EP0009838B1 - Foret à pierre pour perceuse-frappeuse ou marteau électrique - Google Patents

Foret à pierre pour perceuse-frappeuse ou marteau électrique Download PDF

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Publication number
EP0009838B1
EP0009838B1 EP79200533A EP79200533A EP0009838B1 EP 0009838 B1 EP0009838 B1 EP 0009838B1 EP 79200533 A EP79200533 A EP 79200533A EP 79200533 A EP79200533 A EP 79200533A EP 0009838 B1 EP0009838 B1 EP 0009838B1
Authority
EP
European Patent Office
Prior art keywords
bit
diameter
drill
profile
cylindrical surface
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
Application number
EP79200533A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0009838A1 (fr
Inventor
Raymond Guex
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.)
Ph Guex & Fils Sa
Original Assignee
Ph Guex & Fils Sa
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 Ph Guex & Fils Sa filed Critical Ph Guex & Fils Sa
Priority to AT79200533T priority Critical patent/ATE1638T1/de
Publication of EP0009838A1 publication Critical patent/EP0009838A1/fr
Application granted granted Critical
Publication of EP0009838B1 publication Critical patent/EP0009838B1/fr
Expired 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 subject of the present invention is a stone drill, for a drill or electric hammer, having a head with an outside diameter between 5 and 12 mm, provided with a hard metal plate and two identical helical flutes, comprising guide lips. for waste disposal and whose diameter of the cylindrical core is greater than half the outside diameter of the drill.
  • the object of the invention is limited to drills of small diameter, from 5 to 12 mm, in particular for the installation of wall anchors, because the problems which arise are different for these small diameters than for diameters greater than 12 mm and cannot be resolved by the same means.
  • the stone drills still used today have deep flutes having a circular profile with a large curvature similar to the profile of flutes of drills for drilling metal.
  • the lips or guide strips are therefore necessarily relatively wide, their surface representing approximately 50% of the surface of the cylindrical envelope of the drill. If the resistance of the drill is good and the guidance excellent, on the other hand the friction surface is considerable which causes rapid and high heating.
  • the waste which is mainly in the form of more or less fine-grained powder, tends to get caught in the flutes, relatively narrow and deep, which causes a blockage, increases the heating of the drill and the torque. rotary and therefore the heating of the machine driving the drill, which has the consequence of limiting the working speed, that is to say of penetration and causing the breakage of the drill subjected to a too high torsional force.
  • Drills with two flutes with a profile in an arc of a circle and of different depths are also known, obtained by rolling (US-A-3469643).
  • the main flute is deep and therefore the drill has a core of low resistance and the evacuation of waste is not favorable given the slight slope of the propeller.
  • the object of the present invention is to further increase the working speed without further stressing the drill or reducing its service life.
  • each flute has, in axial section, a profile in an arc of a radius of radius between 8 mm and 15 mm , that the ratio of the surface of the two guide lips and the surface of the external cylindrical envelope of the drill is less than 5%, that the angle of the flute helix relative to the axis of the drill is included between 30 and 35 °, and that the ratio between the minimum diameter of the core of the drill and the outside diameter of the cylindrical casing is between 0.6 and 0.65.
  • the depth of the flutes decreases from the head to the tail, which increases the mechanical resistance of the drill.
  • the hard metal plate does not exceed the cylindrical envelope of the drill as is the case of known drills. This is possible due to the very small width of the lips.
  • This last characteristic offers several advantages: reinforcement of the support behind the plate and on all its height: better guidance and better cylindricity of the hole; symmetrically distributed waste disposal volume; perfect junction with helical flutes without reducing the passage section. It is also not necessary to provide a reduction in the depth of the flutes near the head as provided in the drill according to patent DE-B-23 58 447.
  • the drill represented in FIG. 1 comprises, like the known drills, a fixing shank 1, a body 2 and a head 3 provided with a hard metal plate 4.
  • This body has two helical flutes 6 and 7 between which extend two guide lips 8 and 9 having a cylindrical surface coincident with the cylindrical casing 5 of the drill.
  • the angle of the propeller a relative to the axis of the drill is between 30 and 35 °.
  • the cylindrical surface of each of the lips 8 and 9 represents, before wear only 1 to 2% of the surface of the envelope. After some wear, this surface can reach approximately 5% of the surface of the cylindrical casing 5.
  • the drill is further characterized by a very slight profile of flutes (6 and 7).
  • the profile of the flutes 6 and 7 is in the form of a highly taut circular arc.
  • the radius R of curvature of this profile is equal to 12.5 mm.
  • the minimum diameter that is to say the diameter of the core of the drill D n , as well as the outside diameter De.
  • the ratio D n / D e is always at less than 0.6 and between 0.6 and 0.65.
  • the flutes (6 and 7) have a shape such that the connection of this shape with the primitive cylinder of diameter D B takes place harmoniously and does not offer any apparent weakness.
  • the resistance of the drill is optimal.
  • the depth of the flutes (6 and 7) gradually decreases from the head 3 towards the shank 1, the radius of curvature R of the profile of the flutes (6 and 7) and the pitch of the propeller being constant and the width of the lips (8 and 9) increasing.
  • the volume of these limited by the cylindrical casing 5, of diameter De, of the drill, is perfectly sufficient to ensure excellent evacuation of the waste, this evacuation being moreover favored precisely by this stretched arc profile which does not have angles in which the waste would be likely to accumulate.
  • the very small area of the guide lips 8 and 9 greatly reduces the friction during drilling.
  • the optimal radius of curvature R of the flutes (6 and 7) varies according to the outside diameter De of the drill. It is for example 9.5 mm for an initial outside diameter D 8 of the drill body of 7.5 mm, 10 mm for an initial outside diameter De of 6.5 mm and 11 mm for an initial outside diameter De of 10.0 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling Tools (AREA)
  • Earth Drilling (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
EP79200533A 1978-09-28 1979-09-24 Foret à pierre pour perceuse-frappeuse ou marteau électrique Expired EP0009838B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79200533T ATE1638T1 (de) 1978-09-28 1979-09-24 Gesteinsbohrer fuer drehschlagbohrmaschine oder elektrischen hammer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH10115/78 1978-09-28
CH1011578A CH626557A5 (it) 1978-09-28 1978-09-28

