US3891039A - Method and device for drilling to a predetermined surface - Google Patents

Method and device for drilling to a predetermined surface Download PDF

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Publication number
US3891039A
US3891039A US466300A US46630074A US3891039A US 3891039 A US3891039 A US 3891039A US 466300 A US466300 A US 466300A US 46630074 A US46630074 A US 46630074A US 3891039 A US3891039 A US 3891039A
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United States
Prior art keywords
drilling
output
reference surface
drill
registering
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Expired - Lifetime
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US466300A
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English (en)
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Gunnar Lagerstrom
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Atlas Copco AB
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Atlas Copco AB
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/02—Drilling rigs characterized by means for land transport with their own drive, e.g. skid mounting or wheel mounting
    • E21B7/025—Rock drills, i.e. jumbo drills
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B45/00—Measuring the drilling time or rate of penetration
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/02—Determining slope or direction
    • E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/04—Measuring depth or liquid level
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/02—Drilling rigs characterized by means for land transport with their own drive, e.g. skid mounting or wheel mounting
    • E21B7/022—Control of the drilling operation; Hydraulic or pneumatic means for activation or operation
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/02—Drilling rigs characterized by means for land transport with their own drive, e.g. skid mounting or wheel mounting
    • E21B7/024—Drilling rigs characterized by means for land transport with their own drive, e.g. skid mounting or wheel mounting having means for adapting to inclined terrain; having means for stabilizing the vehicle while drilling
    • 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
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/18—Cutting by use of rotating axially moving tool with stopping upon completion of prescribed operation
    • 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
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/21—Cutting by use of rotating axially moving tool with signal, indicator, illuminator or optical means

Definitions

  • ABSTRACT A method and a device for rock-drilling and/or earth boring of a number of drill-holes to a predetermined bottom surface are disclosed in which a reference surface defined by electro-magnetic radiation is generated parallel to the bottom surface, the distance between the reference surface and the point at which drilling is to be initiated is measured in a direction common to all holes, the penetration of the drill-rod into the ground is added to said distance, and drilling is interrupted when the sum indicates that the bottom surface has been reached.
  • the disclosed device comprises a reference surface finder for measuring the distance between the reference surface and the point at which drilling is to be initiated. The distance is measured by counting pulses generated by the finder. The penetration of the drill-rod into the ground is measured by counting pulses generated by a sensor coupled to the feed device of the rock-drilling machine.
  • the present invention relates to a method and a device for rock-drilling and/or earth boring of a number of drill-holes to a predetermined preferably plane bottom surface.
  • This bottom surface can e.g. be a surface which lies close to the surface of a road under construction.
  • the invention is, however, not restricted to constructing roads but can advantageously be used in all those cases when drilling to a predetermined bottom surface is to occur.
  • the method presently used comprises a timeconsuming tracing out of each drill-hole in order to determine its required depth which furthermore must be indicated at the point where drilling is to occur.
  • a drill-rod which comprises one or more rod sections is used. In most cases drilling is to be interrupted when the last rod section only partly has penetrated into the ground. If drilling is not performed to the required depth protruding rock formations are left at the subsequent blasting. In order to remove these further drilling and blasting must be done. Before that the already blasted rock mass must be excavated. It is hereby a large risk that the buckets of the loading machines are damaged when they hit the protruding rock formations.
  • the object of the present invention is to achieve a simple and safe indication of how far the drilling work has advanced in relation to a reference surface defined by electro-magnetic radiation through which drilling can be interrupted when the predetermined bottom surface has been reached which according to an advantageous embodiment of the invention is done automatically.
  • FIG. 1 shows an embodiment of the invention with freestanding reference surface finder.
  • FIG. 2 shows another embodiment in which the reference surface finder is mounted on the feed beam of the drilling aggregate.
  • FIG. 3 shows the embodiment according to FIG. 1 with a control system adapted thereto.
  • FIG. 4 shows the embodiment according to FIG. 1 with a simplified control system adapted thereto.
