GB633938A - Improvements in drills - Google Patents

Improvements in drills

Info

Publication number
GB633938A
GB633938A GB454748A GB454748A GB633938A GB 633938 A GB633938 A GB 633938A GB 454748 A GB454748 A GB 454748A GB 454748 A GB454748 A GB 454748A GB 633938 A GB633938 A GB 633938A
Authority
GB
United Kingdom
Prior art keywords
drill
blade
axis
drills
incoincident
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
GB454748A
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.)
HERBERT FREDERICK PEARCE
Original Assignee
HERBERT FREDERICK PEARCE
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 HERBERT FREDERICK PEARCE filed Critical HERBERT FREDERICK PEARCE
Priority to GB454748A priority Critical patent/GB633938A/en
Publication of GB633938A publication Critical patent/GB633938A/en
Expired 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
    • B23B2251/40—Flutes, i.e. chip conveying grooves
    • B23B2251/406—Flutes, i.e. chip conveying grooves of special form not otherwise provided for

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)

Abstract

633,938. Drilling-bits. PEARCE, H. F. Feb. 17, 1948, Nos. 4547, 26352 and 31587. [Class 83 (iii)] A drill comprises a semi-cylindrical blade 1 formed at its end with two plane or concave surfaces 2, 3 of unequal area convergently merging in an intermediate ridge 4 which is inclined to the axis of the drill and presents a centring point 5 coincident or incoincident with the axis of the drill. One of the blade edges may be chamfered. The blade may be longitudinally furrowed.
GB454748A 1948-02-17 1948-02-17 Improvements in drills Expired GB633938A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB454748A GB633938A (en) 1948-02-17 1948-02-17 Improvements in drills

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB454748A GB633938A (en) 1948-02-17 1948-02-17 Improvements in drills

Publications (1)

Publication Number Publication Date
GB633938A true GB633938A (en) 1949-12-30

Family

ID=9779217

Family Applications (1)

Application Number Title Priority Date Filing Date
GB454748A Expired GB633938A (en) 1948-02-17 1948-02-17 Improvements in drills

Country Status (1)

Country Link
GB (1) GB633938A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3093028A (en) * 1959-02-05 1963-06-11 Eaton Mfg Co Self-drilling and self-tapping threaded fastener
US3682038A (en) * 1968-10-23 1972-08-08 Bultfabriks Ab Self-tapping screw with drill means
DE3018579A1 (en) * 1979-05-15 1980-11-20 Koei Engraving Industry Co Tool for cutting narrow slots and grooves - is made from round bar with flat tapered surface at angle to bar
WO2001017736A1 (en) * 1999-09-07 2001-03-15 The Rawlplug Company Limited Hole-forming tool

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3093028A (en) * 1959-02-05 1963-06-11 Eaton Mfg Co Self-drilling and self-tapping threaded fastener
US3682038A (en) * 1968-10-23 1972-08-08 Bultfabriks Ab Self-tapping screw with drill means
DE3018579A1 (en) * 1979-05-15 1980-11-20 Koei Engraving Industry Co Tool for cutting narrow slots and grooves - is made from round bar with flat tapered surface at angle to bar
WO2001017736A1 (en) * 1999-09-07 2001-03-15 The Rawlplug Company Limited Hole-forming tool

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