US3147572A - Apparatus for resharpening drill bits - Google Patents

Apparatus for resharpening drill bits Download PDF

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US3147572A
US3147572A US241816A US24181662A US3147572A US 3147572 A US3147572 A US 3147572A US 241816 A US241816 A US 241816A US 24181662 A US24181662 A US 24181662A US 3147572 A US3147572 A US 3147572A
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bit
nozzle
housing
axis
shaft
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US241816A
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Walter F Kempe
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Norton Christensen Inc
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Christensen Diamond Products Co
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/02—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for sharpening or cleaning cutting tools, e.g. files

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  • the present invention relates to apparatus for sharpening bits, and more particularly to apparatus for sharpening bits having diamond cutting elements.
  • Diamond drill bits used in mining, oil well drilling, coring, concrete cutting, and similar operations become dull as'a result of loss of diamond elements from the exposed faces of the matrices in which they are embedded.
  • Diamond drill bits of the impregnated type have diamond cutting elements dispersed throughout the supporting matrix.
  • a dull bit may be resharpened by removing some of the matrix material from the bit crown to expose additional diamonds. Such resharpening can be repeated whenever necessary so long as sufficient diamond elements are still present in the remaining matrix.
  • An object of the present invention is to provide an apparatus for sharpening diamond drill bits, and the like, by blasting abrasive particles against their cutting faces in such manner as to expose primarily the leading portions of the diamond cutting elements of the bit, without subs'tantially exposing their trailing portions, thereby effectively supporting the rear or trailing portions of the diamond elements by matrix material, and enhancing their useful life.
  • Another object of the invention is to provide apparatus for sharpening a diamond drill bit, and the like, in which abrasive material is blasted against the bit in such manner as to rotate the bit in order that its entire circumference is subject to the abrasive stream.
  • a further object of the invention is to provide an apparatus for sharpening diamond drill bits, and the like, by blasting abrasive material against their cutting faces, the apparatus being readily adjusted to support drill bits of different sizes in appropriatedilferent positions, so. that the abrasive stream can act upon their working faces and expose the cutting elements embedded therein.
  • An additional object of the invention is to provide an apparatus for sharpening diamond drill bits, and the like, in which a stream of abrasive material is blasted against the bit to rotate it and also efiect its sharpening, and in which rotation of the bit may be retarded to prevent its overspeeding by the abrasive stream. If desired, rotation of the bit by the abrasive stream may be assisted in lieu of being retarded, as, for example, when the abrasive stream is rotating the bit at too slow a speed.
  • Yetanother object of the invention is to provide an apparatus for sharpening a diamond drill bit, and the like, by discharging a fluid stream from a nozzle or orifice through a mass of abrasive material to drive the latter against the bit, in which plugging of the nozzle or orifice by the abrasive material is prevented.
  • Still a further object of the invention is to provide an apparatus for blasting or jetting abrasive particles upon the drill bit, which can accommodate drill bits of various sizes, and which is comparatively simple, economical to manufacture, and of strong and sturdy construction.
  • FIGURE 1 is a Vertical section through an apparatus embodying the invention
  • FIG. 2 is a top plan view of the apparatus shown in FIG. 1;
  • FIG. 3 is a section taken along the line 3-3 on FIG. 2;
  • FIG. 4 is a cross-section taken along the line 4-4 on FIG. 1;
  • FIG. 5 is an enlarged fragmentary section taken along the line 55 on FIG. 1;
  • FIG. 6 is an enlarged vertical section taken along the line 66 on FIG. 1;
  • FIG. 7 is a cross-section taken along the line 7-7 on FIG. 6.
  • the apparatus illustrated in the drawings is adapted to sharpen a drill bit A, such as a diamond drill bit, disclosed in FIG. 1 as being mounted in the apparatus.
  • the bit illustrated is designed to cut a core, and includes a generally annular body 10 having an upper threaded pin 11 for connection to a tubular drill string (not shown), which is used in rotating the core bit.
  • the lower portion 12 of the bit body may comprise a suitable matrix throughout which diamond particles or stones 13 are dispersed, the diamonds projecting from the bit crown, as from its lower face 14, inner face 15, and outer reaming face 16.
  • the diamonds or corresponding cutting elements 13 embedded in the matrix normally project from the matrix to some extent for operation upon the material in which the cutting action is being performed.
  • the diamond elements may break off or otherwise become lost during the drilling operation, which severely reduces the drilling effectiveness of the drill bit.
  • a portion of the matrix material may be eroded away by blasting abrasive particles against the cutting faces 14, 15, 16 of the bit, resulting in exposure of additional diamond elements in the matrix, whereupon the bit A can again be used for the purpose of drilling the hole in the particular material to which it is applied.
  • the resharpening of a drill bit can take place repeatedly, so long as there are sufiicient diamond elements 13 embedded in its matrix.
  • the apparatus includes an outer casing or housing 17 supported above a suitable surface S, such as the ground or floor, by supporting legs 18, the upper ends of which are received within housing sockets 19.
  • the drill bit A can be appropriately supported within an adapter 20 capable of accommodating bits having threaded pins 11, as illustrated, or threaded boxes (not shown).
  • One side of the adapter 20 has a rubber or rubber-like ring 21 secured therewithin into which the threaded pin 11 of the bit can be forced.
  • the opposite side of the adapter has a rubber or rubber-like ring 22 mounted on its periphery so that a threaded box of a drill bit (not shown) may be forced thereon.
  • the adapter 20 is mounted upon a vertical, rotatable shaft 23, either in the position illustrated in FIG. 1, when a bit with a threaded pin 11 is to be resharpened, or such adapter is inverted from the position shown and is mounted on the shaft with the external rubber ring 22 facing in a downward direction.
  • the hub 24 of the adapter may have teeth 25 thereon adapted to be embedded in the periphery of the rotatable shaft 23, the adapter being releasably attached to the shaft by a screw 26, or the like, extending radially of the adapter and bearing against the shaft.
  • the adapter 20 may be suitably placed on the shaft 23, preferably with the lower face 14 of the bit crown in substantially the same horizontal plane as the lower end of the shaft.
  • the adapter 20 has circumferentially spaced longitudinal holes 27 therein for the passage of fluent material, and it may also Patented Sept. 8, 1964 have circumferentially spaced longitudinal passages 28 in its inner hub portion to permit passage of fluent material therethrough.
  • the shaft 23 is disposed vertically in the casing or housing 17, being supported from a lid or supporting cover 30 of the housing by suitable thrust bearings.
  • a nut 31 is threaded on the upper end of the shaft 23 externally of the cover, the nut bearing against the outer race 32 of a ball thrust bearing 33, its lower race 34 engaging a spacer sleeve 35 which contacts the inner race 36 of a lower ball thrust bearing 37, the lower race 38 of which rests upon an inwardly directed cover flange 39 surrounding an opening 40 through the cover 36 receiving the shaft 23 and bearing structure 32. to 38.
  • a jetting or nozzle blasting device 42 includes a housing extension 43 which depends below the sump or hopper portion 44 of the housing 17, the latter being adapted to contain a suitable abrasive material, such as a grinding compound, si.icon carbide, or aluminum oxide, which, for example, may be of 36 to 60 mesh.
  • the nozzle structure 42 is adapted to blast a fluid stream, such as a stream of water, upwardly through the mass of abrasive material to drive the latter against the exposed faces 14, 15, 16 of the bit, thevertical central portion of the crown of which preferably is aligned with the plane in which the fluid stream discharges from the nozzle structure.
  • the nozzle structure 42 includes the housing extension, previously referred to, to which a fluid or water inlet pipe 45 is connected, the water flowing through a housing inlet 46 into a chamber 47 in the housing extension.
  • the lower end of the chamber is closed by a pliant, elastic diaphragm 48 clamped against the lower end of the housing extension by a lower cover 49 secured to the housing flange 58 by bolts 51.
  • Assurance is had against leakage of fluid from the chamber 47 by providing a suitable sealing gasket 52, such as a rubber or rubberlike O-ring, in a groove 53 in the cover which engages the underside of the flexible diaphragm 48.
  • diaphragm surrounds the lower stem 54 of a vertically disposed valve member or head 55.
  • the lower end of the stem 54 is constituted as a flange 56 engaging a spring seat 57 surrounding the stem to hold the seat against the central portion of the diaphragm 48 and press such central portion against the lower end of the valve head 55.
