Patents Assigned to Sandvik AB
  • Arrangement in a rotatable device to protect against over-tightening
    Patent number: 5795116
    Abstract: A rotatable device, such as a screw, a bolt, etc., comprises a cylindrical clip (4) inserted into a bore (3) in the head of the rotatable device. The clip (4) is compressed to a certain extent when inserted into the bore in order to confer to the clip a springing effect on the wall of the bore. Further, the clip comprises a socket for the insertion of a suitable turning key. When turning the key, only a maximum torque is transferable to the rotatable device. If this value is exceeded, the clip starts sliding in the bore.
    Type: Grant
    Filed: March 10, 1997
    Date of Patent: August 18, 1998
    Assignee: Sandvik AB
    Inventors: Peter Frank, Klaus Kraft, Erwin Nitz, Magnus Aspeby
  • Percussion rock drill bit
    Patent number: 5794728
    Abstract: A rock drill bit for percussive drilling includes a head and a shank. The shank has a central boring in which a thread is provided. The thread cooperates with a corresponding thread in a drill string driven by a top hammer. The boring is connected to at least one fluid passage which emerges in or in the vicinity of a front face of the head. The fluid passage connects to a first groove which connects to a second groove, wherein at least three second grooves are provided and form between them axially forward lands. Each land carries a gauge insert. The gauge inserts are asymmetrically positioned on the drill bit, and the second groove extends radially inwards to or beyond an imaginary circle touching the radially innermost points of the inserts.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: August 18, 1998
    Assignee: Sandvik AB
    Inventor: Goran Palmberg
  • Binderless carbides for tribological applications
    Patent number: 5786076
    Abstract: A corrosion resistant material contains essentially WC, and 0.1 to 10 weight-%, preferably 0.5 to 5 weight-%, of one or more of the metallic carbides TiC, VC, NbC, TaC, Cr.sub.3 C.sub.2, ZrC or combinations thereof or with WC, and either spherical graphite and/or spherical hexagonal BN up to 10 volume-% with a size of about 3 .mu.m or 1-5 weight % of one or more of VN, Ti(C,N), CrN, ZrN. In applications with sliding surfaces, it has been found that the material has surprising results regarding low friction characteristics.
    Type: Grant
    Filed: December 11, 1995
    Date of Patent: July 28, 1998
    Assignee: Sandvik AB
    Inventors: Stefan Ederyd, Henri Pastor
  • Coated turning insert
    Patent number: 5786069
    Abstract: A coated turning insert particularly useful for turning of forged components of stainless steel low alloyed steel. The insert is characterized by a WC-Co cemented carbide body having a highly W-alloyed Co-binder phase and a coating including an innermost layer of TiC.sub.x N.sub.y O.sub.z with columnar grains and a top layer of fine grained .kappa.-Al.sub.2 O.sub.3.
    Type: Grant
    Filed: August 28, 1996
    Date of Patent: July 28, 1998
    Assignee: Sandvik AB
    Inventors: Bjorn Ljungberg, Leif kesson
  • Chain saw guide bar with liquid spray device
    Patent number: 5778537
    Abstract: Chain saw guide bar and method of using a guide bar for spraying liquid on a sawn surface through a plurality of orifices formed in a guide bar side plate. The liquid is introduced into an inlet portion of a passage formed in a center plate of the guide bar and is conducted forwardly to the orifices. The liquid is sprayed from the orifices at equal pressures, and in spray directions having a component oriented parallel to a centerline of the guide bar. Thus, by adjusting the velocity of the sprayed liquid, the length dimension of the area sprayed can be adjusted.
    Type: Grant
    Filed: February 27, 1997
    Date of Patent: July 14, 1998
    Assignee: Sandvik AB
    Inventor: Arvo Leini
  • Method and apparatus which removes odor and pollutants when preparing cullet for use in an electrostatic bed filter
    Patent number: 5773529
    Abstract: A method and apparatus for treating cullet before use as a raw material in a glass manufacturing process is disclosed. The method includes providing a bed of cullet; passing hot gases through the bed, the quantity and temperature of gases being sufficient to pyrolyze odor creating impurities within the bed of cullet; entraining volatile products of pyrolysis into gases leaving the moving bed; heating the gases leaving the bed to oxidize odor creating impurities; and discharging the gases to the atmosphere. The apparatus includes a housing containing a moving bed of cullet; a source of hot gases which permits the gases to pass through the moving bed of cullet to pyrolyze odor creating impurities within the cullet and entrain volatile products of pyrolysis into gases leaving the moving bed; and an incinerator to remove odor creating impurities from gases leaving the moving bed.
