Abstract: An iron golf club head includes a head main body and an FRP body. The head main body includes a face portion, a first face along the face portion, second faces, and a recess behind the head portion. The second faces continue from a rear face of the face portion to the first face. The recess is defined by the first face and the second faces. The hollow FRP body is disposed in the recess, overlaps the first face and the second faces, and closes an opening portion of the recess. At least a part of crossing corner portions between the first face and the second faces has a curved face.

Abstract: The present invention resides in a golf club head having a high COR that is durable and has desirable acoustic qualities. The club head includes a body portion, a striking face and a crown forming a hollow cavity of at least 150 cc in volume. The body portion defines a front opening and an upper opening, and it includes a sole and a side section that extends rearward of the front opening. The striking plate is secured to the body portion, enclosing the front opening. While partially assembled, final weighting and/or other attachment of other members to the inner surface of the club head can be preformed, as desired. The crown is secured to the body portion, enclosing the upper opening. A surface veil may also be provided about a junction of the crown and body. The crown has a maximum thickness no greater than about 2 mm. The density of the crown is less than the density of the body portion.

Abstract: A golf club head includes a front body formed of a titanium-based metal material, an FRP body, a metallic sole plate, and a weight member. The front body has a face portion, a metal sole portion, a metal side portion (toe), a metal crown portion, a metal side portion (heel), and a hosel portion. A slight gap is formed between a front side of the sole plate and the metal sole portion. Preferably, the front body is made of a titanium alloy, while the sole plate is made of stainless steel. The height of center of gravity (mm) and the head volume V have a relationship of H?0.05V+7.5.

Abstract: A golf club head includes a front body formed of a titanium-based metal material, an FRP body, a metallic sole plate, and a weight member. The front body has a face portion, a metal sole portion, a metal side portion (toe), a metal crown portion, a metal side portion (heel), and a hosel portion. A slight gap is formed between a front side of the sole plate and the metal sole portion. Preferably, the front body is made of a titanium alloy, while the sole plate is made of stainless steel.

Abstract: A golf club head includes a front body formed of a metal material, an FRP body, a metallic sole plate, and a weight member. The front body has a face portion, a metal sole portion, a metal side portion (toe), a metal crown portion, a metal side portion (heel), and a hosel portion. A slight gap in a range of 4 mm to 12 mm is formed between a front side of the sole plate and the metal sole portion. This part is formed of the FRP body. Preferably, the metal material of the front body includes a titanium-based alloy or a zirconium-based amorphous alloy. The sole plate is made of stainless steel.

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 and a method of making a golf club head includes a framework that is applied to the rear portion of the club head. A heat shrinkable membrane is mounted to the framework, by either mechanical means or by application of a bonding agent, creating a hollow golf club wherein the membrane material at the center of the rear portion is taut and exposed. The membrane is made from a conformable heat shrinkable fabric having a high tensile strength and negligible compressive strength. The fabric comprises thin, relative flexible, long interwoven fibers such as Kevlar, canvas, sailcloth and fabrics used in the skins of airplanes.

Abstract: The invention prevents a crimple from being generated in a resin member. The invention provides a golf club head (1) including a head shell portion (M) made of a metal material and having an opening portion (O1), and a resin member (FR) made of a fiber reinforced resin arranged in the opening portion (O1), and provided with a hollow portion in an inner portion. The resin member (FR) is constituted by a molded body formed by integrally molding a laminated body of plural layers of prepregs having a magnitude covering the opening portion (O1) and having different resin percentage contents in the head shell portion in accordance with an internal pressure molding method. Further, the prepreg having the largest resin percentage content is used in an innermost layer of the laminated body closest to the hollow portion.

Abstract: The partial crown portion member comprises: the edge frame made from metal; and the shell body provided inside the edge frame and made from resin enveloping the inner edge of the edge frame. Inside the edge frame, the plural through-holes penetrating the front surface of the edge frame to the rear surface thereof are provided, while the shell body is inserted in the through-holes by casting manner. Since the front and rear surfaces of the inner edge of the edge frame, the through-holes are enveloped by casting manner, the adhesiveness thereof can be enhanced.

Abstract: A hollow golf club head is formed form a metal member with at least one opening. An FRP member made of a fiber reinforced resin is attached to the metal member to cover the opening. The metal member has at least one slit extending along at least a periphery of the opening and further includes an outer surface and an inner surface. The FRP member has a locking portion that enters into the slit from one side of the outer surface or the inner surface of the metal member and exiting from the other side so as to extend along a surface thereof.

