Bridgestone Corporation

Mitsunori Wada

Kazuto Fujita

Hikaru Tansei

Yoichi Honbo

Masahiro Takayama

Shungo Ito

Takayuki Kojio

Takayuki c/o Bridgestone Corporation Kojio

A tire, for example, is nipped by a pair of bead portion support members and filled with an internal pressure. Logo marks printed on a transfer film are positioned in front of the tire at a transfer position at which the logo marks are to be transferred or printed to the tire. The transfer film is pressed by thermal plates onto the side portions of the tire so that the logo marks are transferred onto the side portions thereof. In short, the present invention provides a printing device and a printing method capable of effectively printing clear indications on the side portions of a toroidal-shaped body such as a tire.

Heat transfer printing device and method for printing on toroidal-shaped bodies

A pneumatic tire having an improved uniformity at tire-wheel assembled state includes a pair of bead portions each closely fitted to a slant bead seat of a standard rim when the tire is mounted on the standard rim, the standard rim including for each bead portion, a rounded concave corner portion smoothly connected to the corresponding slant bead seat and a flange protrusively extending outward from the corresponding rounded concave corner portion and having a curved portion. In this tire, each bead portion has an expanded heel bringing about close fitting to the corresponding rounded concave corner portion prior to a contact between the corresponding curved portion and the corresponding bead portion.

Pneumatic tires having improved uniformity at tire-wheel assembled state

In a rim-fitted tire, a plurality of static unbalance correction weights are fixed in such a manner as to be distributed on both sides of a reference plane substantially perpendicular to the axial direction of a rim, and a plurality of dynamic unbalance correction weights, corresponding to amounts of correction of dynamic unbalance obtained with the static unbalance correction weights fixed, are fixed, thereby correcting weight unbalance.

Rim-fitted tire and method of correcting weight unbalance thereof

A core assembly for a pneumatic tire, which is fitted annularly to an outer peripheral surface of a well portion of a rim, and which rotates should the pneumatic tire collapse owing to a decline in its internal pressure, as an outer surface of the core assembly comes into contact with an inner peripheral surface of a crown portion of the pneumatic tire and an inner peripheral surface of the core assembly slides over the outer peripheral surface of the well portion of the rim. The core assembly includes a sliding portion formed of a resin material having good sliding properties and high heat resistance, and a main body to which the sliding member is secured and which is formed of a material having a high rigidity and a low specific gravity. Accordingly, since the surface of the core assembly contacting the rim is constituted by the sliding member, the core assembly is rotated smoothly when the internal pressure of the pneumatic tire declines, and the overal weight of the core assembly is reduced.

Core assembly for pneumatic tire

At lest a portion of a core assembly for a pneumatic tire, which is mounted on an outer surface of a well portion of an annular rim to which the pneumatic tire is attached, is formed from an elastomer material. The radial height of the core assembly in a condition where an inner surface of a crown portion of the tire is in contact with an outer peripheral surface of the core assembly is set in a range of from 40% to 70% of the normal height of the tire, and the width of the outer peripheral surface of the core assembly is set at 0.5 or more times the radial height of the core assembly.

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Kodaira, Japan

Mitsunori Wada