Abstract: A method for detecting decompression of tires based on the rotational speed of wheels mounted on a vehicle, comprising the steps of: detecting the rotational speed of each of the above-mentioned wheels, determining the speed against ground of the vehicle, calculating the speed information of a fixed wheel from the rotational speeds of said wheels, calculating the judgment value of the wheel position by comparing the speed information of the wheels with the speed against ground of the vehicle, comparing the judgment value of the wheel position with the basis value of the wheel position obtained by preliminarily comparing the speed against ground of the vehicle with the speed information of the wheels at prescribed inner pressure, and judging decompression of tires based on relation between the comparison value of the basis value with the judgment value and a fixed threshold. A region of judging decompression of tires can be broadened and the accuracy of reduced pressure judgment can be improved.
Abstract: To provide a rubber composition having excellent wet grip performance while maintaining low heat build-up characteristics without lowering processability, abrasion resistance and rolling resistance. The rubber composition of the present invention comprises, based on 100 parts by weight of a diene rubber (A), 5 to 150 parts by weight of particular inorganic filler (B), 5 to 150 parts by weight of carbon black (C) having a nitrogen adsorption specific surface area of 70 to 300 m2/g, and 1 to 20 % by weight of a silane coupling agent (D). The pneumatic tire of the present invention is obtained by using the rubber composition for the tread rubber.
Abstract: A method of manufacturing a pneumatic tire comprises assembling unvulcanized rubber components to make a green tire, vulcanizing the green tire, and winding an unvulcanized rubber tape so that the windings collectively have a predetermined cross sectional shape for at least one of the unvulcanized rubber components to thereby make said at least one of the unvulcanized rubber components.
Abstract: A wood-type golf club head containing a volume which is not less than 300 cc, including a main body and a face member disposed on the front of the main body to form a clubface. The face member is formed by (i) forging an alpha-beta-type titanium alloy at a temperature which is less than the transformation temperature to the beta phase of the alloy, and of which difference from the transformation temperature to the beta phase is not more than 100 deg.C., and (ii) subsequent cooling within a temperature range of from 0 to 100 deg.C. The face member is welded to the main body to form a junction therebetween, wherein the junction is partially or wholly shifted backwards from the edge of the clubface by at least 5 mm, and the total length of the edge of the clubface where the shift is at least 5 mm, is not less than 40% of the whole length of the edge.
Abstract: A method for detecting decrease in tire air-pressure in which decrease in internal pressure of a tire is detected on the basis of rotational information obtained from tires attached to a vehicle.
Abstract: The present invention provides a golf ball having high rebound characteristics and exceptional controllability at approach shot from the rough, which accomplished by controlling its cover material morphology. The present invention relates a golf ball comprising a core and a cover covering the core, wherein the base resin of the cover is formed from a material having at least two phases whose phase angle difference is at least 2 degrees as measured by using an atomic force microscope; a maximum phase angle phase, which is contained in the base resin of the cover and has an absolute value of a maximum phase angle, is present in the form of a continuous matrix; and a minimum phase angle phase, which has an absolute value of a minimum phase angle, is present in discrete locations within the matrix.
Abstract: In a golf club head having a face body, the face body is composed of a hybrid of an amorphous phase layer and a crystal phase layer. The crystal phase layer is disposed on a reverse face side of a face. And, thickness of the face body is 0.5 mm to 5.0 mm, thickness of the amorphous phase layer is, on average in whole area of the face body, more than 50% of the thickness of the face body, and thickness of the crystal phase layer is arranged to be 0.01 mm to 3.0 mm.
Abstract: A vehicle tire which has an aspect ratio of less than about 55% and comprises a tread portion having a profile whose radius of curvature decreases substantially continuously from the tire equator to each tread edges. The tread profile from the tire equator to each tread edge is substantially defined by a curve such as ellipse, cycloid, epicycloid, involute curves and the like, of which equation is differentiable in the range between the tire equator and each tread edge.
Abstract: A pneumatic radial tire comprises a breaker belt disposed radially outside the carcass having at least two cross plies of high elastic modulus cords laid at an inclination angle of from 15 to 30 degrees with respect to the tire equator, and a band belt disposed radially outside the breaker belt and comprising a full-width band and a pair of axially spaced edge bands, wherein the full-width band is made of low elastic modulus organic fiber cords arranged substantially parallel to the tire equator. The edge bands are made of high modulus organic fiber cords arranged substantially parallel to the tire equator, whereby the high speed durability and cornering performance are improved.
Abstract: An apparatus for alarming abnormality of tire air pressure, including: a display section capable of displaying information in a normal operation mode and information in a special operation mode; an input switch capable of entering ON/OFF information; and a non-volatile memory whose information in the special mode does not disappear even if an ignition is turned off wherein the apparatus is configured so that the special operation mode is entered by turning on the ignition while pressing the input switch, and the information in the special operation mode is displayed on the display section. The apparatus can prevent a dangerous action such that the driver reads a failure code or the position of a tire having abnormal internal air pressure while driving a vehicle.
