Abstract: A hollow wood-type golf club head with improved directional stability having, in head periphery region Ao including head contour line OL defined by crown portion 4 when viewed from above as a plane view of the head in the standard state, thick wall portion 9 extending along the contour line and expanding toward the hollow portion side to have an increased thickness, wherein the thick wall portion 9 comprises crown thick wall portion 9c which forms a part of crown portion 4 and has a thickness of 1.2 to 2.0 mm, and side thick wall portion 9s which is continuous with the crown thick wall portion 9c and forms a part of side portion 6 and has a thickness of 1.2 to 3.0 mm, and wherein the thick wall portion 9 has a width along the head outer surface of 6 to 16 mm in a vertical section passing through the head center of gravity G in the standard state.

Abstract: An improved golf ball driver has a first weight positioned within the clubhead of the driver, and a first means for adjusting the first weight in a generally vertical direction within the clubhead, that is, from top to bottom thereof. The improved driver also has a second weight positioned within the clubhead, and a second means for adjusting the second weight in a generally horizontal direction within the clubhead, that is from the heel to the toe thereof. Adjusting the weights allows a golfer to eliminate natural swing problems and/or to make a desired change in the flight pattern of a golf ball when it is struck by the driver.

Abstract: A golf club head includes a golf club head body and a striking plate connected thereto. The striking plate includes a first plate, a second plate and elastically deformable spaces. The first plate has a front surface to provide a striking surface, and a rear surface to provide a first connecting surface. The second plate has a front surface to provide a second connecting surface, and a rear surface. The first connecting surface of the first plate is attached to the second connecting surface of the second plate to form the striking plate which is connected to a front portion of the golf club head body. The elastically deformable spaces are formed between the first connecting surface of the first plate and the second connecting surface of the second plate.

Abstract: A weight-adjustable golf club head includes a rear lightweight covering and a golf club head body combined therewith. The rear lightweight covering has a rear crown portion and a rear wall portion extended therefrom. The golf club head body is combined with the rear lightweight covering which is designed to have a striking face, a front crown portion and a sole portion. The rear lightweight covering is made from a low specific gravity metal, and is designed to have a thickness less than 0.6 mm. The rear lightweight covering has an inner surface formed with a plurality of reinforcing ribs.

Abstract: A golf club head includes a hollow head body having a front striking member, an upper shell portion extending rearwardly from the front striking member, and a lower shell portion extending rearwardly from the front striking member and connected to the upper shell portion. One of the upper and lower shell portions is made of plastic, and the other one of the upper and lower shell portions is made of metal. The plastic shell portion has an inner surface, and reinforcing ribs projecting from the inner surface. The front striking member has a rear inner surface free of the reinforcing ribs projecting therefrom. By virtue of the reinforcing ribs on the plastic shell portion, the distance of the center of gravity of the hollow head body from the front striking member can be increased.

Abstract: A golf club head including a body and a striking plate is provided. The body has an opening. The striking plate is disposed at the opening. The striking plate integrally formed has a striking surface exposed to the outside, a non-striking surface opposite to the striking surface, and multiple ribs spread on the non-striking surface. The thickness of the striking plate is between 1.5-4 mm. The thickness of each rib is between 0.1-3.5 mm. The ribs intersect in the region of which the center of a circle is the geometric center of the non-striking surface and of which the diameter is 20 mm.

Abstract: A golf club head with a front wall, a rear wall and a reinforced crown includes ribs in the crown that are spaced more closely together near the front wall than near the rear wall. Preferably, the ribs radiate from a point in space located forward of the front wall. This arrangement of ribs significantly increases the fundamental structural frequency of the club head and significantly reduces the peak stress in the crown of the club head when compared with ribs extending perpendicular to the front wall and parallel to each other.

