Arcuate Cutting Edge Patents (Class 407/62)
  • Patent number: 10272504
    Abstract: Rotatable, solid cutting tool with both right-hand spirals and left-hand spirals, each of which includes an interrupted cutting edge having individual cutting edges. Individual cutting edges of the right hand spirals are axially staggered helically around a circumference of a cutting portion with respect to individual cutting edges of the left hand spirals so that, at each axial position along an axial length of the cutting portion, each radial cross-section includes both at least one individual cutting edge on a right hand spiral and at least one individual cutting edge on a left hand spiral. Individual cutting edges have a length along an outer circumference of the cutting tool that is the same for individual cutting edges of the right hand spiral and individual cutting edges of the left hand spirals. Cutting edges on differently handed spirals are both right handed cutting edges or both left handed cutting edges.
    Type: Grant
    Filed: February 2, 2016
    Date of Patent: April 30, 2019
    Inventors: Jason Ray Dodds, Sidney Toomes, Cody David Cluff
  • Patent number: 9884376
    Abstract: A milling burr for use in handheld machines has a shank and a cutting member of hard metal which is rigidly connected to said shank. The cutting member is provided with cutting teeth which extend in a first direction of twist. The cutting teeth are divided in cutting tooth portions by rows of tooth dividers extending in a second direction of twist. The cutting tooth portions and the tooth dividers are arranged one behind the other when seen in the peripheral direction in such a way that an overlap occurs in an in each case alternating manner when seen in the peripheral direction.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: February 6, 2018
    Inventors: Nicolas Huth, Hans-Jürgen Zimmer, Thomas Plömacher
  • Patent number: 9415450
    Abstract: A tool head includes an ovoid basic element disposed about a center axis, at least two chip grooves formed in the basic element, and a number of major cutting edges. Each major cutting edge is disposed in a convex course along a respective chip groove of the at least two chip grooves. The major cutting edges define with their radially outermost region a nominal diameter. A radial distance from each major cutting edge to the center axis in a front, tip-side, arc portion increases up to the nominal diameter and in a rear, shank-side, arc portion decreases back down to a minimum diameter.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: August 16, 2016
    Assignee: KENNAMETAL INC.
    Inventors: Markus Hirt, Tamir Patric Sherif
  • Patent number: 8979439
    Abstract: Electrode milling cutter for machining spot welding electrodes, said electrode milling cutter having one or more milling edges, wherein at least one of the milling edges is interrupted by one or more cut-outs at one or more points. The invention also relates to a milling device and to an apparatus for subsequently machining spot welding electrodes.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: March 17, 2015
    Assignee: Lutz Precision, k.s.
    Inventor: Stefan Fahnenstich
  • Patent number: 8939683
    Abstract: A rotary cutting tool for forming a heat plate has a plurality of cutting blades arranged about a cutting tool body. The cutting edge profile of the rotary cutting tool has a lower radius portion and a middle convex portion. The lower radius portion has its center on the axis of the rotary cutting tool and the middle convex portion is defined by an inverse square curve of form Y=1/X2 with the vertical axis of the origin of the inverse square curve offset from the axis of the rotary cutting tool. X has values between 0.25 units and 4 units.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: January 27, 2015
    Inventor: Robert Alvin White
  • Patent number: 8870498
    Abstract: A ball end mill in which a ball end cutting edge (3) has a convex shape in a tool rotation direction with respect to a line connecting a rotation center (O) and a radially outer end (3o) of the ball end cutting edge (3), in a front view of the tool. In the ball end mill, a rake angle (?) of each portion of the ball end cutting edge (3) is set in a range from ?10° to 0°, and the negative value of the rake angle (?) is increased from a tip of the ball end cutting edge (3) and a radially outer end (3o) of the ball end cutting edge (3) toward a middle point in the radial direction, and is maximized at approximately the middle point in the radial direction.
    Type: Grant
    Filed: October 21, 2009
    Date of Patent: October 28, 2014
    Assignee: Sumitomo Electric Hardmetal Corp.
    Inventors: Kazuo Maeda, Kouji Tominaga
  • Patent number: 8858130
    Abstract: An indexable, invertable cutting insert has radially-oriented positioning segments on a front face of the insert and radially-oriented positioning segments on the back face of the insert. The radially-oriented positioning segments are shifted on the front face relative to those on the back face such that, when the cutting insert is engaged within the toolholder, the cutting segment utilized on the front face will never be directly opposite the cutting segment utilized on the back face. A toolholder system is made up of the cutting insert and a toolholder capable of securing and indexing the cutting insert.
    Type: Grant
    Filed: April 24, 2012
    Date of Patent: October 14, 2014
    Assignee: Kennametal Inc.
