Abstract: A golf club head which comprises a face portion defining a face for hitting a golf ball, and a side portion between a crown portion and a sole portion, extending from a toe-side edge of the face portion to a heel-side edge of the face portion through the back face of the head, wherein the face portion is composed of a face plate and a face side part on one of or each of the toe side and heel side of the face plate, and the face side part is formed integrally with the side portion, but the face plate is formed separately from the face side part and welded to the face side part. The ratio of the area of the face side part to the area of the face plate is preferably set in a range of from 0.05 to 0.2.

Abstract: A golf club head (22) composed of an interior body (42) having a first density and an outer shell (40) having a second density is disclosed herein. The golf club head (22) is preferably a putter. A method (100) for forming the golf club head (22) is also disclosed herein. The interior body (42) is preferably composed of an injectable polyurethane material integrated with tungsten to have a density between 4.0 g/cc to 10 g/cc. The outer shell (40) is preferably composed of a thermoplastic material such as an ionomer blend to have a density less than 1.0 g/cc.

Abstract: A golf club which comprises a head which is less deformable by the heat in welding. Separate reinforcing members 12 and 13 are provided on inner surface of a front edge 8A of a crown shell 8. Thus, the front edge 8A side is thickened and then the upper edge 4A of the face shell 4 is joined to the front edge 8A of the crown shell 8, by welding. The front edge 8A of the crown shell 8 is formed with a plurality of projections 11 which are anchored by the upper edge 4A of the face shell 4. front edge 8A of the crown shell 8 is thickened by adding the thickness of the reinforcing members 12, 13 to the thickness of crown shell 8 itself. Thus, thermal deformation and the sinking of the front edge 8A at the time of welding can be prevented, thus enabling the upper edge 4A to be joined to the front edge 8A as designed.

Abstract: A wood golf club called a metal wood which suppresses the deformation of a head body at the time of impact, thereby effectively elastically deforming a face to thereby elongate a travelling distance of a ball. An outer shell of a head 1 is constructed of metallic shell members, thus defining a hollow interior 11 inside the head 1. A tabular reinforcing member 20 is provided nearly along a cross-sectional area of the hollow interior 11 defined in a toe-to-heel direction, a preset distance away from the face 2. Thus, the deformation of a sole 4 and a crown 5 can be suppressed, while permitting the sufficient elastic deformation of the face 2.

Abstract: A high impact golf club head with a face wall surrounded by a perimeter wall. After initial ball impact this face wall deflects and impacts a separate light weight open cellular structure that supports the face wall as it deflects and minimizes face wall failure.

Abstract: A golf club head is disclosed. The golf club head includes a body having a front face, a rear face, a top and a bottom. The club head also includes a viscoelastic member positioned within the body and in direct contact with the front face of the body. The viscoelastic member counters force applied to the front face of the body when a golf ball is struck.

Abstract: Golf clubs and golf club sets which include weights which control the effective loft angles of the club head. Weights positioned adjacent the top of the club heads between the face and bottom focus the mass of the club head to improve striking force or power imparted to a ball upon impact. Weights positioned adjacent the face of the club heads between the bottom and top create moments of inertia which effect the loft angle of the club faces when a ball is struck by the clubs. These two types of weight positions can be combined together.

Abstract: A golf club head having a force absorbing mass located behind the ball striking face and a force transmitting arcuate member connected between the mass and a rear surface of the club head. Impact forces are transmitted through the arcuate member into the force absorbing mass where they are dissipated.

Abstract: A golf club having a club head with a thin, flexible striking plate for improved energy transfer to a golf ball also has a means for limiting the deflection of the striking plate during high speed impacts with the golf ball. A brace is positioned within the interior of the golf club head a predetermined distance from the striking plate to limit the deflection of the thin, flexible striking plate.

Abstract: An apparatus allows a golfer to improve his or her swing. A striking pin is mounted on a club head using a rigid bracket. The golfer swings so as to strike a golf ball with an end surface of the striking pin. Progressively smaller striking pin end surface areas may be used. After practicing using the striking pin, a golfer removes the striking pin and continues with normal play.

