of the bit holder 382, the bit holder body 386 includes a generally cylindrical or annular upper body portion 416 depending from a forward end 418 of the upper body portion 416. A mediate body portion 420 subjacent the upper body portion 416 generally slopes axially and radially outwardly to a radially extending generally cylindrical tire portion 422.
The bit holder body 386, in order to provide superior brazing of a tungsten carbide ring 424 to the forward end 418 of the upper body portion 416, includes a forwardly extending annular collar 426 that is created on the bit holder body 386 to provide an annular trough 428 around a forward extension 430 of the bit holder body 386 onto which the annular ring 424 is mounted. In this illustrated embodiment, the annular collar 426 includes a cylindrical bottom inner wall 432 and a tapered top inner wall or countersink 434. The vertical outer wall of the collar 426 will keep brazing material from flowing outwardly of the joinder between the base of the ring 424 and the annular trough 428 on which the ring 424 is positioned. The annular trough 428 is therearound positioned perpendicular to the axis of the bit holder 382 from the smaller radially oriented annular upper or forward extension 430. Around this forward extension 430 is fitted the annular tungsten carbide ring 424, the forward extension 430 extending through a bore 436 that extends through the annular tungsten carbide ring 424 allowing a bottom of the ring 424 to be seated in the annular trough 428, which may be brazed into unitary construction with the remainder of the bit holder 382. In this illustrated embodiment, the bore 436 of the annular tungsten carbide ring 424 is tapered from a distal end 438 of the ring 424 to a forward end 440 of the ring 424, as shown in
In this exemplary implementation of the eighth embodiment of the bit holder 382, the forward extension 430 includes a generally cylindrical top portion 446 and an outwardly tapered bottom portion 448. The generally cylindrical top portion 446, which forms the unitary steel forward end of the tubular portion of the diamond tool body, includes a bore 450 that axially extends from the forward end 444 to a bore termination 452, which in this exemplary implementation is flat, adjacent the outwardly tapered bottom portion 448. The bore 450 provides a space for receiving the complementary shaped bit 380. The bit tip insert 380 comprises a base 454 that includes a parabolic curved section or frustoconical section below an apex of the bit tip insert 380. This bit tip insert 380 can also have a frustoconical shape, a flat generally cylindrical puck shape, a parabolic ballistic shape, a conical shape, and/or an arcuate shape. In this eighth embodiment, the base 454 includes a generally cylindrical sidewall 456 and a tapered section 458 that extends from the cylindrical sidewall 456 to a generally flat distal end 460 of the bit tip insert 360. In an alternate embodiment, the base 454 can include a tapered sidewall and the distal end 460 of the bit tip insert 380 can be conical, frustoconical, arcuate, or have a different configuration. In one exemplary implementation of the eighth embodiment, the bit tip insert 380 can have a diameter in the range of ½ inch to 1⅜ inches. The bit tip insert 380 may be a tungsten carbide insert or may be a tungsten carbide insert that includes an overlay 462 (
To assemble the combination diamond coated axially shortened bit 380 and bit holder 382 of the present disclosure and to form a unitary structure of a bit and bit holder construction of a bit/holder, tool, and/or pick 384, a brazing ring 464 (
Alternatively, furnace brazing in an atmospherically controlled environment is used to assemble the unitary bit/holder, tool, and/or pick 384, which does not require a flux material to protect the braze joint regions. The atmospherically controlled furnace involves only an inert gas atmosphere, free of oxygen. The diamond unitary bit/holder, tool, and/or pick 384 is vertically positioned, heated, and brazed in this furnace setting. With the flux material removed, the braze material is tightly positioned underneath the base of the PDC insert. The braze material would have a higher melting point that would be closer to the austenitizing temperature, approximately 1,600 degrees Fahrenheit, for hardening the steel body of the bit holder. There is no damaging effect, up to 2,000 degrees Fahrenheit, to the PDC insert diamond layer in an atmospherically controlled furnace at the required temperature to properly harden the diamond tool metal body. A crimped feature on the annular sidewall 447 allows the physical handling of this design and still provides the satisfactory furnace braze joint since the steel crimped feature tightly keeps this assembly together.