    Inventors: Lewis Ray Morrison, Howard Murphy, Gianfranco Accardi, Marco Procopio, Andreas Lieber, Juan Seculi, Kumar Reddy Mylavaram Nikhilesh
  • Patent number: 8807883
    Abstract: A knife (1) for machining spot welding electrodes (2) includes one or more cutting edges (3) for machining the spot welding electrodes (2) and one or more diverting devices (7) for diverting removed spot welding electrode material that occurs during the cutting process away from the area of the knife (1). The knife (1) has a cutting edge (3) and an associated diversion device (7). The cutting edge (3) and the associated diversion device (7) are formed in one piece. The knife (1) can be a component of an electrode cutting tool. A cap cutter that includes the knife (1) and/or the electrode cutting tool is also disclosed.
    Type: Grant
    Filed: January 29, 2009
    Date of Patent: August 19, 2014
    Assignee: Lutz Precision, K.S.
    Inventor: Peter Lutz
  • Patent number: 8657539
    Abstract: A round cutting insert with a reverse anti-rotation feature that can be manufactured easily and inexpensively is disclosed. The round cutting insert includes a plurality of dimples formed on a first surface and another plurality of dimples formed on a second, opposing surface. The round insert is reversible and indexable. The round cutting insert is removable received in an insert receiving pocket in a tool body. The insert receiving pocket includes a single projection that is capable of being received in one of the plurality of dimples. The cooperation between the projection and one of the plurality of dimples prevents rotation of the round cutting insert when mounted in the insert receiving pocket. The plurality of dimples and the projection can be any desirable complimentary shape, such as a slot, a V-shape, a wagon wheel, a sports wheel, a pyramid, and the like.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: February 25, 2014
    Assignee: Kennametal Inc.
    Inventors: Lewis Ray Morrison, Kumar Reddy Mylavaram Nikhilesh, Suresh Mali
  • Patent number: 8585329
    Abstract: This aims to provide a ball end mill capable of preventing the occurrence of a ‘pluck’ off a work face. The ball end mill (10) is equipped with two cutting edges (11 and 12) formed at its spherical tips. The rake face (11a) of the cutting edge (11) has its inner circumference end arranged at a position offset farther forward of a rotating direction than a spindle. The rake face (11a) of the cutting edge (11) has its inner circumference end arranged at a position protruding by a predetermined distance from the spindle to the opposite side of the cutting edge forming side in the radial direction. The portion of the cutting edge (11) from a connecting portion (11f), which is formed midway of a ridgeline (11c) or a boundary line between the rake face (11a) of the cutting edge (11) and a flank (11b), to the outer circumference end of the cutting edge (11) is a main cutting edge (11m).
    Type: Grant
    Filed: November 4, 2008
    Date of Patent: November 19, 2013
    Assignees: Toyota Jidosha Kabushiki Kaisha, Hitachi Tool Engineering, Ltd.
    Inventors: Haruhisa Higasayama, Yoshimitsu Nagashima
  • Patent number: 8573897
    Abstract: A cutting tool includes a tool body and at least one double-sided cutting insert mounted in an insert pocket of the tool body. The at least one double-sided cutting insert includes: an elliptical top surface; an elliptical bottom surface; first and second side surfaces connecting between both side ends of the top and bottom surfaces, respectively; a pair of corners connecting between both side ends of the first and second side surfaces, respectively; first and second cutting edges formed at a boundary portion between the top surface and the first side surface and a boundary portion between the bottom side surface and the second side surface and having a curved shape, respectively.
    Type: Grant
    Filed: November 27, 2008
    Date of Patent: November 5, 2013
    Assignee: TaeguTec, Ltd.
    Inventor: Hee Seok Kim
  • Patent number: 8556547
    Abstract: An end mill body wiih a corner cutting edge forming a convex arc shape of which the rotation locus becomes convex toward the tip outer peripheral side is formed at a side ridge portion of the corner cutting edge rake face, a gash is formed on the inner peripheral side of the corner cutting edge rake face, and an end cutting edge connected to the corner cutting edge and extending toward the inner peripheral side is formed at a tip-side side ridge portion of the end cutting edge rake face. An intersection line between the corner cutting edge rake face and the end cutting edge rake face is located closer to the radial inner peripheral side with respect to the axis than the center of the convex arc that the corner cutting edge forms in the rotation locus.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: October 15, 2013
    Assignee: Mitsubishi Materials Corporation
    Inventors: Yuji Takagi, Seiichiro Kitaura
  • Patent number: 8267625
    Abstract: The present invention is directed to an insert, a slotting cutter assembly and a method for machining a plurality of slots in a metallic alloy part. The insert may comprise a cutting edge, at least one primary radius, at least two secondary radii and a clearance angle. The cutting edge may form a narrow outer end at a tip of the insert and a larger width region at a distance inward from the narrow outer end. The clearance angle may extend rearward from the cutting edge. The slotting cutter assembly may comprise a plurality of inserts and a cutter body. The cutter body may comprise a plurality of retaining slots and a plurality of support portions. The retaining slot may be configured to receive the insert. The support portion may provide support for the insert.
