Pneumatic tire with tread having zigzag sipes

Details Pneumatic tire with tread having zigzag sipes Pneumatic tire with tread having zigzag sipes

2004-12-08

2009-02-10

Maki, Steven D (Department: 1791)

Resilient tires and wheels

Tires, resilient

Anti-skid devices

C152S209230, C152SDIG020, C152S902000

Reexamination Certificate

active

07487810

ABSTRACT:
A pneumatic tire comprising a tread portion having tread elements each provided with a sipe, wherein the sipe is open to a upper surface of the tread element, and has an open top end including a zigzag part and a bottom, wherein the sipe comprises: a first portion in which the zigzag part of the open top end extends to a side of the bottom in a state of being inclined to one side of a longitudinal direction of the sipe; a second portion connected to an inner side in a radial direction of the first portion, and in which the zigzag part extends to the side of the bottom in a state of being inclined in an opposite direction to the first portion; and a third portion connected to an inner side in a radial direction of the second portion, and in which the zigzag part extends to the side of the bottom in a state of being inclined in an opposite direction to the second portion, and the sipe satisfies the following relation (1):in-line-formulae description="In-line Formulae" end="lead"?α1>α2>α3  (1)in-line-formulae description="In-line Formulae" end="tail"?where α1is a ratio (a1/h1) between a displacement length a1of the first portion and a length h1in a radial direction of the first portion, α2is a ratio (a2/h2) between a displacement length a2of the second portion direction and a length h2in a radial direction of the second portion, and α3is a ratio (a3/h3) between a displacement length a3of the third portion and a length h3in a radial direction of the third portion.

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