The annular tungsten carbide ring 424 is positioned around the forward extension 430 and brazed in the annular trough 428 of the bit holder body 386 and the base 454 and the sidewall 456 of the bit tip insert 380 is brazed in the bore 450 of the forward extension 430 at the same time as the carbide ring 424 is brazed, using, for example, brazing ring 464 and brazing disc 466, creating a high strength braze joint, in the atmospherically controlled furnace. This braze joint secures the bottom and sidewall of the tungsten carbide base 454 of the bit tip insert 380 to the bore termination 452 of the bore 450 of the cylindrical top portion 446 of the forward extension 430, at the forward end 444 of the diamond tool body 386. In this eighth embodiment, the crimped extended annular sidewall 447 of the cylindrical top portion 446 of the forward extension 430 remains in place after brazing the bit tip insert 380 in the bore 450, however, the annular sidewall 447 will be quickly worn away by the abrasive action of the cut material.
Referring to
In this ninth embodiment of the bit holder 472, the shank 478 includes a lower or first tapered portion 492 (
A generally cylindrical top portion 500 (
A central bore 508 (
In this ninth illustrated embodiment of the bit holder 472, the bit holder body 476 includes a generally cylindrical or annular upper body portion 512 depending from a forward end 514 of the upper body portion 512. A mediate body portion 516 subjacent the upper body portion 512 generally slopes axially and radially outwardly to a radially extending generally cylindrical tire portion 518.
The bit holder body 476, in order to provide superior brazing of a tungsten carbide ring 520 to the forward end 514 of the upper body portion 512, includes a forwardly extending annular collar 522 (
In this exemplary implementation of the ninth embodiment of the bit holder 472, the forward extension 526 includes a generally cylindrical top portion 542 and an outwardly tapered bottom portion 544 (
The bit tip insert 470 comprises a base 552 (
To assemble the combination diamond coated axially shortened bit 470 and bit holder 472 of the present disclosure and to form a unitary structure of a bit and bit holder construction of a bit/holder, tool, and/or pick 474, the annular tungsten carbide ring 520 is positioned around the forward extension 526 and brazed in the annular trough 524 of the bit holder body 476. The base 552 and the sidewall 554 of the bit tip insert 470 is brazed in the bore 548 of the forward extension 526 at the same time as the carbide ring 520 is brazed, using, for example, a disc shaped or ring shaped braze material and/or flux material, and also creating a high strength braze joint, which may then be optionally hardened. The braze material 562 covers the base 552 and sidewall 554 of the bit tip insert 470, as shown in
Alternatively, furnace brazing in an atmospherically controlled environment is used to assemble the unitary bit/holder, tool, and/or pick 474, which does not require a flux material to protect the braze joint regions. The atmospherically controlled furnace involves only an inert gas atmosphere, free of oxygen. The diamond unitary bit/holder, tool, and/or pick 474 is vertically positioned, heated, and brazed in this furnace setting. With the flux material removed, the braze material is tightly positioned underneath the base of the PDC insert. The braze material would have a higher melting point that would be closer to the austenitizing temperature, approximately 1,600 degrees Fahrenheit, for hardening the steel body of the bit holder. There is no damaging effect, up to 2,000 degrees Fahrenheit, to the PDC insert diamond layer in an atmospherically controlled furnace at the required temperature to properly harden the diamond tool metal body. The crimped forward end 546 allows the physical handling of this design and still provides the satisfactory furnace braze joint since the steel crimped feature tightly keeps this assembly together.
The annular tungsten carbide ring 520 is positioned around the forward extension 526 and brazed in the annular trough 524 of the bit holder body 476 and the base 552 and the sidewall 554 of the bit tip insert 470 is brazed in the bore 548 of the forward extension 526 at the same time as the carbide ring 520 is brazed, using, for example, a disc shaped or ring shaped braze material, creating a high strength braze joint, in the atmospherically controlled furnace. This braze joint secures the bottom and sidewall of the tungsten carbide base 552 of the bit tip insert 470 to the bore termination 550 of the bore 548 of the cylindrical top portion 542 of the forward extension 526, at the forward end 540 of the diamond tool body 476. In this ninth embodiment, the crimped extended annular sidewall 543 of the cylindrical top portion 542 of the forward extension 526 remains in place after brazing the bit tip insert 470 in the bore 548, however, the annular sidewall 526 will be quickly worn away by the abrasive action of the cut material.