  • a helical compression spring 58 is disposed in a socket 59 in the lower cover as, bearing against the base of the socket and against the spring seat 57 so as to urge the head 55 in an upward direction and across the inlet end 66 of an inclined orifice 61 formed in a nozzle 62 made of suitable material. Upward movement of the nozzle 62 is limited by engagement of its external flange 63 with a gasket or seal 64 surrounding the nozzle structure, the seal being forced against the opposed horizontal face 65 of the housing extension.
  • the upper end 66 of the valve member or head is piloted within a nozzle socket 67, the inclined orifice 61 extending through the upper or base portion 68 of the socket, the periphery of the valve member or head being in spaced relation to the inner wall of the socket to form an annular passage 69 through which fluid can pass.
  • a suitable seal ring 78 such as a rubber or rubber-like O-ring, is disposed in a circumferential a ute angle groove 71 formed in the upper edge portion of the valve member.
  • Such seal ring 70 will engage the base 68 of the nozzle when the valve head 55 is urged upwardly thereagainst by the spring 58, to insure The flexible against leakage of fluid around the head 55 and through the inclined orifice 61, or to insure against reverse flow of fluid downwardly through the orifice 61 and around the head 55.
  • fluid entering the housing chamber 47 passes through a cylindrical screen or filter member 72, the lower end of which bears against the diaphragm 48 and the upper end of which bears against the nozzle flange 63, in order to hold the nozzle 62 in its upward position and compress the gasket seal 64 between the flange 63 and the housing 17.
  • the supporting cover 30 of the housing has a downwardly facing generally V-shaped circumferential groove 73 therein adapted to receive a companion-shaped housing rim 74.
  • the axis 75 of rotation of the shaft 23 is eccentric to the center line 76 of the housing 17 and its cover 30 so that turning of the cover 30 on the housing will shift the shaft axis relative to the nozzle orifice 61 to obtain proper positioning of the crown portions of diamond drill bits mounted in the adapter with respect to the orifice.
  • the nozzle stream will be directed midway of the radial face 14 of the bit crown, diverging outwardly and inwardly of the bit thereof so that the abrasive particles blasted upwardly by the fluid stream emanating from the nozzle orifice will cover all faces 14, 15, 16 of the bit crown and effect their sharpening by exposing additional diamond elements.
  • Appropriate indicia 77, 78 are provided for facilitating adjustment of the supporting cover 30 on the housing 18.
  • a fluid outlet boss 79 extending from the upper portion of the housing adjacent to the cover may have a suitable indicating arrow 78 thereon and the upper outer margin of the cover 30 may have suitable indicia 77 thereon corresponding to bit sizes.
  • the bit crown is placed in the appropriate central position relative to the blasting orifice or nozzle 61.
  • the supporting cover 30 may then be clamped in this position of adjustment.
  • the cover 30 is releasably clamped to the housing 17 by diametrically opposed clamp members 80, each clamp member having a horizontal arm 81 engaging the upper outer surface of the cover, this arm merging into a loop 82, which, in turn, merges into a shank or leg portion 83 extending through a hole 84 in a boss 86 integral with or secured to the housing 17, and extending outwardly thereof.
  • a helical compression spring 87 encompasses the shank 83 with its upper end bearing against the underside of the boss 85 and its lower end engaging a washer 88 bearing against a nut 89 threaded on the lower portion of the shank or leg.
  • the arm 81 By grasping a loop 82 and exerting an upward force against the action of the spring 87, the arm 81 can be removed from the cover, after which the clamp member is turned and released, the arm then being disposed to one side of the cover.
  • the clamp members may be pulled upwardly and turned to dispose their arms 81 over the cover, whereupon the clamp members are released to allow the springs 87 to shift and hold the arms downwardly against the cover 30 and clamp it to the housing 17.
  • the orifice 61 is disposed in a vertical plane and is inclined substantially, as, for example, at an angle of about 45 degrees to the horizontal, so that the fluid stream issuing therefrom will pick up and blast the abrasive sharpening material in the sump 44 at an angle against the bit crown.
  • the orifice 61 functions as a turbine nozzle to rotate the bit A in a lefthand direction. Accordingly, the fluid, such as water,
  • a hydraulic device mounted at the upper portion of the apparatus.
  • an impeller or brake wheel 90 is mounted on the upper portion of the shaft 23, being secured thereto by a suitable screw 91 extending through the hub 92 and bearing against the shaft.
  • the peripheral portion of the impeller has blades or teeth 93 against which a horizontal fluid stream from a nozzle or orifice 94 can be directed.
  • Fluid such as water, can enter the nozzle through a fluid inlet pipe 95, the nozzle being carried by the cover 30.
  • an upper flange 96 of the nozzle engages the upper side of the cover 30.
  • the nozzle can be clamped in diflerent positions of adjustment by a clamp nut 97 threaded on the nozzle and adapted to bear against the underside of the cover 30.
  • the clamp nut 97 By loosening the clamp nut 97, the nozzle can be turned in the cover to a position in which its horizontal orifice 94 can direct the jet of water against the teeth 93 to tend to rotate the rotor 90 in a counterclockwise direction, which is the same direction as the shaft 23 and bit are being turned by the jet stream issuing from the blasting nozzle or orifice 61. When in that position, rotation of the diamond drill bit A will be assisted.
  • driving or braking position of the nozzle can be indicated by a suitable pointer 98 formed on the nozzle which coacts with suitable indicia 99 on the cover adjacent thereto (FIG. 2
  • the jet stream issuing from the blasting nozzle 61 tends to rotate the bit at too high a speed, in which event the upper nozzle 94 will be adjusted to occupy a position to direct a stream in a countering direction against the rotor blades or teeth 93, thereby functioning of the hydraulic brake.
  • the stream emanating from the blasting nozzle 61 may be incapable of turning it at a sufiicient speed, in which event the upper nozzle 94 will be adjusted to direct its stream against the turbine wheel or rotor 90 and assist the rotation of the bit in a counterclockwise direction.
  • the bit A is mounted in an adapter 20 of a suitable size, which is then slipped over the shaft 23 and placed in appropriate position thereon, the screw 26 being tightened to firmly attach the adapter to the shaft.
  • a baffle structure Surrounding the shaft 23, bit A, and adapter 20 is a baffle structure, including a cylindrical inner enclosure 100, its lower end resting upon a lower shoulder 101 at the upper end of the sump or hopper portion 44 of the housing 17.
  • This inner enclosure has its upper end 102 terminating below the turbine wheel 90 and has a plurality of longitudinally spaced annular deflectors 103 welded or otherwise secured thereto which serve to minimize the tendency of the abrasive material to rise in the housing with the fluid or water stream.
  • An outer cylindrical enclosure 107 surrounds the inner enclosure 100 in spaced relation thereto, its lower end resting upon supporting lugs 108 projecting inwardly from the wall of the outer casing or housing 17.
  • Abrasive particles that may still remain in the liquid when it passes over the uppermost transverse baffle member 103 can drop downwardly into the annular space 109 between the inner and outer enclosures 100, 107.
  • Liquid passing around the upper end 110 of the outer enclosure, which extends upwardly above the upper baflie member 103, can still drop abrasive particles down into the annular space 111 between the outer enclosure 107 and the inner wall of the housing 17.
  • the lower part of the housing 17 between the inner enclosure 100 and the housing wall contains a substantial amount of abrasive material, such material can readily be shifted back into the sump or hopper portion 44 of the housing by elevating the enclosures 100, 107 from the shoulder 101 and supporting lugs 108.
  • the bit A In sharpening the bit A, it is mounted in the adapter 20 and the latter mounted on the shaft 23 in the manner described above.
  • the upper nozzle 94 is adjusted to its braking or drive position, depending upon the size of the bit mounted in the adapter.
  • the cover 30, with the nozzle 94, turbine wheel 90, shaft 23, adapter 20, and bit A carried thereby is then disposed above the housing and the bit, adapter and shaft inserted down through the bafiies 103 until the cover engages the rim 74.
  • the cover 30 is then turned to align the bit size identification 77 with the boss indicator 78, whereupon the clamp loops 82 are pulled upwardly and turned to place their arms 81 against the cover to hold the latter against the housing rim (FIG. 5).
  • Fluid such as water
  • a suitable source and at a proper pressure is then allowed to enter the fluid inlet pipes 45, 95.
