Abstract: In a safety device for a motor vehicle, an air-bag is provided having a gas inlet to receive gas from a gas generator. One or more straps pass from a point on the bag spaced from the gas inlet to a fixed point. Apparatus are provided to release the strap in response to a predetermined signal from a sensor.

Abstract: A cover for an air-bag includes a laminate having an inner layer of polymer material and an outer layer of polymer material. Each layer defines a line of mechanical weakness, the line of mechanical weakness in the outer layer being laterally displaced by at least 2 millimeters relative to the line of mechanical weakness in the inner layer such that the inner layer do not overlie one another, the lines of mechanical weakness in the outer layer and in the inner layer together defining a door in the cover adapted to open when a predetermined pressure is provided from the air-bag, the lines of mechanical weakness in the outer layer and in the inner layer further being constituted by lines of reduced thickness.

Abstract: The inflatable safety cushion for a vehicle comprises an electric arming device (19) which is capable of detecting a dangerous situation and of very rapidly actuating a pyrotechnic gas generator for triggering said safety cushion, and which is powered by a cell (12). It also comprises an arming device (20, 21) for detecting that the vehicle is being used in order automatically to arm the device (19) as soon as it is detected that the vehicle is being used, and a device (21a) for interrupting the armed state as soon as, for a predetermined length of time, no use of the vehicle has been detected.

Abstract: A method of manufacturing a cold-gas pyrotechnic generator of the type having a casing including a base and a cover with an internal chamber accessed by a central opening for the reception of pyrotechnic elements includes the steps of placing the cover on the base with filtering material inserted, rotating the casing while introducing the pyrotechnic elements through the central opening and then inserting an ignition device in the central opening.

Abstract: The invention relates to a cold-gas pyrotechnic generator, in particular intended for automobile safety, as well as a method for manufacturing this generator.The generator according to the invention comprises a casing (2) of revolution consisting of a base (10) and a cover (20) establishing:a central channel (80) in which an ignition device is placed,an annular intermediate chamber (70) containing elements (40) of a gas-generating pyrotechnic composition,a peripheral annular chamber (60) containing a filter.A continuous lateral opening (71) is provided between the central channel (80) and the intermediate chamber (70).The method for manufacturing a generator of this type consists in assembling the cover (20) with the base (10) containing the filter by friction welding, in placing the casing (2) thus formed onto a lathe and in introducing, after setting in rotation, the pyrotechnic elements (40) into the chamber (70) through the opening (71) and, lastly, in installing the ignition device.