    Type: Grant
    Filed: February 22, 2008
    Date of Patent: September 18, 2012
    Assignee: Greenleaf Technology Corporation
    Inventor: Donald R. Hughes
  • Publication number: 20120170985
    Abstract: A method of manufacturing a multi-tooth fir-tree or bulbous form milling cutter, by the grinding of a blank with a grinding wheel, wherein, a flat clearance angle ? of between 0° and 20° is generated on each tooth (13) by the path (14) of the grinding wheel (10), with each tooth (13) having a width (X) from tip to point of maximum clearance (see FIG. 5), calculated as follows: X={[(Rtan?)cos?]cos?}±0.25% (being calculation (A)) where R=radius of cutter, and where ?=clearance angle measured from a tangent to the tooth tip, and furthermore, wherein, each tooth (13) has a variable depth (Y) around the cutter, calculated as follows: Y={[?D]/[180/?]} 0.5±0.2. (being calculation (B)) where D=maximum diameter of the form at any given point along the form. The invention also includes fir tree and bulbous milling cutters produced by the above defined method.
    Type: Application
    Filed: September 21, 2010
    Publication date: July 5, 2012
    Inventors: Christopher Peter Ralph Hill, Mark Kirby
  • Publication number: 20120039677
    Abstract: A contour end mill includes a shank portion and a cutting portion. The cutting portion defines a cutting diameter, a corner radius and a major radius. The major radius is greater than one-half of the cutting diameter. As a result, the end mill produces a much smoother finish and a reduced chip thickness.
    Type: Application
    Filed: August 11, 2010
    Publication date: February 16, 2012
    Applicant: Kennametal Inc.
    Inventor: Danny Ray Davis
  • Patent number: 8061396
    Abstract: A tooth for a circular saw or a mower drum that can be used to cut standing trees or brush and undergrowth. The tooth has four cutting edges arranged in a first pair of opposed cutting edges that are generally straight and a second pair of opposed cutting edges that are generally concave. The tooth is mounted in a holder in a first or second cutting position that orients a cutting edge of the first or second pair to physically contact and effect a cutting method to a cuttable material. In a first cutting method, a generally straight cutting edge contacts the material, resulting in a slicing action. In a second cutting method, a generally concave cutting edge contacts the material, resulting in a gouging action. Teeth in the circular saw or brush mower alternate between first and second cutting positions, allowing both cutting methods to be applied to cuttable material.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: November 22, 2011
    Inventors: Charles MacLennan, Denis Rioux
  • Patent number: 8021085
    Abstract: A conical shaped engraving tool has a tip configuration for increased strength that is especially desirable when engraving stainless steel. The improved conical tip consists of a thin V or U shaped slot or channel that touches the central axis of the tool and provides the cutting edge while leaving the maximum amount of material on the tip of the tool for maximum tool strength. A back angle is rotated 90 degrees to the cutting edge so that cutting forces are directed along the cutting edge instead of just on a point for further increasing the tip strength to prevent it from breaking. Also the thin slot is tilted on a slight angle away from a central axis thereby creating a downward force on the cutting edge of the tool when the tool is rotated, which results in pushing burrs into the cut creating an engraved line with better appearance.
    Type: Grant
    Filed: February 23, 2007
    Date of Patent: September 20, 2011
    Inventor: Lance Nelson
  • Patent number: 7810532
    Abstract: A method for constructing tambour slats using a system of router bits. The router bit system can include at least two router bits, one of which may have a semi-spherical nose cutting surface and a concave ‘S’ shaped ogee cutting surface; and the other of which may have a ‘S’ shaped ogee cutting surface and a concave quarter round cutting surface. The method for constructing a tambour slat can include milling a groove in a strip of material. The strip of material with a groove may then be milled to form a tongue and a neck portion that may slide into a groove milled in another strip of material. The milling operations may be performed by a router fitted with the router bits from the router bit system. By using the router bit system, each strip of material may yield up to two tambour slats.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: October 12, 2010
    Assignee: Amana Tool Corporation
    Inventor: Lonnie Bird
  • Publication number: 20090252564
    Abstract: A face milling cutter. The abstract of the disclosure is submitted herewith as required by 37 C.F.R. §1.72(b). As stated in C.F.R. §1.72(b): A brief abstract of the technical disclosure in the specification must commence on a separate sheet, preferably following the claims, under the heading “Abstract of the Disclosure.” The purpose of the abstract is to enable the Patent and Trademark Office and the public generally to determine quickly from a cursory inspection the nature and gist of the technical disclosure. The abstract shall not be used for interpreting the scope of the claims. Therefore, any statements made relating to the abstract are not intended to limit the claims in any manner and should not be interpreted as limiting the claims in any manner.
