Nonreinforced tire
First Claim
1. In a nonreinforced inflated tire mounted on a wheel rim, said tire consisting of at least one elastic material and having a tread-forming crown extended on both sides by a sidewall terminating in a bead, each sidewall as seen in radial section having an outer wall and an inner wall and a median line which is the line of the centers of circles which are tangent both to said outer wall and to said inner wall, each circle being entirely included within said radial section, the improvement which comprises each sidewall has at least one sequence of zones A, B, C, D without interruption of continuity, formed of a zone C of substantially constant thickness, and, on opposite sides of the zone C, a zone B in which the thickness of the tire increases as it moves away from the zone C, the thickness of this zone B at its end opposite zone C being at least two times the thickness of the zone C, and a terminal zone D in which the thickness of the tire increases as it moves away from the zone C, the ratio of the increase in thickness of the zone D per unit of length of the median line being less than the ratio of increase in thickness of the zone B per unit of length of the median line, and finally a terminal zone A following the zone B and whose maximum thickness is equal to at least the greatest thickness of the zone B, said median line having a reversal of curvature which is located in a zone B.
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Accused Products
Abstract
Tire with a tread-forming crown extended on both sides by sidewalls terminating in a bead, said tire being made of elastic material and being free of reinforcement.
In accordance with the invention, each sidewall comprises at least one region in which the thickness varies and the median line of which has a curvature which changes sign, said tire being mounted on a rim and inflated.
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Citations
31 Claims
- 1. In a nonreinforced inflated tire mounted on a wheel rim, said tire consisting of at least one elastic material and having a tread-forming crown extended on both sides by a sidewall terminating in a bead, each sidewall as seen in radial section having an outer wall and an inner wall and a median line which is the line of the centers of circles which are tangent both to said outer wall and to said inner wall, each circle being entirely included within said radial section, the improvement which comprises each sidewall has at least one sequence of zones A, B, C, D without interruption of continuity, formed of a zone C of substantially constant thickness, and, on opposite sides of the zone C, a zone B in which the thickness of the tire increases as it moves away from the zone C, the thickness of this zone B at its end opposite zone C being at least two times the thickness of the zone C, and a terminal zone D in which the thickness of the tire increases as it moves away from the zone C, the ratio of the increase in thickness of the zone D per unit of length of the median line being less than the ratio of increase in thickness of the zone B per unit of length of the median line, and finally a terminal zone A following the zone B and whose maximum thickness is equal to at least the greatest thickness of the zone B, said median line having a reversal of curvature which is located in a zone B.
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11. In a nonreinforced inflated tire mounted on a wheel rim, said tire consisting of at least one elastic material and having a tread-forming crown extended on both sides by a sidewall terminating in a bead, each sidewall as seen in radial section having an outer wall and an inner wall and a median line which is the line of the centers of circles which are tangent both to said outer wall and to said inner wall, each circle being entirely included within said radial section, the improvement which comprises each sidewall has at least one sequence of zones A, B, C, D without interruption of continuity, formed of a zone C of substantially constant thickness, and, on opposite sides of the zone C, a zone B in which the thickness of the tire increases as it moves away from the zone C, the thickness of this zone B at its end opposite zone C being at least two times the thickness of the zone C, and a terminal zone D in which the thickness of the tire increases as it moves away from the zone C, the ratio of the increase in thickness of the zone D per unit of length of the median line being less than the ratio of increase in thickness of the zone B per unit of length of the median line, and finally a terminal zone A following the zone B and whose maximum thickness is equal to at least the greatest thickness of the zone B, said median line having a reversal of curvature which is located in a zone C in the vicinity of the junction between zones B and C.
- 12. In a nonreinforced inflated tire mounted on a wheel rim, said tire consisting of at least one elastic material and having a tread-forming crown extended on both sides by a sidewall terminating in a bead, each sidewall as seen in radial section having an outer wall and an inner wall and a median line which is the line of the centers of circles which are tangent both to said outer wall and to said inner wall, each circle being entirely included within said radial section, the improvement which comprises each sidewall has at least one assembly of two sequences of zones A, B, C, such As A1 --B1 --C1 and A2 --B2 --C2, without interruption of continuity, formed of a zone C of substantially constant thickness, a zone B joined to zone C in which the thickness of the tire increases as it moves away from the zone C, the thickness of this zone B at its end opposite zone C being at least two times the thickness of the zone C, and a terminal zone A following the zone B and whose maximum thickness is equal to at least the greatest thickness of the zone B, these two sequences of zones being connected to each other at their thinnest adjacent zones C1 and C2 so as to form a continuous assembly A1 --B1 --C1 --C2 --B2 --A2, said median line having at least one reversal of curvature which is located in a zone B.
Specification