By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors SHIMAHARA, Yuki (Kobe-shi, JP); KOHNO, Daisuke (Kobe-shi, JP), filed on March 10, 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 an iron type golf club set.
"Description of the Related Art
"Proposals in relation to a sole shape have been made in an iron type golf club set. In Japanese Examined Patent Application Publication No. H6-96049, a golf club set is disclosed, in which the curvature radius of a sole is decreased from a long iron club to a short iron club. Japanese Patent No. 3095052 discloses a golf club set including a head including a toe side guide surface and a heel side guide surface on a sole. The toe side guide surface and the heel side guide surface are inclined obliquely upward from a back side rear edge toward a face side front edge. In the set, the inclination is increased from a long iron to a short iron via a middle iron."
As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "In an iron type golf club set (iron set), each of iron numbers has different roles. In addition, an iron club is most commonly used when hitting a golf ball directly placed on grass, and is used in various situations where the inclinations of a ground, or the like are different. Furthermore, for example, high-level golf players tend to obtain desired hit balls by various swings, and iron clubs having excellent operativity are required. Therefore, various performances are required for the iron numbers in the iron set.
"As a result of the extensive studies, the present inventors have found that performances required for iron numbers of the iron set are more complicated than performances considered hitherto.
"The present embodiment provides an iron type golf club set which can satisfy various performances required for iron numbers in a set.
"In one aspect, an iron type golf club set includes two or more iron type golf clubs having loft angles different from each other. Each of the golf clubs includes a shaft, a head attached to a tip part of the shaft, and a grip attached to a rear end part of the shaft. The head includes a sole surface and a face surface having face lines. The sole surface includes a leading edge and a trailing edge. The trailing edge is curved so as to project toward a face side in a planar view of the sole surface. A sole width WSt at a toe reference position is decreased as the loft angle is increased. A sole width WSh at a heel reference position is decreased as the loft angle is increased.
"In another aspect, a sole width WSc at a central position of the face line is increased as the loft angle is increased.
"In another aspect, a difference (WSt-WSc) is decreased as the loft angle is increased. In another aspect, a difference (WSh-WSc) is decreased as the loft angle is increased.
"In another aspect, a curvature radius of the trailing edge in the planar view is increased as the loft angle is increased.
"In another aspect, the sole surface includes a ridgeline extending from a toe side toward a heel side, a leading surface extending between the ridgeline and the leading edge, and a trailing surface extending between the ridgeline and the trailing edge. The leading surface is inclined upward toward the face side. The trailing surface is inclined upward toward a back side.
"Various performances required for the iron type golf club set can be achieved."
For additional information on this patent application, see: SHIMAHARA, Yuki; KOHNO, Daisuke. Iron Type Golf Club Set. Filed March 10, 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=%2220170259132%22.PGNR.&OS=DN/20170259132&RS=DN/20170259132
Keywords for this news article include: Dunlop Sports Co. Ltd.
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