US3749189A - Rock drilling bit - Google Patents

Rock drilling bit Download PDF

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Publication number
US3749189A
US3749189A US00119782A US3749189DA US3749189A US 3749189 A US3749189 A US 3749189A US 00119782 A US00119782 A US 00119782A US 3749189D A US3749189D A US 3749189DA US 3749189 A US3749189 A US 3749189A
Authority
US
United States
Prior art keywords
rock drilling
shaft
flanks
drilling bit
worm
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
Application number
US00119782A
Other languages
English (en)
Inventor
O Boehm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WERKZEUGBAU GmbH
Original Assignee
WERKZEUGBAU GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by WERKZEUGBAU GmbH filed Critical WERKZEUGBAU GmbH
Application granted granted Critical
Publication of US3749189A publication Critical patent/US3749189A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E21B10/00—Drill bits
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
    • E21B10/445—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts percussion type, e.g. for masonry
    • 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
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y10T408/9095—Having peripherally spaced cutting edges with axially extending relief channel
    • Y10T408/9097—Spiral channel

Definitions

  • the present invention relates to a rock drilling bit, and more specifically, to rock drilling bits which are suitable for use in connection with so called torsional impacting drilling machines.
  • the present rock drilling bits may comprise either a single or a double helix forming a worm around the solid shaft of the bit, whereby the worm serves for removing drilling chips or dust.
  • drilling bit and drill bit will be used interchangeably.
  • German Patent Publication No. 2,013,328 In order to increase the efficiency of moving the drilling chips or dust by means of such a rock drilling bit, it has been suggested in German Patent Publication No. 2,013,328 to make the two lateral flanks which form the worm of the drilling bit substantially symmetrical to each other and to assure that both flanks include between the flank proper and the generated surface of the drilling bitan acute angle. Moreover, the foot of each flank, that is, the area where the flank is connected to the core of the shaft, is rounded in a conventional manner. This type of construction provides a back taper for both flanks relative to the generated surface of the drill bit, whereby the space for the borings or drilling chips attains an optimum size.
  • German Patent No. 1,291,707 Another conventional rock drilling bit is described in German Patent No. 1,291,707.
  • This conventional drill bit comprises a single thread feed screw the worm of which is asymmetrical.
  • the flank of the worm which carries the borings is slightly back tapered relative to the generating surface of the bit shaft.
  • the flank foot is rounded off toward the core of the drill bit.
  • the other lateral flank is shaped as a curve which bridges the entire worm toward the core of the bit so that the bottom surface of the worm is essentially a cone shaped surface which tapers toward the tip of the drill bit.
  • this conventional rock drilling bit has a good load capacity of its worm windings, the space for receiving the borings is relatively small due to the curve shaped formation of one of its lateral flanks, whereby the feed capacity for the borings is reduced.
  • the drill bit according to the invention shall efficiently remove the borings while simultaneously having an improved structural strength against breakage;
  • a drill bit which may be constructed to comprise a single feed worm winding or a double worm winding while simultaneously having a good removal capacity for the borings and a good structural strength;
