US3851714A - Rotary drilling head and method of breaking pipe joints - Google Patents
Rotary drilling head and method of breaking pipe joints Download PDFInfo
- Publication number
- US3851714A US3851714A US00427488A US42748873A US3851714A US 3851714 A US3851714 A US 3851714A US 00427488 A US00427488 A US 00427488A US 42748873 A US42748873 A US 42748873A US 3851714 A US3851714 A US 3851714A
- Authority
- US
- United States
- Prior art keywords
- spindle
- pipe
- plunger
- head
- rotary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/16—Connecting or disconnecting pipe couplings or joints
- E21B19/167—Connecting or disconnecting pipe couplings or joints using a wrench adapted to engage a non circular section of pipe, e.g. a section with flats or splines
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49815—Disassembling
- Y10T29/49822—Disassembling by applying force
Definitions
- This invention relates to rotary driving heads for rotating the bit carried by a string of drill pipe.
- an object of the present invention is to provide a novel rotary drilling head which can be operated by a single workman with a substantially reduced number of trips between the control panel and the drilling installation, thus substantially reducing the man hours required in withdrawing the drill string from the hole.
- Another object is to eliminate the use of loose wrenches heretofore utilized in withdrawing pipe from the hole, thereby permitting the drilling of a hole at any angle.
- the novel rotary drilling head has a hollow drilling spindle at the free end of which is a box tool joint for threaded attachment to the pin joint at the end of a drill pipe section.
- a fluid-actuated plunger Slidable within the interior of the spindle is a fluid-actuated plunger having external splines normally meshing with splineways in the splindle wall and capable, in the'advanced position of the plunger, of cooperating with internal splines in the pin joint of a connected pipe section for locking together the spindle and the pipe section whereby reverse rotation of the rotary head will unscrew the pipe section from its lower or remote coupling.
- Both the control fluid for the plunger and the controls for the spindle powering means are remotely located so that a single operator can withdraw the piping from the hole, including breaking out the tightly made-up joints. with minimum trips from the control position to the drilling installation.
- FIG. 3a shows a separate open wrench used with prior art equipment.
- FIG. 3b shows a torquing device also used with the prior art head.
- FIGS. 4, 5, and 6 are similar schematic views illustrating the simplified procedure in withdrawing a drill string from the hole, utilizing the novel rotary drilling head
- FIG. 4a is a plan view of the pipe clamp.
- the novel rotary drilling head as shown in FIGS. 1 i and 2 consists of a hollow casing 8 having apertured lugs 9 and 10 projecting sidewardly thereof for mounting on a suitable mast or support along which the rotary head may be propelled to insert the drill pipe and bit into the hole and remove the same therefrom, as explained hereafter.
- the gear housing 11 At the rear end of casing 8 there is mounted the gear housing 11, enclosing a planetary gear system 12.
- a powering motor 13, usually fluid driven, is mounted on housing 11.
- Drive shaft 14 interconnects the gearing with a drive spindle 15 having an internal chamber 16 and rearwardly mounted in bearings 17.
- Drive shaft 14 is nonrotatably connected to spindle counterbore 18 by rectangular and cylindrical keys l9 and 20 and an intervening bushing 21.
- Gear housing 11 is secured to casing 8 by bolts 22.
- casing 8 The front end of casing 8 is closed by a cap 23 secured to casing 8 by cap screws 24 and including a forwardly projecting neck 25 incorporating seal packings 26, 27, and 28 between the same and spindle 15.
- An 0- ring seal 29 is inserted between cap 23 and casing 8.
- Porting 30 in the casing connects pressured fluid piping 31 from a control valve (not shown) to an annulus 32 in cap 23.
- Other ports 33 connect the annulus to the forward portion 48 of spindle chamber 16.
- a plunger 34 is slidable longitudinally within the chamber 16 of spindle 15 and is constantly urged rearwardly by a coiled compression spring 35 seated at its left end against a guide and spring seat collar 36 having internal splineways 37 and secured in position at the left end of the spindle chamber by means of a pen 38.
- the plunger has a forwardly extending stem or shank 39 provided with splines 40 which slide in complementary internal splineways 37 in guide collar 36.
- a female or box tool joint 42 is formed at the forward end of spindle l5 and has the usual tapered threads for meshing with complementary threads on a male or pin tool joint $3, as at 44.
- Pin joint 43 is welded, as at 45, to the end of drill pipe 46, and has internal splineways 47 for meshing with plunger splines 40 in the advanced position of the plunger (FIG. I as will be explained.