  • FIG. 5 shows the embodiment according to FIG. 2 with a control system adapted thereto.
  • a reference surface 102 is produced by a rotating radiation source 101.
  • This radiation source can e.g. consist of a laser made in the way shown in Swedish Pat. No. 347,351.
  • the radiation source is directed such that the reference surface 102 is parallel to the predetermined bottom surface 103.
  • a drilling aggregate is used, which comprises a chassis 104 on which a supporting arm 105 is mounted.
  • a feed beam 106 for a rock-drilling machine 107 is mounted on the supporting arm.
  • the rockdrilling machine is driven along the feed beam 106 by a feed motor 109 via a chain or a screw in a manner well known to a skilled person.
  • a drillrod 108 is connected to the rock-drilling machine 107.
  • a freestanding reference surface finder is used which comprises a support 111, a telescopic mast 112, and an arm 113 for sensing the level of the point 99 on the ground 100 where drilling is to begin.
  • the mast 112 is at its upper end provided with a photo detector 116 which comprises a number of photo cells e.g. such with the designation BPY63 manufactured by Siemens, which suitably are mounted such that the radiation source 101 can be sensed independent of its horizontal direction.
  • the photo detector 116 is suitably provided with simple plastic optics for restriction of the vertical field of sensitivity and a filter which is adapted to the colour of the radiation source. Through this the influence of e.g. sun light is decreased.
  • the support 111 comprises reversible driving devices for the mast 112 and the arm 113.
  • the mast can e.g be driven upwards through exposing its inner space to a fluid pressure and downwards by a pressure-fluid motor which via a wire fastened to the tip of the mast draws the mast together.
  • the arm 113 can be driven by a reversible pressure-fluid motor or a reversible electric motor.
  • electrically controlled valves are used which are supposed to comprise amplifiers or relays so that they can be driven by those signals which are achieved from logic circuits.
  • Pulse generating sensors are connected to the drivings of the mast 112 and the arm 113. These can e.g.
  • the feeding of the drilling machine 107 is measured in a similar way.
  • the arm 113 is movable between an upper limit position 114, which is situated at the same level as the lower limit position of the photo detector 116, and a lower limit position 115.
  • the device according to FIG. 2 differs from the device according to FIG. I only thereby that the mast 122 is mounted on the feed beam 106.
  • the mast 122 is driven by a motor 121.
  • A deisgnates the distance between the reference surface 102 and the bottom surface 103, H the distance between the limit position 114 and the reference surface 102, K the distance between the limit position 114 and the point of application 99, D the depth of the drillhole, and v the angle between the drilling direction and the vertical line.
  • K is here the constant distance between the lower limit position of the photo detector 116 and the pointof application 99.
  • the drilling machine 107 is in FIG. 3 shown with a, as a power supply disconnector operating, electrically controlled valve 47 which disconnects the pressurefluid supply through the conduit 48 to the hammer device of the drilling machine when a voltage, logic 1- signal, is supplied to the input 49.
  • the valve 47 is supposed to comprise an amplifier through which control by means of logic signals is possible.
  • the support 111 comprises a number of indicators or sensors 19, 21, 30, 31, and 32 and two pulse generating sensors 91 and 2, which is shown by means of the line 95.
  • the indicator 19 produces a logic lsignal, also called signal, at its output when the arm 113 hits the ground.
  • the indicator 21 produces a signal at its output when the mast 112 is in its highest position which if that should be wished can be adjustable.
  • the indicator comprises the photo detector 116, amplifier with filter for surpressing undesirable signals and an output device e.g. a Schmitttrigger, which produces a signal at its output when the photo detector 116 senses the radiation source 101.
  • the indicator 31 produces a signal at its output when the arm 113 is in its upper limit position 114.
  • the indicator 32 produces a signal at its output when the photo detector 116 is in its lower limit position 114.
  • the sensors 91 and 2 which are connected to the mast and arm motors have two outputs designated UP and DOWN. These sensors produce two phase shifted pulse trains so that the rotational direction of the sensors can be sensed.
