Abstract: A golf club head includes a striking face, and a body coupled to the striking face. The body includes a crown, a sole disposed in generally opposed relation to the crown, and a back extending away from the striking face. The striking face and body collectively define a hollow interior chamber. A weight is disposed entirely within the interior chamber. An adjustment mechanism is coupled to the body and the weight to enable external adjustment of the weight along three axes.

Abstract: A golf club head having elevated internal weighting that improves ball speed, reduces backspin, and increases launch angle is disclosed herein. In particular, the golf club head comprises a hollow body with a face, sole, and elevated weight bar, which is disposed inside the body and is fixed to heel and toe sides of the body, preferably with mechanical fasteners such as screws or bolts. The weight bar bridges a central portion of the sole, and a central section of the weight bar, which preferably comprises at least 50% of the overall mass of the weight bar, extends towards the face without actually making contact with the face. The sole also includes at least one slot extending perpendicular to the face and underneath the central section of the weight bar, the slot having a front-to-back length that is greater than a maximum front-to-back length of the weight bar.

Abstract: Embodiments of golf clubs and methods to manufacture golf clubs are generally described herein. In one example, a golf club may include a golf club head having an interior cavity and a shaft attached to the golf club head. At least a portion of the shaft may be filled with an elastic polymer material, and the interior cavity may be at least partially filled with an elastic polymer material. Other examples and embodiments may be described and claimed.

Abstract: A golf club having a hollow golf club head which is filled with a gas under pressure. The interior surface of the golf club head is coated with a solidified layer of plastic material. The pressurized gas permits the use of thinner face plates by compensating for forces generated when the face plate strikes a golf ball. The plastic layer is preferably applied through the process of rotational molding using a thermoplastic material.

Abstract: The calibration of a backlash impulse device in a sport implement (20) is effected by firstly measuring the natural frequency of the striking surface (26) of the implement; determining from the measured natural frequency, a time of occurrence *T* and a duration of a period of elastic recovery *R? of the striking surface (26) in a first vibration cycle *P* following an impact on the striking surface (26). The method also comprises the step of adjusting a distance of travel ‘D’ of the movable mass (32) inside the backlash impulse device during a strike of a ball with the sport implement (20), such that an impulse (62) is generated on the striking surface (26) by this movable mass (32) during the strike, at the same time as the occurrence of the period of elastic recovery ‘R’ of the striking surface, in the first vibration cycle ‘P’ following the strike.

Abstract: A ball striking device, such as a golf club head, has a head that includes a face configured for striking a ball and a body connected to the face, the body being adapted for connection of a shaft thereto. The head may include one or more stiffening elements or other structures contacting an inner surface of the face, to provide locally increased stiffness to particular areas of the face. The stiffening element includes a chamber adapted to contain a viscous substance. The viscous substance can be selected and inserted into the chamber to create regions of increased stiffness in desired locations, leaving other regions of the face to have increased flexibility as compared to the stiffened regions.

Abstract: A golf club head includes a body, a striking plate engaged with the body and including a front side for striking a golf ball, and at least one gas cushion mounted in the body and behind the striking plate. The gas cushion includes a bladder defining a gas chamber. The bladder is made of an elastomeric material. The gas chamber is filled with at least a gas to provide said at least one gas cushion with compressibility.

Abstract: A golf club head includes a body having a a heel end, a toe end, and a front surface extending between the heel and toe ends. A face plate is coupled to the body by a piston assembly through a fluid. The golf club head is tuned by changing the viscosity of the fluid.

Abstract: A golf club head includes a body with a striking plate that has a front side for striking a golf ball and a rear side. A vibration-absorbing area is defined behind the striking plate. At least one gas cushion is mounted in the vibration-absorbing area and includes a bladder defining a gas chamber. The bladder is made of an elastomeric material, and the gas chamber is filled with at least one gas to provide the at least one gas cushion with compressibility. The at least one gas cushion includes an engaging section with which at least one weight member is engaged. The at least one weight member and the at least one gas cushion together adjust a center of gravity of the golf club head while absorbing residual vibrations generated as a result of striking a golf ball.

Abstract: A golf club head includes a body, a striking plate engaged with the body and including a front side for striking a golf ball, and at least one gas cushion mounted in the body and behind the striking plate. The gas cushion includes a bladder defining a gas chamber. The bladder is made of an elastomeric material. The gas chamber is filled with at least a gas to provide said at least one gas cushion with compressibility.

Abstract: A golf club head including filler material contained in a bladder disposed in a cavity that is formed in a club head body. A face plate is attached to the body and is arranged for impacting a golf ball. The bladder is located behind the face plate. When the club head strikes a golf ball on the face plate, the filler material dampens vibration which results. In one embodiment, the filler material is compressed air. In other embodiments, the filler material is a gel-like material or a granular material such as sand.

Abstract: A method for tuning a golf club head where the golf club head includes a body having a front surface, a back surface, a heel end, a toe end, a sole extending between lower portions of the heel and the toe ends, and a top rail extending between upper portions of the heel and toe ends. A face is coupled to the body through a rheological fluid. The golf club head is tuned by changing the viscosity of the rheological fluid.

