A ball striking device, such as a golf club head, has a face with a striking surface configured for striking a ball and an elongated channel extending across a portion of the sole in a heel to toe direction. The channel is recessed from adjacent surfaces of the sole. The channel may have a width defined in a front to rear direction and a depth of recession from the adjacent surfaces of the sole, wherein the channel comprises a center portion extending across a center of the sole, a heel portion extending from a heel end of the center portion toward the heel, and a toe portion extending from a toe end of the center portion toward the toe. The channel may have a wall thickness that is greater in the center portion of the channel than in at least one of the heel and toe portions.

A solution is provided to enhance motion detection and recognition of moving objects associated with various sports by embedding motion sensors into sports instruments such as tennis rackets, badminton rackets, baseball bats and golf clubs, that are swung in a three-dimensional (3D) space. A motion sensor device inserted and locked inside a sports instrument is configured to detect motions associated with movements associated with the sports instrument. The device is shaped to be inserted into a sensor housing attached to a selected location inside the sports instrument. The device includes a motion sensor for detecting motion associated with the movement of the sports instrument, a cover for protecting the motion sensor, and a locking mechanism attached to the sensor housing for locking the motion sensor inside the sensor housing.

A solution is provided to enhance motion detection and recognition of moving objects associated with various sports by embedding motion sensors into sports instruments such as tennis rackets, badminton rackets, baseball bats and golf clubs, that are swung in a three-dimensional (3D) space. A motion sensor device inserted and locked inside a sports instrument is configured to detect motions associated with movements associated with the sports instrument. The device is shaped to be inserted into a sensor housing attached to a selected location inside the sports instrument. The device includes a motion sensor for detecting motion associated with the movement of the sports instrument, a cover for protecting the motion sensor, and a locking mechanism attached to the sensor housing for locking the motion sensor inside the sensor housing.

A weight system including a weight channel formed in the body, the weight channel comprising a first wall and a second wall, an adjustable weight comprising a first member, a second member, and a fastener, the first member and the second member configured such that rotation of the fastener in a first direction forces the first member towards the second member and rotation of the fastener a second direction, opposite the first direction, forces the first member away from the second member; wherein the first member and the second member are configured to engage the weight channel when the fastener is rotated in the second direction, locking the adjustable weight in place in the weight channel; and wherein the adjustable weight is unlocked and free to slide along the channel when the fastener is rotated in the first direction.

Embodiments of golf clubs having a body, a hosel portion, and an adjustment portion, wherein the adjustment portion is configured to adjust the loft and lie of the club head are described herein. Also described herein are methods of manufacturing golf clubs having a body, a hosel portion, and an adjustment portion, wherein the adjustment portion is configured to adjust the loft and lie of the club head. Other embodiments may be described and claimed.

A variable stiffness striking implement, such as, for example, a ball bat typically used in baseball, softball, or rubber ball. The striking implement, preferably has a separate barrel and handle and includes a variable stiffness assembly which results in the user being able to adjust stiffness. This is accomplished by the user selecting a stiffness member having a desired hardness and inserting the selected stiffness around the handle and abutting the end of the barrel closest to the handle end and using a cap to hold the stiffness member in place, or, if desired by the user, the striking implement may be used without a stiffness member.

A bat for striking a ball comprises an axis, a handle, and a barrel. The handle includes a knob end, an attachment end, and a length separating the knob end from the attachment end. The barrel includes an end cap end, a barrel portion, a barrel length, and a transition section. The transition section is operatively attached to the attachment end of the handle. The bat can include a joint connecting the transition section to the attachment end while separating the barrel from the handle. Further, the bat can include an internal tubular member operatively attached to the end cap end and positioned within the barrel. A knob can be attached to the knob end of the handle while an end cap can be attached to the end cap end of the barrel. A grip can be attached to the handle adjacent the knob.

A game stick and game are disclosed. The game stick includes a shaft with a head at one end. A channel wide enough for a game ball is defined in the head. The ball is placed in the channel and when the game stick is swung, the ball rides along the channel and is released therefrom to fly through the air. The head may be adjustable to affect the way in which the ball is thrown. The game is similar to golf except that instead of hitting the ball, the ball is thrown toward a target location at the end of a fairway. When the target location is reached, the game stick may be used as a putter to push or putt the ball to sink it into a sunken cup in the ground.

A sheath for an article of athletic equipment having a shaft, which includes a cap and a rolled sheath. The cap is mounted on the free end of the athletic equipment and the sheath is unrolled onto the shaft to the desired length or the entire length of the shaft. The cap and sheath are preferably made from injection molded rubber, neoprene of other polymers that permit production in various thickness, colors and lengths. The elasticity of the material preferably gives it memory and durability. The diameter of the sheath is preferably smaller than the diameter of the shaft of the athletic equipment so that it stretches to a tight fit. After the sheath is unrolled to the desired length, excess material may be cut off, if desired.

An adjustable shaft and hosel assembly allows for dependent and independent adjustment of a golf club's face angle, loft angle, and lie angle. The adjustable shaft and hosel assembly comprises a shaft sleeve, a hosel portion, and at least two tubular adjustment pieces having non-parallel upper and lower surfaces, wherein the tubular adjustment pieces include loft and lie angle indicators that can be added together to determine overall club head loft and lie angles.