Abstract: A golf club head having localized heat treatment is described herein. Other embodiments are disclosed.

Abstract: A shaft for a golf club includes a first end, a second end, and a demarcation. The first end is adapted to attach to a club head. The second end is adapted to receive a grip distal to the first end. The demarcation is positioned at or adjacent to the balance point of the golf club between the first end and the second end.

Abstract: Disclosed herein is an iron-type golf club head comprising a body comprising a heel portion, a sole portion, a toe portion, and a topline portion. The topline portion has a mass per unit length of between 0.09 g/mm and 0.40 g/mm. The golf club head also comprises a strike plate coupled to the body at a front portion of the golf club head and a cavity defined between the topline portion, the sole portion, and the strike plate. The golf club head further comprises a bridge bar at a rear portion of the golf club head. The bridge bar spans the cavity, is spaced apart from the strike plate, and is rigidly fixed to and extends uprightly between the sole portion and the topline portion. The bridge bar has a mass per unit length of between 0.09 g/mm and 0.40 g/mm.

Abstract: A golf club includes a head; a shaft having a tip end and a butt end; and a grip. The golf club has a length of greater than or equal to 45.0 inches. The head has a weight of greater than or equal to 195 g. The golf club has a club moment about a rotation center of less than or equal to 22.74 (kg·cm), the rotation center being a point 100 mm away from a butt end of the grip. The shaft may have a weight of less than or equal to 40 g. The golf club has a weight of greater than or equal to 280 g. A butt end region having a distance from the butt end of the grip of 100 mm or less may have a weight of greater than or equal to 27 g. This golf club can exhibit an on-plane effect.

Abstract: A golf club includes a head, a shaft, and a grip. The golf club has a club vibration frequency of less than or equal to 210 cpm. The golf club has a swing weight of greater than or equal to D5. With the golf club, a force acting on the player's body during a swing can be reduced. The golf club can stabilize swing.

Abstract: A club 2 includes a head 4, a shaft 6, and a grip 8. A club length L1 is 43 inches or greater and 48 inches or less. A ratio (Wh/Wc) of a head weight Wh to a club weight Wc is equal to or greater than 0.66. An inertia moment Ix about a swing axis is 7.20×103 (kg·cm2) or greater and 7.50×103 (kg·cm2) or less. A static moment Mt (kg·cm) of the club is equal to or greater than 16.0 (kg·cm). The inertia moment Ix (kg·cm2) is calculated by the following formula (1). Lc is an axial-directional distance between a grip end and a center of gravity of the club.

Abstract: Golf club heads with cavities and inserts, and methods to manufacture golf club heads with cavities. Various embodiments include a golf club head comprising a body. The body comprises a strikeface at a front of the golf club head, a backface opposite the strikeface, a heel region, a toe region opposite the heel region, a sole, a rear portion at a rear of the golf club head, and a cavity located between the backface and the rear portion. In many embodiments, the body further comprises an insert within the cavity.

Abstract: The present invention provides a non-transitory computer-readable storage medium storing a program that causes a computer of a portable terminal including a display device to function as: a registration unit accepting registration of user information including at least information about a swing characteristic of a user; an accepting unit accepting input of specifying information that specifies a golf product; a calculation unit reading out information of the golf product specified by the specifying information from a database and calculating a degree of fitting of the golf product to the user based on the readout information and the user information; and a display control unit causing the display device to display a calculation result of the calculation unit.

Abstract: A system of golf club heads having reduced variability in characteristic time is disclosed herein. Further, a method of manufacturing a system of golf club heads having reduced variability in characteristic time is disclosed herein.

Abstract: A method for making a metal to composite tube joint including selecting an elongated interior fitting constructed with an exterior barrel, reduced in exterior diameter to form a distally facing annular shoulder and then projecting still further distally to form an interior sleeve having a radially outwardly facing bonding surface. Selecting an elongated metal outer sleeve formed proximally with a collar constructed for receipt over the barrel and increased in interior diameter and projecting distally to form an exterior sleeve having a radially inwardly facing bonding surface cooperating with the first bonding surface to form an annulus receiving an extremity of a composite tube and a bond bonding the extremity of the tube to the bonding surfaces.

