Iron golf club and method for manufacturing the same
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United States of America Patent
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Dec 16, 2014
Grant Date -
Aug 18, 2011
app pub date -
Feb 16, 2011
filing date -
Feb 17, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
In order to sharpen and harden a corner portion of a score line edge portion of an iron golf club having a plurality of score lines on a face surface within a prescribed range, heat input is implemented on an edge portion of a groove through laser irradiation after the groove is machined and, as a result, the edge portion is hardened and melted to form a rounded corner R. The hardness is set at a Vickers hardness value (HV) of at least 350. The corner R forms a part of a contour line of the edge portion and this contour line is formed to exist between a first circle that contacts the face surface and a side surface of the groove and has a radius of 0.010 inches (0.254 millimeters) and a second circle that is concentric with the first circle and has a radius of 0.011 inches (0.2794 millimeters).
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