- Tubing 50 connects pressured fluid from a control valve (not shown) through a port 51 to an annulus 52, thence through ports 53 to spindle chamber 16.
- FIG. 1 shows the novel breakout plunger 34 advanced intothe coupled pin joint 43 for locking together spindle 15 and drill pipe 46. This action of the plunger is produced by the supply of pressured control fluid through piping 50.
- FIG. 2 shows plunger 34 fully retracted within spindle chamber 16 by expansion of compression spring 35 upon cutoff of control pressure in pipe 50 and exhausting of chamber 16.
- FIG. 3 illustrates, schematically, the conventional prior art equipment used in drilling a hole through rock, for instance, a shot hole, and withdrawing the drill string from the hole, as at the end of drilling or to replace a bit.
- a conventional rotary drilling head which is slidably carried on a mast or other support 57 having a base ledge 58.
- drill pipe 59 is shown depending into the borehole 60.
- Lower drill pipe section 59 and upper drill pipe section 61 are provided with conventional threaded pin and box tool joints, respectively, at their upper and lower ends, while drive spindle 62 depending from the rotary head is provided with a threaded box joint for coupling to the pin joint at the upper end of pipe 61.
- These couplings arerepresented by lines 54 and 55.
- the tool joints on these drill pipes are provided with opposite wrench recesses or flats as at 63, 64, and 65.
- a loose or separate pipeholding wrench is indicated at 66.
- a powered pipe torquing device is shown at 67.
- Mechanism for moving head 56 along mast 57 is represented by a cable 72 encompassing pulleys 73 and 74 on mast 57 and connected at its ends to head 56.
- a drive motor for the cable is shown at 75.
- controls for fluid lines 56a for rotary drilling head 56 as well as the mechanism for lowering or advancing and lifting or withdrawing the pipe string and torquing device 67 are located conveniently for the operator and usually away from the mast.
- FIGS. 4, 5, and 6 schematically represent equipment used with the novel rotary drilling head in inserting and withdrawing drill pipe into and from the borehole.
- Rotary head 80 is slidably supported on a suitable mast or frame 81, with base ledge 81a, for movements therealong by suitable means, as at 72, 73, 741, 75 in FIG. 3.
- a powered pipe gripping device 32 mounted on the frame slightly above ledge 81a, has jaws 83 and 84 pivotally connected at 85 and urged together to grip a pipe between serrated faces 86 and apart to release the pipe by a fluid motor 87.
- the tool joint connection between spindle 42 and pipe 88 is represented by line 89 and the joint between pipes 88 and 90, the latter entering borehole 91 is represented at 92. No wrench flats or other special configurations are provided on the tool joints.
- the exterior of the tool joints remains smoothly cylindrical, no exterior configurations for wrenches and torquing tools being required, thus reducing wear due to contact with the bore wall, since the splining for accomodating the breakout plunger is located in the protected inner walls of the tool joints.
- the roatry head except for the novel breakout means, and the supporting mast arrangement, may be modified as will occur to those skilled in the art. Exclusive use of all modifications as will occur to those skilled in the art is contemplated.
- a rotary driving head for a drill string comprising a casing, a drive spindle projecting therefrom, coupling means rotatable with said spindle for attachment to complementary coupling means on the end of a drill pipe, plunger means movable along said spindle, torque applying means on said plunger means for cooperating with complementary torque receiving means on the drill pipe coupling means, and means for shifting said plunger means between a retracted position clear of said coupling means and an advanced position projecting into said coupling means for locking said coupling means together.
- a rotary driving head as described in claim 1 in which said spindle has a threaded coupling at its free end for attachment to a threaded complementary coupling on a drill pipe;
- a rotary driving head as described in claim 3 further including means for applying pressured fluid to said plunger for actuating the same to and from its retracted and advanced positions.
- a rotary driving head as described in claim 4 further including spring-means for actuating said plunger in one direction and a control for said pressured fluid for selectively actuating said plunger in the other direction.
- a rotary driving head for a drill string comprising a casing and powering means, a hollow drive spindle projecting forwardly from said casing and having an internal chamber and. a tool joint at its forward end, an
- an externally splined plunger reciprocable in said spindle chamber from a retracted position wholly within said chamber to an extended position projecting forwardly of said chamber for cooperating with a complementarily splined pipe coupling to secure said spindle and said coupling against relative rotation.
