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US 4,058,152 AGranted
Automobile safety tires
AssigneeBASF SE
InventorsGilbert Beck, Ludwig Zuern, Erhard Stahnecker
Life of this patent
Estimating the term…
Abstract
Tubeless automobile tires filled with foam, the foam used being closed-cell foamed particles of a partially crystalline olefin polymer of olefins of from 2 to 6 carbon atoms.
Claims4
A safety tire and wheel assembly including:
- an outer wheel rim;
- a tubeless tire seated about said rim;
- and substantially closed-cell, foamed, discrete particles of a partially crystalline polymer of an olefin of from 2 to 6 carbon atoms filling the space between said rim and the interior walls of said tire, said discrete particles having a final diameter of from 3 to 40 mm and a bulk density of from 10 to 100 g/1, said tire being under a gas pressure of from 0.1 to 5 atmospheres gage, said discrete particles further having a reduced size when initially placed within the tire and expanding thereafter under said gas pressure in said tire.
A safety tire and wheel assembly including:
- an outer wheel rim;
- a tubeless tire seated about said rim;
- and substantially closed-cell, foamed, discrete particles of a partially crystalline polymer of an olefin of from 2 to 6 carbon atoms filling the space between said rim and the interior walls of said tire, said discrete particles having a final diameter of from 3 to 40 mm and a bulk density of from 10 to 100 g/l, said tire being under a gas pressure of from 0.1 to 5 atmospheres gage, and said discrete particles being formed particles initially having less gas pressure in the closed cells than the gas pressure in the atmosphere surrounding said particles and thereby having been shrunken to from 25 to 75% of the volume of the particles when they are fully foamed, and said particles expanding by diffusion of gas into the cells under said 0.5 to 5 atmospheres gauge gas pressure of said tire and having virtually no inter-particulate channels between said particles.
Dependencies are inferred from the claim text.