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Publication numberUS2783971 A
Publication typeGrant
Publication dateMar 5, 1957
Filing dateMar 11, 1953
Priority dateMar 11, 1953
Publication numberUS 2783971 A, US 2783971A, US-A-2783971, US2783971 A, US2783971A
InventorsBaker Buford M, Carle Guy F
Original AssigneeEngineering Lab Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Apparatus for earth boring with pressurized air
US 2783971 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

March 5, 1957 e. F. CARLE EI'AL 2,783,971



APPARATUS FOR EARTH BORING WITH PRESSURIZED AIR Filed March 11,- 1953 7 Sheets-Sheet 4 I70 I78 I85 I72 l72-A 172-8 INVENTORS GUY F. CARLE & BYBJM. BAKER AG E Mud! 1957 e. F. CARLE EI'AL 2,783,971



1957 e. F. CARLE ETAL 2,783,971

APPARATUS FOR EARTH BORING WITH PRESSURIZED AIR Filed March 11,- 1953 7 Sheets-Sheet '7 17F" 23l 230 82A INVENTOR I GUY F CARLE I BY & B M BAKER 1A. ,ao w

AGENT rosit 'c United States Patent ....l i..,.. .r. an mp3 APPARATUS FOR EARTHBORING. WITH PRESSURIZED AIR This invention relates to the art of earth boring and more] particularly to drilling holes throughldirt, i'ock'bi' other formations for water wells, oil etiploratiomwb and holes for blas n either verticalor hhrizontal, 'or for other purposes. i

The primary object of this inyention is to provide a rotary method and apparatus for earth boring utilizes pressuriged air to rotate the drill bit in'theh by n a r mot r c t n a th b tttap e B51? jacent the drill. r A other o j s to Pr vid t q, a ,ap at a for r l h'qles whe e n p ii' viie a is ou rotate thedr ill bit, cool the bearings, and iitishhutm t rial' om h to npf he h le-L A st turthe fibi c .O thi nv st eais t p e ude, a relatively n tubu a r mo or pil s'e r l n ,bio e holes whereby the air motor is directly nser becomesa part of the string ofdrill pipe. L

'Yet another object is to provide a longitudinal air motor for rotary drilling which receiyes its ai pply axia ly hro gh't e m s n 'a 'cn fllqn i s. Q6 35 a ter expan ng a po t n of theen i v i 111 r 9 pellsit through'the other end in a rariiiedand co dition for cooling the drill bit spindle b gs, he flalpressure of the air being suchlthatsuifieient p" t re remains afterturning the air motor to carry 'gs back up the borehole to the surface.

A st further objec i to pr 'yide a nle hoq an apparatus of drilling holes which is truck mounted and wherein the drivermay'remain in thetrucl; and proceed to th'location and drill one or more holes as required in. Oi U plcration work without ever getting "out of the cab.

Other objects and advantages of theinvention'willjbecome apparent from the following descriptionf'and'for'the purposes ofillustration, but not of limitation, anem ment of the invention is shown inthe laccompanyin ings in which: i i v Fig. 1 represents a side elevational view of the complete mobile drilling rig of this invention wi'th thedrilling iiriit in transport and/or horizontal drilling. position.

Fig. 2 represents a side elevationalview oflthemobile drilling rig with the drilling unit in a vertical position preparatory to commencing the drilling operation.

Fig. 3 represents a side elevational view, partially in section of the drilling unit with the drill stem in its raised andlocked position.

Fig. 4 is a front elevational view of the drilling unit shown in Fig. 3 except here the drill stem isin'its operating FiglS .is a cross section of the drill stern taken about 65 the line 5 5 of Eig. 3. i

Fig, 6 is a detail plan viewof the bottom plate sa es o l ia ia,3- 5' Fig. 7 isf'a'detail planyiew of thetop plafte of the drill vcagt Shown i, 1Fig l I Fig. 8,is acro sssectipnal view. of the motor talr en .alongtheline 8- SOfFigLQ.

hr the ice Fig. 9 is a sectional elevational view of the drill motor of this invention.

" Fig. 10 is a sectional elevational view of the drill bit detached from the drill motor.

' Fig. 11 is a bottom view of the drillbit of Fig. 10, but with cutters and spindles removed.

Fig. 12 is a detail fragmentary view of the bottom plate and rear uprights showing the hold down lock of the drill cage.

