Abstract: Disclosed is a golf club set having harmonized golf club performance among the club numbers. In the golf club set, for at least three golf clubs, a ratio or a sum of a frequency per unit time, the frequency being measured by vibrating a tip portion of a golf club shaft constituting each of the golf clubs, and a frequency per unit time, the frequency being measured by vibrating a rear end portion of the golf club shaft, is determined in relation with order of the club number.

Abstract: The present invention discloses a golf club manufactured with an elongated grip that extends down the length of the shaft. The elongated grip allows the golfer to assume a more comfortable choked down hand position which in turn will promote better choked down golf shots and thus better control of non-standard distances. The grip can be of uniform or varying thickness and have a length selected by the golfer to correspond to his preferred choked down hand positions. The present invention also discloses and promotes the use of a set of two or more golf clubs designed to produce distance differentials that exceed those that come with traditional sets.

Abstract: A golf club is evaluated by measuring a moment of inertia about an axis perpendicular to a face plane of the golf club head through a center of a mass of the golf club head. The golf club has the evaluation imparted by a moment of inertia information relating to a value of the moment of inertia or a value obtained by dividing the moment of inertia by a mass value of the golf club head. A golf club set is composed of at least three golf clubs having different loft angles and each of the golf clubs has the size of the moment of inertia adjusted corresponding to an order of golf club number or an order of a value of the loft angle. The moment of inertia changes linearly corresponding to the order of the golf club number or the loft angle.

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: In accordance with the present invention, a set of golf club heads is disclosed. The set includes golf club heads with peripheral weights. The dimensions and configuration of at least the peripheral weights are changed from club-to-club along the set so that the center of gravity rises from the long irons to the short irons. By raising the center of gravity from the long irons to the short irons, a golfer will see a peak trajectory height along a line for each club head that is substantially more consistent along that line throughout the set than prior art clubs provide.

Abstract: A golf club includes a shaft, a head attached to the tip end of the shaft, and a grip attached at the butt end of the shaft. The 14-inch balance is D0 or more. The club has initial velocity per equivalent pendulum length Vb/Lp that is larger than −3.57 Lc+64.58 when Lc represents the club length. The initial velocity Vb is defined as: Vb=1.8 Mh(56.22 Lc−35.16 Mc−39.77 Lp+31.61)/(Mh+0.0455) where Mh is the mass of the head (kg) and Mc is the total mass of the club.

Abstract: The holy grail of golf is to create a set of clubs that facilitate a consistent swing one where the golfer's tempo and/or ball striking accuracy remain relatively constant between clubs. The human body is such that tempo changes as shaft length and club head weight are varied. By measuring tempo at various length and weight combinations and forming a range of length/weight combinations that produce a consistent swing, it is possible to construct a set of golf clubs that meets target distances while maintaining tempo and accuracy.

Abstract: A method is disclosed for effectively guiding golfers and/or their fitting professionals toward the selection of a particular wood-type golf club that is optimally matched or fitted to each golfer's particular swing characteristics, the selection being made from a set of golf clubs having at least three different head sizes and being made based on one or more swing characteristics for the golfer.

Abstract: A method and system is therefore provided for fitting a set of golf clubs to a particular golfer. In particular, the club fitting method and system assists a golfer in the selection of a set of golf clubs by providing objective indicia or scores representative of the manner in which the golfer hits golf shots with each of a number of different golf clubs. The club fitting method and system provide the golfer with numerical values representative of the consistency and performance of the golf shots made with a particular golf club, typically on an automatic basis. Based upon the relative numerical values representative of the consistency and performance of the golf shots made with a number of different golf clubs, the golfer can select the set of golf clubs which provides the combination of consistency and performance that is best suited for the golfer's game.

Abstract: In an iron club set, the lie angle of each iron club in an iron club set is selected to be 61 degrees or larger. The lie angles of the iron clubs are set at a fixed value for every type of the iron clubs including a short iron to a long iron or progressively increase in angle value from the short iron to the long iron. Further, a ratio (L/H) of the minimum height (L) of the face at the heel to the maximum height (H) of the face of the club head, progressively increase in value in going to the long irons.

Abstract: A golf club set comprises at least three golf clubs having different loft angles changing progressively from the smallest loft angle of the lowest numbered golf club to the largest loft angle of the highest numbered golf club. Each of the golf clubs comprises a shaft and a head, the head provided with a hosel having a shaft inserting hole into which the shaft is inserted.

