Patents Assigned to Dunlop Sports Co. Ltd.
  • GOLF BALL
    Publication number: 20140206476
    Abstract: An object of the present invention is to provide a golf ball showing a low spin rate on driver shots. The present invention provides a golf ball comprising a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing (a) a base rubber, (b) an ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator and (d) a carboxylic acid having a heterocyclic ring and/or a salt thereof, provided that the rubber composition further contains (e) a metal compound in case of containing only (b) the ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent.
    Type: Application
    Filed: January 17, 2014
    Publication date: July 24, 2014
    Applicant: Dunlop Sports Co. Ltd.
    Inventors: Ryota SAKAMINE, Chiemi MIKURA, Ayaka SHINDO
  • GOLF CLUB HEAD WITH TEXTURED STRIKING FACE
    Publication number: 20140206473
    Abstract: A golf club head includes a heel portion, a toe portion, a hosel, and a striking face. The striking face includes a plurality of scorelines each having an average depth no less than about 0.10 mm, a plurality of first micro-grooves each having an average depth no greater than about 0.010 mm, and a plurality of second micro-grooves overlaid on the first micro-grooves, each of the second micro-grooves having an average depth greater than the average depth of the first micro-grooves. Some embodiments can also have a plurality of textured surface treatment regions superimposed on the overlaid first and second micro-grooves so as to at least partially intersect the micro-grooves.
    Type: Application
    Filed: February 6, 2014
    Publication date: July 24, 2014
    Applicant: Dunlop Sports Co. Ltd.
    Inventors: Patrick Ripp, Roberto Aguayo, Jeffrey D. Brunski, Matthew R. Daraskavich, Sharon J. Park
  • Golf club shaft and golf club using the same
    Patent number: 8777772
    Abstract: A golf club shaft extending from a tip end to a butt end and made of fiber reinforced resin, comprises a weight being in a range of from 30 to 55 g, a whole length LS between the tip end and the butt end, a center of gravity of the shaft located with a distance LG from the tip end, a ratio of the distance LG to the whole length LS being in a range of from 0.54 to 0.65, a tip end portion which has a length of 300 mm from the tip end toward the butt end, the tip end portion including fibers including a pitch based carbon fiber and a PAN based carbon fiber, and said fibers in the tip end portion comprising, in weight, the pitch based carbon fiber of from 15 to 25% and the PAN based carbon fiber of from 85 to 75%.
    Type: Grant
    Filed: October 4, 2012
    Date of Patent: July 15, 2014
    Assignee: Dunlop Sports Co. Ltd.
    Inventors: Hiroshi Hasegawa, Takashi Nakano
  • GOLF CLUB HEAD
    Publication number: 20140187347
    Abstract: A head body h1 includes a recess part 14 for a socket. A socket 10 is attached to the recess part 14 for a socket. A weight body 12 is detachably attached to the socket 10. The weight body 12 can be secured by relative rotation of an angle +?°. The weight body 12 can be detached by relative rotation of an angle-?°. The weight body 12 includes an engaging part 32. The socket 10 includes a first hole part 18 and a second hole part 20. The engaging part 32 can take an engaging position EP and a non-engaging position NP at the second hole part 20 by the relative rotations. A sectional shape of the engaging part 32 has N-fold rotation symmetry. N is an integer of 1 or greater and 3 or less.
    Type: Application
    Filed: December 23, 2013
    Publication date: July 3, 2014
    Applicant: Dunlop Sports Co., Ltd.
    Inventor: Akio YAMAMOTO
  • GOLF BALL
    Publication number: 20140187356
    Abstract: A golf ball 2 has a large number of dimples 8 on a surface thereof. A trajectory of the golf ball 2 is divided into first to fourth segments. An average CD1 of drag coefficients CD and an average CL1 of lift coefficients CL in the first segment are equal to or less than 0.225 and 0.180, respectively. An average CD2 of drag coefficients CD and an average CL2 of lift coefficients CL in the second segment are equal to or less than 0.250 and 0.220, respectively. An average CD3 of drag coefficients CD and an average CL3 of lift coefficients CL in the third segment are equal to or greater than 0.260 and 0.220, respectively. An average CD4 of drag coefficients CD and an average CL4 of lift coefficients CL in the fourth segment are equal to or greater than 0.250 and 0.200, respectively.
    Type: Application
    Filed: December 9, 2013
    Publication date: July 3, 2014
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Hyoungchol KIM, Masahide ONUKI
  • Measuring method of golf club head
    Patent number: 8758151
    Abstract: A head measuring method of the present invention includes: (a) preparing a golf club having a head having a plurality of markers provided thereon; (b) photographing the head by a camera disposed at a position, wherein a backward distance between the position and a center point of a ball is equal to or greater than 0, to obtain a head image near an impact; and (c) analyzing the head image to calculate a position and attitude of the head near the impact. Preferably, three or more combinations of the markers set such that the marker interval is equal to or greater than a head vertical width exist.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: June 24, 2014
    Assignee: Dunlop Sports Co. Ltd.
