US3773121A - Reaction minimized earth boring - Google Patents

Reaction minimized earth boring Download PDF

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Publication number
US3773121A
US3773121A US00192217A US3773121DA US3773121A US 3773121 A US3773121 A US 3773121A US 00192217 A US00192217 A US 00192217A US 3773121D A US3773121D A US 3773121DA US 3773121 A US3773121 A US 3773121A
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Prior art keywords
gears
cutters
machine
gear
earth boring
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Expired - Lifetime
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US00192217A
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English (en)
Inventor
N Ikeda
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Tone Boring Co Ltd
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Tone Boring Co Ltd
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Priority claimed from JP10253670A external-priority patent/JPS4919762B1/ja
Priority claimed from JP11442670A external-priority patent/JPS5027642B1/ja
Priority claimed from JP12957170A external-priority patent/JPS5027643B1/ja
Application filed by Tone Boring Co Ltd filed Critical Tone Boring Co Ltd
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Publication of US3773121A publication Critical patent/US3773121A/en
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    • 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
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/16—Plural down-hole drives, e.g. for combined percussion and rotary drilling; Drives for multi-bit drilling units

Definitions

  • the present invention relates to an earth boring method and machine and more particularly to such a method and machine in which reaction torque can be minimized.
  • This type of apparatus is advantageous in that the use of a long drilling pipe for transmitting power is not required and complicated ground equipment may be eliminated, however, it is accompanied with a new problem of supporting the motor with reduction gears against reaction torque.
  • An object of the present invention is to provide an machine which can effectively perform a novel boring method.
  • the above object can be accomplished by transmitting the output torque of at least one high-speed motor with a high reduction ratio to a plurality of cutters disposed at mechanically balanced positions so that the cutters are revolved about the axis of the boring machine while said cutters rotate about their own axes whereby the reaction moment acting on supporting means for the motor means can be substantially reduced.
  • the aforementioned operation of the present invention can well be performed by using an earth boring machine comprising at least one high speed motor secured to a central member, speed reduction means of a high speed reductIon ratio which is rotatable with resepct to said central member and adapted to be driven by said motor, said speed reduction means having a plurality of output ends, a plurality of cutters disposed at mechanically balanced positions, each of said cutters being connected to a respective one of the output ends of said speed reduction means, said cutters being revolvable about the axis of the machine and rotatable about their own axes.
  • a core breaker may be provided beneath said central member and rotated together with said plurality of cutters.
  • the aforementioned boring machine may include one or more submersible motors mounted on the body and the central member may be constituted as a double tube construction which can be used for feeding and scavenging water into and out of the hole being bored.
  • This type of machine can be used in an earth boring operation with boring water in which forced water circulation is performed.
  • water discharging nozzle means may be provided on the revolvable casing so that water is discharged under pressure toward each cutter, preferably the leading side thereof as viewed in the direction of the revolution of the cutters.
  • each cutter and its driving means may preferably be constituted as an interchangeable unit so that the dimensional capability ofthe machine may be readily changed by simply replacing the unit by another unit of a different dimension.
  • each cutter it is preferable to support each cutter by a driving shaft which is forwardly inclined in the direction of the revolution.
  • the cutting edges on the cutters are spaced apart from the bottom surface of the bore at the trailing side as seen in the direction of the revolution so that the boring performance of the machine can be further improved.
  • a thrust adjusting float disposed above the machine.
  • the buoyancy of the float may be adjusted as desired to maintain the thrust force acting on the cutters at a optimum value even when the property of the earth formationsvaries during boring operation.
  • FIG. 1 is a diagrarnmatical elevational view, partly in section, showing the general arrangement of a boring plant employing an earth boring machine in accordance with the present invention
  • FIG. 2 is an elevational view of one embodiment of the earth boring machine in accordance with the present invention, the machine being partially cut away in order to show the detail thereof;
  • FIG. 3 is a view similar to FIG. 2 but showing another embodiment of the present invention.
  • FIGS. 4 through 8 show in plan view several examples of cutter arrangements
  • FIG. 9 is a fragmentary sectional view showing the earth boring operation using the machine of the present invention.