  • the fluid under pressure flows into the chamber 47 and passes through the screen 72, acting upon the diaphragm 48 and urging its central portion downwardly to shift the valve head 55 from its engaging seat provided by the base 68 of the blasting nozzle 62, the water then passing around the upper peripheral portion of the valve head 55 and into the inclined orifice 61.
  • the water emanates at high velocity from the nozzle orifice 61, blasting through the abrasive particles in the hopper portion 44 and driving them in an inclined direction against the crown of the bit A, rotating the bit in a counterclockwise direction and causing the stream of jetted particles to cover the entire circumference and all surfaces 14, 15, 16 of the bit crown.
  • the water or other liquid issuing from its orifice 98 will act upon the rotor 90 and either assist or retard the action of the lower nozzle stream in rotating the bit, resulting in turning of the bit at the desired speed.
  • the nozzle 61 jets the abrasive particles against the bit matrix in advance of each diamond element 13, and will erode away the matrix material in advance of the diamond element as regards clockwise turning of the bit when drilling a hole. A much lesser erosion will occur at the trailing sides of the diamond elements 13, matrix material remaining to support such trailing side and thereby minimizing breakage, or other fracture, and loss of diamond elements from the bit.
  • the inclination of the orifice 61 not only effects the sharpening of the bit by exposing the leading portions of the diamond elements 13, but also provides the motivating fluid for rotating the bit about the shaft axis 75.
  • the stream issuing from the nozzle 61 will blast the abrasive particles over the entire face or crown of the bit, and effectively sharpen the latter by exposing the diamond cutting elements 13.
  • the supply of Water or other liquid to the nozzles 62, 94 is shut off.
  • the spring 58 will shift the head 55 upwardly against its companion seat or nozzle base 68 to close the orifice 61.
  • Such closing of the orifice 61 prevents liquid from flowing back through it and prevents abrasive particles from being carried back into the orifice and possibly plug it or restrict subsequent flow of liquid therethrough.
  • the orifice 61 is automatically closed when liquid is not passing through it and is automatically opened when liquid under pressure is again allowed to flow through the inlet pipe 45 into the housing chamber 47.
  • abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis; means adapted to contain a quantity of abrasive material; said mounting means supporting the drill bit adjacent to the quantity of abrasive material in said containing means; nozzle means having an axis inclined to the face of said bit and positioned to direct a fluid into and through the abrasive material to blast said material in said containing means directly against the drill bit; the direction of discharge from said nozzle means being substantially inclined to the face of said bit, whereby the fluid and abrasive material striking the bit rotate the bit about said axis of rotation.
  • abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis; means adapted to contain a quantity of abrasive material; said mounting means supporting the drill bit adjacent to the quantity of abrasive material in said containing means; nozzle means having an axis inclined to the face of said list and positioned to direct a fluid into and through the abrasive material to blast said material in said containing means directly against the drill bit; the direction of discharge from said nozzle means being inclined substantially to the face of said bit in such direction that the fluid and abrasive material striking the bit rotate the bit counterclockwise about said axis of rotation.
  • abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis; means adapted to contain a quantity of abrasive material; said mounting means supporting the drill bit adjacent to the quantity of abrasive material in said containing means; nozzle means having an axis inclined to the face of said bit and positioned to direct a fluid into and through the abrasive material to blast said material in said containing means directly against the drill bit; the direction of discharge from said nozzle means being inclined substantially to the face of said bit, whereby the fluid and abrasive material striking the bit rotate the bit about said axis of rotation; and means for varying the position of said mounting means to shift said rotational axis with respect to said nozzle means and the direction of discharge of fluid therefrom.
  • means comprising a nozzle for blasting abrasive material against the drilling face of the drill bit; said nozzle having an axis inclined to the face of the bit, the direction of discharge from said nozzle being inclined substantially to the drilling face of the bit, whereby the abrasive material striking the drilling face rotates the bit about said axis of rotation.
  • abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis; means comprising a nozzle for blasting abrasive material against the drilling face of the drill bit; said nozzle having an axis inclined to the face of the bit; the direction of discharge frorn said nozzle being inclined substantially to the drilling face of the bit in such direction that the abrasive material striking the drilling face rotates the bit counterclockwise about said axis of rotation.
  • abrasive blasting apparatus for drill bits: means for mounting the drill bit forrotation about an axis; means comprising a nozzle for blasting abrasive material against the drilling face of the drill bit; said nozzle having an axis inclined to the face of the bit; the direction of discharge from said nozzle being inclined substantially to the drilling face of the bit, whereby the abrasive material striking the drilling face rotates the bit about said axis of rotation; and means for varying the position of said supporting means to shift said rotational axis with respect to said nozzle and the direction of discharge therefrom.
  • abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis; means adapted to contain a quantity of abrasive material; said mounting means supporting the drill bit adjacent to the quantity of abrasive material in said containing means; nozzle means having an axis inclined to the face of said bit and positioned to direct a fluid into and through the abrasive material to blast said material in said containing means directly against the drill bit; the direction of discharge from said nozzle means being inclined substantially to the face of said bit, whereby the fluid and abrasive material striking the bit rotate the bit about said axis of rotation; and brake means operatively connected to said mounting means for retarding rotation of the bit by the fluid and abrasive material striking thereagainst.
  • abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis; means adapted to contain a quantity of abrasive material; said mounting means supporting the drill bit adjacent to the quantity of abrasive material in said containing means; nozzle means having an axis inclined to the face of said bit and positioned to direct a fluid into and through the abrasive material to blast said material in said containing means directly against the drill bit; the direction of discharge from said nozzle means being inclined substantially to the face of said bit, whereby the fluid and abrasive material striking the bit rotate the bit about said axis of rotation; and means operatively connected to said mounting means and selectively shiftable to retard rotation of the bit by the fluid and abrasive material striking thereagainst or to assist such rotation of the bit.
  • abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis; means comprising a nozzle for blasting abrasive material against the drilling face of the drill bit; said nozzle having an axis inclined to the face of the bit; the direction of discharge from said nozzle being inclined substantially to the drilling face of the bit, whereby the abrasive material striking the drilling face rotates the bit about said axis of rotation; and brake means operatively connected to said mounting means for retarding rotation of the bit by the material striking thereagainst.
  • abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis; means comprising a nozzle for blasting abrasive material against the drilling face of the drill bit; said nozzle having an axis inclined to the face of the bit; the direction of discharge from said nozzle being inclined substantially to the drilling face of the bit, whereby theabrasive material striking the drilling face rotates the bit about said axis of rotation; and means operatively connected to said mounting means and selectively shiftable to retard rotation of the bit by the material striking thereagainst or to assist such rotation of the bit.
  • a housing adapted to contain a quantity of abrasive material; a cover closing the upper portion of said housing and turnable on said housing about its axis; a shaft rotatably carried by said cover eccentrically of and substantially parallel to the housing axis; means secured to said shaft for supporting a drill bit in said housing; nozzle means mounted in said housing and positioned to direct a fluid into and through the abrasive material to blast said material in said housing directly against the drill bit; said cover being turnable on said housing and about its axis to adjust the position of said shaft and drill bit carried thereby laterally with respect to said nozzle means and the direction of fluid discharged therefrom.
  • a housing adapted to contain a quantity of abrasive material; a cover closing the upper portion of said housing and turnable on said housing about its axis; a shaft rotatably carried by said cover eccentrically of and substantially parallel to the housing axis; means secured to said shaft for supporting a drill bit in said housing; nozzle means mounted in said housing and positioned to direct a fluid into and through the abrasive material to blast said material in said housing directly against the drill bit; said cover being turnable on said housing and about its axis to adjust the position of said shaft and drill bit carried thereby laterally with respect to said nozzle means and the direction of fluid discharged therefrom; said nozzle means having an axis inclined to the face of the bit, the direction of discharge from said nozzle means being inclined substantially to the face of the bit, whereby the fiuid and abrasive material striking the bit rotate the bit and its supporting means and shaft.
  • a housing adapted to contain a quantity of abrasive material; a cover closing the upper portion of said housing and turnable on said housing about its axis; a shaft rotatably carried by said cover eccentrically of and substantially parallel to the housing axis; means secured to said shaft for supporting a drill bit in said housing; nozzle means mounted in said housing and positioned to direct a fluid into and through the abrasive material to blast said material in said housing directly against the drill bit; said cover being turnable on said housing and about its axis to adjust the position of said shaft and drill bit carried thereby laterally with respect to said nozzle means and the direction of fluid discharged therefrom; said nozzle means having an axis inclined to the face of the bit, the direction of discharge from said nozzle means being inclined substantially to the face of the bit in such direction that the fluid and abrasive material striking the bit rotate the bit and its supporting means and shaft counterclockwise about the axis of said shaft.
