GB776028A - Drill bits - Google Patents

Drill bits

Info

Publication number
GB776028A
GB776028A GB444555A GB444555A GB776028A GB 776028 A GB776028 A GB 776028A GB 444555 A GB444555 A GB 444555A GB 444555 A GB444555 A GB 444555A GB 776028 A GB776028 A GB 776028A
Authority
GB
United Kingdom
Prior art keywords
auger
thread
conical portion
drill bits
head
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
GB444555A
Inventor
John Mervyn Perkins
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.)
John M Perkins & Smith Ltd
Original Assignee
John M Perkins & Smith Ltd
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 John M Perkins & Smith Ltd filed Critical John M Perkins & Smith Ltd
Priority to GB444555A priority Critical patent/GB776028A/en
Publication of GB776028A publication Critical patent/GB776028A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
    • B28D1/146—Tools therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)

Abstract

776,028. Drills. PERKINS & SMITH, Ltd., J. M. Nov. 4, 1955 [Feb. 15, 1955], No. 4445/55. Class 83 (3). A drill bit comprises an annular head with two or more radiallyspaced teeth 15, a cylindrical portion 7 having an auger-thread 8, a rearwardly tapering truncated conical portion 9, and a shank 11, the bit having a bore 13 extending at an angle to its axis, from the head to an opening 14 in the conical portion. A threaded part 12 enables an extension rod to be attached. A hole 16 in the auger thread assists in breaking up the material removed.
GB444555A 1955-02-15 1955-02-15 Drill bits Expired GB776028A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB444555A GB776028A (en) 1955-02-15 1955-02-15 Drill bits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB444555A GB776028A (en) 1955-02-15 1955-02-15 Drill bits

Publications (1)

Publication Number Publication Date
GB776028A true GB776028A (en) 1957-05-29

Family

ID=9777316

Family Applications (1)

Application Number Title Priority Date Filing Date
GB444555A Expired GB776028A (en) 1955-02-15 1955-02-15 Drill bits

Country Status (1)

Country Link
GB (1) GB776028A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1602003B1 (en) * 1966-06-08 1971-03-11 Netherlands Tool Mfg Co Rock drill
US4130170A (en) * 1977-02-07 1978-12-19 Barymin Explorations Limited Probe for use in geological surveys
FR2416103A1 (en) * 1978-02-07 1979-08-31 Nielsen Mogens METHOD AND TOOL FOR MAKING A HOLE IN REINFORCED CONCRETE
FR2589943A1 (en) * 1985-11-14 1987-05-15 Duss Maschf Rotary percussive twist drill
GB2212091A (en) * 1987-11-12 1989-07-19 Boart Hardmetals Drilling equipment

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1602003B1 (en) * 1966-06-08 1971-03-11 Netherlands Tool Mfg Co Rock drill
US4130170A (en) * 1977-02-07 1978-12-19 Barymin Explorations Limited Probe for use in geological surveys
FR2416103A1 (en) * 1978-02-07 1979-08-31 Nielsen Mogens METHOD AND TOOL FOR MAKING A HOLE IN REINFORCED CONCRETE
FR2589943A1 (en) * 1985-11-14 1987-05-15 Duss Maschf Rotary percussive twist drill
GB2212091A (en) * 1987-11-12 1989-07-19 Boart Hardmetals Drilling equipment
GB2212091B (en) * 1987-11-12 1992-01-22 Boart Hardmetals Drilling equipment

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