  • H6. 10 shows a further embodiment of the machine in accordance with the present invention, in which each cutter and its driving means as an interchangeable unit;
  • FIG. 11 is a side elevation view of a cutter which is supported on a forwardly inclined shaft
  • FIG. 12 is a sectional view taken along the line XII- -XII in FIG. 11;
  • FIG. 13 is a side elevational view of a thrust adjucting float which may be used with the machine of the present invention.
  • FIG. 1 there is diagrammatically shown a machine which is used in a wet-type boring system.
  • the reference numeral (1) generally shows an earth boring machine embodying the present invention.
  • the machine (1) of the present invention is subjected to a very little reaction moment so that it is possible to eliminate a drilling pipe of a high torsional rigidity and suspend the whole machine by a thin-walled pipe, a hose or a chain (2) as shown in the drawing.
  • the machine is provided with driving means such as one or more submersible electrical or hydraulic motors which can be used into water.
  • driving means such as one or more submersible electrical or hydraulic motors which can be used into water.
  • the drawing shows an example in which a plurality of submersible electrical motors are mounted and supplied with power through an electric cable (3).
  • the cable (3) is continuously fed from a cable reel (9) as the boring operation proceeds.
  • a water supply hose (4) is provided for supplying boring water e.g. bentonite mud water which is discharged from the lower end of the machine (1) and scavenged through a discharging hose (5) carryig slime therewith.
  • compressed air may be supplied through an air supply hose (6) to form bubbles for facilitating the removal of the slime.
  • the reference numeral (I3) shows an air compressor provided for this purpose.
  • ground equipment such as a derrick (7) can be simple as compared with a conventional one.
  • the ground equipment is not required to include drive means for rotating and advancing a main drilling pipe, a power transmission mechanism, and bearing means therefor, but only required to include means for lifting the boring machine (I), such as an electrically operated chain block (8) mounted on the derrick ('7), for carrrying the chain (2) suspending the machine (1
  • the water since the water is passed through the hoses (d) and (5), it is possible to eliminate water swivels which have been required in a conventional boring apparatus driven by a drilling pipe.
  • suitable guide means (14) may be provided around the machine (I) for maintaining the straightness of the hole.
  • FIG. 2 there is shown an example of an earth boring machine having submerged type electric motors.
  • the machine which is comprises a body (100) including a central pipe (110) whichis constituted by an inner pipe (111) and an outer pipe (112) respectively connected to the water discharging hose (5) and the water supply hose (4).
  • the water supplied from the hose (4) is passed through the space between the inner and outer pipes (111) and (112), and discharged from nozzles (I41).
  • Compressed air is supplied through the air supply hose (6) at an intermediate portion of the inner pipe (111) for producing air bubbles which facilitate the removal of the slime through the water dischage hose (5).
  • the central pipe of double wall construction comprising the inner and outer pipes (111) and (112) is advantageous in that the pressurized water supplied from th ground can be discharged toward the cutting edges of each cutter to and make the water carry the slime into the double wall central pipe (110).
  • Submersible type high speed electric motors are supported on the central pipe (110). In the illustrated apparatus, two motors are used, however, it should of course be noted that any number of motors may be used in accordance with the present invention.
  • Each of the motors (120) includes an output shaft having a gear (I-l) secured thereto and meshing with a second gear (I-Z) which is rotatable about the axis of the central pipe (110).
  • the gear (l-2) is secured to a sleeve which is rotatably supported on the pipe (1 10).
  • the gears (Il) and (I-Z) constitute a first stage of speed reduction means.
  • Another gear or sun gear (II-1) is secured to the lower portion of the sleeve (13G).
  • the sun gear (II1) there are arranged a plurality of planetary gears (II-2) meshing with sun gear (II-1).
  • the planetary gears (II-2) are also in meshing engagement with internal gears (II-3) and (II-4).
  • the internal gear (II-3) has teeth which are slightly less in number than those of the internal gear (II-4).
  • the internal gear (II-3) is secured to a casing (14%) which is rotatable about the axis of the machine and rotatably supports the cutters.
  • the internal gear (II-4) is secured to a transmission member (150).
  • the planetary gears (ll-2) are freely revolvable along the annular spacing between the sun gear (Ii-l) and the internal gears (II-3) and (II-41) with means for preventing the planetary gears from displacement out of the spacing.
  • the gears (II-i (ll-2), (II-3) and (II-4) provide a second stage speed reduction means of a high speed reduction ratio.
  • the transmission member (150) carrying the internal gear (ll-4) also has a gear (III-1) mounted on the lower portion thereof for driving a second gear (Ill2) secured to the shaft of each cutter (160).
  • the gears (III-l) and (III-2) may also constitute a third stage speed reduction means, however, in the illustrated arrangement, they constitute a speed increasing means.