'Fig. 13 is adetail fragmentary view of the top plate and rear uprights showing the up position lock of the drill cage.

Fig: '14' is a diagrammatic view of the cablereevingand movements involved when lowering the drill vcage froin the position shown in Fig. 1, and iirmoving the drill stem horizontally. r Fig. 15 "is a diagrammatic view of the cable reeving and movements involved in raising the drill cage from the position'shown in Fig. 2, and in moving the drill stem vertically. t

' v Fig. 16 is a fragmentary elevational view of a drillingrig of this invention employing a special cab.

' Fig. 17 is a fragmentary plan view of the rig shown vin I Fig. 16 in partial section about the line 1717.

Referring now more particularly to the'charact ers of reference on the drawing, the complete mobile drilli'ng rig bf'this invention is seenin Figs.' 1 and 2 toconsistba'sically ofacoiiventiona'l' truck chassisZ including at least four wheels 3,21, frame 4 and cab 5; and a drilling unit'dat tziche'd b," theifrafm e ahead of the cab 5, andai1 aircompr set 7' mounted 'at'th'e jrear'fo'f the cab'and separately powered or driven by apower take-off (not shown) from the truckengine,ifdesired.

The drilling unit 6 is supported from a platform 10 which'is rigidlyatta-ched to the frame 4 and includes vertical members'll and braces 12 as seen in Fig. 3.

Top and bottom plates 14 and '15 are connected by bolts 16 which include shoulders 17 whereby'the' plates and bolts form a sturdy rigid cage 18 for guiding and supporting the nonrotatable drill pipe 20 as will" be shown. Top plate l4 includes a vertical 'bore lllwith a tapered section 22 for reception of and guiding fordrill pipe 20, and a horizontal bore 23 for insertion of pivot pin 24. Bottom P at .15 udes a e t a ba s 5 i ss s o the/drill stem 'and includes horizontal pins 26'and"27 onwhich are mounted latch 30 and sheave -31respectively. Plate 15 also includes lips 32 which guide plate 15 by vertical members 11 and preventsidewiselateral movement of drill cage/ 18 when the unit is in vertical operation. A

bracket 33 attaehes to plate 15 adjacent latchv30, and

spring 34 urges latch 30 into engagement with notch 35 of "non-rotata'bldrill pipe 20 When'the latter is in its raised and locked position (Fig. 3). Latch 30 may be released by apull on line 36 from a level-'37 in the cab 5. Drill pipe Zlllineludes a groove 40 which acts as a combination cable guide "and keyway, and the lower end of this stern terminates in a threaded pin 41 for connection with threads 28 of drill motor 38, which is' attached by threads 29 to drill bit'39. Near the upper'an'd lower ends of the drill stem are, cable anchors 42 and 43 respectively, and a central bore 44 provides an air passage through the stern.

Lower plate 15 includes an"in wafrd projecting key 45 which cooperates with groove 40, as "do sheaves :46 and 47 supported from plate 15 by vertical arms 48 and pins 49. Sheave 51 is mounted incut out 52 centrally of top plate 14 and includes two grooves 53 and 54 receive lift and lower cable leads 55 and 56 respectively which are oppositely wound on power winch 57. Line pulley 58 is alsojournalled to shaft 24 andis located in cut-out 59"oftOPfpl ate'l l. Sheav'e 31is'l-ocated in cut-out 60 of plate-15am is jouirnallcd on shaft 27 which is inserted plate'l S. R eferringt'o l ligs.'5', 6 'and'7,

the relationship between the sheaves and their supporting plates may be seen.

By reference to Fig. 4 the operation of line 36 in releasing latch 30 may be observed. A second line pulley 61 is supported from vertical bolt 16 at a position whereby line 36 passing thereover will be substantially horizontal relative to the offset arm 66 of latch 30. Since the center line of pulley 58 coincides with the centerline of the pivoting action of cage 18, no allowance is required for extension of line 36 to allow for increased length when cage 18 is in its raised position.

The compressor 7 includes an air storage bottle 62 which connects by way of flexible hose 63 to air fitting 64 at the top of drill pipe 20. Hose 63 is supported intermediate its length by bracket 65.

