Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3830321 A
Publication typeGrant
Publication dateAug 20, 1974
Filing dateFeb 20, 1973
Priority dateFeb 20, 1973
Also published asCA1003864A, CA1003864A1, DE2407746A1, DE2407746B2, DE2407746C3
Publication numberUS 3830321 A, US 3830321A, US-A-3830321, US3830321 A, US3830321A
InventorsCollege M, Mc Kenry R
Original AssigneeKennametal Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Excavating tool and a bit for use therewith
US 3830321 A
Abstract
An excavating tool and a bit for use therewith in which the bit is of small dimensions and is mounted in a block in which the bit is rotatable and which block is configured in such a manner that it can be welded to various types of holders so that a plurality of blocks and bits mounted on a holder make an excavating tool of selected style and size.
Images(3)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

United States atent [191 McKenry et al.

[ EXCAVATING TOOL AND A BIT FOR USE THEREWITH [75] Inventors: Robert J. McKenry, Windber;

Michael A. College, Everett, both of Pa.

[73] Assignee: Kennametal lnc., Latrobe, Pa.

[22] Filed: Feb. 20, 1973 [21] Appl. No.: 333,869

52 U.S.Cl ..17s/332,175/335,175/354,

.7 2 9 59 [51 Int.Cl. ..E21b9/12,E21b9/18 [58] Field of Search........ 299/86, 92; 175/335, 354, 175/332 [56] References Cited UNITED STATES PATENTS Krekeler 299/92 Aug. 20, 1974 i tgg pll 3/l970 Morrow..... 299/86 3,650,565 3/1972 Kniff 299/86 3,720,273 3/1973 McKenry et al. 175/335 Primary Examiner-Ernest R. Purser Attorney, Agent, or Firm-Melvin A. Crosby [5 7] ABSTRACT An excavating tool and a bit for use therewith in which the bit is of small dimensions and is mounted in a block in which the bit is rotatable and which block is configured in such a manner that it can be welded to various types of holders so that a plurality of blocks and bits mounted on a holder make an excavating tool of selected style and size.

5 Claims, 8 Drawing Figures PAIENEUmczomm SIEEI 10$ 3 EXCAVATING TOOL AND A BIT FOR USE THEREWITH The present invention relates to excavating tools and to bits to be used therewith and is particularly concerned with excavating tools made up from small bits and support blocks therefor with the blocks mounted on a support member.

Excavating tools and bits therefor are known. Further, bits of the pick type in which the bit is symmetrical by a longitudinal axis and has a sharp point on the leading end and is rotatably supported in a block are known. Heretofore, however, the bits and blocks have been relatively large and the size limitations thereby imposed on the excavating tool has precluded the manufacture of excavating tools for boring small diameter holes and for taking cores and the like.

The present invention is particularly concerned with excavating tools utilizing support blocks and pick-type bits rotatable therein in which the bits are relatively small and wherein the blocks are especially configured to facilitate the mounting thereof on a supporting member forming a part of the excavatingtool.

Another object of the invention is the provision of a pick-type bit of the nature referred to so configured as to permit the mounting of a massive wear resistant element in the working end thereof.

These and other objects and advantages of the present invention will become more apparent upon reference to the following detailed specification taken in connection with the accompanying drawings in which:

FIG. I is a side view of an auger or boring tool constructed according to the present invention.

FIG. 2 is an end view of the tool of FIG. 1.

FIG. 3 is an end view of a tool similar to what is shown in FIGS. 1 and 2 but wherein the tool comprises swingable wing cutters at the outside.

FIG. 4 is an end view of a small diameter auger according to the present invention.

FIG. 5 is an end view of a core barrel utilizing bits according to the present invention.

FIG. 6 is a side view partly in section showing one type of bit and block according to the present inventron.

FIG. 7 is an end view looking in from the left side of FIG. 6.

FIG. 8 is a view partly in section showing another type of pick-type bit according to the present invention.