  • the gears may constitute a speed reduction means or a speed increasing means in accordance with the diameter of the hole to be bored.
  • the casing supporting the cutters (160) and the transmission member supporting the gears (II-4) and (III-1) are rotatable with respect to the body (100) having the double wall pipe (110) and the motors (120). Suitable sealing means may be provided between the body (100) and casing (140).
  • Two induction motors (three-phase, two-pole) having a rate output H of 11 KW ps) with input frequency of 50 Hz under the voltage of 200 V are used as the motors (120).
  • the synchronized speed of each motor (120) is 3,000 r.p.m.
  • the number of teeth on the gears (I-1) and (I-2) of the first stage speed reduction means are respectively 60 and 100 with the module of 3 mm.
  • the speed reduction ratio of the first stage is 1.66.
  • the gears (II-l), (IL-2), (II-3) and (11-4) are of a profile-shifted type and module of 5 mm, respectively having 60, 20, 100 and 102 teeth. In this particular arrangement, two gears (II-2) are used. Thus, the speed reduction ratio of the second stage speed reduction means is about 136.
  • the third stage may be a speed reduction means, however, in this particular case, the gears (III-1) and (Ill-2) is module of 5 mm and respectively have one hundred, and fifty teeth due to the dimensional relationship.
  • the third stage provides the speed ratio of 0.5 and serves as a speed increasing means.
  • the speed of the cutter can be calculated as follows:
  • the torque T transmitted to the cutter (160) with full load condition can be calculated as follows:
  • N represents the rotational speed (r.p.m.).
  • H represents the output power (ps). This value of torque is considered to be a suitable one for boring a relatively loose earth formation such as an aluvium or a diluvium.
  • reaction torque (T acting on the body (100) can be represented by the following equation in terms of the reaction torque (T of a motor and the reaction torque (T due to the bearing load on the motor shaft.
  • the machine (11) can be susepended by a chain (2) or the like without the risk of the cable (3) and the hoses (4), (5) and (6) being undesirably twisted or entangled.
  • FIG. 3 shows an example which includes a single motor.
  • the machine includes a submersible electric motor (120) which is specially designed so as to include a double wall pipe passing through the center thereof.
  • a motor casing having a stator (121) is secured to the double wall pipe (110).
  • the rotor (122) of the motor is directly connected to a member corresponding to the sleeve in FIG. 2.
  • the first stage speed reduction means as provided in the arrangement of FIG. 2 is eliminated, but the whole function of the machine is the same as in FIG. 2.
  • the motor is of a special design in which a double wall pipe is passed therethrough, however, it is of course possible to use a conventional motor.
  • FIGS. 4 through 8 diagrammatically show examples of arrangements in which a plurality of cutters are disposed in mechanically balanced positions.
  • FIG. 4 is an example in which three cutters of the same diameter are located at circumferentially equi-distant positions.
  • Each of the cutters (160) rotates about its own axis in the direction shown by the arrow (P) and also revolves about the axis of the machine (1) in the direction shown by the arrow (O) which is opposite to the arrow (P).
  • the cutter (160) rotates about its own axis while revolving about the axis of the machine in the direction opposite to the rotation therof, each of the cutting edges on the cutter (160) moves along a hypotrochoidal path.
  • FIGS. 5 and 6 show examples in which four cutters (160) are positioned on a circle co-axial to the apparatus.
  • the cutters (160) are disposed at circumferentially equi-distant positions, and this arrangement corresponds to the embodiments of FIG. 2.
  • the cutters are not at equi-distant positions but, in this arrangement, mechanical balance is also obtained.
  • FIG. 7 corresponds to the embodiment shown in FIG. 3 and includes two large cutters (160) and two small cutters (161), each of which rotates about its own axis in the direction of the arrow (P) and revolves about the axis of the machine in the direction of the arrow (Q) which is opposite to the arrow (P).
  • the large cutters (160) it is possible to dispose the large cutters (160) very closely together so that it is possible to bore a hole without leaving any great amount of soil of the center of the hole.
  • FIG. 8 six cutters (160) are arranged at circumferentially equi-distant positions.
  • a core breaker (170) may be provided directly beneath the central member (110) as shown in FIG. 9.
  • the core breaker (1'70) may be secured to a bracket (142) formed on the casing (140). With this arrangement, the core breaker (170) is rotated with the casing (140), so that the portion (R) can be effectively removed. In this case, the core breaker (170) is rotated in the direction of revolution due to the reaction torque. Therefore, it is not preferable to form an excessively large portion (R) since the portion absorbs substantial torque.
  • the core breaker (170) can be of any form other than that shown in FIG. 9.. Asshown in FIG. 2, when an earth boring machine having a double walled central pipe is used to bore through a relatively loose earth formation by a water boring method, it is necessary to take grave] or boulders on the hole bottom into the cebtral pipe and lift them upto the ground together with water containing slime. Therefore, it is preferable that the core breaker (170) has a sufiiciently large intake port (171) so that the inner pipe (111) can be of sufiicient diameter to prevent the large boulders from clogging in the pipe.
