EP0347601B1 - Outil de forage avec spirale transporteuse - Google Patents

Outil de forage avec spirale transporteuse Download PDF

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Publication number
EP0347601B1
EP0347601B1 EP89109302A EP89109302A EP0347601B1 EP 0347601 B1 EP0347601 B1 EP 0347601B1 EP 89109302 A EP89109302 A EP 89109302A EP 89109302 A EP89109302 A EP 89109302A EP 0347601 B1 EP0347601 B1 EP 0347601B1
Authority
EP
European Patent Office
Prior art keywords
helix
conveyor screw
drill bit
contact surface
friction
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
EP89109302A
Other languages
German (de)
English (en)
Other versions
EP0347601A1 (fr
Inventor
Bernhard Moser
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.)
Robert Bosch Power Tools GmbH
Original Assignee
Hawera Probst 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 Hawera Probst GmbH filed Critical Hawera Probst GmbH
Publication of EP0347601A1 publication Critical patent/EP0347601A1/fr
Application granted granted Critical
Publication of EP0347601B1 publication Critical patent/EP0347601B1/fr
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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
    • E21B17/073—Telescoping joints for varying drill string lengths; Shock absorbers with axial rotation
    • 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
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/22—Rods or pipes with helical structure

Definitions

  • the invention relates to a drilling tool according to the preamble of claim 1.
  • Drilling tools with interchangeable conveying coils are mainly used to produce breakthroughs using electrically or pneumatically driven rotary hammers.
  • the carbide-tipped drill head is designed as a cross-drill head or solid drill head.
  • Such tools are shown for example in DE-A-26 39 310, DE-A-30 44 775 or DE-A-25 43 578 A1.
  • the contact force generated by the support spring between the feed helix and the drill head depends on the load capacity of the plastic helix. If the contact pressure is set very high, an axial displacement of the conveying helix and thus a separation of the form-fitting connection between the conveying helix and the drill head only occurs when there is a very high load due to jamming or jamming. However, this can lead to premature destruction of the conveyor helix. Conversely, the contact pressure must be at least so great that there is always a good positive fit between the helix and the drill head to bridge the play for the helix.
  • the object of the invention is to provide a drilling tool of the type described in the introduction to improve that the conveyor helix is exposed to lower forces during operation, so that the wear of the conveyor helix and thus the risk of breakage is reduced.
  • the drilling tool according to the invention has the advantage over the known devices that the service life, in particular of a plastic conveying helix, can be increased considerably for certain purposes. According to the invention, it is provided for this that no otherwise conventional positive connection between the conveyor helix and the drill head, but a frictional connection is used.
  • the invention is based on the finding that, in practice, it has proven to be harmless if the conveying helix rotates slightly with respect to the drill head or the push-on shaft, even if the jamming is easier. This twisted position generally cannot affect unobstructed removal of drilling dust, so that a positive connection between the helix and the drilling head is not essential.
  • the contact surface between the helix and the drill head can be flat, conical or curved.
  • the latter has the advantage that a larger contact surface and thus a better frictional engagement is guaranteed.
  • the contacting contact surfaces between the helix and the drill head are roughened.
  • the roughening can e.g. B. be designed as a type of corrugation.
  • the better frictional connection can take place by means of an additionally applied friction lining or an additional friction disk.
  • the spring force of the support spring and thus the frictional engagement is adjustable. This can happen, for example, in that the support ring is adjustable in its axial position. Support springs of different hardness can also be used.
  • the drilling tool 1 shown in FIGS. 1 and 2 consists of a drill shaft 2 and a drill head 3 which, for. B. is designed as a cross drill bit, as is known for example from DE-A-34 26 977.
  • the attachable and exchangeable conveyor helix 4 is designed as a fully profiled plastic helix, d. H. the conveyor helix has its own drill helix profile. Such full plastic coils are known for example from DE-A-36 14 010.
  • a wound conveying helix can also be used, provided that the same problem according to the invention occurs there.
  • the feed spiral 4 is limited in the axial direction by the support spring 5 downwards, the support spring being supported on a support ring 6.
  • the support ring 6 consists of a radially expandable, longitudinally slotted support sleeve 7, which can be snapped into a puncture groove in the drill shaft 2, the lower part of the support spring 5 enclosing an upper support sleeve region 7 'to block the radial expansion of the support sleeve.
  • the support spring 5 has the same winding direction as the feed helix 4, so that there can be an additional funding effect for the drilling dust.
  • the axial support of the conveying spiral 4 takes place in its upper region 8 by means of a frictional connection on the contact surface 9.
  • the left one is Half of the figures as a conical or frustoconical contact surface 9 'and the right figure representation as a flat contact surface 9 ⁇ shown in an alternative embodiment.
  • the conical design of the contact surface 9 ' has the advantage of a larger connecting surface and thus an increased frictional engagement.
  • This surface can also be curved.
  • the mutual contact surfaces 9 between the helix 4 and the drill head 3 are expediently roughened.
  • a type of corrugation 10 is indicated schematically in the left figure representation of FIG. 2.
  • Another type of roughening can also be used to increase the friction torque, e.g. B. in the form of a glued or sprayed on friction lining or an additional friction disc.
  • the support spring 5 presses the feed screw 4 with a certain pressing force 11 in the direction of the drill head 3. This results in a frictional connection between the feed screw 4 and the drill head 3 under normal load on the drilling tool, so that a secure rotation of the feed screw 4 on the drill shaft 2 is ensured.
  • the contact force 11 can be changed by varying the spring hardness of the support spring 5. This would be e.g. B. guaranteed by an axial displacement or adjustability of the support ring 6 or by different strength springs 5.