BRIEF SUMMARY OF THE INVENTION According to the present invention, an excavating tool is constructed utilizing a support member which may be in the form of a back plate or ring and one one side of which is mounted, preferably, by welding, a plurality of blocks having bores therein. Pick-type bits are provided having cylindrical shanks rotatably receivable in the bores with the bits having pointed leading ends preferably provided with hard wear resistant inserts formed of, for example, cemented tungsten carbide.

The bits are held in the blocks against any substantial amount of axial movement therein while being permitted to rotate in the blocks. The picks, when presented to a formation to be reduced, are driven against the formation and will rotate in the respective blocks and will,

thus, wear off evenly and remain sharp and pointed throughout the life of the respective pick.

In one form of the invention, each pick has a massive pointed element formed of cemented tungsten carbide, or a like hard wear resistant material, mounted on the tip end thereof and which element has extremely long life and pronounced formation reducing capabilities. The support block for each pick is especially configured to facilitate mounting of the block on the support member in various angularly related positions so that the pick-type bits supported by a group of blocks on a support member can be so arranged that the point ends thereof are distributed relative to the formation to be reduced and are, therefore, efficient in reducing the formation.

Due to the small size of the pick-type bits and the support blocks therefor, small diameter auger tools can be made as well as core barrels, both of which are outside the scope of the conventional larger type pick-type 'bit and support block.

DETAILED DESCRIPTION OF THE INVENTION Referring to the drawings somewhat more in detail, in FIGS. 1 and 2, there is shown an auger consisting of a support plate or backing plate 10 from one side of which extends a drive shank 12 which may, for example, be hexagonal. Drive shank 12- is adapted for engagement by a driver which rotates plate 10 on the axis thereof while pressing the plate 10 in a direction away from the side from which driver 12 projects.

Plate 10 in the center thereof has fixed thereto a spacer or chuck 14 to the outer end of which is attached a pilot bit 16 which may consist of a body of steel with a transversely extending blade 18 fixed therein and which blade may advantageously consist of cemented tungsten carbide or a like hard wear resistant material.

According to the present invention, there is mounted on the plate 10 in circumferentially spaced relation on the same side as the pilot cutter, a plurality of support blocks 20 and in each of which there is rotatably mounted a pick-type bit 22 which at its outer free end is provided with a hard wear resistant insert 24 and which may, for example, consist of cemented tungsten carbide or the like.

Each pick-type bit has a shank 26 extending through an axial bore in the respective block 20 and on that portion of shank 26 which protrudes from the back of the block there is provided an annular groove into which a snap ring 28, either of metal or plastic, is mounted and which snap ring 28 prevents the bit from coming out of the block but does not in any way inhibit the pick from rotation in the block. The ring 28 can also be in the form of a rubber-like O-ring.

As will be seen in FIG. 2, the bits are so distributed as to cover a substantial radial range relative to the axis of the auger so that the formation to which the auger is presented is adequately reduced over the entire diameter of the auger.

It will be appreciated, upon reference to FIG. 2, that there is a bit 22a having its point radially innermost, and a bit 22b having its point disposed radially outwardly from the point of bit 22a and two bits 220 having their points radially outermost and both running on about the same circle and forming gauge cutters. The auger according to FIGS. 1 and 2 might, for example, be arranged to out about a 4 inch diameter hole.

FIG. 3 shows an arrangement for cutting a somewhat larger hole, and in this view a back plate 30 is provided from which a pilot cutter 32 protrudes in the axial direction on one side. On the same side of back plate 30, there is mounted in radially and circumferentially distributed relation a plurality of blocks 34 each having therein a respective pick-type bit 36.

Further, in at least two circumferentially distributed positions, plate 30 carries a U-shaped wing cutter support 37, each of which has mounted thereon a further block 38 with a respective pick 40 therein. The auger shown in FIG. 3 is adapted for rotation in the direction of arrow 42 during a working operation, and this will cause the wing cutters referred to to swing to a radially outermost position and determine the gauge of the bore being formed.

