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Safety-pneumatic-tire

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Safety pneumatic tire

Details

Inventors: Hagenbohmer, Bodo; Schaefer, Philipp;
Assignee: Michelin Recherche et Technique (CH)
Primary Examiner: Hoffman; Drayton E.
Assistant Examiner:
Attorney, Agent or Firm: Brumbaugh, Graves, Donohue & Raymond

Tires are improved against puncture damage by at least partially filling the inside of the tire with hollow spheres which contain a gas and whose thin shell consists of synthetic material, these spheres having a diameter of between 0.01 and 0.04 mm. and a density of 0.005 to 0.25 g/cc., and/or by lining at least a portion of the surface of the inner wall of the tire with a strip of composite material of low density comprising a suspension of said hollow spheres in a mass of liquid or pasty synthetic material of low molecular weight.

DETAILED DESCRIPTION What is claimed is: 1.
In a tire having an inner wall defining a tire cavity and containing a filling material for plugging punctures, the improvement which comprises said filling material being a suspension of hollow spheres, said suspension comprising a gaseous continuous phase containing freely movable suspended hollow spheres having thin shells consisting of synthetic material, said hollow spheres containing a gas in the centers thereof and having a diameter of from 0.
01 to 0.
4 millimeters and a density of from 0.
005 to 0.
25 g.
/cc.
, said suspension at least partially filling the tire cavity.
2.
The tire defined by claim 1 wherein the shells of the hollow spheres consist of polyvinylidene chloride.
3.
The tire defined by claim 1 wherein the hollow spheres are covered with a lubricant.
4.
The tire defined by claim 1 wherein said suspension further contains freely movable solid particles of cellular material of very low apparent density.
5.
The tire defined by claim 4 wherein said solid particles of cellular material bear a lubricant having a low vapor pressure.
6.
The tire defined by claim 1 wherein said hollow spheres have a diameter of between 0.
02 to 0.
1 millimeters and a density of between 0.
015 and 0.
08 g.
/cc.
7.
In a tire having an inner wall defining a tire cavity and containing a filling material for plugging punctures, the improvement which comprises said filling material being a suspension of hollow spheres, said suspension comprising a liquid to pasty continuous phase of synthetic material of low molecular weight containing freely movable suspended hollow spheres having thin shells consisting of synthetic material, said hollow spheres containing a gas in the centers thereof and having a diameter of from 0.
01 to 0.
4 millimeters and a density of from 0.
005 to 0.
25 g.
/cc.
, said suspension being adhered on at least the portion of the inner wall of the tire below the tread.
8.
The tire defined by claim 7 wherein the shells of the hollow spheres consist of polyvinylidene chloride

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