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Golf club head

  • US 9,987,523 B2
  • Filed: 08/22/2016
  • Issued: 06/05/2018
  • Est. Priority Date: 12/23/2009
  • Status: Active Grant
First Claim
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1. A golf club assembly comprising;

  • a golf club head comprising a club head body having a crown portion, a toe portion, a heel portion, a rear portion, a hosel defining an upper opening, the hosel defining a hosel axis extending through the upper opening, the club head also having a sole portion defining a lower opening in communication with the upper opening;

    a club shaft having a lower end portion defining a club shaft axis;

    an adjustable loft system configured to allow a maximum loft change of about 0.5 degrees to about 3.0 degrees, the adjustable loft system including a shaft sleeve, wherein the shaft sleeve is mounted on the lower end portion of the shaft and adapted to be received in the upper opening of the club head, the shaft sleeve having a lower end portion defining a threaded opening, wherein the shaft sleeve, when inserted into the upper opening, supports the shaft relative to the club head such that the club shaft axis is angularly offset from the hosel axis;

    a screw having a screw head and an externally threaded screw shaft extending from the screw head and defining a longitudinal axis, wherein the shaft sleeve can be releasably secured to the club head by inserting the screw through the lower opening and tightening the screw into the threaded opening of the shaft sleeve such that the longitudinal axis of the screw shaft is aligned with the club shaft axis and angularly offset from the hosel axis; and

    a recess formed in the sole, and the recess having a single aperture that extends through the recess and the single aperture is configured to retain a fastener, wherein the single aperture is positioned rearward of a golf club head center of gravity and the single aperture defines a central axis that extends through the sole portion and the crown portion of the golf club head;

    wherein the club head body has a striking surface and a head origin defined as a position on the striking surface at approximately a geometric center of the striking surface, the head origin including a head origin x-axis, a head origin y-axis, and a head origin z-axis;

    wherein the head origin x-axis is tangential to the striking surface and generally parallel to a ground plane when the head is in an address position and a positive x-axis extends towards a heel portion;

    wherein the head origin y-axis extends perpendicular to the head origin x-axis and generally parallel to the ground plane when the head is in the address position and a positive y-axis extends from the striking surface and through the rear portion of the club head body;

    wherein the head origin z-axis extends perpendicular to the ground plane, and perpendicular to both the head origin x-axis and y-axis when the head is in the address position and a positive z-axis extends from the head origin and generally upward;

    wherein the golf club head center of gravity has a head origin x-axis coordinate greater than about −

    2 mm and less than about 8 mm and a head origin y-axis coordinate greater than about 25 mm and less than about 40 mm;

    wherein the golf club head center of gravity has a head origin z-axis coordinate less than about 0 mm; and

    wherein the golf club head has a moment of inertia about a center of gravity x-axis (CG x-axis), the CG x-axis is parallel to the head origin x-axis and passes through the center of gravity of the golf club head;

    wherein the golf club head has a moment of inertia about a center of gravity z-axis (CG z-axis), the CG z-axis is parallel to the head origin z-axis and passes through the center of gravity of the golf club head;

    wherein a golf club head moment of inertia about the CG x-axis is between about 200 kg·

    mm2 and 500 kg·

    mm2 and a moment of inertia about the CG z-axis is between about 350 kg·

    mm2 and about 600 kg·

    mm2.

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