  • a housing adapted to contain a quantity of abrasive material; a cover closing the upper portion of said housing and turnable on said housing about its axis; a shaft rotatably carried by said cover eccentrically of and substantially parallel to the housing axis; means secured to said shaft for supporting a drill bit in said housing; nozzle means mounted in said housing and positioned to direct a fluid into and through the abrasive material to blast said material in said housing directly against the drill bit; said cover being turnable on said housing and about its axis to adjust the position of said shaft and drill bit carried thereby laterally with respect to said nozzle means and the direction of fluid discharged therefrom; said nozzle means having an axis inclined to the face of the bit, the direction of discharge from said nozzle means being inclined sub- 10 stantially to the face of the bit,whereby the fluid and abrasive material striking the bit rotate the bit and its supporting means and shaft; and brake means operatively connected to said shaft for
  • abrasive blasting apparatus for drill hits: a housing adapted to contain a quantity of abrasive material; a cover closing the upper portion of said housing and turnable on said housing about its axis; a shaft rotatably carried by said cover eccentrically of and substantially parallel to the housing axis; means secured to said shaft for supporting a drill bit in said housing; nozzle means mounted in said housing and positioned to direct a fluid into and through the abrasive material to blast said material in said housing directly against the drill bit; said cover being turnable on said housing and about its axis to adjust the position of said shaft and drill bit carried thereby laterally with respect to said nozzle means and the direction of fluid discharged therefrom; said nozzle means having an axis inclined to the face of the bit, the direction of discharge from said nozzle means being inclined substantially to the face of the bit, whereby the fluid and abrasive material striking the bit rotate the bit and its supporting means and shaft; and means operatively connected to said shaft and including means which is selectively shiftable
  • abrasive blasting apparatus for drill hits: a housing adapted to contain a quantity of abrasive material; a cover closing the upper portion of said housing and turnable on said housing about its axis; a shaft rotatably carried by said cover eccentrically of and substantially parallel to the housing axis; means secured to said shaft for supporting a drill bit in said housing; nozzle means mounted in said housing and positioned to direct a fluid into and through the abrasive material to blast said material in said housing directly against the drill bit; said cover being turnable on said housing and about its axis to adjust the position of said shaft and drill bit carried thereby laterally with respect to said nozzle means and the direction of fluid discharged therefrom; said nozzle means having an axis inclined to the face of the bit, the direction of discharge from said nozzle means being inclined substantially to the face of the bit, whereby the fluid and abrasive material striking the bit rotate the bit and its supporting means and shaft; a rotor secured to said shaft; and a shiftable nozzle nozzle
  • abrasive blasting apparatus for drill hits: a housing adapted to contain a quantity of abrasive material; a cover closing the upper portion of said housing and turnable on said housing about its axis; a shaft rotatably carried by said cover eccentrically of and substantially parallel to the housing axis; means secured to said shaft for supporting a drill bit in said housing; nozzle means mounted in said housing and positioned to direct a fluid into and through the abrasive material to blast said material in said housing directly against the drill bit; said cover being turnable on said housing and about its axis to adjust the position of said shaft and drill bit carried thereby laterally with respect to said nozzle means and the direction of fluid discharged therefrom; means releasably securing said cover to said housing to retain said shaft and drill bit in various positions of adjustment relative to said nozzle means; said nozzle means having an axis inclined to the face of the bit, the direction of discharge from said nozzle means being inclined substantially to the face of the bit in such direction that the fluid and a
  • abrasive blasting apparatus for drill bits: means mounting the drill bit for rotation about an axis; means comprising a nozzle for blasting abrasive material against the drilling face of the drill bit; said nozzle having an axis inclined to the face of the bit; the direction of discharge from said nozzle being inclined substantially to the drillirig face of the bit, whereby the abrasive material striking the drilling face rotates the bit about said axis of rotation; a rotor secured to said mounting means; and a shiftable nozzle adapted to jet fluid against said rotor in one direction to resist rotation of said mounting means and bit or in another direction to assist rotation of said mounting means and bit.

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Description

Sept. 8, 1964 w. F. KEMPE APPARATUS FOR RESHARPENING DRILL BITS 2 Sheets-Sheet 2 Filed Dec. 3, 1962 INVENTOR 714547-52 F: HEMPE ATTORNE Y.
United States Patent 3,147,572 APPARATUS FOR RESHARPENING DRILL BITS Walter F. Kempe, Salt Lake City, Utah, assignor to Christensen Diamond Products Company, Salt Lake City, Utah, a corporation of Utah Filed Dec. 3, 1962, Ser. No. 241,816 18 Claims. (Cl. 51-15) The present invention relates to apparatus for sharpening bits, and more particularly to apparatus for sharpening bits having diamond cutting elements.
Diamond drill bits used in mining, oil well drilling, coring, concrete cutting, and similar operations, become dull as'a result of loss of diamond elements from the exposed faces of the matrices in which they are embedded. Diamond drill bits of the impregnated type have diamond cutting elements dispersed throughout the supporting matrix. As a result, a dull bit may be resharpened by removing some of the matrix material from the bit crown to expose additional diamonds. Such resharpening can be repeated whenever necessary so long as sufficient diamond elements are still present in the remaining matrix.
An object of the present invention is to provide an apparatus for sharpening diamond drill bits, and the like, by blasting abrasive particles against their cutting faces in such manner as to expose primarily the leading portions of the diamond cutting elements of the bit, without subs'tantially exposing their trailing portions, thereby effectively supporting the rear or trailing portions of the diamond elements by matrix material, and enhancing their useful life.
' Another object of the invention is to provide apparatus for sharpening a diamond drill bit, and the like, in which abrasive material is blasted against the bit in such manner as to rotate the bit in order that its entire circumference is subject to the abrasive stream.
A further object of the invention is to provide an apparatus for sharpening diamond drill bits, and the like, by blasting abrasive material against their cutting faces, the apparatus being readily adjusted to support drill bits of different sizes in appropriatedilferent positions, so. that the abrasive stream can act upon their working faces and expose the cutting elements embedded therein.
An additional object of the invention is to provide an apparatus for sharpening diamond drill bits, and the like, in which a stream of abrasive material is blasted against the bit to rotate it and also efiect its sharpening, and in which rotation of the bit may be retarded to prevent its overspeeding by the abrasive stream. If desired, rotation of the bit by the abrasive stream may be assisted in lieu of being retarded, as, for example, when the abrasive stream is rotating the bit at too slow a speed.
Yetanother object of the invention is to provide an apparatus for sharpening a diamond drill bit, and the like, by discharging a fluid stream from a nozzle or orifice through a mass of abrasive material to drive the latter against the bit, in which plugging of the nozzle or orifice by the abrasive material is prevented.
Still a further object of the invention is to provide an apparatus for blasting or jetting abrasive particles upon the drill bit, which can accommodate drill bits of various sizes, and which is comparatively simple, economical to manufacture, and of strong and sturdy construction.
This invention possesses many other advantages, and has other objects which may be made more clearly apparent from a consideration of a form in which it may be embodied. This form is shown in the drawings accompanying and forming part of the present specification. It will now be described in detail, for the purpose of illustrating the general principles of the invention; but it is to be understood that such detailed description Ice a the invention is best defined by the appended claims.
Referring to the drawings:
FIGURE 1 is a Vertical section through an apparatus embodying the invention;
FIG. 2 is a top plan view of the apparatus shown in FIG. 1;
FIG. 3 is a section taken along the line 3-3 on FIG. 2;
FIG. 4 is a cross-section taken along the line 4-4 on FIG. 1;
FIG. 5 is an enlarged fragmentary section taken along the line 55 on FIG. 1;
FIG. 6 is an enlarged vertical section taken along the line 66 on FIG. 1;
FIG. 7 is a cross-section taken along the line 7-7 on FIG. 6.
