HOLLOW GOLF CLUB HEAD HAVING SOLE STRESS REDUCING FEATURE

摘要

A hollow golf club head incorporating a stress reducing feature including at least one sole located stress reducing feature located at least partially on the sole. The location and size of the sole stress reducing feature, and their relationship to one another and other club head engineering variables, play a significant role in selectively influencing deflection and performance of the face.

主权项

1. A hollow golf club head (400) comprising:
(i) a face (500) positioned at a front portion (402) of the golf club head (400) where the golf club head (400) impacts a golf ball, opposite a rear portion (404) of the golf club head (400), wherein the face (500) includes an engineered impact point (EIP), a top edge height (TEH), and a lower edge height (LEH); (ii) a sole (700) positioned at a bottom portion of the golf club head (400); (iii) a crown (600) positioned at a top portion of the golf club head (400); (iv) a bore having a center that defines a shaft axis (SA) which intersects with a horizontal ground plane (GP) to define an origin point, wherein the bore is located at a heel side (406) of the golf club head (400), and wherein a toe side (408) of the golf club head (400) is located opposite of the heel side (406); (v) a center of gravity (CG) located:
(a) vertically toward the crown (600) of the golf club head (400) from the origin point a distance Ycg;(b) horizontally from the origin point toward the toe side (408) of the golf club head (400) a distance Xcg; and(c) a distance Zcg from the origin toward the rear portion (404) in a direction generally orthogonal to the vertical direction used to measure Ycg and generally orthogonal to the horizontal direction used to measure Xcg; (vi) wherein the engineered impact point (EIP) is located:
(a) vertically toward the crown (600) of the golf club head (400) from the origin point a distance Yeip, wherein 0.5″>(Yeip−Ycg)>−0.5″;(b) horizontally from the origin point toward the toe side (408) of the golf club head (400) a distance Xeip that is generally parallel to the face (500) and the ground plane (GP), wherein 0.5″>(Xeip−Xcg)>−0.5″; and(c) a distance Zeip from the origin toward the face (500) in a direction generally orthogonal to the vertical direction used to measure Ycg and generally orthogonal to the horizontal direction used to measure Xcg, wherein (Zeip+Zcg)<2.0″; (vii) wherein the face (500) has a blade length (BL) measured horizontally from the origin point toward the toe side (408) of the golf club head (400) to the most distant point on the golf club head in this direction, wherein the blade length (BL) includes a toe blade length section (Bbl) and a heel blade length section (Abl) measured in the same direction as the blade length (BL) from the origin point to the engineered impact point (EIP), wherein the heel blade length section (Abl) is at least 0.8 inches; and (viii) a stress reducing feature (1000) including a sole located SRF (1300) located at least partially on the sole (700), wherein the sole located SRF (1300) has a SSRF length (1310), a SSRF leading edge (1320) having a SSRF leading edge offset (1322), a SSRF width (1340), and a SSRF depth (1350, wherein the maximum SSRF width (1340) is at least ten percent of the Zcg distance and the maximum SSRF depth (1350) is at least ten percent of the Ycg distance, and wherein the face (500) has a characteristic time of at least 220 microseconds.