US3393477A - Apparatus for grinding drills - Google Patents

Apparatus for grinding drills Download PDF

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Publication number
US3393477A
US3393477A US463593A US46359365A US3393477A US 3393477 A US3393477 A US 3393477A US 463593 A US463593 A US 463593A US 46359365 A US46359365 A US 46359365A US 3393477 A US3393477 A US 3393477A
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United States
Prior art keywords
rotor
drill
grinding
housing
disk
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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 - Lifetime
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US463593A
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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 shaft of the grinder is swingable laterally with respect to the axis of the drill from grinding position to nonengag-ing position.
  • Idler coupling means are provided between the drill and the carriage so that the grinder may be swung into grinding position, according to the number of cutting edges present on the drill during relative rotation of the drill and rotor.
  • the grinder is also mounted so as to be slightly tilted so that grinding means on the carriage and grinder enable the grinder to grind with proper clearance or lip relief angle. In this manner successive cutting edges of the drill are ground with only one grinder. No adverse effects from centrifugal force are noted.
  • FIG. 1 shows a vertical longitudinal section through the grinding apparatus according to the invention, showing the grinding disk during the grinding operation
  • FIG. 2 shows a similar section but with the grinding disk swung away and out of contact with the drill
  • FIG. 3 shows a vertical section through the portion of the grinding disk rotor at which portion the carrying housing of the grinding disk and the devices for its swinging are situated
  • FIG. 4 is a side elevation of the portion shown in FIG. 3,
  • FIG. 5 shows the same portion seen from the left according to FIG. 4,
  • FIG. 6 shows the same portion from the right according to FIG. 4,
  • FIG. 7 is a plan view of the same portion
  • FIG. 8 shows on a reduced scale a plan view of the grinding apparatus
  • FIG. 9 shows from below (in the direction of the arrow IXIX in FIG. 1) a cam disk included in the apparatus,
  • FIG. 10 shows from below (in the direction of the arrow XX in FIG. 1) the devices for swinging the carrying housing of the grinding disk shaft and for supporting the cutting end of the drill during the rotating of the drill for the grinding of the subsequent edge,
  • FIGS. 11 and 12 are similar views as FIG. 10 'but showing these devices in different positions
  • FIG. 13 shows on the same scale as in FIGS. 1 and 2 a plan view of the central portion of the grinding apparatus
  • FIG. 14 shows a vertical section through this portion with the idle coupling of the apparatus
  • FIGS. 15 and 16 are partly out side elevations seen from the right in FIG. 14 of the idling coupling in a driving position and in idling position,
  • FIG. 17 shows in a reduced scale a plan view of the rotor of the apparatus with the idling coupling
  • FIG. 18 is an end elevation of the operative end of the twist drill.
  • the twist drill 1 shown on the drawings is assumed to be clamped in the chuck of a post drill machine (not shown).
  • the cutting end of the twisted drill 1 is provided with two cutting edges 2, 3 (FIG. 18) and two helically extending chip channels 4.
  • a rotor In the interior of the housing 6, having the shape of a box, there is mounted for rotation about the vertical central axis a rotor, generally designated at its lower part by the legend 7, and is, in a manner later described, driven by the drill 1.
  • This rotor 7 is 'bearingly mounted on the one hand by an axial support trunnion 8 on one end of the rotor 7, said trunnion engaging in a guiding sleeve 9 on the bottom 10 of the housing 6, and on the other hand by means of a hub 11 carrying the upper, sleeve-shaped, portion 12 of the rotor.
  • a sleeve 13 In this upper portion 12 there is journalled a sleeve 13 provided with a clamping chuck or a guiding and clamping sleeve 14 fitting the drill 1 in question.
  • a coupling 15 to be de scribed in detail in the following.
  • the grinding disk 16, arranged in the interior of the rotor 7 is fast on the inner end of a horizontal shaft 17 journalled in a carrying housing 18.
  • This housing 18 is tiltably (FIG. 4) mounted on two carrying trunnions 19, situated below the shaft 17 and extending perpendicularly to the vertical plane of this shaft, on a frame-like stand 20 which is journalled in the rotor 7 to turn about an axis parallel to the axis of rotation of the rotor and thus also the axis of rotation of the twist drill 1.
  • the grinding disk shaft 17 is driven via conical gears 21, 22 and an intermediate shaft 23 carrying on its lower end a gear wheel 24 which cooperates with a stationary ratcheted disk 25 near the bottom 10 of the housing 6. Between a bracket 26 (FIGS.
  • the lower edge 31 of this guiding rule is sloped somewhat in such a way that during the swinging of the carrying housing in lateral direction the housing is forced to follow a curved or an inclining movement path with the periphery of the grinding disk 16 in abutment against the cutting end 32 of the drill 1.