    Type: Application
    Filed: October 3, 2008
    Publication date: October 8, 2009
    Inventors: Vladimir VOLOKH, Sergel BOULAKHOV, Shay ZEIDNER, Leonid Sharivker
  • Publication number: 20090238649
    Abstract: The invention relates to an indexable insert for solid drills comprising four identical cutting edges (30) arranged at a distance above a supporting base (42) and each extending between two cutting-edge corners (28?, 28?). The cutting edges are each bounded by a cutting face (46) and a clearance face (48), with the inclusion of a wedge angle (b). Of the cutting edges (30), one in each case is in an active operating position during the drilling operation. To permit optimum adaptation to the cutting conditions and drilling characteristics, varying over the length of the cutting edge of the drilling tool, it is proposed according to the invention that the height (h) of the four cutting edges (30), measured from the plane of the supporting base (42), and/or the clearance angle (a) varies over the length of the respective cutting edges (30).
    Type: Application
    Filed: September 19, 2006
    Publication date: September 24, 2009
    Inventors: Jacek Kruszynski, Uwe Kretzschmann, Hendrik Nitzsche, Henry Schuett
  • Patent number: 7343946
    Abstract: A high speed planer head. Disclosed according to one aspect of the invention is a hub and a threaded member. The hub is axially disposed for rotation about an axis, and has a pocket for receiving a first knife against a supporting wall of the pocket. The threaded member has a frustoconical ramping portion for producing a wedging force against the knife when the threaded member is threaded into a threaded hole in the hub. According to another aspect of the invention, a second hub for carrying a second knife is provided, the second hub preferably being bolted to the first hub to that the hubs can be disassembled. The second knife preferably has two linear cutting edges and the second knife preferably has at least two curvilinear cutting edges and more preferably has four concave, semi-circular cutting edges that are spaced apart from one another with 90 degree rotational symmetry.
    Type: Grant
    Filed: March 16, 2004
    Date of Patent: March 18, 2008
    Assignee: Key Knife, Inc.
    Inventor: Bradley R. Stager
  • Patent number: 7326214
    Abstract: Apparatus and a method of inserting spinal implants is disclosed in which an intervertebral space is first distracted, a hollow sleeve having teeth at one end is then driven into the vertebrae adjacent that disc space. A drill is then passed through the hollow sleeve removing disc and bone in preparation for receiving the spinal implant which is then inserted through the sleeve.
    Type: Grant
    Filed: August 9, 2003
    Date of Patent: February 5, 2008
    Assignee: Warsaw Orthopedic, Inc.
    Inventor: Gary Karlin Michelson
  • Patent number: 7284935
    Abstract: A rotary cutting tool comprises a body having opposite ends and a plurality of diametrally opposed pairs of flutes forming cutting edges extending helically from one end of the body toward the opposite end. All of the cutting edges are circumferentially spaced uniformly from one another at the one end of the body. Each cutting edge of one pair of edges is formed on the same and uniform helix, whereas each cutting edge of another pair of edges is formed on a uniform helix which varies from the cutting end of the body toward the opposite end. The steepness of the helices is such that no flute communicates with any other flute and, at a zone between the ends of the flutes, the cutting edges formed by such flutes again are uniformly circumferentially spaced from one another.
    Type: Grant
    Filed: February 27, 2006
    Date of Patent: October 23, 2007
    Assignee: Ultra-Tool International Incorporated
    Inventor: David J. Povich
  • Patent number: 7168512
    Abstract: A cutting insert 1, 1?, comprising opposite insert planes E1, E2 of a base 2 of one base area 3 wherein a conical surface section 4a of a lateral face 4 and the base area 3 facing the same form an acute angle alpha while forming a cutting edge 5, while a planar surface section 4b of the same lateral face 4 forms an obtuse angle beta with the opposite base area 3. The cone axis 6 of the conical surface area 4a lying in the insert plane E1, E2 runs off-set in parallel to the center insert axis 7 lying in the same insert plane E1, E2 while forming an off-center arcuate profile of the cutting edge 5. A milling cutter 17 comprising a number of such cutting inserts 1, 1? is characterized in that a cutting insert 1, 1? preferably disposed on the periphery of the center line M of a tool support 16 is off-set from the center line M by an angle phi equal to 5±3 degrees.
    Type: Grant
    Filed: March 5, 2004
    Date of Patent: January 30, 2007
    Assignee: Kennametal Inc.
    Inventors: Michael Schuffenhauer, Steffen Kranz, Werner Boguth
  • Patent number: 7134811
    Abstract: An end mill type rotary cutting tool and associated cutting inserts that collectively compensate for radial pocket runout, thereby eliminating overlap marks in a machined work piece. The tool has pockets arrayed in helical flutes such that after one insert has abraded the work piece, a subsequent flute makes an overlapping pass. The inserts are so mounted in the cutting tool and have curved corners configured such that no degree of pocket runout due to manufacturing tolerances will cause any portion of the cutting edge of any insert to form an incuse cut in the work piece which penetrates the machined surface by more than the manufacturing tolerance. Thus overlap of inserts eliminate outward projections in the machined work piece and dimensions and configuration of the inserts and their pockets eliminate inward gouges, thereby eliminating visible overlap marks in the work piece.