- a rotary driving head as described in claim 7 in combination with a complementary tool joint threadedly coupled to said joint with internal splines for mating with the splined plunger in the advanced position thereof.
- a rotary driving head as described in claim 7 in combination with support means movably mounting said head and a remotely controlled pipe gripping device for application to a pipe string on the side of a joint to be broken opposite to said rotary head.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Drilling And Boring (AREA)
Priority Applications (13)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00427488A US3851714A (en) | 1973-12-26 | 1973-12-26 | Rotary drilling head and method of breaking pipe joints |
| CA215,222A CA997750A (en) | 1973-12-26 | 1974-12-04 | Rotary drilling head and method of breaking pipe joints |
| ZA00748091A ZA748091B (en) | 1973-12-26 | 1974-12-19 | Improvements relating to rotary driving heads |
| SE7416155A SE412432B (sv) | 1973-12-26 | 1974-12-20 | Roterbart drivhuvud. |
| DE2461112A DE2461112C3 (de) | 1973-12-26 | 1974-12-23 | Drehbohrkopf |
| BE151882A BE823787A (fr) | 1973-12-26 | 1974-12-23 | Tete tournante d'entrainement pour forages |
| BR10732/74A BR7410732D0 (pt) | 1973-12-26 | 1974-12-23 | Cabecote rotativo de propulsao para uma coluna de perfuracao e processo para desfazer uma junta de tubo em uma coluna de tubos de perfuracao |
| ES433283A ES433283A1 (es) | 1973-12-26 | 1974-12-23 | Cabezal de accionamiento giratorio para columna de perfora- cion. |
| AU76762/74A AU486611B2 (en) | 1973-12-26 | 1974-12-23 | Improvements relating to rotary driving heads |
| GB5569674A GB1464149A (en) | 1973-12-26 | 1974-12-24 | Rotary driving heads for drill strings |
| JP14848474A JPS5431721B2 (de) | 1973-12-26 | 1974-12-26 | |
| FR7442903A FR2256308B1 (de) | 1973-12-26 | 1974-12-26 | |
| AR257078A AR217613A1 (es) | 1973-12-26 | 1974-12-26 | Cabeza impulsora rotativa para columnas de perforacion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00427488A US3851714A (en) | 1973-12-26 | 1973-12-26 | Rotary drilling head and method of breaking pipe joints |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3851714A true US3851714A (en) | 1974-12-03 |
Family
ID=23695082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00427488A Expired - Lifetime US3851714A (en) | 1973-12-26 | 1973-12-26 | Rotary drilling head and method of breaking pipe joints |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US3851714A (de) |
| JP (1) | JPS5431721B2 (de) |
| AR (1) | AR217613A1 (de) |
| BE (1) | BE823787A (de) |
| BR (1) | BR7410732D0 (de) |
| CA (1) | CA997750A (de) |
| DE (1) | DE2461112C3 (de) |
| ES (1) | ES433283A1 (de) |
| FR (1) | FR2256308B1 (de) |
| GB (1) | GB1464149A (de) |
| SE (1) | SE412432B (de) |
| ZA (1) | ZA748091B (de) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4114698A (en) * | 1975-02-20 | 1978-09-19 | Smith International, Inc. | Method and apparatus for tunneling upwardly |
| US4147215A (en) * | 1978-03-09 | 1979-04-03 | Hughes Tool Company | Independently powered breakout apparatus and method for a sectional drill string |
| US4194579A (en) * | 1976-08-09 | 1980-03-25 | Joy Manufacturing Company | Drilling apparatus and method |
| US4239083A (en) * | 1979-05-07 | 1980-12-16 | Baker International Corporation | Method and apparatus for rotating tubing conduits |
| US4373584A (en) * | 1979-05-07 | 1983-02-15 | Baker International Corporation | Single trip tubing hanger assembly |
| US4391331A (en) * | 1979-08-10 | 1983-07-05 | Constructors John Brown Limited | Guides for use in forming pipe connections and a process of forming pipe connections |