Winch 57 is powered from the truck engine by any convenient means such as chain drive, power take-off, or electric motor. Cable lead 55 is wrapped counterclockwise (when viewed in Fig. 3), and acts to lift drill stem 20, by means of the following reeving: cable 55 passes upwardly from winch 56 to and around one groove 53 of sheave 51 and down and around sheave 31 and 78 and after performing work passes through the exhaust side of the drill motor as indicated by arrows 79. The now cool and expanded air indicated by arrow 80 passes axially through bit 39 to blast out cuttings in the bottom of the hole and return upward (arrows 81) carrying the cuttings with it until they strike deflector 82 which causes the cuttings to follow the curvature of the deflector in the path shown by arrow 83 and build up at pile 84. At the point where air as represented by arrow 80 passes downward through the drill bit 39 for flushing purposes, other paths are provided for air streams as represented by arrows 85 to cool the bearings of bit 39 with the now expanded and cooled air stream. Additionally the bearings may be lubricated as well as cooled by the addition of an atomized spray or drops of oil into the air stream. When the hole 76 has reached the desired depth, the operator shuts 011 the air supply and enover sheave 47 to anchor 43 at the lower end of the nonrotary drill pipe 20. Cable lead 56 is wrapped clockwise about winch 57, and this lead may be used to apply down pressure to drill bit 39 through the following reeving: cable 56 passes up and over a second groove 54 of sheave 51 from winch 57 and thence down and about sheave 46 and upward to anchor 42 near the top of drill pipe 20.

When drill cage 18 and pipe 20 are in the vertical or drilling position a spring actuated hold down lock 68 engages a lug 69 on bottom plate 15 to keep the drilling unit 6 rigid relative to truck'2. Fig. 12 shows the path 70 which lug 69 follows when cage 18 is lowered to its vertical position. When lug 69 strikes the tapered surface 71 it extends spring 72 and raises lock 68 sufiiciently to permit lug 69 to pass by surface 71 and to the position shown, whereat spring 72 retracts lock 68 to grasp lug 69 and hold plate 15 securely to upright 11. Line 73 leads from the top of lock 68 to lever 74 inside the cab 5 to permit release of lock 68 prior to raising cage 18 to travel position.

Operation When a drill site is selected, the operator may drive truck 2 toward the selected site with attached drilling unit 6 in travelling position as shown in Fig. 1. Upon arrival at the drill site, the drilling unit 6 is lowered to the postion shown in Fig. 2, by rotating the winch 57 in clockwise direction. Since latch 30 is closed when the unit 6 is in travelling position, a downward pull applied by cable 56 to anchor 42 will not pull drill pipe 20 down but rather will cause the entire unit 6 to totate about pivot 24 until it reaches its vertical position at which point cage lock 68 automatically engages lug 69 to hold cage 18 in rigid vertical position during drillmg.

With the truck 2 braked in position shown in Fig. 2, the air compressor 7 is placed in operation to supply pressurized air to bottle 62 and the through line 63 and fitting 64 to the central bore 44 running through stationary drill pipe 20 to drill motor 38 and drill bit 29 which the pressurized air rotates in a manner to be hereinafter described. With the motor and bit thus rotating the operator moves lever 36 to release latch 30 and then rotates winch 57' in a clockwise direction to apply a downward pull on pipe 20 through cable 56 and anchor 42. Drill bit 39 will commence to dig when it contacts the surface of the earth 75 and will. continue to dig downward due to the down pressure exerted by winch 57 and the weight of drill pipe 20 until a hole 76 of the desired depth has been excavated. The pressurized air I represented by broken arrow 77 of Fig. 4 enters the pressure side of the drill motor 38 as indicated by arrows gages a control (not shown) in cab 5 to rotate Winch 57 in a counter-clockwise direction to reel in cable 55 and thus apply a lifting force through anchor 43 to drill pipe 20 to raise the entire drill stem out of the hole 46 to a height suflicient to permit latch 30 to engage notch 35 and lock the drill stem 85 in its up position. At this point the complete mobile drill rig may be moved to adjacent drill sites and the drilling operation may begin again. If, however, there is no further drilling in the immediate area, then the lock 68 is released by the operator by a pull on lever 74 and line 73, so that continued rotation of winch 57 will raise cage 18 and drill tor 38 consists basically of a cylindrical tube enclosing a longitudinal rotor 101 of a substantial length supported within the tube by upper and lower bearings 102 and 103 respectively; upper and lower ends of tube 100 terminate at tubular boxes 104 and 105 which connect to the drill pipe 20. Cavity 106 is connected to an arcuate slot 107 in bearing mount 108 through holes 109 and circular passage 110 which slot delivers pressurized air to annular intake chamber 111. Bearing mount 108 includes threads 117 which engage threads 118 of box 104 which are tightened to compress fabric shim 119 to provide an air seal between the mount and box at engagement. A generally cylindrical shell 112 extends longitudinally but not concentrically through the tube 100 beyond the active length of rotor 101. Intermediate its length shell 112 includes a circumferential proiection 113 including a groove 114 for reception of an O ring 115. It should be noted that shell 112 is olfset from the center of rotor 101 to provide aneccentrio rotor chamber 116 and offset from tube 100 so as to provide a relatively large annular section for intake chamber 111 on one side of tube 100. and a very small annular section at the opposite side. Similarly proiection 113 is offset relative to shell 110 so that it completely fills the annular chamber 111 and O ring and seals the lower end of the intake chamber 111 and provides a second longitudinal annular chamber which becomes the exhaust chamber 120. Adiacent the large section of the intake chamber 111, shell 112 is drilled with a series of holes or ports 121. Rotor 101, being oifset radially in shell 112. touches the shell at point iust to one side of ports 121. Blades 122 are spring loaded within slots 123 by compression springs 124 so that they ex and from their minimum volume position at the point 125 of rotor and shell contact to their maximum volumeposition at point 126. When pressurized air enters ports 121 it expands and forces blade 122 and rotor 101 in a clockwise direction until the blade 122 passes point 126, after which blade 122 forces the air ahead out exhaust ports 127 and through exhaust slot 128 in bearing mount 129-at the l wer end. of air motor 38.

