Pneumatic tire and tread therefor having variable rolling contac

Details Pneumatic tire and tread therefor having variable rolling contac Pneumatic tire and tread therefor having variable rolling contac

1973-03-26

1976-04-13

Hoffman, Drayton E.

Resilient tires and wheels

Tires, resilient

Anti-skid devices

152361DM, 152361FP, B60C 1104, B60C 922

Patent

active

039497976

ABSTRACT:
A high speed pneumatic tire with a tread whose width of running contact with the ground is automatically variable. The tread consists of a central portion that is in constant contact over its entire width with the ground and two lateral shoulder portions which are respectively arranged on each side of the central portion and are each separated from the central portion by an essentially continuous circumferential groove that forms a flexible joint or coupling. Each lateral shoulder portion of the tread is radially contracted and inclined with respect to the central portion so that it contacts the ground where required by the dynamic forces on the tire, e.g., acceleration, turning and braking. The central and lateral shoulder portions of the tread each may have the same or different design patterns for particular purpose, e.g., snow, anti-skid. The tire may have a radial carcass and may also include a reinforcing breaker formed of continuous or discontinuous layers, the marginal edge portion of the breaker formed by the folding back of at least one of the layers.

REFERENCES:
patent: 3176748 (1965-04-01), Giebhart
patent: 3404721 (1968-10-01), Massoubre
patent: 3554261 (1971-01-01), Mirtain et al.
patent: 3559712 (1971-02-01), Verdier
patent: 3613763 (1971-10-01), Fletcher
patent: 3677319 (1972-07-01), Mirtain
patent: 3690364 (1972-09-01), Barassi et al.
patent: 3782438 (1974-01-01), Mirtain

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