  • a crank arm 33 having an outer end stud projecting upwardly into a downwardly opening circular groove 35 in a cam disk 36.
  • the cam groove 35 is eccentrical in relation to the rotation axis of the rotor 7.
  • the cam disk 36 is connected, as by a pin, to a gear wheel 37 and both are journalled on the sleeve-shaped upper portion 12 of the rotor 7.
  • the gear wheels 37 and 38 have the same division diameter but are provided with a difierent number of teeth.
  • the gear wheel 37 has about 160 teeth and the gear wheel 38 about teeth.
  • the gear wheels 37, 38 cooperate with a common smaller gear wheel 39 which is journalled on a stationary tap 40 on the lower side of the upper portion 41 of the housing 6.
  • the cam disk 36 Upon rotation of the rotor 7 the cam disk 36, due to the different numbers of teeth of the gear wheels 37 and 38, will be turned slowly in relation to the rotor and, due to the fact that the cam groove 35 is arranged eccentrically, the stand 20 will by means of the crank 33, 34 turn and thereby cause a swinging of the grinding disk 16 from its central position in the rotor 7 below the cutting end 32 of the drill 1 away from this end and back to its initial position. During this swinging movement the rotor 7 will have undergone a considerable number of revolutions, and the grinding disk 16 with its shaft will have rotated much faster still. Of course the speed of rotation of the grinding disk depends on the gearing ratio such as 24, 25 and 21, 22.
  • a drill channel engagement arm 44 is journalled on a short vertical shaft 43 fast on the upper end of the frame-like stand 20 (FIGS. -12).
  • the arm 44 has a swingable end 45 shaped to engage in a channel of the drill and thus hold the drill in correct position.
  • the arm 44 and end 45 are swung in one direction by means of a hook shaped dog 46 and in the other direction by an abutment 47', both on an actuating arm 47 secured on the short shaft 43. There is a certain amount of lost angular motion between the arms 44 and 47 as shown in FIGS.
  • a radial pivot stud 48 carrying a latch lever 49 having camming and abutment arms 52 and 53, respectively.
  • the lever 49 is biased to a clockwise position as shown in FIG. 15 by a spring 50.
  • the abutment arm 53 can engage against end wall abutments 54 of a pair of diametrically opposite recesses 58 in a lower flange portion 55 on the sleeve 13, with the latch arm 52 riding with a rounded surface 51 engaging the under face '56 of the central portion 56 of the cam 34.
  • one of the wall abutments 54 drives the latch and with it the sleeve 12, to rotate the rotor 7 as a whole.
  • the lower face 56 of the central portion 56 of the cam member 36 is provided with a downwardly extending hump 57 to engage on and depress the latch arm 51 as shown in FIG. 16 and so permit rotation of the inner sleeve 13 relative to the rotor sleeve 12.
  • the inner sleeve 13 with the drill becomes free to rotate relative to the rotor with the end of the arm 47 receiving thrust of the drill during half a revolution of the drill.
  • the latch is turned by the spring 50 so as to engage the corresponding abutment in the diametrically opposite recess 58.
  • the sleeve 13 is then automatically again coupled to the rotor 7 which then is driven by means of the drill 1. For each complete revolution of the cam disk 36 in relation to the rotor 7 there is thus caused a freeing and a turning of the drill half a revolution in relation to the rotor 7.
  • a ring of flanges or the like 59 which in common serve as a fan for blowing the chips formed out through the apertures 5 in the housing 6.
  • the coupling In case the grinding apparatus is to be used for grinding drills having more than two cutting edges, the coupling must be shaped in accordance thereto. Generally, the coupling must be shaped in such a way that the sleeve 13 with the drill 1, each time the cam 57 (or any of the cams) passes the lever 52, is freed from the rotor and allowed to rotate a part of a revolution corresponding to the number of cutting edges of the drill.
  • a grinding apparatus for a twist drill comprising a housing for being held substantially stationary and having upper and lower walls, an axially vertical rotor within the housing and having an upper coaxial sleeve portion mounted for rotation on the upper wall and rotatably receiving a coaxial chuck means for, in turn, receiving the fluted end portion of a drill to be sharpened; latchlike coupling means for normally coupling the chuck means to the rotor; a grinder disc within the housing for engaging the end of the drill and mounted on a generally horizontal grinder spindle normally about radial to the rotor axis; a bearing member for carrying the spindle and mounted on the rotor for tilting and for swinging about an axis transverse to the spindle and parallel with that of the rotor; gear means for converting rotation of the rotor relative to the housing to higher speed rotation of the grinder spindle; a cam member concentric with and about the sleeve portion and geared with the chuck means to turn at a lower speed than the latter, and

