Spiral Channel Patents (Class 408/230)
  • Patent number: 11229959
    Abstract: A drill includes a body. The body includes a first cutting edge, and a second cutting edge apart from the first cutting edge to the back end side relative to the first cutting edge and formed in a recess traversing an outer peripheral portion of the body. In a side view of the body in a first direction in which a distance between a center axis of the body and a first outer end of the first cutting edge is seen the longest, a second outer end of the second cutting edge is located at the center axis side relative to the first outer end of the first cutting edge.
    Type: Grant
    Filed: August 7, 2018
    Date of Patent: January 25, 2022
    Assignee: Sumitomo Electric Hardmetal Corp.
    Inventors: Shuhei Misumi, Minoru Yoshida, Yoshiji Sato
  • Patent number: 11191551
    Abstract: A surgical bur includes a body and a drill point. The body includes flutes and lands. Each of the flutes includes a cutting edge, a rake face, and a clearance surface. Each of the lands is convex-shaped and disposed between a pair of the flutes. The drill point includes axial relief surfaces. Each of the axial relief surfaces has a planar area, is distinct from the lands and borders (i) a distal portion of one of the cutting edges, (ii) one of the lands, and (iii) one of the clearance surfaces.
    Type: Grant
    Filed: February 1, 2018
    Date of Patent: December 7, 2021
    Assignee: Medtronic PS Medical, Inc.
    Inventors: John W. Kulas, Donald E. Stearns
  • Patent number: 11173554
    Abstract: A cutting tool comprises at least one cutting edge and at least one relief surface adjacent thereto. The relief surface is arranged to provide clearance behind the cutting edge between the cutting tool and a workpiece and comprises one or more grooves arranged to communicate, in use, a cutting media across the relief surface.
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: November 16, 2021
    Assignee: GKN Aerospace Sweden AB
    Inventors: Tore Hagward, Anders Wretland
  • Patent number: 11141799
    Abstract: The drill has a rake face, a flank face, and an outer circumferential surface. The flank face is continuous to the rake face. The outer circumferential surface is continuous to both the rake face and the flank face. A ridgeline between the rake face and the flank face constitutes a cutting edge. A ridgeline between the rake face and the outer circumferential surface constitutes an outer circumferential end. A groove is provided cyclically in the rake face to extend at an angle relative to an axis of the drill, the angle being larger than a helix angle of the drill. The groove has a depth of more than or equal to 1.5 ?m.
    Type: Grant
    Filed: May 11, 2018
    Date of Patent: October 12, 2021
    Assignee: Sumitomo Electric Hardmetal Corp.
    Inventor: Shinya Nakata
  • Patent number: 10952746
    Abstract: A method for producing a cutting tool, in particular a drill bit, is specified wherein the cutting tool has a front end (F) at the front and a rear end (R) toward the rear, wherein a tool tip is formed on the front end (F), a point thinning is ground at the tool tip with a grinding tool, the point thinning being ground to be narrower toward the front than toward the rear. The point thinning is ground with a constant point thinning angle (AW). Furthermore, a corresponding cutting tool is specified.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: March 23, 2021
    Assignee: KENNAMETAL INC.
    Inventors: Tim Guter, Jürgen Schwägerl
  • Patent number: 10882121
    Abstract: A drill according to a non-limiting aspect may have a body, a cutting edge, a rake face, and a groove. The cutting edge may have a curved chisel edge, a pair of first cutting edges, and a pair of second cutting edges. The second cutting edge may have a first portion extending from the chisel edge and a second portion extending from the first portion toward the first cutting edge. The rake face may have a first region extending from the first portion and a second region extending from the second portion. A first rake angle of the first region may be zero or a negative value. A second rake angle of the second region may be a negative value. An absolute value of the second rake angle may be greater than an absolute value of the first rake angle.
    Type: Grant
    Filed: December 25, 2017
    Date of Patent: January 5, 2021
    Assignee: KYOCERA Corporation
    Inventor: Hironori Nishikoori
  • Patent number: 10850333
    Abstract: A drill including: a chip discharge groove formed in an outer periphery of an edge portion serving as a leading end side portion of a drill body; and a cutting edge formed in an intersecting edge between a rake surface of a leading end side region and a leading end flank of the edge portion. The drill having a margin portion, a shoulder portion and a web thinning portion. The cutting edge includes, in order from a rotation center, first cutting edge, second cutting edge, shoulder cutting edge, and margin cutting edge portions. Honing widths of the second cutting edge, the margin cutting edge, and the shoulder cutting edge portions satisfy a relation represented by expression (1), as follows: honing width of the shoulder cutting edge portion>honing width of the margin cutting edge portion?honing width of the second cutting edge portion.