Abstract: Golf club heads include: (a) a club head body having a ball striking face and defining a rear cavity; (b) a fluid-filled bladder in the cavity; and (c) a retaining member holding the fluid-filled bladder in the cavity. Other club heads include: (a) a club head body having a ball striking face and defining a rear cavity; and (b) an insert member in the rear cavity, wherein the insert member interior includes one or more chambers facing the rear surface of the ball striking face. The chamber(s) may cover at least 30% of a total surface area of the interior surface of the insert member and/or at least 30% of a total interior major surface area of the rear cavity. Golf clubs including these club heads and methods of making such golf clubs and golf club heads also are described.

Abstract: A golf club head includes a head body having a front opening, and a single-piece striking plate member covering the front opening and having a striking face with a striking zone, and a back face formed with an annular reinforcing rib behind the striking zone and corresponding in position to the striking zone, a central boss formed concentrically within the annular reinforcing rib, and a plurality of angularly spaced-apart diametral reinforcing ribs extending diametrically through the central boss and the annular reinforcing rib. The annular reinforcing rib and the diametral reinforcing ribs cooperate to define a plurality of receiving grooves. A plurality of vibration-absorbing elements are disposed respectively in the receiving grooves.

Abstract: A shock-absorbing golf club head has a head body, an inner cap, a faceplate and a shock-absorbing core. The head body has an open front, an air cavity and a core cavity. The core cavity has a cavity shoulder. The inner cap is mounted securely on the cavity shoulder of the core cavity. The faceplate is mounted in the open front of the head body and is separated from the inner cap. The shock-absorbing golf club head effectively absorbs shock and generates a sound when striking a golfball.

Abstract: A hollow golf club head comprises: a face portion whose front face defines a club face for hitting a ball; a crown portion intersecting the club face at the upper edge thereof; and a sole portion intersecting the club face at the lower edge thereof, wherein at least one of the sole portion and the crown portion is provided along the front edge thereof with a face-backing zone in which the rigidity is gradually increased from its toe-side end and heel-side end toward the center thereof.

Abstract: A hollow golf club head includes a sole, a crown, a skirt, and a striking face. The golf club includes a junction interconnecting the sole, crown and skirt to the striking face, the junction including at least one stiffening member.

Abstract: To provide a golf club head in which a sole portion has a high rigidity. A weight material is mounted near a central part of the sole portion in the fore-to-aft direction, and a rib extends in the toe-to-heel direction. Since the sole portion has high rigidity in the toe-to-heel direction, there is less deformation of the head in the toe-to-heel direction when hitting the ball, thereby suppressing the vibration of the sole portion. An elastic body is filled in a recess portion and closely contacted with the weight material, whereby the vibration of the sole portion is absorbed by the elastic body.

Abstract: A golf club head enables the initial velocity of a ball to be increased and enables the carry to be lengthened. In some example structures, the golf club includes a face plate formed from metal and club head body (e.g., a crown and sole) formed from fiber reinforced plastic. A weighted body is provided inside the rearmost portion of the golf club head and a low rigidity portion whose width becomes gradually narrower as it approaches the rearmost portion is provided in the crown extending from the vicinity of the face plate to the rearmost portion.

Abstract: A golf club head (20) having optimized inertial properties and center of gravity is disclosed. The golf club head (20) preferably has a volume between 300 cubic centimeters and 500 cubic centimeters. The golf club head (20) has a center of gravity located less than 1.7 inches from an exterior surface of a front wall (30). The positioning of the center of gravity of the golf club head (20) and the optimized inertial properties provide the golf club with greater ball spin robustness and better performance.

Abstract: A golf club head includes a striking plate, a golf club head body and a plurality of annular flexible portions. In assembling, the striking plate mechanically connects to a front side of the golf club head body. The golf club head body forms a crown portion, a sole portion, a toe portion, a heel portion and a side portion to constitute a body member. The annular flexible portions are provided on an inner surface of the golf club head body. Thereby, the annular flexible portions can increase an elastic deformation of the golf club head body.

