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

DUNLOP SPORTS CO LTD (7825)
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Dunlop Sports : Patent Issued for Golf Club Head (USPTO 9770635)

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10/05/2017 | 06:55pm CET

By a News Reporter-Staff News Editor at Journal of Engineering -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Motokawa, Yuki (Kobe, JP); Yamasawa, Kota (Kobe, JP), filed on February 25, 2016, was published online on September 26, 2017.

The assignee for this patent, patent number 9770635, is DUNLOP SPORTS CO. LTD. (Kobe-Shi, Hyogo, JP).

Reporters obtained the following quote from the background information supplied by the inventors: "The present invention relates to a golf club head comprising a head main body and a weight member, more particularly to a golf club head having a large moment of inertia.

"U.S. Pat. No. 8,328,661 discloses a hollow golf club head comprising a cup-shaped face member, and a head main body joined thereto in order to provide a shallow and low center of gravity for the head. A tongue-shaped weight member extending in the toe-heel direction is fixed to a sole portion of the head main body. The weight member extends toward the front so as to be positioned in a cavity of the face member."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "In the above-mentioned head, since the weight member is fixed to the inner surface of the sole portion, the sole portion has a high flexural rigidity. Therefore, the head main body of the above-mentioned head is hard to deflect at the time of striking a ball, and there is a possibility that the rebound performance is deteriorated. Further, there is a problem such that the moment of inertia about a vertical axis passing through the center of gravity of the head (hereinafter, simply referred to the 'moment of inertia') is small.

"In view of the above problems, the present invention was made, and a primarily object the present invention is to provide a golf club head having a large moment of inertia.

"According to a first aspect of the present invention, a golf club head comprises

"a head main body comprising a face portion, a crown portion and a sole portion, and having a hollow therein, and

"a weight member disposed within the hollow, wherein

"the weight member extends continuously between its toe side end portion fixed to a toe side part of the head main body, and its heel side end portion fixed to a heel side part of the head main body,

"in a vertical plane including the center of gravity of the head and a sweet spot of a club face of the face portion, the weight member does not contact with the inner surface of the head main body, and

"a cross-sectional area of the weight member measured in parallel with the above-mentioned vertical plane is smaller in its central portion in the toe-heel direction than in a heel side portion and a toe side portion of the weight member.

"In the first aspect of the present invention, it is preferable that the above-mentioned central portion of the weight member includes the above-mentioned vertical plane.

"In the first aspect of the present invention, it is preferable that the center of gravity of the weight member is located on the face portion side of the center of gravity of the head.

"In the first aspect of the present invention, it is preferable that the center of gravity of the weight member is located on the sole portion side of the center of gravity of the head.

"In the first aspect of the present invention, it is preferable that the weight member is provided with a concave portion recessed toward the face portion.

"In the first aspect of the present invention, it is preferable that the above-mentioned concave portion of the weight member has a substantially triangular shape in a plan view of the weight member.

"In the first aspect of the present invention, it is preferable that the above-mentioned concave portion of the weight member has a circular arc shape in the plan view of the weight member.

"In the first aspect of the present invention, it is preferable that the above-mentioned concave portion of the weight member is formed as a curved shape along a circular arc whose center is located within 3 mm from the center of gravity of the head in the plan view.

"According to a second aspect of the present application, a golf club head comprises

"a head main body having a hollow therein, and

"weight members disposed within the hollow, wherein

"the weight members include a toe-side weight member and a heel-side weight member,

"the toe-side weight member has a toe-side end portion fixed to a toe side part of the head main body and extends from the toe-side end portion toward a heel side of the head main body without contacting with the inner surface of the head main body so as to have a heel-side end terminated within the hollow,

"the heel-side weight member has a heel-side end portion fixed to a heel side part of the head main body and extends from the heel-side end portion toward a toe side of the head main body without contacting with the inner surface of the head main body so as to have a toe-side end terminated within the hollow, and

"the heel-side end and the toe-side end are spaced apart from each other.

"In the second aspect of the present invention, it is preferable that, between the heel-side end and the toe-side end, a space is formed in the toe-heel direction of the head, and the space is increased toward the backward of the head in its plan view.

"In the second aspect of the present invention, it is preferable that, in the plan view, the heel-side end and the toe-side end are curved along a circle arc whose center is located within 3 mm from the center of gravity of the head.

"In the second aspect of the present invention, it is preferable that a depth of the center of gravity of the head from the club face is not less than a progression of the club face and not more than 27.0 mm, and a moment of inertia of the head around a vertical axis passing through the center of gravity of the head is not less than 2700 g sq. cm.

"In the second aspect of the present invention, it is preferable that a percentage depth of the center of gravity is in a range of from {100.times.face progression (mm)/maximum dimension (mm) of the head in the front-back direction} % to 33.0%, wherein the percentage depth of the center of gravity is 100.times.the depth of the center of gravity (mm)/the maximum dimension (mm) of the head in the front-back direction.

"In the second aspect of the present invention, it is preferable that the moment of inertia of the head around the vertical axis passing through the center of gravity of the head is not less than 2800 g sq. cm.

"In the second aspect of the present invention, it is preferable that the head comprises an adjuster for changing the position of the toe-side weight member or the heel-side weight member in at least one of the front-back direction of the head, the up-down direction of the head, and the toe-heel direction of the head.

"Therefore, in the golf club head according to the first or second aspect of the present invention, the weight member does not increase the rigidity of the sole portion excessively, and as a result, high rebound performance can be obtained. Further, the weight member can distribute more weight to a toe side and a heel side of the head, therefore, the golf club head is provided with a large moment of inertia, and the directionality of the hit ball is stabilized if missed shot.

"In this application, dimensions, positions, directions and the like relating to the club head refer to those under a standard state of the club head unless otherwise noted.

"Here, the standard state of the club head is such that the club head is set on a horizontal plane HP so that the axis of the club shaft (not shown) is inclined at the specified lie angle while keeping the axis on a vertical plane, and the face forms the specified loft angle with respect to the horizontal plane HP and the specified face angle. Incidentally, in the case of the club head alone, the center line of the shaft inserting hole can be used instead of the axis CL of the club shaft.

"The sweet spot SS is a point of intersection between the club face 2a and a straight line N drawn from the center CG of gravity of the head perpendicularly to the club face 2a.

"The front-back direction is a direction parallel with the straight line N projected on the horizontal plane HP.

"The toe-heel direction is a direction parallel with the horizontal plane HP and perpendicular to the front-back direction."

For more information, see this patent: Motokawa, Yuki; Yamasawa, Kota. Golf Club Head. U.S. Patent Number 9770635, filed February 25, 2016, and published online on September 26, 2017. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=9770635.PN.&OS=PN/9770635RS=PN/9770635

Keywords for this news article include: 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 Science Newsletters

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