    Type: Grant
    Filed: October 24, 2003
    Date of Patent: November 14, 2006
    Assignee: Kennametal Inc.
    Inventors: Mark A. Francis, Kenneth G. DeRoche
  • Patent number: 7094005
    Abstract: A shank milling cutter includes a cutting portion which is intended to come into engagement with the workpiece, wherein the envelope surface of the cutting portion is substantially cylindrical. At least one major cutting edge is arranged at the peripheral surface of the cutting portion and at least one minor cutting edge (face cutting edge) is arranged at the end face of the cutting portion and with an end diameter D. The minor cutting edge, in projection onto a plane containing the milling cutter axis, has a convexly curved portion with a radius of curvature R>D/2 and a center of curvature M located such that a distance from the center of curvature M to the axis is in a range from zero to a value smaller than D/2.
    Type: Grant
    Filed: December 9, 2004
    Date of Patent: August 22, 2006
    Assignee: Sandvik Intellectual Property AB
    Inventor: Jonas Svensson
  • Patent number: 6976815
    Abstract: A milling cutter includes a body having three cutting edges formed by the body. An end of the body situated opposite the cutting edges defines a fastening end of the milling cutter. Each cutting edge extends from an outer periphery of the body substantially to a center rotational axis of the body along a substantially convexly curved path. Radially outer and radially inner ends of each cutting edge are situated axially rearwardly of an axially foremost point of the cutting edge. Each cutting edge lies on a respective imaginary sphere having a radius which has a center which that is spaced from the cutting edge in a direction toward the fastening end and spaced radially from the center axis.
    Type: Grant
    Filed: February 4, 2004
    Date of Patent: December 20, 2005
    Assignee: Seco Tools AB
    Inventors: Carl-Erik Berglöw, Mattias Puide, Sven-Erik Persson, Kurt Nordlund
  • Patent number: 6953310
    Abstract: A cemented carbide ball end mill comprises a cutting portion with a semi-spherical ball portion at a tip thereof. The cutting edge portion has a cutting edge rake face and a chip evacuating flute at the ball portion. An angle formed by a straight line connecting a vertex of the ball portion, where an intersection line passes through, and another end of the intersection line with respect to the central axis, is from 30° to 50°. Further, and angle formed by the rake face and the chip evacuating flute is from 100° to 150°, and a width of the chip evacuating flute is 0.5 to 5 times as large as a radius of the ball portion.
    Type: Grant
    Filed: April 9, 2003
    Date of Patent: October 11, 2005
    Assignee: Nachi-Fujikoshi Corp.
    Inventors: Kenji Iwamoto, Yousuke Tsuritani
  • Patent number: 6709318
    Abstract: A grinding wheel and a method for grinding bar blade for the production of spiral gear teeth are described. For economical grinding of such bar blades the grinding wheel has a conical grinding surface (Pp) widening from a small diameter (d1) to a large diameter (d2), a cylindrical grinding surface (Ps) adjoining the conical grinding surface (Pp), and a toroidal grinding surface (G) adjoining the cylindrical grinding surface (Ps). The grinding wheel embodied in this manner enables profile grinding (rough grinding) and subsequent generating grinding (finish grinding) of the surfaces of the bar blade without the necessity of remounting the blade. For practical purposes the grinding wheel rotates about a stationary axis (S), and the bar blade to be ground is guided along the grinding wheel at appropriately set angles.
    Type: Grant
    Filed: September 26, 2002
    Date of Patent: March 23, 2004
    Assignee: Oerlikon Geartec AG
    Inventors: Horia Giurgiuman, Manfred Knaden
  • Publication number: 20030091400
    Abstract: A rotary cutting tool wherein the positioning of a cutting insert is accomplished via a frontal reference surface instead of a backing reference surface. This is done by modifying the regrindable insert to include a pair of lateral shoulders that must be seated on the reference surface to ensure proper positioning of the insert relative to the cutting tool. The insert is retained against centrifugal dislodgment by the frontal reference surface during rotation of the tool, thereby permitting the latter to be operated at higher rotational speeds. The use of a frontal reference surface also eliminates the need of having to reposition the cutting tool vis-à-vis the workpiece between each sharpening operation of the cutting insert.
    Type: Application
    Filed: November 15, 2001
    Publication date: May 15, 2003
    Inventors: Philippe Turcot, Gabriel Fafard
  • Patent number: 6221076
    Abstract: The invention is directed to a reamer for shaping a bone socket such as an acetabular cavity. The reamer comprises a cutting head for removing material from the socket during rotation of the cutting head. The cutting head comprises a number of relatively long main cutting edges, each of which extends in a direction from a base to a top of the reamer, and a number, higher than the number of main cutting edges, of relatively short peripheral cutting edges, which are located at the base and distributed at angulary spaced intervals about a rotational axis. The invention also provides a method for implanting a prosthesis component into a bone socket. During shaping of the bone socket, a top portion of the reamer is completely received in the bone socket to such an extent, that a cylindrical entrance portion is formed in the socket. The invention also provides a kit including a reamer and a prosthesis.