    Inventors: Wataru Kimizuka, Masahide Onuki
  • GOLF CLUB
    Publication number: 20140155190
    Abstract: A club 2 includes a head 4, a shaft 6 and a grip 8. A club length L1 is 45 inches or greater and 48 inches or less. A ratio (Wh/Wc) of a head weight Wh to a club weight Wc is equal to or greater than 0.71. A moment of inertia Ix about an axis of a swing is equal to or less than 6.90×103 (kg·cm2).
    Type: Application
    Filed: December 2, 2013
    Publication date: June 5, 2014
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventor: Takashi NAKAMURA
  • Golf club head
    Patent number: 8727908
    Abstract: A golf club head with a hollow comprises a face portion whose front face defines a clubface for hitting a ball, the face portion comprising a central thicker portion provided in a center region thereof and a peripheral thinner portion provided around the central thicker portion and with a thickness smaller than that of the central thicker portion, the inner surface of the peripheral thinner portion comprising a first region and a second region, the first region being provided with a plurality of first grooves which extend straightly in a certain direction, and the second region being provided with a plurality of second grooves which extend straightly in the different direction of first grooves.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: May 20, 2014
    Assignee: Dunlop Sports Co. Ltd.
    Inventor: Masato Goto
  • Golf ball
    Patent number: 8721473
    Abstract: A first golf ball 2 includes a core 4, a mid-layer 6, and a cover 8. The core 4 includes a center 10 and an envelope layer 12. The mid-layer 6 includes a metal ion source (C) that can neutralize an ionomer resin. The mid-layer 6 has a melt flow rate (at 190° C. and 2.16 kg) of 4 g/10 minute or greater. The difference (H3?H1) between the JIS-C hardness H3 of the cover 8 and the JIS-C central hardness H1 of the center 10 is equal to or greater than 45. A second golf ball 22 includes a core 24, a mid-layer 28, and a cover 30. The mid-layer 28 has a melt flow rate (at 190° C. and 2.16 kg) of 4 g/10 minute or greater. Preferably, the mid-layer 28 includes a high melt viscosity resin (A), a low melt viscosity ionomer resin (B), and a metal ion source (C1).
    Type: Grant
    Filed: July 22, 2013
    Date of Patent: May 13, 2014
    Assignee: Dunlop Sports Co. Ltd.
    Inventors: Kazuhiko Isogawa, Tsutomu Hirau, Hirotaka Nakamura, Takahiro Shigemitsu
  • PROCESS FOR DESIGNING RUGGED PATTERN ON GOLF BALL SURFACE
    Publication number: 20140128179
    Abstract: A golf ball has, on a surface thereof, a rugged pattern composed of a land and a large number of dimples. A method for designing the rugged pattern includes the steps of: (1) assuming a large number of circles on a surface of a phantom sphere; (2) assuming a large number of generating points 16 based on positions of the large number of circles; (3) assuming a large number of Voronoi regions 18 on the surface of the phantom sphere by a Voronoi tessellation based on the large number of generating points 16; and (4) assigning a dimple and a land to the surface of the phantom sphere based on contours of the large number of Voronoi regions 18.
    Type: Application
    Filed: November 6, 2013
    Publication date: May 8, 2014
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Hyoungchol KIM, Masahide ONUKI, Takahiro SAJIMA, Kohei MIMURA
  • ADJUSTABLE GOLF CLUB
    Publication number: 20140121035
    Abstract: In an embodiment, a golf club includes a striking face, a top portion, a sole portion opposite the top portion, and a shaft assembly. The shaft assembly can include a shaft having a butt end and a tip end, and a shaft sleeve located at the tip end, the shaft sleeve including indicia, and a hosel extending from the top portion. The hosel can include a sidewall, an internal bore for receiving the shaft assembly, and an aperture extending through, and circumscribed by, the sidewall such that the indicia of the shaft sleeve corresponds with the aperture.
    Type: Application
    Filed: October 31, 2012
    Publication date: May 1, 2014
    Applicant: DUNLOP SPORTS CO., LTD.
    Inventor: Dan S. NIVANH
  • GOLF CLUB HEAD
    Publication number: 20140106903
    Abstract: A golf club head has a hollow and comprises a face portion having a club face for hitting a ball, a sole portion defining a bottom face of the club head, and a hosel into which a tip end of a golf club shaft is inserted. The hosel protrudes into the hollow. The sole portion is provided in its club face side with a thick ribbed part having a thickness of from 3.0 to 10.0 mm and extending in the toe-heel direction of the head. In the hollow, the ribbed part is connected to the hosel.
