Abstract: A fastener driving device comprising a pressure chamber, a first piston, a fastener channel and a second piston. The first piston is coupled to the pressure chamber such that pressurized gas in the pressure chamber causes the first piston to slide from a first position to a second position. The fastener channel is configured to receive a fastener, wherein when moving from the first position to the second position the first piston is configured to engage a fastener and drive it from the device. The second piston is slidable within a sleeve and arranged such that when the first piston slides from the first position to the second position the first piston drives the second piston and compresses gas within the sleeve. Compressed gas in the sleeve biases the first piston towards the first position.

Abstract: A portable electric device comprising a cylinder in which at least one movable piston slides between a start position corresponding to the top of the cylinder and an end position corresponding to the bottom of the cylinder, said piston comprising a mechanism configured to come into contact with an element to be operated once the piston is in the end position or is between the start position and the end position. More particularly, the portable electric device comprises: a power supply mechanism intended to supply power to a first fixed coil, the first fixed coil being positioned facing an expulsion mechanism for expelling the piston when the piston is in the start position, the expulsion mechanism being secured to a first face of the movable piston; and at least one braking mechanism for braking the piston that are configured to brake the piston when the piston is in the end position or approaching the end position.

Abstract: A portable electric device comprising a cylinder in which at least one movable piston slides between a start position and an end position, said piston comprising a mechanism configured to come into contact with an element to be operated once the piston is in the end position or is between the start position and the end position. More specifically, the portable electric device comprises: a power supply intended to supply power to a first fixed coil, the first fixed coil being positioned facing an expulsion mechanism for expelling the piston when the piston is in the start position, the expulsion mechanism being secured to a first face of the movable piston; and at least one braking mechanism for braking the piston that are configured to brake the piston when the piston is in the end position or approaching the end position.

Abstract: Gas-operated fixing tool including a working chamber, a piston mounted slideably in the working chamber and comprising a driving rod of which a first longitudinal end is configured to drive a fixing element and of which a second longitudinal end is connected to a head which separates the working chamber into a first portion and into a second portion which is traversed by the rod, and at least one combustion chamber in which a mixture of air and fuel is intended to be burnt in order that combustion gases generate a rise in pressure that causes a movement of the piston in the working chamber, wherein the at least one combustion chamber is in fluid communication with the second portion in such a way that the rise in pressure causes the movement and the return of the piston into a rest position ready for firing a fixing element.

Abstract: Gas-operated fixing tool including a working chamber, a piston mounted slideably in the working chamber and comprising a driving rod of which a first longitudinal end is configured to drive a fixing element and of which a second longitudinal end is connected to a head which separates the working chamber into a first portion and into a second portion which is traversed by the rod, and at least one combustion chamber in which a mixture of air and fuel is intended to be burnt in order that combustion gases generate a rise in pressure that causes a movement of the piston in the working chamber, wherein the at least one combustion chamber is in fluid communication with the second portion in such a way that the rise in pressure causes the movement and the return of the piston into a rest position ready for firing a fixing element.

Abstract: A combustion-powered fastener-driving tool that include a chamber member retainer assembly configured to enable the controller of the tool to prevent the chamber member of the tool from moving to an open unsealed position and to ensure the tool's combustion chamber remains sealed until the piston fully returns to its pre-firing position.

Abstract: A fastener driving device comprising a combustion chamber, a piston and a fastener channel. The piston is coupled to the combustion chamber and slidable within a sleeve such that combustion gas expansion in the combustion chamber causes the piston to slide from a first position to a second position. The fastener channel is configured to receive a fastener, wherein when moving from the first position to the second position the piston is configured to engage the fastener and drive it from the device. According to a first example the device further comprises a return chamber configured to receive gas from the sleeve via a first vent, and the device comprises a second vent coupled to the return chamber and configured to supply combustion gas from the combustion chamber to the return chamber.

Abstract: A fastener driving device comprising a pressure chamber, a first piston, a fastener channel and a second piston. The first piston is coupled to the pressure chamber such that pressurized gas in the pressure chamber causes the first piston to slide from a first position to a second position. The fastener channel is configured to receive a fastener, wherein when moving from the first position to the second position the first piston is configured to engage a fastener and drive it from the device. The second piston is slidable within a sleeve and arranged such that when the first piston slides from the first position to the second position the first piston drives the second piston and compresses gas within the sleeve. Compressed gas in the sleeve biases the first piston towards the first position.