Abstract: An iron golf club head includes a head main body and an FRP body. The head main body includes a face portion, a first face along the face portion, second faces, and a recess behind the head portion. The second faces continue from a rear face of the face portion to the first face. The recess is defined by the first face and the second faces. The hollow FRP body is disposed in the recess, overlaps the first face and the second faces, and closes an opening portion of the recess. At least a part of crossing corner portions between the first face and the second faces has a curved face.

Abstract: A golf club head comprises: a hollow main body made of at least one metal material and provided in at least one of a crown portion and a sole portion of the head with an opening; and an FRP part covering said opening and made of at least one resinous material reinforced with fibers, wherein the fibers include: longitudinal fibers oriented in a direction substantially parallel to the front-back direction of the head; and traversal fibers oriented in a direction substantially perpendicular to the front-back direction, and the longitudinal fibers are less than the traversal fibers with respect to a total weight of fibers in a unit area and/or a total of tensile elastic moduli of fibers in a unit area.

Abstract: A hollow golf club head enables to increase the bonding strength of an outer shell member made of metal and an outer shell member made of fiber reinforced plastic. The hollow golf club head comprises a hollow golf club having a head body of a hollow structure formed by bonding the metallic outer shell member and the fiber reinforced plastic outer shell member, wherein the fiber reinforced plastic outer shell member is bonded to both faces of the bonding portion of the metallic outer shell member.

Abstract: A golf head includes a hollow head body defining a front opening and having a reinforcing portion that is made from a non-metal material, a striking plate received in the front opening and secured to the head body, and a plurality of first reinforcing metal ribs embedded securely in the reinforcing portion of the head body.

Abstract: The present invention relates to a golf club head composed of a metal member made of at least one kind of metal material and a FRP member made of a fiber reinforced resin, the metal member having a first lap joint part, and the FRP member having a second lap joint part lap-jointed with the first lap joint part and a non-lap joint part, wherein the resin content of the second lap joint part is larger than the resin content of the non-lap joint part.

Abstract: The present invention intends to prevent deviation and gap from being generated in a joining section of a golf club in which a head main body 10A and a surface material 10B are integrated by joining together and provide a high quality golf club head having an improved durability and manufacturing method thereof. In the golf club head in which the head main body 10A and the surface material 10B are joined together such that they are integral, a groove 18 is provided in a joining section between the both members and joint material 19 composed of fiber reinforced resin material is embedded in that groove. Consequently, the joining strength is intensified.

Abstract: A recess portion is provided on a rear face of a head main body. A resin layer is bonded between ribs, of an innermost face. After an element assembly of the resin layer, an element assembly of the FRP body and a balloon are inserted into the recess portion, the iron golf club head is mounted in a mold, and a gas such as air is supplied into the balloon through an air opening inserted into an opening.

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 (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 non-metal material such as a composite material or a thermoplastic material. The striking plate portion (72) preferably has concentric regions of thickness with the thickness portion in the center (102).

Abstract: A golf club head has a metal base, face and tubular neck and a carbon-fiber cover. The face extends up vertically from one edge of the base. The tubular neck is integrally connected to the base and the face. The cover is made of a carbon-fiber material and is securely attached to the base and the face. Because the carbon-fiber material is lighter than metal, the area of the face is enlarged. In addition, the shock absorbing effect of the golf head club is also improved.

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 golf club head made of a fiber reinforced resin, comprising: a face hitting a ball; a crown forming an upper surface of the head; a sole forming a bottom surface of the head; a side extending between the crown and the sole from an edge on a toe side of the face to an edge on a heel side through a back face; and a hosel into which a shaft is inserted, wherein the crown has a thickness of equal to or less than 2.2 mm, and includes at least partially a high elastic part made of a fiber reinforced resin reinforced by at least one kind of fiber having a tensile elasticity modulus between 380 and 900 (GPa), and the hosel is provided with a vibration absorbent having a loss tangent between 0.7 and 1.5 at a temperature of 10° C. in the vicinity thereof.

Abstract: A golf club head and manufacturing method therefor comprises steps of: selectively forming a plurality of through holes on a surface of a golf club head; preparing a plurality of carbon-fiber plates which are made of prepared carbon-fiber fabrics; remaining 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 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 accomplish an end product.

