US3224146A - Apparatus for grinding drills - Google Patents

Apparatus for grinding drills Download PDF

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Publication number
US3224146A
US3224146A US282296A US28229663A US3224146A US 3224146 A US3224146 A US 3224146A US 282296 A US282296 A US 282296A US 28229663 A US28229663 A US 28229663A US 3224146 A US3224146 A US 3224146A
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United States
Prior art keywords
drill
grinding
shaft
handle
centering
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Expired - Lifetime
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US282296A
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English (en)
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Ahlstrom Allan Eugen
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Individual
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Individual
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    • 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
    • B24B3/26—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills of the point of twist drills
    • B24B3/265—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills of the point of twist drills using devices specially adapted for domestic use

Definitions

  • the main feature of the invention is that the apparatus is adapted to be clamped on the drill to be ground which is e.g. chucked in a drilling machine, and the grinding apparatus is provided with devices for driving a grinding disk by means of the rotating drill with the disk resting against the operative end of the drill, the device being adapted to be held by a hand during the grinding.
  • the grinding apparatus comprises a telescoped central main shaft with a centering and clamping device for adjusting the drill to be ground, two grinding disks rotationally carried in the telescoped central main shaft and inclining towards each other with their peripheries touching each other at the axis of the adjusting and clamping means, one or several adjusting means adapted to engage the chip channels in the drill so as to ensure that the drill assumes the correct position relative to the telescoped central main shaft and thus also to the grinding disks so that the latter will be applied at the correct place of the operative surface of the drill, a handle at the lower portion of the apparatus to be held by the hand during the grinding and means adapted, at the rotation of the telescoped central mean shaft relative to the handle, to rotate the grinding disks abutting against the operative end of the drill clamped by the centering and clamping means so as to grind the drill edges.
  • Such an apparatus makes it possible to grind a drill chucked in the drilling machine quickly and easily. Thus, the drill does not have to be removed for being ground.
  • the use of the grinding apparatus according to the invention involves a considerable gain of time. The grinding can be carried out in some few seconds.
  • FIG. 1 is a side elevation, partly cut in the longitudinal direction, on an enlarged scale of a grinding apparatus according to the invention
  • FIGS. 2 and 3 show on an even more enlarged scale a cross section through the apparatus on the lines IIII and III-III, rsepectively, in FIG. 1.
  • 1 denotes a chuck of a drilling machine for chucking a twist drill 2.
  • the main parts of the grinding apparatus comprise a housing or cover shaped as a handle 3 adapted, during the grinding, to be held by the hand, and a teleseoped central main shaft 4 rotating relative to the cover, said shaft in the shown embodiment comprising an upper hollow inner portion 5 and a lower hollow outer portion 6 longitudinally movable relative to said upper portion 5.
  • the upper por tion 5 is provided at its top with a chuck 7 to hold the drill 2 in the portion 5.
  • Below the means 7 there is arranged a guiding means for ensuring that the drill will be brought in the correct position relative to the shaft 4 for being correctly ground.
  • Said guide means comprises according to the shown embodiment two pistons 9, 10 which are, diametrically opposite each other, radially movable in the body 8 of the means 7 and which are arranged in bores 11 in the body 8. Each bore is closed at the outer end by means of a screw 12. Between the “ice radially outer ends of the pistons 9, 1t) and the corresponding screw 12 there is clamped a helical spring 13 which presses the corresponding pistons 9 and 10, respectively, in such a way that at least one of the pistons with its inner end, shaped as a conical tenon 14 and 15, respectively, engages fixedly one of the chip channels 16 of the drill 2.
  • Two grinding disks 18, 19 are carried in the lower portion 6 on ball bearings 17 on lateral arms 33 on the portion 6 (only one shown in PG. 1), said disks 18, 19 being inclined with an angle corresponding to the inclination of the end surfaces 20 of the drill 2 at the operative end of the same.
  • a bevel gear wheel 22 is attached on each one of the shafts of the grinding disks 18, 19, said gear wheel 22 cooperating with a bevel gear wheel 23, the latter together with a somewhat larger bevel gear wheel 24 being journalled on an intermediary shaft 25 carried in the lower end of the portion 6.
  • Last mentioned gear wheel 24 cooperates with a gear ring 26 with inner teeth, said ring 26 arranged concentrically to the central shaft 4 and thus also with the longitudinal axis 27 of the drill 2.
  • a similar intermediary shaft 25 with gear wheels 23, 24 transmits via a gear wheel 22 and a shaft 21 the rotation to the grinding disk 18 (and similar to the grinding disk 19).