Referring to
In this tenth embodiment of the bit holder 572, the shank 576 includes a lower or first tapered portion 586 (
A generally cylindrical top portion 594 (
A central bore 602 (
In this tenth illustrated embodiment of the bit holder 572, the bit holder body 576 includes a generally cylindrical or annular upper body portion 606 depending from a forward end 608 of the upper body portion 606. A mediate body portion 610 subjacent the upper body portion 606 generally slopes axially and radially outwardly to a radially extending generally cylindrical tire portion 612.
The bit holder body 576, in order to provide superior brazing of a tungsten carbide ring 614 to the forward end 608 of the upper body portion 606, includes a forwardly extending annular collar 616 (
In this exemplary implementation of the tenth embodiment of the bit holder 572, the forward extension 620 includes a generally cylindrical top portion 636 and an outwardly tapered bottom portion 638. The generally cylindrical top portion 636, which forms the unitary steel forward end of the tubular portion of the diamond tool body, includes a crimped forward end 640, shown in
The bit tip insert 570 comprises a base 646 (
To assemble the combination diamond coated axially shortened bit 570 and bit holder 572 of the present disclosure and to form a unitary structure of a bit and bit holder construction of a bit/holder, tool, and/or pick 574, the annular tungsten carbide ring 614 is positioned around the forward extension 620 and brazed in the annular trough 618 of the bit holder body 576. The base 646 and the sidewall 648 of the bit tip insert 570 is brazed in the bore 642 of the forward extension 620 at the same time as the carbide ring 614 is brazed, using, for example, a disc shaped or ring shaped braze material and/or flux material, and also creating a high strength braze joint, which may then be optionally hardened. The braze material covers the base 646 and sidewall 648 of the bit tip insert 570 in the finished condition. This braze joint secures the bottom of the tungsten carbide base 646 of the bit tip insert 570 to the bore termination 644 of the bore 642 of the cylindrical top portion 636 of the forward extension 620, at the forward end 634 of the diamond tool body 576. The forward end 634 of the generally cylindrical top portion 636 is then crimped with a multi-pointed circular die (not shown). The structure forms side-by-side chevrons or saw teeth around the outside circular (annular) top portion. The valleys in the saw teeth are pointed tabs and are bent inwardly to aid in retaining the bit tip insert brazed in the forward end bore 642. In this tenth embodiment, the extended annular sidewall 637 of the cylindrical top portion 636 of the forward extension 620 remains in place, as shown in
Alternatively, furnace brazing in an atmospherically controlled environment is used to assemble the unitary bit/holder, tool, and/or pick 574, which does not require a flux material to protect the braze joint regions. The atmospherically controlled furnace involves only an inert gas atmosphere, free of oxygen. The diamond unitary bit/holder, tool, and/or pick 574 is vertically positioned, heated, and brazed in this furnace setting. With the flux material removed, the braze material is tightly positioned underneath the base of the PDC insert. The braze material would have a higher melting point that would be closer to the austenitizing temperature, approximately 1,600 degrees Fahrenheit, for hardening the steel body of the bit holder. There is no damaging effect, up to 2,000 degrees Fahrenheit, to the PDC insert diamond layer in an atmospherically controlled furnace at the required temperature to properly harden the diamond tool metal body. The crimped forward end 640 allows the physical handling of this design and still provides the satisfactory furnace braze joint since the steel crimped feature tightly keeps this assembly together.