When the auger is rotated in the reverse direction, however, the wing cutters swing inwardly, as shown in dot-dash outline at the bottom of FIG. 3, and this provides ample clearance to permit the auger to be retracted from a bore, or to be introduced into a bore from which it has been withdrawn for the replacement of tools. When the wing cutters in FIG. 3 are swung to their radially outer positions, a firm bearing of the wing cutters on plate 30 occurs in the regions indicated at 44 so that the wing cutters are solidly supported during cutting operations.

FIG. 4 shows an auger for a small hole, for example, about 3 to 3 /2 inches. In FIG. 4, there is a base plate member 50 and mounted thereon in circumferentially distributed relation are blocks 52, each of which rotatably supports a respective picktype bit 54. In FIG. 4, the point ends of the pick-type bits are distributed radially so that each works in a respective radial zone of the bore being formed. Only one bit in the modification of FIG. 4 operates as a gauge cutter as opposed to the two bits which serve as gauge cutters in each of the modifications of FIGS. 2 and 3.

The small size of the picks and blocks enable the bit and block of the present invention to be utilized for forming core barrels. For example, in FIG. 5, a ring 60 is provided and fixed thereto in circumferentially spaced relation are blocks 62 each having a respective pick-type bit 64 mounted therein. The axes of the picktype bits are inclined with respect to the central axis of ring 60 so that the desired radial range is covered. In FIG. 5, the core taken is that region disposed radially inwardly from the two innermost pick-type bits.

FIGS. 6 and 7 show more in detail a typical block and pick-type bit of the nature illustrated in any of the modifications previously described. In FIGS. 6 and 7, the block is indicated at 70 and will be seen to have a central axial bore 72 in which the shank 74 of the respective bit 76 is rotatably mounted. The shank protrudes from the back of the block and has a snap ring 78 mounted in a groove provided in the shank at that region.

As opposed to the larger type blocks employed with pick-type bits, the block 70 in FIGS. 6 and 7 has a flat front face 80 and the pick-type bit 76 has a shoulder 82 that engages face 80 to support the working thrusts imposed on the bit. The shoulder 82 is formed by an enlarged forward end 84 formed at the front end of shank 74 and integral therewith. Enlarged forward end 84 has a bore 86 extending therein from the front end and bore 86 receives the shank 88 of a massive hard wear resistant insert 90 which, as mentioned, may be formed of cemented tungsten carbide or the like. The outwardly protruding end of insert is conically formed and tapers into a point at 92.

The block 70 has a dependent portion 94 which on the rear side at 96 inclines upwardly at an angle of about 45. As will be seen in FIG. 7, the sides of the dependent portion 94 as at 98 are also inclined upwardly and outwardly at angles of about 45. The respective angles can be varied, but the provision of the inclination on the dependent portion 94 of the block is of importance because it facilitates positioning the blocks on the various support members provided therefor and the fixing of the blocks to the support members as by weldmg.

FIG. 8 illustrates a pick-type bit similar to that of FIGS. 6 and 7 except that the bit 100 in FIG. 8 has a forward portion 102 axially longer than the forward portion 84 of the bit of FIGS. 6 and 7. The forward portion 102 of the bit of FIG. 8 has a bore 104 and a cylindrical insert 106 of cemented tungsten carbide or the like is mounted therein. This insert is also pointed on the forward end.

The inserts in all cases are advantageously brazed in position, but if suitable machining and manufacturing tolerances are observed, the inserts can also be mounted in the bores therefor with a press fit. Brazing is preferred because if the bodies of the bits wear away in use and expose the sides of the inserts that are normally embedded in the body, the inserts will be held in place by the brazing material and will not readily be knocked out of the body of the bit.

