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WO2001010587A1 - Trepans - Google Patents

Trepans Download PDF

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Publication number
WO2001010587A1
WO2001010587A1 PCT/ZA1999/000066 ZA9900066W WO0110587A1 WO 2001010587 A1 WO2001010587 A1 WO 2001010587A1 ZA 9900066 W ZA9900066 W ZA 9900066W WO 0110587 A1 WO0110587 A1 WO 0110587A1
Authority
WO
WIPO (PCT)
Prior art keywords
bit
drill bit
drill
cutting
cutting edges
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.)
Ceased
Application number
PCT/ZA1999/000066
Other languages
English (en)
Inventor
Andre Jurgens
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 AU62992/99A priority Critical patent/AU6299299A/en
Priority to PCT/ZA1999/000066 priority patent/WO2001010587A1/fr
Publication of WO2001010587A1 publication Critical patent/WO2001010587A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B23B51/009—Stepped drills

Definitions

  • the present invention lies in the field of machine tools, in particular drill bits for drilling.
  • the invention covers the scope of bits for drilling in all materials and all types of rotary drill bit designs.
  • drill bits commonly called twist drill bits have a helical spiral form with cutting edges at the cutting end of the bit, with flutes between helical edges providing for the passage of drill scarf up the shaft of the drill towards the chuck end during cutting, so as to clear the hole.
  • the cutting edges are angled at an angle to the longitudinal axis of the bit which is less than ninety degrees, so that the rotating edges cut a conical base to the hole being drilled. This has the effect of centring the bit to restrict a tendency to wander.
  • the bit may be re-sharpened many times, until the bit becomes too short for convenient use.
  • Such drills are used for drilling in metals and other materials and are widely used.
  • Wood drill bits suitable also for other materials of similar hardness and strength, also have a helical shape with flutes for clearing the scarf, though often the cutting edges are orthogonal to the longitudinal axis of the bit and a lead-in screw thread is provided at the end of the bit on the bit axis to give the centring action and also draw the bit into the work.
  • drill bits for wood and similar materials comprise merely a flat butterfly wings at the end of a shaft and having no helical form, presenting cutting edges at the forward edges of the flat wings and having a tip at the cutting end of the bit on the longitudinal axis to give a centring action.
  • the shaft is usually smaller in diameter than the diameter of the hole cut by the edges on the wings, so as to allow space for the scarf to be cleared from the hole.
  • Masonry drill bits commonly used are like twist drills, but are characterised by inserts of hardened material at the cutting edges, such as tungsten carbide, for example.
  • a drill bit in accordance with this invention comprises a chuck end of the bit, a shaft, cutting edges at a cutting end of the bit, and a means at the cutting end of centring, characterised in that additional cutting edges are provided at least at one further position on the bit between the cutting end and the chuck end, and that the additional cutting edges are dimensioned to cut a larger diameter than the cutting edges at the cutting end.
  • the drill bit is made integrally, from a single piece of metal.
  • the drill bit is made as a composite product, where a portion of smaller diameter is set into a bore provided in a portion of larger diameter.
  • the portions can, for example, be braised together or bonded in another analogous way.
  • a portion of smaller diameter can be fitted into a bore with the outer surfaces of the smaller portion and the inner surfaces of the larger portion having matching splines, or analogous formations, even a keyed connection, for example. Manufacturing considerations may be a prime basis for a choice between these options.
  • the portions which fit one into another may be made so that the depth to which a smaller diameter portion penetrates into a larger diameter portion is adjustable.
  • a smaller portion may be slideable on splines into the larger diameter portion, with a grub screw or other means of locking the portion at a selected depth.
  • the smaller portion may be slid into a bore of the portion of larger diameter, which bore has helical formations of the same dimensions and pitch as those outside the portion of smaller diameter and fixed by brazing or by grub screws or other means of setting an adjustable position.
  • Drills according to the invention have at least two advantages. They allow a collection of fewer drill bits to be kept while still catering for a good incremental range of holes that can be drilled. They allow holes to be drilled, e.g. in difficult material with a lead hole of smaller diameter, followed by one or more enlargements of the hole diameter, without changing the bit.
  • the present invention further provides a set of drill bits of the kind described, each drill bit providing at least two sizes, preferably three sizes.
  • Reference to sizes is to the sizes of holes that can be cut with the bit, according to the cutting edges at the cutting end and the additional cutting edges provided.
  • a method of drilling in accordance with the invention comprises using a drill bit according to the invention and feeding the bit into the work to a selected depth, according to the size of hole required to be drilled, within the range provided by the single drill bit.
  • An NC machine can be programmed to drill to the required distance of the bit, to give the required size of hole.
  • the length of drill bit between the cutting edges at the cutting end and the additional bits is selected according to a depth of hole required to be cut by the bit at a selected size.
  • the invention can be carried out fitting the drill bits to hand drills or electric or other powered drilling machines, according to the requirements of different applications. BRIEF DESCRIPTION OF THE DRAWINGS
  • the drill bit comprises a helical fluted bit of three diameters, as indicated at 1 , 2 and 3.
  • the chuck end 4 of the bit is in this example of reduced size to permit fitting in a smaller drill chuck.
  • the shaft 5 has the helical flutes 6 in it, in this type of bit.
  • the cutting end 7 of the bit has cutting edges there and in accordance with the invention additional cutting edges 8 and 9 are provided at two further positions, dimensioned to cut larger diameter holes.
  • the drill bit can be made by the portion of diameter 1 set into a bore in the portion of diameter 2 which in turn is set into the portion of diameter 3, the portions brazed together. Heat treatment follows after the brazing step.
  • the flutes 6 in this example run continuously with the flutes in each portion synchronised so as to run into the next at the transitions from one size to the next.
  • the lengths 1 0, 1 1 and 1 2 of each portion of the drill bit can be selected according to the depth to which the hole is required to be drilled in each size.
  • An NC machine which uses such bits can have these length dimensions and diameters programmed into it, to allow correct indexing of the bits to required applications.

