Abstract: The invention generally relates to golf clubs with adjustable mass properties. In certain aspects, the invention provides methods and mechanisms for adjusting a club head center of gravity and/or moment of inertia by way of an adjustable weight assembly positionable along the sole of the club head body. When in a first position, the weight assembly provides a lower center of gravity so as to increase launch angle and reduce spin rate, resulting in greater overall distance of ball flight. When in a second position, the weight assembly provides a greater mass moment of inertia, which effectively enlarges the sweet spot and produces a more forgiving club for off-center hits.

Abstract: The invention provides a golf club head with a fully removable component that can withstand the stress of repeated hits. When assembled, the removable component is held in place by a fastening mechanism that includes structural elements that distribute the holding force across the component and tend to equalize the forces around the periphery where the component meets the body. The fastening mechanism may include a post that reaches across the open space within the hollow club head, pulling the removable component towards an opposed main club head body. Since a golf club of the present invention can be opened, it may include a mechanism on the inside for use by a golfer, such as an electronic device or an adjustment mechanism. The golf club may include a weight adjustment system that allows the club to be custom-fitted to a golfer.

Abstract: The invention generally relates to golf clubs with adjustable mass properties. In certain aspects, the invention provides methods and mechanisms for adjusting a club head center of gravity and/or moment of inertia by way of an adjustable weight assembly positionable along the sole of the club head body. When in a first position, the weight assembly provides a lower center of gravity so as to increase launch angle and reduce spin rate, resulting in greater overall distance of ball flight. When in a second position, the weight assembly provides a greater mass moment of inertia, which effectively enlarges the sweet spot and produces a more forgiving club for off-center hits.

Abstract: The invention provides a golf club head that includes a weight adjustment system inside of the club head. Preferably, when the club is played, no part of the adjustment system is directly accessible or exposed to an exterior of the club. The club head may include a panel that opens or is removable, or the club head may be disassembled to provide access to the internal weight adjustment system. A weight adjustment system generally includes at least one mechanism by which a mass distribution of the golf club head can be changed.

Abstract: The invention generally relates to golf clubs with adjustable mass properties. In certain aspects, the invention provides methods and mechanisms for adjusting a club head center of gravity in a vertical direction. Changing a center of gravity in the vertical direction can be done without substantially changing the center of a gravity in other directions.

Abstract: The invention relates to golf clubs, more particularly to mechanisms for fastening accessories to clubs. The invention provides a golf club configured to house an electronic device such as an RFID tag within a recess within the grip, thereby protecting the device from the stress, shock, and exposure that arises when a golf club is used.

Abstract: The invention relates to golf clubs, more particularly to mechanisms for fastening accessories to clubs. The invention provides a golf club configured to house an electronic device such as an RFID tag within a recess within the grip, thereby protecting the device from the stress, shock, and exposure that arises when a golf club is used.

Abstract: The invention provides a golf club head with a fully removable component that can withstand the stress of repeated hits. When assembled, the removable component is held in place by a fastening mechanism that includes structural elements that distribute the holding force across the component and tend to equalize the forces around the periphery where the component meets the body. The fastening mechanism may include a post that reaches across the open space within the hollow club head, pulling the removable component towards an opposed main club head body. Since a golf club of the present invention can be opened, it may include a mechanism on the inside for use by a golfer, such as an electronic device or an adjustment mechanism. The golf club may include a weight adjustment system that allows the club to be custom-fitted to a golfer.

Abstract: The invention generally relates to releasable components for use on golf club heads. In certain aspects, the invention provides a releasable component, including, but not limited to, a face insert, damping insert, discrete weight insert, crown panel, sole panel, heel or toe panel, skirt panel, and the like that may be interchangeable so as to provide customization of the golf club to suit the player's needs. In some embodiments, the releasable component includes an attachment feature configured to releasably engage a corresponding attachment feature on the club head body by way of friction fit. In some embodiments, the releasable component includes a tool interface configured to releasably engage a tool to allow improve the process of attaching or removing the component to or from a golf club head.

Abstract: The invention provides a golf club head that uses a light-weight material for part of the body and a strong material for a face-to-sole transition to provide a durable face with a high coefficient of restitution. The club head may have a first body part and a second body part. Material of the first body part extends down from a face member, bends around a face-sole transition, and continues into a sole return member to provide at least a portion of a ball-striking face and a sole surface. The first body part also provides a hosel. The second body part provides a significant proportion of the volume of the club head (e.g., at least about a third or even a majority). The low-density of the second body part allows for inclusion of one or more high-density third body parts to optimize mass distribution.

