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Publication numberUS3751177 A
Publication typeGrant
Publication dateAug 7, 1973
Filing dateNov 20, 1970
Priority dateNov 24, 1969
Also published asDE2057512A1, DE2057512B2, DE2057512C3
Publication numberUS 3751177 A, US 3751177A, US-A-3751177, US3751177 A, US3751177A
InventorsK Faber
Original AssigneeSandvik Ab
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Guide pad mounting on a drill bit
US 3751177 A
Abstract
A drill has a guide pad pivotally mounted on it, on that the guide pad may adapt itself to the surface of a hole wherein the drill is being operated.
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Claims  available in
Description  (OCR text may contain errors)

United States Patent 11 1 Faber 14 1 Aug. 7, 1973 1 1 GUIDE PAD MOUNTING ()N A 01111111 BIT 1,866,082 7/1932 011115011 175/202 9 {75] Inventor: Kurt Heinrich Albert Erich Faber, Sundvikcn, Sweden 2 47:726 1953 Assigncc: Sandvik k g Sandvikcn BlShOp X Swede" FOREIGN PATENTS OR APPLICATIONS [22] Filed: Nov. 20, 1970 313,802 6/1929 Great Britain 175/325 271,839 3/1928 Great Britain.... 175/325 [211 APPl- 91,296 1,221,024 5/1960 France 175 325 66,525 9/1914 Austria..... 175/325 Foreign Application Priority Data 321,935 6/1920 Germany 175/325 N .24,1969 S 'd 16082 69 m w Ln Primary Examiner-Marv1n A. Champlon 52 us. c1 408/200 175/325 175/408 Lewis Attorney-Pierce, Scheffler & Parker [51] Int. Cl B23b.5l/00 [58] Field of Search 175/320, 325, 344-347, [57] ABSTRACT A dr111 has a gu1de pad p1vota11y mounted on it, on that [56] References Cited the guide pad may adapt itself to the surface of a hole UNITED STATES PATENTS 'wherein the drill is being operated. 2,151.646 3/1939 Subkow ct a1. 175/325 7 Claims, 8 Drawing Figures PAIENIEmuc 1 ms sum 1 or 4 7 PAIENIED AUG 71973 SHEET 3 BF 4 l I I I.

GUIDE PAD MOUNTING ON A DRILL BIT between the outer surface of the pad and the wall of the hole. Now it has been observed that the shape of the drill may change, for instance by elastic deformation or by diameter wear, in such a way that there is established only a partial contact between the pads and the wall of the hole. This results in an increased specific surface pressure from the pads causing undue friction.

The invention provides an improvement in this regard by means of a guide pad which is mounted on a pivot, so that it can rock and adapt itself to the surface of the hole, thereby securing a full surface contact.

The invention is closer described in the following specification with appended drawings, showing:

FIG. 1, a side view of a drill according to the invention.

FIG. 2, an end view of the same drill.

FIG. 3, a guide pad on the same drill.

FIG. 4, a cross section on the line 4-4 in FIG. 3.

FIG. 5, a side view of another embodiment of the invention.

FIG. 6, an end view of the drill in FIG. 5.

FIG. 7, a side view of a third embodiment of the invention.

FIG. 8, an end view of the drill in FIG. 7.

The drill shown in FIGS. 1 and 2 is a metal drill having a number of cutting inserts 11 clamped in supports 13 by clamps 12 of which all except one have been omitted in FIG. 2. The supports 13 are attached to the drill in a suitable way, e.g., by screws or by brazmg.

For supporting and guiding the drill in the hole are provided two guide pads 20, suitably of sintered carbide. The pads are mounted on a pivot so that they can rock around both a longitudinal and a transverse axis. The pivoting around a longitudinal axisis obtained by means of a support 21 witha cylindrical sliding surface 22, which rests on a matching surface 23 in a depression in the drill. The periphery surface 25 of the support 21 is approximately flush with the periphery surface of the drill. The support is fastened with a screw 26 (FIG. 1) and a resilient washer 27 permitting rocking of the support.

The pivot axis 24 lies outside the pad in order that when the drill rotates the friction on the pad will urge the leading edge 28 of the pad away from the edge of the hole. This lessens the friction and facilitates the entering of the lubricant between the pad and the wall. By a suitable position of the centre 24 the surface pressure can be properly distributed with regard to the hydrodynamic effect of the lubricant.