h per end, at atgtor 101 istformed as a neck which serves as auto rig for the inner race 131 of bearing 102. The outerrace 132 is mounted in annular shaped mount 108. The lower end 133 of box 104 retains the outer.race 132 in place by compressing the opposite end of. thefout'er races 132,

is a lock type device which p,reven :ts nut135from work- T ing loose and permits the nut and rotor 101 to rotate simultaneously with inner bearing. race 131. The top bearing102-A is exposed to the incoming blast of air from cavity 106 and consequently permits passage of air vertically down through all the top"bearingsf102 and. through radial passages to. intake chamber 111 .thereby providing a means for cooling the bearings. The lower bearings are cooled similarly by a jet of airlen'tering through radial passage 146 in shell 112 and mount1129. The lower end of bearings 103.. is open to channel 1.47 and these bearings are held in place by retaining ring 148. Neck 150 projecting from the lower end of rotor 101 is splined as at 151 and engages matching spline 152 in lower box 105 to impart rotary motion to box 105 and attached drill bit 39. A pin 153 passes through aligned holes 154 and 155 in the neck 150 and box 105 respectively to secure the drill motor 38 and drill bit 39 against relative axial movement. Longitudinal passages 156 connect channel 147 to cavity 157 which opens directly into the central opening 158 of drill bit 39. The lower rim 159 of tube 100 overlaps undercut 160 of box 105 to provide a relatively air tight rotary seal between tube 100 and box 105.

Referring to Fig. 10 the construction and operation of the drill bit per se may be observed. The complete bit 39 is seen to consist basically of a shank including a tapered threaded pin 171 and three forks 172 each including a spindle 173 which is welded thereto as at 174, and a cutter cone 175 journalled thereto. Tines 172A and 172-B of forks 172 are connected by a flat land 176 and together therewith form a cavity 178 for reception of lip 177 of spindle 173. Spindle shaft 179 includes a race 180 which together with cooperating race 181 defines a raceway 182 for reception of balls 183 which are loaded at assembly through loading track 184. Since this is an air course bit, certain channels are necessary therethrough to introduce air to raceway 182; a channel 185 is drilled in shank 170 and at an angle to central opening 158 and in alignment with channel 186 in spindle 173 which leads to raceway 182. In order to prevent leakage of air between surfaces 176 and 177, a hollow insert 137 having shoulder 188 is placed at assembly in the space 189 between said surfaces. The partially expended air from drill motor 38 after entering cavity 157 enters central opening 158 as indicated at arrow 80. As the air stream passes channel 185 a portion of the air (arrow 85) enters the channel and passes through insert 187 and channel 186 to raceway 182, and after passing around the raceway and balls 183 it passes through clearance 194 between the spindle 173 and cutter 175 to rejoin the air stream 81 going back up the hole 76 to carry the cuttings to the surface. A particular advantage in using the partially expanded exhaust air 80 of air motor 38 to cool air motor bearings 103 and drill bit bearings 183 is that compressed air cools rapidly upon expansion and is much cooler than ambient air and therefore capable of carrying away more heat from the bearings than would be possible using atmospheric air or compressed air. t