    Type: Grant
    Filed: May 23, 2019
    Date of Patent: December 1, 2020
    Assignee: TUNGALOY CORPORATION
    Inventor: Takao Katagiri
  • Patent number: 10786266
    Abstract: A surgical bur including primary flutes and auxiliary flutes. The primary flutes include (i) first clearance surfaces, and (ii) first rake surfaces with first cutting edges. The primary flutes extend from a proximal end of the surgical bur to a distal end of the surgical bur. The auxiliary flutes are localized in central regions or distal regions of the surgical bur. The auxiliary flutes include (i) second clearance surfaces, and (ii) second rake surfaces with second cutting edges. At least one of the auxiliary flutes is located between a pair of adjacent ones of the primary flutes.
    Type: Grant
    Filed: April 30, 2018
    Date of Patent: September 29, 2020
    Assignee: Medtronic Xomed, Inc.
    Inventors: John W. Kulas, Donald E. Stearns
  • Patent number: 10710175
    Abstract: An orbital drill includes a drilling portion, a shank portion, and a neck portion between the drilling portion and the shank portion. The drilling portion includes one or more right-handed spiral flutes with cutting edges having a positive axial rake angle for positive cutting action while orbiting into a material. The right-handed spiral flutes have a positive radial and axial rake angle. The drilling portion also includes one or more left-handed spiral flutes located rearward of the one or more right-handed spiral flutes with cutting edges having a positive axial and radial rake angle for positive cutting action while orbiting back out of the material and removing any material left in the hole, thereby eliminating a separate reaming operation. A method of machining a workpiece using the orbital drill is also disclosed.
    Type: Grant
    Filed: November 15, 2018
    Date of Patent: July 14, 2020
    Assignee: KENNAMETAL INC.
    Inventors: Danny R. Davis, Stephen G. Pritchard
  • Patent number: 10632542
    Abstract: A cutting tool according to an aspect of the present disclosure includes a cutting edge portion which contains at least one of cubic boron nitride and polycrystalline diamond. The cutting edge portion includes a flank face, a negative land contiguous to the flank face, and a cutting edge formed by a ridgeline between the flank face and the negative land. At least one of the negative land and the flank face is provided with a plurality of recesses and a projection. The projection is formed by arranging the edges of adjacent recesses in contact with each other.
    Type: Grant
    Filed: August 25, 2017
    Date of Patent: April 28, 2020
    Assignee: Sumitomo Electric Hardmetal Corp.
    Inventors: Gaku Harada, Yoshinori Tanigawa, Satoru Kukino
  • Patent number: 10596641
    Abstract: A drill structure includes a shank part and a flute part arranged on one end of the shank part. A chisel edge is formed on the front end of the flute part and two drill blades with tilt directions toward the shank part are symmetrically formed on the two sides of the chisel edge. Every drill blade includes: a primary relief surface with a cutting edge, a first connecting edge and a first chamfering edge, a secondary relief surface with a knife-back edge, a second connecting edge, a second chamfering edge and an outer edge, and an assist relief surface. The second connecting edge joins to the first connecting edge, and the second chamfering edge connects with the first chamfering edge. The assist relief surface, which tilts toward the shank part the, is extend from the first chamfering edge and the second chamfering edge. This drill structure can improve the surface finish of the drilling hole.
    Type: Grant
    Filed: January 20, 2017
    Date of Patent: March 24, 2020
    Assignee: TCT GLOBAL LIMITED
    Inventors: Sung-Hao Chien, Li-Yi Chao, Feng-Yu Lin, Ming-Yuan Zhao, Chun-Yu Chen
  • Patent number: 10576552
    Abstract: The rotary tool has two coupling parts, namely a carrier and a cutting head having a front end face. The carrier has a pin seat into which a coupling pin of the cutting head is inserted. Effective stop faces are formed on the pin seat and on the coupling pin in the axial direction for axial pull-out protection. For a design that is as simple as possible, in particular in terms of grinding, a side face adjoins a respective stop face of the coupling pin and, when viewed in the axial direction, freely extends to the end face. In particular, the side face forms a torque face. For reliable clamping attachment, in particular with larger nominal diameters (D), a separating slot is made in the carrier and a clamping screw is inserted into it, both of which serve to fix the cutting head in the pin seat.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: March 3, 2020
    Assignee: KENNAMETAL INC.
