Abstract: The present invention provides a three-piece golf ball which has an improved controllability at an approach shot while maintaining a long flight distance inherent to a solid golf ball. In the three-piece golf ball, the hardness, the specific gravity, and deformation amounts of the center and the core are determined in consideration of the relationship between each other.

Abstract: A three-piece solid golf ball has excellent flight performance when hit by a driver or a long or a middle iron, and good spin performance when hit by a short iron or approach-shot. The three-piece solid golf ball has a core with a center and intermediate layer on the center; a cover on the core, the center with diameter 29 to 38 mm, hardness difference in JIS-C hardness at any point between its center to surface not more than 7, specific gravity lower than the intermediate layer, the surface hardness in JIS-C hardness of the intermediate layer being higher than the hardness determined at any point in the center; the difference between surface hardness of intermediate layer and hardness at any point in center being within 3° to 20° JIS-C, and cover having a Shore D hardness of less than 60.

Abstract: A seam position deciding apparatus (1) comprises a light source (3), a camera (5) and a computer (7). The computer (7) has operating means (for example, a CPU) and storage means (for example, an RAM) provided therein. Rays are irradiated from the light source (3) toward a golf ball (9). The golf ball (9) is rotated. The camera (5) photographs the golf ball (9). Data on an image thus photographed have a white pixel and a black pixel. If there is the white pixel in a predetermined region of the image, it is decided that a seam is not horizontal. On the other hand, if there is no white pixel in the same region, it is decided that the seam is horizontal. In the seam position deciding apparatus (1), it is possible to decide, with high precision, whether or not the seam of the golf ball (9) is placed in a predetermined position.

Abstract: The present invention provides a thread wound golf ball having soft and good shot feel at the time of hitting, excellent durability and excellent flight performance. The present invention related to a thread wound golf ball comprising a thread wound core composed of a center and a thread rubber layer formed on the center, and a cover composed of an inner cover formed on the thread rubber layer and an outer cover formed on the inner cover, wherein the outer cover has higher hardness than the inner cover, and has a Shore D hardness of not less than 65.

Abstract: The present invention provides a multi-piece solid golf ball having little unevenness in physical properties. The present invention relates to a multi-piece solid golf ball comprising a center, an intermediate layer formed on the center, and a cover covering the intermediate layer, wherein the intermediate layer is composed of one or more layers mainly containing a rubber component, the rubber component for the intermediate layer has a Mooney viscosity of 25 to 40 ML(1+4)100° C.

Abstract: Disclosed is an alkaline storage battery which exhibit exceptional charge/discharge and cycle life characteristics by improved current collection and active material retention of the electrode substrate. The electrode comprises a substrate composed of a conductive core material and fibrous nickel members unitary sintered on both surfaces of the conductive core material, and a layer of an active material filled into the substrate. The fibrous nickel members of the substrate are bent or curved at least at their tip ends inside the active material layer to retain the active material.

Abstract: An electrode excellent in high-rate discharge characteristics is provided by increasing the adhesive strength of the conductive core material to the sintered nickel porous body which form the sintered type substrate. The electrode of the present invention uses a sintered substrate containing a part wherein the diameter of the pores of the sintered nickel porous body becomes successively smaller from the joining interfaces of the conductive core material toward the outside surfaces of the substrate. The region wherein the diameter is greater than in other parts preferably ranges within about 1/5 of the substrate thickness starting from both surfaces of the core material toward the outside surfaces of the substrate.

Abstract: The present invention provides a three-piece solid golf ball which is excellent in rebound performance, flight performance, durability and shot feel at the time of hitting. The present invention provides a three-piece solid golf ball which comprises a core (a) and a cover (3) formed on the core, the core having a two-layer structure of an inner layer core (1) and an outer layer core (2), wherein the inner layer core (1) has a diameter of 31 to 36 mm and a JIS-C hardness of 60 to 85 and the core (2) has a lower JIS-C hardness than the inner layer core by 5 to 25.

Abstract: A three-piece solid golf ball having good shot feel and excellent rebound characteristics, while maintaining the characteristics inherent to the solid golf ball, i.e., excellent flight performance and good durability, wherein the gold ball has a core, an intermediate layer formed on the core, and a cover covering the intermediate layer. The core has a diameter of 30 to 36 mm and a specific gravity less than that of the intermediate layer; a ratio of the intermediate layer-covered core deformation amount/the core deformation amount within the range of 0.75 to 1, and a golf ball having a deformation amount of 2.3 to 3.5 mm, all deformations being measured when applying a load of 130 kgf.

Abstract: Disclosed is a thread wound golf ball comprising a center, a thread rubber layer formed by winding a thread rubber around the center and a cover formed on the thread rubber layer, wherein the thread rubber is obtained by cutting, into a suitable width, a rubber sheet for thread rubber which is obtained by vulcanizing a raw rubber sheet for thread rubber using a pressure rotary drum type continuous vulcanizing device.