In Fig. 14 a detailed schematic sequence of cable operation may be .obserfged P1P. jnii hi 'pb i bfl eat r;

as "required in some excavation operations; is anti :1 sepa atela qhlfi sis t qu edtoma nt iqthi t lttf i at 00 S ii t t 3. 1 tibal y latch ab LPii MiQf'Pl E I4,

5. .Withi, latch 39 is ltenizag idthc' are "d ack t i ih rizbntal t t qu h clockwise rotation of winch 57 as represented by arrow 207-A. With latch 30 released and latch 68 engaged the pipe 20 may be raised or lowered relative to its vertical axis by the operation shown diagrammatically in Fig. 15. When winch 57 is rotated clockwise (arrow 206A) cable 56 is reeled in, and through upper anchor 42 causes pipe 20 to move down (into hole 76) as indicated by arrow 205-A; when winch 57 is rotated counterclockwise (arrow 207-A) cable 55 is reeled in, and through lower anchor 43 raises pipe 20 up (out of hole 76) as indicated by arrow 208-A.

A cab-over type truck shown in Figs. 16 and 17 may be used in place of the conventional truck (Figs. 1 and 2) for further improved operation. The truck chassis represented by numeral 220 includes a special cab 221 with an inwardly inclined windshield 222 and a downwardly tapered front panel 223. A separate upper section 224 of the windshield is tinted to permit increased vision without glare. Winch 5'7-A is driven by means of gear box 225 which in turn is driven by a power take-off shaft 226 extending forward from engine 227. Gear box 225 is supported by cross piece 228 which is attached to longitudinal runners 229 to become part of the frame 4A. The cage 18-A is virtually identical to that shown in Fig. 3, and the shield 82-A is shown attached to cage 18-A by means of brackets 230 and capscrews 231. Vertical members 11-A upstand from runners 229 and are reinforced by braces 12-A to form a frame to pivotally support the cage 18-A and drill stem 85A. Winch 57-A is set as far rearward as possible to provide a clear field of vision as represented by line 232 between the operator and the drill bit 39-A so that the hole 233 to be drilled may be accurately located. The remaining structure of the rig in Figs. 16 and 17 corresponds to that previously described. By using a cab-over type truck and rig it is possible for the operator to drill a series of shallow shot holes in a predetermined pattern for seismic operations without ever having to get out of the cab. This feature is especially advantageous when operating in cold or inclement weather, not only from the standpoint of comfort to the operator but also from the standpoint of increased speed and efiiciency of operation.

From the foregoing description it will be readily seen that there has been produced a device and process as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of this invention, still in practice suoh deviations from such detail may be resorted to as do not form a departure from the spirit of the invention as defined in the appended claims.

Having thus described the invention, what is claimed as new and useful and is'desired to be secured by Letters Patent is:

A drilling unit comprising: a drill stem, means to support said drill stem for longitudinal movement, a source of pressurized air; said drill stem including a non-rotary drill pipe, a rotary air motor, and a drill bit in close proximity to said motor; a central bore through said drill pipe, means to introduce pressurized air into said bore, an air intake side and air exhaust side on said drill motor, said intake air side adapted to receive pressurized air, said exhaust side adapted to exhaust expanded and cooled air, a vane type rotor extending axially in said air motor attaching to said drill pipe, a stationary upper box on said motor connecting said bore and intake side, a stationary shell extending longitudinally but non-com centrically in surrounding relation to said rotor to form an air chamber therebetween, said vanes cooperating with said shell to form an air tight sliding fit with said shell when moving through said air chamber, a stationary tube extending from said upper box in longitudinal and concentric relation to said rotor, a lower box attached to said rotor for rotation therewith, said stationary tube engaging said lower box ina close sliding fit, a drill bit including bearings attached to said box, cutter cones on said bearings, a central opening extending through said bit to the vicinity of said cutter cones, an air passage longitudinally through said box and connecting said central opening, an air path connecting said central opening and said bearings whereby air is adapted to enter said intake side, rotate said rotor, pass through said air passage and central opening to said cutter cones as expanded and cooled air, a portion of the air passing through said air path to cool said bearings.