  • the machine should preferably be of such a construction that can break by boulder by an impact given by the rotation of the core breaker (170). According to the present invention, however, the machine has a tendency to push gravel and boulders into the wall of the hole, so that it is very unlikely that a large boulder is gathered around the intake port of the central pipe. Thus, even in an arrangement in which a plurality of cutters (166) are arranged along a circle, it is possible to remove all soils without leaving any unbroken core portion (R).
  • water may be discharged under pressure from the water discharge nozzle (141) toward the cutters (160), preferably the leading side thereof. Since the position of the nozzle (141) remains unchanged with respect to the corresponding cutter (160), the cutting edges at the leading side of each cutter are continuously cleaned.
  • FIG. shows another embodiment of the present invention.
  • the machine (1) has a plurality of cutter driving units (180), each comprising a cutter drive shaft (181), a gear (III-2) secured thereto and a casing (182) which is removabiy mounted to the casing and enclosing the drive shaft and the gear.
  • the cutter drive units (180) are removable from the casing (140).
  • the casing (182) of each drive unit (180) has a flange (183) which is adapted to be secured to the co-operating flange (142) formed on the casing (140).
  • the machine (1) of FIG. 10 is intended to make the cutter (I60) replaceable with another cutter of different size. According to the above arrangement, a wide variety of cutter drive units (180) can be used in a single earth boring machine. In FIG. 10, the phantom line (180) shows a cutter of larger dimension.
  • FIG. 10 illustrates an arrangement in which four units (180) are disposed at circumferentially equi-distant positions as in the arrangement of FIG. 5, however, it should be noted that various changes may be made in the arrangement of the units.
  • each of the cutters (160) has cutting edges on the outer periphery thereof and the axis (S) of the shaft (181) is forwardly inclined by an angle (9) with respect to a vertical line (V).
  • V vertical line
  • the cutting edges at the leading side of the cutter come in engagement with the bottom of the hole (H) but are apart therefrom at the trailing side of the cutter as shown by a gap (G).
  • the cutting edges on the cutter (160) intermittently come in contact with the hole bottom.
  • Screw gears have already beem known as a means for transmitting motion between a pair of offset shafts.
  • the screw gear transmits motion through a point contact so that it is not suitable for transmitting power.
  • a heavy load is applied on the motion transmitting mechanism and, for this reason, it is not suitable to use a screw gear.
  • a gear (HI-2) meshing with a gear (III-1) is provided with internal spline teeth (III-3) with which external spline teeth (Ill-4) are engaged.
  • the splines (HP-3) and (ill-4) are engaged with a gap as shown in FIG. 12.
  • the angle of inclination (6) may be less than preferably 2 to 3.
  • the machine (1) of the present invention can be suspended by a chain (2) as shown in FIG. 1.
  • the thrust force for downward feeding the machine can be provided by the weight of the machine itself.
  • weight means or the like may properly be added.
  • FIG. 13 shows an example of such an arrangement which includes an adjusting float (200) disposed above the boring machine (1) and suspended by a chain (2).
  • compressed air may be supplied through an air hose (202) into an air reservoir (201) whereby the water in the reservoir (201) is forced out through a water port (203), so that the buoyancy of the float is increased.
  • the thrust force of the machine is correspondingly reduced.
  • present invention provides a novel machine which is effective to perform the novel boring method and is particularly suitable for use in a boring operation through a relatively loose earth fonnations.
  • a reaction minimized earth boring machine comprising a sun gear mounted on a rotary sleeve rotatable about a central member and driven by a power source through said rotary sleeve; planetary gears engaging with said sun gear so as to rotate and revolve in relation to said sun gear; a first internal gear mounted on a revolution casing around said planetary gears to engage therewith, said revolution casing being rotatable about said central member; a second internal gear mounted on a transmission member around said planetary gears to engage therewith, said transmission member being rotatable about said central member, said first and second internal gears having a small difference in their number of teeth and engaging the same planetary gear; a central gear mounted on said transmission member coaxially to said second internal gear; and further gears respectively mounted on rotary shafts driving cutters borne rotatably by said revolution casing, said further gears engaging with said central gear.
  • central member comprises an inner pipe and an outer pipe, both pipes being disposed coaxially with each other and extending to a position adjacent the cutters.
  • An earth boring machine further comprising water-discharge nozzle means provided on a bracket formed on the revolution casing and connected to the space between the inner and outer pipes at the lower end thereof.