Abstract: A metallic golf club head includes a face having a plurality of scoring lines formed horizontally on a front surface of the face within a sweet area thereof, and a plurality of reinforcing ridges formed on a rear surface of the face. A plurality of ridges are formed along the scoring lines. Preferably, each reinforcing ridge is positioned right behind the corresponding scoring line so as to compensate a decreased thickness of the face caused by forming the scoring line.

Abstract: A golf club head which can be reduced in its thickness with no fear of impairing the durability and strength of the club head. A face portion of the golf club head is configured such that the vertical dimension of the face portion is smaller than the horizontal dimension thereof, and the face portion is arranged so as to satisfy any of the following conditions: 1) the longitudinal direction of crystal grains of a material of the face portion is oriented in the vertical direction of the face portion; 2) the direction in which the material exhibits a large ductile amount at the time of breaking is oriented in said vertical direction; and 3) the direction in which the material exhibits a large ratio of ductility per unit length is oriented in said vertical direction.

Abstract: A method for producing a golf club head includes: preparing a plurality of face plates that complement with one another to form the golf club head; joining edges of the face plates to form a shape of the golf club head, and providing grooves which extend between the adjoining edges of the face plates and which open at an outer surface of the golf club head; and welding the adjoining edges by placing the joined face plates in a mold and by introducing a solder into the mold casting in the grooves.

Abstract: An iron golf club set comprises a plurality of iron golf clubs having respective club numbers different from each other. Sole widths of the iron golf clubs become gradually larger from No. 7 iron club toward a lower lofted iron club having the smaller loft angle than that of the No. 7 iron club and a higher lofted iron club having the larger loft angle than that of the No. 7 iron club. The sole widths of No. 5 iron club and iron golf clubs having the smaller loft angle than that of the No. 5 iron club are larger than the sole width of a sand wedge.

Abstract: A golf club head is formed with a unitary, one-piece body including a top crown, sole plate, face plate and side skirt. The side skirt includes an opening, and a cap is configured to cover the opening. Preferably, the cap is connected to the side skirt by a snap fit or interference fit. The interior portion of the golf club head preferably includes a reinforcement structure which supports the face plate. Desirably, the reinforcement structure includes three vertical ribs which are connected to the top crown, face plate and sole plate to form part of the one-piece body.

Abstract: In one embodiment, a golf club head which has a club head body, a means to attach the club head body to a shaft, a striking face wall to address a ball during a golf club stroke and a bottom surface adapted to pass adjacent the ground during the golf club stroke, includes a vibration damping member of shock-absorptive material disposed within the club head body and extending in a plane outside the plane containing the striking face wall. The vibration damping member is preferably disposed either substantially perpendicular to the striking face wall or substantially parallel to the bottom surface. The damping member preferably abuts the striking face wall without penetrating therethrough.

Abstract: A golf club head has a perimeter formed by bending a tube into a desired perimeter shape, and securing a member over at least part of the loop to at least cover the loop opening and form the striking face. At least one plug of weighting material fills a portion of the tube at a predetermined location on the loop to form a weighted portion. Successive plugs of the weighting material and a lighter weight material may completely fill the tubular loop. Each plug is inserted while the material is in a flowable condition and the loop is held in a suitable orientation based on the location of the plug. The material is allowed to harden before adding the next plug.

Abstract: A big scale (500 cc) golf club head fabrication method includes the step of preparing molds for making a top cover panel, a bottom cover panel and a face panel, the step of preparing metal alloy plate materials and then cutting the metal alloy plate materials into the desired sizes and then using the molds thus obtained to forge the metal alloy plate materials into the desired top cover panel, bottom panel and face panel respectively, and the step of welding the obtained top cover panel, bottom panel and face panel in a vacuum tank to form a golf club head and then polishing the golf club head into a finished product.

Abstract: A golf club that is preferably made from fiber-reinforced plastic composite by an injection molding process. The preferred golf club head includes a striking face for striking a golf ball, an outer periphery, a cavity formed between the outer periphery and the back of the striking face, a sole enclosing the bottom portion of said cavity, and at least one elongate power bar extending across the cavity from the striking face to the outer periphery. The sole is preferably integrally formed with the face plate and outer periphery. The cavity of the golf club head opens to the top of the club head. Each elongate power bar separates the cavity into receptacles. Inserts may be placed within the receptacles for aesthetic, aerodynamic, acoustic, and other purposes.