Abstract: A golf club head with a variable coefficient of restitution is disclosed and claimed. The club head includes a bias member that contacts and exerts a force against the interior surface of the face. The force exerted against the interior of the face lessens the face flexibility, and decreases the club head coefficient of restitution. The bias member can be adjusted from outside the club head, allowing the manufacturer to precisely adjust the club head coefficient of restitution.

Abstract: An golf club head is provided, having enhanced sound and feel characteristics. The club head has a hollow main body including a ball-striking face, a sole, a crown, a hosel, and a side portion extending rearwardly from the face. The body further includes a heel region adjacent to the hosel and a toe region opposing the heel region, and it defines a volume of at least 100 cc. The club head further includes a stiffening member disposed within the body and attached to both the sole and the crown. The member is spaced apart from the striking face and disposed within the body in a region having a first zone extending less than half the distance from the heel region to the toe region and a second zone extending less than half the distance from a rearmost point, thereby forming a local stiffness zone in the body to influence vibration modes and acoustic properties of the club head in a prescribed manner.

Abstract: A golf club head containing a face portion having a front face defining a club face for hitting a ball and a hollow portion provided behind the face portion, wherein the frequency F(fix) of a local minimum value of the first-order vibration mode in a frequency response function of the club head obtained by vibrating an input point on the club face and measuring the response at an output point on the club face is in a range of from 200 to 1400 Hz; and the frequency F(free) of the smallest local minimum value of a frequency response function of the club head obtained by hitting the input point and measuring the response at the output point is in a range of from 5000 to 9000 Hz.

Abstract: A hitting face of a golf club head having improved flexural stiffness properties. In one embodiment, the hitting face is made from multiple materials. The main portion of the hitting face is a plate-like face made from a first material having a first density. A dense insert made from a second material having a second density that is greater than the first density is attached directly or indirectly to the plate-like face at or near the geometric center thereof. The dense insert increases the flexural stiffness of in a central zone of the hitting face so that a golf club head that has a larger zone of substantially uniform high initial ball speed. In another embodiment, the hitting face includes an insert that includes main plate and at least one wing extending therefrom. The insert is welded to the golf club head so that the main plate does not deflect separately from the remainder of the hitting face. The geometry of the insert controls the stiffness in the axial directions.

Abstract: A golf club head comprises a sole, a crown, and a face plate. A secondary plate attaches to a rear side of the face plate.

Abstract: A golf club head includes a body and at least one transparent cover. The body includes a striking face for striking golf balls and a hosel for coupling with a shaft. The body includes a crown in which at least one opening is defined. A perimeter delimiting the opening includes a stepped portion. The transparent cover is securely mounted to the opening of the crown. The transparent cover is made of a transparent material having a specific gravity smaller than 1.5 g/cm3 for reducing a weight of the crown of the golf club head and for shifting a center of gravity of the golf club head downward and rearward.

Abstract: A golf club head having selectively oriented zones of relatively high flexural stiffness is disclosed. The hitting face is configured and dimensioned so that it includes an inner zone and a concentric intermediate zone. The inner zone has relatively high flexural stiffness and the intermediate zone has relatively lower flexural stiffness. The inner zone may have an elliptical shape or a substantially parallelogram shape. Preferably, the inner zone has a shape that comprises a major axis and a minor axis and the major axis aligns substantially in the direction of high heel to low toe. This arrangement of inner and intermediate zones creates a gradient of flexural stiffness in the direction of high toe to low heel and produces a desirable manipulation COR in that direction.

Abstract: The present invention relates to a set of golf club irons in which some of the club heads have a hollow space, and some of the club heads do not have a hollow space. The hollow space is preferably defined by a lower portion of the front face, a portion of the sole, and a rear wall. The presence of the hollow space moves the club head center of gravity back (away from the face) and down (toward the sole), making it easier to get a golf ball airborne. The volumes of the hollow spaces generally transition or get progressively smaller with an increase in the club loft angle, thus altering the center of gravity location and moments of inertia by different amounts for different clubs. The hollow spaces may be empty or filled, in whole or part.