  • the sensors comprise pulse forming elements e.g.
  • a sensor 3 is connected to the motor 109 or the chain or screw driven thereby which sensor is of the same type as the sensors 91 and 2. This is shown by the line 97.
  • An angle sensor 26 is connected to the feed beam 106 which is shown by the line 98. This sensor can either be made such that it gives a signal which is proportional to the angle v or such that it gives a signal which is porportional to cos v.
  • the sensor can also be substituted by a thumbwheel switch.
  • the feed beam 106 is provided with a drill guide 110 which comprises a pair of tongs .33, provided with an indicator, by which the drillrod 108 can be held.
  • the indicator 33 produces a signal at its output when the tongs grip the drill-rod.
  • the line 96 indicates the position of the indicator 33.
  • Other electronics is mounted on the chassis 104 of the drilling aggregate.
  • the control electronics is mainly built up from integrated circuits and shown as a logic circuit diagram.
  • the control electronics comprises over already mentioned indicators and sensors three adders 4, 5, and 6. These are provided with two inputs and an output and work such that each pulse on each input produces a pulse at the output independent of their relative position in time. Furthermore, three UP/DOWN counters 7, 8, and 9 are incorporated.
  • the multiplier 11 multiplies the number of pulses coming from the drill length sensor 3 by the value cos v which either is achieved directly from the sensor 26 or, if the sensor 26 produces the angle value, is created in the multiplier 11.
  • Three electro-mechanical impulse counters 12, 13, and 14 are incorporated in the system. These can of course be substituted by electronic count ers with digital displays.
  • the counters l2 and 13 are provided with manual zero-setting 81 and 82 respectively.
  • the counter 14 comprises two parallelly connected digital displays of which one is provided with manual preset 83.
  • Pulses which arrive at input 43 count down the preset display and simultaneously count up the other digital display. when the preset display reaches the value zero a signal is obtained at output 44.
  • the two digital displays are simultaneously restored by means of the draw magneto 80.
  • the draw magneto 80 is supposed to comprise an amplifier through which driving by means of logic signals is possible.
  • the pulse generator 24 continuously produces pulses the length and frequency of which are adapted to the counter 14.
  • Two monostable vibrators 28 and 29 are incorporated in the system. These produce an output 1 a logic 1 pulse of predetermined length and at output 0 a logic O-pulse of the same length when the voltage at the input is changed from logic O-level to logic l-level. Seven SET/RESET flip-flops 10, 15, 16, 17, 18, 20, and 27 are incorporated in the system.
  • the system furthermore comprises a number of AND-gates and OR-gates.
  • An AND-gate e.g gate 22, produces a logic l-signal at its output only if all inputs are supplied with logic l-signals.
  • An OR- gate e.g. gate 50, produces a logic l-signal at its output if one or mroe of the inputs are supplied with logic 1- signal.
  • the gates may be provided with inverting inputs or outputs which is indicated by a small circle.
  • Invertion means that a logic l-signal is changed to a logic 0- signal or vice versa.
  • All electronic circuits in the system are provided with supply voltage from a voltage source, which may comprise an accumulator, via a holding relay 25.
  • the voltage source and the relay are here supposed to be built together to one unit.
  • the system comprises two contact devices 34 and 35 with momentary closing function.
  • the conduits and 71 are connected to a voltage having logic l-level.
  • two indicators are incorporated which produce light and/or sound signals. These are shown as lamps 41 and 42.
  • the method according to the invention is realized in the following way.
  • the radiation source 101 is directed such that the reference surface 102 becomes parallel to the bottom surface 103.
  • the distance H K between the reference surface and the point of application 99 is measured by the mast 112 and the arm 113 and registered in the counter 14.
  • Dcos v of the depth of the drill-hole is added.
  • a signal is obtained at output 44. This signal shuts off the hammer device of the drilling machine 107 via the flip-flop 18, the gate 68 the output 40 of which is connected to input 49 on valve 47, and the valve 47.
  • the designation high refers to a voltage having logic l-level and low to a' voltage having logic O-level.
