Abstract: An aqueous adhesive for rubber includes rubber latex and an ammonium-salt-based vulcanization acceleration aid. An amount of the ammonium-salt-based vulcanization acceleration aid contained in the aqueous adhesive is preferably not less than 0.01% by weight and not greater than 5.0% by weight in terms of solid content. An aqueous adhesive for a ball includes rubber latex as a main component. A content of an inorganic filler in the aqueous adhesive is not greater than 0.1% by weight in terms of solid content. A ball 2 includes a hollow core 4 obtained by crosslinking a rubber composition that contains a vulcanizing agent. The core 4 is formed of two hemispherical half cores. The two half cores are adhered to each other by using the aqueous adhesive for a ball.

Abstract: A rubber composition for a hollow ball includes a base rubber and an inorganic filler. A weight reduction rate TGA650 from room temperature to 650° C. and a weight reduction rate TGA850 from room temperature to 850° C. of the rubber composition are measured under an air atmosphere by thermogravimetry conforming to JIS K0129. The weight reduction rate TGA650 of the rubber composition is not less than 63% and not greater than 99%. A difference (TGA850?TGA650) between the weight reduction rates TGA850 and TGA650 of the rubber composition is not less than 0% and not greater than 7%. A hollow ball 2 includes a hollow core 4 formed from the rubber composition.

Abstract: A rubber composition for a tennis ball includes a base rubber and a filler having a degree of flatness DL of not less than 50, the degree of flatness DL being obtained by dividing an average particle diameter D50 (?m) of the filler by an average thickness T (?m) of the filler. An amount of the filler per 100 parts by weight of the base rubber is not less than 1 part by weight and not greater than 150 parts by weight. A gas permeability coefficient GPS and a loss tangent tan ?S of the rubber composition and a gas permeability coefficient GPL and a loss tangent tan ?L of a rubber composition obtained by replacing the filler with kaolin clay having a degree of flatness DL of 20 satisfy (1): GPL/GPS?1.02 and (2): |tan ?L?tan ?S|?0.03. A tennis ball 2 includes a core 4 formed using the rubber composition.

Abstract: An aqueous adhesive for rubber includes rubber latex and an ammonium-salt-based vulcanization acceleration aid. An amount of the ammonium-salt-based vulcanization acceleration aid contained in the aqueous adhesive is preferably not less than 0.01% by weight and not greater than 5.0% by weight in terms of solid content. An aqueous adhesive for a ball includes rubber latex as a main component. A content of an inorganic filler in the aqueous adhesive is not greater than 0.1% by weight in terms of solid content. A ball 2 includes a hollow core 4 obtained by crosslinking a rubber composition that contains a vulcanizing agent. The core 4 is formed of two hemispherical half cores. The two half cores are adhered to each other by using the aqueous adhesive for a ball.

Abstract: A tennis racket includes throats. Each throat includes a fiber reinforced layer and a vibration damper. The vibration damper is surrounded by the fiber reinforced layer. The fiber reinforced layer includes a plurality of reinforcement fibers and a matrix. The reinforcement fibers are typically carbon fibers. The material of the matrix is a resin composition whose base material is an epoxy resin. The vibration damper is formed of a polymer composition. The polymer composition contains a base polymer. The base polymer is preferably a styrene-isoprene-styrene block copolymer or an acrylic elastomer.

Abstract: A first protrusion protruding from an upper lighting cover is fitted into a first installing portion provided in a cover and a second protrusion protruding from the upper lighting cover is inserted into a first hole provided in the cover. In a case where disassembly is performed from this state, disassembly can be accomplished by breaking a first breaking portion provided around the first installing portion. In a case where reassembly is performed from this state, the second protrusion protruding from the upper lighting cover is fitted into a second installing portion provided in the cover.

Abstract: A rubber composition for a tennis ball includes a base rubber and a high-flatness filler. The high-flatness filler has an average particle diameter D50 of not less than 1 ?m and not greater than 50 ?m. A degree of flatness DL is not less than 40 and not greater than 200. An amount of the high-flatness filler per 100 parts by weight of the base rubber is not less than 5 parts by weight and not greater than 100 parts by weight. A ratio (E2/E1) of a tensile elastic modulus E2 in a tensile strain range from 70% to 100% to a tensile elastic modulus E1 in a tensile strain range from 10% to 30%, of a vulcanized rubber obtained by vulcanizing the rubber composition, is not less than 0.60 and less than 1.00. The tennis ball includes a hollow core formed from the rubber composition.

Abstract: A first protrusion protruding from an upper lighting cover is fitted into a first installing portion provided in a cover and a second protrusion protruding from the upper lighting cover is inserted into a first hole provided in the cover. In a case where disassembly is performed from this state, disassembly can be accomplished by breaking a first breaking portion provided around the first installing portion. In a case where reassembly is performed from this state, the second protrusion protruding from the upper lighting cover is fitted into a second installing portion provided in the cover.

Abstract: A rubber composition for a hollow ball includes a base rubber, an inorganic filler composed of a large number of flat particles, and a carbon-based filler. As to the carbon-based filler, a degree of flatness DLc obtained by dividing an average particle diameter D50c (?m) by an average thickness Tc (?m) is not less than 50. A weight ratio Mc/Mi is not less than 0.01 and not greater than 1.00. The rubber composition is obtained by a production method including: a first step of mixing the base rubber and the carbon-based filler to obtain a master batch; and a second step of adding the large number of flat particles that form the inorganic filler, to the master batch to orient the large number of flat particles. The hollow ball 2 includes a core 4 formed from the rubber composition.