  • the grinding disks 18, 19 are carried and dimensioned in such a way that their peripheries touch each other at the axis 27.
  • the lower portion 6 is at its lower portion provided with a carrying tenon 28 by means of which the central shaft is journalled in the handle 3. The latter is preferably shaped in such a way that it can easily be held by one hand during the grinding operation.
  • the lower portion 6 extends at its upper portion through the upper portion of the handle and is rotationally carried in said upper portion.
  • the upper portion 5 is provided with a longitudinal groove 29 engaged by the inner end of a screw 30 in such a way that the lower portion 6 can be axially moved a small distance corresponding to the length of the groove 29.
  • a helical spring 31 which keeps the last mentioned portion with the handle 3 in its lower position in which the grinding disks 18 and 19 are situated at some distance below the operative end of the drill 2.
  • the grinding apparatus is from below put on the drill whereupon the automatically centering jaws of the centering and clamping means 7 are opened and automatically enclose and clamp the drill at its upper end in such a way that the axes 27 of the drill and the central shaft will coincide.
  • the apparatus is put on the drill simultaneously the conical tenon 14 or 15 on the pistons 9, 10 dimensioned for fitting the chip channels 16 in the drill 2 to be ground (as known, drills with varying dimensions have chip channels of varying sizes) are entered into these channels is ensured that the central shaft will assume the correct position relative to the drill 2, i.e.
  • the grinding disks 18, 19 will with their upper border surfaces be situated close to the axis 27 in front of the end surfaces on the operative end of the drill 2.
  • the drill 2 will drive the central shaft 4 with the same rotation speed as the one of the drill.
  • the gear ring 26 will remain stationary, the bevel gear wheel 24 will be forced to rotate while bringing along the gear wheel 23 which transmits the driving force to the gear wheel 22, the shaft 21 and the grinding disk 18 which thereby will be driven with a considerably higher speed than the one of the drill.
  • the disk 19 is true also for the disk 19.
  • the grinding apparatus can be put on the drill 2 and taken away from the same without even stopping the drill machine. Hereby the time for the grinding operation is further reduced.
  • roller bearings 17 should be enclosed in bearing halves which are easily removable from the portion 6 and after the replacement of the grinding disk again can be attached by means of screws (not shown in FIG. 1 but in FIG. 3).
  • a grinding apparatus for grinding a twist drill having at one end thereof faces having cutting edges, the drill being provided with chip channels: a hollow main shaft having lateral arms; a centering and clamping means for clamping the drill to be ground in said main shaft coaxial therewith; two inclined grinding disks rotatably carried on the arms of the shaft, the peripheries of said grinding disks close to each other near the axis of said centering and clamping means; at least one guiding means adapted to engage one of the chip channels of the drill to be ground for locating the drill correctly relative to said shaft and thus also relative to said grinding disks, the latter thereby being brought to contact the faces of the drill; a handle at the lower end of said shaft so that the apparatus can be held with one hand of the operator during the grinding operation; and means for, upon the rotation of the shaft relative to said handle, to rotate said grinding disks when the latter are in contact with the faces of the drill while the latter is clamped by said centering and clamping means so as to grind the cutting edges of said drill.
  • said guiding means comprising a spring loaded piston adapted to engage one of the chip channels in the drill to be ground with its radially outer end.
  • a grinding apparatus for a twist drill provided at one end thereof with faces forming a cutting end and having chip channels
  • a normally vertical hollow handle for a housing of generally circular horizontal cross section; a main central normally vertical hollowed shaft made up of telescoped inner and outer members mounted for rotation in the handle, the inner member extending upwardly from and out of the handle; a self centering chuck for holding a drill and fast on the upper end portion of inner member for centering the drill in the hollow of the shaft, said shaft portions being movable in the direction of their axis and means for limiting said movement, a spring about the inner portion and compressed between the chuck and outer portion, said outer portion being provided with two lateral arms and adjacent openings into the hollow of the outer portion, inclined rotary grinders carried on the respective arms and projecting through said openings to engage the cutting end of the drill, and gear means for rotating the grinders about their own axes when the main central shaft is rotated relative to the handle.
  • a grinding apparatus as claimed in claim 3 in which said chuck has thereunder and thereon a body provided with opposite nearly radial bores, spring loaded cylindrical positioning members having conical inner ends to engage in the chip channels of the drill for guiding the drill in the hollow of the central shaft when the drill is inserted therein.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
US282296A 1962-05-24 1963-05-22 Apparatus for grinding drills Expired - Lifetime US3224146A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE584362 1962-05-24

Publications (1)