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)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Earth Drilling (AREA)

Claims (6)

  1. Outil de forage, de préférence pour la réalisation d'ouvertures dans des ouvrages en béton ou de maçonnerie, comportant une hélice transporteuse (4) interchangeable et bloquée axialement, prenant appui dans la zone de la tête de foret (3), un ressort d'appui (5) pour la fixation axiale étant prévu entre l'hélice transporteuse (4) et un dispositif d'appui fixé au corps du foret (2),
    caractérisé en ce que l'appui axial de l'hélice transporteuse (4) sur la tête de foret (3) se fait au moyen d'une liaison à friction, la force de friction dépendant de la précontrainte du ressort d'appui (5).
  2. Outil de forage selon la revendication 1,
    caractérisé en ce que la surface de contact (9) entre l'hélice transporteuse (4) et la tête de foret (3) est de forme conique (9'), plate (9'') ou cintrée en section transversale.
  3. Outil de forage selon la revendication 1 ou 2,
    caractérisé en ce que la surface de contact (9) entre l'hélice transporteuse (4) et la tête de foret (3) présente des stries (10) ou analogues.
  4. Outil de forage selon une ou plusieurs des revendications précédentes,
    caractérisé en ce que la force (11) du ressort d'appui (5) et, par là même, la force de friction sur la surface de contact (9) peuvent être appliquées de façon variable.
  5. Outil de forage selon la revendication 1,
    caractérisé en ce qu un revêtement de friction supplémentaire est apposé sur la surface de contact (9) à l'aide de colle ou par pulvérisation.
  6. Outil de forage selon la revendication 1,
    caractérisé en ce qu un revêtement de friction séparé est rapporté, en tant que disque de friction, entre l'hélice transporteuse (4) et la tête de foret (3).
EP89109302A 1988-06-18 1989-05-23 Outil de forage avec spirale transporteuse Expired - Lifetime EP0347601B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3820697 1988-06-18
DE3820697A DE3820697A1 (de) 1988-06-18 1988-06-18 Bohrwerkzeug

Publications (2)

Publication Number Publication Date
EP0347601A1 EP0347601A1 (fr) 1989-12-27
EP0347601B1 true EP0347601B1 (fr) 1992-12-09

Family

ID=6356786

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89109302A Expired - Lifetime EP0347601B1 (fr) 1988-06-18 1989-05-23 Outil de forage avec spirale transporteuse

Country Status (3)

Country Link
US (1) US4942931A (fr)
EP (1) EP0347601B1 (fr)
DE (2) DE3820697A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4102794A1 (de) * 1991-01-31 1992-08-06 Hawera Probst Kg Hartmetall Bohrwerkzeug
DE4236553A1 (de) * 1992-10-29 1994-05-05 Hawera Probst Kg Hartmetall Gesteinsbohrer
DE4338667A1 (de) * 1993-11-12 1995-05-18 Hilti Ag Bohrwerkzeug
US6374931B1 (en) * 1999-11-03 2002-04-23 Relton Corporation Multiple cutter rotary hammer bit
RU2183721C2 (ru) * 2000-08-23 2002-06-20 Андониев Игорь Юлианович Бур-расширитель

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2790623A (en) * 1953-10-21 1957-04-30 Hamp W Pate Jar type reamer
DE1770951A1 (de) * 1968-07-23 1972-04-06 Boehringer Mannheim Gmbh Cyclopentanochinolonderivate und Verfahren zu deren Herstellung
US3888320A (en) * 1973-07-13 1975-06-10 Tri M Tool Corp Core drill
DE2543578C2 (de) * 1975-09-30 1986-03-06 Friedrich Duss Maschinenfabrik GmbH & Co, 7265 Neubulach Gesteinsbohrer
DE2639310A1 (de) * 1976-09-01 1978-03-02 Duss Maschf Aus werkzeug, adapter und werkzeug- kupplung bestehender baugruppensatz fuer einen schlag- oder drehschlaghammer
DE3044775A1 (de) * 1980-11-27 1982-07-08 Hilti AG, 9494 Schaan Gesteinsbohrer
DE3405070A1 (de) * 1984-02-13 1985-08-14 Hilti Ag, Schaan Gesteinsbohrer
DE3426977A1 (de) * 1984-07-21 1986-01-30 Hawera Probst Gmbh + Co, 7980 Ravensburg Gesteinsbohrer
DE8514422U1 (de) * 1985-05-15 1985-07-18 Hawera Probst Gmbh + Co, 7980 Ravensburg Bohrwerkzeug mit austauschbarer Förderwendel
DE3517560A1 (de) * 1985-05-15 1986-11-20 Hawera Probst Gmbh + Co, 7980 Ravensburg Austausch-foerderwendel fuer gesteinsbohrer
DE3614010A1 (de) * 1986-04-25 1987-11-05 Krupp Gmbh Gesteinsbohrer
DE3635538A1 (de) * 1986-10-18 1988-04-28 Hawera Probst Kg Hartmetall Bohrwerkzeug mit austauschbarer foerderwendel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BROCKHAUS; Naturwissenschaften und Technik; Band 3, Io-Ng.-1983, S. 112-113 *

Also Published As

Publication number Publication date
DE3820697A1 (de) 1989-12-21
EP0347601A1 (fr) 1989-12-27
US4942931A (en) 1990-07-24
DE58902943D1 (de) 1993-01-21

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