| DE3324334A1 (de) * | 1982-07-07 | 1984-01-12 | Osakeyhtiö Tampella AB, 33100 Tampere | Oeffnungsvorrichtung fuer eine bohrstange einer bohranlage mit verlaengerbarer bohrstange |
| DE3635377A1 (de) * | 1985-10-22 | 1987-04-23 | Tampella Oy Ab | Bohrgeraet fuer lange bohrungen |
| EP0595439A3 (de) * | 1992-10-29 | 1995-05-31 | Charles Machine Works | Aufbrechvorrichtung für Bohrgestänge. |
| US5762148A (en) * | 1995-04-01 | 1998-06-09 | Delmag Maschinenfabrik Reinhold Dornfeld Gmbh & Co. | Boring tool |
| US6543533B2 (en) | 2001-03-02 | 2003-04-08 | Duhn Oil Tool, Inc. | Well tubing rotator |
| CN102333934A (zh) * | 2009-02-26 | 2012-01-25 | 西部钻探产品有限公司 | 用于在钻孔中抽出和插入钻管柱的方法及实施该方法时所用的设备 |
| CN109882096A (zh) * | 2019-01-16 | 2019-06-14 | 中煤科工集团西安研究院有限公司 | 一种卡爪式送水器及其施工方法 |
| US20250137339A1 (en) * | 2023-10-26 | 2025-05-01 | Saudi Arabian Oil Company | Methods and apparatus for retrieving a wireline using a release sub |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4102414A (en) * | 1976-08-09 | 1978-07-25 | Joy Manufacturing Company | Drilling apparatus |
| FI65470C (fi) * | 1982-08-27 | 1984-05-10 | Tampella Oy Ab | Muffspaerr foer en skarvstaongsborrningsanordning |
| US4981180A (en) * | 1989-07-14 | 1991-01-01 | National-Oilwell | Positive lock of a drive assembly |
| GB2265647A (en) * | 1992-04-04 | 1993-10-06 | Compair Holman Ltd | A drive coupling device for a longitudinally displaceable rotatable drive member |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3190370A (en) * | 1961-04-17 | 1965-06-22 | Atlas Copco Ab | Drive and feed device for a string of rotary drill string elements |
| US3239016A (en) * | 1963-05-27 | 1966-03-08 | George E Failing Company | Drill pipe sections and method of and apparatus for automatically breaking out the connections thereof |
| US3291225A (en) * | 1964-07-03 | 1966-12-13 | Gardner Denver Co | Drive coupling for drill string |
| US3722603A (en) * | 1971-09-16 | 1973-03-27 | Brown Oil Tools | Well drilling apparatus |
| US3768579A (en) * | 1971-12-27 | 1973-10-30 | Robbins Co | Drill pipe breakout mechanism |
-
1973
- 1973-12-26 US US00427488A patent/US3851714A/en not_active Expired - Lifetime
-
1974
- 1974-12-04 CA CA215,222A patent/CA997750A/en not_active Expired
- 1974-12-19 ZA ZA00748091A patent/ZA748091B/xx unknown
- 1974-12-20 SE SE7416155A patent/SE412432B/xx unknown
- 1974-12-23 ES ES433283A patent/ES433283A1/es not_active Expired
- 1974-12-23 DE DE2461112A patent/DE2461112C3/de not_active Expired
- 1974-12-23 BR BR10732/74A patent/BR7410732D0/pt unknown
- 1974-12-23 BE BE151882A patent/BE823787A/xx not_active IP Right Cessation
- 1974-12-24 GB GB5569674A patent/GB1464149A/en not_active Expired
- 1974-12-26 AR AR257078A patent/AR217613A1/es active
- 1974-12-26 FR FR7442903A patent/FR2256308B1/fr not_active Expired
- 1974-12-26 JP JP14848474A patent/JPS5431721B2/ja not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3190370A (en) * | 1961-04-17 | 1965-06-22 | Atlas Copco Ab | Drive and feed device for a string of rotary drill string elements |
| US3239016A (en) * | 1963-05-27 | 1966-03-08 | George E Failing Company | Drill pipe sections and method of and apparatus for automatically breaking out the connections thereof |
| US3291225A (en) * | 1964-07-03 | 1966-12-13 | Gardner Denver Co | Drive coupling for drill string |
| US3722603A (en) * | 1971-09-16 | 1973-03-27 | Brown Oil Tools | Well drilling apparatus |
| US3768579A (en) * | 1971-12-27 | 1973-10-30 | Robbins Co | Drill pipe breakout mechanism |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4114698A (en) * | 1975-02-20 | 1978-09-19 | Smith International, Inc. | Method and apparatus for tunneling upwardly |