Abstract: The club length of a golf club is 43 inches or greater and 48 inches or less. A club inertia moment Ix about a swing axis is equal to or less than 6.90×103 (kg·cm2). A ratio (Ihs/Ix) is equal to or greater than 0.88, if a head inertia moment about the swing axis is defined as Ihs (kg·cm2). The inertia moment Ix (kg·cm2) is calculated by Equation (1) below, and the inertia moment Ihs (kg·cm2) is calculated by Equation (2) below: Ix=Wc×(Lc+60)2+Ic??(1) Ihs=Wh×(Lh+60)2+Ih??(2).

Abstract: Embodiments of golf clubs head sets with varying characteristics are disclosed herein. Other examples and related methods are also generally described herein.

Abstract: A ball striking device, such as a golf club head, has a face with a striking surface configured for striking a ball, a channel extending across a portion of the sole, wherein the channel is recessed from adjacent surfaces of the sole, a void defined on the sole of the body, and/or at least one external rib connected to the cover and extending downward from the cover. The at least one external rib may include a first external rib and a second external rib wherein each external rib is connected to the cover and extends downward from the cover, such that the external ribs are positioned within the void.

Abstract: A club includes a head, a shaft, and a grip. A club length L1 is 43 inches or greater and 48 inches or less. A ratio (Wh/Wc) between a head weight Wh and a club weight Wc is equal to or greater than 0.70. An inertia moment Ix about swing axis is 6.90×103 (kg·cm2) or greater and 7.50×103 (kg·cm2) or less. A static moment Mt (kg·cm) of the club is equal to or greater than 16.3 (kg·cm). The frequency of vibration of club is 240 (cpm) or greater and 280 (cpm) or less. The inertia moment Ix (kg·cm2) is calculated by Equation (1): Ix=Wc×(Lc+60)2+Ic??(1).

Abstract: The club length of a golf club is 43 inches or greater and 48 inches or less. A club inertia moment Ix about a swing axis is equal to or less than 6.90×103 (kg·cm2). A ratio (Ihs/Ix) is equal to or greater than 0.88, if a head inertia moment about the swing axis is defined as Ihs (kg·cm2). The inertia moment Ix (kg·cm2) is calculated by Equation (1) below, and the inertia moment Ihs (kg·cm2) is calculated by Equation (2) below: Ix=Wc×(Lc+60)2+Ic??(1) Ihs=Wh×(Lh+60)2+Ih??(2).

Abstract: A club 2 includes a head 4, a shaft 6 and a grip 8. A club length L1 is 45 inches or greater and 48 inches or less. A ratio (Wh/Wc) of a head weight Wh to a club weight Wc is equal to or greater than 0.71. A moment of inertia Ix about an axis of a swing is equal to or less than 6.90×103 (kg·cm2). However, when the club weight is defined as Wc (kg); an axial-directional distance between a grip end and a center of gravity of the club is defined as Lc (cm); and a moment of inertia about the center of gravity of the club is defined as Ic (kg·cm2), the moment of inertia Ix (kg·cm2) is calculated by the following formula (1).

Abstract: There is provided a method and system for matching golf clubs to a specific user. The method includes providing both a height and a weight of the specific user; determining physical parameters of the specific user from both the height and the weight; providing data for each golf club; obtaining optimal club mass for a Driver; obtaining optimal values of both a moment of inertia about a grip center and a mass for each golf club; and modifying each golf club to enable each golf club to attain the optimal values. The system involves utilizing the aforementioned information gathered for the method. It is advantageous that each of the golf clubs matched to the specific user are effectively employed with an application of identical swings from the specific user.

Abstract: A golf club set comprises golf clubs with different club lengths, each golf club comprising a hollow golf club head, the golf club head with a face portion having a clubface for hitting a ball, the face portion comprising a central thicker portion, a toe-side thinner portion with a thickness smaller than that of the central thicker portion, and a heel-side thinner portion with a thickness smaller than that of the central thicker portion, wherein in a front view of the club head under a standard state, the toe-side thinner portion is provided so that a centroid thereof is placed upward than a center of the clubface, the heel-side thinner portion is provided so that a centroid thereof is placed downward than the center of the clubface.

Abstract: Some embodiments include a set of golf club shafts configured for consistent club gapping. Other embodiments for related golf club shafts and golf clubs, and related methods are also disclosed.

Abstract: The present invention is direct to a set of golf clubs comprising long irons, mid-irons and short irons. The long irons have a first center of gravity positioned horizontally from the face center by a first distance. The mid-irons have a second center of gravity positioned horizontally from the face center by a second distance. The short irons have a third center of gravity positioned horizontally from the face center by a third distance.