The apparatus illustrated in the drawings is adapted to sharpen a drill bit A, such as a diamond drill bit, disclosed in FIG. 1 as being mounted in the apparatus. Specifically, the bit illustrated is designed to cut a core, and includes a generally annular body 10 having an upper threaded pin 11 for connection to a tubular drill string (not shown), which is used in rotating the core bit. The lower portion 12 of the bit body may comprise a suitable matrix throughout which diamond particles or stones 13 are dispersed, the diamonds projecting from the bit crown, as from its lower face 14, inner face 15, and outer reaming face 16.
The diamonds or corresponding cutting elements 13 embedded in the matrix normally project from the matrix to some extent for operation upon the material in which the cutting action is being performed. The diamond elements may break off or otherwise become lost during the drilling operation, which severely reduces the drilling effectiveness of the drill bit. By virtue of the apparatus illustrated in the drawings, a portion of the matrix material may be eroded away by blasting abrasive particles against the cutting faces 14, 15, 16 of the bit, resulting in exposure of additional diamond elements in the matrix, whereupon the bit A can again be used for the purpose of drilling the hole in the particular material to which it is applied. The resharpening of a drill bit can take place repeatedly, so long as there are sufiicient diamond elements 13 embedded in its matrix.
As shown in the drawings, the apparatus includes an outer casing or housing 17 supported above a suitable surface S, such as the ground or floor, by supporting legs 18, the upper ends of which are received within housing sockets 19. The drill bit A can be appropriately supported Within an adapter 20 capable of accommodating bits having threaded pins 11, as illustrated, or threaded boxes (not shown). One side of the adapter 20 has a rubber or rubber-like ring 21 secured therewithin into which the threaded pin 11 of the bit can be forced. The opposite side of the adapter has a rubber or rubber-like ring 22 mounted on its periphery so that a threaded box of a drill bit (not shown) may be forced thereon.
The adapter 20 is mounted upon a vertical, rotatable shaft 23, either in the position illustrated in FIG. 1, when a bit with a threaded pin 11 is to be resharpened, or such adapter is inverted from the position shown and is mounted on the shaft with the external rubber ring 22 facing in a downward direction. The hub 24 of the adapter may have teeth 25 thereon adapted to be embedded in the periphery of the rotatable shaft 23, the adapter being releasably attached to the shaft by a screw 26, or the like, extending radially of the adapter and bearing against the shaft. The adapter 20 may be suitably placed on the shaft 23, preferably with the lower face 14 of the bit crown in substantially the same horizontal plane as the lower end of the shaft. The adapter 20 has circumferentially spaced longitudinal holes 27 therein for the passage of fluent material, and it may also Patented Sept. 8, 1964 have circumferentially spaced longitudinal passages 28 in its inner hub portion to permit passage of fluent material therethrough.
/ The shaft 23 is disposed vertically in the casing or housing 17, being supported from a lid or supporting cover 30 of the housing by suitable thrust bearings. As shown, a nut 31 is threaded on the upper end of the shaft 23 externally of the cover, the nut bearing against the outer race 32 of a ball thrust bearing 33, its lower race 34 engaging a spacer sleeve 35 which contacts the inner race 36 of a lower ball thrust bearing 37, the lower race 38 of which rests upon an inwardly directed cover flange 39 surrounding an opening 40 through the cover 36 receiving the shaft 23 and bearing structure 32. to 38. The shaft has an upwardly facing shoulder 41 bearing against the lower race 38 to resist upward movement of the shaft in the housing 17 A jetting or nozzle blasting device 42 includes a housing extension 43 which depends below the sump or hopper portion 44 of the housing 17, the latter being adapted to contain a suitable abrasive material, such as a grinding compound, si.icon carbide, or aluminum oxide, which, for example, may be of 36 to 60 mesh. The nozzle structure 42 is adapted to blast a fluid stream, such as a stream of water, upwardly through the mass of abrasive material to drive the latter against the exposed faces 14, 15, 16 of the bit, thevertical central portion of the crown of which preferably is aligned with the plane in which the fluid stream discharges from the nozzle structure.
The nozzle structure 42 includes the housing extension, previously referred to, to which a fluid or water inlet pipe 45 is connected, the water flowing through a housing inlet 46 into a chamber 47 in the housing extension. The lower end of the chamber is closed by a pliant, elastic diaphragm 48 clamped against the lower end of the housing extension by a lower cover 49 secured to the housing flange 58 by bolts 51. Assurance is had against leakage of fluid from the chamber 47 by providing a suitable sealing gasket 52, such as a rubber or rubberlike O-ring, in a groove 53 in the cover which engages the underside of the flexible diaphragm 48. diaphragm surrounds the lower stem 54 of a vertically disposed valve member or head 55.
The lower end of the stem 54 is constituted as a flange 56 engaging a spring seat 57 surrounding the stem to hold the seat against the central portion of the diaphragm 48 and press such central portion against the lower end of the valve head 55. A helical compression spring 58 is disposed in a socket 59 in the lower cover as, bearing against the base of the socket and against the spring seat 57 so as to urge the head 55 in an upward direction and across the inlet end 66 of an inclined orifice 61 formed in a nozzle 62 made of suitable material. Upward movement of the nozzle 62 is limited by engagement of its external flange 63 with a gasket or seal 64 surrounding the nozzle structure, the seal being forced against the opposed horizontal face 65 of the housing extension. The upper end 66 of the valve member or head is piloted within a nozzle socket 67, the inclined orifice 61 extending through the upper or base portion 68 of the socket, the periphery of the valve member or head being in spaced relation to the inner wall of the socket to form an annular passage 69 through which fluid can pass.
When the spring 58 moves the valve member 55 upwardly to engage its upper end 66 with the base 68 of the nozzle and across the inclined orifice 61, the latter is closed against the passage of fluid therethrough either in an upward or a downward direction. To insure against leakage of fluid between the valve member 55 and the base 68 of the nozzle, a suitable seal ring 78, such as a rubber or rubber-like O-ring, is disposed in a circumferential a ute angle groove 71 formed in the upper edge portion of the valve member. Such seal ring 70 will engage the base 68 of the nozzle when the valve head 55 is urged upwardly thereagainst by the spring 58, to insure The flexible against leakage of fluid around the head 55 and through the inclined orifice 61, or to insure against reverse flow of fluid downwardly through the orifice 61 and around the head 55.
To prevent foreign particles from passing upwardly into the orifice 61, which might effect its plugging, fluid entering the housing chamber 47 passes through a cylindrical screen or filter member 72, the lower end of which bears against the diaphragm 48 and the upper end of which bears against the nozzle flange 63, in order to hold the nozzle 62 in its upward position and compress the gasket seal 64 between the flange 63 and the housing 17.
The supporting cover 30 of the housing has a downwardly facing generally V-shaped circumferential groove 73 therein adapted to receive a companion-shaped housing rim 74. The axis 75 of rotation of the shaft 23 is eccentric to the center line 76 of the housing 17 and its cover 30 so that turning of the cover 30 on the housing will shift the shaft axis relative to the nozzle orifice 61 to obtain proper positioning of the crown portions of diamond drill bits mounted in the adapter with respect to the orifice. The larger the diameter of the drill bit A to be sharpened, the further away will the shaft 23 be disposed horizontally from the nozzle. The nozzle stream will be directed midway of the radial face 14 of the bit crown, diverging outwardly and inwardly of the bit thereof so that the abrasive particles blasted upwardly by the fluid stream emanating from the nozzle orifice will cover all faces 14, 15, 16 of the bit crown and effect their sharpening by exposing additional diamond elements. Appropriate indicia 77, 78 are provided for facilitating adjustment of the supporting cover 30 on the housing 18. Thus, a fluid outlet boss 79 extending from the upper portion of the housing adjacent to the cover may have a suitable indicating arrow 78 thereon and the upper outer margin of the cover 30 may have suitable indicia 77 thereon corresponding to bit sizes. By turning the cover 30 on the housing 17 until the size of the bit A in the housing, indicated by the cover indicia 77, is opposite the companion arrow 78, the bit crown is placed in the appropriate central position relative to the blasting orifice or nozzle 61. The supporting cover 30 may then be clamped in this position of adjustment.
As shown, the cover 30 is releasably clamped to the housing 17 by diametrically opposed clamp members 80, each clamp member having a horizontal arm 81 engaging the upper outer surface of the cover, this arm merging into a loop 82, which, in turn, merges into a shank or leg portion 83 extending through a hole 84 in a boss 86 integral with or secured to the housing 17, and extending outwardly thereof. A helical compression spring 87 encompasses the shank 83 with its upper end bearing against the underside of the boss 85 and its lower end engaging a washer 88 bearing against a nut 89 threaded on the lower portion of the shank or leg.