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US463593A 1965-03-04 1965-06-14 Apparatus for grinding drills Expired - Lifetime US3393477A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE279265 1965-03-04

Publications (1)

Publication Number Publication Date
US3393477A true US3393477A (en) 1968-07-23

Family

ID=20260713

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Application Number Title Priority Date Filing Date
US463593A Expired - Lifetime US3393477A (en) 1965-03-04 1965-06-14 Apparatus for grinding drills

Country Status (7)

Country Link
US (1) US3393477A (xx)
AT (1) AT253963B (xx)
BE (1) BE666481A (xx)
CH (1) CH462653A (xx)
DE (1) DE1502349A1 (xx)
GB (1) GB1103427A (xx)
NL (1) NL6508257A (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US4850150A (en) * 1988-11-16 1989-07-25 Bishop Steven C Hand held drill with integral drill bit sharpener
US20080318498A1 (en) * 2005-12-22 2008-12-25 Aktiebolaget Skf Vibration Device for a Super Finishing Apparatus and an Attachment Tool Comprising the Vibration Device
CN115193659A (zh) * 2022-08-20 2022-10-18 温州金榜洁具有限公司 一种水龙头加工工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3031427C2 (de) * 1980-08-18 1987-01-22 Karl-Heinz Westport Conn. Giebmanns Hinterschleifvorrichtung für Bohrer

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 (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US4850150A (en) * 1988-11-16 1989-07-25 Bishop Steven C Hand held drill with integral drill bit sharpener
US20080318498A1 (en) * 2005-12-22 2008-12-25 Aktiebolaget Skf Vibration Device for a Super Finishing Apparatus and an Attachment Tool Comprising the Vibration Device
US8100741B2 (en) * 2005-12-22 2012-01-24 Aktiebolaget Skf Vibration device for a super finishing apparatus and an attachment tool comprising the vibration device
CN115193659A (zh) * 2022-08-20 2022-10-18 温州金榜洁具有限公司 一种水龙头加工工艺

Also Published As

Publication number Publication date
AT253963B (de) 1967-05-10
GB1103427A (en) 1968-02-14
DE1502349A1 (de) 1969-07-03
NL6508257A (xx) 1966-09-05
CH462653A (de) 1968-09-15
BE666481A (xx) 1965-11-03

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