Abstract: A golf club head comprises a front striking plate that in turn comprises a front striking surface, a rear surface, and a first boss generally centrally located on and attached to the rear surface. A rear body section is fixedly coupled to the front striking plate. A longitudinal member is adjustably coupled to the rear body section and has a first end configured for pivotal movement in engagement with the first boss. The longitudinal member applies a force of compression onto the rear surface of the striking plate.

Abstract: A golf club head has a body having a top, a sole, a toe end, a heel end, and a forward wall. The forward wall defines a front opening about which a face support is disposed. The face support receives a face plate, thereby enclosing the front opening of the body. The face support includes portions proximate to the top, the toe end, and the heel end, each portion having a peripheral member extending rearward from the forward wall and a rear member extending inward from the peripheral member, with respect to the front opening. The face support can be combined with a preferred face construction and weight elements to optimize club head performance to help a golfer achieve greater distance and control.

Abstract: Improved perimeter weighted golf clubs are disclosed. The perimeter weighted golf clubs of the present invention are provided with improved structures for distributing the weight at the perimeter of the club head. In one embodiment, the club is an iron-type golf club having a club head that includes a weighted perimeter portion and a tubular frame that is located outboard of and behind at least a portion of the hitting surface.

Abstract: A golf club head includes a body and at least one light cover. The body includes a striking face for striking golf balls and a crown. At least one recessed portion is defined in the crown and includes a bonding face. The bonding face includes a plurality of regularly arranged holes spaced by a plurality of resilient ribs. The light cover is securely mounted to the recessed portion. The light cover and the holes reduce a weight of the crown of the golf club head and improve a rearward resilient deforming capacity of the striking face. Further, the resilient ribs assure strength of the recessed portion.

Abstract: A golf club head includes: a head body including a crown portion having a plurality of openings, a face portion, a toe portion, a heel portion and a sole portion; a crown part mounted to the head body so as to close the openings, and a support portion provided between the openings for supporting the crown part. The support portion is X-shaped, for example.

Abstract: A wood-type golf club head (40) having a major body (50), a striking plate insert (55) and a minor body (60) is disclosed herein. The major body (50) is composed of a metal material and has a front wall section (72), a return section (74), a sole section (76), a ribbon section (78) and a ledge portion (80). The minor body (50) is preferably composed of a low density material and has a crown section (62) and a ribbon section (64). The striking plate insert (55) is composed of a metal material. The minor body (60) is preferably attached by a liquid adhesive to the ledge section (80) of the major body (60). At least one stiffening member (122) disposed on the interior surface of the sole section (76) of the major body (50) increases the sound of the golf club head (40) during impact with a golf ball.

Abstract: A golf club head is provided having a substantially increased sweet spot. A preferred embodiment includes a striking plate, the striking plate having a striking surface, a rear surface opposed to the striking surface and defining a thickness therebetween, and a periphery. The periphery has a first edge, a second edge, a third edge, and a fourth edge. A balance point is disposed in a central region of the striking surface, a first thickness profile extending between the balance point and the first edge, a second thickness profile extending between the balance point and the second edge, a third thickness profile extending between the balance point and the third edge, and a fourth thickness profile extending between the balance point and the fourth edge.

Abstract: An golf club head is provided, having enhanced sound and feel characteristics. The club head has a hollow main body including a ball-striking face, a sole, a crown, a hosel, and a side portion extending rearwardly from the face. The body further includes a heel region adjacent to the hosel and a toe region opposing the heel region, and it defines a volume of at least 100 cc. The club head further includes a stiffening member disposed within the body and attached to both the sole and the crown. The member is spaced apart from the striking face and disposed within the body in a region having a first zone extending less than half the distance from the heel region to the toe region and a second zone extending less than half the distance from a rearmost point, thereby forming a local stiffness zone in the body to influence vibration modes and acoustic properties of the club head in a prescribed manner.

