EP2095905A2 - Schärfvorrichtung, insbesondere für Bohrspitzen - Google Patents

Schärfvorrichtung, insbesondere für Bohrspitzen Download PDF

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Publication number
EP2095905A2
EP2095905A2 EP09151927A EP09151927A EP2095905A2 EP 2095905 A2 EP2095905 A2 EP 2095905A2 EP 09151927 A EP09151927 A EP 09151927A EP 09151927 A EP09151927 A EP 09151927A EP 2095905 A2 EP2095905 A2 EP 2095905A2
Authority
EP
European Patent Office
Prior art keywords
sharpening
bit
sharpened
registration
mandrel
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.)
Withdrawn
Application number
EP09151927A
Other languages
English (en)
French (fr)
Other versions
EP2095905A3 (de
Inventor
Nicola Berni
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 EP2095905A2 publication Critical patent/EP2095905A2/de
Publication of EP2095905A3 publication Critical patent/EP2095905A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
    • B24B3/54—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of hand or table knives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
    • B24B3/247—Supports for drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
    • B24B3/52—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of shear blades or scissors

Definitions

  • the present invention relates to a sharpening apparatus, particularly for drilling bits.
  • sharpening apparatuses in particular for sharpening drilling bits, are already commercially available and use a grinding wheel supported by a shaft that is turned and against which the bit to be sharpened is positioned.
  • the aim of the present invention is to solve the problems noted above by providing a sharpening apparatus, particularly for drilling bits, that allows to prearrange the positioning of the bit with respect to the grinding wheel, with the advantage of always achieving an optimum rake angle as regards sharpening of the cutting edge.
  • an object of the invention is to provide an apparatus which, besides sharpening drilling bits, is capable of sharpening blades, blades of tools, and blades of scissors, being able to combine in a single element a plurality of different functionalities.
  • Another object of the invention is to provide a sharpening apparatus, particularly for drilling bits, which thanks to its particular constructive characteristics is capable of giving the greatest assurances of reliability and safety in use.
  • a sharpening apparatus particularly for drilling bits, according to the invention, comprising, within the containment enclosure, a frustum-shaped grinding wheel, which is connected to a shaft turned by motor means, characterized in that it comprises, on said containment enclosure, a registration assembly for the axial positioning of a bit to be sharpened in a supporting mandrel, there being also, on said containment enclosure, a sharpening seat for accommodating said supporting mandrel with a presettable positioning angle of the sharp edge of the bit to be sharpened with respect to said frustum-shaped grinding wheel.
  • the sharpening apparatus particularly for drilling bits, generally designated by the reference numeral 1, comprises a containment enclosure 2, which is constituted by a container body 3 onto which a cover 4 is applied.
  • a frustum-shaped grinding wheel 10 is provided inside the container body and is connected to a shaft 11, which is turned by motor means constituted by an electric motor 12 connected to the shaft 11 by means of a conventional belt 13.
  • a peculiarity of the sharpening apparatus according to the invention consists in that on the same shaft 11 a first pair of front grinding wheels 15 and a second pair of front grinding wheels 16 are provided, which are mutually laterally adjacent and are pushed elastically by a compaction spring 17.
  • a registration assembly is provided, generally designated by the reference numeral 20, which has a collar 21 in which it is possible to insert a supporting mandrel, generally designated by the reference numeral 22.
  • the supporting mandrel 22 has a body 23 to which a ring 24 is connected for adjusting the radial positioning of laminas 25 that fasten the bit, generally designated by the reference numeral 26.
  • the mandrel further has, in its rear portion, a containment region, designated by the reference numeral 27, in which it is possible to insert registration elements or abutments 28, which are kept in position by a plug 29.
  • the registration elements 28 can be arranged, as a function of the diameter of the bit to be sharpened, on a front shank 30 of the supporting mandrel, which is provided with abutment notches 31 for the angular positioning of the abutments 28.
  • the registration elements 28 are provided axially with a cam-like shape 32, with two inclined ramps that are designed, as will become better apparent hereinafter, to determine the axial penetration of the bit to be sharpened.
  • the registration assembly 20 has an abutment pad 40, which is connected to a threaded shank 41 that can be engaged in a threaded seat 42.
  • An actuation knob 43 is connected to the threaded shank 41, and reference markings 44 are arranged thereon which correspond to the diameter of the bit and can be arranged so as to be aligned with a registration or abutment notch 45, which is arranged on a slider 46 that is designed to divaricate the positioning laminas 47 that engage the bit, so as to turn it to arrange the cutting edge on a preset plane.
  • the mandrel 22, with the corresponding bit arranged axially, is inserted in a sharpening seat, designated by the reference numeral 50 and provided on the cover 4, which is arranged so as to be angularly inclined, with respect to the horizontal axis of the shaft 11, both on a vertical plane and on a horizontal plane, as clearly shown in the sectional views taken on the horizontal and vertical planes.
  • first and second pair of grinding wheels 15 and 16 there are provided a first slot 60 for the insertion of the blades of knives and a second slot 61 for the insertion of the blades of tools, farming equipment and the like.
  • a front slot 62 is also provided, which is arranged at the axial base of the first pair of grinding wheels 15 that allows the sharpening of the blades of scissors.
  • the registration element 28 is first applied to the mandrel 22 that corresponds to the diameter of the bit, and then the mandrel 22 is inserted in the collar 21 with the bit 26 held loose inside it, so that it can abut against the pad 40, and so that by releasing the slider 46 it is possible to turn the bit, by means of the positioning laminas 47, so as to arrange the cutting edge on a preset plane.
  • the bit is locked on the mandrel by turning the ring that supports the laminas 25 so as to lock the bit.
  • the supporting mandrel is removed and, after actuating the motor, the bit is inserted, with the selected registration element applied thereto, in the sharpening seat 50, and a clockwise rotation is performed first on one side and then on the opposite side, taking care to turn both sides a same number of times.
  • the apparatus described above also allows to sharpen blades of tools and farming equipment, and in this case the second slot 61 is used by inserting the blade between the second pair of grinding wheels 16 and taking care to pull the blade toward oneself in order to perform sharpening.
  • knives are inserted in the first slot 60, between the first pair of blades, performing perfect sharpening.
  • Another important aspect of the invention consists in that sharpening of bits is performed precisely and repetitively, allowing to always obtain the correct rake angle.
  • the materials used may be any according to requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP09151927.2A 2008-02-27 2009-02-03 Schärfvorrichtung, insbesondere für Bohrspitzen Withdrawn EP2095905A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20080317 ITMI20080317A1 (it) 2008-02-27 2008-02-27 Apparecchiatura per l'affilatura in particolare di punte a forare.

