Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Reexamination Certificate
2011-03-22
2011-03-22
Fischer, Justin (Department: 1747)
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
C152S541000, C152S542000, C152S546000, C152S547000, C152S555000
Reexamination Certificate
active
07909077
ABSTRACT:
A heavy duty tire comprises a bead filler disposed in each bead portion (4). The bead filler (8) comprises: a main layer (13) having a complex elastic modulus E*2of from 2.0 to 6.0 Mpa; and a fastening layer (12) having a complex elastic modulus E*1of from 20 to 70 Mpa. The fastening layer comprises a base portion (12B) and an axially inner portion (12A) to have a L-shaped cross section. The height Ha of the axially inner portion (12A) is 35 to 100 mm and not more than the height Hb of the main layer (13), and the radial height Hb is 40 to 100 mm, each from the bead base line. The thickness of the axially inner portion (12A) gradually decreases towards the radially outside so that, when measured along a straight line X1drawn perpendicularly to the axially outer surface of the bead filler from a point P1thereon at a distance of 25 mm radially outward from the bead base line: the thickness Tb from the axially outer surface of the bead filler to the interface between the axially inner portion (12A) and the main layer is 7.0 to 13.0 mm; the thickness Ta from the interface to the axially inner surface of the axially inner portion (12A) is 1.0 to 4.0 mm; and the ratio Ta/Tb is 0.1 to 0.35.
REFERENCES:
patent: 4721144 (1988-01-01), Hara et al.
patent: 2-133208 (1990-05-01), None
patent: 2002-205508 (2002-07-01), None
Birch & Stewart Kolasch & Birch, LLP
Fischer Justin
Sumitomo Rubber Industries Ltd.
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