Abstract: A golf club includes a golf club shaft and a golf club head connected to the golf club shaft. The golf club head includes a body having a forward surface and a striking member connected to the forward surface of the body. The striking member includes predetermined properties to deflect inwardly during initial contact with a golf ball and recover outwardly as the golf ball moves away substantially synchronized with compression and expansion of the golf ball. In some embodiments, the golf club head may include a spacer or neck connecting opposing medial portions of the body and the striking member. In other embodiments, the striking member may include a first layer and a second underlying layer disposed over the body.

Abstract: A golf club head includes a body having a front surface, a back surface, a heel end, a toe end, a sole extending between lower portions of the heel and the toe ends, and a top rail extending between upper portions of the heel and toe ends. A face is coupled to the body through a rheological fluid. The golf club head is tuned by changing the viscosity of the rheological fluid.

Abstract: The present invention provides a golf club head, in which a stable high-inertia moment is generated at the time of down swinging and impacting of a golf club, thereby reliably achieving the effect of increase in driving distance. A golf club head has a plurality of hollow chambers 3 arranged in mutually parallel relation and in mutually adjacent relation within a head 1 from a heel 6 toward a toe 7. Each hollow chamber 3 is faced with a sole-forming wall. A weight 9 composed of a granular body or liquid body is sealed in each of the hollow chambers 3, and each of the hollow chambers 3 is provided with an openable and closable inlet/outlet port 8 for charging the weight 9 into each of the hollow chambers 3.

Abstract: A golf club head includes a golf club head body, a striking plate mounted to the golf club head body, a hosel mounted to a side of the golf club head body, and a heel between the hosel and the striking plate. The heel includes a compartment for reducing a weight of the heel, thereby shifting a center of gravity of the golf club head toward a toe of the golf club head body and increasing an inertial moment of the golf club head. A filling material may be filled in the compartment for absorbing vibrations generated as a result of striking a golf ball.

Abstract: An impact absorber for a golf club head. The impact absorber for a golf club head in the invention comprises a main body and a chamber. The main body comprises a striking plate, and the chamber is adapted to receive viscous damping liquid. Thereby, the damping liquid can absorb vibration and impact energy of the main body when striking a golf ball.

Abstract: A golf club, namely a driver, includes a flowing moving part within the head such as mercury or a flowable solid in an inclined U shaped hollow passage (11). The moving part (12) remains captive at the rear of the head during the downswing on an axis defined by the direction of travel and the center of mass. A golf ball impacting the head away from this axis e.g. at the toe (17) causes the head to rotate and subsequently causing the flowing moving part (18) and hence the center of mass to move to behind the point of impact i.e. the toe, thus reducing head rotation head rotation and increasing the sweet spot.

Abstract: A golf club having an inertia capsule for supporting the strike face of the club, the inertia capsule having a novel air relief channel that is partially filled with mercury and inserted in a hollow club head to transmit ball impact to transition curves cast into the club face uniformly across the club face. A feature of the inertia capsule is that it is configured to be selectively, partially filled with mercury fluid for imparting controlled force against distribution curves cast in the club face. The inertia capsule is supported in the interior chamber by a pair of saddle members.

Abstract: A head of golf club having a hollow body with a first semi-phere integrally formed therein and a filling line integrally formed between the first semi-sphere and the bottom of the body portion, a face welded on a front end the body, a float received between the first semi-sphere and a second semi-sphere which is combined with the first semi-sphere by welding, and a casing welded on a back end of the body portion, whereby the center of mass of the golf club is self-optimizing, and the structure of the golf club head is simple and firm.

Abstract: The various embodiments of the disclosure are directed to a golf club head having adjustable loft and lie angles, wherein the loft and lie angles are hydrodynamically locked during impact of the club head with the ball.

Abstract: A golf club head having a face section with a polymer surface can provide a more efficient impact between a golf ball and the golf club head. By utilizing a polymer surface with desired material properties of stress, strain and damping levels, the face section will incur higher strain and strain rate levels than the golf ball. These lower internal stresses within the golf ball yield a more efficient impact with a golf club head.

Abstract: A device to trace and record the path of a golfer's swing comprising a golf club, a refillable reservoir tube for water or other flowable material, and a mat with blotter-like surfaces; the reservoir tube having a small diameter orifice at its lower end and having a means for refilling at its upper end; the reservoir tube being situated in a hole through the club head. A golfer's swing of the golf club will cause a thin jet of water to issue through the small diameter orifice by centrifugal and inertial forces resulting in an immediately visible trace on the mat, showing the golfer how his or her swing may be improved.

Abstract: The various embodiments of the invention are directed to a golf club head having an adjustable loft, wherein the loft angle is hydrodynamically locked during impact of the club head with the ball.