  • the initial condition for this description is that the voltage supply has been shut off and that the mast 112 and the arm 113 are not in anyone of their liinit positions.
  • voltage is supplied from the conduit 70 to the holding relay 25, through which all circuits are provided with supply voltage, and to input S of flip-flop 20.
  • output l'becomes high through which output 0 of flip-flop 16 becomes high and the outputs of gates 61 and'62 low. Since the arm 113 is not in its upper limit position 114 the output of indicator 31 is low.
  • Both inputs on gate 63 are therefore low and its output 37 therefore high.
  • This output is connected to the motor of arm 113 such that the arm through this is returned towards the limit position 114. Since the photo detector 116 is not in its lower limit position 114 the output of indicator 32 is low. Since the output of indicator 31 is low the output of gate 66 is low and therefore both inputs on gate 65 low. Since the output of gate 61 is low both inputs on gate 64 are low. This means that the output 39 of the gate 64 is high.
  • This output is connected to the driving of mast 112 such that the mast through this is returned towards the limit position 114. When the arm 113 reaches its upper limit position 114 the output of indicator 3] becomes high through which output 37 of gate 63 becomes low through which the driving of arm 113 is interrupted.
  • the hammer device of the drilling machine 107 starts and drilling can begin. Since the arm 113 is not in contact with the ground the output of indicator 19 is low and since output 0 of flip-flop 16 is low both inputs on gate 59 are low and therefore its output 36 high. This output is connected to the driving motor of arm 113 such that the arm through this is driven towards the ground. Since the photo detector 116 does not sense the radiation source 101 the output of indicator 30 is low. Since furtermore output 1 of flip-flop 27 is low both inputs on gate 57 are low and therefore its output low. Since furthermore output 0 of flip-flop 16 is low both inputs on gate 60 are low and therefore its output 38 high. This output is connected to the driving of mast 112 such that the mast through this is driven upwards.
  • the monostable vibrator 29 delivers a logic 0-pulse to input LOAD on counter 9 through which the value stored in counter 7 is transferred to counter 9. Since output 1 on flip-flop 15 and output 0 on flip-flop 17 both are high pulses from the pulse generator 24 can pass through gate 23. These pulses are partly supplied to input DOWN on counter 9 and partly via the adder 6 to gate 56. Since output 0 on flip-flop 18 is high the pulses pass gate 56 and are registered in counter 14. During the drilling work the tongs of the drill guide 110 do not grip the drill-rod 108 so that the output of indicator 33 is low. When the drilling machine 107 is fed forwards along the feed beam 106 the sensor 3 delivers pulses at output DOWN.
  • the drilling machine 107 is disconnected from the drill-rod 108 and returned to its backward position on the feed beam 106.
  • One more rod section is connected to the drill-rod 108 after which the drilling machine 107 is connected to the drill-rod extended in this way.
  • the output of indicator 33 becomes low and the drilling work can proceed as described above.
  • a control system is used which differs from the one shown in FIG. 3 mainly thereby that the UP/DOWN counters have been excluded.
  • a photo detector 116, an amplifier and filter 140, and an output device 141 which e.g. can be made as a Schmitt-trigger are used for sensing the reference surface 102.
  • These three units correspond together to the indicator 30 in FIG. 3.
  • the sensors 134, 135, and 136, which are connected to the feed motor 109, the motor of the arm 113, and the motor of the mast 112 respectively, are in this embodiment of a simpler construction than the corresponding sensors in the embodiment according to FIG. 3. They cannot sense the rotational direction of respective motors.
  • the monostable vibrators 137, 138, and 139 have been shown as separate units.
  • Three indicators are used in the system according to FIG. 4, e.g.
  • the forward feeding of drilling machine 107 along the feed beam 106 is registered during drilling via the sensor 134, the monstable vibrator 137 and, since the outputs of indicators 131, 132, and 133 are high, the gate 151 in counter 13. These pulses are also supplied to the multiplier 11 where the number of them is modified by the value cos v which is obtained from the sensor 26. The pulses leaving multiplier 11 are supplied to counter 14 via adder 6.