Abstract: A golf club equivalent in driving distance to a standard 2-iron, 3-iron, 4-iron, 5-iron or 6-iron, where each club varies from the equivalent standard iron club in that the shaft is shorter, the loft angle is decreased, the lie angle is increased, and the club head weight is increased, where the swing weight remains approximately the same and where the club head is a metal club head of the type used for drivers and fairway woods.

Abstract: The present invention relates to a golf club bag having a club separating collar having a plurality of openings therein for receiving individual golf clubs therein. The collar has a plurality of color coded areas or zones, each area surrounding a plurality of openings in the collar to identify golf club types to allow the rapid removal and placement of a golf club to and from a predetermined area. Each golf club has color coding thereon, such as on the shaft adjacent the golf club head, to match one of the area colors on the golf bag collar for rapid identification of the golf clubs. The golf club collar can include a self-lubricating polymer TEFLON insert placed in each opening within the collar to prevent damage to the golf club shaft on inserting and removing a golf club from the golf club bag.

Abstract: A system and method for fitting a golfer with one or more golf clubs. The system or method comprises measuring one or more swing characteristics of a golfer and selecting a swing coefficient that is a function of one or more measured swing characteristics of the golfer. Thereafter fitting the golfer with one or more golf clubs based on a correlation between the swing coefficient and the natural frequency of the golf club selected.

Abstract: Disclosed is an iron golf club set which comprises a plurality of golf clubs of different counts, each golf club having a steel shaft, wherein a steel shaft of a shorter golf club is set heavier than that of a longer golf club; a step formation region is provided in a position having an equal distance for all of the golf clubs from a grip end in a shaft axial direction, the step formation region having a shaft outer diameter changed in a plurality of steps therein; a specific area is set in a position having an equal distance for all of the golf clubs from a sole end of a head in the shaft axial direction, and is nearer to a grip with respect to a shaft full length in the step formation region of each golf club; and a step interval in the specific area is set narrower than that outside the specific area.

Abstract: A golf club is evaluated by measuring a moment of inertia about an axis perpendicular to a face plane of the golf club head through a center of a mass of the golf club head. The golf club has the evaluation imparted by a moment of inertia information relating to a value of the moment of inertia or a value obtained by dividing the moment of inertia by a mass value of the golf club head. A golf club set is composed of at least three golf clubs having different loft angles and each of the golf clubs has the size of the moment of inertia adjusted corresponding to an order of golf club number or an order of a value of the loft angle. The moment of inertia changes linearly corresponding to the order of the golf club number or the loft angle.

Abstract: The golf club has a length over 0.99 m, a loft angle of at least 35°, a head mass of about 0.260 kg or less, and a lie angle of less than 60°. The golf club allows long and high slots.

Abstract: The present invention involves a golf tee coated with colored coatings that when struck with a golf club leave a marking that easily identifies where the ball was struck on the club face and the path of the swing, but does not come off in normal handling. The tee leaves a multicolored marking on the club face that is used to show the swing path of a golfer's swing and the point of impact of the tee on the face of the golf club. The tee has a center line or mark that represents the middle, which establishes the optimum hitting area. This line or mark is also an indicator for the golfer to line up in the direction they are trying to hit the ball. On either side of this colored line or mark is a different color that indicates the swing path when shown on the club face.

Abstract: A golf club set in which the attenuation rate of torque oscillation of club shafts is optimized for every individual club. The attenuation rate of torque oscillation of club shafts is controlled so as to be larger as the corresponding loft angles of the clubs increase.

Abstract: A golf club set in which the weight balance of club shafts is optimized for each individual club. The weight balance at the grip-end of the shaft of each of the individual golf clubs increases as the corresponding loft angles of each of the individual golf clubs increase.

Abstract: A golf club putter head is provided in the shape of a quarter cylinder with a quarter cylinder outer surface having an imprintable material thereon. Four such golf club putter heads may be assembled and inserted into a cylindrical imprinting apparatus, such as an imprinter for coffee mugs for imprinting custom images and designs on the outer cylindrical portion of the putter heads.

Abstract: A set of golf clubs which utilizes progressively longer hosel lengths for the purpose of enlarging the main body of the clubhead and/or redistributing weight within the main body of the clubhead. The hosel length progresses from a very short hosel (1 3/8") on the lowest lofted iron, (the number 1 iron), to a conventional length hosel (25/8") on the sand wedge. By reducing the length of the hosel, weight is made available that can be used to enlarge the size of the clubhead and/or redistribute weight within the main body of the clubhead.

