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4-Traders Homepage  >  Equities  >  Tokyo  >  Dunlop Sports Co Ltd    7825   JP3161300003

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Dunlop Sports : Researchers Submit Patent Application, "Golf Club Shaft", for Approval (USPTO 20170259138)

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09/28/2017 | 10:15pm CEST

By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventor NAKAMURA, Hirotaka (Kobe-shi, JP), filed on March 13, 2017, was made available online on September 21, 2017.

The patent's assignee is Dunlop Sports Co. Ltd.

News editors obtained the following quote from the background information supplied by the inventors: "Field of the Invention

"The present invention relates to a golf club shaft.

"Description of the Related Art

"In shafts obtained using prepregs, bias layers are usually used. In light of crushing rigidity or the like, shafts including hoop layers are known.

"Japanese Patent Application Laid-Open Publication No. 2009-22622 (US2009/0029792) discloses a constitution including a partial hoop layer in addition to a full length hoop layer.

"Japanese Patent Application Laid-Open Publication No.

"2009-60983 discloses a constitution including two bias layers and a hoop layer disposed at a position where the hoop layer is brought into contact with an outer bias layer of the two bias layers.

"Japanese Patent Application Laid-Open Publication No. 2013-150775 (US2013/0165250) discloses a constitution including three bias layers. One bias layer of the three bias layers includes a pitch-based carbon fiber, and the remaining two bias layers include a PAN-based carbon fiber."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "It has become clear that the behavior of a shaft during swing is optimized by more optimally disposing a hoop layer having a specific specification. Furthermore, it became clear that a non-conventional synergistic effect is obtained by combining the hoop layer with a specific bias layer. As a result, both a high head speed and directional stability can be achieved by combining the hoop layer with the bias layer.

"The present embodiments provide golf club shafts which can achieve a high head speed and directional stability.

"In one aspect, A shaft includes a plurality of layers formed by fiber reinforced resins. The plurality of layers include a hoop layer and a bias layer. The hoop layer includes a full length hoop layer constituted with a prepreg having a fiber elastic modulus of equal to or greater than 30 (tf/mm.sup.2) and having a fiber weight per unit area of 50 (g/m.sup.2) or greater but 80 (g/m.sup.2) or less. The bias layer includes a high elasticity containing bias layer constituted with a prepreg containing a high elastic pitch-based carbon fiber having a fiber elastic modulus of equal to or greater than 80 (tf/mm.sup.2).

"In another aspect, the full length hoop layer is disposed outside the high elasticity containing bias layer.

"Preferably, the hoop layer is constituted with only the one full length hoop layer.

"In another aspect, a fiber elastic modulus of the full length hoop layer is 33 (tf/mm.sup.2) or greater but 40 (tf/mm.sup.2) or less.

"In another aspect, the fiber elastic modulus of the high elastic pitch-based carbon fiber is equal to or greater than 90 (tf/mm.sup.2).

"In another aspect, the high elasticity containing bias layer is constituted with a prepreg containing the high elastic pitch-based carbon fiber having a fiber elastic modulus of equal to or greater than 80 (tf/mm.sup.2) and a carbon fiber having a fiber elastic modulus of equal to or less than 40 (tf/mm.sup.2).

"In another aspect, the high elasticity containing bias layer is constituted with a prepreg containing the high elastic pitch-based carbon fiber and a PAN-based carbon fiber."

For additional information on this patent application, see: NAKAMURA, Hirotaka. Golf Club Shaft. Filed March 13, 2017 and posted September 21, 2017. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220170259138%22.PGNR.&OS=DN/20170259138&RS=DN/20170259138

Keywords for this news article include: Asia, Japan, Dunlop Sports Co. Ltd..

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2017, NewsRx LLC

(c) 2017 NewsRx LLC, source Government & Education Newsletters

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