  • the output of indicator 19 becomes high and gate 150 blocks signals from sensor 135.
  • the motor of arm 113 is provided with a mechanical clutch device which interrupts the driving of the arm when it hits the ground.
  • the photo detector 116 comes in contact with the reference surface 102 the output of the output device 141 becomes high. Through this output 1 of flip-flop 142 becomes low and its output high and output 1 of flip-flop 143 high. As a result of this,
  • the mast 122 is mounted on the feed beam 106.
  • a circuit 144 is provided in this system for generating a number of pulses which corresponds to the distance K in FIG. 2. This circuit replaces the arm 113 in FIGS. 3 and 4.
  • the multiplier 11 has in FIG. 5 been moved so that the total number of pulses from sensors 134 and 136 are multiplied by cos v in accordence with the relation A (H K D) cos v obtained from FIG. 2 and the gate 153 has replaced gates 149 and 152 in FIG. 4. Otherwise the system according to FIG. 5 works in principle in the same way as the system according to FIG. 4 so that a detailed description of its function is unnecessary.
  • a method of rock-drilling and/or earth boring of a number of drill-holes to an imagined predetermined and preferably plane bottom surface comprising:
  • a device for rock-drilling and/or earth boring of a number of drill-holes to an imagined and preferably plane bottom surface comprising:
  • a drilling machine drivable along a feed device to drill holes to the bottom surface
  • a registering device connected to the feed device to register the forward feed of the drilling machine along the feed device
  • means associated with the registering device for registering the sum of the distance in a predetermined direction between said reference surface and the point at which drilling is to be initiated and the component in said direction of the depth of the drill-hole.
  • a device in which the registering device is arranged to register backward feeding of the drilling machine through which the position of the front end of a drill-rod associated with the drilling machine always is indicated.
  • a device in which the registering device includes means through which registering of the feeding of the drilling machine can be disconnected when the drill-rod is extended.
  • a device in which the registering device includes means through which registering of the feeding of the drilling machine can be disconnected when the drill-rod is extended.
  • a device in which the registering device comprises means for presetting a value proportional to the distance between the reference surface and the bottom surface and is arranged for delivering a signal when drilling reaches the depth, relative to the reference surface, corresponding to the preset value.
  • the registering device comprises means for presetting a value proportional to the distance between the reference surface and the bottom surface and is arranged for delivering a signal when drilling reaches the depth, relative to the reference surface, corresponding to the preset value.
  • the registering device comprises means for presetting a value proportional to the distance between the reference surface and the bottom surface and is arranged for delivering a signal when drilling reaches the depth, relative to the reference surface, corresponding to the preset value.
  • the registering device comprises means for presetting a value proportional to the distance between the reference surface and the bottom surface and is arranged for delivering a signal when drilling reaches the depth, relative to the reference surface, corresponding to the preset value.
  • a device comprising a power supply disconnector associated with the drilling machine and coupled to the registering device for disconnecting the power supply responsive to the delivery of said signal from the registering device.
  • a device according to claim 10 in which the device for generating the reference surface comprises a laser.
  • a device in which the mast is a telescopic mast.