Abstract: The present invention provides a multi-use golf club which allows a user to select a long or short shot without changing the dynamics of the user's golf swing. This is accomplished with a hand grip having at least two hand grip position designations located thereon, each hand grip designation defining a different set of golf club characteristics. During use, characteristics associated with a long shot are exhibited when the user's grip is positioned adjacent one hand grip designation, and characteristics associated with a short shot are exhibited when the users's grip is positioned adjacent the other hand grip designation. Additionally, the present invention implements a variable diameter golf club shaft which is uniquely calibrated for users having reduced club head speed swings such as junior and senior golfers. The solid core shaft of the present invention has a preselected taper portion and flex point adjustably located intermediate the top and bottom ends of the shaft.

Abstract: A device-coupled golf club 80 includes a club head 64 which is assembled with a shaft 22 by use of a coupling device 40. Club head 64 is formed with a hosel 68 which is formed with a bore 70 having threads 76 formed in an upper portion thereof and a floor 74 at the base thereof. Coupling device 40 is formed with a body 41 having a bore 42 formed axially therethrough. A flange 44 is formed radially outwardly from one end of the body 41 and is formed with threads 50 from the flange toward the opposite axial end of the body. A ferrule 56 is located on shaft 22 and a tip end 30 of the shaft is inserted into bore 42 of body 41 and secured there by an epoxy glue 82. An exterior surface of body 41 is formed with threads 50 which engage threads 76 formed within bore 70 of hosel 68 to removably secure device 40 with head 64 whereby shaft 22 is assembled with the head 64 to form club 80.

Abstract: A golf club or set of golf clubs include a sole having three surfaces: an entrance surface, a bounce surface and a trailing surface. The bounce surface is angled from the ground with a bounce angle and has a pair of cavities that are aligned with the sole of the golf club.

Abstract: A traveling golf club kit which enables a user to easily transport a set of golf clubs. In its broadest context the present invention includes a collapsible golf bag and a set of clubs, wherein each of the clubs has an assembled configuration and a disassembled configuration. The various components of the present invention, and the manner in which they interrelate, will be described in greater detail hereinafter.

Abstract: A matched pair of golf clubs, designed for putting and chipping usage, which have identical heads with identical shafts and grips except that one head has a striking face with the loft of a putter and the other head has a striking face with the loft of a chipper, the said clubs being otherwise identical in weight, length, balance and feel. Preferably each head has a striking face with the loft of a putter and a reverse striking face with the loft of a chipper, with one club being a right handed putter and a left handed chipper and the other club being right handed chipper and a left handed putter. Chipping and putting with these clubs, using the clubs in sequence and in the manner of a putter, tends to improve the golfer's confidence and the chances of finishing a hole with fewer strokes than might otherwise be the case.

Abstract: A mechanical locking device for use in attaching the shaft of a golf club to the clubhead. An angle is cast inside the hosel at the base of the hosel bore. The tip of the shaft is cut at an angle matching the angle at the bottom of the hosel bore, such that when the shaft is inserted into the bore, there is no room for lateral movement or twisting of the shaft. This device eliminates the risk that the shaft will separate from the clubhead if the epoxy cement bond should break.

Abstract: An iron golf club set comprising a plurality of clubs with varying lofts and insets, in which the inset of each club is equal to or less than the inset for the next club in the set with less club loft and there are at least three different insets within the set. In a preferred embodiment, the plurality of clubs have offsets, in which the offset of each club is equal to or less than the offset for the next club in the set with less club loft and there are at least three different offsets within the set.

Abstract: A set of golf club irons having common swing weights segregated into distance irons, fairway irons and accuracy irons, each grouping having common shaft lengths and lie angles. Each club head is vertically, horizontally and laterally balanced about its sweet spot. The areas of the faces of each club are substantially identical.Each club face has multiple, generally parallel, horizontal, V-shaped scoring. The distance and fairway irons have scoring which promotes top spin in the ball. The accuracy irons have scoring which promotes back spin.

Abstract: A series of golf clubs, in which each head includes at least one outer median rib in relief with respect to a sole and substantially perpendicular to an attack edge, wherein the width of the rib decreases when the loft angle increases in this series.