By grasping a loop 82 and exerting an upward force against the action of the spring 87, the arm 81 can be removed from the cover, after which the clamp member is turned and released, the arm then being disposed to one side of the cover. Upon replacement of the cover 30 on the housing 17, or its shifting to its appropriate adjusted position thereon, the clamp members may be pulled upwardly and turned to dispose their arms 81 over the cover, whereupon the clamp members are released to allow the springs 87 to shift and hold the arms downwardly against the cover 30 and clamp it to the housing 17.
It is to be noted that the orifice 61 is disposed in a vertical plane and is inclined substantially, as, for example, at an angle of about 45 degrees to the horizontal, so that the fluid stream issuing therefrom will pick up and blast the abrasive sharpening material in the sump 44 at an angle against the bit crown. In effect, the orifice 61 functions as a turbine nozzle to rotate the bit A in a lefthand direction. Accordingly, the fluid, such as water,
emanating from the nozzle 61 will notonly blast the abrasive particles in the hopper portion 44 of the housing against the crown of the bit, but it will also rotate the bit A, adapter 20, and shaft 23, the jet stream acting over the entire circumference and over all working face areas of the bit crown.
If the fluid stream directed against the bit crown rotates the bit A at too great a speed, or at too slow a speed, the speed can be retarded or increased by a hydraulic device mounted at the upper portion of the apparatus. As shown, an impeller or brake wheel 90 is mounted on the upper portion of the shaft 23, being secured thereto by a suitable screw 91 extending through the hub 92 and bearing against the shaft. The peripheral portion of the impeller has blades or teeth 93 against which a horizontal fluid stream from a nozzle or orifice 94 can be directed. Fluid, such as water, can enter the nozzle through a fluid inlet pipe 95, the nozzle being carried by the cover 30. As shown, an upper flange 96 of the nozzle engages the upper side of the cover 30. The nozzle can be clamped in diflerent positions of adjustment by a clamp nut 97 threaded on the nozzle and adapted to bear against the underside of the cover 30. By loosening the clamp nut 97, the nozzle can be turned in the cover to a position in which its horizontal orifice 94 can direct the jet of water against the teeth 93 to tend to rotate the rotor 90 in a counterclockwise direction, which is the same direction as the shaft 23 and bit are being turned by the jet stream issuing from the blasting nozzle or orifice 61. When in that position, rotation of the diamond drill bit A will be assisted. If, however, the clamp nut 97 is loosened and the nozzle 94 turned so that its orifice faces in another direction to impinge against the teeth 93 and tend to rotate the turbine rotor 90 in a clockwise direction, such action will serve as a hydraulic brake to resist rotation of the bit A by the jet stream issuing from the blasting orifice 61. The brake or drive nozzle 94 can be adjusted in the cover 30 to occupy one position or another, and will then be locked in such position by tightening the lock nut 97 against the underside of the cover. The
driving or braking position of the nozzle can be indicated by a suitable pointer 98 formed on the nozzle which coacts with suitable indicia 99 on the cover adjacent thereto (FIG. 2
Usually, for relatively small bits A, the jet stream issuing from the blasting nozzle 61 tends to rotate the bit at too high a speed, in which event the upper nozzle 94 will be adjusted to occupy a position to direct a stream in a countering direction against the rotor blades or teeth 93, thereby functioning of the hydraulic brake. If, however, a large diameter bit is to be sharpened, the stream emanating from the blasting nozzle 61 may be incapable of turning it at a sufiicient speed, in which event the upper nozzle 94 will be adjusted to direct its stream against the turbine wheel or rotor 90 and assist the rotation of the bit in a counterclockwise direction.
In the use of the apparatus, the bit A is mounted in an adapter 20 of a suitable size, which is then slipped over the shaft 23 and placed in appropriate position thereon, the screw 26 being tightened to firmly attach the adapter to the shaft. Surrounding the shaft 23, bit A, and adapter 20 is a baffle structure, including a cylindrical inner enclosure 100, its lower end resting upon a lower shoulder 101 at the upper end of the sump or hopper portion 44 of the housing 17. This inner enclosure has its upper end 102 terminating below the turbine wheel 90 and has a plurality of longitudinally spaced annular deflectors 103 welded or otherwise secured thereto which serve to minimize the tendency of the abrasive material to rise in the housing with the fluid or water stream. As the water or other fluid emanating from the blasting nozzle 61 jets through the abrasive material to drive the latter against the bit A, the water and abrasive material will then pass laterally inwardly and outwardly of the bit, the fluent mixture rising in the housing 17 and within the inner enclosure 100. The abrasive particles, being heavier, will tend to drop out of the liquid back into the hopper 44 and such action is facilitated by the longitudinal passages 27, 28 through the bit adapter 20 and between the hub 24 of the adapter and the shaft 23. The liquid rises in the housing over the uppermost baflle plate 103, flowing toward a liquid outlet 105 that has a suitable pipe 106 connected thereto, the outlet being provided in the boss 7 9 carrying the indicating arrow 78.
An outer cylindrical enclosure 107 surrounds the inner enclosure 100 in spaced relation thereto, its lower end resting upon supporting lugs 108 projecting inwardly from the wall of the outer casing or housing 17. Abrasive particles that may still remain in the liquid when it passes over the uppermost transverse baffle member 103 can drop downwardly into the annular space 109 between the inner and outer enclosures 100, 107. Liquid passing around the upper end 110 of the outer enclosure, which extends upwardly above the upper baflie member 103, can still drop abrasive particles down into the annular space 111 between the outer enclosure 107 and the inner wall of the housing 17. If the lower part of the housing 17 between the inner enclosure 100 and the housing wall contains a substantial amount of abrasive material, such material can readily be shifted back into the sump or hopper portion 44 of the housing by elevating the enclosures 100, 107 from the shoulder 101 and supporting lugs 108.
In sharpening the bit A, it is mounted in the adapter 20 and the latter mounted on the shaft 23 in the manner described above. The upper nozzle 94 is adjusted to its braking or drive position, depending upon the size of the bit mounted in the adapter. The cover 30, with the nozzle 94, turbine wheel 90, shaft 23, adapter 20, and bit A carried thereby is then disposed above the housing and the bit, adapter and shaft inserted down through the bafiies 103 until the cover engages the rim 74. The cover 30 is then turned to align the bit size identification 77 with the boss indicator 78, whereupon the clamp loops 82 are pulled upwardly and turned to place their arms 81 against the cover to hold the latter against the housing rim (FIG. 5). Fluid, such as water, from a suitable source and at a proper pressure is then allowed to enter the fluid inlet pipes 45, 95. The fluid under pressure flows into the chamber 47 and passes through the screen 72, acting upon the diaphragm 48 and urging its central portion downwardly to shift the valve head 55 from its engaging seat provided by the base 68 of the blasting nozzle 62, the water then passing around the upper peripheral portion of the valve head 55 and into the inclined orifice 61. The water emanates at high velocity from the nozzle orifice 61, blasting through the abrasive particles in the hopper portion 44 and driving them in an inclined direction against the crown of the bit A, rotating the bit in a counterclockwise direction and causing the stream of jetted particles to cover the entire circumference and all surfaces 14, 15, 16 of the bit crown. Depending upon the adjustment of the upper nozzle 94, the water or other liquid issuing from its orifice 98 will act upon the rotor 90 and either assist or retard the action of the lower nozzle stream in rotating the bit, resulting in turning of the bit at the desired speed.
It is to be noted that the nozzle 61 jets the abrasive particles against the bit matrix in advance of each diamond element 13, and will erode away the matrix material in advance of the diamond element as regards clockwise turning of the bit when drilling a hole. A much lesser erosion will occur at the trailing sides of the diamond elements 13, matrix material remaining to support such trailing side and thereby minimizing breakage, or other fracture, and loss of diamond elements from the bit. As noted above, the inclination of the orifice 61 not only effects the sharpening of the bit by exposing the leading portions of the diamond elements 13, but also provides the motivating fluid for rotating the bit about the shaft axis 75. As stated above, the stream issuing from the nozzle 61 will blast the abrasive particles over the entire face or crown of the bit, and effectively sharpen the latter by exposing the diamond cutting elements 13.