References Cited in the file of this patent UNITED STATES PATENTS 307,606 Westinghouse Nov. 4, 1884 1,390,025 Drake Sept. 6, 1921 1,484,065 Gould Feb. 19, 1924 2,340,738 Dilley Feb. 1, 1944 2,401,190 Reynolds May 28, 1946 2,410,959. Brown Nov. 12, 1946 2,575,524 Mitchell Nov. 20, 1951 2,594,098 Vanderzee Apr. 22, 1952 2,661,932 Woods Dec. 8, 1953

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2915285 *May 23, 1956Dec 1, 1959Jersey Prod Res CoCoring subterranean formations
US2967577 *Aug 2, 1957Jan 10, 1961Wladimir TiraspolskyTurbines for the actuation of drills
US3012618 *Sep 25, 1958Dec 12, 1961Hoagland Daniel AFluid actuated drill
US3058533 *Nov 4, 1958Oct 16, 1962Collins Jr Hight MMachine for installing and removing poles
US3076514 *Dec 1, 1958Feb 5, 1963Empire Oil Tool CoDeep well motor drill
US3088529 *Sep 23, 1957May 7, 1963CullenFluid-driven engine
US3125174 *Feb 9, 1961Mar 17, 1964 figure
US3159222 *Sep 30, 1958Dec 1, 1964Dresser IndTurbodrill
US3464506 *Jun 27, 1968Sep 2, 1969Reserve Mining CoBlower system for jet piercers
US3717205 *Jan 27, 1971Feb 20, 1973Kenting Drilling LtdDraw works for drilling rig
US3924695 *Oct 2, 1974Dec 9, 1975Kennedy John RRotary drilling method and apparatus
US5803187 *Aug 23, 1996Sep 8, 1998Javins; Brooks H.Rotary-percussion drill apparatus and method
US7500528 *Apr 21, 2006Mar 10, 2009Shell Oil CompanyLow temperature barrier wellbores formed using water flushing
US7527094Apr 21, 2006May 5, 2009Shell Oil CompanyDouble barrier system for an in situ conversion process
US7546873Apr 21, 2006Jun 16, 2009Shell Oil CompanyLow temperature barriers for use with in situ processes
US7549470Oct 20, 2006Jun 23, 2009Shell Oil CompanySolution mining and heating by oxidation for treating hydrocarbon containing formations
US7575053Apr 21, 2006Aug 18, 2009Shell Oil CompanyLow temperature monitoring system for subsurface barriers
US7735935Jun 1, 2007Jun 15, 2010Shell Oil CompanyIn situ thermal processing of an oil shale formation containing carbonate minerals
US20070108200 *Apr 21, 2006May 17, 2007Mckinzie Billy J IiLow temperature barrier wellbores formed using water flushing
US20070131415 *Oct 20, 2006Jun 14, 2007Vinegar Harold JSolution mining and heating by oxidation for treating hydrocarbon containing formations
US20070137856 *Apr 21, 2006Jun 21, 2007Mckinzie Billy JDouble barrier system for an in situ conversion process
US20070144732 *Apr 21, 2006Jun 28, 2007Kim Dong SLow temperature barriers for use with in situ processes
DE2752768A1 *Nov 25, 1977May 31, 1979Inst Burovoi TekhnikTurbine drill - with separate bearing set for each rotor carrying shaft section
WO1998007951A1Aug 25, 1997Feb 26, 1998Javins Brooks HRotary-percussion drill apparatus and method
WO2009031963A1 *Sep 6, 2008Mar 12, 2009Svenska Maskin Och Tryckluft I Bålsta AbA device preferably for performing of a drilling in earth-layer and rock
U.S. Classification175/103, 173/28, 173/73, 175/337, 175/17, 173/147, 175/88, 173/27, 175/212, 175/107, 175/339
International ClassificationE21B19/084, E21B19/00, E21B21/00, E21B4/00, E21B7/02, E21B21/16, E21B4/02
Cooperative ClassificationE21B7/02, E21B21/16, E21B19/084, E21B4/02
European ClassificationE21B19/084, E21B7/02, E21B4/02, E21B21/16