    Type: Grant
    Filed: March 3, 1998
    Date of Patent: April 24, 2001
    Assignee: Astra Aktiebolag
    Inventors: Björn Albrektsson, Lars Carlsson, Magnus Jacobsson, Tord Röstlund, Stig Wennberg
  • Patent number: 6164877
    Abstract: A formed rotary cutting tool including; a generally cylindrical body portion having (a) a plurality of flutes which are formed in the body portion to generally axially extend and which are located around the axis so as to be angularly spaced apart from each other, and (b) cutting edges which cooperate with each other to have a diameter that changes in the axial direction, so that the body portion has a desired configuration. The tool is rotated about the axis to form a groove whose configuration corresponds to the desired configuration, in a solid workpiece. Each of the cutting edges is defined by an intersection of a rake face and a flank face which has a predetermined clearance angle that is constant in the axial direction, irrespective of the change of the diameter.
    Type: Grant
    Filed: March 9, 1999
    Date of Patent: December 26, 2000
    Assignee: OSG Corporation
    Inventors: Satoru Kamata, Naomi Tatebe
  • Patent number: 6095723
    Abstract: An engraving tool includes an end portion extending to a tip, a pair of flutes in the end portion and wall sections between the flutes. The wall sections are ground in the area of the tip to form surfaces having cutting edges and facets disposed at specific angles relative to a plane perpendicular to axis.
    Type: Grant
    Filed: January 19, 1999
    Date of Patent: August 1, 2000
    Assignee: NEMCO Medical
    Inventors: Ellis Melvin Reynolds, Howard Dean Trosper
  • Patent number: 6071045
    Abstract: A cutting insert (20) having a geometrical configuration comprising first and second oppositely facing, parallel faces interconnected by a V-shaped bottom (26) and side (28) and top (30) walls perpendicular to the faces with the side walls (28) being parallel to one another. The cutting insert (20) has first (32) and second (34) flutes disposed on opposite sides of a center axis with the first flute (32) extending in an arc from the top wall (30) to one of the side walls (28) and the second flute (34) extending in an arc from the top wall (30) to the other of the side walls (28). The first flute (32) presents a flute surface extending in the arc and is disposed at an angle sloping downwardly from the first face (22) to the second face (24) along the entire arc thereof to define intersections with the top wall (30) and one of the side walls (28) respectively which are disposed at an angle other than relative to the faces.
    Type: Grant
    Filed: May 6, 1998
    Date of Patent: June 6, 2000
    Inventor: Daniel Janness
  • Patent number: 6053673
    Abstract: An improved corner-rounding milling cutter preformed indexable and insert therefor. A plurality of the inserts staggered around the axis of rotation of the cutter body cut segments of a composite arcuate cutting profile of uniform radius, together forming the complete arcuate cutting profile. The inserts are interchangeable between any of the positions provided on the milling cutter.
    Type: Grant
    Filed: March 8, 1999
    Date of Patent: April 25, 2000
    Inventors: Steven M. Swift, Larry R. Swift, Moses H. Sahagian
  • Patent number: 5924824
    Abstract: A cutting insert for mounting in a cutting tool, comprises a cutting head portion with a substantially arcuate cutting edge and a substantially trapezoidal mounting body portion integrally formed therewith. The mounting body portion has substantially planar upper and lower surfaces and substantially straight side surfaces converging in the direction away from the cutting head portion. The entire cutting edge of the cutting head portion lies on a sphere and defines an arc substantially less than, the cutting head portion having an imaginary chordal plane passing through peripheral ends of the arc. The side surfaces of the mounting body portion are directed substantially radially with respect to a center of the sphere and are substantially shorter than the length of the chordal plane.
    Type: Grant
    Filed: August 13, 1997
    Date of Patent: July 20, 1999
    Assignee: Iscar Ltd.
    Inventors: Amir Satran, Yuri Men
  • Patent number: 5915888
    Abstract: The present invention relates to a rotary cutting tool assembly comprising a combination of a single ball nose cutting insert of a generally elongated configuration. The ball nose cutting insert is fixed into a holding body provided with a slot adapted to securely and non-movably hold the insert. The single ball nose cutting insert has at least one fill ball nose cutting end having a cutting edge of a continuous spiral fluted configuration. The fill ball nose cutting end comprises a cutting face consisting of two radius cutting edges meeting at a center or tip of the full ball nose cutting end forming a web. The cutting face forms a true helical path made of a continuous curve following a spiral shape, and helix angles of the radius cutting edges are between 3 to 45 degrees with respect to a longitudinal axis of the ball nose cutting insert in both right and left directions.