  • a rock drilling bit especially a rock drilling bit suitable for use in so called torsional impact drilling machines, wherein the bottom surface of each worm winding extends in parallel to the longitudinal axis of the drilling bit and wherein the lateral flanks of the worm winding slope in the same manner relative to said bottom surface, whereby the lateral flank which is closer to the tip of the drill bit includes together with the bottom surface an acute angle -y.
  • FIG. 1 illustrates a portion, partially in section, of a rock drilling bit according to the invention, whereby the upper part is shown in section and the lower part is illustrated as a side view;
  • FIG. 2 is an enlarged partial sectional view of the encircled portion A shown in FIG. 1.
  • FIG. 1 merely illustrates a portion of a drill bit 10 according to the invention.
  • the drill bit has a tip symbolized by the arrow 11 and a shank symbolized by the arrow 12.
  • the central longitudinal axis of the drilling bit is indicated by the dashed line 13.
  • the example embodiment shown in FIG. 1 comprises two feed worms or screws best seen in the lower side view part of FIG. 1.
  • One screw a surrounds the shaft or core 1 of the drill bit intermediate the other screw b.
  • the core I of the drill bit is surrounded by the bottom surface 2 of the worms or worm windings a and b.
  • the lateral boundaries of the worms are formed by flanks 3 and 4.
  • the bottom surface 2 extends in parallel to the longitudinal axis 13 as viewed in the sectional upper portion of the drill bit.
  • the bottom surface 2 has a cylindrical shape.
  • the lateral flanks 3 and 4 slope relative to the longitudinal axis 13 substantially in the same manner, that is, the flanks 3 and 4 each include an angle with a respective plane 14 or 15 extending perpendicularly to the longitudinal axis of the drilling bit.
  • These angles a and [3 are shown in the upper right hand portion of FIG. 1.
  • the angles a and B may be selected to be equal to each other.
  • the angles between the lateral flanks on the one hand and the bottom surface 2 of a worm winding form angles which are complementary angles relative to each other.
  • FIG. 2 illustrates on an enlarged scale a partial sectional view substantially showing the portion surrounded by the circle A in FIG. 1 thus showing a section through one winding of the feed screw, whereby the following dimensions are selected according to the invention relative to the given outer diameter D of the drilling bit.
  • the depth T of the worm winding is preferably about 0.2 to 0.3 times the outer diameter D. Smaller drill bits will be constructed so that said depth corresponds to the lower end of said given range, whereas larger drill bits will have a depth corresponding to the upper end of said range.
  • the worm windings 16 forming said flanks 3 and 4 preferably have a peripheral thickness S which is equal to about 0.07 to 0.2 times the outer diameter D.
  • the angle a may, for example, in those instances where a and B are not equal to each other be within the range of 4 to 7 whereas the angle fi then may be preferably within the range of 15 to 20.
  • the footing of the winding 16 has an enlarged cross sectional area as compared to the peripheral thickness S, whereby the structural strength and the load capacity of the present drill bit is substantially improved as compared to the prior art. Moreover,
  • the footing is shown to be rounded off as indicated by reference numerals 17 and 18.
  • each worm means comprising a bottom surface and two lateral flanks, said bottom surface extending in parallel to said longitudinal axis relative to any arbitrary axial section through the shaft, the improvement comprising a first angle a of about 4 to 7 included between any of said lateral flanks closer to said tip (11) and a first plane extending perpendicularly to said longitudinal axis, a second angle B of about 15 to 20 included between the respective opposite flank closer to the shank (l2) and a further plane extending in parallel to said first plane, all of said lateral flanks having a slope which points toward said tip, whereby an acute angle 7 -y) facing toward said tip is included between the slope of any one of said flanks and said longitudinal axis.

