Patent ID: 8397778

Claim:
A flat-running device intended for equipping a mounted assembly for a motor vehicle, which comprises a wheel rim with a plurality of blocks and a tire comprising beads mounted against flanges of the rim, the device comprising: an annular structure for supporting the tire, which is intended to be mounted around the rim and which is divided into at least two ring sectors in the form of an arc of a circle forming this structure by being juxtaposed in the circumferential direction, all the sectors being surmounted by a radially outer support casing which is intended for supporting the tire after an inflation pressure drop inside the mounted assembly and which comprises two lateral portions projecting axially on either side of the lateral faces of the structure and partially covering these faces, and means for locking the beads against said flanges, which connect the annular supporting structure to the beads, wherein said support casing incorporates in its lateral portions holding means for holding the ring sectors, which are capable of opposing the axial displacement of the sectors under lateral forces in the event of a shock during running in the inflated state or in the event of running flat, so that these sectors remain surmounted by the casing, the casing having an inner axial surface prolonged radially inward by two collar-shaped inner radial surfaces of the casing in contact with the sectors, the holding means being formed by at least one pair of circumferential reinforcing elements respectively located in two radially inner zones of said lateral portions, the diameter (D 1 ) of each pair of reinforcing elements being markedly smaller than the diameter (D 2 ) of said inner axial surface of the casing.