Abstract: A golf club holder includes an elongate body having a first end and a second end. A ground engaging member is positioned at the first end, whereby the elongate body is supported in a ground surface in a substantially vertical orientation. A socket is provided for detachably securing a first end of at least one golf club spaced from the first end of the elongate body. A clamp is provided for detachably securing a second end of the at least one golf club spaced from the second end of the elongate body.

Abstract: The invention provides methods and collections of golf clubs that offer a variety of golf club sets from a limited number of golf clubs. The golf clubs are designed such that a golfer can choose one of multiple different, distinct subsets of the collection based on matching the properties of the clubs of the subset to that golfer's needs. In this way, the club maker can provide several different subsets by manufacturing fewer clubs than would be otherwise required. For example, a manufacturer can make one collection of 16 clubs. From that collection of 16 clubs , one golfer could choose a first set of 8 irons, a second golfer could choose a second set of 8 irons, and a third golfer could choose a third set of 8 irons.

Abstract: A set of golf clubs having a degree of adjustability to provide improved distance gapping across the transition from a curved face golf club head to a flat face golf club head.

Abstract: Embodiments of a mesh golf tee are disclosed having a shaft and an upper mesh portion for supporting a golf ball. The upper mesh portion may provide less resistance to a club to allow greater power applied to the ball. The mesh portion may also flex such that the ball is not deflected by any portion of the tee upon impact by a golf club, allowing for greater consistency.

Abstract: Embodiments of golf clubs head sets with varying characteristics are disclosed herein. Other examples and related methods are also generally described herein.

Abstract: A golf club head with a multi-component construction. The golf club head can include one or more components such as inserts, panels, plates, or body members that fasten to one another to form a club head body or that fasten to a club head body. The club head can include one or more components that snap-fit into a club head body. An insert can be made entirely or partially of plastic.

Abstract: Embodiments of multiple flex shaft systems are disclosed herein. Other examples and related methods are also presented herein.

Abstract: The present invention relates to a set of at least three golf clubs having different club length Lk. The golf clubs 14; 20 comprises a shaft 21 with an upper end and a lower end, a grip section 22 on the upper end of the shaft, and a head 23; 30; 40 with a ball-striking surface mounted on the lower end of the shaft. The club length Lk of each golf club decreasing through the set and a value 61, 65, 75; 62, 66, 76; 63,67,77; 64, 68; 78 of at least one torsional moment PCF; HCF; ICF; GCF for each of the at least three golf clubs when swung by a golfer differs from each other. A linear function 71, 72, 73, 74 of club length Lk is based on the values of at least one torsional moment.

Abstract: A golf club grip system is presented comprised of golf club grips of identical weights regardless of their grip thickness. The identical weight may be maintained by altering the grip material compound, grip construction method, or by varying the length of the grip along the golf club shaft as the grip width is varied. A set of standardized grip widths is also presented that varies in increments of the thickness of duct tape, thus providing a standard method of adjusting the thickness of a golf club grip on a shaft. The system is designed to permit pre-manufactured golf club grips to be selected by grip thickness and feel, while remaining identically weighted to all other possible thicknesses. This uniform weighting removes the need to adjust club head weight or perform dynamic or static swing weighting after grip thickness is selected.

Abstract: A golf club set comprises golf clubs with different club lengths, each golf club comprising a hollow golf club head, the golf club head with a face portion having a clubface for hitting a ball, the face portion comprising a central thicker portion, a toe-side thinner portion with a thickness smaller than that of the central thicker portion, and a heel-side thinner portion with a thickness smaller than that of the central thicker portion, wherein in a front view of the club head under a standard state, the toe-side thinner portion is provided so that a centroid thereof is placed upward than a center of the clubface, the heel-side thinner portion is provided so that a centroid thereof is placed downward than the center of the clubface.

Abstract: A method and apparatus for providing a golfer with a set of clubs that are each configured to match the golfer's specific hand height. A measuring club can be used to measure the golfer's hand height, which can then be adjusted (decreased by a constant amount) to account for bending at the pelvic waist. Any number and type of golf clubs can then be made for the golfer by determining a lie angle and club length that all match the adjusted hand height. Sets of clubs, each set configured for a particular adjusted hand height, can also be stocked by a store and sold to a customer (golfer), the golfer receiving a set that matches his/her adjusted hand height. In this manner, the golfer can use all of these constant hand height clubs without having to change his or her stance for each of the clubs since the clubs are all configured to match the hand height of the golfer.