The bits can be used for drilling vertical holes as well as horizontal holes.

Modifications may be made within the scope of the appended claims.

What is claimed is:

1. In a mining tool; a bit having a bit body with a cylindrical shank adapted to be rotatably received in a bore in a support member, a substantially cylindrical head portion larger in diameter than said shank integrally connected to the forward end of the shank and coaxial therewith, an annular shoulder at the juncture of said shank and head portion and facing toward the shank end of the bit, said head portion being substantially shorter in the axial direction than said shank, said head portion having a minor part of the axial length thereof at the forward end tapering inwardly, a cylindrical recess coaxial with said head portion extending axially into said forward end of the head portion and having an axial length greater than half the axial length of the head portion and a diameter substantially greater than half the diameter of said shank, and a massive insert of hard wear resistant material having a shank portion fixed in said recess and a working portion integral with the shank portion at the forward end thereof and protruding forwardly from the forward end of said head portion of the bit body, said working portion being substantially larger in diameter than said shank portion of the insert and symmetric about the axis of the bit body and tapering inwardly in the forward direction to a pointed end, said insert at the juncture of said shank portion and working portion thereof having an annular flange region facing the forward end of the head portion of the bit body and in abutting engagement therewith, the working portion of said insert being substantially as long in the axial direction as said head portion of the bit body, said shank of said bit body having annular groove means formed therein to receive a keeper element for retaining the bit in assembled relation with a support member.

2. A mining tool according to claim 1 in which each of said shoulder and flange region is disposed in a plane perpendicular to the axis of the bit.

3. A mining tool according to claim 1 in which said working portion has a larger diameter cylindrical first region at the rearward end adjacent the forward end of the head portion of the bit body, a second intermediate region tapering inwardly in the forward direction at a first angle, and a third region at the forward end tapering inwardly in the forward direction at a second angle greater than said first angle, said third region terminating at the forward end in said pointed end.

4. A mining tool according to claim 1 in which said annular shoulder is disposed in a plane perpendicular to the axis of the bit body, and a support member in the form of a block having a bore for receiving the shank of the bit and a front end disposed in a plane perpendicular to the axis of the bore for engagement with said shoulder.