    Inventors: Horst Manfred Jäger, Michael Schuffenhauer, Jüergen Schwäegerl, Berthold Heinrich Zeug
  • Patent number: 10518336
    Abstract: A drill according to an embodiment includes a bar-shaped drill body extending along a rotation axis, a cutting edge located at a front end of the drill body, and a first flute extending spirally from the cutting edge toward a rear end of the drill body. The first flute includes a first region which is located close to the front end and has a helix angle ?1, and a second region which is located closer to the rear end than the first region and has a helix angle ?2 smaller than the helix angle ?1. The second region includes an elongated protruding part along the first flute.
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: December 31, 2019
    Assignee: KYOCERA CORPORATION
    Inventors: Kenichirou Koga, Hirokazu Hatano
  • Patent number: 10507533
    Abstract: The drill comprises a base body, which extends in the axial direction along an axis of rotation and rotates about the axis of rotation in a direction of rotation during operation. Into the base body are incorporated flutes and between consecutive flutes is formed a rear surface, which extends, in relation to the direction of rotation, from a leading flute to a trailing flute. On the rear surface in the region of the leading flute, a guide chamfer and a support chamfer spaced apart from it in the direction opposite the direction of rotation are formed, wherein the support chamfer, as radially outermost region, forms a support edge for a merely linear support.
    Type: Grant
    Filed: May 11, 2017
    Date of Patent: December 17, 2019
    Assignee: KENNAMETAL INC.
    Inventor: Tim Guter
  • Patent number: 10357832
    Abstract: A drill is provided with a body having a rod shape configured to rotate about a rotational axis, a cutting edge that is located at a tip portion of the body and extends from an outer periphery of the body toward the rotational axis when viewed from the tip portion, a flank located at the tip portion and disposed along the cutting edge, a covering layer that covers at least the tip portion of the body, and one or more recessed portions disposed on the flank at positions close to the cutting edge.
    Type: Grant
    Filed: October 21, 2015
    Date of Patent: July 23, 2019
    Assignee: KYOCERA CORPORATION
    Inventor: Hiroshi Ogawa
  • Patent number: 10335866
    Abstract: A method is specified for producing a rotary tool (2) having a base body (4), which extends in a longitudinal direction (L) and in which at least one flute (6) is ground in by grinding in a first partial flute (12A) with a first helix angle (W1) in a first grinding step and by subsequently grinding in a second partial flute (12B) with a second helix angle (W2) in a second grinding step, the second helix angle differing from the first helix angle (W1) so that a flute (6) that expands in the longitudinal direction (L) is formed, wherein the two partial flutes (12A, 12B) are ground in using the same grinding wheel (11). In this way, a particularly quick production is realized. Furthermore, a corresponding rotary tool (2) is specified.
    Type: Grant
    Filed: January 13, 2017
    Date of Patent: July 2, 2019
    Assignee: KENNAMETAL INC.
    Inventor: Julia Tempelmeier
  • Patent number: 10335166
    Abstract: A surgical bur including flutes and lands. Each of the flutes includes a cutting edge, rake surfaces and a clearance surface. The rake surfaces of one of the flutes are decoupled from each other. Each of the lands is disposed between a pair of the flutes.
    Type: Grant
    Filed: March 20, 2015
    Date of Patent: July 2, 2019
    Assignee: MEDTRONICS PS MEDICAL, INC.
    Inventors: John W. Kulas, Donald E. Stearns
  • Patent number: 10335167
    Abstract: A drill bit including a shaft which has a pyramidal shaped end defining a drill tip with a plurality of edges defining the pyramidal shape. One or more recesses are provided for directing away debris produced while drilling, the at least one recess having a first portion extending along the shaft and a second portion having a first portion extending along the shaft and a second portion which extends along the drill tip; wherein the. The second portion which extends along the drill tip. The second portion of the at least one recess extends along an edge of the drill tip.
    Type: Grant
    Filed: August 10, 2015
    Date of Patent: July 2, 2019
    Assignee: SURGIBIT IP HOLDINGS PTY LIMITED
    Inventor: Liam Patrick Ellis
  • Patent number: 10279398
    Abstract: A drill of the present invention includes: a drill main body; a plurality of convex-arc cutting edges which are formed on a tip side of the drill main body from an outer periphery of the drill main body to a chisel edge provided near to a rotational axis; second faces which are each formed in an approximately band shape and are each formed along each of the convex-arc cutting edges on a back side of the convex-arc cutting edge in the rotational direction; third faces which are each formed to be continuous with a back side of each of the second faces in the rotational direction; and fourth faces which are each formed to be continuous with a back side of each of the third faces in the rotational direction.
    Type: Grant
    Filed: March 17, 2016
    Date of Patent: May 7, 2019
    Assignee: Mitsubishi Hitachi Tool Engineering, Ltd.