    Type: Grant
    Filed: September 25, 1996
    Date of Patent: June 30, 1998
    Assignee: Sandvik AB
    Inventor: Jeffrey C. Alexander
  • Diamond coated body
    Patent number: 5772366
    Abstract: The presently claimed invention discloses a compound body of a wear resistant substrate with a surface coating, which body is suitable for wear parts and tools applications. The body includes top and bottom surfaces and at least one peripheral wall extending therebetween, the intersection of said peripheral wall and at least said top surface forming a cutting edge. The surface coating on said body is a diamond coating of a thickness of 1-30 .mu.m deposited directly from the gas phase in a reactor by CVD or PVD technique in a manner so as to ensure rigid bonding to said carbide substrate. The top face is provided with an integral chipformer so as to provide chips formed during machining into a desired and controllable configuration.
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: June 30, 1998
    Assignee: Sandvik AB
    Inventors: Jorgen Wiman, Ingrid Reineck
  • Cutting tool insert
    Patent number: 5771763
    Abstract: An edge rounded cutting tool insert which shows less flank wear in the nose area and improved toughness behavior on the main cutting edge. The improved toughness and decreased flank wear is achieved by decreasing the W/H ratio and increasing H from the nose area to the middle of the main cutting edge wherein W is the width of edge rounding of the cutting edge along the rake face and H is the width of edge rounding of the cutting edge along the clearance face.
    Type: Grant
    Filed: March 24, 1997
    Date of Patent: June 30, 1998
    Assignee: Sandvik AB
    Inventors: Jonas Naslund, Anders Jonsson
  • Thread cutting insert
    Patent number: 5765972
    Abstract: A thread cutting insert comprises a center portion and a plurality of cutting corners project outwardly from the center portion. Each cutting corner comprises a pair of outwardly converging cutting edges which are joined together by a curved tip. Each cutting corner includes a chipbreaking protrusion extending upwardly higher than the upper face of the center portion of the insert. The protrusion includes a front portion facing the tip, and a pair of upwardly converging sides. The front portion and sides are spacially confined to the cutting corner.
    Type: Grant
    Filed: May 6, 1997
    Date of Patent: June 16, 1998
    Assignee: Sandvik AB
    Inventors: H.ang.kan Ericksson, Olle Lindstrom
  • Aluminum oxide coated cutting tool and method of manufacturing thereof
    Patent number: 5766782
    Abstract: A body such as a cutting tool coated with refractory single- or multilayers, wherein specific layers are characterized by a controlled microstructure and phase composition with crystal planes preferably grown in a preferential direction with respect to the surface of the coated body. The coating includes one or several refractory layers of which at least one layer is a dense, fine-grained layer of .alpha.-Al.sub.2 O.sub.3 preferably textured in the (104) direction. The coated tool exhibits excellent surface finish and shows much improved wear and toughness properties compared to prior art objects when used for machining steel, cast iron and, particularly, when machining nodular cast iron.
    Type: Grant
    Filed: December 29, 1994
    Date of Patent: June 16, 1998
    Assignee: Sandvik AB
    Inventor: Bjorn Ljungberg
  • Handle for a file having polygonal cross section
    Patent number: 5762344
    Abstract: A file of polygonal cross section is secured frictionally in a hole of a handle. The hole has as many corners as the file, and a surface extends between adjacent pairs of the corners of the hole. Each of those surfaces includes a concave segment and a convex segment. The concave segment is shaped such that relative rotation between the handle and file causes the corners of the file to tightly engage the concave segments to secure the file within the handle.
    Type: Grant
    Filed: December 5, 1996
    Date of Patent: June 9, 1998
    Assignee: Sandvik AB
    Inventor: Joacim Einvall
  • Segment plate for a saw blade and a saw blade with segment plates
    Patent number: 5761981
    Abstract: A circular saw blade includes a disc portion whose peripheral portion comprises a series of straight sections. A segment plate which carries at least one replaceable cutting member is attached to each straight section. Each segment plate has a first slot for receiving the cutting member and a second slot for receiving a clamping wedge. A portion of the segment plate disposed between the slots defines a clamping area which is pushed tightly against the cutting member by the clamping wedge. Each segment plate has a projection received in a recess of the disc.
    Type: Grant
    Filed: April 24, 1995
    Date of Patent: June 9, 1998
    Assignee: Sandvik AB
    Inventor: Karl-Heinz Stoffels
  • Process for making a cemented carbide with binder phase enriched surface zone
    Patent number: 5761593
    Abstract: A cemented carbide insert with improved toughness and resistance against plastic deformation containing WC and cubic phases of carbide and/or carbonitride in a binder phase based on Co and/or Ni with a binder phase enriched surface zone is disclosed. The binder phase content in the insert is 3.5-12 weight-%. In a zone below the binder phase enriched surface zone, the binder phase content is 0.85-1 of the binder phase content in the inner portion of the insert and the content of cubic phases is essentially constant and equal to the content in the inner portion of the insert. The insert is formed by sintering a cemented carbide containing a nitrogen-containing material in a vacuum or inert atmosphere and heat treating the sintered insert in nitrogen at 40-400 mbar at a temperature of 1280.degree.-1430.degree. C. for a time of 5-100 min.