The annular tungsten carbide ring 614 is positioned around the forward extension 620 and brazed in the annular trough 618 of the bit holder body 576 and the base 646 and the sidewall 648 of the bit tip insert 570 is brazed in the bore 642 of the forward extension 620 at the same time as the carbide ring 614 is brazed, using, for example, a disc shaped or ring shaped braze material, creating a high strength braze joint, in the atmospherically controlled furnace. This braze joint secures the bottom and sidewall of the tungsten carbide base 646 of the bit tip insert 570 to the bore termination 644 of the bore 642 of the cylindrical top portion 636 of the forward extension 620, at the forward end 634 of the diamond tool body 576. In this tenth embodiment, the crimped extended annular sidewall 637 of the cylindrical top portion 636 of the forward extension 620 remains in place after brazing the bit tip insert 570 in the bore 642, however, the annular sidewall 637 will be quickly worn away by the abrasive action of the cut material.
Referring to
In this eleventh embodiment of the bit holder 662, the shank 668 includes a lower or first tapered portion 682 running axially from a stepped shoulder 684 adjacent the distal end 672 of the shank 668. The stepped shoulder 684 is disposed between the lower tapered portion 682 and the distal end 672. A diameter of the stepped shoulder 684 increases, or steps up, in this embodiment, as it axially extends from the distal end 672 to the lower tapered portion 682. The first tapered portion 682 runs upwardly or axially from the stepped shoulder 684 of the shank 668 and terminates generally mid first slot 670 longitudinally. The shank 668 also includes an annular shoulder 686 separating the lower tapered portion 682 from an upper or second tapered portion 688 which extends from the shoulder 686 to generally adjacent to the top of the shank 668 or forward terminations 674, 680 of slots 670, 676, respectively. The annular shoulder 686 is disposed between the lower tapered portion 682 and the upper tapered portion 688. A diameter of the annular shoulder 686 decreases, or steps down, in this embodiment, as it axially extends from the lower tapered portion 682 to the upper tapered portion 688. In other embodiments, the lower portion 682 and/or the upper portion 688 of the shank 668 may comprise a generally cylindrical shape, a slight draw angle, or a slight draft angle. In yet other embodiments, the shank 668 can comprise many different configurations.
A generally cylindrical top portion 690 of the shank 668 extends from a position adjacent the top or upper terminations 674, 680 of slots 670, 676, respectively, towards a generally annular back flange 692 (
A central bore 698 (
In this eleventh illustrated embodiment of the bit holder 662, the bit holder body 666 includes a generally cylindrical or annular upper body portion 702 depending from a forward end 704 of the upper body portion 702. A mediate body portion 706 subjacent the upper body portion 702 generally slopes axially and radially outwardly to a radially extending generally cylindrical tire portion 708.
The bit holder body 666, in order to provide superior brazing of a tungsten carbide ring 710 to the forward end 704 of the upper body portion 702, includes a forwardly extending annular collar 712 (
In this exemplary implementation of the eleventh embodiment of the bit holder 662, the forward extension 716 includes a generally cylindrical top portion 732 and an outwardly tapered bottom portion 734. The generally cylindrical top portion 732, which forms the unitary steel forward end of the tubular portion of the diamond tool body, includes a crimped forward end 736, shown in
The bit tip insert 660 comprises a base 742 that includes a parabolic curved section below an apex of the bit tip insert 660. This bit tip insert 660 can also have a frustoconical shape, a flat generally cylindrical puck shape, a parabolic ballistic shape, a conical shape, and/or an arcuate shape. In this eleventh embodiment, the base 742 includes a generally cylindrical sidewall 744 and a tapered section 746 that extends from the cylindrical sidewall 744 to a generally flat distal end 748 of the bit tip insert 660, as shown in
To assemble the combination diamond coated axially shortened bit 660 and bit holder 662 of the present disclosure and to form a unitary structure of a bit and bit holder construction of a bit/holder, tool, and/or pick 664, a brazing ring 752 with flux (
Alternatively, furnace brazing in an atmospherically controlled environment is used to assemble the unitary bit/holder, tool, and/or pick 664, which does not require a flux material to protect the braze joint regions. The atmospherically controlled furnace involves only an inert gas atmosphere, free of oxygen. The diamond unitary bit/holder, tool, and/or pick 664 is vertically positioned, heated, and brazed in this furnace setting. With the flux material removed, the braze material is tightly positioned underneath the base of the PDC insert. The braze material would have a higher melting point that would be closer to the austenitizing temperature, approximately 1,600 degrees Fahrenheit, for hardening the steel body of the bit holder. There is no damaging effect, up to 2,000 degrees Fahrenheit, to the PDC insert diamond layer in an atmospherically controlled furnace at the required temperature to properly harden the diamond tool metal body. The crimped forward end 736 allows the physical handling of this design and still provides the satisfactory furnace braze joint since the steel crimped feature tightly keeps this assembly together.