    Inventors: Shigeyoshi Fujiwara, Teruaki Niwa
  • Patent number: 10259050
    Abstract: A drill includes a bar-shaped drill body, a major cutting edge which is located at a front end of the drill body and has a straight-line region in a front view, a rake surface located along the major cutting edge, and a chip discharge flute being extended spirally around a rotation axis of the drill body in a direction from the rake surface toward a rear end of the drill body. The rake surface has a flat region located along the straight-line region.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: April 16, 2019
    Assignee: KYOCERA CORPORATION
    Inventor: Hiroshi Ogawa
  • Patent number: 10207336
    Abstract: A rotary tool comprising two coupling parts, namely a carrier and a cutting head in a front end surface. The carrier comprises a pin receptacle into which a coupling pin of the cutting head is inserted. In order to prevent pulling-out in an axial direction, stop surfaces are provided on the pin receptacle and on the coupling pin, said stop surfaces being effective in an axial direction. For a design that is as simple as possible, in particular with regard to grinding, each stop surface of the coupling pin is adjoined by a lateral surface which freely tapers off in the direction toward the end surface as viewed in the axial direction. In particular, the lateral surface constitutes a torque surface.
    Type: Grant
    Filed: October 21, 2016
    Date of Patent: February 19, 2019
    Assignee: KENNAMETAL INC.
    Inventors: Jürgen Schwägerl, Berthold Heinrich Zeug, Horst Manfred Jäger
  • Patent number: 10183342
    Abstract: The invention concerns a cutting tip (6) comprising: a core (10) that extends axially; and at least a first branch (12) and a second branch (14) that extend radially from the core (10), each comprising: a proximal portion (12a, 14a) connected to the core (10), a distal portion (12b, 14b), and a central portion (12c, 14c) connecting the proximal portion (12a, 14a) and the distal portion (12b, 14b); and a cutting edge (12d, 14d) extending at least along the distal portion (12b, 14b) and the central portion (12c, 14c); in which: the distal portion (12b) of the first branch (12) is arranged radially forward relative to the central portion (12c) of the first branch (12); and the central portion (14c) of the second branch (14) is arranged radially forward relative to the distal portion (14b) of the second branch (14).
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: January 22, 2019
    Assignee: DIAGER
    Inventor: Olivier Bonhomme
  • Patent number: 10144104
    Abstract: In order, in a drill tip (2) which is provided particularly for a modular drilling tool, to generate a ridge (18) with supporting chamfers (26, 28) in a simple way, a non-round grinding method is provided, in which, proceeding from a starting rotary position (30) which corresponds to a cutting corner position, the radius is first reduced and is subsequently increased again to form the supporting chamfer (28). There is therefore no need for a separate grinding step to form the supporting chamfers (26, 28). The supporting chamfers (26, 28) preferably extend parallel to the longitudinal mid-axis (22) in the axial direction (24) and intersect coiled chucking grooves (26).
    Type: Grant
    Filed: February 14, 2014
    Date of Patent: December 4, 2018
    Assignee: KENNAMETAL INC.
    Inventor: Horst Manfred Jaeger
  • Patent number: 10137506
    Abstract: A hand drilling tool of one or more elements coupled therebetween comprising: a chuck (2) tightened in the spindle of a tool machine allowing the tool rotation; an elongated point body (3) with tool diameter (2) having at least four helical grooves developing longitudinally on the point body and defining at least two primary cutters, and at least two secondary cutters; said two primary cutters forming a tip angle; said secondary cutters having a discharge surface S; said discharge surface S is shaped so as to create an interruption between the secondary cutters and the primary cutters by contributing to reduce the operator's effort, to reduce the temperature and to promote the discharge of the worked material. Said point body (3) is formed by a substantially cylindrical first portion and a substantially conical second portion with taper towards the end of the tool.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: November 27, 2018
    Inventor: Natalino Capone
  • Patent number: 9955981
    Abstract: A surgical bur including primary flutes and auxiliary flutes. The primary flutes include (i) first clearance surfaces, and (ii) first rake surfaces with first cutting edges. The primary flutes extend from a proximal end of the surgical bur to a distal end of the surgical bur. The auxiliary flutes are localized in central regions or distal regions of the surgical bur. The auxiliary flutes include (i) second clearance surfaces, and (ii) second rake surfaces with second cutting edges. At least one of the auxiliary flutes is located between a pair of adjacent ones of the primary flutes.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: May 1, 2018
    Assignee: Medtronic Xomed, Inc
    Inventors: John W. Kulas, Donald E. Stearns
  • Patent number: 9924952
    Abstract: A surgical dissection tool for cutting bone and other tissue includes a cutting head having an outer surface having non-paired or an odd number of flutes formed therein. Each flute includes a rake surface intersecting with the outer surface to form a cutting edge, and a relief surface opposite the rake surface. The relief surface and the rake surface form a first angle. Each flute also includes a leading angled surface extending from the relief surface to a distal end portion of the cutting head, the leading angled surface and the rake surface forming a second angle substantially the same as the first angle.