The pivoting on a transverse axis is obtained by a support 30 having a cylindrical surface 31 sliding along a matching surface 32 in the support 21. The pad is held by a tubular pin 34 within a bore through both supports 21 and 30. As the axis of the pin lies outside the pivot centre 33, the rocking requires bending of the pin. This is made possible by an annular space 35 extending along a part of the pin 34.

The pivot mounting around two perpendicular axii provided by the above described two cylindrical sliding joints may be obtained by a single spherical joint.

FIGS. 5 and 6 show a modified embodiment of the invention in which the pad unit 40 is symmetrical. It carries two sintered carbide pads 41 on each side of a fastening screw 42, under the head of which there is a helical spring 43 permitting the rocking around a longitudinal axis. This embodiment comprises no rocking on a transverse axis. The advantage of the symmetrical pad is that the pad can be turned half a turn when it has been worn out on the side having the greatest pressure.

FIGS. 7 and 8 show another symmetrical pad unit 50 having four pad inserts 51 on a drill for counterboring (reaming), i.e. for enlarging the internal diameter of holes. The specific advantage is that the great area of the pads makes the'tool suitable for reaming the inner diameter of tubes with a thin wall that would be damaged by the pressure from smaller guide pads.

'I claim:

1. Drill for drilling in metal having a guide pad adapted to slide with frictional contact along the wall of the drill hole, in which the guide pad is pivotally rockable on at least one axis having the same general direction as the sliding surface of the guide pad and situated at a fixed distance from the drill axis.

2. Drill as defined in claim 1, in which the guide pad is mounted on a sliding bearing with a curved sliding bearing surface.

3. Drill as defined in claim I in which the pivot comprises a cylindrical sliding bearing with a longitudinal axis.

4. Drill as defined in claim 3, in which the pivot comprises a second cylindrical sliding bearing with a transverse axis.

5. Drill as defined in claim 1 in which the pivot comprises a spherical sliding bearing.

6. Drill as defined in claim 1 having a guide pad on a longitudinal pivot axis, in which said axis lies outside the periphery surface of the pad.

7. Drill as defined in claim 1, in which the pivoted guide pad is rockable about longitudinal and transverse axes whereby said guide pad adapts itself to the surface of a hole in which said drill is beingoperated.