Abstract: Metal wood and wood clubs with a “swing-weight housing” using “variable swing-weights” creating a variable swingweight”, an “automatic counterbalancing” effect and “varied center of gravity” effects in addition to an increased trajectory and shot distance to the golf ball when hit. The “swing-weights” are housed in a “swing-weight housing” within the golf club cavity. On address, the club head total weight is the “swing-weights” plus the club head. On the upswing the “swing-weights” travel from the “swing-weight housing” through the hosel cavity, into the hollow shaft, coming to rest in the grip end of the hollow shaft. On the downswing the “swing-weights” reverses its travel to the club head, picking up momentum and slightly increasing club head speed.

Abstract: The invention relates to a toy, for example a Frisbee-type disc, a toy aircraft, a toy gplf club or a toy baton, provided with means for generating a stream of bubbles in use. The toy is constructed with a liquid reservoir which feeds liquid through a narrow gap to holes formed in overlying superimposed planar members. At these holes the liquid, which is a bubble-forming liquid such as a soap solution, forms a thin film until a bubble is formed under the influence of the airstreams generated around the holes as the toy moves in the air.

Abstract: A golf club, such as a conventional metal/wood driver, including a hollow club head, an elongated shaft, and a hollow hosel joined at one end thereof to the club head and connected at the opposite end to the shaft. A normally closed air valve is located inside the hollow hosel. Prior to connecting the shaft to the hosel, the normally closed air valve in the hosel is momentarily opened so that a supply of fluid (e.g. air) under pressure can be delivered to the interior of the club head through the hosel. By virtue of the foregoing, the hollow club head will be filled with air so as to become less susceptible to compression during its impact with a golf ball, whereby a harder striking force will be imparted to the golf ball to enable the golfer to drive the ball a longer distance. A pressure gauge and a pressure relief valve are carried by the hollow club head to provide the golfer with a visual indication of the fluid pressure at the interior of the head and avoid over-pressurized conditions therewithin.

Abstract: A golf putting aid is provided having an elongated body member difining an interior cavity. An attaching device, such as a clamp, is configured on the body member to removably secure the body member to the shaft of a golf putter. A weighted mass, such as a fluid, fills a portion of the interior cavity of the body member to increase the smoothness and follow through of a putt stroke.

Abstract: Various forms of golf clubs are disclosed, which include one or more inflatable bladders in the golf club head and/or golf club shaft, as well as internal and external grooving of the golf club shaft. Such golf clubs have enhanced characteristics for driving a golf ball to move in a desired trajectory. The unique structural components of the golf club provide for reinforcing, rigidifying, reducing weight and more effective control of the golf club during the swing. A higher club head speed when impacting a golf ball, more stability on off center hits, reduced vibration upon ball impact, improved sound characteristics, and improved "feel" can be achieved.

Abstract: A golf club having a head defining a recess which receives an insert. In a preferred embodiment, the insert includes a conical head and a projection extending rearwardl from the cap to the rear of the club to reinforce the face of the club and transmits impact forces to the rear of the club.

Abstract: A golf club of the invention is basically formed of a head, grip and shaft for connecting the head and grip. The head of the golf club has a sweet spot on a face surface thereof. A hollow passage extending through the grip, shaft and head is formed in the golf club, and reaches a location behind the sweet spot at the face surface of the head. Weighted materials, such as iron beads are contained in the hollow passage. When the golf club is swung to a top of back swing, the iron beads are positioned adjacent the forward end of the grip, i.e., such as the lowest end of the golf club. However, when the golf club is swung to a point of impact, the iron beads, or other materials reach the sweet spot at a high speed in receipt of a centrifugal force of the golf club to thereby increase a driving force to be applied to a ball. Thus, a flying distance of the ball can be greatly increased without changing the exterior shape or material of the face surface of the head.

Abstract: A centroid-adjustable golf club head, which can enable a user to strike ball more stably and accurately, is disclosed. The centroid-adjustable golf club head includes a head body, a sphericity, a floating ball and liquid with large specific weight. The head body has anti vibration and thermoplastic elastomer disposed therein and defines a screw hole at a top thereof. The sphericity is disposed in the anti vibration and thermoplastic elastomer of the head body. The sphericity has a charging spout formed on a top thereof and aligned with the screw hole of the head body; and a elastic wafer disposed between the head body and the sphericity. The floating ball is disposed in the sphericity. The liquid with large specific weight is fed from the charging spout to the sphericity. With this arrangement, the centroid of the club head can be adjusted to an appropriate position, depending to the relative position of the liquid and the floating ball.

Abstract: A golf club having a head defining a recess which receives an insert containing a fluid such as mercury or an oil or silicon having metallic beads suspended therein. In a preferred embodiment, the insert has a conical projection and cover which define the fluid chamber and which define an annulus on the club head face.

Abstract: The invention relates to a toy, for example a Frisbee-type disc, a toy aircraft, a toy club or a toy baton, provided with means for generating a stream of bubbles in use. The toy is constructed with a liquid reservoir which feeds liquid through a narrow gap to holes formed in overlying superimposed planar members. At these holes the liquid, which is a bubble-forming liquid such as a soap solution, forms a thin film until a bubble is formed under the influence of the airstreams generated around the holes as the toy moves in the air.