Abstract: The invention generally relates to golf clubs with adjustable mass properties. In certain aspects, the invention provides methods and mechanisms for adjusting a club head center of gravity and/or moment of inertia by way of an adjustable weight assembly positionable along the sole of the club head body. When in a first position, the weight assembly provides a lower center of gravity so as to increase launch angle and reduce spin rate, resulting in greater overall distance of ball flight. When in a second position, the weight assembly provides a greater mass moment of inertia, which effectively enlarges the sweet spot and produces a more forgiving club for off-center hits.

Abstract: The invention relates to golf clubs, more particularly to mechanisms for fastening accessories to clubs. The invention provides a golf club configured to house an electronic device such as an RFID tag within a recess within the grip, thereby protecting the device from the stress, shock, and exposure that arises when a golf club is used.

Abstract: The invention generally relates to golf clubs with sound tuning features. In certain aspects, the invention provides a flanged rib structure configured to provide improved sound tuning characteristics for a golf club head, particularly a hollow-bodied golf club head. In one embodiment, the rib includes a web portion extending from an internal surface of the club head body and a flange portion coupled to a top surface of the web portion. The inclusion of the flange portion to the web portion increases the overall stiffness of the rib, thereby resulting in an increase in the natural vibration frequency of the club head so as to provide a more appealing sound and/or feel upon ball impact, thereby improving the overall sound characteristics of the club head.

Abstract: The invention generally provides a removable stabilizing insert releasably couplable to an adjustable golf club head. The removable stabilizing insert is configured to be releasably coupled to mounting portion on a sole of the club head and to further provide a region for surface contact such that, when a club is given different settings, if the club is held at address resting on a surface, the club naturally comes to a rest position in which it exhibits substantially the same face angle in any setting. Accordingly, the removable stabilizing insert is configured to optimize performance of the club head by balancing and maintaining the club head.

Abstract: The invention generally relates to golf clubs with adjustable mass properties. In certain aspects, the invention provides methods and mechanisms for adjusting a club head center of gravity and/or moment of inertia by way of an adjustable weight assembly positionable along the sole of the club head body. When in a first position, the weight assembly provides a lower center of gravity so as to increase launch angle and reduce spin rate, resulting in greater overall distance of ball flight. When in a second position, the weight assembly provides a greater mass moment of inertia, which effectively enlarges the sweet spot and produces a more forgiving club for off-center hits.

Abstract: The invention relates to golf clubs, more particularly to mechanisms for fastening accessories to clubs. The invention provides a golf club configured to house an electronic device such as an RFID tag within a recess within the grip, thereby protecting the device from the stress, shock, and exposure that arises when a golf club is used.

Abstract: A releasable connection system for assembling a shaft and a club head, e.g., a golf club shaft and a golf club head. The connection system provides interchangeability between a shaft and a club head and allows the head to be adjusted with respect to the shaft. The mating structures between the shaft and the club head may be indexed for reproducible placement. In an embodiment, the connection system also includes retaining structures that maintain the connection fastener position when the head and shaft are separated.

Abstract: The invention generally relates to golf clubs with adjustable mass properties. In certain aspects, the invention provides methods and mechanisms for adjusting a club head center of gravity and/or moment of inertia by way of an adjustable weight assembly positionable along the sole of the club head body. When in a first position, the weight assembly provides a lower center of gravity so as to increase launch angle and reduce spin rate, resulting in greater overall distance of ball flight. When in a second position, the weight assembly provides a greater mass moment of inertia, which effectively enlarges the sweet spot and produces a more forgiving club for off-center hits.

Abstract: The invention generally relates to golf clubs with adjustable mass properties. In certain aspects, the invention provides methods and mechanisms for adjusting a club head center of gravity and/or moment of inertia by way of an adjustable weight assembly positionable along the sole of the club head body. When in a first position, the weight assembly provides a lower center of gravity so as to increase launch angle and reduce spin rate, resulting in greater overall distance of ball flight. When in a second position, the weight assembly provides a greater mass moment of inertia, which effectively enlarges the sweet spot and produces a more forgiving club for off-center hits.

Abstract: The invention provides a golf club head with an opening covered from within by a lightweight cap. The opening can be part of, e.g., a weight track. The club head includes a crown, sole, face, and hosel cooperating to define a hollow club head body comprising at least a first material. The club head has an opening through the hollow body. Part of an edge around the opening is provided by a first material and a cap member of a second material less dense than the first material is mounted e.g., by an adhesive to an inside surface of the hollow body and enclosing the opening. The described construction is easier to mold or cast that other forms featuring undercuts and does not unduly interfere with a club head center of gravity.