    Type: Grant
    Filed: October 1, 1997
    Date of Patent: June 29, 1999
    Inventor: Alfonso Minicozzi
  • Patent number: 5873681
    Abstract: A cutter plate (20) for a milling tool (10), has a top surface (26) with fastening hole and a bottom surface (28) with a thread cutting profile. Between these two faces (24, 26) and at a side surface (28), a cutting edge (32) is formed which is adjoined in the top surface (24) by a chip guide groove (34) with chip outlet edge (36). The cutting edge (32) and the chip outlet edge (36) are disposed on helicoidal paths (38, 40) which diverge in top view. Tooth edges (42) on the side surface form angles (b) with the top surface (24). The cutter plate (20) can be installed obliquely to the tool axis, for example the shaft of the tool in order to achieve a soft first cut, which has a higher degree of quiet running, longer tool life, and a lower cutting pressure of the tool and to effect higher stability of the tool, in particular with small shaft diameters.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: February 23, 1999
    Assignee: Zettl GmbH CNC Prazisions-und
    Inventors: Franz Pfob, Horst Nespeta
  • Patent number: 5833402
    Abstract: The present invention relates to a copying cutter provided with a cylindrical or conical body having a spherical end, constituting the active portion of the cutter, said end including a plurality of flutes inclined at a determined angle .theta. relative to the longitudinal axis of the cutter and formed along circular arcs at a determined distance x from the midplane P of the cutter, an inside face and an outside face of each of the flutes constituting, after machining, respectively a cutting face and clearance faces of each tooth of the cutter.The clearance faces comprise a first clearance face and an additional clearance face presenting at least a first facet. The cutting face has a cutting angle .gamma. given by the following equation: ##EQU1## where R is the radius of the cutter. The present invention also relates to a method of manufacturing the cutter.
    Type: Grant
    Filed: May 17, 1995
    Date of Patent: November 10, 1998
    Assignee: Societe Europeenne de Propulsion
    Inventor: Philippe Roger Martin
  • Patent number: 5741095
    Abstract: A ball end mill and an insert for use in the cutting tool. The insert has a constant angle maintained along the entire clearance face.
    Type: Grant
    Filed: January 13, 1997
    Date of Patent: April 21, 1998
    Assignee: Valenite Inc.
    Inventors: Mike Charron, Foye Powell, Lee Reiterman
  • Patent number: 5632576
    Abstract: A cutting plate for a ball-head finish miller has a support body of hard metal centered on an axis and having a pair of oppositely directed and symmetrically oriented faces each formed with a respective substantially circularly segmental recess of a predetermined depth. A pair of substantially identical and substantially circularly segmental cutting inserts are each secured to a respective one of the faces in the respective recess and each have a respective cutting layer forming a cutting edge. The inserts and their edges are symmetrical with respect to the axis and are each of a thickness substantially less than the depth of the respective recess so that each forms a chip cavity on the respective face.
    Type: Grant
    Filed: October 16, 1995
    Date of Patent: May 27, 1997
    Assignee: Widia Heinlein GmbH
    Inventor: Helmut Storch
  • Patent number: 5597269
    Abstract: A cutting tool for cutting a honeycomb core having a plurality of spiral blades each of which is formed integratedly with a cylindrical body of the cutting tool and has a lead angle of 60 degrees and more with respect to an axis of the cylindrical body. Each of blades comprises a radial edge with a lip angle ranging from 1 degree to 20 degrees along the periphery of the cutting tool and a bottom edge with a lip angle ranging from 1 degree to 20 degrees at the bottom of the cutting tool. The bottom edge curved outward in the revolutional direction of the blade.
    Type: Grant
    Filed: June 9, 1994
    Date of Patent: January 28, 1997
    Assignee: Fuji Jukogyo Kabushiki Kaisha
    Inventor: Ryuichi Ogawa
  • Patent number: 5516242
    Abstract: A cutting tool particularly adapted for machining brittle plastics in which the cutting head has its cutting edges in the first and fourth quadrants of the x-y axes and contained in a common plane on opposite sides of the axis of tool rotation. The cutting edges are on two planar inserts, which can be either integral or separate elements, which meet at the common plane and each of which is relieved or cut away in the opposite quadrant from its own cutting edge to expose the cutting edges of the other. The walls defining the reliefs have 2 or more non-aligned sections forming different angles with the axis of rotation with the steepest angle beginning at the axis and preferably inwardly of the tip of the tool and, overall, exposing not less than a full quadrant of the cutting edge of the other insert while providing cavities and contours which control the movement of the chips and the flow of coolant fluids.
    Type: Grant
    Filed: March 24, 1994
    Date of Patent: May 14, 1996
    Inventor: Randall Andronica
  • Patent number: 5363891
    Abstract: In one embodiment of saw tooth assembly, the tubular saw tooth is releasably inserted with friction fit inside the hollow of a tubular mount. In an alternate embodiment, it is the tubular mount which is releasably inserted with friction fit inside the hollow of the tubular tooth. In both cases, the hollows of the mount and tooth are coextensive, whereby a common axial through-channel is defined. The tubular mount is to be anchored to the peripheral edge of a circular saw discoid plate. The wood chip generated during circular saw operation can therefore freely engage through the common through-channel, i.e. through the whole saw tooth assembly, and escape therefrom. Wood chip clogging of the saw tooth during sawing operations is therefore substantially prevented, and the aerodynamic features of the circular are accordingly enhanced.