Abstract: A golf club head comprising toe and heel portions, a front wall defining a ball-striking face, and top and bottom walls, the bottom wall characterized as having a medial ridge, and as forming two shallow recesses, one recess between the ridge and the heel portion, and the other recess between the ridge and the toe portion, the recesses everywhere spaced rearwardly from the front wall, the one recess having an arcuate peripheral edge generally convex toward the heel portion, and the other recess having an arcuate peripheral edge generally convex toward the toe portion.

Abstract: An improved golf club head incorporating a lattice structure covered by a thin-walled body. The aerodynamically shaped golf club head has a lattice structure formed by an outer ring, curved longitudinal frame elements, and curved latitudinal frame elements. A generally flat shaped ball striking face is formed at one end of the lattice structure. The ball striking face is generally parallelogram shaped and results in a larger and more desirably oriented "sweet spot." The thin-walled body covering the lattice structure defines a cavity, and has a top, a bottom, a toe end, a heel end, and a tail end. The ball striking face extends between the top and the bottom of the thin-walled body at an angle with respect to the vertical. A hosel extends generally upwardly from the heel end of the thin-walled body. Alternative internal energy absorbing and distributing structures, in addition to the lattice structure, are also part of the invention.

Abstract: A golf club head having a heel end and toe end includes a hollow body with a top wall, a bottom wall, a side wall connecting the top and bottom walls and a front wall arranged for impacting a golf ball. The front wall of the body varies in thickness in two planes including a first plane that is disposed substantially horizontally between the top and bottom walls of the body and a second plane that is disposed substantially vertically between the heel and toe ends of the head. The body front wall has increased thickness along an axis where the two planes intersect. The increased thickness of the front wall decreases in four directions including a first direction extending from this axis toward the body top wall, a second direction extending from this axis toward the body bottom wall, a third direction extending from this axis toward the head heel end, and a fourth direction extending from this axis toward the head toe end.

Abstract: A golf club head includes a shell formed of a front striking face, sole, opposed sidewalls and a rearwall defining an interior cavity. At least one rib projects between at least two of the front striking face, the rearwall, the opposed sidewalls, and the sole. A plurality of ribs may be disposed within the interior cavity. The plurality of ribs may extend laterally between the opposed sidewalls or between the front striking face and the rearwall. The ribs may also be disposed within an interior cavity formed by a completely closed, one piece shell forming the golf club head. The ribs are integrally cast with the shell.

Abstract: A golf club having a crown of such an improved strength that it can be thin-walled. A head 1 is hollow and metallic. A number of depressions 26 are formed by forging, for example, on nearly an entire area on an outside surface of a crown 1a of the head 1. Thus, the strength of the crown 1a is improved, thus enabling it to be thin-walled. Accordingly, the head 1 can be large-sized, with its center of gravity being lowered.

Abstract: A golf club head having a plurality of pores spaced along scoring lines of a face in front of a recessed top chamber thereof, and a circular through hole at the center of a back wall thereof behind the recessed top chamber for guiding air out of the recessed top chamber when striking the ball.

Abstract: A metal-wood golf club head having a metallic acoustic adjustment member installed on the inside surface of a sole shell part of the head main body. The acoustic adjustment member is installed so as not to be in contact with the face shell part, crown shell part and peripheral wall shell part that form the head main body.

Abstract: A golf club head with an internal power shaft that extends along the target line. In a high volume club head embodiment above 250 cm..sup.3, constructed of a low modulus alloy compared to stainless steel, the power shaft has a preload, or static compression, to increase the modulus of elasticity of the head and ball striking face. This preload technique is expanded in another embodiment into a semi-customized line of golf club woods, where the club head modulus of elasticity increases with the golfer's club head speed by progressively increasing preload in the club head line. The power shaft is press-fitted into the rear of the ball striking face to reduce bonding and welding difficulties in joining the power shaft to the ball striking face. The modulus of the face wall and the power shaft is enhanced by casting or welding the sole plate of the club head along an axial extent directly to the outer surface of the power shaft thereby increasing its columnar strength.

