Sumitomo Rubber Industries Patente

A tire includes a tread portion 2 having a designated rotation direction R. The tread portion 2 includes a first tread end T1, a first middle position 10, and first inclined grooves 5. An inner end 5i of each first inclined groove 5 in a tire axial direction is located on a tire equator C side with respect to the first middle position 10. In each first inclined groove 5, an angle relative to a tire circumferential direction at the inner end 5i is smaller than that at the first middle position 10. Each first inclined groove 5 includes a first groove wall 11 on a leading edge side and a second groove wall 12. In an inner region 5A of each first inclined groove 5, the second groove wall 12 includes a chamfered portion 15. In a cross-section orthogonal to a groove center line of the first inclined groove 5, a chamfered area of the chamfered portion 15 increases toward the inner end 5i side.

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The present invention is a puncture repair kit (1) for repairing a puncture of an object. The puncture repair kit (1) includes a container (5) containing a puncture repair liquid (R), a compressed air source (3) for supplying compressed air (A), a mixing device (4) attached to the container (5) and for generating a mixture of the puncture repair liquid (R) and the compressed air (A), a first connector (12) connecting the compressed air source (3) and the mixing device (4), and a second connector (13) connecting the mixing device (4) and a valve of the punctured object. A radiation angle θ of the mixture that is non-aerosolized and non-foamed and discharged from the valve into an interior of the object is 20 degrees or more.

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An object of the present disclosure is to provide a golf ball having an increased spin rate when being hit with an 8-iron while suppressing rise in a spin rate when being hit with a driver. The present disclosure provides a golf ball comprising a spherical core having an inner core and an outer core, and a cover positioned outside the spherical core, wherein A×a is 12,200 or less and B×b is 20,400 or more, where "a" represents an average hardness (Shore C) of a hardness (H2.5) at a point of 2.5 mm from a center of the spherical core and a hardness (H5) at a point of 5 mm from the center of the spherical core, "b" represents an average hardness (Shore C) of a hardness (H7.5) at a point of 7.5 mm from the center of the spherical core and a hardness (H9) at a point of 9 mm from the center of the spherical core, "A" represents an impulse difference (kN·µs) between a back spin impulse and a top spin impulse measured using a contact force tester under a condition corresponding to a condition when the golf ball is hit with a driver, and "B" represents an impulse difference (kN·µs) between a back spin impulse and a top spin impulse measured using a contact force tester under a condition corresponding to a condition when the golf ball is hit with an 8-iron.

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An outer surface 2G of a tire 2 includes a tread surface 22 and a pair of side surfaces 26. A position, on the tread surface 22, at which a distance in an axial direction from an equator plane is 60% of a distance in the axial direction from the equator plane to a reference ground-contact position PH, is a tilt confirmation position P60. An angle of a tangent line that is tangent to a contour line of the tread surface 22 at the tilt confirmation position P60 with respect to the axial direction in a meridian cross-section is not less than 2.5 degrees and not greater than 3.5 degrees. A ratio of an equator ground-contact length measured along the equator plane to a reference ground-contact length at a position corresponding to a width of 60% of a ground-contact width of a ground-contact surface, on the ground-contact surface, is a shape index F60, and the shape index F60 is not less than 1.00 and not greater than 1.20.

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Provided is a tire with excellent handling stability during high-speed driving. A tire includes a belt layer (16) and a tread portion (4), the belt layer including at least one belt ply (38, 40) including a steel monofilament and a coating rubber, the belt layer having a ratio of E2/E1 of less than 0.90, wherein, when viewed in a radial cross-section of the tire, E1 denotes the number (ends/50 mm) of steel monofilaments aligned per 50 mm in the tire width direction in a region of the belt ply having the largest width in the tire axial direction which extends from the tire equator to a point Q that is located at 80% of a distance L in the tire axial direction from the tire equator to a point P that is located at an outer edge, with respect to the tire width direction, of the belt ply having the largest width in the tire axial direction; and E2 denotes the number (ends/50 mm) of steel monofilaments aligned per 50 mm in the tire width direction in a region of the belt ply having the largest width in the tire axial direction which extends from the point Q to the point P, the tread portion having a loss tangent, tanδt, of 0.25 or less as measured at a temperature of 30°C, an initial strain of 10%, a dynamic strain of ± 1%, and a frequency of 10 Hz in extension mode.

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A tire 2 includes a tread 4 including a cap layer 46, a base layer 50, and an intermediate layer 48. A loss tangent at 30°C of the intermediate layer 48 is lower than that of the cap layer 46. A loss tangent at 30°C of the base layer 50 is lower than that of the intermediate layer 48. A boundary, between a shoulder arc and a corner arc, included in a contour line of a tread surface 24 is a reference boundary point. The reference boundary point is located axially outward of a reference ground-contact position of the tire 2. When a shoulder land portion 32s is divided into axially inner and outer portions by a ground-contact reference line LG passing through the reference ground-contact position, a thickness ratio of the intermediate layer 48 at the axially outer portion is higher than that at the axially inner portion.

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A grommet of a racket includes a tubular part. The tubular part includes a through hole through which a string is passed. The through hole includes a base opening, a side wall, and a non-circular tip opening. Assuming an imaginary dividing plane that is perpendicular to a face of the racket and that divides the non-circular tip opening into a first opening portion and a second opening portion shorter than the first opening portion in a direction parallel to the face, an inside dimension of the first opening portion in the direction perpendicular to the face increases gradually from one end of the non-circular tip opening in the direction parallel to the face to the dividing plane. In the tubular part, the string passes through the first opening portion and is in contact with the side wall from the base opening to the tip opening.