Abstract: The outer circumferential surface of a mandrel in a bar-shaped configuration is wound with reinforced fiber impregnated with a resin. This reinforced fiber is heat-treated and hardened, to thereby form a reinforced fiber layer in a tubular configuration around the mandrel. The mandrel is provided with a reduced portion in the axial middle thereof, which is decreased in the outside diameter thereof. This mandrel comprises a basic end side member and a terminal end side member which are both connected such that they can be separated at the reduced portion. The separation of both component members of the mandrel is conducted axially in opposite directions, and this allows the detachment of the mandrel out of the reinforced fiber layer.
Abstract: A material of which a golf club head or a prototype thereof is made is held such that it is pivoted and indexed about a single axis of a holding installation. This material is cut in a predetermined outer surface configuration of a golf club head by means of a cutter means while the material is rotated about said axis, and is successively brought to a standstill at predetermined angles, or while the material is continuously rotated.
Abstract: A pneumatic radial tire has a tread surface extending along a specific curvature plane which includes a first arc with the radius R1 having a center on the tire's equatorial plane and passing through the tire's equatorial point, a second arc with the radius R2 having a center on the tire's equatorial plane and intersecting with the first arc at an intersection distant from the tire's equatorial plane by 0.2 to 0.25 times the tire width SW, and a third arc with the radius R3 passing through a ground contact outer edge point of the ground contact surface, when a standard load is applied, and a belt intermediate height point on the tread surface. In the specific curvature plane, the curvature radius ratio R2/R3 is set in a range from 4 to 12, and the curvature radius ratio R1/R2 is set in a range from 2.6 to 4.6 when the aspect ratio H/SW is 0.55 or less. The tread surface is provided with a main circumferential groove, preferably having a groove width of 0.06 to 0.
Abstract: In a golf ball having dimples and lands other than the dimples formed on the surface thereof, dimples are arranged so that less than 40 lands are provided which contain a rectangle having a short side greater than 0.4 mm and an area greater than 0.8 mm.sup.2 and not including a part of the dimple or the whole thereof. A land having the greatest area of all lands is so small that a dimple having an area greater than the average area of all dimples cannot be formed therein.
Abstract: A method and an apparatus for compensating a radial deflection and/or a lateral deflection in tire grooving wherein a cutter movement is controlled by a plurality of operating shafts and a desired pattern grooves are formed in a tire surface, wherein the radial deflection in a direction along diameter of the tire, which is supported by a tire supporting shaft, and/or the lateral deflection in a direction along diameter of the tire are detected before or during tire grooving, an a radially driving member, which moves a cutter in a direction along diameter of the tire, and/or a laterally driving member, which moves a cutter in a direction along width of the tire, are actuated in accordance with a reference program, and concurrently a movement of the radially driving member and/or a movement of the laterally driving member are adjusted in accordance with a correction program based on the detected deflection value in order to follow the radial deflection and/or the lateral deflection.
Abstract: An apparatus for grooving a tire which comprises a tire support shaft for rotatably supporting the tire and a support frame having a cutter device mounted thereon. The cutter device and the tire support shaft are movable relative to each other in a transverse direction parallel with the tire support shaft and perpendicular to the tire support shaft. The cutter is supportable at a desired angle with the tread surface, and the cutter blade is rotatable in the direction of the groove to be formed. The cutting position of the cutter is on the axis of an arm support shaft and is controllable by the combination of orthogonal coordinates to simplify the control program for the apparatus. When required, the cutter is swingably attached to a cutter holder to enable the cutter to cut the tire rubber and to be released therefrom with ease without the need to heat the cutter.
Abstract: A set of golf clubs each having a fiber reinforced plastic shaft incorporating helically wound reinforcing filaments over the entire length thereof, the shaft comprising an intermediate flex section interposed between a head-side section and a grip-side section, a filament winding angle in the flex section being larger than that in the head-side and grip-side sections so that a maximum bendability is provided at the flex section, wherein location of the flex section gradually differs from club to club in the set in order of club number in a manner that any club of smaller number in the set has its flex section closer to its club head than any club of greater number in the set.
Abstract: An object of the present invention is to obtain a tennis ball and a core for tennis ball which keeps high values within the ITF standard and besides has excellent durability.That is, the present invention provides a core for tennis ball obtained by vulcanizing a rubber composition containing, in its whole rubber component, 5 to 40 weight % of a 1,2-bond containing polybutadiene and 60 to 95 weight % of a natural rubber and/or high cis-polybutadiene containing not less than 90% of a cis 1,4-bond, and tennis balls obtained therefrom.