Resilient tires and wheels – Tires – resilient – Anti-skid devices
Patent
1997-09-16
1999-06-08
Maki, Steven D.
Resilient tires and wheels
Tires, resilient
Anti-skid devices
152DIG3, B60C 1111, B60C 1112, B60C 1113
Patent
active
059097566
ABSTRACT:
A pneumatic tire comprises a tread portion divided into at least three land portions by at least two circumferential main grooves, and at least one of the three land portions is provided with sub-grooves being shallower in depth than the main grooves and having a width in the range of from 0.05 to 0.60 times the width of the main grooves. The sub-grooves comprises axial sub-grooves extending across the land portion and a circumferential sub-groove extending continuously in the circumferential direction of the tire. The circumferential sub-groove is provided in the bottom with a circumferential sipe extending continuously in the circumferential direction of the tire. Each of the axial sub-grooves is provided in the groove bottom on each side of the circumferential sub-groove with an axial sipe extending along the longitudinal direction thereof. The axial sipe has a first end on the circumferential sub-groove side and a second end on another side, the first end not intersecting the circumferential sipe and closed within the groove bottom, and the second end preferably closed within the groove bottom.
REFERENCES:
patent: 3789898 (1974-02-01), Montagne
patent: 4258769 (1981-03-01), Makino et al.
patent: 4296789 (1981-10-01), Roberts et al.
Maki Steven D.
Sumitomo Rubber Industries Ltd.
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