Abstract: A system for detecting deflated tires by making a relative comparison among rotation speeds of tires attached to a vehicle. The system includes a rotation speed information detection means for detecting rotation speed information of the tires; a rotation speed calculation means for calculating rotation speeds of the tires; and a determination means for determining deflated tires by comparing a decreased pressure determination value using the calculated rotation speeds with a predetermined threshold value. The determination means determines that the vehicle is going straight when it is found, with regard to factors composed of a lateral G, a yaw rate, and a steering angle of the vehicle, at least two of the factors including the yaw rate show that a difference between the maximum value and the minimum value at a predetermined time is lower than a predetermined value, thereby detecting deflated tires.

Abstract: An apparatus for detecting a decrease in tire pressure based on a resonance frequency of a tire installed in a vehicle includes rotation information detection means for detecting rotation information of the tire, resonance frequency estimate means for estimating the resonance frequency of the tire from the rotation information of the tire, and judgment means for judging the decrease in the tire pressure by comparison between the resonance frequency estimated by the resonance frequency estimate means and a reference frequency preliminarily determined by learning at the time of initialization. An effective speed region when the reference frequency is determined at the time of the initialization is a first speed or less. The apparatus further includes effective speed region change means for extending an upper limit of the effective speed region to a second speed which is larger than the first speed at the time of shifting.

Abstract: A wrong operation detection device is disclosed for monitoring whether or not a calibration start for determining an initial deflation index is issued in a tire pressure unadjusted state after a deflation warning in a tire pressure monitoring system for detection of deflation of a tire. The device includes comparison means for comparing a first deflation index serving as a deflation index at any time point in a period from issue of the deflation warning to vehicle stop after the issue of the warning, with a second deflation index serving as a deflation index obtained after the calibration start; detection means for detection of wrong operation of a reset button based on a comparison result by the comparison means; and warning means for issuing a warning when the detection means detects the wrong operation.

Abstract: A system detects deflated tires based on a resonance frequency of tires with a vehicle and a relative comparison value of rotation speeds of the tires. The system includes: a rotation information detection means for detecting rotation information of the tires; a rotation speed calculation means for calculating rotation speeds of the tires; a resonance frequency assumption means for assuming a resonance frequency of the tires; and a determination means for detection of deflated tires using a decreased pressure determination index calculated by a relative comparison of the rotation speeds of the tires and the resonance frequency. The determination means is so configured as to reduce the second threshold to be compared with the decreased pressure determination index to a value equal to or higher than 1% and equal to or lower than 90% and to detect deflated tires when the decreased pressure determination index exceeds the reduced threshold.

Abstract: An apparatus for detecting a decrease in tire pressure based on a resonance frequency of a tire installed in a vehicle includes rotation information detection means for detecting rotation information of the tire, resonance frequency estimate means for estimating the resonance frequency of the tire from the rotation information of the tire, and judgment means for judging the decrease in the tire pressure by comparison between the resonance frequency estimated by the resonance frequency estimate means and a reference frequency preliminarily determined by learning at the time of initialization. An effective speed region when the reference frequency is determined at the time of the initialization is a first speed or less. The apparatus further includes effective speed region change means for extending an upper limit of the effective speed region to a second speed which is larger than the first speed at the time of shifting.

Abstract: A wrong operation detection device is disclosed for monitoring whether or not a calibration start for determining an initial deflation index is issued in a tire pressure unadjusted state after a deflation warning in a tire pressure monitoring system for detection of deflation of a tire. The device includes comparison means for comparing a first deflation index serving as a deflation index at any time point in a period from issue of the deflation warning to vehicle stop after the issue of the warning, with a second deflation index serving as a deflation index obtained after the calibration start; detection means for detection of wrong operation of a reset button based on a comparison result by the comparison means; and warning means for issuing a warning when the detection means detects the wrong operation.

Abstract: A system detects deflated tires based on a resonance frequency of tires with a vehicle and a relative comparison value of rotation speeds of the tires. The system includes: a rotation information detection means for detecting rotation information of the tires; a rotation speed calculation means for calculating rotation speeds of the tires; a resonance frequency assumption means for assuming a resonance frequency of the tires; and a determination means for detection of deflated tires using a decreased pressure determination index calculated by a relative comparison of the rotation speeds of the tires and the resonance frequency. The determination means is so configured as to reduce the second threshold to be compared with the decreased pressure determination index to a value equal to or higher than 1% and equal to or lower than 90% and to detect deflated tires when the decreased pressure determination index exceeds the reduced threshold.

Abstract: A system for detecting deflated tires by making a relative comparison among rotation speeds of tires attached to a vehicle. The system includes a rotation speed information detection means for detecting rotation speed information of the tires; a rotation speed calculation means for calculating rotation speeds of the tires; and a determination means for determining deflated tires by comparing a decreased pressure determination value using the calculated rotation speeds with a predetermined threshold value. The determination means determines that the vehicle is going straight when it is found, with regard to factors composed of a lateral G, a yaw rate, and a steering angle of the vehicle, at least two of the factors including the yaw rate show that a difference between the maximum value and the minimum value at a predetermined time is lower than a predetermined value, thereby detecting deflated tires.

Abstract: The present invention provides a solid golf ball having exceptional rebound characteristics and flight performance, as well as good shot feel. The present invention relates to a solid golf ball comprising at least one layer of a core, and at least one layer of a cover formed on the core, wherein at least one of the layers of the core is formed by vulcanizing and press-molding a rubber composition having (a) a base rubber comprising polybutadiene rubber containing a cis-1,4-bond of not less than 80% in microstructure and having a molecular weight distribution (Mw/Mn) of 1.2 to 2.0, (b) a co-crosslinking agent, and (c) an organic peroxide.