    Type: Grant
    Filed: January 11, 2016
    Date of Patent: March 27, 2018
    Assignee: Medtronic PS Medical, Inc.
    Inventors: John W. Kulas, Donald E. Stearns
  • Patent number: 9901990
    Abstract: A drilling tool includes at least two chip flutes and a chisel edge with a thinned region. The thinned region merges continuously into the chip flutes in such a way that the thinned region forms the end of the respective chip flute in the region of the chisel edge.
    Type: Grant
    Filed: February 4, 2011
    Date of Patent: February 27, 2018
    Assignee: KENNAMETAL INC.
    Inventor: Jurgen Schwagerl
  • Patent number: 9839984
    Abstract: A method of making a cutting tap includes: providing an elongate tap body having an axial forward end, an axial rearward end and a central longitudinal axis; securing the axial rearward end of the tap body in a grinding machine; and forming in the axial forward end of the tap body a correction grind and a main flute in one continuous grinding operation. A cutting tap made by the invention is also provided.
    Type: Grant
    Filed: August 14, 2014
    Date of Patent: December 12, 2017
    Assignee: KENNAMETAL INC.
    Inventor: Steven R. Burns
  • Patent number: 9731354
    Abstract: A cutting insert includes a body having an upper face, a lower face, a plurality of planar flank faces joining the upper and lower faces, and a plurality of curved flank faces joining the plurality of flank faces. A T-land is formed at a downward sloping angle with respect to the upper face. A cutting edge is formed at an intersection of a respective flank face and the T-land. A curved cutting edge is formed at an intersection of a respective curved flank face and the T-land. A micro-channel is formed in one of the flank faces, the curved flank faces and the T-land and proximate one of the cutting edge and the curved cutting edge.
    Type: Grant
    Filed: May 7, 2014
    Date of Patent: August 15, 2017
    Assignee: KENNAMETAL INC.
    Inventors: Naveen Kondameedi, Raouf Ben Amor
  • Patent number: 9724174
    Abstract: An endodontic instrument (20) for drilling root a canal within a tooth. The instrument has a working area (21) that is arranged so as to form, shape and/or cut the inner wall of the root canal. The instrument has a plurality of flutes wound around a central axis in the form of a spiral, within a conical envelope (25) so as to have a cross-section that becomes narrower from a first end (23) to the second end (26) of the instrument. The working area (21) is sub-divided into adjacent segments (13) such that the flutes alternately have a straight section and a section that is twisted in the form of a spiral and are arranged, in such a way, that the edges of the flutes are located either on the conical envelope (25) or inside the envelope on the straight sections or on the twisted sections.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: August 8, 2017
    Assignee: FKG Dentaire S.A.
    Inventor: Olivier Breguet
  • Patent number: 9662803
    Abstract: The invention relates to a rock drill comprising an insertion portion, a flute adjoined to the insertion portion, and a head portion adjoined to the flute, wherein the flute is of at least double-spiral configuration and correspondingly has at least two substantially spiral discharge grooves, to which respectively two substantially spiral flute webs forming the lateral groove walls are assigned. It is proposed that a constant spiral pitch is assigned to the first discharge groove, inclusive of the lateral groove walls thereof, along the drill longitudinal axis, and that at least one of the two flute webs assigned to the first discharge groove has or have along the drill longitudinal axis, at least in sections, a web spine width which changes, in particular, alternately.
    Type: Grant
    Filed: April 10, 2012
    Date of Patent: May 30, 2017
    Assignee: HELLER TOOLS GMBH
    Inventor: Rainer Lampe
  • Patent number: 9656328
    Abstract: Disclosed is a cutting tool, including: a cutting edge including a coating from a rake face to a flank face, and has a relief angle of not less than 15 degrees, a material of the coating having a higher wear resistance than a base material of the cutting edge, and during cutting of a work, an edge of the coating on the rake face at a top of the cutting edge is worn by friction with the work; with a progress of a wear inward in a radial direction, an edge of the coating on the flank face at the top of the cutting edge is removed by friction with the work to expose the base material thereunder; and the exposed base material is worn by friction with the work to retract the flank face inward in the radial direction.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: May 23, 2017
    Assignees: FUJI JUKOGYO KABUSHIKI KAISHA, MAKOTOLOY CO., LTD.