5. A mining tool according to claim 4 which includes a ring rotatable on a central axis, a plurality of said blocks mounted on one axial side of said ring in circumferentially spaced relation and all having the axes of the bores therein inclined in one and the same circumferential direction of said ring, the axes of said bores being inclined at different angles to the axis of rotation of said ring when the ring is viewed in the axial direction to dispose the point ends of the bits in the blocks in distributed relation over a radial range which extends from radially inside the ring to radially outside the ring whereby the bits in said blocks will take a kerf radially wider than said ring-whereby said tool is adapted for taking a core.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3342532 *Mar 15, 1965Sep 19, 1967Cincinnati Mine Machinery CoCutting tool comprising holder freely rotatable in socket with bit frictionally attached
US3498677 *Oct 30, 1968Mar 3, 1970Bowdil CoCutting apparatus
US3650565 *May 4, 1970Mar 21, 1972Kennametal IncPick type mining bit and support block therefor
US3720273 *Mar 3, 1971Mar 13, 1973Kennametal IncMining tool
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4547020 *May 9, 1983Oct 15, 1985Gte Products CorporationRotatable cutting bit
US4561698 *Jun 21, 1984Dec 31, 1985Beebe Donald EWear protector for tooth brackets on roadway surface cutting machines
US4751972 *Apr 15, 1987Jun 21, 1988Smith International, Inc.Revolving cutters for rock bits
US4844550 *May 16, 1988Jul 4, 1989Beebe Donald EWear protector for tooth brackets on roadway surface cutting machines
US4865392 *Jul 16, 1987Sep 12, 1989Gte Products CorporationRotatable cutting bit
US4917196 *Aug 15, 1989Apr 17, 1990Kennametal Inc.Excavating tooth for an earth auger
US4938538 *Mar 6, 1984Jul 3, 1990Santrade LimitedExcavating tool cutting insert
US5067775 *Apr 21, 1988Nov 26, 1991Kennametal Inc.Retainer for rotatable bits
US5143163 *Aug 29, 1991Sep 1, 1992Kennametal Inc.Digging tooth
US5161859 *May 30, 1991Nov 10, 1992Santrade LimitedExcavating tool cutting insert
US5261499 *Jul 15, 1992Nov 16, 1993Kennametal Inc.Two-piece rotatable cutting bit
US5497843 *Mar 24, 1995Mar 12, 1996Central Mine EquipmentHollow auger head assembly
US5720528 *Dec 17, 1996Feb 24, 1998Kennametal Inc.Rotatable cutting tool-holder assembly
US6354771Dec 2, 1999Mar 12, 2002Boart Longyear Gmbh & Co. KgCutting or breaking tool as well as cutting insert for the latter
US6574527Oct 5, 2000Jun 3, 2003Kennametal Inc.Method of selecting a cutting system
US6712431Dec 6, 1999Mar 30, 2004Genesis Mining Technologies (Pty) LimitedCutting arrangement
US7387345May 11, 2007Jun 17, 2008Hall David RLubricating drum
US7390066May 11, 2007Jun 24, 2008Hall David RMethod for providing a degradation drum
US7396086 *Apr 3, 2007Jul 8, 2008Hall David RPress-fit pick
US7401863Apr 3, 2007Jul 22, 2008Hall David RPress-fit pick
US7413258Oct 12, 2007Aug 19, 2008Hall David RHollow pick shank
US7469971Apr 30, 2007Dec 30, 2008Hall David RLubricated pick
US7475948Apr 30, 2007Jan 13, 2009Hall David RPick with a bearing
US7600823Oct 13, 2009Hall David RPick assembly
US7628233Dec 8, 2009Hall David RCarbide bolster
US7635168Jul 22, 2008Dec 22, 2009Hall David RDegradation assembly shield
US7637574Aug 24, 2007Dec 29, 2009Hall David RPick assembly
US7648210Jan 10, 2008Jan 19, 2010Hall David RPick with an interlocked bolster
US7661765Feb 16, 2010Hall David RBraze thickness control
US7669674Mar 2, 2010Hall David RDegradation assembly
US7712693Apr 7, 2008May 11, 2010Hall David RDegradation insert with overhang