I I l l

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US874848 *Mar 15, 1907Dec 24, 1907J P Karns Tunneling Machine CoSink-shaft drill.
US875664 *Apr 30, 1906Dec 31, 1907J P Karns Tunneling Machine CoTunneling-machine.
US1745351 *Oct 1, 1928Feb 4, 1930George G OsbornDrill-bit agitator
US1866082 *Aug 10, 1927Jul 5, 1932Carlson Anthony EExpansion drill bit
US2151646 *Jun 28, 1938Mar 21, 1939Union Oil CoSubsurface speed-up drilling mechanism
US2647726 *Jun 30, 1950Aug 4, 1953Hallen Company IncHorizontal earth boring machine
AT66525B * Title not available
DE321935C *May 31, 1916Jun 15, 1920Berthold Monasch Dr IngBohrverfahren fuer horizontale Erdbohrungen
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GB271839A * Title not available
GB313802A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4108567 *Aug 22, 1977Aug 22, 1978Sandvik AktiebolagBoring tool
US4130371 *Jul 11, 1977Dec 19, 1978Sandvik AktiebolagCutting insert and rotary cutter tool
US4133399 *Dec 17, 1976Jan 9, 1979Wilhelm Hegenscheidt GmbhBoring device
US4218162 *Nov 1, 1978Aug 19, 1980Elizabeth Jean HillierDrilling bit
US4573381 *Feb 24, 1984Mar 4, 1986Top Tech, Inc.Boring device
US4596498 *Jul 12, 1983Jun 24, 1986MAPAL Fabrik fur Prazisions werkzeuge Dr. Kress KGSingle bit reamer with improved guide members
US5042596 *Jul 12, 1990Aug 27, 1991Amoco CorporationImbalance compensated drill bit
US5131478 *Jul 10, 1990Jul 21, 1992Brett J FordLow friction subterranean drill bit and related methods
US5328304 *Jan 21, 1993Jul 12, 1994Mapal Fabrik Fur Prazisionswerkzeuge Dr. Kress KgReamer
US5402856 *Dec 21, 1993Apr 4, 1995Amoco CorporationAnti-whirl underreamer
US5697737 *Sep 11, 1995Dec 16, 1997Sandvik AbSupport pad for drill
US5758997 *Aug 7, 1996Jun 2, 1998Mealey; MichaelSelf-centering indexable drill
US5921727 *Jan 20, 1998Jul 13, 1999Cogsdill Tool Products, Inc.Reamer with friction resistant layer and method for forming same
US6602028 *Jun 14, 2000Aug 5, 2003Sandvik AktiebolagSupport pad for a deep hole drill
US7296953Jan 3, 2007Nov 20, 2007Joerg GuehringDeep hole drill
US7320565 *May 20, 2004Jan 22, 2008Sandvik Intellectual Property AbEdge-carrying drill, method for the manufacture of the drill, and drilling tool comprising such a drill
US7326009 *May 20, 2004Feb 5, 2008Sandvik Intellectual Property AbEdge-carrying drill body having an internal chip-removal channel
US8511946 *Aug 25, 2011Aug 20, 2013Rotary Technologies CorporationStabilization of boring tools
US8696269 *Dec 17, 2009Apr 15, 2014Sandvik Intellectual Property AbDrill body as well as support pad therefor
US8770896 *Nov 29, 2011Jul 8, 2014Tungaloy CorporationReamer
US8801343 *Oct 19, 2011Aug 12, 2014Kennametal Inc.Rotating cutting tool and guide insert therefor
US9114460Feb 3, 2013Aug 25, 2015Tungaloy CorporationGuide pad, cutting tool body and cutting tool
US20040265080 *May 20, 2004Dec 30, 2004Sandvik AbEdge-carrying drill, method for the manufacture of the drill, and drilling tool comprising such a drill
US20050025594 *May 20, 2004Feb 3, 2005Sandvik AbEdge-carrying drill body having an internal chip-removal channel
US20050244237 *Jun 16, 2005Nov 3, 2005Joerg GuehringDeep hole drill
US20070110529 *Jan 3, 2007May 17, 2007Joerg GuehringDeep hole drill
US20090297285 *Mar 5, 2007Dec 3, 2009Unitac, Inc.Deep hole drilling machine
US20100158623 *Dec 17, 2009Jun 24, 2010Sandvik Intellectual Property AbDrill body as well as support pad therefor
US20120051862 *Aug 25, 2011Mar 1, 2012Woodruff Douglas JStabilization of boring tools
US20120070243 *Nov 29, 2011Mar 22, 2012Tungaloy CorporationReamer
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EP2398619A1 *Feb 17, 2010Dec 28, 2011Seco Tools AbGuide arrangement for a cutting tool and cutting tool including a guide arrangement
EP2398619A4 *Feb 17, 2010Jul 4, 2012Seco Tools AbGuide arrangement for a cutting tool and cutting tool including a guide arrangement
WO2010096005A1 *Feb 17, 2010Aug 26, 2010Seco Tools AbGuide arrangement for a cutting tool and cutting tool including a guide arrangement
WO2013182810A1 *Jun 5, 2013Dec 12, 2013SnecmaCalibration head for the drilling of shafts
Classifications
U.S. Classification408/200, 175/408, 408/224, 175/325.4, 408/226, 408/705
International ClassificationB23B51/06, B23D77/00, B23B51/04
Cooperative ClassificationB23D77/00, B23B2251/02, B23B2251/422, Y10S408/705, B23B2251/56, B23B51/048
European ClassificationB23D77/00, B23B51/04C
Legal Events
DateCodeEventDescription
Jan 28, 1983AS02Assignment of assignor's interest
Owner name: SANDVIK STEEL OF COLORADO, INC., A CORP. OF CO
Owner name: SANTRADE LTD., ALPENQUAI 12, CH-6002 LUCERNE, SWIT
Effective date: 19830125
Jan 28, 1983ASAssignment
Owner name: SANTRADE LTD., ALPENQUAI 12, CH-6002 LUCERNE, SWIT
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SANDVIK STEEL OF COLORADO, INC., A CORP. OF CO;REEL/FRAME:004091/0836
Effective date: 19830125