    Inventors: Manabu Saito, Tatsuo Nakahata, Hideharu Takahashi, Junji Tsuchiya, Masao Watanabe, Eiji Hashimoto, Hirofumi Higashiwaki
  • Patent number: 9656327
    Abstract: A drill head for deep-hole drilling includes cutting blade tips brazed to cutting chip discharge ports opened on a head distal end surface, guide pads mounted on a plurality of positions of the circumferential surface at the head distal end side, and a hollow inside portion made into a cutting chip discharge passage communicating with the cutting chip discharge ports. A guide pad portion having an arc surface that slide-contacts with the inner circumference of a cutting hole is formed on the outer end surface of the circumferential portion cutting blade tip.
    Type: Grant
    Filed: May 16, 2011
    Date of Patent: May 23, 2017
    Assignee: botek Präzisionsbohrtechnik GmbH
    Inventor: Takuji Nomura
  • Patent number: 9636756
    Abstract: A multi-lip drilling tool is described, in which main cutting edge transitions in the region of the drill into a center lip section, wherein a cooling duct that leads to the drill tip is formed in each drill web. The invention minimizes tensile stress spikes in the chip flute base, while at the same time ensuring that a hitherto unachievable coolant/lubricant quantity gets to the engaged main blade. This is ensured by selecting a duct cross sectional form similar to an unsymmetrical kidney, in which it is ensured the selected radii of curvature for the individual boundary curve sections causes as much coolant/lubricant as possible to arrive at the blade or in proximity thereto in the fastest way via the point thinning and its edges intersecting with drill core.
    Type: Grant
    Filed: September 8, 2015
    Date of Patent: May 2, 2017
    Assignee: Guehring KG
    Inventor: Christine Riester
  • Patent number: 9597735
    Abstract: A twist drill for drilling composite materials includes a shank; a drill body; a drill tip having a cutting edge, a chisel edge, and a secondary chisel edge, wherein the secondary chisel angle of the drill tip is 145° to 165 and the point angle is 70° to 100°; and a flute extending from the drill tip to the drill body. The flute has a constant helix, and the helix angle of the flute being selected from the range 45° to 55°. A method of drilling a composite material comprising fibers uses the twist drill of the present embodiment. Suitably, the composite material is carbon fiber reinforced plastic or glass fiber reinforced plastic, and optionally being a laminate material such that the method comprises stack drilling. Embodiments achieve a combination of good hole quality, good tool life and good hole size spread.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: March 21, 2017
    Assignee: SANDVIK INTELLECTUAL PROPERTY AB
    Inventor: Wan Tsin Goh
  • Patent number: 9545676
    Abstract: A general-purpose multiple-cutting edge drill includes: a drill point (1); a drill body (2); margins (3) located on an outer wall of the drill body (2); two lips, wherein, if viewed from an axial direction, from out to inside, each of the two lips successively includes an outer cutting edge (11), an arc cutting edge (12) and an inner cutting edge (13); a chisel edge (14); outer peaks (15) formed by intersection of the outer cutting edges (11) and the arc cutting edges (12); a center peak (16) formed by intersection of two inner flank surfaces and two split surfaces. Moreover, an included angle between the inner cutting edges (13) ranges from 108° to 128°, an included angle between the outer cutting edge (11) ranges from 130° to 140°, and an included angle between the inner cutting edge (13) and outer cutting edge (11) ranges from 28° to 40°.
    Type: Grant
    Filed: February 16, 2012
    Date of Patent: January 17, 2017
    Assignees: NINGBO HUAREN TOOLS CO., LTD., TEST RITE INTERNATIONAL COMPANY LIMITED
    Inventor: Jianing Sun
  • Patent number: 9539653
    Abstract: A twist drill has a shaft and a flute portion, which extends between a drill tip and the shaft and has at least two flutes, which run helically around it at an angle of twist, are separated from one another by two webs and have a land extending between the flutes on the circumference of the flute portion. In order to provide a twist drill that has the features mentioned at the beginning, has better lubrication of the round bevels, less wear, improved guidance and improved concentricity, at least two round bevels that are spaced apart from one another are provided on each land and extend on the land at an angle of inclination in relation to the drill axis that is greater than the angle of twist but less than 90°.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: January 10, 2017
    Assignee: Walter AG
    Inventors: Siegfried Rogalla, Stefan Thoma
  • Patent number: 9522428
    Abstract: A small-diameter drill having a diameter of ?3 mm or less and an end that has undergone cross thinning is provided such that in a front view, a flute portion cutting edge is curved in concave with a degree of concavity with respect to an imaginary straight line in a range of 0.5 to 2% of a drill diameter, the imaginary straight line connecting the radially outer end of the flute portion cutting edge and the radially outer end of thinning portion cutting edge, the ratio of length of the thinning portion cutting edge to length of the flute portion cutting edge is set to 0.6 to 0.9:1, and in an axially perpendicular cross-sectional view, curvature radius of a heel-side flute surface of the flute is set to be smaller than curvature radius of a flute surface along the flute portion cutting edge.