Abstract: A combustion-powered fastener-driving tool that include a chamber member retainer assembly configured to enable the controller of the tool to prevent the chamber member of the tool from moving to an open unsealed position and to ensure the tool's combustion chamber remains sealed until the piston fully returns to its pre-firing position.

Abstract: A combustion-powered fastener-driving tool that include a chamber member retainer assembly configured to enable the controller of the tool to prevent the chamber member of the tool from moving to an open unsealed position and to ensure the tool's combustion chamber remains sealed until the piston fully returns to its pre-firing position.

Abstract: Gas-operated fixing tool including a working chamber, a piston mounted slideably in the working chamber and comprising a driving rod of which a first longitudinal end is configured to drive a fixing element and of which a second longitudinal end is connected to a head which separates the working chamber into a first portion and into a second portion which is traversed by the rod, and at least one combustion chamber in which a mixture of air and fuel is intended to be burnt in order that combustion gases generate a rise in pressure that causes a movement of the piston in the working chamber, wherein the at least one combustion chamber is in fluid communication with the second portion in such a way that the rise in pressure causes the movement and the return of the piston into a rest position ready for firing a fixing element.

Abstract: Control of a quantity of air introduced into an intake of a supercharged internal combustion engine which includes a proportional valve located in a partial transfer duct which controls flow of compressed air flow through the partial transfer duct into an inlet of a turbine. The proportional valve is controlled to move between open and closed positions in accordance with strategies in accordance with stabilized phases of operation of the engine. Characteristics of stabilized phases of operation of the engine are determined and are used to control circulation of the compressed air during transitions between the stabilized phases of engine operation in accordance with the determined characteristics of the stabilized phases of the engine operation. The determined characteristics are derived from a previously completed mapping of speed and charging of the supercharged engine during a previous stabilized phase.

Abstract: The present invention controls the amount of air fed to the intake of a supercharged internal-combustion engine. The engine includes two exhaust gas outlets (32, 36) each connected to an exhaust manifold (30, 34) of a group of at least one cylinder (121, 122, 123, 124), a turbocharger with a dual-inlet (46, 48) turbine (40) connected to the exhaust gas outlets, and to an outside air compressor (44), and a duct (64) for partial transfer of the compressed air from the compressor to the turbine inlets. Two branches (70, 72) of the partial transfer duct, are connected to the turbine inlets. Each branch carries proportional throttle (74, 76), and the compressed air circulation in the branches is controlled during transient operation phases according to strategies applied to the proportioned throttle valves and determined in accordance with the stabilized phase characteristics.

Abstract: Method for controlling the quantity of air introduced to the intake of a supercharged internal combustion engine, said engine comprising an exhaust gas outlet (32) connected to an exhaust collector (30), comprising a supercharging device (38) comprising a turbocompressor with a turbine (40) having a single inlet (46) connected to said exhaust gas outlet, and an external air compressor (44), and a duct (64) for the partial transfer of the compressed air from the compressor to the inlet of the turbine. According to the invention, a branch (70) is provided on said partial transfer duct, said branch being connected to the inlet of the turbine and comprising a proportional valve means (74), and in that the flow of the compressed air in this branch is controlled during transitory operating phases in accordance with strategies that are applied to said valve means and are determined according to characteristics of the stabilized phases.

Abstract: The present invention relates to a method of controlling the amount of air fed to the intake of a supercharged internal-combustion engine, said engine comprising two exhaust gas outlets (32, 36) connected each to an exhaust manifold (30, 34) of a group of at least one cylinder (121, 122, 123, 124), comprising a supercharging device (38) including a turbocharger with a dual-inlet (46, 48) turbine (40) connected to said exhaust gas outlets, as well as an outside air compressor (44), and a duct (64) for partial transfer of the compressed air from the compressor to the turbine inlets. According to the method, two branches (70, 72) are provided on said partial transfer duct, said branches being connected to the turbine inlets and carrying each proportional throttling means (74, 76), and the compressed air circulation in the branches is controlled during transient operation phases according to strategies applied to said throttling means and determined in accordance with the stabilized phase characteristics.