Abstract: A golf club of the present invention comprises at least one adjusting mechanism. In the golf club, at least two specifications can be adjusted independently of each other. Preferably, a head, a shaft, a grip, or a joined part therebetween has an adjusting mechanism (1). The head, the shaft, the grip, or the joined part has further other adjusting mechanism (2). Preferably, the adjusting mechanism (1) and the adjusting mechanism (2) can work independently of each other. The number of the adjusting mechanisms is not restricted. Since the plurality of specifications can be adjusted independently of each other, a degree of freedom of adjustability is improved. These adjusting mechanisms can improve accuracy of the adjustability. The specification capable of being adjusted is not restricted.

Abstract: A holder for holding a limited number of golf clubs, less than a full standard set of clubs, in an organized way. The holder may comprise three manually assembled snap fit components including two end plates and a central shaft which spans and connects the two end plates. Each end plate may be identical to the other, having a plurality of recesses located about its periphery, for receiving the shafts of golf clubs in releasable snap fit fashion. The end plates and their recesses are arranged so that the golf clubs are held parallel to one another and to the central shaft of the holder. The central shaft may be contoured to include finger grips for example, thereby serving as a handle for grasping the holder both alone and also with golf clubs retained thereon.

Abstract: The present invention relates to a method for determining club parameters for at least one golf club, belonging to a set of golf clubs for a specific golfer, having arbitrary club length Lk,n. The method comprises: selecting club length of a first reference golf club and a second reference club; varying at least one club parameter belong to the group: club weight, club head weight, CG position and weight distribution of the first reference golf club and the second reference golf club; selecting a club parameter value for each selected club parameter. At least one torsional moment PCF, ICF, HCF, GCF is calculated and a relationship is determined as a function of club length. A club length for a first golf club belonging to the set of golf clubs is selected and club parameters for the first golf club is determined based on each determined relationship.

Abstract: The present invention is directed to a golf club head with an improved striking surface. Grooves are machined into the strike surface with tight tolerances. The grooves have sharp edges, radiused ends, and a draft angle between about 2° and 12°. The striking face is machined such that it has a uniform texture with a roughness of more than 40 Ra. The grooves may contain a plurality of portions, including a radiused or angled portion, a portion having substantially parallel walls, a portion having a v-shape, and a curved portion. The grooves may also be characterized by various dimensions, including draft angle, inclusive side wall angle, width, depth, cross-sectional area, spacing, and pitch ratio. Preferred values for these dimensions are provided. A golf club head having a variety of groove types and a set of golf clubs with grooves varying among the individual clubs of the set are also disclosed.

Abstract: The examples provided describe a golf club having a hollow rail member constructed to provide improved strength while reducing weight. The weight removed by using the hollow rail member may be redistributed to change club performance. Other embodiments may be described and claimed.

Abstract: A set of iron clubs where each club in the set has the same or substantially the same ground roll. The set is produced by adjusting at least two club design characteristics of the clubs based upon measured or assumed player swing data. The design characteristics of the clubs include club length, static clubhead loft, location of the center of gravity, shaft flexibility, and groove volume. Preferably, club length and static clubhead loft are adjusted for coarse adjustments, while the other characteristics are used to fine-tune the design.

Abstract: The subject invention is comprised of a striking member adapted to emulate a specific selected sport, such striking member having removable indicator appendages that enable the user to feel by vibration and replicate by sight where the striking member is during the striking movement, and a target member adapted to emulate the playing object of the same selected sport, the target member including flexible, elongate momentum elements selectively attachable to the target member to provide progressive resistance and accurately simulate the characteristics of an actual ball or playing object.

Abstract: A set of golf clubs is provided with shafts that have a bend formed by three shaft segments. The second shaft segment connects the first and third shaft segments and offsets the third shaft segment from the first shaft segment, wherein the third shaft segment is on a line parallel to a line extending along the first shaft segment. Shafts offset as described are attached to a set of golf club heads such that the offset shafts are positioned in a forward offset position in front of the impact surface of the golf club head with the degree of forward offset increasing with the increasing club number of the club heads of the set. The overall degree of offset can be increased or decreased based on the skill of the golfer using the clubs.