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  • 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)
US00192217A 1970-11-20 1971-10-26 Reaction minimized earth boring Expired - Lifetime US3773121A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP10253670A JPS4919762B1 (de) 1970-11-20 1970-11-20
JP11442670A JPS5027642B1 (de) 1970-12-18 1970-12-18
JP12957170A JPS5027643B1 (de) 1970-12-25 1970-12-25
JP12709970 1970-12-30

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US3773121A true US3773121A (en) 1973-11-20

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US00192217A Expired - Lifetime US3773121A (en) 1970-11-20 1971-10-26 Reaction minimized earth boring

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US (1) US3773121A (de)
DE (1) DE2157282C3 (de)
FR (1) FR2115264B1 (de)
GB (1) GB1371931A (de)
IT (1) IT944996B (de)

Cited By (20)

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US3894587A (en) * 1972-12-14 1975-07-15 Hydrosol Device for drilling in hard rock formation
US3907366A (en) * 1974-08-11 1975-09-23 David R Pender Method and apparatus for mining coal or other solids in flooded mines
US4133400A (en) * 1976-11-05 1979-01-09 Yamaha Hatsudoki Kabushiki Kaisha Snowmobile
US4185703A (en) * 1976-06-18 1980-01-29 Coyne & Bellier, Bureau d' ingenieurs Conseils Apparatus for producing deep boreholes
US4314615A (en) * 1980-05-28 1982-02-09 George Sodder, Jr. Self-propelled drilling head
US4971162A (en) * 1989-12-18 1990-11-20 Carl F. Back Continuous drill feed apparatus
US5497841A (en) * 1991-03-14 1996-03-12 William Mohlenhoff Methods for coring a masonry wall
US20030037464A1 (en) * 2000-03-13 2003-02-27 Gessay Jean Claude Drilling apparatus for hard ground
US20030074810A1 (en) * 2000-03-13 2003-04-24 Jean-Claude Gessay Drilling apparatus for hard ground
US20050229440A1 (en) * 2004-03-26 2005-10-20 Maximilian Arzberger Trench cutter
US20070023204A1 (en) * 2004-03-30 2007-02-01 Josef Mocivnik Method and device for drilling holes in soil or rock material
US20090022584A1 (en) * 2007-04-05 2009-01-22 Soilmec S.P.A. Pump for hydromill
US20090188722A1 (en) * 2006-08-23 2009-07-30 Teijo Hulkkonen Drilling device for drilling and reaming of a hole
US20090241383A1 (en) * 2008-04-01 2009-10-01 Ihc Holland Ie B.V. Suction Tube Device Provided with Drive Systems and Method of Repairing Same
US20120175140A1 (en) * 2009-07-03 2012-07-12 Joachim Hecht Hand-held power tool
CN103670264A (zh) * 2013-11-28 2014-03-26 江苏泰来减速机有限公司 一种双驱动同轴正反向输出螺旋入岩钻机
CN104863504A (zh) * 2015-06-05 2015-08-26 刘玉燕 X孔造孔机
CN106120941A (zh) * 2016-08-19 2016-11-16 天津海辰华环保科技股份有限公司 气动清淤泵滚轮式破土装置
CN106894759A (zh) * 2017-04-19 2017-06-27 中海石油(中国)有限公司 一种自升式钻井平台桩腿主动刺穿一钻多孔钻头及方法
BE1023852B1 (nl) * 2016-06-03 2017-08-14 GeoSea N.V. Inrichting en werkwijze voor het boren van een schacht met grote diameter in een ondergrond