US466300A 1973-05-15 1974-05-02 Method and device for drilling to a predetermined surface Expired - Lifetime US3891039A (en)

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SE7306858A SE373184B (xx) 1973-05-15 1973-05-15

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US (1) US3891039A (xx)
JP (1) JPS5019202A (xx)
AT (1) AT333687B (xx)
CA (1) CA1022919A (xx)
CH (1) CH571148A5 (xx)
FR (1) FR2229818B1 (xx)
GB (1) GB1437885A (xx)
IT (1) IT1016000B (xx)
NO (1) NO137021C (xx)
SE (1) SE373184B (xx)
ZA (1) ZA742761B (xx)

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US4113033A (en) * 1974-12-19 1978-09-12 Atlas Copco Aktiebolag Method and arrangement for positioning a working tool to a predetermined direction and/or a predetermined point
US4230189A (en) * 1977-06-07 1980-10-28 Toyo Kogyo Co., Ltd. Drilled hole end adjusting arrangement
US4240511A (en) * 1977-06-07 1980-12-23 Toyo Kogyo Co., Ltd. Drilling machine centering arrangement
US4320577A (en) * 1979-08-04 1982-03-23 The United States Of America As Represented By The Department Of Energy Automatic readout micrometer
US5060735A (en) * 1989-08-28 1991-10-29 Atlas Copco Construction And Mining Technique Ab Device for positioning of a drill bit
US6460634B1 (en) * 1999-01-20 2002-10-08 Christopher A Hart Pipe clamp
US20030202091A1 (en) * 2002-04-18 2003-10-30 Jaime Garcia Modular assisted visualization system
US20040032587A1 (en) * 2002-08-15 2004-02-19 Garcia Jaime E. Optical alignment system for power tool
US20050160895A1 (en) * 2002-10-31 2005-07-28 Garcia Jaime E. Dual bevel table saw
US20050188806A1 (en) * 2002-10-31 2005-09-01 Garcia Jaime E. Riving knife assembly for a dual bevel table saw
US20050270531A1 (en) * 2004-06-02 2005-12-08 Garcia Jaime E Optical alignment system for power tools
US20060075867A1 (en) * 2002-11-27 2006-04-13 Etter Mark A Laser apparatus
US20060076385A1 (en) * 2002-04-18 2006-04-13 Etter Mark A Power tool control system
US20060096425A1 (en) * 2003-04-29 2006-05-11 Keller David V System and method for rapidly stopping a spinning table saw blade
US20060104731A1 (en) * 2002-04-18 2006-05-18 Etter Mark A Drill press
US20060101969A1 (en) * 2002-06-19 2006-05-18 Garcia Jaime E Optical alignment system
US20060101958A1 (en) * 2003-07-31 2006-05-18 Garcia Jaime E Table saw
US20060101961A1 (en) * 2002-04-18 2006-05-18 Etter Mark A Power tool control system
US20060106482A1 (en) * 2002-04-18 2006-05-18 Etter Mark A Power tool control system
US20060111809A1 (en) * 2002-04-18 2006-05-25 Etter Mark A Graphical user interface
US20060116787A1 (en) * 2002-04-18 2006-06-01 Etter Mark A Power tool control system
US7073268B1 (en) 2002-04-18 2006-07-11 Black & Decker Inc. Level apparatus
US7243440B2 (en) 2004-10-06 2007-07-17 Black & Decker Inc. Gauge for use with power tools
US20120279782A1 (en) * 2009-11-11 2012-11-08 Jordan O'reilly Laser alignment device for use with a drill rig
CN116291197A (zh) * 2023-05-10 2023-06-23 湖南百舸水利建设股份有限公司 三角履带式坡面锥孔机及其钻孔方法
CN116335624A (zh) * 2023-05-29 2023-06-27 湖南创远智能发展有限责任公司 天井钻机控制方法、装置、存储介质及天井钻机
CN117308739A (zh) * 2023-11-29 2023-12-29 国昌德工(陕西)建筑工程有限公司 一种用于公路工程施工的厚度检测设备

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Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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FR2229818B1 (xx) 1978-12-29
GB1437885A (en) 1976-06-03
NO137021C (no) 1977-12-14
JPS5019202A (xx) 1975-02-28
NO741732L (no) 1974-11-18
ZA742761B (en) 1975-06-25
CH571148A5 (xx) 1975-12-31
DE2422571A1 (de) 1974-11-28
AT333687B (de) 1976-12-10
DE2422571B2 (de) 1975-07-31
SE373184B (xx) 1975-01-27
AU6860474A (en) 1975-11-06
CA1022919A (en) 1977-12-20
NO137021B (no) 1977-09-05
IT1016000B (it) 1977-05-20
FR2229818A1 (xx) 1974-12-13
ATA396174A (de) 1976-04-15

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