    Type: Grant
    Filed: October 24, 2013
    Date of Patent: December 20, 2016
    Assignee: Sumitomo Electric Hardmetal Corp.
    Inventor: Masaaki Jindai
  • Patent number: 9511424
    Abstract: A drill including: a chip discharge flute; and a cutting edge, the cutting edge being made up of a concavely-curved cutting edge portion formed on an inner circumferential side and a convexly-curved cutting edge portion formed on an outer circumferential side, the drill further including a cross section orthogonal to an axial center having a first convex curve corresponding to the convexly-curved cutting edge portion and a first concave curve corresponding to the concavely-curved cutting edge portion intersecting with each other, a flank following the cutting edge on the tip surface having an orthogonal clearance angle ? formed within an angular range of 9 to 20 degrees, and a ridgeline of the cutting edge having a chamfer formed with a width CW within a range of 0.002D to 0.02D (where D is a drill diameter).
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: December 6, 2016
    Assignee: OSG CORPORATION
    Inventor: Kazuteru Takai
  • Patent number: 9492877
    Abstract: A drill includes: a chip discharge flute opened in a tip surface; and a cutting edge formed at an intersecting portion between an inner wall surface of the chip discharge flute on a side of a drill rotation direction and a tip flank formed on the tip surface, the cutting edge being made up of a concavely-curved cutting edge portion formed on an inner circumferential side and a convexly-curved cutting edge portion formed on an outer circumferential side, a cross section orthogonal to an axial center having a first convex curve corresponding to the convexly-curved cutting edge portion and a first concave curve corresponding to the concavely-curved cutting edge portion intersecting with each other.
    Type: Grant
    Filed: September 6, 2011
    Date of Patent: November 15, 2016
    Assignee: OSG CORPORATION
    Inventors: Kazuteru Takai, Kazutoyo Itoh, Hiroyuki Amano
  • Patent number: 9352399
    Abstract: A drill comprises a drill body that is rotatable on an axis. Chip evacuating flutes, which are open on front flanks of the drill body and are extended rearwards, are formed in a periphery of the drill body on its front side. Cutting edges are formed along ridge lines where the front flanks intersect with wall surfaces of the chip evacuating flutes facing a drill rotating direction. At least first and second front flanks are formed on the front flanks in order of their locations in the drill rotating direction from its leading side to its trailing side. A clearance angle of the second front flank is greater than that of the first front flank. Intersection lines of the first and second front flanks cross the cutting edges.
    Type: Grant
    Filed: April 11, 2012
    Date of Patent: May 31, 2016
    Assignee: MITSUBISHI MATERIALS CORPORATION
    Inventors: Kazuya Yanagida, Koichiro Naruke
  • Patent number: 9339875
    Abstract: The invention relates to a deep-hole drill, comprising a first coating extending over the effective length of the guide section and a second coating that is applied to the tip of the drill in the cutting region, the region of which extends over an axial length that, at a maximum, corresponds to double the nominal diameter of the drill. In such a way, when the bore tip is worn by use, said tip can be recoated after sharpening without the nominal diameter of the drill tip substantially increasing, in particular even after being sharpened several times.
    Type: Grant
    Filed: November 19, 2010
    Date of Patent: May 17, 2016
    Assignee: OERLIKON SURFACE SOLUTIONS AG, PFÄFFIKON
    Inventors: Jens Eggemann, Detlev Bross, Gerhard Peyerl, Klaus Springer
  • Patent number: 9333565
    Abstract: The present invention relates to a rotary cutting tool consisting of a shank and at least one cutting section comprising a plurality of cutting teeth, the cutting section being conceptionaly and functionally divided into several sub-sections along the tool axis (“zones” for brevity), wherein each zone has its own core form and its own cutting edges, its own teeth land form and its own zone cutting length, these being selected according to the perceived task for which each zone of the tool is to be optimized.
    Type: Grant
    Filed: February 15, 2012
    Date of Patent: May 10, 2016
    Assignee: SOMTA TOOLS (PTY) LTD.
    Inventor: Vladimir Volokh
  • Patent number: 9248511
    Abstract: A drilling tool extends in a longitudinal direction and has a drill point and first and second major cutting edges, which extend approximately radially outward. The drill point is arranged eccentrically relative to a central axis, which is the same as the axis of rotation. The second major cutting edge is arranged by a cutting-height difference higher than the first major cutting edge. The first major cutting edge has a shorter radial edge length than the second major cutting edge. A method of utilizing the tool is also disclosed.