Abstract: The present invention provides a solid golf ball which gives a superior shot feeling to the golfer and exhibits stabilized repulsion performance when it is hit at any head speed. The solid golf ball of the present invention comprises a core containing at least one layer which is molded by vulcanizing the rubber composition including: (a) a base rubber, (b) a co-crosslinking agent, (c) an organic peroxide, and (d) a polysulfide compound represented by the formula: wherein at least one of R1 to R5 and at least one of R6 to R10 are each Br, and n is an integer not less than 2.

Abstract: A solid golf ball having a polyurethane cover and containing satisfactory formability and ball properties. The golf ball provides good shot feel, controllability, and resilience by adjusting the hardness and the thickness of the polyurethane cover, and the hardness of the entire golf bal. The formability of the polyurethane cover is improved by controlling the amount of residual isocyanate monomer contained in the isocyanate group-terminated urethane prepolymer.

Abstract: A shoe body for a left foot which includes an outsole body, double-side-slip-preventing projections and additional projections formed on a bottom surface of the outsole body, the outsole body, the double-side-slip-preventing projections and the additional projections being formed integrally and having a composition containing rubber or synthetic resin as a principal component. Each of the double-side-slip-preventing projections includes a bottom surface to be a grounding surface, a tiptoe side slip prevention wall, and a heel side slip prevention wall. The tiptoe side slip prevention wall is formed substantially along a line to be convex in a tiptoe direction and the heel side slip prevention wall is formed substantially along a line to be convex in a heel direction.

Abstract: The present invention provides a solid golf ball which imparts a superior shot feeling to the golfer and exhibits stabilized repulsion performance when it is hit at any head speed. The solid golf ball of the present invention comprises a core containing at least one layer which is molded by vulcanizing the rubber composition including: (a) a base rubber, (b) a co-crosslinking agent, (c) an organic peroxide, and (d) a bromine-substituted thiophenol compound represented by the formula, or a monovalent or divalent metal salt thereof: (wherein at least one of R1 to R5 is Br).

Abstract: The present invention provides a solid golf ball having exceptional rebound characteristics and flight performance, as well as good shot feel. The present invention relates to a solid golf ball comprising at least one layer of a core, and at least one layer of a cover formed on the core, wherein at least one of the layers of the core is formed by vulcanizing and press-molding a rubber composition comprising (a) a base rubber comprising polybutadiene rubber containing a cis-1,4-bond of not less than 99%, (b) a co-crosslinking agent, and (c) an organic peroxide.

Abstract: A shoe body (L) for a left foot comprises an outsole body (1). Double-side-slip-preventing projections (3a) and (3b) and another projection (5) are formed on a bottom surface of the outsole body (1). The outsole body (1), the double-side-slip-preventing projections (3a) and (3b) and another projection (5) are formed integrally by a composition containing rubber or synthetic resin as a principal component. Each of the double-side-slip-preventing projections (3a) and (3b) includes a bottom surface to be a grounding surface, a tiptoe side slip prevention wall, and a heel side slip prevention wall. The tiptoe side slip prevention wall is formed substantially along a line to be convex in a tiptoe direction. The heel side slip prevention wall is formed substantially along a line to be convex in a heel direction.

Abstract: A shoe (L) for a left foot includes an outsole body (1). Both side slip prevention projections (3a) and (3b) and a non-both side slip prevention projection (5) are formed on a bottom surface of the outsole body (1). The outsole body (1), the both side slip prevention projections (3a) and (3b) and the non-both side slip prevention projection (5) are integrally formed of a composition containing rubber or synthetic resin as a principal component. Each of the both side slip prevention projections (3a) and (3b) has a bottom surface to be a grounding surface, a toe side slip prevention wall and a heel side slip prevention wall. The toe side slip prevention wall is formed along a convex line in a direction of a toe. The heel side slip prevention wall is formed along a convex line in a direction of a heel. A shoe (R) for a right foot has a shape obtained by transversely inverting the shape of the shoe (L) for the left foot.

Abstract: A golf shoe (1) comprises a sole portion (an outsole) (3) and an upper portion (5). The sole portion (3) is formed of an elastic material. The golf shoe (1) has a toe side flexibility evaluation value (Gt) of 0.0015 to 0.0100. The toe side flexibility evaluation value (Gt) is calculated by the following equation (I); Gt=(20/L)/Ft  (I) In the equation (I), L represents an overall length (mm) of the sole portion (3). Furthermore, Ft represents a tensile load (N) required for fixing a half part of the sole portion (3) close to a heel and pulling a front end close to a toe, thereby displacing the front end by 20 mm.

Abstract: The present invention provides a multi-piece solid golf ball having excellent rebound characteristics when hitting at low head speed because the rebound characteristics do not depend on the head speed at the time of hitting.

Abstract: The invention is intended to provide a solid golf ball having a polyurethane cover having satisfactory formability and ball properties. The golf ball of the present invention provides the good shot feeling, the controllability, and the resilience by adjusting the hardness and the thickness of the polyurethane cover, and the hardness of the whole golf ball. Further, the formability of the polyurethane cover has been improved by controlling the amount of residual isocyanate monomer contained in the isocyanate group-terminated urethane prepolymer.

Abstract: The present invention provides a solid golf ball having exceptional rebound characteristics and flight performance, as well as good shot feel. The present invention relates to a solid golf ball comprising at least one layer of a core, and at least one layer of a cover formed on the core, wherein at least one of the layers of the core is formed by vulcanizing and press-molding a rubber composition comprising a base rubber, co-crosslinking agent, organic peroxide, filler and specific organic sulfur compound which contains substituent groups having a substituent constant of not less than 1.42.