Patent ID: 8833416
Filing Date: 2014-09-16
Classification: B60C,Y10T

Abstract:
1. An inner tube for an assembled unit, said tube having a closed polymeric envelope with a primary surface comprising a valve, said primary surface having at least three parts, each of the at least three parts having a curvilinear length in a meridian plane and having means allowing compression in at least the circumferential direction of said part of the polymeric envelope when inflated under normal conditions of use of the assembled unit, wherein the sum of said curvilinear lengths is greater than or equal to 36% of the total curvilinear length of said primary surface of the polymeric envelope in said meridian plane, and wherein the meridian curvature of each of said at least three parts is such that the ratio of the average radius of said meridian curvature to the radius of a circle of perimeter equal to the meridian perimeter of the primary surface of the polymeric envelope is greater than 2.5, when the inner tube is inflated to a pressure of 2000 pascals outside of the assembled unit.