After the bit has been sharpened, the supply of Water or other liquid to the nozzles 62, 94 is shut off. As soon as the pressure of the water decreases to a sufiicient degree, the spring 58 will shift the head 55 upwardly against its companion seat or nozzle base 68 to close the orifice 61. Such closing of the orifice 61 prevents liquid from flowing back through it and prevents abrasive particles from being carried back into the orifice and possibly plug it or restrict subsequent flow of liquid therethrough. Thus, the orifice 61 is automatically closed when liquid is not passing through it and is automatically opened when liquid under pressure is again allowed to flow through the inlet pipe 45 into the housing chamber 47.
In the event that a different size bit is to be sharpened, it is mounted in the adapter 20, which is again appropriately fixed to the shaft 23 and the apparatus reinserted in the housing 17, the cover 39 being turned so that the bit and shaft axis 75 are again shifted relative to the blasting nozzle orifice 61 to properly locate the bit crown with respect thereto, the operator being able to use the convenient indicia 77 on the housing cover 30 for this purpose. The clamps 80 are then shifted over the housing cover 30 to hold it in place and the liquid again allowed to pass into the upper and lower nozzles 94, 62, the upper nozzle 94 having first been appropriately positioned to function as a turbine drive device or as a hydraulic brake with respect to the turbine rotor 90.
I claim:
1. In abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis; means adapted to contain a quantity of abrasive material; said mounting means supporting the drill bit adjacent to the quantity of abrasive material in said containing means; nozzle means having an axis inclined to the face of said bit and positioned to direct a fluid into and through the abrasive material to blast said material in said containing means directly against the drill bit; the direction of discharge from said nozzle means being substantially inclined to the face of said bit, whereby the fluid and abrasive material striking the bit rotate the bit about said axis of rotation.
2. In abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis; means adapted to contain a quantity of abrasive material; said mounting means supporting the drill bit adjacent to the quantity of abrasive material in said containing means; nozzle means having an axis inclined to the face of said list and positioned to direct a fluid into and through the abrasive material to blast said material in said containing means directly against the drill bit; the direction of discharge from said nozzle means being inclined substantially to the face of said bit in such direction that the fluid and abrasive material striking the bit rotate the bit counterclockwise about said axis of rotation.
3. In abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis; means adapted to contain a quantity of abrasive material; said mounting means supporting the drill bit adjacent to the quantity of abrasive material in said containing means; nozzle means having an axis inclined to the face of said bit and positioned to direct a fluid into and through the abrasive material to blast said material in said containing means directly against the drill bit; the direction of discharge from said nozzle means being inclined substantially to the face of said bit, whereby the fluid and abrasive material striking the bit rotate the bit about said axis of rotation; and means for varying the position of said mounting means to shift said rotational axis with respect to said nozzle means and the direction of discharge of fluid therefrom.
4. In abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis;
means comprising a nozzle for blasting abrasive material against the drilling face of the drill bit; said nozzle having an axis inclined to the face of the bit, the direction of discharge from said nozzle being inclined substantially to the drilling face of the bit, whereby the abrasive material striking the drilling face rotates the bit about said axis of rotation.
5. In abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis; means comprising a nozzle for blasting abrasive material against the drilling face of the drill bit; said nozzle having an axis inclined to the face of the bit; the direction of discharge frorn said nozzle being inclined substantially to the drilling face of the bit in such direction that the abrasive material striking the drilling face rotates the bit counterclockwise about said axis of rotation.
6. In abrasive blasting apparatus for drill bits: means for mounting the drill bit forrotation about an axis; means comprising a nozzle for blasting abrasive material against the drilling face of the drill bit; said nozzle having an axis inclined to the face of the bit; the direction of discharge from said nozzle being inclined substantially to the drilling face of the bit, whereby the abrasive material striking the drilling face rotates the bit about said axis of rotation; and means for varying the position of said supporting means to shift said rotational axis with respect to said nozzle and the direction of discharge therefrom.
7, In abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis; means adapted to contain a quantity of abrasive material; said mounting means supporting the drill bit adjacent to the quantity of abrasive material in said containing means; nozzle means having an axis inclined to the face of said bit and positioned to direct a fluid into and through the abrasive material to blast said material in said containing means directly against the drill bit; the direction of discharge from said nozzle means being inclined substantially to the face of said bit, whereby the fluid and abrasive material striking the bit rotate the bit about said axis of rotation; and brake means operatively connected to said mounting means for retarding rotation of the bit by the fluid and abrasive material striking thereagainst.
8. In abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis; means adapted to contain a quantity of abrasive material; said mounting means supporting the drill bit adjacent to the quantity of abrasive material in said containing means; nozzle means having an axis inclined to the face of said bit and positioned to direct a fluid into and through the abrasive material to blast said material in said containing means directly against the drill bit; the direction of discharge from said nozzle means being inclined substantially to the face of said bit, whereby the fluid and abrasive material striking the bit rotate the bit about said axis of rotation; and means operatively connected to said mounting means and selectively shiftable to retard rotation of the bit by the fluid and abrasive material striking thereagainst or to assist such rotation of the bit.
9. In abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis; means comprising a nozzle for blasting abrasive material against the drilling face of the drill bit; said nozzle having an axis inclined to the face of the bit; the direction of discharge from said nozzle being inclined substantially to the drilling face of the bit, whereby the abrasive material striking the drilling face rotates the bit about said axis of rotation; and brake means operatively connected to said mounting means for retarding rotation of the bit by the material striking thereagainst.
10. In abrasive blasting apparatus for drill bits: means for mounting the drill bit for rotation about an axis; means comprising a nozzle for blasting abrasive material against the drilling face of the drill bit; said nozzle having an axis inclined to the face of the bit; the direction of discharge from said nozzle being inclined substantially to the drilling face of the bit, whereby theabrasive material striking the drilling face rotates the bit about said axis of rotation; and means operatively connected to said mounting means and selectively shiftable to retard rotation of the bit by the material striking thereagainst or to assist such rotation of the bit.
11. In abrasive blasting apparatus for drill bits: a housing adapted to contain a quantity of abrasive material; a cover closing the upper portion of said housing and turnable on said housing about its axis; a shaft rotatably carried by said cover eccentrically of and substantially parallel to the housing axis; means secured to said shaft for supporting a drill bit in said housing; nozzle means mounted in said housing and positioned to direct a fluid into and through the abrasive material to blast said material in said housing directly against the drill bit; said cover being turnable on said housing and about its axis to adjust the position of said shaft and drill bit carried thereby laterally with respect to said nozzle means and the direction of fluid discharged therefrom.
12. In abrasive blasting apparatus for drill bits: a housing adapted to contain a quantity of abrasive material; a cover closing the upper portion of said housing and turnable on said housing about its axis; a shaft rotatably carried by said cover eccentrically of and substantially parallel to the housing axis; means secured to said shaft for supporting a drill bit in said housing; nozzle means mounted in said housing and positioned to direct a fluid into and through the abrasive material to blast said material in said housing directly against the drill bit; said cover being turnable on said housing and about its axis to adjust the position of said shaft and drill bit carried thereby laterally with respect to said nozzle means and the direction of fluid discharged therefrom; said nozzle means having an axis inclined to the face of the bit, the direction of discharge from said nozzle means being inclined substantially to the face of the bit, whereby the fiuid and abrasive material striking the bit rotate the bit and its supporting means and shaft.
13. In abrasive blasting apparatus for drill bits: a housing adapted to contain a quantity of abrasive material; a cover closing the upper portion of said housing and turnable on said housing about its axis; a shaft rotatably carried by said cover eccentrically of and substantially parallel to the housing axis; means secured to said shaft for supporting a drill bit in said housing; nozzle means mounted in said housing and positioned to direct a fluid into and through the abrasive material to blast said material in said housing directly against the drill bit; said cover being turnable on said housing and about its axis to adjust the position of said shaft and drill bit carried thereby laterally with respect to said nozzle means and the direction of fluid discharged therefrom; said nozzle means having an axis inclined to the face of the bit, the direction of discharge from said nozzle means being inclined substantially to the face of the bit in such direction that the fluid and abrasive material striking the bit rotate the bit and its supporting means and shaft counterclockwise about the axis of said shaft.