As described above, the annular tungsten carbide ring 710 is positioned around the forward extension 716 and brazed in the annular trough 714 of the bit holder body 666 and the base 742 and the sidewall 744 of the bit tip insert 660 is brazed in the bore 738 of the forward extension 716 at the same time as the carbide ring 710 is brazed, using, for example, brazing ring 752 and brazing disc 754, creating a high strength braze joint, in the atmospherically controlled furnace. This braze joint secures the bottom and sidewall of the tungsten carbide base 742 of the bit tip insert 660 to the bore termination 740 of the bore 738 of the cylindrical top portion 732 of the forward extension 716, at the forward end 730 of the diamond tool body 666. In this tenth embodiment, the crimped extended annular sidewall 733 of the cylindrical top portion 732 of the forward extension 716 remains in place after brazing the bit tip insert 660 in the bore 738, however, the annular sidewall 733 will be quickly worn away by the abrasive action of the cut material.
As used in this application, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or”. That is, unless specified otherwise, or clear from context, “X includes A or B” is intended to mean any of the natural inclusive permutations. That is, if X includes A; X includes B; or X includes both A and B, then “X includes A or B” is satisfied under any of the foregoing instances. In addition, “X includes at least one of A and B” is intended to mean any of the natural inclusive permutations. That is, if X includes A; X includes B; or X includes both A and B, then “X includes at least one of A and B” is satisfied under any of the foregoing instances. The articles “a” and “an” as used in this application and the appended claims should generally be construed to mean “one or more” unless specified otherwise or clear from context to be directed to a singular form. Moreover, use of the term “an implementation” or “one implementation” throughout is not intended to mean the same embodiment, aspect or implementation unless described as such.
While the present disclosure has been described in connection with certain embodiments and measurements, it is to be understood that the present disclosure is not to be limited to the disclosed embodiments and measurements but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims, which scope is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures as is permitted under the law.
This invention claims priority to U.S. Provisional Application No. 61/879,353, filed Sep. 18, 2013, claims priority to and is a continuation-in-part of U.S. Non-provisional application Ser. No. 14/487,493, filed Sep. 16, 2014, now U.S. Pat. No. 9,909,416, issued Mar. 6, 2018, claims priority to U.S. Provisional Application No. 61/983,291, filed Apr. 23, 2014, claims priority to and is a continuation-in-part of U.S. Non-provisional application Ser. No. 14/690,679, filed Apr. 20, 2015, claims priority to and is a continuation-in-part of U.S. Non-provisional application Ser. No. 15/879,078, filed Jan. 24, 2018, and claims priority to and is a continuation-in-part of U.S. Non-provisional application Ser. No. 16/038,416, filed Jul. 18, 2018, to the extent allowed by law and the contents of which are incorporated herein by reference in their entireties.
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| Number | Date | Country |
|---|---|---|
| 102004049710 | Apr 2006 | DE |
| 102011079115 | Jan 2013 | DE |
| 202012100353 | Jun 2013 | DE |
| 102015121953 | Jul 2016 | DE |
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| 2009006612 | Jan 2009 | WO |
| Number | Date | Country | |
|---|---|---|---|
| 61879353 | Sep 2013 | US | |
| 61983291 | Apr 2014 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 16038416 | Jul 2018 | US |
| Child | 16390466 | US | |
| Parent | 14487493 | Sep 2014 | US |
| Child | 16038416 | US | |
| Parent | 14690679 | Apr 2015 | US |
| Child | 16390466 | US | |
| Parent | 15879078 | Jan 2018 | US |
| Child | 14690679 | US |
