Abstract: The invention relates to a triggered-stroke actuator (10) comprising a body (12) housing a piston (14) and a rod (16), and a gas generator (18) mounted in said body (12) opposite said piston (14) and capable of pressurising a first chamber (20) defined between said gas generator and said piston, in which the piston (14) comprises, on its external face, a groove (30) in which is housed a sealing joint (40) with the body (12) of the actuator (10). A calibrated passage (50), adapted to evacuate gas from the first chamber (20), is formed between the sealing joint (40) and the wall of the groove (30).

Abstract: The invention relates to an actuator comprising an actuator element movably supported at an actuator housing, a pyrotechnic pressure element to move the actuator element and a control means to control a force exerted onto the actuator element by the pressure element to move the actuator element.

Abstract: The technical field of the invention is that of pyrotechnic actuators including a piston and having the essential function of exerting thrust to move an object by causing the piston to emerge. The invention relates more particularly to a pyrotechnic gas generator (2), a combustion chamber (3), a piston (10) capable of moving in a slide chamber (4) under the effect of said gas, the two chambers (3, 4) being in communication with each other. The main characteristic of this actuator is that it comprises a shutter device (5) implemented after said actuator (1) has been triggered to interrupt the communication between said chambers (3, 4), said shutter device (5) being included in the slide chamber (4).

Abstract: The invention relates to a constant force pyrotechnic actuator comprising a pyrotechnic gas generator, a body, a piston capable of moving in the said body under the effect of the gases emitted by the generator, and a pressure regulator member situated inside the piston, the said piston having a front face traversed by a duct making it possible to place in communication the space separating the gas generator and the said piston, and an inner space in which the regulator member is housed. Within said actuator, the piston is extended by a hollow push rod terminating in an enlarged head, the said head having gas discharge ducts, and the inner space of the said rod is in communication with the inner space of the piston in which the regulator member is housed.

Abstract: A projectile for being propelled along a trajectory by propellant gases inside a launcher tube, the projectile including a casing, first pressure means for first pressurizing the casing without exploding the casing during firing of the projectile, and second pressure means for second pressurizing and exploding the casing, wherein the first pressure means includes part of propellant gases inside a launcher tube used to propel the projectile, or alternatively, gases generated by the first pressure means.

Abstract: The present invention relates to an accelerator plate that divides the combustion chamber of an internal combustion fastener driving tool.

Abstract: A linear drive for a belt tensioner comprises a pyrotechnic propellant charge, a cylinder tube and a piston displaceably arranged therein. The propellant charge, upon ignition, provides a pressurized gas acting on the piston. The piston has a hollow interior adapted to be subjected to the pressurized gas and an axial end at which an end wall is provided. The end wall has a bursting disc arranged facing the interior of the piston and a through opening formed by a stepped bore. The stepped bore has a first section facing the interior of the piston and is provided with an edge facing the interior, and a second section adjacent the first section. The second section has a diameter which is smaller than a diameter of the first section. The bursting disc abuts at the edge of the first section of the stepped bore.

Abstract: The invention that relates to a pyrotechnic actuator in which the movement of the piston is damped. The actuator includes a body, a piston, a pyrotechnic material combustion chamber and a counter pressure chamber. The actuator also includes at least one intermediate compression chamber located between the combustion chamber and the end of the piston, with the intermediate compression chamber connected to the combustion chamber by a hole.

Abstract: A high pressure power source for receipt on board a missile. The power source is passive until after the missile has been fired. The power source is in the form of a high pressure gas which is received in a combustion chamber of a pressure bottle. The energy from the gas is converted to electrical, pneumatic or hydraulic power as required on the missile thereby eliminating the need of electrical batteries on board the missile.

Abstract: Pyrotechnical driving device especially for a back-tightening device of a safety belt system with a cartridge containing a propellant charge, preferably a solid propellant charge. The cartridge is connected to a cylinder which contains a driving piston. The cartridge is separated from the piston by a rupture plate which is ruptured after the propellant charge is activated and after which the driving piston is accelerated. The rupture plate is followed directly by a form-stable nozzle plate which has a nozzle opening which is narrower as compared to the rupture plate.

Abstract: An operator in which a plurality of explosive propellant cartridges are received in individual chambers and may be rapidly fired one at a time in sequence. The cartridges are fired by an electric current sequentially directed to the cartridges by a distributor. The gas produced by the firing of each cartridge is admitted through control valving to a common receiver. The gas in the common receiver may act on a piston to actuate a device or it may be conveyed by a conduit to a device to actuate it.

Abstract: This striking tool of an internal combustion type includes in a housing of a tool body a cylinder providing slidably a piston connecting to a driver. A combustion chamber is disposed around the side wall of the cylinder. A fluid controlled valve is disposed between the combustion chamber disposed around the side wall of the cylinder. A fluid controlled valve is disposed between the combustion chamber and a piston upper chamber of the cylinder, which is normally biased to close communication between the combustion chamber and the piston upper chamber and operated to open communication therebetween when mixture gas of combustible gas and air in the combustion chamber is exploded therein. When a trigger, disposed on the external of the tool body and driveable outwardly, is driven, said mixture gas at first enters and fills up the combustion chamber and then is ignited therein by igniting means.

Abstract: The present invention is a projectile type demolition tool. A projectile with an enlarged upper cross-sectional area is slideably mounted within and extendable from an inner cylinder. The lower portion of the projectile is extendable through a guide connected to the bottom of the inner cylinder. Upon pressing a working end of the projectile against a work piece to be broken, the projectile recedes upward in the inner cylinder until the enlarged upper area moves above a source of low pressure gas connected through the inner cylinder. The low pressure gas continues to move the projectile upward in the inner cylinder to a cocked position. In the cocked position, a reduced area upper portion of the projectile acts against a moderately high pressure gas injected into a combustion chamber. Thereafter, a high pressure gas is created by an internal combustion in the combustion chamber, which high pressure gas drives the projectile downward into the work piece.