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DE2845878C2 (de) * 1978-10-21 1983-01-20 Salzgitter Maschinen Und Anlagen Ag, 3320 Salzgitter Bohreinrichtung für Erdbohrungen
DE2931177C2 (de) * 1979-08-01 1982-02-18 Friedrich Wilhelm Paurat Verfahren und Vorrichtung zum Abteufen eines Gefrierschachtes
AU559303B2 (en) * 1983-03-24 1987-03-05 Coaltex Inc. Mining machine
US4790391A (en) * 1985-10-04 1988-12-13 Tone Boring Co., Ltd. Air pressure impact drilling method and apparatus for same
CN105804636B (zh) * 2016-05-06 2018-08-24 江苏盖亚环境科技股份有限公司 一种土壤取样修复一体钻机的多工位动力头安装机构

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US1574040A (en) * 1924-11-13 1926-02-23 Alfred W Lasher Drill
US2491908A (en) * 1945-08-11 1949-12-20 James E Roberts Earth drilling device
DE881484C (de) * 1944-03-28 1953-06-29 Salzgitter Maschinen Ag Bohrturbine
GB712913A (en) * 1951-08-27 1954-08-04 Alexander Vellan Improvements in and relating to earth boring apparatus
US3161243A (en) * 1960-07-22 1964-12-15 Frank F Davis Drilling system with plural below ground motors
US3181631A (en) * 1962-08-24 1965-05-04 Cameron And Jones Inc Counter-rotating earth drill
US3232362A (en) * 1963-11-12 1966-02-01 Cullen Well drilling apparatus
US3285351A (en) * 1962-08-06 1966-11-15 Michael R Caro Drilling apparatus
US3322466A (en) * 1963-12-30 1967-05-30 Gewerk Eisenhuette Westfalia Mining machine with concentric relatively variably rotated heads
US3431989A (en) * 1967-07-31 1969-03-11 Willis D Waterman Planetary excavator
US3509949A (en) * 1966-11-09 1970-05-05 Tone Boring Co Excavation of trenches for buried walls
US3556231A (en) * 1968-08-30 1971-01-19 Homer I Henderson Bit weight maintainer for marine earth boring

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Publication number Priority date Publication date Assignee Title
US1574040A (en) * 1924-11-13 1926-02-23 Alfred W Lasher Drill
DE881484C (de) * 1944-03-28 1953-06-29 Salzgitter Maschinen Ag Bohrturbine
US2491908A (en) * 1945-08-11 1949-12-20 James E Roberts Earth drilling device
GB712913A (en) * 1951-08-27 1954-08-04 Alexander Vellan Improvements in and relating to earth boring apparatus
US3161243A (en) * 1960-07-22 1964-12-15 Frank F Davis Drilling system with plural below ground motors
US3285351A (en) * 1962-08-06 1966-11-15 Michael R Caro Drilling apparatus
US3181631A (en) * 1962-08-24 1965-05-04 Cameron And Jones Inc Counter-rotating earth drill
US3232362A (en) * 1963-11-12 1966-02-01 Cullen Well drilling apparatus
US3322466A (en) * 1963-12-30 1967-05-30 Gewerk Eisenhuette Westfalia Mining machine with concentric relatively variably rotated heads
US3509949A (en) * 1966-11-09 1970-05-05 Tone Boring Co Excavation of trenches for buried walls
US3431989A (en) * 1967-07-31 1969-03-11 Willis D Waterman Planetary excavator
US3556231A (en) * 1968-08-30 1971-01-19 Homer I Henderson Bit weight maintainer for marine earth boring

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894587A (en) * 1972-12-14 1975-07-15 Hydrosol Device for drilling in hard rock formation
US3907366A (en) * 1974-08-11 1975-09-23 David R Pender Method and apparatus for mining coal or other solids in flooded mines
US4185703A (en) * 1976-06-18 1980-01-29 Coyne & Bellier, Bureau d' ingenieurs Conseils Apparatus for producing deep boreholes
US4133400A (en) * 1976-11-05 1979-01-09 Yamaha Hatsudoki Kabushiki Kaisha Snowmobile
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Also Published As

Publication number Publication date
DE2157282A1 (de) 1972-06-08
FR2115264A1 (de) 1972-07-07
DE2157282C3 (de) 1974-01-03
IT944996B (it) 1973-04-20
DE2157282B2 (de) 1973-06-07
GB1371931A (en) 1974-10-30
FR2115264B1 (de) 1973-06-29

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