Abstract: The present invention relates to a golf club head having multiple undercuts. The club head includes a body defining a striking face, a top line, a sole, and a back, and having a heel and a toe. The back contains a cavity. Multiple undercuts in the form of a plurality of recesses are provided within the cavity. The recesses extend away from the cavity. The recesses may be oriented in a variety of ways. In a first arrangement, the recesses are aligned longitudinally to the striking face in a heel-to-toe direction. In a second arrangement, the recesses are recesses are aligned transverse to the striking face in a front-to-back direction and extend in a heel-to-toe direction. In a third arrangement, the plurality of recesses includes both longitudinally arranged and transversely arranged recesses. An insert, such as a weight insert, a dampening insert, or a combination insert, is preferably positioned within each of the recesses.

Abstract: A hollow golf club head with a concave portion is disclosed and claimed. The club head includes a metallic portion and a light-weight portion, which may be formed of plastic, composite, or the like. The concave portion allows the club designer to make a club head having very thin portions while still maintaining the requisite structural integrity. Convex bulges may optionally be provided to house weight inserts to enhance the playing characteristics of the golf club. The metallic portion of the club head may take on the appearance of a frame, into which several light-weight inserts are positioned. These light-weight inserts may be positioned in the crown, skirt, and sole of the club head. The club head may be formed by co-molding, eliminating the need for welding or adhesives, freeing mass to be used in more beneficial ways. The club head may be large to increase playability and forgiveness.

Abstract: A golf club head having a cavity back design with a cavity therein for placement of lightweight dual-durometer silicone. The club head is prepared by brushing an adhesive onto the interior wall, but omitting a pre-selected area of the wall to allow silicone to shrink away at the omitted area to allow for control of the shrinkage. A first shot of 80 Shore A silicone is placed into the cavity and disposed against the interior wall. Next, a softer 50 Shore A silicone is juxtaposed against the first shot of silicone and it is pressed using a hot mold finishing tool wherein a substantial portion of the cavity is filled. A polycarbonate insert is attached to an outer surface of the second silicone to provide a zero gap appearance. A tan delta ratio of the first silicone to the second silicone is greater than 1.6. A storage modulus of the first silicone is at least three times greater than the second silicone. And, a loss modulus of the first silicone is at least ten times the second silicone.

Abstract: A weight adjusting structure of a golf club head comprises a 360-degree rotatable rotary table installed in a body of a golf club head, wherein the rotary table is combined with an incomplete annular weight block at a peripheral portion on an arbitrary side thereof, so that the rotary table and the weight block form a rotary table assembly whose weight orientation can be adjusted. The weighted rotary table assembly installed in the body of the golf club head can be used to adjust a distribution of different weights around 360 degrees, whereby a preferred location of the club head's gravity center can be set according to a golfer's swing posture and a location of the club head's gravity center the golfer is used to.

Abstract: A golf club head having a deep undercut is disclosed and claimed. The club head includes a cavity in a back portion thereof, opposite the striking face. A recess is provided in the back portion of the club head in proximity of the heel and, optionally, the sole. The recess may extend to the hosel bore, and may be separate from the cavity. An insert, such as a dampening member or a weight member, may be positioned within the recess. The recess and any insert provided therein alter the club head moment of inertia and center of gravity location, providing an improved feel to the golf club.

Abstract: A golf club head for an iron has a dual sole comprising first and second discontinuous surfaces which intersect along a diagonal line between the leading edge of the head at the toe and an intermediate point on a trailing edge of the head. The soles progressively taper from the long irons to the short irons so that the intersection of the diagonal line with the trailing edge is progressively closer to the toe. The head construction reduces weight in the toe and ground contact in the toe area, and moves the center of resistance toward the heel of the club. This reduces head droop and the tendency of the toe to dig into the ground, and, minimizes opening of the face at impact.

Abstract: A golf club head, specifically a wood for use on the fairway or in trouble spots, such as sand traps, hard pan, or in the rough. The wood incorporates a metal sole plate which comprises a major portion of the lower face of the head and at least half of the total weight of the head. The sole plate has a pair of spaced parallel runners extending well below the plate and being of substantial cross section, the runners having inclined leading faces to ride or skid on the ground surface with minimum penetration. The weight and shape of the sole plate provides a low center of mass in the head, with the weight distributed over the lower face.