GB260878A - Improvements in, and relating to, hollow drills - Google Patents

Improvements in, and relating to, hollow drills

Info

Publication number
GB260878A
GB260878A GB1292426A GB1292426A GB260878A GB 260878 A GB260878 A GB 260878A GB 1292426 A GB1292426 A GB 1292426A GB 1292426 A GB1292426 A GB 1292426A GB 260878 A GB260878 A GB 260878A
Authority
GB
United Kingdom
Prior art keywords
section
bar
twisting
drills
hollow
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
GB1292426A
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
Priority to GB1292426A priority Critical patent/GB260878A/en
Publication of GB260878A publication Critical patent/GB260878A/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
    • B23B51/06—Drills with lubricating or cooling equipment

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

260,878. Rayner, G. H. T., and Rayner, P. May 20, 1926. Drills. - Hollow spiral drills are made by twisting a hollow-section bar having at least three angles in a common circle embracing the maximum diameter of the bar, thus forming at least three flutes for the passage of debris and three points of contact with the walls of the hole being drilled. The bar may be of square section as shown in the Figure or may be triangular, pentagonal &c. or of star-section. The shank is formed by upsetting one end of the bar to the section required and the other end is pointed in the usual manner. The section may have straight sides which become concave after twisting, or the sides may be concave before twisting.
GB1292426A 1926-05-20 1926-05-20 Improvements in, and relating to, hollow drills Expired GB260878A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1292426A GB260878A (en) 1926-05-20 1926-05-20 Improvements in, and relating to, hollow drills

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1292426A GB260878A (en) 1926-05-20 1926-05-20 Improvements in, and relating to, hollow drills

Publications (1)

Publication Number Publication Date
GB260878A true GB260878A (en) 1926-11-11

Family

ID=10013616

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1292426A Expired GB260878A (en) 1926-05-20 1926-05-20 Improvements in, and relating to, hollow drills

Country Status (1)

Country Link
GB (1) GB260878A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2504601A (en) * 1947-12-30 1950-04-18 Earl M Spry Auger drill
US2876995A (en) * 1954-09-02 1959-03-10 Sr Francis M Neighly Percussion drills
US3205733A (en) * 1963-10-21 1965-09-14 Texaco Inc Spiral drill collar and method of manufacture thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2504601A (en) * 1947-12-30 1950-04-18 Earl M Spry Auger drill
US2876995A (en) * 1954-09-02 1959-03-10 Sr Francis M Neighly Percussion drills
US3205733A (en) * 1963-10-21 1965-09-14 Texaco Inc Spiral drill collar and method of manufacture thereof

Similar Documents

Publication Publication Date Title
GB231155A (en) Improvements in wood screws
GB260878A (en) Improvements in, and relating to, hollow drills
US2318326A (en) Rock drill
GB352888A (en) An improved nut
GB501331A (en) Improvements in stop devices for limiting the extent of movement of a boring tool orthe like
GB242834A (en) A ground anchor
GB305107A (en) Improvements in drilling jigs
DE1106144B (en) Twist drill
DE851332C (en) Core drill for deep drilling
GB212618A (en) Improvements in and relating to twist drills, reamers and the like tools
GB361908A (en) A device for extracting screws
GB410947A (en) Improvements in rock drills
GB191121558A (en) Improvements in and in the Manufacture of High Speed Twist Drills.
GB468999A (en) Improvements relating to percussive picks
DE326580C (en) Masonry bits for expanding boreholes
GB334340A (en) Improvements in or relating to sockets for twist and like drills
GB438705A (en) Improved split pin
DE637727C (en) Masonry drill
CH251322A (en) Impact drill for rock drilling.
DE403568C (en) Mouthpiece for tobacco pipes
GB324412A (en) Improvements in rock drills
DE670228C (en) Ski pole made from grown hollow tubes with foreign wood inlay
GB206761A (en) An improved percussion tool
GB250017A (en) Improvements in lead screws or nibs of augers, bits, and the like
GB539443A (en) Improvements in, and relating to, rock drills