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)
US00119782A 1970-12-02 1971-03-01 Rock drilling bit Expired - Lifetime US3749189A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702059232 DE2059232B1 (de) 1970-12-02 1970-12-02 Gesteinsbohrer

Publications (1)

Publication Number Publication Date
US3749189A true US3749189A (en) 1973-07-31

Family

ID=5789730

Family Applications (1)

Application Number Title Priority Date Filing Date
US00119782A Expired - Lifetime US3749189A (en) 1970-12-02 1971-03-01 Rock drilling bit

Country Status (6)

Country Link
US (1) US3749189A (da)
CH (1) CH517245A (da)
DE (1) DE2059232B1 (da)
DK (1) DK139664B (da)
FR (1) FR2117010A5 (da)
NL (1) NL7102713A (da)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4210215A (en) * 1977-08-04 1980-07-01 Hawera Probst Gmbh & Co. Rock drill with helical dust conveying groove
US4458769A (en) * 1980-04-16 1984-07-10 Hilti Aktiengesellschaft Rock drill
US4459881A (en) * 1981-09-08 1984-07-17 Hughes Jr Benjamin W Cable coring and stripping tool and method
US4475850A (en) * 1981-08-16 1984-10-09 Penoza Frank J Split helix router bit
US4572714A (en) * 1980-12-24 1986-02-25 Fuji Jukogyo Kabushiki Kaisha Router bit
US4610581A (en) * 1982-07-09 1986-09-09 Lambert Consolidated Industries, Inc. End mill and method
US4924953A (en) * 1988-04-23 1990-05-15 Hawera Probst Gmbh & Co. Rock drill
US4967855A (en) * 1988-10-12 1990-11-06 Hawera Probst Gmbh & Co. Drilling tool
US5035552A (en) * 1988-09-29 1991-07-30 Lysenko Viktor G Twist drill for deep hole drilling
US5040620A (en) * 1990-10-11 1991-08-20 Nunley Dwight S Methods and apparatus for drilling subterranean wells
US5641028A (en) * 1995-08-10 1997-06-24 Black & Decker Inc. Drill bit with debris conveying flute
US5641027A (en) * 1995-01-09 1997-06-24 Utd Incorporated Drilling system
US6056073A (en) * 1997-03-17 2000-05-02 S.M.F. International Element of a rotating drill pipe string
EP1024246A1 (de) * 1999-01-26 2000-08-02 Plica Werkzeugfabrik Ag Bohrwerkzeug
US20100135741A1 (en) * 2008-12-03 2010-06-03 Black & Decker Inc. Drill Bit Including One Piece Cutting Head
EP2876246A1 (de) * 2013-11-21 2015-05-27 BAUER Maschinen GmbH Bohrschnecke zum Erdbohren

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4210215A (en) * 1977-08-04 1980-07-01 Hawera Probst Gmbh & Co. Rock drill with helical dust conveying groove
US4458769A (en) * 1980-04-16 1984-07-10 Hilti Aktiengesellschaft Rock drill
US4549616A (en) * 1980-04-16 1985-10-29 Hilti Aktiengesellschaft Rock drill
US4572714A (en) * 1980-12-24 1986-02-25 Fuji Jukogyo Kabushiki Kaisha Router bit
US4475850A (en) * 1981-08-16 1984-10-09 Penoza Frank J Split helix router bit
US4459881A (en) * 1981-09-08 1984-07-17 Hughes Jr Benjamin W Cable coring and stripping tool and method
US4610581A (en) * 1982-07-09 1986-09-09 Lambert Consolidated Industries, Inc. End mill and method
US4924953A (en) * 1988-04-23 1990-05-15 Hawera Probst Gmbh & Co. Rock drill
US5035552A (en) * 1988-09-29 1991-07-30 Lysenko Viktor G Twist drill for deep hole drilling
US4967855A (en) * 1988-10-12 1990-11-06 Hawera Probst Gmbh & Co. Drilling tool
US5040620A (en) * 1990-10-11 1991-08-20 Nunley Dwight S Methods and apparatus for drilling subterranean wells
US5641027A (en) * 1995-01-09 1997-06-24 Utd Incorporated Drilling system
US5641028A (en) * 1995-08-10 1997-06-24 Black & Decker Inc. Drill bit with debris conveying flute
US6056073A (en) * 1997-03-17 2000-05-02 S.M.F. International Element of a rotating drill pipe string
EP1024246A1 (de) * 1999-01-26 2000-08-02 Plica Werkzeugfabrik Ag Bohrwerkzeug
US20100135741A1 (en) * 2008-12-03 2010-06-03 Black & Decker Inc. Drill Bit Including One Piece Cutting Head
US7861807B2 (en) 2008-12-03 2011-01-04 Black & Decker Inc. Drill bit including one piece cutting head
EP2876246A1 (de) * 2013-11-21 2015-05-27 BAUER Maschinen GmbH Bohrschnecke zum Erdbohren
CN104653110A (zh) * 2013-11-21 2015-05-27 包尔机械有限公司 用于土地钻孔的螺旋钻

Also Published As

Publication number Publication date
FR2117010A5 (da) 1972-07-21
CH517245A (de) 1971-12-31
DE2059232B1 (de) 1972-03-09
DK139664B (da) 1979-03-26
NL7102713A (da) 1972-06-06

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