Landscapes

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

Abstract

Ce trépan comprend une extrémité du type mandrin (4), un axe (5), des bords coupants au niveau de l'extrémité coupante (7) du trépan, ainsi que des moyens de centrage, au niveau de cette extrémité coupante, et il est caractérisé en ce que des bords coupants supplémentaires sont ménagés au moins au niveau d'une autre position, sur le trépan, entre l'extrémité coupante et le mandrin, et en ce que ces bords coupants supplémentaires sont dimensionnés pour découper un diamètre supérieur à celui découpé par les bords coupants de l'extrémité coupante. On peut utiliser ce trépan pour forer un diamètre choisi parmi plusieurs diamètres, en fonction du nombre de bords coupants supplémentaires. De manière générale, trois diamètres de coupe sont prévus.
PCT/ZA1999/000066 1999-08-11 1999-08-11 Trepans Ceased WO2001010587A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU62992/99A AU6299299A (en) 1999-08-11 1999-08-11 Drill bits
PCT/ZA1999/000066 WO2001010587A1 (fr) 1999-08-11 1999-08-11 Trepans

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/ZA1999/000066 WO2001010587A1 (fr) 1999-08-11 1999-08-11 Trepans

Publications (1)

Publication Number Publication Date
WO2001010587A1 true WO2001010587A1 (fr) 2001-02-15

Family

ID=25587496

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA1999/000066 Ceased WO2001010587A1 (fr) 1999-08-11 1999-08-11 Trepans

Country Status (2)

Country Link
AU (1) AU6299299A (fr)
WO (1) WO2001010587A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2419555A (en) * 2004-10-28 2006-05-03 G & J Hall Ltd Stepped drill bit
US20130189044A1 (en) * 2012-01-23 2013-07-25 LaVerne R. Durfee Step drill for wood
CN103658704A (zh) * 2013-12-05 2014-03-26 周世军 用于制作阶梯形锥孔机筒的加工刀具
US9731358B2 (en) 2013-06-06 2017-08-15 Milwaukee Electric Tool Corporation Step drill bit
WO2018011314A1 (fr) * 2016-07-14 2018-01-18 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG Foret étagé
WO2020206076A1 (fr) * 2019-04-04 2020-10-08 Miller Dowel Company Trépan étagé muni de bords aiguisés en alternance pour nettoyer des ouvertures de fixation masquées dans des joints en bois lamellé-croisé
US11260459B2 (en) 2020-04-30 2022-03-01 The Boeing Company Tools and methods for forming aligned holes from near full-sized holes
US11273501B2 (en) 2018-04-26 2022-03-15 Milwaukee Electric Tool Corporation Step drill bit
DE102023004996A1 (de) 2023-11-25 2025-05-28 Jovo Kojovic Stein-Bohrer