    Type: Application
    Filed: October 16, 2013
    Publication date: April 17, 2014
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventor: Hirotaka NAKAMURA
  • A GOLF CLUB HEAD
    Publication number: 20140106904
    Abstract: A golf club head according to one or more aspects of the present invention may include a main cavity having at least one auxiliary cavity and a base surface. An insert may be associated with the base surface and may comprise at least two contact elements, with a bridge member disposed therebetween. Different contact elements of the insert may be disposed in separate respective auxiliary cavities, such that each contact element may be associated with the base surface. The bridge member of the insert may be dissociated from the base surface. Moreover, a surface coating may be selectively applied to the head to permit a durable adhesive bond between the insert and the base surface.
    Type: Application
    Filed: December 13, 2013
    Publication date: April 17, 2014
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Sharon J. PARK, Douglas E. ROBERTS, Andrew P. CHICK
  • GOLF CLUB SHAFT
    Publication number: 20140106895
    Abstract: A shaft 6 includes full length layers provided wholly in a longitudinal direction of the shaft, and a tip end partial layer provided on a tip part of the shaft. The full length layers include a bias layer and a straight layer. The tip end partial layer includes an inner glass fiber reinforced layer. When a full length of the shaft is defined as Ls, and a distance between a tip end of the shaft and a center of gravity G of the shaft is defined as Lg, a ratio (Lg/Ls) is equal to or greater than 0.52 and equal to or less than 0.65. A weight of the shaft is equal to or less than 65 g. Preferably, the inner glass fiber reinforced layer is positioned inside the bias layer.
    Type: Application
    Filed: October 16, 2013
    Publication date: April 17, 2014
    Applicant: Dunlop Sports Co. Ltd.
    Inventors: Hiroshi HASEGAWA, Kiyofumi MATSUNAGA, Takeshi SHIMAUCHI
  • Golf club
    Patent number: 8668597
    Abstract: A golf club 2 is provided with a head 4, a shaft 6, a tip member 8, and a screw member 10. The shaft 6 is inserted into a shaft hole of the tip member 8, and a tip part of the shaft 6 is fixed to the shaft hole. An axis line s1 of the shaft 6 is inclined with respect to an axis line z1 of the tip member 8. The head 4 has a head hole into which the tip member is inserted, a head side engaging part capable of being engaged with the tip member 8 inserted into the head hole, and a through hole into which the screw member 10 can be inserted. The tip member 8 has a shaft side engaging part 38 capable of being engaged with the head side engaging part. Circumferential relative positions A in which the head side engaging part and the shaft side engaging part can be engaged with each other are M kinds.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: March 11, 2014
    Assignee: Dunlop Sports Co. Ltd.
    Inventor: Akio Yamamoto
  • GOLF CLUB
    Publication number: 20140057733
    Abstract: A golf club 2 is provided with a head 4, a shaft 6, a tip member 8, and a screw member 10. The shaft 6 is inserted into a shaft hole of the tip member 8, and a tip part of the shaft 6 is fixed to the shaft hole. An axis line s1 of the shaft 6 is inclined with respect to an axis line z1 of the tip member 8. The head 4 has a head hole into which the tip member is inserted, a head side engaging part capable of being engaged with the tip member 8 inserted into the head hole, and a through hole into which the screw member 10 can be inserted. The tip member 8 has a shaft side engaging part 38 capable of being engaged with the head side engaging part.
    Type: Application
    Filed: October 29, 2013
    Publication date: February 27, 2014
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventor: Akio YAMAMOTO
  • Striking face for golf club head
    Patent number: D707316
    Type: Grant
    Filed: April 19, 2013
    Date of Patent: June 17, 2014
    Assignee: Dunlop Sports Co., Ltd.
    Inventors: Roberto Aguayo, Jeffrey D. Brunski, Matthew R. Daraskavich, Patrick Ripp
  • Striking face for golf club head
    Patent number: D707317
    Type: Grant
    Filed: June 13, 2013
    Date of Patent: June 17, 2014
    Assignee: Dunlop Sports Co., Ltd.
    Inventors: Roberto Aguayo, Jeffrey D. Brunski, Matthew R. Daraskavich, Patrick Ripp
  • Golf club head
    Patent number: D709971
    Type: Grant
    Filed: July 10, 2013
    Date of Patent: July 29, 2014
    Assignee: Dunlop Sports Co. Ltd.
    Inventors: Nick Trahan, Thomas Carlson, Chris Cooper, Adam Sheldon
  • Golf club head
    Patent number: D709972
    Type: Grant
    Filed: July 10, 2013
    Date of Patent: July 29, 2014
    Assignee: Dunlop Sports Co. Ltd.
    Inventors: Nick Trahan, Thomas Carlson, Chris Cooper, Adam Sheldon