Abstract: The invention relates to a method and to an autonomous device (10d) for injecting a fluid (F), that uses pyrotechnical means (1d). The invention can be used in particular for injecting a protection fluid (F) into a system that is subject to overheating (8d). The method is characterized in that it uses a thermally triggered charge (1d).

Abstract: A vehicle is provided having an active bonnet and a pyrotechnic actuator configured to lift the active bonnet a plurality of times without having to perform maintenance on the pyrotechnic actuator. The pyrotechnic actuator includes a cylinder having an inlet opening, a first chamber and a second chamber that are separated by a central region; a piston that is configured to be displaced through the central region of the cylinder between a first position in the first chamber and a second position in the second chamber; and a carrier having first and second gas generators each being coupled to the inlet opening. The first gas generator is configured to be ignited to lift the active bonnet a first time, and the second gas generator is configured to be ignited independently of the first gas generator to lift the active bonnet a second time.

Abstract: The invention concerns a fastener-driving apparatus comprising a tank (8) for storage of a fuel, in particular a liquefied gas, a combustion chamber (4, 5) connected to the tank (8) via a valve element (9), where the combustion chamber (4, 5) has a movable piston (3) to advance a driving ram (2), and an ignition device for ignition of an air-fuel mixture in the combustion chamber, where an injection line (10, 11, 12) is provided between the tank (8) and the combustion chamber (4, 5), where the injection line (10, 11, 12) has optimization with regard to an expansion and/or transport time.

Abstract: This invention relates to controlling a tool for driving fastening elements through firing a fuel. A valve, upon each shot, opens via a current (IA) in a component created by a voltage injection control (Uv). Upon the first one of a series of shots and after the control, the time to is detected of a drop of current in a measuring member upon the transient rise of current and, the opening period To of the valve being predetermined, the end of the injection control is triggered at the time td, after a period To, following the time to, reduced with a period To, of a first rise of the voltage injection control following the beginning of the drop of current or a rise, following the beginning of its drop, of the current.

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

Abstract: A method and device for driving a linearly movable component, wherein a pressurized fluid is generated by feeding a given volume of oxygen into a combustion space connected to a piston/cylinder configuration and feeding a given volume of fuel into the combustion space for each motion stroke of the piston/cylinder configuration beore the start of the motion stroke, the given volume of oxygen is sufficient for the combustion of the fuel, the given volume of fuel is sufficient for generating the pressurized fluid, the oxygen and fuel are ignited in the combustion space, and the pressurized fluid is feed into the piston/cylinder configuration for driving a piston of the piston/cylinder configuration and a linearly movable component connected to the piston.

Abstract: A fastener driving tool powered by internal combustion of an air/fuel mixture. The tool body contains connected upper and lower coaxial cylinders. The upper cylinder is provided with a piston assembly and is connected by a one-way valve to a combustion air chamber. The lower cylinder contains a piston/driver assembly and is surrounded by and connected to a return air chamber. The upper cylinder piston assembly and the lower cylinder piston/driver assembly, when in their normal unactuated positions, define therebetween a combustion chamber provided with an ignition device.

Abstract: A detonating impact tool 10 has a manual recycler that works by manually pressing the tool and a fastener 25 against a work piece 51 to push a front housing 12 into a main housing 11 against a compression spring 30. This charges a detonation chamber 15 with a fuel and air mixture that is precompressed and detonated to drive a piston 20 and its impact rod 22 forward, driving the fastener into the work piece. On completion of its impact stroke, the piston clears an exhaust port 31, allowing exhaust gases to escape through an exhaust passageway 32. Following this, purging air rushes in through inlet 27 as the exhaust gases collapse; and as the tool is retracted from the work piece, pumping seal 26 draws purging, cooling, and recharging air into detonation chamber 15 as front housing 12 is returned to its forward position by the spring.

Abstract: Compression waves are formed by detonating a mixture of fuel and air confined within a chamber that has a constricted output opening. The mixture is ignited instantaneously throughout a peripheral region of the chamber opposite the output opening, and this region is shaped relative to the dimensions of the chamber and the output opening so that the burning of the mixture accelerates toward the output opening and inward from the peripheral region. This dynamically compresses and detonates the mixture to form a high pressure compression wave and direct it out of the output opening. The instantaneous ignition can be by plasma jets or flames injected into the ignition region from an ignition chamber adjacent to the detonation chamber. The device can directly transform the chemical energy of a fuel into a high pressure thrust directed against a relatively movable resistance to serve as a prime mover suitable for many tasks.

Abstract: An internal combustion apparatus is disclosed having a linear output. A metered quantity of gas fuel is transferred between a cylinder head and the disc of a plunger reciprocable in a principal chamber between top and bottom end of stroke positions. In the displacement of the plunger to its bottom end of stroke position air and fuel are intimately mixed in a one-way flow path around the disc including nonparallel and/or burred orifices in a perforate plate attached to the plunger. The fuel may be liquefied gas fuel in which case it may be vaporized by the combustion gases exhausted from the principal chamber to the surroundings through an annular exhaust zone coaxial of throttle passageways for carrying fuel from the metering piston to the principal chamber. Alternatively, a pressurized gas fuel may be used in which case the pressurized gas is utilized in the operation of the plunger.

Abstract: A log splitter which utilizes as the prime mover a one-cylinder internal combustion engine. The engine is a two-cycle engine, with the fuel-air mixture being manually supplied to the engine by way of a charging unit. The internal combustion engine is of a size to provide the desired impact striking of the log to be split, followed by the application of sufficient force to continue the splitting.

Abstract: Compression waves are formed by detonating a mixture of fuel and air confined within a chamber that has a constricted output opening. The mixture is ignited instantaneously throughout a peripheral region of the chamber opposite the output opening, and this region is shaped relative to the dimensions of the chamber and the output opening so that the burning of the mixture accelerates toward the output opening and inward from the peripheral region. This dynamically compresses and detonates the mixture to form a high pressure compression wave and direct it out of the output opening. The instantaneous ignition can be by plasma jets or flames injected into the ignition region from an ignition chamber adjacent to the detonation chamber. The device can directly transform the chemical energy of a fuel into a high pressure thrust directed against a relatively movable resistance to serve as a prime mover suitable for many tasks.

Abstract: A percussion apparatus, for example for driving nails or staples, having an auxiliary piston which when released thrusts a main operating piston to an intermediate position. The auxiliary piston transfers a metered quantity of gaseous fuel together with combustion supporting air to a space between the main piston and cylinder head separating the auxiliary piston cylinder from the main piston cylinder. The explosive mixture in the space is then ignited and the main piston is thrust in a first direction displacing a driver member and simultaneously the auxiliary piston is thrust in the opposite direction to its initial position where it is retained until released to start another operating cycle; the main piston automatically returns to its initial position as the combustion gases are exhausted to the atmosphere.

Abstract: A pile driving ram for driving piles into subaqueous ground, during which a heavy piston operating as a hammer is each time lifted by fuel explosion in a cylinder, comprises a considerable and expensive cylinder piece, which has inlet and outlet ports and which comprises at least two guide girdles for supporting guide members co-operating with at least one guide stay of a guide frame. In order to increase the lifetime of the cylinder piece, the core is moulded from precious steel according to the fling moulding method.

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.