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB540073A (en) * 1940-07-22 1941-10-03 Ferranti Ltd Improvements in or relating to metal drills
US2389909A (en) * 1944-01-17 1945-11-27 Hofbauer Frank Rotary cutting tool
US4561812A (en) * 1981-10-12 1985-12-31 Linden Karl H Extensible drill
US4582458A (en) * 1984-08-09 1986-04-15 American Saw & Mfg. Company Stepped drill construction
US5326196A (en) * 1993-06-21 1994-07-05 Noll Robert R Pilot drill bit
US5466100A (en) * 1994-10-24 1995-11-14 Alfa Manufacturing Industries, Inc. Multi-stepped power drill bit having handle chuck adaptor
DE19526686A1 (de) * 1994-09-09 1996-03-14 Duerr Praezisionswerkzeuge Gmb Mehrstufenbohrer

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB540073A (en) * 1940-07-22 1941-10-03 Ferranti Ltd Improvements in or relating to metal drills
US2389909A (en) * 1944-01-17 1945-11-27 Hofbauer Frank Rotary cutting tool
US4561812A (en) * 1981-10-12 1985-12-31 Linden Karl H Extensible drill
US4582458A (en) * 1984-08-09 1986-04-15 American Saw & Mfg. Company Stepped drill construction
US5326196A (en) * 1993-06-21 1994-07-05 Noll Robert R Pilot drill bit
DE19526686A1 (de) * 1994-09-09 1996-03-14 Duerr Praezisionswerkzeuge Gmb Mehrstufenbohrer
US5466100A (en) * 1994-10-24 1995-11-14 Alfa Manufacturing Industries, Inc. Multi-stepped power drill bit having handle chuck adaptor

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2419555A (en) * 2004-10-28 2006-05-03 G & J Hall Ltd Stepped drill bit
US9156094B2 (en) * 2012-01-23 2015-10-13 Irwin Industrial Tool Company Step drill for wood
US20130189044A1 (en) * 2012-01-23 2013-07-25 LaVerne R. Durfee Step drill for wood
US10695845B2 (en) 2013-06-06 2020-06-30 Milwaukee Electric Tool Corporation Step drill bit
US9731358B2 (en) 2013-06-06 2017-08-15 Milwaukee Electric Tool Corporation Step drill bit
US12434308B2 (en) 2013-06-06 2025-10-07 Milwaukee Electric Tool Corporation Step drill bit
USD936117S1 (en) 2013-06-06 2021-11-16 Milwaukee Electric Tool Corporation Step drill bit
US10252351B2 (en) 2013-06-06 2019-04-09 Milwaukee Electric Tool Corporation Step drill bit
CN103658704A (zh) * 2013-12-05 2014-03-26 周世军 用于制作阶梯形锥孔机筒的加工刀具
US11077504B2 (en) 2016-07-14 2021-08-03 Mapal Fabrik Fur Prazisionswerkzeuge Dr. Kress Kg Step drill
CN109562463A (zh) * 2016-07-14 2019-04-02 克莱斯博士玛帕精密仪器工厂两合公司 阶梯钻
WO2018011314A1 (fr) * 2016-07-14 2018-01-18 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG Foret étagé
US11273501B2 (en) 2018-04-26 2022-03-15 Milwaukee Electric Tool Corporation Step drill bit
US11691203B2 (en) 2018-04-26 2023-07-04 Milwaukee Electric Tool Corporation Step drill bit
WO2020206076A1 (fr) * 2019-04-04 2020-10-08 Miller Dowel Company Trépan étagé muni de bords aiguisés en alternance pour nettoyer des ouvertures de fixation masquées dans des joints en bois lamellé-croisé
US11260459B2 (en) 2020-04-30 2022-03-01 The Boeing Company Tools and methods for forming aligned holes from near full-sized holes
GB2598655A (en) * 2020-04-30 2022-03-09 Boeing Co Tools and methods for forming aligned holes from near full-sized holes
GB2598655B (en) * 2020-04-30 2023-04-05 Boeing Co Tools and methods for forming aligned holes from near full-sized holes
DE102023004996A1 (de) 2023-11-25 2025-05-28 Jovo Kojovic Stein-Bohrer

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Publication number Publication date
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