| US4194579A (en) * | 1976-08-09 | 1980-03-25 | Joy Manufacturing Company | Drilling apparatus and method |
| US4147215A (en) * | 1978-03-09 | 1979-04-03 | Hughes Tool Company | Independently powered breakout apparatus and method for a sectional drill string |
| US4239083A (en) * | 1979-05-07 | 1980-12-16 | Baker International Corporation | Method and apparatus for rotating tubing conduits |
| US4373584A (en) * | 1979-05-07 | 1983-02-15 | Baker International Corporation | Single trip tubing hanger assembly |
| US4391331A (en) * | 1979-08-10 | 1983-07-05 | Constructors John Brown Limited | Guides for use in forming pipe connections and a process of forming pipe connections |
| DE3324334A1 (de) * | 1982-07-07 | 1984-01-12 | Osakeyhtiö Tampella AB, 33100 Tampere | Oeffnungsvorrichtung fuer eine bohrstange einer bohranlage mit verlaengerbarer bohrstange |
| FR2588914A1 (fr) * | 1985-10-22 | 1987-04-24 | Tampella Oy Ab | Dispositif d'ouverture pour tiges de forage |
| DE3635377A1 (de) * | 1985-10-22 | 1987-04-23 | Tampella Oy Ab | Bohrgeraet fuer lange bohrungen |
| US4721171A (en) * | 1985-10-22 | 1988-01-26 | Oy Tampella Ab | Opening device for drill rods for an extension rod drilling equipment |
| EP0595439A3 (de) * | 1992-10-29 | 1995-05-31 | Charles Machine Works | Aufbrechvorrichtung für Bohrgestänge. |
| US5762148A (en) * | 1995-04-01 | 1998-06-09 | Delmag Maschinenfabrik Reinhold Dornfeld Gmbh & Co. | Boring tool |
| US6543533B2 (en) | 2001-03-02 | 2003-04-08 | Duhn Oil Tool, Inc. | Well tubing rotator |
| CN102333934A (zh) * | 2009-02-26 | 2012-01-25 | 西部钻探产品有限公司 | 用于在钻孔中抽出和插入钻管柱的方法及实施该方法时所用的设备 |
| CN102333934B (zh) * | 2009-02-26 | 2014-07-23 | 西部钻探产品有限公司 | 用于在钻孔中抽出和插入钻管柱的方法及实施该方法时所用的设备 |
| CN109882096A (zh) * | 2019-01-16 | 2019-06-14 | 中煤科工集团西安研究院有限公司 | 一种卡爪式送水器及其施工方法 |
| CN109882096B (zh) * | 2019-01-16 | 2021-04-20 | 中煤科工集团西安研究院有限公司 | 一种卡爪式送水器及其施工方法 |
| US20250137339A1 (en) * | 2023-10-26 | 2025-05-01 | Saudi Arabian Oil Company | Methods and apparatus for retrieving a wireline using a release sub |
| US12305463B2 (en) * | 2023-10-26 | 2025-05-20 | Saudi Arabian Oil Company | Methods and apparatus for retrieving a wireline using a release sub |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2256308A1 (de) | 1975-07-25 |
| GB1464149A (en) | 1977-02-09 |
| JPS50114303A (de) | 1975-09-08 |
| FR2256308B1 (de) | 1982-05-28 |
| JPS5431721B2 (de) | 1979-10-09 |
| ES433283A1 (es) | 1977-03-01 |
| DE2461112B2 (de) | 1979-01-18 |
| BR7410732D0 (pt) | 1975-09-02 |
| AR217613A1 (es) | 1980-04-15 |
| CA997750A (en) | 1976-09-28 |
| SE7416155L (de) | 1975-06-27 |
| DE2461112A1 (de) | 1975-07-10 |
| ZA748091B (en) | 1976-01-28 |
| DE2461112C3 (de) | 1979-09-13 |
| SE412432B (sv) | 1980-03-03 |
| AU7676274A (en) | 1976-06-24 |
| BE823787A (fr) | 1975-06-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: SANDVIK ROCK TOOLS, INC., 1000 INDUSTRIAL PARK ROA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TRW INC., A CORP. OF OH;REEL/FRAME:004967/0306 Effective date: 19881014 Owner name: SANDVIK ROCK TOOLS, INC., VIRGINIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TRW INC., A CORP. OF OH;REEL/FRAME:004967/0306 Effective date: 19881014 |
|
| STCF | Information on status: patent grant |
Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES) |
|
| AS | Assignment |
Owner name: CUBEX LIMITED A CANADIAN CORPORATION, CANADA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SANDVIK ROCK TOOLS, INC., A CORP. OF DE;REEL/FRAME:005697/0337 Effective date: 19910412 |