FR2381512A1 - Drill bit for brick and concrete - has two to four lobes with inverted vee point to commence cutting at periphery - Google Patents

Drill bit for brick and concrete - has two to four lobes with inverted vee point to commence cutting at periphery

Info

Publication number
FR2381512A1
FR2381512A1 FR7705521A FR7705521A FR2381512A1 FR 2381512 A1 FR2381512 A1 FR 2381512A1 FR 7705521 A FR7705521 A FR 7705521A FR 7705521 A FR7705521 A FR 7705521A FR 2381512 A1 FR2381512 A1 FR 2381512A1
Authority
FR
France
Prior art keywords
lobes
brick
concrete
periphery
point
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.)
Withdrawn
Application number
FR7705521A
Other languages
French (fr)
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7705521A priority Critical patent/FR2381512A1/en
Publication of FR2381512A1 publication Critical patent/FR2381512A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/14—Configuration of the cutting part, i.e. the main cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/20—Number of cutting edges
    • B23B2251/202—Three cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/20—Number of cutting edges
    • B23B2251/204—Four cutting edges

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling Tools (AREA)

Abstract

The drill bit is used for piercing brick or concrete or in dentistry and is made from high speed steel or tungsten carbide. It comprises a suitable shank (11) for holding in a chuck, and from two to four cutting lobes (12). The larger number of lobes provide increase resistance to bending. The cutting end is in the form of an inverted vee, the point on the rotational axis of the drill. The sides (13) of the vee are provided with a cutting rake and clearance and the cut commences at the periphery of the hole.
FR7705521A 1977-02-25 1977-02-25 Drill bit for brick and concrete - has two to four lobes with inverted vee point to commence cutting at periphery Withdrawn FR2381512A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7705521A FR2381512A1 (en) 1977-02-25 1977-02-25 Drill bit for brick and concrete - has two to four lobes with inverted vee point to commence cutting at periphery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7705521A FR2381512A1 (en) 1977-02-25 1977-02-25 Drill bit for brick and concrete - has two to four lobes with inverted vee point to commence cutting at periphery

Publications (1)

Publication Number Publication Date
FR2381512A1 true FR2381512A1 (en) 1978-09-22

Family

ID=9187228

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7705521A Withdrawn FR2381512A1 (en) 1977-02-25 1977-02-25 Drill bit for brick and concrete - has two to four lobes with inverted vee point to commence cutting at periphery

Country Status (1)

Country Link
FR (1) FR2381512A1 (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE66580C (en) * TH. höfer in Hamburg, Jacobikirchhof 31 Drill with three cutting edges
US1336006A (en) * 1919-05-22 1920-04-06 Weathersby Fred Richard Drill
GB540073A (en) * 1940-07-22 1941-10-03 Ferranti Ltd Improvements in or relating to metal drills
GB556308A (en) * 1942-03-23 1943-09-29 John Grier An improved boring or drilling tool
US2660075A (en) * 1950-12-11 1953-11-24 Hayden Twist Drill Company Expansible drill
GB842133A (en) * 1957-12-04 1960-07-20 Wickman Ltd Metal cutting tools
US3076357A (en) * 1961-08-21 1963-02-05 Erickson Tool Co Spade drill blade
FR2268590A1 (en) * 1974-04-26 1975-11-21 Krupp Gmbh Hard metal drilling plate on shaft holder - has twin central, main intermediary and adjacent cutting surfaces

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE66580C (en) * TH. höfer in Hamburg, Jacobikirchhof 31 Drill with three cutting edges
US1336006A (en) * 1919-05-22 1920-04-06 Weathersby Fred Richard Drill
GB540073A (en) * 1940-07-22 1941-10-03 Ferranti Ltd Improvements in or relating to metal drills
GB556308A (en) * 1942-03-23 1943-09-29 John Grier An improved boring or drilling tool
US2660075A (en) * 1950-12-11 1953-11-24 Hayden Twist Drill Company Expansible drill
GB842133A (en) * 1957-12-04 1960-07-20 Wickman Ltd Metal cutting tools
US3076357A (en) * 1961-08-21 1963-02-05 Erickson Tool Co Spade drill blade
FR2268590A1 (en) * 1974-04-26 1975-11-21 Krupp Gmbh Hard metal drilling plate on shaft holder - has twin central, main intermediary and adjacent cutting surfaces

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Legal Events

Date Code Title Description
ST Notification of lapse