Abstract: A golf training device for use with a swinging driver golf club on a golf ball simulating target having a diameter substantially equal to the diameter of a real golf ball and a durable turf simulation apparatus. The target unit comprises a golf ball simulating target disposed on a curved tee attached to a pivotal base. The turf simulation apparatus includes a foundation layer, stiffening layer and upper layer. The foundation layer defines an aperture which surrounds the area around the target unit. The turf simulation apparatus dampens the force of a striking golf club head for reducing damage to the club head and rebounding forces to the golfer's wrists and arms.

Abstract: A golf ball having a thermosetting polyurethane cover composed of a blend of polyurethane prepolymers is disclosed herein. The blend may be a dual blend with a TDI-based polyurethane prepolymer blended with a second diisocyanate polyurethane prepolymer, typically a PPDI-based polyurethane prepolymer. The blend may also be a tri-blend with a TDI-based polyurethane prepolymer blended with two other diisocyanate polyurethane prepolymers, typically two different PPDI-based polyurethane prepolymers. The golf ball has a durability of at least 3.5 on a shear test rating of the cover.

Abstract: In a multi-piece golf ball comprising a solid core, an intermediate layer, and a cover, the intermediate layer and/or the cover is formed of a heated mixture having a melt index of at least 1.0 dg/min and comprising (a) an olefin-carboxylic acid random copolymer and/or (d) a metal ion-neutralized olefin-carboxylic acid random copolymer and/or a metal ion-neutralized olefin-carboxylic acid-carboxylate random copolymer; (b) a fatty acid or derivative having a molecular weight of at least 280; and (c) a neutralizing basic inorganic metal compound. All expressed in Shore D hardness, the intermediate layer has a hardness of 40-63, the cover has a hardness of 45-68, and they satisfy the relationship: the hardness of solid core at its center≦the hardness of intermediate layer≦the hardness of cover.

Abstract: A multi-piece solid golf ball includes a solid core, at least one intermediate layer, and a cover having at least one cover layer. The solid core has a compression deflection of 3.0 mm or more, the intermediate layer is mainly made from a thermoplastic resin and has a Shore D hardness of 45 to 55 and a specific gravity of 1.2 or less, and the cover has a Shore D hardness of 60 or more and a thickness of 1.6 to 2.3 mm. The golf ball further comprises a ratio of the compression deflection of a sphere composed of the solid core covered with the intermediate layer to the compression deflection of the solid core is more than 0.900 and less than 0.970; and a difference in JIS-C hardness between the surface and the center of the solid core is equal to or less than 5.

Abstract: On a golf ball surface, a marking layer is formed from an ink having a lightness of up to 60 based on the Lab color space, and a transparent or translucent layer containing a pigment having an optical interference effect and capable of selectively reflecting and transmitting light is formed on the marking layer. The golf ball has the unique marking entailing the color flop effect that the color appearance varies over the iridescent spectrum with the viewing angle.

Abstract: A device for the golf practice of short strokes and putting for a practicing person having a chest and upper arms. The device has an elongate object adapted to be fitted between the chest and the upper arms of the practicing person. The object has a central portion curved in a backward direction comprising opposite curved side portions that are curved in the same backward direction and extending to outer portions. The outer portions are curved in a forward direction opposite the backward direction. The device is held across the chest and outer portions are disposed behind the upper arms during the golf club stroke.

Abstract: A multi-piece solid golf ball core with inner layer and outer layer, and at least one layer of cover on the core, with an inner layer core diameter of 24 to 40 mm and a center hardness in JIS-C hardness of 40 to 60; a surface hardness in JIS-C hardness of the inner layer core higher than the center hardness by 20 to 40; the outer layer core thickness of 2.0 to 7.0 mm and a surface hardness in JIS-C hardness of 75 to 90; the outermost layer of the cover 1.0 to 2.0 mm thick and a Shore D of 40 to 63; and the golfball satisfies formula: 0≦{T(C−B)−(60−A)}≦10; where: A, B represent inner layer core's center hardness, surface hardness, respectively, JIS-C; C represents surface hardness (JIS-C) of outer layer core; T represents thickness of outer layer core.

Abstract: A golf putting stroke is taught and practiced using a device that includes a frame element attached to the golf club. The frame element includes a golf club clamping unit that is slidably attached to a frame unit that is supported on the ground. The clamping unit includes elements that are rotatably attached to each other and the golf club is slidably held in the golf club clamping unit. Controlled movement of the golf club is effected by the practice device wherein the golf club can be moved in three rotational directions as well as in two linear directions.

Abstract: The present invention is directed towards a multi-layered core golf ball that comprises a center, a cover and a thin laminate comprising of at least one core layer formed around the center to create an inner ball, wherein the laminate includes at least one outer core layer that is relatively stiff and hard relative to the center, at least one outermost core layer that is heavily filled with a density increasing material and at least one core layer that functions as a moisture vapor barrier. One core layer may serve to provide all the functions in a single layer.

