Claims
- 1. A pneumatic radial tire having a tread provided with a central longitudinal groove on the central part thereof, side longitudinal grooves disposed on both sides of said central longitudinal groove, and lateral grooves connecting the central longitudinal groove with said side longitudinal grooves;
- said central longitudinal groove extending continuously zigzag in the circumferential direction of the tire along the equator of the tire to form a plurality of zigzag angled portions of the central longitudinal groove, each angled portion of the central longitudinal groove provided with a platform formed on only one side of the groove sidewalls at the protruding point of the zigzag angled portion, said lateral grooves connecting the other side of the groove sidewalls of the central longitudinal groove opposite said platform with said side longitudinal grooves;
- the depth of the platform from the tread surface to the platform being in a range of 40 to 80% of the depth of the central longitudinal groove;
- the circumferential length of the platform being in a range of 15 to 40% of the zigzag pitch of the central longitudinal groove; and
- the width of the platform being in a range of 5 to 20% of the width of the central longitudinal groove.
- 2. The tire of claim 1, wherein the central longitudinal groove and the side longitudinal grooves extend in the circumferential direction of the tire.
Priority Claims (1)
Number |
Date |
Country |
Kind |
60-201401 |
Sep 1985 |
JPX |
|
Parent Case Info
This application is a continuation-in-part of application Ser. No. 905,153 filed on Sept. 9, 1986, now abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3095024 |
Robertson |
Jun 1963 |
|
4423760 |
Treues et al. |
Jan 1984 |
|
4649975 |
Kogure et al. |
Mar 1985 |
|
4703788 |
Kusube et al. |
Nov 1987 |
|
Foreign Referenced Citations (3)
Number |
Date |
Country |
227322 |
Jul 1987 |
EPX |
92904 |
May 1985 |
JPX |
61807 |
Mar 1987 |
JPX |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
905153 |
Sep 1986 |
|