Abstract: A set of golf club wedges each having a club face (10) is disclosed wherein the lofts of the individual clubs progressively increases. The hitting surface of each club head may take the form of an insert (12) that includes a series of grooves, the design of which is varied from club to club to provide increasing friction with loft. As a result, a golfer can impart the same amount of spin to a golf ball with each of the wedges despite a substantial difference in loft and club head swing speed between the respective clubs. In addition, the surface roughness of the hitting surface may also be increased as loft increases to further control the spin imparted to the ball.

Abstract: An apparatus for playing a game of golf for at least two players, each player having a set of golf clubs including a plurality of irons, a plurality of woods and a putter, includes a game set of indicators that includes a club set of indicators bearing club identifications, a reserve set of indicators bearing reserve indications, a shot set of indicators bearing shot indications and a flag set of indicators bearing flag indications; and, a container for holding the game set of indicators and permitting a player to randomly and blindly draw one of the indicators.

Abstract: A golf teaching technique is enclosed, in addition to golf equipment for teaching and recreation. The equipment includes golf clubs, balls, and targets, and also includes a method for teaching students how to properly use these items.

Abstract: A set of golf club irons of the blade type is characterized by a weight pad behind the impact area of the club face which progressively increases in height through the set from the long irons to the short irons. In addition, the thickness of the sole portion of each head increases through the set to progressively increase the weight at the bottom of the club heads. The clubs provide improved feel to the golfer which enable the golfer to work the ball more easily during execution of a golf shot.

Abstract: As the club number increases so that the loft angle is larger, the center-of-gravity height HG of each head becomes larger, and the center-of-gravity depth ZG thereof becomes smaller. Each head is hollow, and a face portion becomes thicker in its lower portion. The back bottom thickness T is smaller in an iron shorter in club length.

Abstract: A set of golf club wedges each having a club face (10) is disclosed wherein the lofts of the individual clubs progressively increases. The hitting surface of each club head may take the form of an insert (12) that includes a series of grooves, the design of which is varied from club to club to provide increasing friction with loft. As a result, a golfer can impart the same amount of spin to a golf ball with each of the wedges despite a substantial difference in loft and club head swing speed between the respective clubs. In addition, the surface roughness of the hitting surface may also be increased as loft increases to further control the spin imparted to the ball.

Abstract: An improved golf club fitting system for fitting a set of golf clubs to a player includes the steps of measuring a player's hand grip strength and selecting a representative golf club having a dead weight directly proportional to the player's grip strength. The club length and the swing weight of the representative golf club are then determined by standard testing procedures commonly used in the golf club industry. A balance index (BI) for the representative golf club is then computed by dividing the dead weight (DW) by the swing weight (SW) (DW/SW=BI) and the balance index (BI) is compared to the dead weight to determine generally corresponding values for the remaining other golf clubs in the set such that the system user can match different irons and woods to the representative golf club thereby creating an ideal matched set of golf clubs for the player.

Abstract: A method and apparatus for prescribing overall club length for iron-type golf clubs for an individual player wherein the method comprises measuring the erect height (PH) of a player to be fitted, providing the player with a fitting ball club (FBC) having a spherical ball with a hosel bore therein, one end of a golf club shaft in the hosel bore and a golf club grip on the other end of the shaft, having the player hold the fitting ball club in address position as if about to hit a golf ball therewith, measuring the wrist-to-floor distance (WFM) vertically from the player's higher wrist to the floor, locating in the first two columns of the FIG. 4 table data corresponding to the PH and WFM measurements, respectively, for the player, deriving an incremental length LCC from the third, length control club column of FIG. 4, and adding that incremental LCC length to 37½ inches, thereby giving a prescribed overall club length for that player.

Abstract: A set of golf club shafts is provided including a plurality of shafts progressively increasing in length. Each shaft includes a butt section formed of a first material coupled to a tip section formed of a second, different material. The length of each tip section is inversely proportional to the overall length of the shaft. As such, the tip sections progressively decrease in length as the plurality of shafts progressively increase in length.

Abstract: A long and belly length putter fitment system includes a lower shaft section, an upper shaft section, and a coupler to join the upper and lower sections to form one singular putter. The upper and lower sections are selected from a selection having various lengths. Upper sections, each of differing length, may be combined in various combinations with lower sections, each of different overall length and/or lower section grip height, according to a fitment table. All upper shaft sections are compatible with all lower shaft sections through the use of the shaft coupler. Lower shaft sections can utilize shafts of various specifications with any number of putterhead styles or models affixed to the distal end of the lower shaft section.

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.