US7717365Apr 7, 2008May 18, 2010Hall David RDegradation insert with overhang
US7740414Nov 2, 2007Jun 22, 2010Hall David RMilling apparatus for a paved surface
US7744164Jul 22, 2008Jun 29, 2010Schluimberger Technology CorporationShield of a degradation assembly
US7832808Nov 16, 2010Hall David RTool holder sleeve
US7832809Jul 22, 2008Nov 16, 2010Schlumberger Technology CorporationDegradation assembly shield
US7871133Jan 18, 2011Schlumberger Technology CorporationLocking fixture
US7926883Apr 19, 2011Schlumberger Technology CorporationSpring loaded pick
US7946656May 24, 2011Schlumberger Technology CorporationRetention system
US7946657Jul 8, 2008May 24, 2011Schlumberger Technology CorporationRetention for an insert
US7963617Jun 21, 2011Schlumberger Technology CorporationDegradation assembly
US7976238 *Jul 12, 2011Hall David REnd of a moldboard positioned proximate a milling drum
US7976239Sep 23, 2010Jul 12, 2011Hall David REnd of a moldboard positioned proximate a milling drum
US7992944Aug 9, 2011Schlumberger Technology CorporationManually rotatable tool
US7992945Aug 9, 2011Schlumberger Technology CorporationHollow pick shank
US7997661Jul 3, 2007Aug 16, 2011Schlumberger Technology CorporationTapered bore in a pick
US8007050Aug 30, 2011Schlumberger Technology CorporationDegradation assembly
US8007051Nov 29, 2007Aug 30, 2011Schlumberger Technology CorporationShank assembly
US8028774Nov 25, 2009Oct 4, 2011Schlumberger Technology CorporationThick pointed superhard material
US8029068Oct 4, 2011Schlumberger Technology CorporationLocking fixture for a degradation assembly
US8033615Jun 9, 2008Oct 11, 2011Schlumberger Technology CorporationRetention system
US8033616Oct 11, 2011Schlumberger Technology CorporationBraze thickness control
US8038223Oct 18, 2011Schlumberger Technology CorporationPick with carbide cap
US8061457Feb 17, 2009Nov 22, 2011Schlumberger Technology CorporationChamfered pointed enhanced diamond insert
US8061784Jun 9, 2008Nov 22, 2011Schlumberger Technology CorporationRetention system
US8109349Feb 7, 2012Schlumberger Technology CorporationThick pointed superhard material
US8118371Jun 25, 2009Feb 21, 2012Schlumberger Technology CorporationResilient pick shank
US8123302Jan 28, 2008Feb 28, 2012Schlumberger Technology CorporationImpact tool
US8136887 *Oct 12, 2007Mar 20, 2012Schlumberger Technology CorporationNon-rotating pick with a pressed in carbide segment
US8201892Dec 10, 2007Jun 19, 2012Hall David RHolder assembly
US8215420Jul 10, 2012Schlumberger Technology CorporationThermally stable pointed diamond with increased impact resistance
US8240404 *Aug 14, 2012Hall David RRoof bolt bit
US8250786Aug 5, 2010Aug 28, 2012Hall David RMeasuring mechanism in a bore hole of a pointed cutting element
US8261471Jun 30, 2010Sep 11, 2012Hall David RContinuously adjusting resultant force in an excavating assembly
US8262168Sep 11, 2012Hall David RMultiple milling drums secured to the underside of a single milling machine
US8292372Oct 23, 2012Hall David RRetention for holder shank
US8322796Dec 4, 2012Schlumberger Technology CorporationSeal with contact element for pick shield
US8342611Dec 8, 2010Jan 1, 2013Schlumberger Technology CorporationSpring loaded pick
US8365845Oct 5, 2011Feb 5, 2013Hall David RHigh impact resistant tool
US8403595Mar 26, 2013David R. HallPlurality of liquid jet nozzles and a blower mechanism that are directed into a milling chamber
US8414085Apr 9, 2013Schlumberger Technology CorporationShank assembly with a tensioned element