Abstract: The present invention provides a coated golf ball having good surface slippage for relatively long period of time. The coated golf ball of the present invention comprises a golf ball body and a paint layer formed thereon, wherein the paint layer is formed from a urethane paint which contains an isocyanate group-containing organic modified polysiloxane in an amount of 0.1 to 20% by weight based on an amount of resin components in the paint.

Abstract: A three-piece solid golf ball which attains a long flight distance with excellent controllability which comprises a core having a two-layer structure of a center and a shell covering the center, and a cover covering the core, whereinthe center has a diameter of 25 to 37 mm, a JIS-C hardness of 60 to 85 at its center point, and a JIS-C hardness difference between the center point and a surface of the center of not more than 4,the shell has a JIS-C surface hardness of 75 to 90, andthe cover has a stiffness modulus of 1,200 to 3,600 kg/cm.sup.2, with; the hardness being measured by a JIS-C type hardness tester.

Abstract: A solid golf ball comprising a core and a cover, wherein the core has a trans structure content in polybutadiene of 10 to 30%. The core is produced by vulcanizing a rubber composition containing a butadiene rubber having cis structure content of not less than 90% before vulcanization, as a base rubber, wherein an amount of trans structure after vulcanization is 10 to 30% and a difference in hardness measured by a JIS-C type hardness tester between the center of the core and each point located from the center to the surface at an interval of 5 mm is not more than 10%.The rubber composition for forming the core comprises a vulcanizing agent, a filler, an organic peroxide and an organophosphorus compound, in addition to the butadiene rubber having cis structure content of not less than 90% before vulcanization.

Abstract: It is a main object of the present invention to impart a high impact resilience to a thread wound golf ball using a liquid center wherein a center bag is filled with a liquid, thereby improving a flying distance, while maintaining a good hit feeling and control properties.

Abstract: Disclosed is a thread wound golf ball which includes a liquid center composed of a rubber bag containing a liquid, a rubber thread layer provided on the outside of the liquid center and a cover for covering the rubber thread layer, wherein the moment of inertia measured at 23.degree. C. of the golf ball is 75 to 80 g.multidot.cm.sup.2 and the rate of increase of a moment of inertia measured at -30.degree. C. to that measured at 23.degree. C. is within 2%.

Abstract: Disclosed is a thread wound golf ball having uniform flying performances, which causes little scattering of weight and inclusion of air into the liquid center, wherein no separation of the paste is arisen. The thread wound golf ball comprises a liquid center, a thread rubber layer and a cover. The liquid center is composed of a paste and a center bag for coating the paste. A viscosity at 23.degree. C. (measured by a B type viscometer) of the paste is 15 to 70 poise.

Abstract: A pair of semispherical molds, each having dimple-forming projections on a connecting portion is used to shape a resinous material into a golf ball having dimples on a seam corresponding to the connecting portion. A ball fixing means is utilized to hold the golf ball thereto with the seam uncovered. A cutting member disposed at an end of a rotary shaft, and having a radius of curvature smaller than a sectional radius of curvature of the dimple is utilized to remove a burr from the seam of the golf ball. The rotary shaft rotates on its axis and moves forward when the cutting member is brought into contact with the dimple on the seam and backward when the cutting member is brought into contact with a convex land portion. The cutting member is then pressed against the seam successively in alternate contact with the dimples and the land portions.

Abstract: An apparatus for removing the burr from the seam of a golf ball made using a pair of semispherical molds each having dimple-forming projections on a connecting portion to shape resin into a golf ball having dimples on a seam corresponding to the connecting portion. A ball fixing mechanism holds the golf ball thereto with the seam uncovered. A cutting member having a cutting member, disposed at an end of a rotary shaft, having a radius of curvature smaller than a sectional radius of curvature of each of the dimples. The rotary shaft rotates on its axis and moves forward when the cutting member is brought into contact with each of the dimples on the seam and backward when the cutting member is brought into contact with a convex land thereon. Thereafter, the cutting member is pressed against the seam successively removing the burr while maintaining the integrity of each of the dimples.

Abstract: A golf ball (G) comprises a liquid center (1), a rubber thread layer (2) formed around the liquid center (1) and a cover (3) covering the rubber thread layer (2), wherein said liquid center (1) has a diameter (L1) of 29.5 to 32.0 mm and the ratio, Y, of the sum total of the flat surface area (5S) of dimples (5) to the surface area (G-1) of the same sphere having no dimples formed thereon is within the range of 0.80 to 0.84. The total volumes of dimples (5) are in the range of 290 to 340 mm.sup.3. The dimples (5) include a plurality of kinds of dimples having different diameters.

Abstract: Disclosed is a thread wound golf ball comprising a liquid center, rubber thread layer formed on said liquid center, and a cover covering said rubber thread layer wherein said liquid center has a diameter of 29.5 to 32 mm and said cover has dimples thereon which have total dimple volume of 280 to 340 mm.sup.3.