    Type: Grant
    Filed: March 15, 1996
    Date of Patent: June 2, 1998
    Assignee: Sandvik AB
    Inventors: Ake Ostlund, Ulf Oscarsson, Per Gustafson, Leif Akesson
  • Method of precipitation hardening a metal alloy
    Patent number: 5759308
    Abstract: A precipitation hardened metallic alloy is provided in which the strengthening is based on the precipitation of particles. The strengthening particles have a quasicrystalline structure, said structure being essentially maintained at aging times up to 1000 h and tempering treatments up to 650.degree. C., the strengthening involving an increase in tensile strength of at least 200 MPa.
    Type: Grant
    Filed: January 3, 1997
    Date of Patent: June 2, 1998
    Assignee: Sandvik AB
    Inventors: Anna Hultin-Stigenberg, Jan-Olof Nilsson, Ping Liu
  • Batch loading system for CVD
    Patent number: 5759621
    Abstract: There is provided a method of coating cutting tool inserts by CVD methods with a completely covering coating. During the coating step, the inserts are resting in contact with the support in only a few tiny spots and sufficient space is allowed around each insert to ascertain optimum coating conditions. In a preferred embodiment, each insert rests on a peg allowing a rational production in larger scale and fully automatic CVD loading.
    Type: Grant
    Filed: August 28, 1996
    Date of Patent: June 2, 1998
    Assignee: Sandvik AB
    Inventors: Tor Norrgrann, Kjell Palsson, Bjorn Ljungberg, Ingemar Hessman
  • Cutting insert and tool holder for frictionally holding the insert
    Patent number: 5743162
    Abstract: Cutting insert and tool, wherein the tool has a seat formed by at least 190 degrees of a cylindrical seat surface, and the insert has an outwardly projecting region forming a cutting edge and three convex regions simultaneously touching the cylindrical seat surface at three distinct points. Those points form an imaginary triangle with all angles acute. A center of the cylindrical seat surface lies within the imaginary triangle, and a center of gravity of the insert lies outside of the imaginary triangle. The insert can only be removed from the seat after being rotated by a prescribed angle away from its cutting position.
    Type: Grant
    Filed: September 9, 1996
    Date of Patent: April 28, 1998
    Assignee: Sandvik AB
    Inventor: Erik Sundstrom
  • Cutting insert with chip control protrusion on a chip surface
    Patent number: 5743681
    Abstract: An indexable cutting insert for metal machining, in particular turning, is formed with banana- or C-shaped protrusions (11) adjacent to each operative cutting corner. The concave side of the protrusion faces in a direction towards the cutting corner. In comparison with corresponding inserts without such a protrusion a better chip control is achieved. Thus, the chip flow is led away from the machined surface both at small and large cutting depths and the chips are broken into suitable lengths.
    Type: Grant
    Filed: April 14, 1997
    Date of Patent: April 28, 1998
    Assignee: Sandvik AB
    Inventors: Jorgen Wiman, Sture Muren, Jan-Olof Olsson, Robert Isaksson
  • Methods of assembling a chain and a rivet for use in such assembly
    Patent number: 5729882
    Abstract: A saw chain of a chain saw has its side links and center links interconnected by rivets. Prior to being staked, each rivet is in blank form and includes a cylindrical flange and a pair of barrels extending from opposite sides of the flange along a center axis thereof. Each barrel includes an axially inner cylindrical section and a tapered axially outer section. When the rivet is staked, the center section of each barrel fills a cylindrical portion of a hole formed in a respective side link, and the tapered section fills a chamfered portion of the hole to form a rivet head. The staked rivet bears against a wall of the cylindrical portion of the hole with a greater force than that with which the rivet bears against a wall of the tapered portion of the hole.
    Type: Grant
    Filed: March 12, 1996
    Date of Patent: March 24, 1998
    Assignee: Sandvik AB
    Inventor: Thomas N. R. Travis
  • Cemented carbide with binder phase enriched surface zone
    Patent number: 5729823
    Abstract: The present invention relates to a cemented carbide insert, comprising a cemented carbide substrate and a coating. The substrate contains WC and cubic carbonitride phase in a binder phase based of Co and/or Ni and has a binder phase enriched surface zone essentially free of cubic phase. The binder phase enriched surface zone prevails over the edge. As a result, an insert according to the invention has improved edge toughness and resistance against plastic deformation and is particularly useful for machining of sticky work piece materials such as stainless steel.
    Type: Grant
    Filed: March 14, 1996
    Date of Patent: March 17, 1998
    Assignee: Sandvik AB
    Inventors: Per Gustafson, Leif kesson
  • Cutting insert
    Patent number: D393270
    Type: Grant
    Filed: September 27, 1996
    Date of Patent: April 7, 1998
    Assignee: Sandvik AB
    Inventors: Sture Muren, Jorgen Wiman