Abstract: A golf club head includes a housing and a reinforced elastic supporting member. The housing has a front portion on which a face is disposed, a sole portion, a rear portion, a crown portion, a toe portion, a heel portion, a neck, and a chamber inside. The reinforced elastic supporting member has an end bonded to the sole portion or the rear portion of the housing, the other end bonded to the front portion or the crown portion of the housing, and a middle portion suspended in the chamber of the housing.

Abstract: A golf club head having selectively oriented zones of relatively high flexural stiffness is disclosed. The hitting face is configured and dimensioned so that it includes an inner zone and a concentric intermediate zone. The inner zone has relatively high flexural stiffness and the intermediate zone has relatively lower flexural stiffness. The inner zone may have an elliptical shape or a substantially parallelogram shape. Preferably, the inner zone has a shape that comprises a major axis and a minor axis and the major axis aligns substantially in the direction of high heel to low toe. This arrangement of inner and intermediate zones creates a gradient of flexural stiffness in the direction of high toe to low heel and produces a desirable manipulation COR in that direction. This area of high coefficient of restitution advantageously coincides with the ball impact pattern that golfers typically make on the hitting face.

Abstract: A golf club (40) having a club head (42) with a face component (60) and an aft-body (61) is disclosed herein. The face component (60) has a striking plate portion (72) and a return portion (74). The aft-body (61) is composed of a crown portion (62), a sole portion (64) and optionally a ribbon section (90). The face component (60) is composed of a metal material, and the aft-body (61) is composed of a metal material selected from the group consisting of magnesium alloys, aluminum alloys, magnesium and aluminum. The striking plate portion (72) preferably has an aspect ratio less than 1.7. The striking plate portion (72) preferably has concentric regions of thickness with the thickness portion in the center (102). The club head (42) has a volume in the range of 290 cubic centimeters to 600 cubic centimeters, a weight in the range of 165 grams to 300 grams, and a striking plate portion (72) surface area in the range of 4.00 square inches to 7.50 square inches.

Abstract: A golf club head and manufacturing method. The method includes the steps of: selectively forming through holes on a surface of a golf club head; preparing carbon-fiber plates which are made of prepared carbon-fiber fabrics; providing a cushion channel between an outer periphery of the carbon-fiber plate and an inner periphery of the through hole while each of the carbon-fiber plate is combined with the associated through hole of the golf club head; filling the cushion channel with a filler; and finishing the golf club head to produce an end product.

Abstract: A golf club head has a hollow body with a front, striking face, a rear face, an upper face, a heel and a toe, and an open lower end, the body having an internal cavity. At least one filler member of solid cork or synthetic cork material cut to match the shape and dimensions of at least part of the cavity is positioned in the cavity, and a sole plate is secured over the open lower end of the body.

Abstract: A metal wood golf club head having a metallic assembly including an opening in at least a top plate and a composite cover bonded to the metallic assembly to cover the opening.

Abstract: A golf club head includes a hollow body with a heel, a toe, a top, a bottom, a strike plate and a rear portion. A recess is defined at the bottom of the body and extends to the rear portion of the body. A strip is integrated with the body covering the recess. A tab is formed at the rear portion of the body, and has an inlet defined through the tab and in communication with the recess. Vibration-absorbing material is injected into the recess through the inlet. A sealing element is engaged in the inlet to enclose the recess.

Abstract: A golf club head is formed by integrally welding a face portion and a back portion with each other. The face portion has a circumferential edge portion in its back surface. The circumferential edge portion is made of a flat surface all over its circumference. In the rear surface of the face portion, the part other than the circumferential edge portion is formed as a recess portion. In the bottom surface of the recess portion, a first bottom surface which is the deepest, a second bottom surface which is the second deepest, a third bottom surface which is the third deepest, and a fourth bottom surface which is the shallowest are formed in descending order. Three ribs are provided vertically to extend through the recess portion.