Abstract: A wood-type golf club having an enlarged club head in the range of 250 to 300 cm..sup.3 constructed of a material lighter than steel to maintain the total club head weight within normal limits including the weight of a novel power shaft according to the present invention. The club head, without the power shaft, is approximately 175 gms. and the power shaft weighs approximately 25 gms., so the total club head weight is approximately 200 gms. and within normal limits. The power shaft, integral with the rear of the ball striking face wall at its forward end and integral or cast into the rear of the club head at its rear end, while reinforcing the ball striking face wall, increases the resonant frequency of the face wall to synchronize face wall rebound to the player's swing speed. Face wall resonant frequency is varied by changing the size and weight of the power shaft.

Abstract: A cavity backed iron-type clubhead has a striking plate which has a point of least rigidity which is generally aligned with the center of gravity of the clubhead. The striking plate is formed between the front face of the clubhead and the back wall of the cavity. The point of least rigidity of the striking plate is adjusted by a rigidifying member on the back wall of the cavity which increases the thickness of the striking plate. The back wall may also include a rearwardly extending projection which is generally aligned with the center of gravity of the clubhead.

Abstract: A golf club head of the metal wood-type is provided, wherein the sole plate of the club head includes a downwardly open recess defined by a generally centrally located dome element. Internal stiffening ribs may be provided within the club head to extend between the dome element and a selected club head side wall, preferably such as the front or ball impact face of the club head.

Abstract: An enlarged metalwood golf club head, including a hollow body and a weight pad. The hollow body includes an inner cavity surrounded by sole portion, an impact face, a heel portion, a toe portion, a rear face portion joining the heel portion to the toe portion and a crown portion joining the impact face, the toe portion, the heel portion and the rear face portion. The heel portion includes an opening for the introduction and connection of a shaft. The opening defines an axis. A weight pad is located within the cavity of the body along the sole portion so that the center of gravity of the golf club head is located beneath the center of the impact face and closer to the heel portion than the toe portion. Desirably, the metal head has a size and a shape such that the head has a high moment of inertia about the vertical axis y passing through the center of gravity so that the head has increased resistance to horizontal rotation upon off-centered strokes.

Abstract: A golf club head made of metal has a hollow construction with a pair of arcuate reinforcing ribs extending in horizontal and vertical planes with the arcuate ribs terminating at the striking plate of the golf club where a base structure of reinforcing ribs interconnect the ends of the arcuate ribs. The rib structure is molded integrally with the walls of the hollow club head and function to desirably reinforce the club head to prevent collapse or other distortion while providing a relatively large sweet spot and preventing undesired torque on the club head when a golf ball is hit at an off center location on the striking plate.

Abstract: A metal wood club head for golf and a method for producing the metal wood golf club head relating to the present invention can transmit, to his hands through the shaft, the feeling of where on the club face the user hit the ball similar to persimmon heads so that the user can make progress in playing golf, cause little trouble to his elbows because of the decreased vibration at the impact of a shot, have sperior durability and impact resiliency, and are readily suitable for mass-production on the assembly line. The club head comprises a metal outer shell having a hollow inside portion and foamed metal arranged into the hollow inside portion which are united integrally. A main member of the club head may be a foamed metal. Then it is favorable that at least the face plate of the main member is covered with metal. The surface of the main member may be covered with a divided shell member.

Abstract: A metallic golf club head that has an end portion, on which a neck part is integrally formed, and a hollow portion therein. The golf club head further has a face member, which is formed integrally with the neck part by forging, and a hollow member that is welded to a peripheral edge portion of the face member and, with the face position, composes the hollow portion. The face member is provided with a face portion, whose front surface is a face surface and whose rear surface is formed flat, and a raised portion formed like a ring in such a way as to project from a peripheral edge part of the face portion in a direction opposite to a direction to which the face surface is faced. A rear-end peripheral edge part of the raised portion is butt-welded to a front-end peripheral edge part of the hollow member.