US8434573Aug 6, 2009May 7, 2013Schlumberger Technology CorporationDegradation assembly
US8449039Aug 16, 2010May 28, 2013David R. HallPick assembly with integrated piston
US8449040Oct 30, 2007May 28, 2013David R. HallShank for an attack tool
US8453497Nov 9, 2009Jun 4, 2013Schlumberger Technology CorporationTest fixture that positions a cutting element at a positive rake angle
US8454096 *Jun 26, 2008Jun 4, 2013Schlumberger Technology CorporationHigh-impact resistant tool
US8485609Jan 28, 2008Jul 16, 2013Schlumberger Technology CorporationImpact tool
US8485756Dec 23, 2010Jul 16, 2013David R. HallHeated liquid nozzles incorporated into a moldboard
US8500209Apr 23, 2009Aug 6, 2013Schlumberger Technology CorporationManually rotatable tool
US8500210Jun 25, 2009Aug 6, 2013Schlumberger Technology CorporationResilient pick shank
US8534767Jul 13, 2011Sep 17, 2013David R. HallManually rotatable tool
US8540037Apr 30, 2008Sep 24, 2013Schlumberger Technology CorporationLayered polycrystalline diamond
US8567532Nov 16, 2009Oct 29, 2013Schlumberger Technology CorporationCutting element attached to downhole fixed bladed bit at a positive rake angle
US8590644Sep 26, 2007Nov 26, 2013Schlumberger Technology CorporationDownhole drill bit
US8622155Jul 27, 2007Jan 7, 2014Schlumberger Technology CorporationPointed diamond working ends on a shear bit
US8646848Jun 28, 2011Feb 11, 2014David R. HallResilient connection between a pick shank and block
US8668275Jul 6, 2011Mar 11, 2014David R. HallPick assembly with a contiguous spinal region
US8701799Apr 29, 2009Apr 22, 2014Schlumberger Technology CorporationDrill bit cutter pocket restitution
US8714285Nov 16, 2009May 6, 2014Schlumberger Technology CorporationMethod for drilling with a fixed bladed bit
US8728382Mar 29, 2011May 20, 2014David R. HallForming a polycrystalline ceramic in multiple sintering phases
US8752753 *Dec 22, 2009Jun 17, 2014Mark RussellWear piece element and method of construction
US8931854Sep 6, 2013Jan 13, 2015Schlumberger Technology CorporationLayered polycrystalline diamond
US8960337Jun 30, 2010Feb 24, 2015Schlumberger Technology CorporationHigh impact resistant tool with an apex width between a first and second transitions
US8998346 *Jun 17, 2013Apr 7, 2015David R. HallAttack tool with an interruption
US9028009Jan 18, 2011May 12, 2015Element Six GmbhPick tool and method for making same
US9033425May 28, 2013May 19, 2015Element Six GmbhPick tool and method for making same
US9051794Apr 12, 2007Jun 9, 2015Schlumberger Technology CorporationHigh impact shearing element
US9051795Nov 25, 2013Jun 9, 2015Schlumberger Technology CorporationDownhole drill bit
US9068410Jun 26, 2009Jun 30, 2015Schlumberger Technology CorporationDense diamond body
US9222353Jan 8, 2009Dec 29, 2015Esco CorporationTip for an earth working roll
US9334731 *Jan 11, 2013May 10, 2016Element Six Abrasives S.A.Pick tool and assembly comprising same
US9366089Oct 28, 2013Jun 14, 2016Schlumberger Technology CorporationCutting element attached to downhole fixed bladed bit at a positive rake angle
US20080035381 *May 11, 2007Feb 14, 2008Hall David RLubricating drum
US20080035383 *Oct 12, 2007Feb 14, 2008Hall David RNon-rotating Pick with a Pressed in Carbide Segment
US20080035386 *Aug 24, 2007Feb 14, 2008Hall David RPick Assembly
US20080036269 *Oct 12, 2007Feb 14, 2008Hall David RHollow Pick Shank
US20080036281 *Oct 12, 2007Feb 14, 2008Hall David RHollow Pick Shank
US20080067859 *Nov 29, 2007Mar 20, 2008Hall David RShank Assembly
US20080088172 *Dec 10, 2007Apr 17, 2008Hall David RHolder Assembly
US20080115977 *Jan 28, 2008May 22, 2008Hall David RImpact Tool