14. In abrasive blasting apparatus for drill bits: a housing adapted to contain a quantity of abrasive material; a cover closing the upper portion of said housing and turnable on said housing about its axis; a shaft rotatably carried by said cover eccentrically of and substantially parallel to the housing axis; means secured to said shaft for supporting a drill bit in said housing; nozzle means mounted in said housing and positioned to direct a fluid into and through the abrasive material to blast said material in said housing directly against the drill bit; said cover being turnable on said housing and about its axis to adjust the position of said shaft and drill bit carried thereby laterally with respect to said nozzle means and the direction of fluid discharged therefrom; said nozzle means having an axis inclined to the face of the bit, the direction of discharge from said nozzle means being inclined sub- 10 stantially to the face of the bit,whereby the fluid and abrasive material striking the bit rotate the bit and its supporting means and shaft; and brake means operatively connected to said shaft for retarding rotation of the shaft by the fluid and abrasive material striking thereagainst.
15. In abrasive blasting apparatus for drill hits: a housing adapted to contain a quantity of abrasive material; a cover closing the upper portion of said housing and turnable on said housing about its axis; a shaft rotatably carried by said cover eccentrically of and substantially parallel to the housing axis; means secured to said shaft for supporting a drill bit in said housing; nozzle means mounted in said housing and positioned to direct a fluid into and through the abrasive material to blast said material in said housing directly against the drill bit; said cover being turnable on said housing and about its axis to adjust the position of said shaft and drill bit carried thereby laterally with respect to said nozzle means and the direction of fluid discharged therefrom; said nozzle means having an axis inclined to the face of the bit, the direction of discharge from said nozzle means being inclined substantially to the face of the bit, whereby the fluid and abrasive material striking the bit rotate the bit and its supporting means and shaft; and means operatively connected to said shaft and including means which is selectively shiftable to either retard rotation of the bit by the fluid and abrasive material striking thereagainst or to assist such rotation of the bit.
16. In abrasive blasting apparatus for drill hits: a housing adapted to contain a quantity of abrasive material; a cover closing the upper portion of said housing and turnable on said housing about its axis; a shaft rotatably carried by said cover eccentrically of and substantially parallel to the housing axis; means secured to said shaft for supporting a drill bit in said housing; nozzle means mounted in said housing and positioned to direct a fluid into and through the abrasive material to blast said material in said housing directly against the drill bit; said cover being turnable on said housing and about its axis to adjust the position of said shaft and drill bit carried thereby laterally with respect to said nozzle means and the direction of fluid discharged therefrom; said nozzle means having an axis inclined to the face of the bit, the direction of discharge from said nozzle means being inclined substantially to the face of the bit, whereby the fluid and abrasive material striking the bit rotate the bit and its supporting means and shaft; a rotor secured to said shaft; and a shiftable nozzle adapted to jet fluid against said rotor in one direction to resist rotation of said shaft and bit or in another direction to assist rotation of said shaft and bit.
17. In abrasive blasting apparatus for drill hits: a housing adapted to contain a quantity of abrasive material; a cover closing the upper portion of said housing and turnable on said housing about its axis; a shaft rotatably carried by said cover eccentrically of and substantially parallel to the housing axis; means secured to said shaft for supporting a drill bit in said housing; nozzle means mounted in said housing and positioned to direct a fluid into and through the abrasive material to blast said material in said housing directly against the drill bit; said cover being turnable on said housing and about its axis to adjust the position of said shaft and drill bit carried thereby laterally with respect to said nozzle means and the direction of fluid discharged therefrom; means releasably securing said cover to said housing to retain said shaft and drill bit in various positions of adjustment relative to said nozzle means; said nozzle means having an axis inclined to the face of the bit, the direction of discharge from said nozzle means being inclined substantially to the face of the bit in such direction that the fluid and abrasive material striking the bit rotate the bit and its supporting means and shaft counterclockwise about the axis of said shaft; a rotor secured to said shaft; and a shiftable nozzle adapted to jet fluid against said rotor in a clockwise direction to resist counterclockwise rotation of said shaft and bit, or in a counterclockwise direction to assist counterclockwise rotation of said shaft and bit. 1
18. In abrasive blasting apparatus for drill bits: means mounting the drill bit for rotation about an axis; means comprising a nozzle for blasting abrasive material against the drilling face of the drill bit; said nozzle having an axis inclined to the face of the bit; the direction of discharge from said nozzle being inclined substantially to the drillirig face of the bit, whereby the abrasive material striking the drilling face rotates the bit about said axis of rotation; a rotor secured to said mounting means; and a shiftable nozzle adapted to jet fluid against said rotor in one direction to resist rotation of said mounting means and bit or in another direction to assist rotation of said mounting means and bit.
References Cited in the file of this patent UNITED STATES PATENTS 2,395,420 Myers Feb. 26, 1946 2,594,735 Crumley Apr. 29, 1952 2,692,458 Lawrence Oct. 26, 1954 10 3,044,219 Cutler July 17, 1962 FOREIGN PATENTS 505,152 France Apr. 29, 1920

Claims (1)

  1. 4. IN ABRASIVE BLASTING APPARATUS FOR DRILL BITS: MEANS FOR MOUNTING THE DRILL BIT FOR ROTATION ABOUT AN AXIS; MEANS COMPRISING A NOZZLE FOR BLASTING ABRASIVE MATERIAL AGAINST THE DRILLING FACE OF THE DRILL BIT; SAID NOZZLE HAVING AN AXIS INCLINED TO THE FACE OF THE BIT, THE DIRECTION OF DISCHARGE FROM SAID NOZZLE BEING INCLINED SUBSTANTIALLY TO THE DRILLING FACE OF THE BIT, WHEREBY THE ABRASIVE MATERIAL STRIKING THE DRILLING FACE ROTATES THE BIT ABOUT SAID AXIS OF ROTATION.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747276A (en) * 1971-05-07 1973-07-24 Christensen Diamond Prod Co Method and apparatus for contouring and sharpening circular saws
US3818997A (en) * 1972-11-06 1974-06-25 Christensen Diamond Prod Co Apparatus and method for situ sharpening of bore hole bits
US5762538A (en) * 1996-03-25 1998-06-09 Kennametal Inc. Method and apparatus for honing an elongate rotary tool
US7063594B1 (en) 2005-01-31 2006-06-20 Pratt & Whitney Canada Corp. Cutting edge honing process
US20090075563A1 (en) * 2007-09-13 2009-03-19 Lemacher Kevin Method and apparatus for sharpening hardened tools

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR505152A (en) * 1919-03-06 1920-07-24 Gabriel Duclos Automatic machine for sanding spiral bits and drills and other parts liable to roll
US2395420A (en) * 1944-10-04 1946-02-26 William M Myers Control valve
US2594735A (en) * 1949-04-12 1952-04-29 Ernest W Crumley Angle head abrasive blast nozzle
US2692458A (en) * 1951-12-12 1954-10-26 United States Steel Corp Apparatus for cleaning and descaling tubular articles by abrasive blasting
US3044219A (en) * 1959-02-09 1962-07-17 Christensen Diamond Prod Co Apparatus for resharpening diamond drill bits

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR505152A (en) * 1919-03-06 1920-07-24 Gabriel Duclos Automatic machine for sanding spiral bits and drills and other parts liable to roll
US2395420A (en) * 1944-10-04 1946-02-26 William M Myers Control valve
US2594735A (en) * 1949-04-12 1952-04-29 Ernest W Crumley Angle head abrasive blast nozzle
US2692458A (en) * 1951-12-12 1954-10-26 United States Steel Corp Apparatus for cleaning and descaling tubular articles by abrasive blasting
US3044219A (en) * 1959-02-09 1962-07-17 Christensen Diamond Prod Co Apparatus for resharpening diamond drill bits

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747276A (en) * 1971-05-07 1973-07-24 Christensen Diamond Prod Co Method and apparatus for contouring and sharpening circular saws
US3818997A (en) * 1972-11-06 1974-06-25 Christensen Diamond Prod Co Apparatus and method for situ sharpening of bore hole bits
US5762538A (en) * 1996-03-25 1998-06-09 Kennametal Inc. Method and apparatus for honing an elongate rotary tool
US7063594B1 (en) 2005-01-31 2006-06-20 Pratt & Whitney Canada Corp. Cutting edge honing process
US20090075563A1 (en) * 2007-09-13 2009-03-19 Lemacher Kevin Method and apparatus for sharpening hardened tools

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