Publication Number Publication Date
US3224146A true US3224146A (en) 1965-12-21

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ID=20267351

Family Applications (1)

Application Number Title Priority Date Filing Date
US282296A Expired - Lifetime US3224146A (en) 1962-05-24 1963-05-22 Apparatus for grinding drills

Country Status (5)

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US (1) US3224146A (de)
CH (1) CH406887A (de)
DK (1) DK109666C (de)
FI (1) FI40141C (de)
GB (1) GB1007544A (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3340651A (en) * 1963-12-06 1967-09-12 Ahlstrom Allan Eugen Apparatus for grinding drills
US3742652A (en) * 1970-03-06 1973-07-03 Black & Decker Mfg Co Drill sharpener
US3753320A (en) * 1967-05-03 1973-08-21 Intermedium Ag Apparatus for grinding drills
US3813822A (en) * 1972-05-08 1974-06-04 T Grob Web thinning machine
US3927600A (en) * 1972-04-24 1975-12-23 Chicago Rawhide Mfg Co Method of forming a molding core for use in forming a seal unit
US4325189A (en) * 1980-05-27 1982-04-20 Barber-Colman Company Method and apparatus for checking a gear
US4431351A (en) * 1979-05-23 1984-02-14 Barber-Colman Company Shape generation by orbiting a rotating shaping cutter
US4492136A (en) * 1981-12-18 1985-01-08 Walker Ronald I Cutting assembly system for pipe casings and the like
US4648209A (en) * 1985-04-02 1987-03-10 Toyo Machinery Co., Ltd. Small-sized drill grinding machine
US4850150A (en) * 1988-11-16 1989-07-25 Bishop Steven C Hand held drill with integral drill bit sharpener
US4869028A (en) * 1987-07-15 1989-09-26 Giles John E Methods for sharpening points
US4991355A (en) * 1987-07-15 1991-02-12 Giles John E Apparatus for sharpening points
US20120009853A1 (en) * 2010-07-06 2012-01-12 Western New England University Portable drill bit sharpener
US10712511B2 (en) 2017-05-18 2020-07-14 Senko Advanced Components, Inc. Optical connector with one-piece body

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2017532A (en) * 1933-10-11 1935-10-15 Nicholas J Elter Drill sharpening mechanism
US2177644A (en) * 1937-07-26 1939-10-31 Bruno Concato Drill sharpener

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2017532A (en) * 1933-10-11 1935-10-15 Nicholas J Elter Drill sharpening mechanism
US2177644A (en) * 1937-07-26 1939-10-31 Bruno Concato Drill sharpener

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3340651A (en) * 1963-12-06 1967-09-12 Ahlstrom Allan Eugen Apparatus for grinding drills
US3753320A (en) * 1967-05-03 1973-08-21 Intermedium Ag Apparatus for grinding drills
US3742652A (en) * 1970-03-06 1973-07-03 Black & Decker Mfg Co Drill sharpener
US3927600A (en) * 1972-04-24 1975-12-23 Chicago Rawhide Mfg Co Method of forming a molding core for use in forming a seal unit
US3813822A (en) * 1972-05-08 1974-06-04 T Grob Web thinning machine
US4431351A (en) * 1979-05-23 1984-02-14 Barber-Colman Company Shape generation by orbiting a rotating shaping cutter
US4325189A (en) * 1980-05-27 1982-04-20 Barber-Colman Company Method and apparatus for checking a gear
US4492136A (en) * 1981-12-18 1985-01-08 Walker Ronald I Cutting assembly system for pipe casings and the like
US4648209A (en) * 1985-04-02 1987-03-10 Toyo Machinery Co., Ltd. Small-sized drill grinding machine
US4869028A (en) * 1987-07-15 1989-09-26 Giles John E Methods for sharpening points
US4991355A (en) * 1987-07-15 1991-02-12 Giles John E Apparatus for sharpening points
US4850150A (en) * 1988-11-16 1989-07-25 Bishop Steven C Hand held drill with integral drill bit sharpener
US20120009853A1 (en) * 2010-07-06 2012-01-12 Western New England University Portable drill bit sharpener
US8690643B2 (en) * 2010-07-06 2014-04-08 Western New England University Portable drill bit sharpener
US10712511B2 (en) 2017-05-18 2020-07-14 Senko Advanced Components, Inc. Optical connector with one-piece body

Also Published As

Publication number Publication date
FI40141C (fi) 1968-10-10
GB1007544A (en) 1965-10-13
FI40141B (de) 1968-06-28
CH406887A (de) 1966-01-31
DK109666C (da) 1968-05-27

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