Abstract: The present invention provides ink for golf ball that can be used in printing a mark directly on a cover made from ionomer resin, without the need for a primer coat, while ensuring high durability. The printing ink comprises an acrylic resin and a coloring agent. A golf ball having a durable mark printed thereon and a method of printing a mark efficiently on a surface of a ball body by using the ink are also provided.

Abstract: A golf ball with a precise spin rate is disclosed. The distribution of weight among the layers within the golf ball relative to a centroid radius is realized to precisely control the moment of inertia of the ball. In accordance to one aspect of the present invention, the innermost core of the ball is made from a specific gravity reduced material, and a thin dense layer is accurately located either inside or outside of the centroid radius to create a high spin ball or a low spin ball, respectively, with a high compression and soft feel.

Abstract: A golf swing aid for coupling to a golf club having a shaft having a head on a bottom end thereof and a free top end. The golf swing aid includes a gyro assembly adapted for mounting on the golf club such that a user feels a sensation upon the golf club being swung improperly. The gyro assembly may be removably attached to the golf club, such as the top end thereof, and may further be rotatably and swivelly mounted on the golf club so as to allow a shaft of the gyro assembly to remain vertical during the swing.

Abstract: A thread-wound golf ball, such as a balata-covered golf ball, formed of a center 1a, a rubber thread layer 1b covering the center 1a, and a cover 2 is provided. The center 1a has an outer diameter of 28-35 mm and a Shore A hardness of 10-50. The cover 2 is formed of a mixture containing ionomer resin, thermoplastic elastomer and tackifier and has a Shore D hardness of 45-60. As such, the golf ball exhibits great carry distance with good shot feel, provides high spin rate when shot from the rough or in a raining condition, and that easily comes to a halt.

Abstract: A golf ball includes at least a core, an inner cover, and an outer cover. The inner cover completely encloses the core, and the inner and outer covers are of different colors. A portion of the inner cover penetrates the outer cover and is exposed to the outside on the surface of the golf ball. The exposed portion serves as a mark portion on the surface of the golf ball.

Abstract: A golf practice device comprising: a spring assembly, wherein the spring assembly is capable of at least partially reducing kinetic energy of an associated golf ball; a golf ball, wherein the golf ball is associated with the spring assembly; and a damper assembly, wherein the damper assembly is capable of at least partially dissipating kinetic energy of the golf ball.

Abstract: A golf ball (1) comprises a center (2), a rubber thread layer (3) and a cover (4). The rubber thread layer (3) is formed by winding a drawn rubber thread around the center (2). The rubber thread is obtained by crosslinking a rubber with a sulfur and a vulcanization accelerator. The rubber contains 60% by weight or more of synthetic polyisoprene having a trans 1,4 bond ratio of 2% to 4%. Moreover, the vulcanization accelerator contains 66% by weight or more of a nonbasic vulcanization accelerator and 10% by weight to 30% by weight of an amine type vulcanization accelerator. A weight ratio of an amount of the sulfur to a total amount of the vulcanization accelerator is 0.8/1 to 8/1. The rubber thread rarely causes crystallization during drawing and a thermal deterioration when molding the cover. The golf ball (1) has an excellent resilience performance.

Abstract: The present invention is directed towards an improved golf ball that includes a high-specific gravity central sphere encapsulated in a soft and resilient shell layer. The soft-resilient shell may be formed of polybutadiene rubber. This shell is subsequently wound with thread a wound core, which is then covered. The sphere can be formed of a solid metal or molded of high-specific gravity powder retained in a binding material.

Abstract: A two-piece solid golf ball has good shot feel, excellent flight performance and durability. The JIS-C hardness of core is A, core inward JIS-C hardness at 5 mm inward from the core surface is B, JIS-C surface hardness of the core is C, cover JIS-C hardness is D, distance in mm between center of core and point 5 mm inward from surface of core is K and radius of ball is L, the golf ball satisfies relations: 65≦A≦69, 83≦B≦87, C is lower than B by 1 to 5, and 1.2≦[)D−B)/(L−K)]/[(B−A)/K]≦2.5; and when deformation amount of core at initial load of 10 kgf to final load of 130 kgf is a, and deformation of golf ball when applying initial load of 10 kgf to final load of 130 kgf is b, the deformation difference (a−b) is 0.5 to 0.9.

Abstract: A golf ball with a precise spin rate is disclosed. The distribution of weight among the layers within the golf ball relative to a centroid radius is realized to precisely control the moment of inertia of the ball. In accordance to one aspect of the present invention, a high spin rate golf ball with a dense center, which is positioned radially inside of the centroid radius, and a low specific gravity mantle is provided. In accordance to another aspect of the present invention, a low spin rate golf ball with an inner core and a thin dense layer disposed radially outside of the centroid radius is provided.

Abstract: A golf ball has a core and a cover and, the cover includes at least one thin spherical layer with a thickness of not more than 1.5 mm. The thin layer is molded by injecting an injection molding material at a selected fill speed which is correlated to the melt flow rate of the molding material. The invention facilitates the mass production of golf balls having thin spherical cover layers of uniform thickness which offer potential for further improvements in ball performance.