GB454916A - Improvements in twist drills - Google Patents

Improvements in twist drills

Info

Publication number
GB454916A
GB454916A GB14061/36A GB1406136A GB454916A GB 454916 A GB454916 A GB 454916A GB 14061/36 A GB14061/36 A GB 14061/36A GB 1406136 A GB1406136 A GB 1406136A GB 454916 A GB454916 A GB 454916A
Authority
GB
United Kingdom
Prior art keywords
drill
edge
twist
twist drills
aegidigasse
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
GB14061/36A
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
Publication of GB454916A publication Critical patent/GB454916A/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
    • B23B51/02—Twist drills
    • 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

454,916. Twist drills. LACKNER, E., 2, Aegidigasse, Vienna. May 18, 1936, No. 14061. Convention date, May 20, 1935. [Class 83 (iii)] A twist drill has two cutting edges connected by a central edge 2, each cutting edge having a slightly concave outer section 4, and an inner straight line portion 6 lying substantially in the line 7, 8, joining the ends of the edge so that an obtuse angle is left at the intersection 5. In some cases the part 6 may be slightly convex. The drill may be made by grinding away the part 4 from an ordinary drill, but is preferably made from a rod having spiral flutes 9, of the required section throughout.
GB14061/36A 1935-05-20 1936-05-18 Improvements in twist drills Expired GB454916A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT454916X 1935-05-20

Publications (1)

Publication Number Publication Date
GB454916A true GB454916A (en) 1936-10-09

Family

ID=3674472

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14061/36A Expired GB454916A (en) 1935-05-20 1936-05-18 Improvements in twist drills

Country Status (4)

Country Link
BE (2) BE415644A (en)
DE (1) DE709460C (en)
FR (1) FR806621A (en)
GB (1) GB454916A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2521468A1 (en) * 1982-02-12 1983-08-19 Bilz Hermann Gmbh & Co FOREST
WO1997004908A1 (en) * 1995-07-27 1997-02-13 Mays Ralph C Drill bit
FR2757432A1 (en) * 1996-12-24 1998-06-26 Spit Soc Prospect Inv Techn Drill bit with insert tip for drilling masonry
US8979445B2 (en) 2010-10-15 2015-03-17 Hanita Metal Factory Ltd Cutting tip and rotary cutting tool employing same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2521468A1 (en) * 1982-02-12 1983-08-19 Bilz Hermann Gmbh & Co FOREST
WO1997004908A1 (en) * 1995-07-27 1997-02-13 Mays Ralph C Drill bit
US5947659A (en) * 1995-07-27 1999-09-07 Mays; Ralph C. Drill bit
FR2757432A1 (en) * 1996-12-24 1998-06-26 Spit Soc Prospect Inv Techn Drill bit with insert tip for drilling masonry
US8979445B2 (en) 2010-10-15 2015-03-17 Hanita Metal Factory Ltd Cutting tip and rotary cutting tool employing same
GB2484597B (en) * 2010-10-15 2015-10-14 Kennametal Inc Rotary cutting tool and cutting tip with variable profile

Also Published As

Publication number Publication date
BE415644A (en)
BE415844A (en)
FR806621A (en) 1936-12-21
DE709460C (en) 1941-08-16

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