Abstract: A run-flat device for a motor vehicle, the device being designed to be fitted clamped on a standard rim having lateral flanges for holding the beads of a tire, wherein the device is constituted by at least two coaxial annular pieces engaged one on the other, the radially-inner piece being of relatively rigid material and forming an open ring around the rim, the radially-outer piece being based on an elastically deformable material and comprising a one-piece continuous surrounding the radially-inner annular piece and having an inside diameter that is substantially equal to or greater than the outside diameter of a lateral flange of the rim.

Abstract: A filling for a puncture-proof pneumatic tire is formed by two half-toruses of elastomer or of rubber which are juxtaposed along an equatorial plane inside a tire cover and which are formed with a plurality of parallel channels of preferably hexagonal cross-section, the channels being parallel and separated from one another and positioned so that the thickness of material between adjacent channels is substantially constant.

Abstract: A device for controlling discharge from a pneumatic enclosure under pressure, in particular for controlling rapid deflation of a tire to a predetermined pressure value after the device has been assembled to a valve fitted to the enclosure, the device comprising a pushbutton for actuating a striker adapted to cooperate with the deflation pin of the valve and slidably mounted in a case which provides a chamber coaxially around the striker for the deflation pin, at least one vent hole being provided for exhausting the gaseous fluid contained in the enclosure to be deflated, and the striker being slidably mounted in a piston-washer received in said chamber and adapted to cooperate with the striker by a wedging action to hold the striker in a position that allows escape of the gaseous fluid contained in the enclosure.

Abstract: A pressure chamber or core for an unpuncturable pneumatic tire is constituted by a toroidal cushion of elastomer material including mutually independent gastight cells containing a gas under pressure. The cells are substantially all of the same right cross-section, and the area of the right cross-section of any one cell is a small fraction of the area of the right cross-section of the chamber.