Abstract: A ceiling fan includes a support rod that is capable of engaging with a ceiling, a motor that is provided at a lower portion of the support rod, blades (5) that are detachably attached to the motor, and lighting unit (7) that is provided at a lower portion of the motor. Lighting unit (7) includes upper lighting cover (16), lower lighting cover (17) that covers an area below upper lighting cover (16), board (19) which is disposed between lower lighting cover (17) and upper lighting cover (16), and on which a light-emitting component is installed, and heat-dissipating unit (18) that is provided between board (19) and upper lighting cover (16), and dissipates heat from board (19). Upper lighting cover (16) and lower lighting cover (17) are formed of a resin, and opening (31) for dissipating heat is provided at a center portion of upper lighting cover (16).

Abstract: In a tennis racket, longitudinal strings extending in a longitudinal direction and transverse strings extending in a transverse direction intersect each other to form a plurality of meshes. At a center, in the transverse direction, of a head, a ratio of an area St of a tip mesh located closest to a tip in the longitudinal direction relative to an area Sc of a center mesh located at a center in the longitudinal direction is not less than. The center mesh is formed in a rectangular shape having short sides in the longitudinal direction and long sides in the transverse direction. Preferably, from the center mesh to the tip mesh, an area of each mesh is set so as to be not larger than an area of a mesh adjacent thereto at a tip side.

Abstract: A rubber composition for a tennis ball includes a base rubber and a high-flatness filler. The high-flatness filler has an average particle diameter D50 of not less than 1 ?m and not greater than 50 ?m. A degree of flatness DL is not less than 40 and not greater than 200. An amount of the high-flatness filler per 100 parts by weight of the base rubber is not less than 5 parts by weight and not greater than 100 parts by weight. A ratio (E2/E1) of a tensile elastic modulus E2 in a tensile strain range from 70% to 100% to a tensile elastic modulus E1 in a tensile strain range from 10% to 30%, of a vulcanized rubber obtained by vulcanizing the rubber composition, is not less than 0.60 and less than 1.00. The tennis ball includes a hollow core formed from the rubber composition.

Abstract: A rubber composition for a tennis ball includes a base rubber and a filler having a degree of flatness DL of not less than 50, the degree of flatness DL being obtained by dividing an average particle diameter D50 (?m) of the filler by an average thickness T (?m) of the filler. An amount of the filler per 100 parts by weight of the base rubber is not less than 1 part by weight and not greater than 150 parts by weight. A gas permeability coefficient GPS and a loss tangent tan ?S of the rubber composition and a gas permeability coefficient GPL and a loss tangent tan ?L of a rubber composition obtained by replacing the filler with kaolin clay having a degree of flatness DL of 20 satisfy (1): GPL/GPS?1.02 and (2): |tan ?L?tan ?S|?0.03. A tennis ball 2 includes a core 4 formed using the rubber composition.

Abstract: An aqueous adhesive for a tennis ball includes rubber latex and a sulfenamide-based vulcanization accelerator. When a solid content in the aqueous adhesive is measured at a temperature of 150° C. by a curelastometer, a 10% torque time t10 is preferably not shorter than 3 minutes and preferably not longer than 15 minutes, and a ratio (t10/t90) of the 10% torque time t10 to a 90% torque time t90 is preferably not less than 0.60 and preferably not greater than 0.95. A tennis ball includes a hollow core obtained by two semi-spherical half cores being adhered by using the aqueous adhesive.

Abstract: In a tennis racket, longitudinal strings extending in a longitudinal direction and transverse strings extending in a transverse direction intersect each other to form a plurality of meshes. At a center, in the transverse direction, of a head, a ratio of an area St of a tip mesh located closest to a tip in the longitudinal direction relative to an area Sc of a center mesh located at a center in the longitudinal direction is not less than. The center mesh is formed in a rectangular shape having short sides in the longitudinal direction and long sides in the transverse direction. Preferably, from the center mesh to the tip mesh, an area of each mesh is set so as to be not larger than an area of a mesh adjacent thereto at a tip side.

Abstract: A rubber composition for a hollow ball includes a base rubber, an inorganic filler composed of a large number of flat particles, and a carbon-based filler. As to the carbon-based filler, a degree of flatness DLc obtained by dividing an average particle diameter D50c (?m) by an average thickness Tc (?m) is not less than 50. A weight ratio Mc/Mi is not less than 0.01 and not greater than 1.00. The rubber composition is obtained by a production method including: a first step of mixing the base rubber and the carbon-based filler to obtain a master batch; and a second step of adding the large number of flat particles that form the inorganic filler, to the master batch to orient the large number of flat particles. The hollow ball 2 includes a core 4 formed from the rubber composition.

Abstract: A rubber composition for a hollow ball includes a base rubber and an inorganic filler. A weight reduction rate TGA650 from room temperature to 650° C. and a weight reduction rate TGA850 from room temperature to 850° C. of the rubber composition are measured under an air atmosphere by thermogravimetry conforming to JIS K0129. The weight reduction rate TGA650 of the rubber composition is not less than 63% and not greater than 99%. A difference (TGA850?TGA650) between the weight reduction rates TGA850 and TGA650 of the rubber composition is not less than 0% and not greater than 7%. A hollow ball 2 includes a hollow core 4 formed from the rubber composition.