Abstract: A golf club head having a perforated sound plate suspending inside a hollow casing thereof, the perforated sound plate being vibrated to make a sound when the golf club head strikes the ball.

Abstract: An enlarged golf club head has a front wall decreased in thickness, which is sufficient strength, easy to menufacture, and has no increase in total weight. It is a wood or iron golf club head with a plate wall made of a metal, a front side of which provides a front wall having a ball striking front face and a back face at the opposite side thereof, the back face having a plurality of ridges projecting rearwardly of the back face. The ridges extend vertically, horizontally or in both directions of the club head and are disposed at a back of at least a sweet spot of the front face.

Abstract: A golf club head includes a hitting face plate and a club neck which are integrally formed from copper. The hitting face plate has a rear face integrally formed with a plurality of insert posts projecting rearward therefrom. Each of the posts has an inner end integrally formed with the hitting face plate, and an enlarged outer end. A club head body is molded over the hitting face plate and the club neck, and is made of a metal which has a melting point lower than that of copper. The posts are embedded in the club head body. The golf club head is formed by a process which includes the steps of forming a copper blank piece which consists of the hitting face plate and the club neck, enlarging the outer ends of the posts, and molding the club head body over the copper blank piece.

Abstract: A golf club head comprising toe and heel portions, a front wall defining a ball-striking face, and top and bottom walls, the bottom wall characterized as having a medial ridge, and as forming two shallow recesses, one recess between the ridge and the heel portion, and the other recess between the ridge and the toe portion, the recesses everywhere spaced rearwardly from the front wall, the one recess having an arcuate peripheral edge generally convex toward the heel portion, and the other recess having an arcuate peripheral edge generally convex toward the toe portion.

Abstract: A golf club head which has a club head body, a means to attach the club head body to a shaft, a striking face wall to address a ball during a golf club stroke and a bottom surface adapted to pass adjacent the ground during the golf club stroke, includes a vibration damping member of shock-absorptive material disposed within said club head body and extending in a plane outside the plane containing said striking face wall. The vibration damping member is preferably disposed either substantially perpendicular to said striking face wall or substantially parallel to said bottom surface. The damping member preferably abuts the striking face wall without penetrating therethrough.

Abstract: A golf club head includes a face plate and a head body. The face plate is made of a first metal material and has a front side which serves as a hitting surface, and a rear side which is provided with a plurality of angularly spaced positioning pieces that extend radially outward from a peripheral edge of the face plate. The rear side of the face plate is further provided with a plurality of elongated reinforcing strips, each of which has a rearwardly protruding intermediate curved portion. The head body is made of a second metal material which has a melting point that is lower than that of the first metal material. The head body has a front portion with a front surface. The face plate is embedded in the front portion of the head body such that the hitting surface of the face plate is flush with the front surface of the front portion.

Abstract: In the method of forming a hollow metallic golf club head having wall structure defining a front wall, a heel, a toe, a rear wall, a sole, and a top wall, the steps that include providing a wax shell covered preformed core body, the thickness of the wax shell corresponding to the desired thickness of the wall structure, forming a ceramic shell about the wax shell; removing the wax shell by melting the wax, thereby to form an opened gap between the ceramic shell and the core body, and casting molten metal into the opened gap, thereby to form the wall structure extending about the core body and at the sole, while forming and maintaining port structure through the wall structure and spaced from the sole, and allowing the wall structure to solidify to form the head; removing the ceramic shell from the wall structure, and removing the core body from the interior of the solidified head, and via the port structure.

Abstract: In a metal golf club head, a recess portion with a closed bottom is formed in a bottom surface of a hollow shell cast of metal, and a sole plate, made of metal greater in specific gravity than the shell, is received in and secured to the recess portion in such a manner that the sole plate lies flush with that portion of the bottom surface disposed adjacent to a peripheral edge of the recess portion. The sole plate can withstand an impact produced when hitting a ball, and is prevented from becoming disengaged from the shell.

Abstract: A driver head for golf of which main body is a core member, the core member comprising a required number of small pieces of aluminum plate or small masses of foamed aluminum, the small pieces of aluminum plate or small masses of foamed aluminum being put into a mold for compression molding and welded to each other by use of an electric current.