US20080129104 *Jan 28, 2008Jun 5, 2008Hall David RImpact Tool
US20080197691 *Apr 30, 2008Aug 21, 2008Hall David RLocking fixture for a degradation assembly
US20080211290 *Jul 3, 2007Sep 4, 2008Hall David RTapered Bore in a Pick
US20080246329 *Jun 9, 2008Oct 9, 2008Hall David RRetention System
US20080250724 *Apr 12, 2007Oct 16, 2008Hall David RHigh Impact Shearing Element
US20080264697 *Jul 8, 2008Oct 30, 2008Hall David RRetention for an Insert
US20080284234 *May 14, 2007Nov 20, 2008Hall David RPick with a Reentrant
US20080284235 *May 15, 2007Nov 20, 2008Hall David RSpring Loaded Pick
US20080309146 *Jul 22, 2008Dec 18, 2008Hall David RDegradation assembly shield
US20080309147 *Jul 22, 2008Dec 18, 2008Hall David RShield of a Degradation Assembly
US20080309149 *Aug 28, 2008Dec 18, 2008Hall David RBraze Thickness Control
US20090000828 *Sep 10, 2008Jan 1, 2009Hall David RRoof Bolt Bit
US20090066149 *Sep 7, 2007Mar 12, 2009Hall David RPick with Carbide Cap
US20090146489 *Jun 9, 2008Jun 11, 2009Hall David RRetention System
US20090174252 *Jan 8, 2009Jul 9, 2009Esco CorporationTip for an earth working roll
US20090200855 *Apr 23, 2009Aug 13, 2009Hall David RManually Rotatable Tool
US20090200857 *Apr 23, 2009Aug 13, 2009Hall David RManually Rotatable Tool
US20100054875 *Nov 9, 2009Mar 4, 2010Hall David RTest Fixture that Positions a Cutting Element at a Positive Rake Angle
US20100071964 *Nov 30, 2009Mar 25, 2010Hall David RThick Pointed Superhard Material
US20100237135 *Sep 23, 2010Schlumberger Technology CorporationMethods For Making An Attack Tool
US20100242375 *Sep 30, 2010Hall David RDouble Sintered Thermally Stable Polycrystalline Diamond Cutting Elements
US20100263939 *Oct 21, 2010Hall David RHigh Impact Resistant Tool with an Apex Width between a First and Second Transitions
US20100264721 *Apr 16, 2009Oct 21, 2010Hall David RSeal with Rigid Element for Degradation Assembly
US20100275425 *Apr 29, 2009Nov 4, 2010Hall David RDrill Bit Cutter Pocket Restitution
US20100326740 *Jun 26, 2009Dec 30, 2010Hall David RBonded Assembly Having Low Residual Stress
US20110013984 *Sep 23, 2010Jan 20, 2011Hall David REnd of a Moldboard Positioned Proximate a Milling Drum
US20110175430 *Jul 21, 2011Ernst HeiderichPick tool and method for making same
US20120121846 *Dec 22, 2009May 17, 2012Cutting & Wear Resistant Developments LimitedWear Piece Element and Method of Construction
US20130341999 *Jun 22, 2007Dec 26, 2013David R. HallAttack Tool with an Interruption
US20140368023 *Jun 17, 2013Dec 18, 2014David R. HallAttack Tool with an Interruption
US20150035342 *Jan 11, 2013Feb 5, 2015Element Six Abrasives S.A.Pick tool and assembly comprising same
US20150060149 *Sep 4, 2013Mar 5, 2015Shear Bits, Ltd.Drill bit having shear and pick-type cutters
USRE38151Aug 20, 2001Jun 24, 2003Kennametal Inc.Rotatable cutting bit
EP0237359A2 *Mar 13, 1987Sep 16, 1987Smith International, Inc.Rotary drag bits
EP0864723A1 *Jul 7, 1997Sep 16, 1998Tone Geo Tech Co. Ltd.Boring bit and boring casing
WO1991002882A1 *Mar 9, 1990Mar 7, 1991Kennametal Inc.An excavating tooth for an earth auger
WO2000034626A1 *Dec 6, 1999Jun 15, 2000Genesis Mining Technologies LimitedCutting arrangement
Classifications
U.S. Classification175/332, 175/335, 175/354, 299/111
International ClassificationE21C25/04, E21C35/183, E21B10/62, E21B10/00, E21B10/26, E21C35/18, E21C25/00, E21B10/02, E21C35/00
Cooperative ClassificationE21B10/26, E21C25/04, E21B10/62, E21B10/02, E21C2035/1816, E21C35/183
European ClassificationE21B10/26, E21C25/04, E21C35/183, E21B10/62, E21B10/02