Abstract: A self-expanding and self-undercutting guard rail bolt includes a dowel having a guard rail fastening end and a ring. The fastening end is configured to be driven in rotation, and the ring is configured to rigidly connect to a first screwing end of the dowel by an incipient fracture portion. The self-expanding and self-undercutting guard rail bolt further includes a counter-dowel screwed to the dowel by a second screwing end. The counter-dowel includes an expansion cone, and an anti-rotation head having at least one edge which projects beyond a periphery of the dowel to prevent rotation of the counter-dowel about an axis of the guard rail bolt.

Abstract: The fastening apparatus for fastening elements includes a combustion chamber, a housing for a gas cartridge, means for injecting gas from a cartridge into the combustion chamber and a management module. An engine thermistor is provided to be subjected to the temperature of the chamber, as well as a second cartridge thermistor intended to be subjected to the temperature of the gas cartridge disposed in the cartridge housing. Both thermistors are mounted for transmitting their temperature information to the management module. The management module is operable for managing temperature information and determining the opening time of the injection means.

Abstract: A self-expanding and self-undercutting guard rail bolt includes a dowel having a guard rail fastening end and a ring. The fastening end is configured to be driven in rotation, and the ring is configured to rigidly connect to a first screwing end of the dowel by an incipient fracture portion. The self-expanding and self-undercutting guard rail bolt further includes a counter-dowel screwed to the dowel by a second screwing end. The counter-dowel includes an expansion cone, and an anti-rotation head having at least one edge which projects beyond a periphery of the dowel to prevent rotation of the counter-dowel about an axis of the guard rail bolt.

Abstract: The suspension plate is divided into a plurality of adjacent functional portions (2, 13, 24), including a fixing portion (2), the said portions each being separated from another by a bending zone (10, 15) to be folded back in pairs one towards the other. One of the bending zones (10) is weakened by at least one notch (11, 12) for reception of a flexible strand (25). The invention is applied, in particular, to the suspension of false ceilings.

Abstract: Combustion gas cartridge for a gas internal combustion fastening device, comprising an external casing over which is crimped the edge of an internal cup beyond which an outlet end projects. The external casing is stepped and includes three longitudinal zones having different respective diameters, namely a first edge zone, a second bearing zone for the head of a crimping machine having a smaller diameter than that of the edge zone and a third zone having a diameter equal to or greater than that of the edge zone and forming an annular shoulder together with the second bearing zone for the crimping head.

Abstract: The suspension plate is divided into a plurality of adjacent functional portions (2, 13, 24), including a fixing portion (2), the said portions each being separated from another by a bending zone (10, 15) to be folded back in pairs one towards the other. One of the bending zones (10) is weakened by at least one notch (11, 12) for reception of a flexible strand (25). The invention is applied, in particular, to the suspension of false ceilings.