GB639490A - Center drilling tool - Google Patents

Center drilling tool

Info

Publication number
GB639490A
GB639490A GB2738/48A GB273848A GB639490A GB 639490 A GB639490 A GB 639490A GB 2738/48 A GB2738/48 A GB 2738/48A GB 273848 A GB273848 A GB 273848A GB 639490 A GB639490 A GB 639490A
Authority
GB
United Kingdom
Prior art keywords
countersink
socket
drilling tool
center drilling
bore
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
GB2738/48A
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 GB639490A publication Critical patent/GB639490A/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
    • B23B51/10—Bits for countersinking
    • B23B51/108—Bits for countersinking having a centering drill

Landscapes

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

Abstract

639,490. Drills. THUNE, T. Jan. 29, 1948, No. 2738. Convention date, Feb. 1, 1947. [Class 83 (iii)] A centre drill 9 is adjustably fitted in a countersink 5 by means of a socket 1 of which the lower portion is tapered and slotted and fits in a corresponding tapered bore in the countersink so that it grips the drill. The upper end of the bore of the countersink may be screwthreaded at 8 to engage corresponding screw-threads on the socket, or the countersink may be held on the socket solely by the frictional engagement between the conical surfaces.
GB2738/48A 1947-02-01 1948-01-29 Center drilling tool Expired GB639490A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO262858X 1947-02-01

Publications (1)

Publication Number Publication Date
GB639490A true GB639490A (en) 1950-06-28

Family

ID=19905069

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2738/48A Expired GB639490A (en) 1947-02-01 1948-01-29 Center drilling tool

Country Status (4)

Country Link
BE (1) BE480066A (en)
CH (1) CH262858A (en)
FR (1) FR960118A (en)
GB (1) GB639490A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2898787A (en) * 1957-03-04 1959-08-11 William J Hofbauer Rotary cutting tool
EP0872297A1 (en) * 1997-03-18 1998-10-21 HILTI Aktiengesellschaft Combination drilling tool

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1273301B (en) * 1960-08-10 1968-07-18 Alfons Klos Countersink tool that can be placed on a twist drill

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2898787A (en) * 1957-03-04 1959-08-11 William J Hofbauer Rotary cutting tool
EP0872297A1 (en) * 1997-03-18 1998-10-21 HILTI Aktiengesellschaft Combination drilling tool
US6073710A (en) * 1997-03-18 2000-06-13 Hilti Aktiengesellschaft Combination drilling member

Also Published As

Publication number Publication date
BE480066A (en)
CH262858A (en) 1949-07-31
FR960118A (en) 1950-04-13

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