Abstract: A new structure for a golf club head which is lighter yet with lower impact loss and featuring internal reinforcements is designed according to research results from impact mechanics. The impact capability of the golf club head can be improved by placing the reinforcement structures close to the striking face and its adjacent support. The design of the golf club head keeps the same weight as the current standard stainless steel head while lowering kinetic energy loss during the impact or reduces the weight of the club head while maintaining the same energy loss. This golf club head is formed by a combined "superplastic forming and diffusion bonding" method for fabricating a titanium alloy golf club head.

Abstract: A hollow wood-type golf club is fabricated with a thin layer of elastomeric dampening material coating the inner surface region opposite the ball impacting face and within the hollow cavity of the head shell. The layer provides vibration dampening, improving the play of the club. A low cost, simple method to fabricate the head with the layer includes dispensing a quantity of uncured elastomer in liquid form into the cavity, maintaining the head with the inner surface opposite the ball impacting face at a horizontal attitude to cause the liquid to pool over this inner surface region, and curing the elastomer with the head in this attitude until the elastomer has cured and hardened. Golf iron and putter clubs are described with a vibration dampener consisting of a thin layer of elastomer material adhered to a base cavity surface of a cavity backing the ball impacting surface. Methods for fabricating the iron and putter clubs are described.

Abstract: A hollow wood-type golf club is fabricated with a thin layer of elastomeric dampening material coating the inner hollow cavity of the head shell. The layer provides vibration dampening, improving the play of the club. The vibration dampening material can also be applied in a thickened region at a desired location within the cavity to achieve a desired weighting to affect the balance of the head. A low cost, simple method to fabricate the head with the layer includes dispensing a quantity of uncured elastomer in liquid form into the cavity, coating the inner surface, pouring off the excess material, optionally weighing the head and adding an amount of the liquid elastomer to bring the head up to a desired nominal weight, maintaining the head at an attitude to cause the excess liquid to pool at a location at which additional weight is desired, and oven curing the elastomer with the head in this attitude until the elastomer has cured and hardened.

Abstract: A composite-metal wood-style golf club head having a metal casing with at least two openings in the crown in which composite covers are disposed. The portion of the metal casing between the covers defines a bar-like stiffener that extends between the face and the back in a direction generally perpendicular to the face. The metal stiffener braces and reinforces the face against flexure during impact with the ball, while the composite covers optimize weight distribution and provide other advantages. The club head may include a composite core with a relative thick portion behind the hitting face to further reinforce the hitting face against flexure.

Abstract: A golf club head comprising a shell having toe and heel portions, a rear wall, a front wall defining a ball-striking face, and top and bottom walls, the bottom wall characterized as having a medial ridge, and as forming two dished shallow recesses, one recess between the ridge and the heel portion, and the other recess between the ridge and the toe portion, the recesses spaced rearwardly from the front wall, the one recess having an arcuate peripheral edge generally convex toward the heel portion, and the other recess having an arcuate peripheral edge generally convex toward the toe portion, the recesses being located in substantially mirror imaged positions with respect to a forwardly extending vertical plane bisecting the ridge, the head, when viewed toward the bottom wall, presents a peripheral outline which, at the toe and rear of the head, has substantial spacing from the other dished shallow recess.

Abstract: A metal wood type golf club head provided with a conically shaped metal sleeve filled with hard polyurethane material and disposed within the club head shell to extend between the club face plate and back end portion of the club head.

Abstract: A golf club head including a titanium face plate, a plurality of locating plates welded to the back side of the face plate for the positioning of the face plate in the male die section of a die, a casing molded on the face plate by pouring molten aluminum alloy in the female die section of the die, and covered over the locating plates and the back side of the face plate, wherein the face plate has a loop-like molding groove at the back side and a tapered periphery sloping outwards toward the back side for the engagement of the casing during the molding; each locating plate has a flat back section welded to the back side of the face plate, a smoothly curved springy front section for positioning in a respective locating groove on the male die section, an intermediate connecting section connected between the back section and the front section at one side, and a plurality of circular through holes at the intermediate connecting section for the passing of the molten aluminum alloy during the molding of the casing.