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US 4,723,584 AGranted
Pneumatic tires having excellent traction and braking performances
AssigneeBridgestone Corporation
InventorsKojiro Yamaguchi, Makoto Yamauchi
Life of this patent
Estimating the term…
Abstract
A pneumatic tire having excellent traction and braking performances is disclosed, which comprises a tread divided into island portions inclusive of at least one block row group by plural circumferential grooves and plural transverse grooves, and having plural sipes. In this type of the tire, the sipe is provided at its cut end with an escape hole having a size larger than that of the sipe.
Claims9
A pneumatic tire having excellent traction and braking performances, comprising;
- a tread divided into island portions inclusive of at least one block row group by plural circumferential main grooves extending circumferentially of the tread and plural transverse grooves crossing with the circumferential main grooves and extending toward the widthwise direction of the tread, blocks in said block row having plural lateral sipes therein, each of said sipes having a width of about 0.5 mm to close opposed wall faces of the sipe with each other at a ground contact surface during running under a load and being cut from one of the circumferential main grooves to the island portion at a depth substantially equal to or less than that of the circumferential main grooves;
- said sipes having at a cut end an escape hole having a size of not less than 2.5 times the width of the sipe.
Dependencies are inferred from the claim text.