    Type: Grant
    Filed: November 8, 1993
    Date of Patent: November 15, 1994
    Inventor: Fernand Plante
  • Patent number: 5348426
    Abstract: A ball nose cutter having a replaceable single cutter insert in which the cutting edges thereof include a pair of mutually spaced apart cutting tips, one cutting tip at a time being selected for use by being located at the centerline of rotation of the ball nose cutter. The cutter insert is of circular cross-section for rotatably seating within a circularly cross-sectioned groove in a cutter body. A bore in the cutter insert is aligned with an off-axis threaded bore in the cutter body so that a holder screw which passes therethrough threadably holds the cutter insert with respect to the cutter body. A planar face is provided adjacent each cutting edge, wherein each planar face has an orientation so that the selected cutting tip is exactly located on the centerline rotation of the ball nose cutter.
    Type: Grant
    Filed: January 8, 1993
    Date of Patent: September 20, 1994
    Inventor: Ernest E. Krupp
  • Patent number: 5236288
    Abstract: Round indexable cutting inserts are locked in fixed angular positions in the pockets of a milling cutter by conically tipped screws which seat in recesses formed in the back faces of the inserts. By turning the screws, their tips may be retracted to inactive positions to enable conventional polygonal inserts to be used in the pockets.
    Type: Grant
    Filed: December 4, 1992
    Date of Patent: August 17, 1993
    Assignee: National Carbide Outlet, Inc.
    Inventor: Rudolph H. Flueckiger
  • Patent number: 5075942
    Abstract: A tire rasp blade has a planar body portion and a working edge portion. The working edge comprises a combination of adjacent, or closely aligned teeth and spaced teeth. The trailing edges of any one adjacent tooth is displaced from the plane of the body portion to one side of the blade and the leading edge of the next following adjacent tooth is displaced to the opposite side of the blade.
    Type: Grant
    Filed: March 10, 1988
    Date of Patent: December 31, 1991
    Assignee: B & J Manufacturing Company
    Inventor: Wayne E. Jensen
  • Patent number: 5035546
    Abstract: On-edge indexable insert for cutting radiused corners including circular arc cutting edges each with trailing surface formed with convex compound curvature as a toric segment intersecting the adjacent side wall to provide a planar abutment surface when a cutting edge is indexed to an inactive position.
    Type: Grant
    Filed: October 1, 1987
    Date of Patent: July 30, 1991
    Assignee: GTE Valenite Corporation
    Inventor: James A. Pawlik
  • Patent number: 4988241
    Abstract: A cutter body (22, 22') has a slot (26, 26') opening onto its nominal outer cylindrical surface (24) and extending along a plane that intersects the cutter axis (X) at an acute axial rake angle (A). A flat cutter blade insert (40) with an elliptical polycrystalline diamond cutting edge (48) is secured in the slot (26, 26'). The insert (40) is positioned to produce a non-negative radial rake at each point along the cutting edge (48). Preferably, the cutter (20, 20') has a plurality of circumferentially spaced slots (26, 26') and inserts (40). The slots (26') may be arranged in a herringbone pattern to resist delamination of a workpiece. Preferably, the cutter relief angle varies along the insert (40) from a minimum at the leading end (50) to a value at the trailing end (52) equal to the minimum plus the angle between the radial lines of the cylinder (24) through the leading and trailing ends (50, 52), respectively.
    Type: Grant
    Filed: September 15, 1989
    Date of Patent: January 29, 1991
    Assignee: The Boeing Company
    Inventor: Kevin J. Colligan
  • Patent number: 4963059
    Abstract: A rotary cutting tool includes a body having a cutting portion and an axis of rotation therethrough. The body has a plurality of helical flutes formed in a circumferential surface of the cutting portion in circumferentially spaced relation to one another and extending helically axially of the cutting portion so as to define a plurality of helical lands of a generally uniform land width spaced circumferentially of the cutting portion from one another. The body has a plurality of helical peripheral cutting edges each defined by a portion of an inner surface of a respective one of the helical flutes facing in a direction of rotation of the body and a surface of the land adjacent to the portion of the inner surface. At least one of the peripheral cutting edges has a helix angle different from helix angles of the other peripheral cutting edges. The peripheral cutting edges are equally spaced circumferentially of the body in at least one plane disposed perpendicularly to the axis of rotation of the body.
    Type: Grant
    Filed: February 24, 1989
    Date of Patent: October 16, 1990
    Assignee: Izumo Industrial Co., Ltd.
    Inventor: Nobuo Hiyama