GB280416A - An improved twist drill, and method of manufacturing the same - Google Patents

An improved twist drill, and method of manufacturing the same

Info

Publication number
GB280416A
GB280416A GB598727A GB598727A GB280416A GB 280416 A GB280416 A GB 280416A GB 598727 A GB598727 A GB 598727A GB 598727 A GB598727 A GB 598727A GB 280416 A GB280416 A GB 280416A
Authority
GB
United Kingdom
Prior art keywords
oblique faces
drill
ground
longitudinal axis
grinding wheels
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
GB598727A
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.)
Rawlplug Co Ltd
Original Assignee
Rawlplug Co 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 Rawlplug Co Ltd filed Critical Rawlplug Co Ltd
Priority to GB598727A priority Critical patent/GB280416A/en
Publication of GB280416A publication Critical patent/GB280416A/en
Priority to FR648426D priority patent/FR648426A/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
    • B23B2251/24—Overall form of drilling tools
    • B23B2251/241—Cross sections of the diameter of the drill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/46—Drills having a centre free from cutting edges or with recessed cutting edges

Landscapes

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

Abstract

280,416. Rawlings, J. J., and Rawlplug Co., Ltd. March 3, 1927, Drills.-A twist driil or bit more particularly for boring holes for screws, nails &c. in stone, cement, brick &c. is formed from a metal strip having its longitudinal edges of greater thickness than the central part, which metal strip is twisted helically about its longitudinal axis, ground at one or both ends to form oblique faces lying ir planes intersecting on a line at right angles to the longitudinal axis and slit axially at one or both ends to form a gap between the oblique faces. The twisted strip a is cut into drill lengths and the sections placed in a holder and fed past grinding wheels, milling cutters &c. to form the oblique faces b and past a circular saw or other tool to form the axial slot e ; by duplicating the grinding wheels &c. both ends of the drill may be ground and slotted simultaneously.
GB598727A 1927-03-03 1927-03-03 An improved twist drill, and method of manufacturing the same Expired GB280416A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB598727A GB280416A (en) 1927-03-03 1927-03-03 An improved twist drill, and method of manufacturing the same
FR648426D FR648426A (en) 1927-03-03 1928-02-04 Advanced drills and their manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB598727A GB280416A (en) 1927-03-03 1927-03-03 An improved twist drill, and method of manufacturing the same

Publications (1)

Publication Number Publication Date
GB280416A true GB280416A (en) 1927-11-17

Family

ID=9806328

Family Applications (1)

Application Number Title Priority Date Filing Date
GB598727A Expired GB280416A (en) 1927-03-03 1927-03-03 An improved twist drill, and method of manufacturing the same

Country Status (2)

Country Link
FR (1) FR648426A (en)
GB (1) GB280416A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011066831A3 (en) * 2009-12-03 2011-07-28 Bauer Drill I/S A rotary drill

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011066831A3 (en) * 2009-12-03 2011-07-28 Bauer Drill I/S A rotary drill
CN102834211A (en) * 2009-12-03 2012-12-19 鲍尔钻孔公司 A rotary drill
US9132571B2 (en) 2009-12-03 2015-09-15 Bauer Drill I/S Rotary drill
CN102834211B (en) * 2009-12-03 2016-07-06 鲍尔钻孔公司 Rotary drill

Also Published As

Publication number Publication date
FR648426A (en) 1928-12-10

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