Publications (2)

Publication Number Publication Date
EP0009838A1 EP0009838A1 (fr) 1980-04-16
EP0009838B1 true EP0009838B1 (fr) 1982-10-13

Family

ID=4359526

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79200533A Expired EP0009838B1 (fr) 1978-09-28 1979-09-24 Foret à pierre pour perceuse-frappeuse ou marteau électrique

Country Status (9)

Country Link
US (1) US4286677A (it)
EP (1) EP0009838B1 (it)
AT (1) ATE1638T1 (it)
BE (1) BE878960A (it)
CH (1) CH626557A5 (it)
DE (2) DE7927045U1 (it)
FR (1) FR2437921A1 (it)
GB (1) GB2035158B (it)
IT (2) IT1123326B (it)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3317989A1 (de) * 1983-05-18 1984-11-22 Hawera Probst Gmbh + Co, 7980 Ravensburg Bohrwerkzeug
US4561813A (en) * 1983-06-06 1985-12-31 M. A. Ford Mfg. Co., Inc. Drill
US4759667A (en) * 1985-11-08 1988-07-26 American Telephone And Telegraph Company, At&T Technologies, Inc. Twist drill for drilling printed circuit board laminates and having an drill point geometry
DE3540355C2 (de) * 1985-11-14 1996-01-11 Duss Maschf Bohrer zum drehschlagenden Bohren
DE4419641A1 (de) * 1994-06-04 1995-12-07 Hilti Ag Gesteinsbohrer
US5918105A (en) * 1994-12-12 1999-06-29 Black & Decker Inc. Cutting tools for drilling concrete, aggregate, masonry or the like materials
TW299385B (en) 1994-12-12 1997-03-01 Black & Decker Inc Cutting tools for drilling concrete, aggregate, masonry or the like materials
US5641028A (en) * 1995-08-10 1997-06-24 Black & Decker Inc. Drill bit with debris conveying flute
KR100414324B1 (ko) * 1995-08-10 2004-02-18 블랙 앤 덱커, 인코포레이티드 콘크리트,쇄석또는석조물드릴가공용절삭공구
DE19722519A1 (de) * 1997-05-30 1998-12-03 Hawera Probst Gmbh Bohrwerkzeug

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2318631A (en) * 1942-02-05 1943-05-11 Richard H Quillin Masonry drill
DE1291707B (de) * 1965-03-13 1969-04-03 Hawera Probst Kg Hartmetall Gesteinsbohrer
DE1602003B1 (de) * 1966-06-08 1971-03-11 Netherlands Tool Mfg Co Gesteinsbohrer
AT286064B (de) * 1968-01-04 1970-11-25 Hawera Hartmetall Werkzeugfarb Spiralbohrer
FR1595690A (it) * 1968-11-12 1970-06-15
DE1927754C3 (de) * 1969-05-30 1978-12-14 Hawera Probst Gmbh + Co, 7980 Ravensburg Gesteinsbohrer
FR2083938A5 (it) * 1970-03-26 1971-12-17 Werkzeugbau Gmbh
DE2057892A1 (de) * 1970-11-25 1972-06-08 Reinholdt As H Gesteinsbohrer fuer Schlagbohrmaschinen
DE2159728A1 (de) * 1971-12-02 1973-06-07 Heller Geb Hammerbohrer
DE2211532C2 (de) * 1972-03-10 1982-07-01 Hawera Probst Gmbh + Co, 7980 Ravensburg Bohrer mit wendelförmiger Bohrmehlnut
FR2184092A1 (it) * 1972-05-11 1973-12-21 Skil Nederland Nv
DE2506611A1 (de) * 1975-02-17 1976-08-26 Drespa Geb Biebersdorf Ursula Drehbohrkopf fuer bohrungen mit hoher zielgenauigkeit

Also Published As

Publication number Publication date
US4286677A (en) 1981-09-01
IT7925978A0 (it) 1979-09-25
DE7927045U1 (de) 1979-12-13
GB2035158A (en) 1980-06-18
IT7922663V0 (it) 1979-09-25
DE2963850D1 (en) 1982-11-18
CH626557A5 (it) 1981-11-30
ATE1638T1 (de) 1982-10-15
FR2437921B1 (it) 1982-07-23
EP0009838A1 (fr) 1980-04-16
FR2437921A1 (fr) 1980-04-30
BE878960A (fr) 1980-01-16
IT1123326B (it) 1986-04-30
GB2035158B (en) 1982-07-28

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