    Type: Grant
    Filed: April 19, 2008
    Date of Patent: February 2, 2016
    Assignee: KENNAMETAL INC.
    Inventor: Bernhard Walter Borschert
  • Patent number: 9232952
    Abstract: A surgical dissection tool for cutting bone and other tissue includes a cutting head having an outer surface having non-paired or an odd number of flutes formed therein. Each flute includes a rake surface intersecting with the outer surface to form a cutting edge, and a relief surface opposite the rake surface. The relief surface and the rake surface form a first angle. Each flute also includes a leading angled surface extending from the relief surface to a distal end portion of the cutting head, the leading angled surface and the rake surface forming a second angle substantially the same as the first angle.
    Type: Grant
    Filed: April 16, 2012
    Date of Patent: January 12, 2016
    Assignee: Medtronic PS Medical, Inc.
    Inventors: John W. Kulas, Donald E. Stearns
  • Patent number: 9216460
    Abstract: A coolant-hole equipped drill includes a drill main body, a cutting edge portion which has a tip flank, a chip discharging groove provided with a front groove wall surface and a rear groove wall surface, a cutting edge formed at a ridge line portion where the front groove wall surface and the tip flank intersect with each other, a land portion formed between the chip discharging grooves adjacent to each other in the rotating direction, and a coolant hole drilled at the land portion and opened at the tip flank. The coolant hole includes a front hole wall surface, a rear hole wall surface, and an outer-circumference hole wall surface.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: December 22, 2015
    Assignee: MITSUBISHI MATERIALS CORPORATION
    Inventors: Nobuyuki Matsuda, Hiroyuki Higashi, Koichiro Naruke, Tadashi Yamamoto, Kazuya Yanagida
  • Patent number: 9205498
    Abstract: A rotary cutting tool has a shank and an interchangeable cutting tip which can be coupled to the shank. The shank has a locking geometry having an undercut into which a locking projection of the cutting tip projects. Numerous lateral supporting surfaces and supporting counter-surfaces are provided for laterally fixing the cutting tip in the shank.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: December 8, 2015
    Assignee: KENNAMETAL INC.
    Inventor: Horst Manfred Jaeger
  • Patent number: 9199315
    Abstract: There is now provided a twist drill and a method for producing a twist drill which method includes forming a flute of a twist drill. The drill has drill material and a tip portion with a cutting lip. The drill has a land structure and a flute to remove chip residue. The land structure has a flute wall and a cutting edge structure that is disposed longitudinally along the flute wall. The cutting edge structure has a first portion at the drill tip portion and a second portion disposed away from the drill tip portion. The flute wall extends further into the land structure at the second portion of the cutting edge structure than at the tip portion to provide a greater amount of drill material at the tip portion than at the second portion of the cutting edge structure.
    Type: Grant
    Filed: September 20, 2010
    Date of Patent: December 1, 2015
    Assignee: KENNAMETAL INC.
    Inventors: Dieter Mühlfriedel, Bernhard Borschert, Jürgen Schwägerl
  • Patent number: 9180531
    Abstract: A drill includes a cutting edge. The cutting edge has a point angle which is continuously decreased from a center-position point angle A (herein, 0°<A<180°) at a center position to a maximum-diameter-position point angle of 0° at a maximum diameter position. The cutting edge has a relief angle which is continuously decreased from the center position to the maximum diameter position. The cutting edge of the drill has a relief angle at the maximum diameter position. Hence, the cutting edge also serves as a cutting edge for reaming. The ridgeline and relief face of the cutting edge have no corner, thereby providing good wear resistance.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: November 10, 2015
    Assignee: FUJI JUKOGYO KABUSHIKI KAISHA
    Inventors: Tatsuo Nakahata, Manabu Saito, Masanori Hosoi, Hideharu Takahashi
  • Patent number: 9178341
    Abstract: The present invention concerns fishing adapters for pilling a cable or the like through a hole drilled in a wall or other structure and in one aspect comprises a drill bit connector to enable the adapter to be demountably attached to a drill bit and an item connector to enable a cable or other elongate/linear item to be attached to the adapter, wherein the adapter further has a rotary coupling between the drill bit connector and the item connector to permit the drill bit to rotate as the adapter with cable or other elongate/linear item attached is pulled through a drilled hole without significantly twisting said cable or other elongate/linear item.
    Type: Grant
    Filed: November 2, 2012
    Date of Patent: November 3, 2015
    Inventor: Malory Maltby