Abstract: An improved line of golf clubs tailored to the golfer. The face wall firstly is designed so that the face wall modulus of elasticity increases from a low modulus for the low swing speed range to progressively higher modula for the higher swing speed ranges. Face modulus can be altered by a variety of techniques including face wall thinning, material selection and heat treatment or a combination thereof. In each of the swing speed range clubs, the face has a first modulus of elasticity determined by the face itself and after the face deflects to a predetermined value, the face modulus is significantly increased by a secondary wall parallel to and closely spaced behind the face wall.

Abstract: A golf club head has a body with a front, striking face, a rear face, an upper face and a lower face. A lightweight sole plate of glass fiber reinforced plastic material is secured across the lower face of the body.

Abstract: A manufacturing method for a golf club head. The method includes the steps of: casting a cast body provided with a recession thereon; cutting the cast body to form with at least one cut opening in the recession on the golf club head; adhering a carbon-fiber plate to the recession to seal the cut opening; defining a buffer groove between the carbon-fiber plate and the cast body; and filling with an elastic material into the buffer groove; processing the cast body to an end product.

Abstract: A head (5) comprises a body (9), a face (11), a neck (13) and a crown (15). The crown (15) includes an outer plate (21) and an inner plate (23). The outer plate (21) and the inner plate (23) are opposed to each other with a gap provided therebetween. The outer plate (21) and the inner plate (23) are formed of a titanium alloy. The inner plate (23) has a projection (25). The upper end of the projection (25) abuts on the lower surface of the outer plate (21). The projection (25) and the outer plate (21) are bonded to each other by a spot welding method. The outer plate (21) and the inner plate (23) have thicknesses of 0.1 mm to 0.6 mm, respectively. The head (5) has a volume of 300 cm3 or more. A portion between the outer plate (21) and the inner plate (23) maybe filled with a synthetic resin.

Abstract: A golf club head has a hollow body with a front, striking face, a rear face, an upper face, a heel and a toe, and an open lower end, the body having an internal cavity. At least one filler member of solid cork or synthetic cork material cut to match the shape and dimensions of at least part of the cavity is positioned in the cavity, and a sole plate is secured over the open lower end of the body.

Abstract: A manufacturing method for a golf club head comprises steps of: forming a plurality of through holes and annular recessed flanges thereof on a crown plate, a sole plate and a side plate of a main body blank; preparing a plurality of carbon-fiber plates by carbon-fiber fabrics; inserting a plurality of carbon-fiber reinforcing members and an air-inflating bag into the main body blank; adhering the carbon-fiber plates to the corresponding annular recessed flanges; inserting the main body blank into a die assembly and then injecting air into the air-inflating bag to thereby support the carbon-fiber plates and the reinforcing members; drawing out the flat air-inflating bag and precise processing the finished main body to accomplish an end product.

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 golf club head comprises a hollow body having a cavity, a plurality of rib-like walls provided on the inner surface of the hollow body so as to extend backward from a position near the face portion, and a sound bar disposed behind the face portion so as to extend along the back face of the face portion. A method of making a golf club head comprises making a wax model of the hollow main body having an opening, wherein in order to prevent deformation of the wax model during making a casting mold, the wax model is provided with a brace which extends across the opening and protruding walls which are disposed on the inner surface of the wax model and extend backwards from the opening.

Abstract: A golf club head has a face plate of high strength and high resilience and which provides excellent directional stability of the ball trajectory. The golf club head comprises a thick-walled portion 3 at the center of the face plate 2, and at least four narrow ribs 4a and 4b. Each of the ribs is formed with a thickness not substantially exceeding the thickness of the thick-walled portion, and extends radially from the thick-walled portion toward the perimeter of the face plate. Thin-walled portions 5 are formed between the thick-walled portion and the narrow ribs.

Abstract: A wood-type golf club having an enlarged club head in the range of 250 to 300 cm.3 constructed of a material lighter than steel to maintain the total club head weight within normal limits including the weight of 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.