Publications (2)

Publication Number Publication Date
EP2095905A2 true EP2095905A2 (de) 2009-09-02
EP2095905A3 EP2095905A3 (de) 2013-09-25

Family

ID=40291709

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09151927.2A Withdrawn EP2095905A3 (de) 2008-02-27 2009-02-03 Schärfvorrichtung, insbesondere für Bohrspitzen

Country Status (2)

Country Link
EP (1) EP2095905A3 (de)
IT (1) ITMI20080317A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMO20100043A1 (it) * 2010-02-25 2011-08-26 Arti Tec Di Cavallini M E C S N C Gruppo di affilatura polifunzionale
CN105517757A (zh) * 2013-06-26 2016-04-20 埃奇克拉夫特公司 组合锐磨具组件
CN108296948A (zh) * 2017-01-13 2018-07-20 苏州宝时得电动工具有限公司 打磨机
CN110509127A (zh) * 2019-09-24 2019-11-29 方大控股有限公司 一种合金钻头打磨装置以及工艺

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9017825D0 (en) * 1990-08-11 1990-09-26 Martek Ltd A multiple purpose sharpening tool
US6676494B1 (en) * 2003-06-11 2004-01-13 Chuan-Chien Ching Drill bit grinder structure
US20060205328A1 (en) * 2005-03-14 2006-09-14 Ming-Ko Liao Dual-head grinding drill machine and grinding method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMO20100043A1 (it) * 2010-02-25 2011-08-26 Arti Tec Di Cavallini M E C S N C Gruppo di affilatura polifunzionale
CN105517757A (zh) * 2013-06-26 2016-04-20 埃奇克拉夫特公司 组合锐磨具组件
CN108296948A (zh) * 2017-01-13 2018-07-20 苏州宝时得电动工具有限公司 打磨机
CN110509127A (zh) * 2019-09-24 2019-11-29 方大控股有限公司 一种合金钻头打磨装置以及工艺

Also Published As

Publication number Publication date
ITMI20080317A1 (it) 2009-08-28
EP2095905A3 (de) 2013-09-25

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