Abstract: A composite golf club head includes a strike plate having a neck formed at an end of the strike plate. A rear portion is formed at an upper side of the strike plate and extends backwards. An inner plate, made up of multiple layers of fiber prepreg material, is adhered to an interior surface of the strike plate by a first of two adhesive sheets. A cover, made up of multiple layers of the fiber prepreg material, is adhered to the back of the rear portion by a second of the adhesive sheets. A bottom plate, made up of a metal material, is adhered to bottom portions of the strike plate and the cover by the adhesive sheets to close the head. A seat is formed inside the bottom plate, and a hole is defined through the seat. A balance member is engaged in the hole.

Abstract: The present invention provides a hollow golf club head comprising a metal striking insert and a composite body. The metal striking insert (1) is molding within the front face wall (2) of the club head body and is securely attached at the outside perimeter of the insert to the composite body and at the front corners of the composite body through the use of a sandwiched structure (7,8, &9). The sandwich structure formed at the boundaries of the striking metal insert efficiently dissipates the impact energy affected when a golf ball is hit. The structure also dampens efficiently the vibrations of the shock affected when the ball is hit on the metal striking insert. The present invention of positioning the insert inside the face wall, not extending outside the face wall, uses less metal material which is heavier than the composite material and makes a larger club head at the same total weight of the club head.

Abstract: A golf club head is constructed to include a hollow casing molded from a compound material, an L-shaped thin sheet of metal packing plate and a cover plate. The casing has a front face, a bottom face, a back face, a toe, a heel, a neck, and a top open side. The packing plate is fixedly fastened to the front face and bottom face of the casing, thereby forming a face panel and a sole for the golf club head. The cover plate is fixedly fastened to the casing and covered the top open side of the casing.

Abstract: A golf club head includes a face frame defining a frame space, a supporting wall extending from the face frame, a fiber wall extending from and cooperating with a rear peripheral edge of the face frame and a peripheral edge of the supporting wall to confine an inner space thereamong, and a face panel received in the frame space and integrally connected to an inner face of the face frame which confines the frame space.

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 an amorphous metal material, and the aft-body (61) is composed of a non-metal material such as a composite material or a thermoplastic material. 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: An insert for a golf club, wherein the insert is formed of a polyurethane composition comprising a prepolymer comprised of a polyol and a polyisocyanate, and a curing agent; and wherein the polyisocyanate is selected from the group consisting of 4,4′-diphenylmethane diisocyanate, polymeric 4,4′-diphenylmethane diisocyanate, toluene diisocyanate, 3,3′-dimethyl-4,4′-biphenylene diisocyanate, p-phenylene diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, and isophorone diisocyanate.

Abstract: A composite golf-club head is disclosed with at least one complex three-dimensional molded composite part. The part has multiple interleaved plies of reinforcing fiber, and has a wall with an interleave ratio greater than about 30, preferably greater than about 100.

Abstract: A golf club head having a defined internal cavity, and a golf club head containing a bi-material weight having a nonhomogeneous structure. A method to add the bi-material weight to the golf club entails heating, vibration and cooling to produce the nonhomogeneous structure.

Abstract: The present invention is directed to improved heads for golf clubs, including iron, wood and putter type golf club heads, and to methods of manufacturing such golf club heads. One or more layers of a loaded film are used to define in part the overall weight, center of gravity, and inertial characteristics of the golf club head, without significantly affecting the structural characteristics of the golf club head. A set of plies of pre-preg composite fiber sheet and one or more layers of loaded film are applied in a predetermined manner to a forming mold to make a preform. The preform is removed from the forming mold. One or more additional layers of densified loaded film may be applied to the preform, and the preform may be placed in a curing mold. In the case of wood type golf club heads, a bladder may be introduced into a hollow core of the preform. The bladder may be inflated, and the mold may be heated for a predetermined period of time.

Abstract: A golf club head including a striking face comprising a recessed area in the striking face and an insert secured in the recessed area. The insert has at least one cavity therein with the cavity terminating short of the outer striking face.

Abstract: The present invention is directed to a golf club head comprising a central core having an outer surface, at least one continuous fiber extending around at least a portion of the outer surface of the core closest to the club face, and an external resin layer which covers the core and the continuous fiber. Preferably, the core is comprised of a syntactic foam which is entirely covered with a braided construction of a plurality of continuous graphite composite fibers.

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 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 method of producing a wood type golf club head which comprises molding and curing integrally an outer shell portion of a head main body having a hollow portion thereinside and equipped with a recess on at least one of the toe, back and heel sides thereof facing the hollow portion, from a synthetic resin as a main material, fixing a weight member having an adjustable weight into the or each recess, packing a core member into the hollow portion, and fitting a sole plate to a sole portion, and such a wood type golf club produced.